Page 1
ENGLISH
INSTRUCTION MANUAL
i
Page 2
CONTENTS
蠢 . EXPLANATION OF LK-1900A, COMPUTER-CONTROLLED
HIGH-SPEED BARTACKING MACHINE .................................................................... 1
[1] SPECIFICATIONS ..................................................................................................................................1
[2] CONFIGURATION ..................................................................................................................................2
1. Names of main unit .......................................................................................................................................... 2
2. Names and explanation of switches on the operation panel ....................................................................... 3
[3] INSTALLATION ...................................................................................................................................... 4
1. Installing the electrical box ............................................................................................................................. 4
2. Attaching the connecting rod ......................................................................................................................... 4
3. Installing the head support rod ...................................................................................................................... 4
4. Installing and connecting the power switch.................................................................................................. 5
5. Installation of the sewing machine head ....................................................................................................... 6
6. Installing the drain receiver and the head support rubber .......................................................................... 6
7. Safety switch .................................................................................................................................................... 7
8. Tilting the sewing machine head .................................................................................................................... 7
9. Installing the operation panel ......................................................................................................................... 8
10. Connecting the cord ........................................................................................................................................ 9
11. Installing the motor cover ............................................................................................................................. 10
12. Managing the cord ......................................................................................................................................... 11
13. Installing the eye protection cover ............................................................................................................... 11
14. Installing the thread stand ............................................................................................................................ 12
[4] OPERATION OF THE SEWING MACHINE .......................................................................................... 13
1. Lubrication ..................................................................................................................................................... 13
2. Attaching the needle ...................................................................................................................................... 13
3. Threading the machine head ........................................................................................................................ 14
4. Installing and removing the bobbin case .................................................................................................... 14
5. Installing the bobbin ...................................................................................................................................... 15
6. Adjusting the thread tension ........................................................................................................................ 15
7. Adjusting the thread take-up spring ............................................................................................................ 16
8. Example of the thread tension ...................................................................................................................... 17
[5] OPERATION OF THE SEWING MACHINE (BASIC) ...........................................................................16
1. Item data setting ............................................................................................................................................ 16
2. Checking the contour of a sewing pattern .................................................................................................. 19
3. Sewing ............................................................................................................................................................ 20
4. Change to the other sewing pattern ............................................................................................................. 20
5. Winding a bobbin ........................................................................................................................................... 21
6. Thread clamp device ..................................................................................................................................... 22
[6] OPERATION OF THE SEWING MACHINE (ADVANCED) .................................................................. 24
1. Performing sewing using the pattern keys ( , , , and ) ....................................................... 24
2. Performing sewing using the combination function .................................................................................. 27
3. Performing sewing using the “bobbin thread counter” ............................................................................. 29
4. How to use the temporary stop .................................................................................................................... 29
5. Setting the pattern thread tension ............................................................................................................... 30
6. Cautions in operation .................................................................................................................................... 31
[7] MAINTENANCE ................................................................................................................................... 31
1. Adjusting the height of the needle bar ........................................................................................................ 31
2. Adjusting the needle-to-shuttle relation ...................................................................................................... 32
3. Adjusting the lift of the work clamp foot ..................................................................................................... 33
4. The moving knife and counter knife............................................................................................................. 33
5. Needle thread clamp device .......................................................................................................................... 34
6. Adjustment of the wiper ................................................................................................................................ 34
7. Draining waste oil .......................................................................................................................................... 35
8. Amount of oil supplied to the hook .............................................................................................................. 35
9. Replacing the fuse ......................................................................................................................................... 35
10. Changing the voltage of 100/200V ................................................................................................................ 36
11. Replenishing the designated places with grease ....................................................................................... 37
[8] HOW TO USE THE MEMORY SWITCH ............................................................................................... 38
1. Start and change of the memory switch ...................................................................................................... 38
2. Example of the memory switch setting ....................................................................................................... 38
3. Table of functions of the memory switch .................................................................................................... 42
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[9] OTHERS ............................................................................................................................................... 45
1. Setting the DIP switch ................................................................................................................................... 45
2. Table of the standard pattern specifications ............................................................................................... 46
3. Table of the standard patterns ...................................................................................................................... 47
4. Table of the work clamp foot ......................................................................................................................... 49
5. LK-1900 data ROM ......................................................................................................................................... 51
6. Connection of the optional pedal ................................................................................................................. 51
7. Error list .......................................................................................................................................................... 52
8. Troubles and corrective measures (sewing conditions) ............................................................................ 55
9. Table of the optional parts ............................................................................................................................ 57
2. EXPLANATION OF THE LK-1901A, COMPUTER-CONTROLLED HIGH-SPEED
EYELET BUTTONHOLE BARTACKING MACHINE ................................................. 59
1. Specifications ................................................................................................................................................. 59
2. Installation of the sewing machine and preparation of the operation ...................................................... 59
3. Adjustment of the material closing amount ................................................................................................ 60
4. Adjustment of the lift of the work clamp foot .............................................................................................. 60
5. Adjustment of the pressure of the work clamp unit ................................................................................... 61
6. Setting of the material closing operation .................................................................................................... 61
7. Selection and confirmation of the sewing patterns .................................................................................... 62
3. EXPLANATION OF THE LK-1902A, COMPUTER-CONTROLLED HIGH-SPEED
BELT-LOOP ATTACHING MACHINE........................................................................ 63
1. Specifications ................................................................................................................................................. 63
2. Installation of the sewing machine and preparation of the operation ...................................................... 63
3. Threading the machine .................................................................................................................................. 63
4. Selection and confirmation of the sewing patterns .................................................................................... 64
5. Combination of the work clamp foot and the feed plate ............................................................................ 64
4. EXPLANATION OF THE LK-1903A, COMPUTER-CONTROLLED
HIGH-SPEED LOCKSTITCH BUTTON SEWING MACHINE ...................................65
1. Specifications ................................................................................................................................................. 65
2. Installation of the sewing machine and preparation of the operation ...................................................... 65
3. Needle and thread .......................................................................................................................................... 65
4. Various sewing modes .................................................................................................................................. 66
5. Position of the button clamp jaw lever ......................................................................................................... 67
6. Adjusting the feed plate ................................................................................................................................ 68
7. Adjusting the button clamp jaw lever .......................................................................................................... 68
8. Adjusting the lifting amount of the button clamp ....................................................................................... 69
9. Adjustment of the pressure of the work clamp unit ................................................................................... 69
10. Adjustment of the wiper spring .................................................................................................................... 70
11. Installing the save button bar (accessory part) .......................................................................................... 70
12. Model classification according to the button size ...................................................................................... 71
13. Attaching the shank botton (optional) ......................................................................................................... 72
5. DRAWING OF THE TABLE ...................................................................................... 76
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蠢 . EXPLANATION OF LK-1900A, COMPUTER-CONTROLLED HIGH-
SPEED BARTACKING MACHINE
[1] SPECIFICATIONS
1) Sewing area .................................................X (lateral) direction 40 mm Y (longitudinal) direction 30 mm
2) Max. sewing speed ...................................... * 3,000 rpm
(When sewing pitches are less than 5 mm in X-direction
and 3.5 mm in Y -direction.)
3) Stitch length ................................................. 0.1 to 10.0 mm (adjustable in 0.1 mm step)
4) Feed motion of work clamp foot ................... Intermittent feed (2-shaft drive by stepping motor)
5) Needle bar stroke ........................................ 41.2 mm
6) Needle.......................................................... DP x 5, DPx17
7) Lift of work clamp foot ..................................13 mm (standard) Max. 17 mm
8) Shuttle .......................................................... Standard semi-rotary hook (oil wick lubrication)
9) Lubricating oil ............................................... New Defrix Oil No. 2 (supplied by oiler)
10) Data recording ............................................. EE-PROM (128Kbyte) E-PROM (32kbyte)
11) Enlarging / Reducing facility ........................ 20% to 200% (1% step) in X direction and Y direction
respectively
12) Enlarging / Reducing method ...................... Pattern enlargement / reduction can be done by increasing/
decreasing the stitch length
13) Max. sewing speed limitation .......................400 to * 3,000 rpm (100 rpm steps)
14) Pattern selection .......................................... Specifying pattern No. type (1 to 200)
15) Bobbin thread counter ................................. UP/DOWN type (0 to 9999)
16) Sewing machine motor ................................ Servo motor
17) Dimensions .................................................. W : 1,200 mm L : 660 mm H : 1,100 mm
(Use the standard table and stand.)
18) Weight .......................................................... Machine head 42 kg, Control box 16.5 kg
19) Power consumption ..................................... 320 W
20) Operating temperature range ...................... 5 ˚C to 35 ˚C
21) Operating humidity range ............................ 35% to 85% (No dew condensation)
22) Line voltage ................................................. Rated voltage ± 10% 50/60 HZ
23) Noise ............................................................ Workplace-related noise at sewing speed
n = 3,000 min–1 : LPA ≦ 84 dB(A)
Noise measurement according to DIN 45635-48-A-1.
* Reduce the max. sewing speed in accordance with the sewing conditions.
* Max. sewing speed of LK-1900AWS (double capacity hook) is 2,700 rpm.
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Page 5
[2] CONFIGURATION
1. Names of main unit
w
q
e
r
qMachine head
wWork clamp feet
eThread stand
rOperation panel
tPower switch
yControl box
uPedal switch
u
t
y
− 2 −
Page 6
2. Names and explanation of switches on the operation panel
w
u
i
q
re
t
y
o
!0!1
q “Ready” key
This key changes over the setting state from the
panel to the sewing state where the sewing
machine actually operates.
w Sewing LED
This LED goes off at the time of setting state and
lights up at the time of sewing state. Changeover
can be performed with “Ready” key.
e “Reset” key
This key is used for canceling error or returning
the set value to the initial value.
r “Mode” key
This key makes the setting mode of the memory
switch.
t “+/Feed forward” key and “-/Feed backward” key
This key is used for changing pattern No. and X/Y
scale, and feed forward/feed backward.
y “Selection” key
This key selects the item to be set. Item selection
LED of the selected item and the set value are
displayed.
u Data indication LED
This LED indicates the set values of the selected
items such as pattern No., X/Y scale, etc.
i Item selection LED
LEDs of the selected items light up.
Pattern No.
Max. speed
limitation
Work clamp
foot lowering
X scale Y scale
Sewing
counter
Thread
tension
Bobbin
winder
o Needle thread clamp ON/OFF key
This key selects effective/ineffective of needle
thread clamp. When it is effective, needle thread
clamp display LED lights up. (Note 1)
!0 Needle thread clamp display LED
When this LED lights up, needle thread clamp
operates.
!1 Needle thread clamp display LED
This key registers the pattern. When this key is
pressed, the pattern registered here can sew
immediately.
X/Y scale, sewing position, etc. can be changed
and registered.
(Note 1) LK-1903A is set to needle thread clamp prohibited (no motion) with memory switch No. 35 at
the time of standard delivery.
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Page 7
[3] INSTALLATION
1. Installing the electrical box
t
y
u
q
2. Attaching the connecting rod
e
Install the electrical box on the underside of the table
at the location illustrated using round-head bolt q, plain
washer w, spring washer e and nut r supplied with
the machine, and using bolt having hexagonal
indentation on the head t, spring washer y and plain
washer u supplied with the machine.
w
e
r
1) Fix connecting rod q to installing hole B of pedal
lever w with nut e.
2) when connecting rod q is installed in installing hole
A, the depressing stroke of the pedal is increased.
w
A
q
B
3. Installing the head support rod
q
w
Drive head support rod q in hole w in the machine
table.
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Page 8
4. Installing and connecting the power switch
(1) Installing the power switch
笳
笊
笆
(2) Connecting the power source cord
Voltage specifications at the time of delivery from the factry are indicated on the voltage indication seal.
Connect the cord in accordance with the specifications.
Voltage caution seal
Fix power switch 笊 under the machine table with wood
screws 笆 .
Fix the cable with staples 笳 supplied with the machine
as accessories in accordance with the forms of use.
* Five staples 笳 including the staple for fixing the
operation panel cable are supplied as accessories.
1. Never use under the wrong voltage
and phase.
2. When changing the voltage, refer to
the item of "Changing the voltage
of 100 / 200V" (P.36).
Voltage indication seal (3-phase type only)
Rating label
• Connecting single phase 200V, 220V, 230V and 240V
Light blue
Table
Control box
Green/Yellow
Brown
Light blue
Brown
Green/Yellow
Plug
Power switch
• Connecting three phase 200V, 220V and 240V
Table
Control box
Green/Yellow
Black
White
Red
Black
White
Green/Yellow
Plug
Red
Power source cord
Brown
Light
blue
Green/
Yellow
White
Black
Red
Green/
Yellow
AC200 V
AC220 V
AC230 V
AC240 V
GND
AC200 V
AC220 V
AC240 V
GND
Power switch
Power source cord
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Page 9
5. Installation of the sewing machine head
WARNING :
To prevent possible accidents caused by the full of the sewing machine, perform the work by two persons
or more when the machine is moved.
A
A
q
q
1) Fit hinge rubber q to the hinge shaft ,and fix the
sewing machine main unit.
2) When tightening nut e to hinge rubber q, tighten
nut e until spring washer w becomes as B in the
illustration, and fix it with nut r.
If tightening hinge rubber q excessively, it
will not work properly. So, be careful.
Hold section A when moving the sewing
machine.
w
r
w
e
r
e
e
w
r
6. Installing the drain receiver and the head support rubber
e
w
1) Fix drain receiver w in the installing hole of table
q with four setscrews e.
2) Screw in drain bin r to drain receiver w.
3) Insert sewing machine drain pipe t into drain bin
r.
4) Insert head support rubber y into table q.
1. Insert drain pipe t until it will go no
further so that it does not come off
drain bin r when tilting the machine
head.
2. Remove the tape fixing drain pipe t.
w
w
A
B
q
t
y
y
r
− 6 −
Page 10
7. Safety switch
q
w
Remove tape q fixing the lever section of safety switch w.
1. When using the safety switch without removing tape q, it is very dangerous since the
Impor tant
sewing machine works even in the state that it is tillted.
2. In case error 302 occurs when the sewing machine works after setup, loosen the safety
switch fitting screw with a screwdriver, and lower the switchto the downside of the sewing
machine.
w
8. Tilting the sewing machine head
WARNING :
Tilt/raise the sewing machine head with both hands taking care not to allow your fingers to be caught in
the head. Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start
of the sewing machine.
w
q
When tilting the sewing machine head, tilt the head
gently until it comes in contact with head support rod
q.
1. Before tilting the sewing machine head,
make sure that head support rod qis
attached to the machine table.
2. When raising the sewing machine
head, do not raise it while holding
motor cover w. It will be the cause of
breakage of motor cover w.
3. Be sure to tilt the sewing machine head
on a flat place to prevent it from falling.
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Page 11
9. Installing the operation panel
w
q
e
q
r
Fix operation panel installing plate q on the machine
table with wood screws w and pass the cable through
hole r in the machine table.
Fix the operation panel on panel installing plate q with
screws e supplied as accessories.
Fix the cable on the bottom surface of the table with
the staples supplied with the machine as accessories.
Refer to the figure on the left side when installing the
panel under the table.
e
w
− 8 −
Page 12
10. Connecting the cord
Slowly
q
Remove four screws E fixing the rear cover of the
electrical box. When opening the rear cover, pressing
it with your hands, slowly open it by approximately 90˚
until it stops as illustrated.
Be sure to lend your hand to the rear cover
in order not to let the rear cover fall. In
addition, do not apply force to the rear
cover opened.
CN16 White
CN16
CN14
CN39
CN42
CN43
CN44
CN45
CN40
CN47
(LK-1901A)
CN38
CN34
CN14 White
4P
9P
2P
6P
6P
6P
6P
4P
2P
16P
26P
White
White
Yellow
White
Blue
Red
Yellow
White
White
Gray
Gray
Sewing machine head
Operation panel
Earth cord
CN34 Gray
CN45
Yellow
CN47
White
CN40
White
CN38 Gray
CN44 Red
CN39 Yellow
CN43 Blue
CN42 White
− 9 −
Page 13
w
1) Take care so that the cord is not caught between
the rear cover and the electrical box main body,
close the rear cover while pressing section A on
the lower side of the rear cover, and tighten four
C
screws q.
2) Lower downward the cord located on the side of
the control box and cord presser plate C in the push
B
q
A
hole B, press the cord and tighten screws w.
How to lock the cord clamp
q
qLightly press the corner of clamp.
(Cord clamp is locked with a click.)
11. Installing the motor cover
q
w
Clamp
q
How to remove the cord clamp
q Lightly pressing
w Pull down the clamp.
e The clamp goes up.
q
e
q
w
Install motor cover q on the machine main unit with
screws supplied with the machine as accessories.
− 10 −
Page 14
12. Managing the cord
w
q
Slack
1) In the state that the sewing machine is tilted, connect the cords, and bundle them with clip band q as
shown in the figure.
2) Fix the cords with cords setting plate w in the state that the cords slacken as shown in the figure.
When you tilt the sewing machine, make sure that the sewing machine head support bar is
placed on the table.
13. Installing the eye protection cover
WARNING :
Be sure to attach this cover to protect the eyes from the disperse of needle breakage.
Be sure to install and use eye protection cover q.
q
− 11 −
Page 15
14. Installing the thread stand
w
q
1) Assemble the thread stand unit, and insert it in the
hole in the machine table.
2) Tighten locknut q to fix the thread stand.
3) For ceiling wiring, pass the power cord through
spool rest rod w.
− 12 −
Page 16
[4] OPERATION OF THE SEWING MACHINE
1. Lubrication
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Check that the place between lower line B and upper
line A is filled with oil. Fill there with oil using the oiler
supplied with the machine as accessories when oil is
short.
* The oil tank which is filled with oil is only for
lubricating to the hook portion. It is possible to
reduce the oil amount when the number of rotation
used is low and the oil amount in the hook portion
A
B
is excessive. (Refer to 8. Amount of oil supplied to
the hook of [7] MAINTENANCE.)
1. Do not lubricate to the places other
2. When using the sewing machine for the
than the oil tank and the hook of
Caution 2 below. Trouble of
components will be caused.
first time or after an extended period
of disuse, use the machine after
lubricating a small amount of oil to the
hook portion. (Refer to 2. Adjusting the
needle-to-shuttle relation of [7]
MAINTENANCE.)
2. Attaching the needle
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
笆
絽
笳
綏
笊
Loosen setscrew 笊 and hold needle 笆 with the long
groove facing toward you. Then fully insert it into the
hole in the needle bar, and tighten setscrew 笊 .
If the stitches are made as shown in 綏 ,
attach the needle facing to the direction
絽 to a small extent.
− 13 −
Page 17
3. Threading the machine head
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
w
q
Thin synthetic thread or the like
Pull out the thread by approximately 4 cm from the needle after threading through the needle.
1. When the silicon oil is used, thread through thread guide for silicon q (Optional)
2. For thick thread, pass the thread through one hole only of needle bar thread guide w.
4. Installing and removing the bobbin case
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
1) Open hook cover q.
e
w
q
2) Raise latch e of bobbin case w, and remove the
bobbin case.
3) When installing the bobbin case, fully insert it into
the shuttle shaft, and close the latch.
If it is not fully inserted, bobbin case w
may slip off during sewing.
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Page 18
5. Installing the bobbin
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
e
2.5 cm
r
q
w
t
1) Set the bobbin q into bobbin case w in the direction
shown in the figure.
2) Pass the thread through thread slit e of bobbin
case w, and pull the thread as it is. By so doing,
the thread will pass under the tension spring and
be pulled out from thread hole r.
3) Pass the thread through thread hole t of the horn
section, and pull out the thread by 2.5 cm from the
thread hole.
If the bobbin is installed in the bobbin
case orienting the reverse direction, the
bobbin thread pulling out will result in an
inconsistent state.
6. Adjusting the thread tension
q
Long
Short
Adjusting the needle thread tension
h
If thread tension controller No. 1 q is turned clockwise,
the length of remaining thread on the needle after
thread trimming will be shorter. If it is turned
counterclockwise, the length will be longer.
Shorten the length to an extent that the thread is not
w
slipped off.
Adjust needle thread tension from the operation panel
and bobbin thread tension with w.
1) Select thread tension with key.
2) Set needle thread tension with key or
key. There is a setting range of 0 to 200. When the
set value is increased, the tension becomes higher.
*The tension is set so that 1.5 N (spun thread
#50) is obtained at the set value 50 at the time
of standard delivery. (When thread tension No.
1 is released)
− 15 −
Page 19
7. Adjusting the thread take-up spring
笊
笘
笳
笆
8. Example of the thread tension
The standard stroke of thread take-up spring 笊 is 8 to
10 mm, and the pressure at the start is 0.1 to 0.3N.
1) Adjusting the stroke
Loosen setscrew 笆, and turn thread tension asm.
笳 .
Turning it clockwise will increase the moving
amount and the thread drawing amount will
increase.
2) Adjusting the pressure
To change the pressure of the thread take-up
spring, insert a thin screwdriver into the slot of
thread tension post 笘 while screw 笆 is tightened,
and turn it. Turning it clockwise will increase the
pressure of the thread take-up spring. Turning it
counterclockwise will decrease the pressure.
When using the sewing machine for the first time, adjust the thread tension referring to the table below.
Thread
Polyester filament thread #50
Polyester spun thread #50
Polyester spun thread #60
(Thread clamp OFF)
Cotton thread #50
Cotton thread #20
Material
Wool
Wool
T/C broad
Denim
Denim
Needle thread
tension setting
30 to 35
50 to 55
30 to 35
35 to 45
35 to 45
Thread take-up spring moving
amount [Thread drawing amount]
10mm [13mm]
10mm [13mm]
8 to 10mm [11 to 13mm]
10mm [13mm]
8 to 10mm [11 to 13mm]
Strength
0.1N
0.2N
0.1N
0.1N
0.1N
− 16 −
Page 20
[5] OPERATION OF THE SEWING MACHINE (BASIC)
1. Item data setting
Set each item following the procedure described below.
Setting of the
pattern No.
e
Setting of the
X scale
e
Setting of the
Y scale
ee
Setting of the
max. sewing
speed limitation
(1) Turn ON the power switch.
Pattern No. of the item selection lights up, and the pattern No. is indicated on the data display.
(2) Setting of the pattern No.
1) Press the key to indicate the item “Pattern
NO” .
2) Press the or key to indicate “ 14 ”on
the display. (Pattern No. is set to 14.)
h
Refer the pattern No. to the separate table.
(3) Setting of the X scale
1) Press the key to indicate the item “X Scale”
.
2) Press the or key to indicate “100”. (Set
X scale to 100%.)
Setting the
thread tension
h
(4) Setting of the Y scale
h
The setting exceeding 100% is dangerous
since needle and the cloth presser
interferes with each other and needle
breakage or the like will occur.
1) Press the key to indicate the item “Y Scale”
.
2) Press the or key to indicate “100”. (Set
Y scale to 100%.)
The setting exceeding 100% is dangerous
since needle and the cloth presser
interferes with each other and needle
breakage or the like will occur.
− 17 −
Page 21
(5) Setting of the max. sewing speed limitation
1) Press the key to indicate the item “Speed”
2) Press or key to indicate “400”. (Setting
h
(6) Setting the thread tension
1) Press key to indicate the item “THREAD
2) Press or key to indicate “50”. (0 to
h
.
of 400 rpm)
TENSION” .
200 can be set.)
(7) Finish of setting
1) Press the key.
2) After the work clamp feet have moved and gone
up, the sewing LED lights up, and the sewing is
e
* When key is pressed, the set values of pattern No., X/Y scale, etc. are memorized.
* If key is pressed, you can make sure of the respective setting items again. However, the items can
not be changed in the state that the SEWING LED is lit up.
* When key is pressed, the READY LED goes off. Set values of the respective items can be changed.
* Thread tension can be changed even when the sewing LED lights up. Thread tension can be momorized
with the start switch as well.
* Use the machine after confirming the pattern No. When key is pressed while pattern No. is indicated
"0" (state at the time of delivery), error display E-10 appears. At this time, re-set the pattern No.
Impor tant
When turning OFF the power without pressing key, the set values of pattern No., X/Y
scale, number of max. rotation, and thread tension are not memorized.
ready.
When the presser is raised, be careful that
fingers are not caught in the presser since
the presser moves after having lowered.
− 18 −
Page 22
2. Checking the contour of a sewing pattern
WARNING :
1. Make sure without fail of the contour of the sewing pattern after selection of the sewing pattern. If
the sewing pattern extends outside the work clamp feet, the needle will interfere with the work clamp
feet during sewing, causing dangerous troubles including needle breakage.
2. When making sure of the contour of the sewing pattern, press + / - key with the needle bar lowered,
and the work clamp feet move after automatically making the needle bar return to the upper position.
1)
2) Select the work clamp foot lowering with
3) Lower the work clamp feet with the foot switch.
h
4) Press key in the state that the work clamp
Press key to make the READY LED light up.
key.
The sewing machine does not start
Reference
feet are lowered.
even when the foot switch is
depressed under this mode.
笆
10mm
h
d
Clearance
笊
Needle
The work clamp feet do not go up even
Reference
5) Confirm the contour of the pattern with key
or key.
6) The work clamp feet will go up when key is
pressed.
(Caution) When using a sewing pattern which is
when the foot switch is detached.
The work clamp feet do not come down
immediately after turning ON the power.
full in lengthwise direction (+10 mm),
make sure of the clearance between
cloth feed base 笆 and wiper base 笊. If
there is no clearance, loosen setscrew
笳 and move the wiper to the needle
side. Especially when the needle
position comes to the rear on the right
side, the clearance is decreased.
笊
笳
Clearance
笆
− 19 −
Page 23
3. Sewing
/
a
/
4. Change to the other sewing pattern
//
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1) Set a workpiece on the work clamp foot section.
2) Depress the pedal switch to the first step, and the
work clamp feet will come down. If you detach your
foot from the pedal switch, the work clamp feet will
go up.
3) Depress the pedal switch to the second step after
descending the work clamp feet at the first step,
and the sewing machine will start sewing.
4) After the sewing machine completes sewing, the
work clamp feet will go up, and return to the sewing
start position.
1) Make the Sewing LED go off with key.
2) Press key and select the item of pattern No
.
3) Set the pattern No. with key or key
4) Similarly, setting of X/Y scale, speed, etc. is
performed.
5) When key is pressed, the Sewing LED lights
up and the sewing machine is in the sewing ready
state.
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WARNING :
Make sure without fail of the contour of the sewing pattern after selection of the sewing pattern.
If the sewing pattern extends outside the work clamp feet, the needle will interfere with the work clamp
feet during sewing, causing dangerous troubles including needle breakage.
− 20 −
Page 24
5. Winding a bobbin
5-1. To wind a bobbin while the sewing machine is performing sewing
Thread the bobbin winder and wind the bobbin thread
onto the bobbin as illustrated in the figure.
5-2. To wind a bobbin independently
1) Press key to make the SEWING LED go
off.
2) Select the bobbin winder with key.
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Selection cannot be performed when the
Sewing LED is lit up.
3) Press key. The work clamp feet come down
and the Sewing LED lights up.
4) When the pedal switch is depressed, the sewing
machine rotates.
5) When the pedal is depressed again, or key or
key is pressed, the sewing machine stops.
6) When key is pressed, the Sewing LED goes
off, the work clamp feet go up and key
becomes effective.
Bobbin winder does not work immediately
after turning ON the power. Perform the
bobbin winding after setting pattern No.
or the like once, pressing the key,
and making the sewing LED light up.
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− 21 −
Page 25
6. Thread clamp device
Trouble of sewing (slip-off of needle thread, stitch skipping, or stain of needle thread) at the time of highspeed start can be prevented with the thread clamp device. The thread clamp device works in the state that
the thread clamp indication LED lights up and does not work when the LED goes off. Changeover of ON/
OFF motion is performed with key. When the thread clamp device is OFF, the start automatically
becomes the slow start.
1. When memory switch No. 35 is "1" (prohibited), the thread clamp does not work. In
addition, key is ineffective.
2. Memory switch, refer to [8] HOW TO USE THE MEMORY SWITCH.
* Matters that demand special attention when using the needle thread clamp device
(1) In case of with the needle thread clamp (motion), make shorter the length of needle thread remaining on the
needle at the sewing start for use. When the length of needle thread is lengthened, needle thread on the
wrong side of material is apt to protrude. In addition, when the length is excessively lengthened, the end of
needle thread held by the needle thread clamp may be rolled in the seams.
1)
33 to 36mm
3)
1) In case of with the needle thread clamp, the
standard of the length of needle thread is 33 to 36
mm.
2) When needle thread is long after replacing thread
or the like or sewing while holding needle thread
by hand, turn OFF the THREAD CLAMP key.
3) When the needle thread held with the thread clamp
is rolled in the seams, do not draw the material
forcibly and cut the connecting needle thread with
the scissors or the like. The seams are not
damaged since it is the needle thread at the sewing
start.
(2) It is possible to adjust needle thread shorter by making the needle thread clamp work while holding the
stabilized sewing at the start of sewing and the gathering (bird's nest) of needle thread on the wrong side of
material can be lessened. However, for the pattern which the stitch length for neatly rolling in needle thread
is short, needle thread may protrude from the wrong side of material. Select with/without thread clamp
referring to the item below.
1) When the sewing length is short (less than
(Right side)
approximately 10 mm), the end of needle thread
may protrude like beard even when adjusting
needle thread shorter.
10mm
(Wrong side)
Needle thread
− 22 −
Page 26
(3) When the type of lower plate 笊 that material does not come in close contact with throat plate 笆 is used,
needle thread on the wrong side of material may be rolled in the seams regardless of needle thread play or
sewing length.
(Wrong side)
笊
笆
Needle thread
(4) For LK-1903A (button sewing), the thread clamp is set to the motion prohibited in the state of standard
delivery due to the aforementioned (2) and (3). For (memory switch No. 35) with cross-over stitch ( , etc.)
or X shape ( , etc.), needle thread on the wrong side of material becomes easy to be rolled in. In this
case, it is recommended to use the thread clamp.
(5) When the thread clamp is used, and bobbin thread at the sewing start appears on the right side of material,
reduce thread tension at the sewing start (2 to 3 stitches) and bobbin thread becomes less conspicuous.
[Example of setting] Tension of 1 to 2 stiitches at the sewing start is “20” when sewing tension setting is “35”.
* For the setting of tension at the sewing start, refer to 5. Setting the pattern thread tension of [6] OPERATION
OF THE SEWING MACHINE (ADVANCED).
− 23 −
Page 27
[6] OPERATION OF THE SEWING MACHINE (ADVANCED)
1. Performing sewing using the pattern keys ( , , , and )
Patterns (No.1 to 200) which have been already registered can be registered to P1 to P50. It is possible to
change and register the scale, max. speed limitation, thread tension and sewing position. Same as the
patterns (No.1 to 200), P1 to P50 are used by the selection by scrolling the pattern Nos. The pattern calling
from P1 to P25 can be made by one-touch as well.
* When selecting P6 to P25, perform the selection by combination (simultaneous pressing) of , ,
, and keys as shown in the table below.
P-No. Selection key P-No. Selection key P-No. Selection key P-No. Selection key
P1 P1 P8 P1+P4 P15 P4+P5 P22 P2+P3+P4
P2 P2 P9 P1+P5 P16 P1+P2+P3 P23 P2+P3+P5
P3 P3 P10 P2+P3 P17 P1+P2+P4 P24 P2+P4+P5
P4 P4 P11 P2+P4 P18 P1+P2+P5 P25 P3+P4+P5
P5 P5 P12 P2+P5 P19 P1+P3+P4
P6 P1+P2 P13 P3+P4 P20 P1+P3+P5
P7 P1+P3 P14 P3+P5 P21 P1+P4+P5
(1) Register to the pattern key
Setting example : Register following setting to the P2., Pattern No. 3, X scale rate : 50%, Y Scale rate : 80%,
Max. speed limitation : 2,000 rpm, Thread tension : "50", Pattern position : 0.5 mm to the
right and 1 mm to the front
1) Turn ON the power switch and press key
to enter mode setting (memory switch setting).
(Sewing LED should be put out.)
2) Indicate the pattern register mode with
or key.
3) Press key.
Enter the pattern register mode.
4) Press key. (Select P-No. to be registered.)
Selection can be performed with or
key.
5) Press key to indicate the Pattern No .
Set the Pattern No. to "3" with or
key.
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Page 28
6) Press key and set as follows with
or key.
X Scale rate : “50”%, Y Scale rate :
“80”%, Max. speed limitation : “2000” rpm,
Thread tension : “50”
7) Press key and “X Scale rate ”
indication becomes 0.0. Traveling amount in X
e
direction can be set in 0.1 mm unit. Set 0.5 with
or key.
8) Press key and “Y Scale rate ”
indication becomes 0.0. Traveling amount in Y
e
direction can be set in 0.1 mm unit. Set –1.0
with or key.
9) Press key to finalize the setting.
e
10) Press key.
Pattern register mode is finalized.
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11) Press key.
Mode setting is finalized and the mode returns to the normal mode.
− 25 −
Page 29
(2) Sewing operation
Operation example : After performing sewing with the contents of the registered P2, perform sewing with
the contents of P3.
1) Turn ON the power switch.
2) Press the key.
3) Press the key, and when the sewing LED
lights up, the work clamp foot goes up after it has
moved.
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4) Check the contour of the sewing pattern.
(Refer to the item “Checking the contour of a sewing
pattern”.)
5) If the contour of the sewing pattern is acceptable,
the sewing can be made.
6) Press key after completion of sewing and the
presser comes down. The presser moves to the
sewing start point after origin retrieval and goes
up. (The P keys can operate the pattern chage by
one-touch even when the sewing LED is lighting
up.)
7) Perform the above items 4) and 5).
⇔
d
* The P1 to P25 can be indicated on the display when
selecting the pattern by pressing the or
key.
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⇔
/ 0 to 99 ,/ P1 to 25 ,
P1 to P25 which have not been registered are not
indicated.
Press P1 to P25 key while the sewing LED
lights up and the presser comes down.
Be careful that your fingers are not caught
in the presser.
Pattern register from P26 to P50 can be
performed. Register can not be performed
in to key. Designate the pattern
Reference
by the pattern selection only. Indicate the
pattern with or key.
/ 0 to 99 ,/ P1 to P25 ,/ P26 to P50 ,
Pattern selection from P26 to P50 cannot
be performed while the sewing LED lights
up.
− 26 −
Page 30
2. Performing sewing using the combination function
By arranging in the order of use of the pattern register (P1 to P50) which have been already registered and
registering in C1 to C20, the sewing pattern will change in the order every time the sewing machine finishes
the sewing. Every one combination No. can be registered up to the maximum 30 patterns.
(1) Register of the combination
Setting example : Combine in the order of P1, P2 and P3, and register them in the C1.
1) Turn ON the power switch and press key
to enter the mode setting (memory switch
setting). (Sewing LED should be put out.)
2) Indicate the combination mode with or
key.
3) Press key. Sewing LED lights up to enter
the combination mode.
C1 to C20 can be selected with or
key.
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4) Press key, and then press key.
P1 is set to the first pattern of C1. P1 to P50
can be selected with or key as well.
5) Press key, and then press key.
P2 is set to the second pattern of C1. P1 to P50
can be selected with or key as well.
6) Press key, and then press key.
P3 is set to the third pattern of C1. P1 to P50
can be selected with or key as well.
7) Press key to finalize the register.
8) Press key.
Combination register mode is finalized.
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–
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–
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9) Press key.
Mode setting is finalized and the mode returns
to the normal mode.
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− 27 −
Page 31
(2) Sewing operation
Operation example : Perform sewing with the contents of the registered C1.
1) Turn ON the power switch.
2) Set the pattern No. to “C1-1 ” using the or
key. Scroll as follows :
/ 0 to 99 ,/ P1 to P50 ,/ C1 to C20 ,
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⇔
3) Press the key. When the sewing LED lights
up, the work clamp feet will go up after having
moved.
4) If the contour of the pattern is acceptable, the
sewing can be made.
5) Every time the sewing is finished, the step is made
in the order of the combination. After completing
one cycle of sewing, the step returns to the first
step. The sewing can be made repeatedly.
/ “C1. 1” / “C1. 2” / “C1. 3”
* When you desire to return the pattern to the
previous one or skip the next pattern after sewing,
press or key in a state that the sewing
LED lights up. The indication of the pattern will
change, and the work clamp feet will move to the
sewing start point.
*If the contents of P1 to P50 are changed after
registration of C1 to C20, the contents of P1 to P50
used in C1 to C20 will change. So, be careful.
* Make sure of the contour of the pattern for each of
the patterns. (Refer to the item “2. Checking the
contour of a sewing pattern”.)
− 28 −
Page 32
3. Performing sewing using the “bobbin thread counter”
The production counter can be used as the bobbin thread counter. In case a same sewing pattern is sewn in
repetition, the sewing machine will stop sewing when the number of times (the specified number) that can
be sewn with a bobbin is reached. The bobbin thread counter is of the subtracting method.
The counter at the time of delivery is set to the production counter (adding method).
If it is used as the bobbin thread counter, it is necessary to change over memory switch No.
18. (Refer to the item "[8] HOW TO USE THE MEMORY SWITCH", P. 38.)
1) Press key to indicate the Counter .
2) Then press the key.
3) Then press the or key, and set the
specified number of times that can be sewn with a
bobbin.
4) Every time the sewing machine finishes a sewing
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cycle, counting-down is made by one.
5) When the sewing machine finishes the specified
number of times, the sewing machine does not start
even if depressing the pedal.
6) Replace the bobbin with a new one, and press the
key. The value of the counter returns to the
set value.
7) Repeat the steps of procedure from the steps 4) to
6).
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4. How to use the temporary stop
When memory switch No. 31 is set to "1", key can be used as the temporary stop key. (Refer to " HOW
TO USE THE MEMORY SWITCH" P.38.)
1) Sewing machine stops by means of key.
Error 50 is indicated.
2) There are three operations after stop as below.
漓 Re-start of sewing by means of the start switch.
滷 Press key to perform thread trimming, perform positioning with or key, and re-start
by means of the start switch.
澆 Press key to perform thread trimming, and press again key to return to the origin.
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− 29 −
Page 33
5. Setting the pattern thread tension
Needle thread tension for 6 stitches at the sewing start, the portion which is changed over from basting stitch
to zigzag stitch, and the portion of tie stitch at the sewing end can be individually set.
1)
2)
3), 4)
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1) While the sewing LED lights up, press key
to indicate the needle thread tension .
2) Lower the presser with the foot pedal.
When the foot pedal is depressed until it
will go no further, the sewing machine
starts. So, be careful.
3) Move the feed with
4) “c” is indicated at the position where the tension
setting is possible.
5) Pressing
key.
6) Repeat steps 3), 4) and 5) to set the tension.
7) When setting is completed, press key.
The presser moves to the origin and goes up.
key, set the tension with or
key.
5)
7)
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− 30 −
Page 34
6. Cautions in operation
(1) When the error indicator lamp lights up, be sure to check the cause of trouble and take a proper corrective
measure.
(2) Do not draw, by hand, the material being sewn during sewing. Doing so will cause the needle shift from
the correct position. If the needle moves from the correct position, press the key two times. This
will return the needle to the normal origin.
(3) Do not turn OFF the power in a state that the needle is lowered. The presser comes down and the wiper
interferes with needle. As a result, there is a danger of needle breakage or the like.
Reference for the sewing speed to be applied
Sewn product / thread / needle Head type / Sewing speed
8-layered denim / Cotton thread #50 / DPx5 #16 S (Standard) / 3,000 rpm
8-layered woolen gabardine / Polyester filament #50 / DPx5 #14 S (Standard) / 2,300 rpm
8-layered denim / Cotton thread #20 / DPx17 #19 H (Heavy-weight material)/3,000 rpm,
W (Double-capacity hook)/2,700 rpm
Overlapped sewing of 6 x 12-layered denim / Cotton thread #20 / DPx17 #19 H (Heavy-weight material) / 2,500 rpm
Tricot + shoulder strap (3 + 1) layered section / Polyester spun #60 / DPx5 #11 F (Foundation) / 2,000 rpm
* To prevent the thread breakage due to the needle heat, set the sewing speed referring to the above table
in accordance with the sewing conditions.
* For sewing the foundation or the like, lower the height of the needle bar to prevent the stitch skipping.
(Refer to the item “Adjusting the height of the needle bar”)
[7] MAINTENANCE
1. Adjusting the height of the needle bar
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
笆
笊
綏 : Engraved line
for DP x 5
絽 : Engraved line
for DP x 17
笳
絽 is for H and W types only
Bring needle bar 笊 to the lowest position of its stroke. Loosen needle bar connection screw 笆 and adjust so
that upper marker line 笘 engraved on the needle bar aligns with the bottom end of needle bar bushing,
lower 笳. For F type only, adjust the needle bar to the position where it is lowered by 0.8 mm to 1 mm from
the center of upper marker line 笘 engraved on the needle bar.
笘 : Upper
engraved line
笊
笘
0.8 to 1mm
F type only.
After the adjustment, make sure that there is no uneven torque.
* When stitch skipping occurs in accordance with the sewing conditions, adjust the height of the needle
bar so as to lower it by 0.5 to 1 mm from the needle bar engraved line 笘 .
− 31 −
Page 35
2. Adjusting the needle-to-shuttle relation
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Relation between needle and engraved lines
笳
笳
笆
笊
笊笆
笘
笙
笞
笳
笆
笘
笆
0 mm
笊
笳
1) Turn the handwheel by hand. When needle bar 笊
has gone up, adjust so that lower marker line 笆
engraved on the needle bar aligns with the bottom
end of the needle bar bushing 笳 , lower.
2) Loosen setscrew 笊 in the driver. Open inner hook
pressers 笆 to the right and left, and remove inner
hook presser 笳 .
At this time, be careful not to let inner
hook 笘 come off and fall.
3) Adjust so that the blade point of inner hook 笘 aligns
with the center of needle 笙, and that a clearance
of 0 mm is provided between the front end of the
driver and the needle as the front end face of driver
笞 receives the needle to prevent the needle from
being bent. Then tighten setscrew 笊 of the driver.
0.05 to 0.1 mm
筐
笶
0 mm
笙
笘
7.5 mm
筐
笊
笵
笨
4) Loosen setscrew 笵 of the shuttle, and adjust the
longitudinal position of the shuttle. To do this
adjustment, turn shuttle race adjusting shaft 笨
clockwise or counterclockwise to provide a 0.05 to
0.1 mm clearance between needle 笙 and the blade
point of inner hook 笘 .
5) After adjusting the longitudinal position of the
shuttle, further adjust to provide a 7.5 mm clearance
between the needle and the shuttle by adjusting
the rotating direction. Then tighten setscrew 笵 of
the shuttle.
Apply a small amount of oil to race section
笶 and oil wick 筐 , and use the sewing
machine after an extended period of
disuse or cleaning the periphery of hook
portion.
− 32 −
Page 36
3. Adjusting the lift of the work clamp foot
WARNING :
As the work is performed while the power is ON, never touch the switches other than the necessary one
so as to prevent accidents caused by the malfunction of switches.
Max. 17 mm
At this time, be careful not to cause work clamp foot lever support plate 笨 to interfere with
feed bracket 笶 .
If the work clamp foot lever support plate interferes with the wiper, readjust the height of the
wiper using setscrew 筐 in the wiper installing base.
筐
笊
笳
笘
笵
笙
笨
笶
笆
1) With the machine in stop mode, remove six
setscrews 笊 of the top cover, and take off top cover
笆 .
2) Apply L-shaped wrench 笳 to socket bolt 笙 of
clamp 笘 , and loosen the socket bolt.
3) Push down L-shaped wrench 笳 to increase the lift
of the work clamp foot, or pull it up to decrease the
lift.
4) After the adjustment, securely tighten socket bolt
笙 .
5) If the right and left work clamp feet are not levelled,
loosen fixing screw 笵 and adjust the position of
the work clamp foot lever support plate 笨 to level
them.
4. The moving knife and counter knife
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
笆
0.5 mm
笙
笘
Throat plate
笳
18.5 mm
笊
1) Loosen adjusting screw 笳 so that a clearance of
18.5 mm is provided between the front end of the
throat plate and the top end of thread trimmer lever,
small 笊 . To adjust, move the moving knife in the
direction of arrow.
2) Loosen setscrew 笙 so that a clearance of 0.5 mm
is provided between needle hole guide 笆 and
counter knife 笘. To adjust, move the counter knife.
− 33 −
Page 37
5. Needle thread clamp device
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
笊
笊
1) When thread is caught at top end 笊 of the thread
clamp, thread clamp becomes incomplete and
sewing trouble at the sewing start will be caused.
Remove it with tweezers or the like.
2) When removing thread waste or thread dust
collected on the thread clamp device, remove it
after removing the throat plate.
6. Adjustment of the wiper
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
1.5 mm or more
23 to 25 mm
笊
1) Loosen screw 笊 to adjust so that a clearance of
1.5 mm or more is provided between the wiper and
the needle.
At this time, the standard of the distance between
the wiper and the needle is 23 to 25 mm. By
adjusting the distance wide, the work clamp foot
can prevent stepping on needle thread when it
comes down.
Especially when the thin needle is used, adjust the
distance wide to such an extent of 23 mm.
* The position of the needle is when the sewing
mechine has stopped after the sewing finished.
− 34 −
Page 38
7. Draining waste oil
笊
8. Amount of oil supplied to the hook
笘
笳
笆
笊
When polyethylene oiler 笊 becomes filled with oil,
remove polyethylene oiler 笊 and drain the oil.
1) Loosen setscrew 笊 and remove setscrew 笊 .
2) When screwing in adjustment screw 笆 , the
amount of oil of oil pipe, left 笘 can be reduced.
3) After the adjustment, screw in setscrew 笊 and fix
it.
1. The state of standard delivery is the
position where 笳 is lightly screwed in
and returned by 4 turns.
2. When reducing the amount of oil, do
not screw in the screw at once.
Observe the state for approximately
half a day at the position where 笳 is
screwed in and returned by 2 turns. If
reducing is excessive, worn-out of the
hook will result.
9. Replacing the fuse
WARNING :
1. To avoid electrical shock hazards, turn OFF the power and open the control box cover after about five
minutes have passed.
2. Open the control box cover after turning OFF the power without fail. Then, replace with a new fuse
with the specified capacity.
笊
笆
笳
The machine uses the following three fuses :
笊 For pulse motor power supply protection
5A (time-lag fuse)
笆 For solenoid and pulse motor power supply
protection
3.15A (time-lag fuse)
笳 For control power supply protection
2A (fast-blow type fuse)
− 35 −
Page 39
10. Changing the voltage of 100/200V
WARNING :
To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine,
carry out the work after turning OFF the power switch and a lapse of 5 minutes or more. To prevent
accidents caused by unaccustomed work or electric shock, request the electric expert or engineer of
our dealers when adjusting the electrical components.
It is adaptable to the voltage of single phase 100V to 120V/3-phase 200V to 240V by changing the voltage
changeover connector mounted on FLT p.c.b.
(Caution) When the changing procedure is wrong, the control box will be broken. So, be very careful.
Changing procedure of the changeover connector
1. Turn OFF the power source with the power switch
after confirming that the sewing machine has
stopped.
2. Draw out the power cord from the power plug
socket after confirming that the power switch is
turned OFF. Then wait for five minutes or more.
3. Remove the front cover.
4. Remove four screws fixing the rear cover of the
control box and slowly open the rear cover.
1
• Changing the changeover connector
Connect to 200V the 100/200V changeover
A. In case of using with 3-phase 200V to 240V
A
connector of FLT p.c.b. 1 located on the side
of the Box Side of the control box.
• Connect the crimp style terminal of AC input cord
to the power plug as shown in the figure.
B. In case of using with single phase 100V to 120V
• Changing the changeover connector
Connect to 100V the 100/200V changeover
connector of FLT p.c.b. 1 located on the side
of the Box Side of the control box.
• Connect the crimp style terminal of AC input cord
to the power plug as shown in the figure.
WHITE
BLACK
RED
GREEN/
YELLOW
(Plug side)
WHITE
BLACK
RED
GREEN/
YELLOW
(Caution) Securely perform the insulation
B
treatment to the red terminal which is
not used with insulation tape or the like.
(When the insulation is insufficient,
there is a danger of electric shock or
leakage current.)
(Plug side)
WHITE
BLACK
RED
WHITE
BLACK
RED
C. In case of using with single phase 200V to 240V
• Changing the changeover connector
Connect to 200V the 100/200V changeover
connector of FLT p.c.b. 1 located on the side
GREEN/
YELLOW
GREEN/
YELLOW
of the Box Side of the control box.
• Connect the crimp style terminal of AC input cord
to the power plug as shown in the figure.
C
(Caution) Securely perform the insulation
treatment to the red terminal which is
not used with insulation tape or the like.
(When the insulation is insufficient,
there is a danger of electric shock or
leakage current.)
WHITE
BLACK
RED
GREEN/
YELLOW
WHITE
BLACK
RED
GREEN/
YELLOW
(Plug side)
5. Check that the change has been performed without
fail before closing the rear cover.
6. Be careful that the cord is not pinched between
the rear cover and the control box main unit. Close
the rear cover while pressing the lower side of rear
cover, and tighten four screws.
− 36 −
Page 40
11. Replenishing the designated places with grease
When the sewing machine has been used for a certain number of times of sewing, error code No. E220 is
displayed on the operation panel at the time of turning ON the power. This display informs the operator of
the time of replenishing the designated places with grease. Be sure to replenish the places with the grease
below. Then call the memory switch No. 245 and set it to "0" with the RESET key.
Even after the display of the error No. E220, when the RESET key is pressed, the error is released, and the
sewing machine can be continuously used. Afterwards, however, the error No. E220 is displayed every time
the power is turned ON.
In addition, when the sewing machine is used further for a certain period of time after the display of error No.
E220, the error No. E221 is displayed and the sewing machine fails to operate since the error cannot be
released even when the RESET key is pressed.
When the error No. E221 is displayed, be sure to replenish the designated places below with grease. Then
start up the memory switch and set No. 245 to "0" with the RESET key.
1. After replenishing the places with grease, the error No. E220 or No. E221 is displayed
again unless the memory switch No. 245 is changed to "0".
2. Use grease tube (Part No. 40013640) supplied as accessories to replenish the designated
places below with grease.If grease other than the designated one is replenished, damage
of components will be caused.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
(1) Replenishing the eccentric cam section with grease
y
1) Open the upside cover and remove the grease
2) Remove rubber cap w located on the side of
q
w
(2) Replenishing the oscillator pin section with grease
1) Tilt the machine head and remove the grease cover
e
2) Remove setscrew r in oscillator gear e, screw in
3) Securely tighten setscrew r which has been
t
r
u
cover y.
eccentric cam q. Then replenish there with grease.
u.
the grease tube attached joint t supplied as
accessories, and replenish there with the grease.
removed after replenishing with the grease.
− 37 −
Page 41
[8] HOW TO USE THE MEMORY SWITCH
The sewing machine operation can be changed by changing the setting of the memory switch.
1. Start and change of the memory switch
1) When key is pressed in the state that the
sewing LED is put out, the memory switch
setting mode is obtained.
1.30 which is indicated when "M" key is pressed
indicates that the max. speed limitation of the
first memory switch is 3,000 rpm. (State at the
time of delivery from the factory)
2) Change the memory switch No. with or
key.
e
Three figures from
the top are memory
switch Nos.
e
Two figures from the
bottom are contents
of setting.
3) Adjust the memory switch No. to the No. you
desire to change, and press key. The
sewing LED lights up.
4) Change the contents of the memory switch with
or key.
e
5) The value can be returned to the value at the time of delivery from the factory with key.
6) Press key to register the contents of change. Sewing LED goes off and the mode returns to the
selective state of the memory switch No.
7) Press key to finalize the memory switch setting mode and the mode returns to the normal mode.
2. Example of the memory switch setting
(1) Setting the max. sewing speed limitation
Setting example : Setting the max. sewing speed limitation to 1,800 rpm
1) Press key in the state that the sewing LED
is put out.
The memory switch is started and the contents
of memory switch No. 1 are indicated.
It is not necessary to change the sewing speed
since the max. speed limitation of the sewing
machine is set with memory switch No. 1. The
indicated memory switch No. can be changed
over with or key.
− 38 −
e
Page 42
2) Press key in the state that memory switch
No. 1 is indicated to make the sewing LED light
e
up. The contents of memory switch No. 1 (max.
sewing speed limitation value of the sewing
machine) are indicated.
3) Set "1800" with or key.
e
4) Register the value with key. Sewing LED goes off.
5) Press key to return to the normal state.
The sewing machine speed in the normal state cannot be increased more than the value
which has been set here.
(2) Setting the soft start speed at the sewing start
The speed of the first stitch to the fifth stitch at the sewing start can be set in a unit of 100 rpm. Two kinds of
settings, in case of with needle thread clamp and of without needle thread clamp can be performed. (See
Table of functions of the memory switch.)
In case of with needle thread clamp Unit : rpm
State when delivered Setting range
1st stitch 1500 400 to 1500
2nd stitch 3000 400 to 3000
3rd stitch 3000 400 to 3000
4th stitch 3000 400 to 3000
5th stitch 3000 400 to 3000
For the max. sewing speed, the memory switch No. 1 (max. sewing speed limitation) has
priority.
Setting example : In case of with needle thread clamp, the speed is changed as follows.
1st stitch from 1,500 to 1,000 rpm and 2nd stitch from 3,000 to 2,000 rpm
1) Press key in the state that the sewing LED
is put out.
e
2) Indicate memory switch No. 2 with or
key.
e
Here, set the sewing speed of the first stitch.
3) Press key. The sewing LED lights up and
the set value of the first stitch is indicated.
− 39 −
e
Page 43
4) Indicate "1000" with or key. The
value returns to the initial value at the time of
delivery from the factory with key.
Press key to cancel the operation here and
return to the state of step 2).
5) Press key. The sewing LED goes off and
the set value of the first stitch is registered.
6) Indicate memory switch No. 3 with or
key.
Here, set the sewing speed of the second stitch.
7) Press key The sewing LED lights up and
the set value of the second stitch is indicated.
8) Indicate "2000" with or key.
The value returns to the initial value at the time
of delivery from the factory with key.
Press key to cancel the operation here and
return to the state of step 6).
e
e
e
e
e
9) Press key. The sewing LED goes off and
the set value of the second stitch is registered.
10) Press key. The memory switch setting mode is finalized and the mode returns to the normal mode.
e
(3) Setting whether the calling of pattern data is operative or not
By making inoperative the calling of the unnecessary pattern, this setting prevents the different pattern from
calling by mistake.
Also, it is possible to call and use the necessary pattern.
Setting example : Make the calling of pattern Nos. 2 and 3 inoperative.
1) Press key in the state that the sewing LED
is put out.
2) Indicate memory switch No. 201 with or
key.
e
e
− 40 −
Page 44
3) Press key. The sewing LED lights up and
the set value of pattern No. 1 is indicated.
Set value 1 : Calling is operative.
Set value 0 : Calling is inoperative.
4) Set pattern No. 2 with or key.
5) Set the set value to "0" with key.
6) Set pattern No. 3 with or key.
7) Set the set value to "0" with key.
e
e
e
e
e
8) Press key to register the set value. The
sewing LED goes off.
9) Press key. The memory switch setting mode is finalized and the mode returns to the normal mode.
e
(4) Setting the counter operation
Setting example : The production counter (adding method) can be changed to the bobbin thread counter
(subtracting method).
1) Press key in the state that the sewing LED
is put out.
2) Indicate memory switch No. 18 with or
key.
3) Press key. The sewing LED lights up and
the set value of counter motion is indicated.
e
e
e
4) Set the set value to "1" with key.
Set value 0 : Production counter
Set value 1 : Bobbin thread counter
5) Press key to register the set value. The sewing LED goes off.
6) Press key. The memory switch setting mode is finalized and the mode returns to the normal mode.
e
− 41 −
Page 45
3. Table of functions of the memory switch
Various operations of sewing machine can be set in programs by operating the memory switches.
There are items that change the initial values at the time of delivery according to the models.
Indication Function
Max. sewing speed (Speed can
be set in a unit of 100 rpm.)
Sewing speed of 1st stitch (With
needle thread clamp) (Speed can
be set in a unit of 100 rpm.)
Sewing speed of 2nd stitch (With
needle thread clamp) (Speed can
be set in a unit of 100 rpm.)
Sewing speed of 3rd stitch (With
needle thread clamp) (Speed can
be set in a unit of 100 rpm.)
Sewing speed of 4th stitch (With
needle thread clamp) (Speed can
be set in a unit of 100 rpm.)
Sewing speed of 5th stitch (With
needle thread clamp) (Speed can
be set in a unit of 100 rpm.)
Thread tension of 1st stitch (With
needle thread clamp)
Thread tension at the time of
thread trimming
Changeover timing of thread
tension at the time of thread
trimming
Sewing speed of 1st stitch
(Without needle thread clamp)
(Speed can be set in a unit of 100
rpm.)
13. Sewing speed of 2nd stitch
(Without needle thread clamp)
(Speed can be set in a unit of 100
rpm.)
Sewing speed of 3rd stitch
(Without needle thread clamp)
(Speed can be set in a unit of 100
rpm.)
Sewing speed of 4th stitch
(Without needle thread clamp)
(Speed can be set in a unit of 100
rpm.)
Sewing speed of 5th stitch
(Without needle thread clamp)
(Speed can be set in a unit of 100
rpm.)
Thread tension of 1st stitch
(Without needle thread clamp)
Changeover timing of thread
tension at the sewing start
(Without needle thread clamp)
Setting whether or not indication
or change of pattern No., X/Y
scale rate and max. speed
limitation is acceptable.
(Prevention of misapplication)
Setting range
400 to 3000
400 to 1500
400 to 3000
400 to 3000
400 to 3000
400 to 3000
0 to 200
0 to 200
-6 to 4
400 to 1500
400 to 3000
400 to 3000
400 to 3000
400 to 3000
0 to 200
-5 to 2
0 : Operative
1 : Inoperative
State when delivered
3000
1500
3000
3000
3000
3000
200
0
0
400
900
3000
3000
3000
0
-5
0
Remarks
For LK-1903A, set to 2700.
In case of setting 1, use of M key
is prohibited as well. When
changing memory switch,
pressing M key, turn ON the power
switch.
− 42 −
Page 46
Indication Function
Counter operation
Selection of pedal
Selection of start pedal
Optional pedal 1 operation
Optional pedal 2 operation
Height of work clamp foot at the
time of 2-step stroke
Selection of base point of pattern
enlargement/reduction
Sewing machine operation can be
stopped with panel key (clear key).
Buzzer sound can be prohibited.
Number of stitches that needle
thread clamp releases is set.
Clamping timing of needle thread
clamp can be delayed.
Needle thread clamp control can
be prohibited.
Feed timing is selected.
When stitches are not well-
tightened, set the value in “–”
direction.
State of work clamp foot after
completion of sewing can be
selected.
Execution of origin retrieval every
time after completion of sewing
can be performed. (Except cycle
stitching)
Setting of origin retrieval in cycle
stitching can be set.
Setting range
0 : Production counter
(adding)
1 : Bobbin thread counter
(subtracting)
0 : Standard pedal
1 : Standard pedal (2-step
stroke)
2 : Optional pedal
3 : Optional pedal (2-step
stroke)
0 : Standard pedal
1 : Optional pedal
0 : OFF when depressing
pedal again
1 : OFF when detaching from
pedal
0 : OFF when depressing
pedal again
1 : OFF when detaching from
pedal
50 to 90
0 : origin
1 : Sewing start point
0 : Ineffective
1 : Panel reset key
2 : External switch
0 : Without buzzer sound
1 : Panel operation sound
2 : Panel operation sound +
error sound
1 to 7 stitches
-10 to 0
0 : Normal
1 : Prohibited
-8 to 16
0 : Work clamp foot goes up
after moving at the sewing
start
1 : Work clamp foot goes up
immediately after the end
of sewing.
2 : Work clamp foot goes up
by pedal operation after
moving at the sewing
start.
0 : Without origin retrieval
1 : With origin retrieval
0 : Without origin retrieval
1 : Every time 1 pattern is
completed
2 : Every time 1 cycle is
completed
State when delivered
0
0
0
0
0
70
0
0
2
2
0
0
12
1
0
0
Remarks
Height is lowered when the set
value is increased.
Timing is delayed in “-” direction.
Misapplication of panel is
protected. For LK-1903A, set to
"1".
Setting on excessive “–” side may
cause needle breakage. Be
careful when sewing heavy-
weight material.
For LK-1903A/BR35, set to “0”.
− 43 −
Page 47
Indication Function
State of work clamp foot when
machine stopped by temporary
stop command can be selected.
Needle bar stop position is set.
Thread trimming can be
prohibited.
Route of origin return by means
of clear key can be selected.
Bobbin winding speed can be set.
Setting range
0 : Work clamp foot goes up.
1 : Work clamp foot goes up
with work clamp foot
switch.
2 : Lift of work clamp foot is
prohibited.
0 : UP position
1 : Upper dead point
0 : Normal
1 : Thread trimming
prohibited
0 : Straight line return
1 : Reverse return of pattern
800 to 2,000
State when delivered
0
0
0
0
1600
Remarks
Needle bar rotates in the reverse
direction after the UP position stop
and stops when upper dead point
stop is set.
This function is used when straight
line return from the midway of
pattern to the start of sewing is not
possible.
Max. speed limitation has priority.
Operation timing of material
closing is selected.
LK-1901A only
Wiper operation method can be
selected.
Tie stitching at the start of sewing
of the pattern for button sewing
can be prohibited. For LK-1903A
only
Position of origin moves 5 mm to
the front.
This function sets whether or not
the calling of the pattern data is
operative.
Grease replenishing time
information counter
Register of the pattern is
performed.
Register of the cycle stitching is
performed.
0 : Output prohibited
1 : Operation when work
clamp foot comes down.
2 : Operation at the time of
start
0 :Without wiper at the
time of thread trimming
on the way
1 : With wiper at the time of
thread trimming on the
way 漓
2 : With wiper at the time of
thread trimming on the
way 滷
3 : Magnet wiper
0 : Tie stitching effective
1 : Tie stitching ineffective
0 : Standard
1 : Front
0 : Calling inoperative
1 : Calling operative
2
1
0
0
Setting depends on
the model used.
–
For the machines other than LK-
1901A, this function is not
indicated.
漓 : Without return of the last wiper
滷 : With return of the last wiper
For the machines other than LK-
1903A, thus function is not
indicated.
Necessary to set this function
when using work clamp foot and
pattern of LK-1904
Service pattern Nos. 1 to 64 can
be individually set.
Refer to the item “Replenishing the
designated places with grease” of
MAINTENANCE, p.37.
Refer to the item “Performing
sewing using the pattern keys”, P.
24.
Refer to the item “Performing
sewing using the combination
function”, P. 27.
− 44 −
Page 48
[9] OTHERS
1. Setting the DIP switch
SDC p.c.b.
q
MAIN p.c.b.
w
When “4” of DIP switch w on SDC circuit board q is
turned ON, the penetrating force is increased. Turn it
ON when the penetrating force is insufficient.
Turn OFF all DIP switches other than the switch above.
Perform the changeover of DIP switch
after turning OFF the power.
Be very careful of the heat of the main
shaft motor.
Turn OFF all DIP switches of MAIN p.c.b.
− 45 −
Page 49
2. Table of the standard pattern specifications
NO Lengthwise Crosswise Number of stitches Pattern S, F, H M
1 2.0 16 42 Large size bartacking ＊
2 2.0 10 42 Large size bartacking ＊
3 2.5 16 42 Large size bartacking ＊
4 3.0 24 42 Large size bartacking
5 2.0 10 28 Large size bartacking ＊
6 2.5 16 28 Large size bartacking ＊
7 2.0 10 36 Large size bartacking ＊
8 2.5 16 36 Large size bartacking ＊
9 3.0 24 56 Large size bartacking
10 3.0 24 64 Large size bartacking
11 2.5 6 21
12 2.5 6 28
13 2.5 6 36
14 2.0 814Knit goods bartacking ＊＊
15 2.0 821Knit goods bartacking ＊＊
16 2.0 828Knit goods bartacking ＊＊
17 01021Straight line bartacking ＊
18 01028Straight line bartacking ＊
19 02528Straight line bartacking
20 02536Straight line bartacking
21 02541Straight line bartacking
22 03544Straight line bartacking
23 20 4.0 28 Lengthwise bartacking
24 20 4.0 36 Lengthwise bartacking
25 20 4.0 42 Lengthwise bartacking
26 20 4.0 56 Lengthwise bartacking
27 20 0 18
Small size bartacking (eyelet)
Small size bartacking (eyelet)
Small size bartacking (eyelet)
Lengthwise straight line bartacking
＊
＊
＊
28 10 0 21
29 20 0 21
30 20 0 28
38 2.0 828Knit goods bartacking ＊＊
In the condition of delivery from the factory, the pattern sewing with ＊ marks can be made.
When using the standard patterns other than the pateterns with ＊ marks, refer to “Setting whether the
calling of the pattern data is operative or not” described in the item of the how to use the memory switch.
− 46 −
Lengthwise straight line bartacking
Lengthwise straight line bartacking
Lengthwise straight line bartacking
Page 50
3. Table of the standard patterns
No
Stitch diagram
1
(51)
2
3
※
4
※
Large size bartacking
5
6
※
7
8
※
9
※
10
※
11
Small size bartacking
Number of
stitches
42
28
36
56
64
21
Sewing size
(mm)
Length-
Cross-
wise
wise
2.0
2.0
2.5
3.0
2.0
2.5
2.0
2.5
3.0
3.0
2.5
16
10
16
24
10
16
10
16
24
24
6
(Note 2)
No. of work
clamp foot
1
2
3
1
2
3
1
4
6
7
1
2
3
1
4
1
2
3
1
4
6
7
6
7
8
Number of
stitches
No
17
18
Stitch diagram
21
28
Straight line bartacking
19
20
21
22
23
Lengthwise bartacking
(Other side)
24
(Other side)
25
(Other side)
26
Lengthwise straight line bartacking
(Other side)
27
36
41
44
28
(This side)
36
(This side)
42
(This side)
56
(This side)
18
Sewing size
(mm)
Length-
Cross-
wise
wise
0
0
0
0
0
0
20
4.0
20
4.0
20
4.0
20
4.0
20
10
10
25
25
25
35
0
(Note 2)
No. of work
clamp foot
1
2
3
1
2
3
6
7
6
7
6
7
(Note3)
9
10
9
10
9
10
9
10
11
12
13
14
Knit goods bartacking
15
16
28
36
14
21
28
2.5
2.5
2.0
2.0
2.0
(Other side)
6
6
8
5
28
(Other side)
29
(Other side)
30
(Other side)
(This side)
21
(This side)
(This side)
28
(This side)
10
20
20
0
0
0
8
1. Sewing size shows the dimensions when the
scale rate is 100%.
8
− 47 −
2. Refer the No. of work clamp foot to the
separate table of work clamp foot.
3. For No. 22, process the work clamp foot
blank for use.
4.
Use the patterns with ※marks for sewing denim.
5. No. 51 is for the machine without thread
clamp device.
Page 51
No
Stitch diagram
31
32
33
Semilunar bartacking
34
35
Number of
stitches
52
63
24
31
48
Sewing size
(mm)
Cross-
Length-
wise
wise
7
10
7
12
6
10
6
12
10
7
(Note 2)
No. of work
clamp foot
13
13
13
13
14
No
41
42
Stitch diagram
Number of
Sewing size
stitches
Length-
29
39
wise
20
25
(mm)
Cross-
wise
2.5
2.5
(Note 2)
No. of work
clamp foot
12
12
36
Large size bartacking
37
Knit goods bartacking
38
Round bartacking
39
48
90
28
28
10
3
2
ø12
24
43
45
25
2.5
12
Lengthwise bartacking
7
14
44
58
30
2.5
12
6
7
45
8
5
46
75
42
30
30
2.5
2.5
12
12
16
40
48
(Caution)
Pattern Nos. 41 to 46 are for the optional
work clamp foot No. 12. The origin of the
patterns is different by 5 mm up and down
from that of lengthwise bartacking pattern
Nos. 23 to 26.
− 48 −
47
Radial tacking
48
49
50
91
99
148
164
ø8
15
Page 52
4. Table of the work clamp foot
12345
13518659 (asm.) 13548557 (asm.) 13542964 (asm.)
Work clamp foot
Feed plate
Sewingspecification
※ Finger guard
40
20
27
32.8
4.5
40
21
27
32.3
5.1
40
10
22
14116107 14116404 14116800 14116305 14116206
(With knurl)
25
17.5
29
(Without knurl) (Without knurl)
25
14.5
17.5
29
14.5
20
(With knurl) (With knurl)
4.6
21.2
5.4
11.4
SFFH / WM
13533104
33.4
3.4
4.8
Supplied with F (foundation) type
machine head.
(Depends on the destination)
Optional
Standard
accessory for M
(knit goods) type
machine head.
Remarks
Standard
accessory for S
(standard) type
machine head.
※ Install a finger guard suitable for each work clamp foot when replacing the work clamp foot.
− 49 −
Page 53
6 7891011
13548151(asm.) 13542451 (asm.) 13571955 (asm.) 13561360 (asm.)
Work clamp
foot
Feed plate
Sewing
specification
※ Finger
guard
Remarks
24.1
23
20
2
40.5
27
35
32.6
5
40
10
22
32.8
4.5
50
5.6
12
13548003 13554803 14116602 14116503 14116909 14116701
(With knurl)
25
18.5
37.3
(With knurl) (With knurl)
5.4
15
27.4
24
(Without knurl) (Without knurl) (Without knurl)
22
2.4
17.5
15
25
40
23
5.6
SH / WS FFF
13548300 13533104 13573407
Standard
accessory for H
Optional Optional
type (Heavy-weight
material) and W
type(Doublecapacity hook)
machine head.
Accessory part for F (foundation)
type. (Depends on the destination)
Optional
54
24
Work clamp
foot
Feed plate
Sewing
specification
※ Finger
guard
12
14137509 (right)
14137608 (left)
23.5
60
33
4
13.6
14137707
(Without knurl)
30
16.6
F
14135305
13
40021871 (right)
40021872 (left)
41
14
23
28
9
40021873
14
40021874 (right)
40021875 (left)
45
ø12
40021876
15
40021877 (right)
40021878 (left)
45
12 29
40021879
40021880 (right)
40021881 (left)
30
45
10
ø10
(With knurl) (With knurl) (With knurl) (With knurl)
50
9.4
ø12.4
14.4
S
S
ø10.4
S
13533104
16
ø14
40021882
ø14.4
S
28
14
Remarks
Optional
Optional
Optional
Optional
Optional
※ Install a finger guard suitable for each work clamp foot when replacing the work clamp foot.
− 50 −
Page 54
5. LK-1900 data ROM
6. Connection of the optional pedal
Insert LK-1900 data ROM to the IC socket on MAIN
p.c.b for use.
1. Be careful of the inserting direction.
2. EEPROM cannot be used.
3. When the pattern No. is the same as
that of the standard pattern, the pattern
in the data ROM is prior to other
pattern.
ROM which can be used :
27C256 EPROM
JUKI Part No. : HL008423000
(1) Connection of PK-57
w
q
1) Connect PK-57 change cable w with CN41 of
MAIN circuit board q.
2) Connect the cord of PK-57 e with the PK-57
change cable at the rear face of the control box.
Then clamp two places with adhesive clamp r.
In addition, tighten with a screw the PK-57 ground
cable as illustrated in the figure.
PK-57 : Part No. GPK570010B0
PK-57 change cable : Part No. M90135900A0
Adhesive clamp : Part No. E9607603000
3) Set the memory switches as follows.
Memory switch No. Set value
19 2
20 1
24 1
w
r
Ground
cable
e
− 51 −
Page 55
Remarks
This error is output when
max. sewing area, 30 x 40
is over. Interference of the
work clamp foot with needle
is not protected.
Corrective measure
Turn OFF the power switch and remove the cause
of troubles.
Press the reset switch and check the pattern No.
Check the contents of memory switch No. 201.
Turn the hand pulley to return the needle bar to its
specified position.
Press the reset switch and check the pattern and X/
Y scale rate.
Press the reset switch and check the pattern and X/
Y scale rate.
Turn OFF the power switch and check the data
Refer to the item “Replenishing
the designated places with
grease” of MAINTENANCE,
p.37.
Refer to the item “Replenishing
the designated places with
grease” of MAINTENANCE,
p.37.
ROM.
Re-start or return-to-origin after thread trimming by
means of the reset switch (For the details, refer to
the item “How to use the temporary stop”, P.29.)
Replenish the designated places with grease and
set memory switch No. 245 to “0” with the reset key.
Error can be released with the reset key when
immediate replenishing with grease cannot be
performed during sewing operation.
Immediately perform replenishing with grease and
set memory switch No. 245 to “0” with the reset key.
The sewing machine cannot be operated with the
head tilted.
Return the sewing machine head to its proper
position.
Turn OFF the power switch and check whether CN14
of SDC circuit board is disconnected or loose.
Turn OFF the power switch and check whether CN66
of FLT circuit board is disconnected or loose.
Turn OFF the power switch and check whether CN65
of FLT circuit board is disconnected or loose.
Description of error
The main shaft of the sewing machine does not
rotate due to some troubles.
Name of error
Machine lock error
Indication
7. Error list
Back-uped pattern No. has not been registered in
the data ROM, or it is set to readout inoperative.
Pattern No. is set to “0”.
Needle bar is not in the specified position.
The sewing area is beyond the limit.
Pattern No. error
Needle bar position error
Sewing area over
The sewing pitch is beyond 10 mm.
The pattern data cannot be adopted.
Temporary stop by operating the reset switch while
the sewing machine is running. (Refer to memory
switch No. 31.)
Enlargement error
Pattern data error
Temporary stop
Information as to the time of replenishing the
designated places with grease
Grease replenishing time
information
Sewing machine has stopped since the time of
replenishing the designated places with grease has
come.
Head tilt detection switch is turned ON.
Grease replenishing warning error
Head tilt error
Detection of the upper dead point of the sewing
machine cannot be performed.
The thread trimmer is not in the proper position.
The needle thread clamp device is not in the proper
Z phase detection error
Thread trimmer position error
Needle thread clamp position
position.
error
− 52 −
Page 56
Remarks
Corrective measure
Turn OFF the power switch and check whether CN14
is loose or disconnected.
Turn OFF the power switch and check whether CN14
is loose or disconnected.
Turn OFF the power switch and check whether
coupling of the main motor is loose.
Check the power source voltage.
Check the power source voltage.
Turn OFF the power switch and turn ON the power
switch again after some time.
Check the cause of blown-
out of the fuse.
Check the cause of blown-
out of the fuse.
Turn OFF the power switch and check F1 fuse of
SDC circuit board.
Turn OFF the power switch and check F2 fuse of
SDC circuit board.
Turn OFF the power switch and turn ON the power
switch again after some time.
Turn OFF the power switch and check whether CN62
of INT circuit board or CN42 of MAIN circuit board is
disconnected or loose.
Turn OFF the power switch and check whether CN63
of INT circuit board or CN43 of MAIN circuit board is
disconnected or loose.
Turn OFF the power switch and check whether CN64
of INT circuit board or CN44 of MAIN circuit board is
disconnected or loose.
Turn OFF the power switch and check whether CN65
of INT circuit board or CN45 of MAIN circuit board is
disconnected or loose.
Turn OFF the power switch and check whether
coupling of the main motor is loose.
Description of error
Encoder A or B phase cannot be detected.
Encoder U, V or W phase cannot be detected.
The motor is reversing.
Power source voltage is beyond the specified value.
Power source voltage is short.
Name of error
Encoder trouble A
Encoder trouble B
Reverse rotation of motor
Overvoltage error
Low voltage error
Indication
Error from the motor driver is detected.
Power source of the stepping motor is not output.
Power source of the solenoid is not output.
Overheat of SDC circuit board
Motor driver trouble
Stepping motor power source
trouble
Solenoid power source trouble
SDC circuit board overheat
X origin sensor does not change.
X origin retrieval error
Y origin sensor does not change.
Y origin retrieval error
Work clamp foot origin sensor does not change.
Work clamp foot origin retrieval
Needle thread clamp origin sensor does not change.
error
Needle thread clamp origin
Timing lag between feed and main shaft has
occurred.
retrieval error
Feed trouble error
− 53 −
Page 57
Remarks
Corrective measure
Turn OFF the power switch and check whether CN34
of MAIN circuit board is loose.
Turn OFF the power switch and check whether CN32
of MAIN circuit board or CN15 of SDC circuit board
is disconnected or loose.
Turn OFF the power switch and turn ON the power
switch again after some time.
Turn OFF the power switch and check the insertion
of ROM of U22 of MAIN circuit board.
Turn OFF the power switch and check whether CN38
of MAIN circuit board is disconnected or loose.
Turn OFF the power switch and check the power
source voltage and check whether CN3 of FLT circuit
board or CN13 of SDC circuit board is disconnected
or loose.
Description of error
Communication between the panel and MAIN cannot
be performed.
Communication between MAIN and SDC cannot be
performed.
Overheat of MAIN circuit board
Memory write-in of MAIN circuit board cannot be
performed.
Memory write-in of the head circuit board cannot be
performed.
Power source voltage type is different.
Name of error
Communication error between
panel and MAIN
Communication error between
panel and SDC
MAIN circuit board overheat
MAIN memory write-in trouble
INT memory write-in trouble
Abnormal power source
Indication
The connector is disconnected.
Disconnection of connector
(Without indication)
− 54 −
Page 58
8. Troubles and corrective measures (sewing conditions)
Trouble
1. The needle thread
slips off at the start
of bar-tacking.
2. Thread often
breaks or synthetic
fiber thread splits
finely.
3. The needle often
breaks.
4. Threads are not
trimmed.
(Bobbin thread only)
5. Stitch skipping
often occurs.
Cause
漓 Stitches are slipped at the start.
滷 The needle thread remaining on
the needle after thread trimming
is too short.
澆 The bobbin thread is too short.
潺 Needle thread tension at 1st stitch
is too high.
潸 Thread clamp is unstable
(material is apt to be expanded,
thread is hard to slide, thread is
thick, etc.).
澁 Pitch at 1st stitch is too small.
漓 The shuttle or the driver has
scratches.
滷 The needle hole guide has
scratches.
澆 The needle strikes the work clamp
foot.
潺 Fibrous dust is in the groove of the
shuttle race.
潸 The needle thread tension is too
high.
澁 The tension of the thread take-up
spring is too high.
澀 The synthetic fiber thread melts
due to heat generated on the
needle.
漓 The needle is bent.
滷 The needle hits the work clamp
foot.
澆 The needle is too thin for the
material.
潺 The driver excessively bends the
needle.
潸 Needle thread is stepped on by
the work clamp foot at the start of
sewing. (Needle bend)
漓 The counter knife is dull.
滷 The difference in level between
the needle hole guide and the
counter knife is not enough.
澆 The moving knife has been
improperly positioned.
潺 The last stitch is skipped.
潸 Bobbin thread tension is too low.
漓 The motions of the needle and
shuttle are not properly
synchronized.
滷 The clearance between the
needle and shuttle is too large.
澆 The needle is bent.
潺 The driver excessively bends the
needle.
Corrective measures
藺 Adjust the clearance between the needle
and the shuttle to 0.05 to 0.1 mm.
藺 Set soft-start sewing at the start of
bartacking.
藺 Correct the thread tension release timing
of the thread tension controller No. 2.
藺 Increase the tension of the thread take-
up spring, or decrease the tension of the
thread tension controller No. 1.
藺 Decrease the tension of the bobbin
thread.
藺 Increase the clearance between the
needle hole guide and the counter knife.
藺 Decrease the tension at 1st stitch.
藺 Decrease the number of rotation at 1st
stitch at the sewing start. (Extent of 600
to 1,000 rpm)
藺 Increase the number of stitches of thread
clamp to 3 to 4 stitches.
藺 Make the pitch at 1st stitch longer.
藺 Decrease the needle thread tension at
1st stitch.
藺 Take it out and remove the scratches
using a fine whetstone or buff.
藺 Buff or replace it.
藺 Correct the position of the work clamp
foot.
藺 Take out the shuttle and remove the
fibrous dust from the shuttle race.
藺 Reduce the needle thread tension.
藺 Reduce the tension.
藺 Use silicone oil.
藺 Replace the bent needle.
藺 Correct the position of the work clamp
foot.
藺 Replace it with a thicker needle according
to the material.
藺 Correctly position the needle and the
shuttle.
藺 Widen the distance between the needle
and the wiper. (23 to 25 mm)
藺 Replace the counter knife.
藺 Increase the bend of the counter knife.
藺 Correct the position of the moving knife.
藺 Correct the timing between the needle
and the shuttle.
藺 In crease the bobbin thread tension.
藺 Correct the positions of the needle and
shuttle.
藺 Correct the positions of the needle and
shuttle.
藺 Replace the bent needle.
藺 Correctly position the driver.
Page
32
38
16
15
33
33
15
16
14
13
33
32
34
33
32
32
32
13
32
− 55 −
Page 59
Trouble
6. The needle thread
comes out on the
wrong side of the
material.
7. Threads break at
time of thread
trimming.
8. The thread clamp
is entangled with
needle thread.
9. Uneven length of
the needle thread
10. The length of
needle thread does
not become short.
11. T h e knotting
section of bobbin
thread at 2nd stitch
at the sewing start
appears on the
right side.
Cause
漓 The needle thread tension is not
high enough.
滷 The tension release mechanism
fails to work properly.
澆 The needle thread after thread
trimming is too long.
潺 Number of stitches is too few.
潸 When sewing length is short (End
of needle thread protrudes on the
wrong side of sewing product.)
澁 Number of stitches is too few.
漓 The moving knife has been
improperly position.
漓 The needle thread at the sewing
start is too long.
漓 The tension of thread take-up
spring is too low.
漓 The tension of thread tension
controller No. 1 is too low.
滷 The tension of thread take-up
spring is too high.
澆 The tension of thread take-up
spring is too low and motion is
unstable.
漓 Idling of bobbin is large.
滷 The bobbin thread tension is too
low.
澆 The needle thread tension at 1st
stitch is too high.
Corrective measures
藺 Increase the needle thread tension.
藺 Check whether or not the tension disc No.
2 is released during bar-tracking.
藺 Increase the tension of the thread tension
controller No. 1.
藺 Correct the position of the moving knife.
藺 Turn OFF the thread clamp.
藺 Turn OFF the thread clamp.
藺 Use the lower plate, the hole of which is
larger than the presser.
藺 Correct the position of the moving knife.
藺 Tighten thread tension controller No. 1
and make the length of needle thread 33
to 36 mm.
藺 Increase the tension of the thread take-
up spring.
藺 Increase the tension of thread tension
controller No. 1.
藺 Decrease the tension of thread take-up
spring.
藺 Increase the tension of thread take-up
spring and lengthen the stroke as well.
藺 Adjust the position of the moving knife.
藺 Increase the bobbin thread tension.
藺 Decrease the needle thread tension at
1st stitch.
藺 Turn OFF the thread clamp.
Page
15
15
33
− 56 −
Page 60
9. Table of the optional parts
Name of Parts
Feed plate blank
t = 1.2
Work clamp foot face plate (asm.)
Type
Without knurl / processed
Sewing area lengthwise 20 X crosswise 40
With knurl / processed
Sewing area lengthwise 20 X crosswise 40
Without knurl / stainless steel
Sewing area lengthwise 20 X crosswise 40
Without knurl / processed
Sewing area lengthwise 30 X crosswise 40
Without knurl / without processing
Sewing area lengthwise 30 X crosswise 40
Without knurl / stainless steel
Sewing area lengthwise 30 X crosswise 40
With knurl / processed
Sewing area lengthwise 30 X crosswise 40
With knurl / without processing
Sewing area lengthwise 30 X crosswise 40
Part No.
14120109
14120307
14120505
40021855
40021856
40021857
40021858
40021859
14121263
Remarks
t = 0.5
t = 0.5
Face plate for
presser blank
Presser blank
Needle hole guide
Finger guard (1)
ØB
t = 3.2
ØA
With knurl / Processed (right)
Sewing area lengthwise 20 X crosswise 40
With knurl / Processed (Left)
Sewing area lengthwise 20 X crosswise 40
With knurl / Processed (right)
Sewing area lengthwise 30 X crosswise 40
With knurl / Processed (Left)
Sewing area lengthwise 30 X crosswise 40
With knurl / without processing (right)
Sewing area lengthwise 30 X crosswise 40
With knurl / without processing (Left)
Sewing area lengthwise 30 X crosswise 40
A=1.6 B=2.6 With relief slit
A=1.6 B=2.0 Without relief slit
A=2.3 B=4.0 Without relief slit
A=2.7 B=3.7 Without relief slit
A=56.5 B=64
14121701
14121800
40021851
40021852
40021853
40021854
B2426280000
D2426282C00
14109607
D2426MMCK00
13533104
Standard type
F and M types
H and W types
For extra heavy-
weight material
A
B
A=59 B=74
− 57 −
13548300
For large size
bartacking
Page 61
Name of Parts
Finger guard (2)
B
Type
A=66.5 B=43
A
Part No.
13573407
Remarks
For
lengthwise
bartacking
Finger guard (3)
B
A
Work clamp foot blan
24
22
1414
36
SM8040302TP
7
7
A=21.5 B=35.5
With knurl / processed (right)
With knurl / processed (left)
14120000
40021869
40021870
For specially
ordered work
clamp
− 58 −
Page 62
蠡 . EXPLANATION OF THE LK-1901A, COMPUTER-CONTROLLED HIGH-
SPEED EYELET BUTTONHOLE BARTACKING MACHINE
1. Specifications
Different specifications from those of the LK-1900A only are described.
1) Sewing speed .............................................. Max. 3,000rpm
2) Needle ......................................................... DPx5 #14, #16
3) Lifting method of the work clamp foot .......... Stepping motor
4) Lift of the work clamp foot ...........................Max. 17mm
5) Number of standard patterns ....................... 3 patterns
6) Wiper method .............................................. Interlocked with work clamp foot lifter driven by stepping
motor
2. Installation of the sewing machine and preparation of the operation
WARNING :
Be sure to perform the work with two persons or more when moving the sewing machine.
笊
笆
1) Except for the connection of the work clamp foot bracket unit solenoid, installation of LK-1901A and
preparation of the operation are the same as those of the LK-1900A.
Refter to the instruction manual for the LK-1900A.
2) Connect connector CN47 笊 of the relay cable of the work clamp foot bracket unit with connector CN47
笆 mounted on the MAIN circuit board inside the control box.
− 59 −
Page 63
3. Adjustment of the material closing amount
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
C
C
Graduation
w
B
A
q
1) The maximum material closing amount is 4 mm. However, the amount is set to 2 mm at the time of
delivery because of the relation of the feed plate window and the work clamp foot (dimension C).
(Graduation position : 2)
2) Loosen bolt q and move work clamp foot regulator w in the direction of arrow to adjust the material
closing amount. The material closing amount will be dereased when work clamp foot regulator w is
moved in the direction of A, and be increased when it is moved in the direction of B.
To increase the material closing amount more than 3 mm, widen the feed plate window by
additional work (increase the dimension C.) so that the feed plate window does not interfere
with the work clamp foot.
4. Adjustment of the lift of the work clamp foot
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
w
B
Max. 17mm
A
q
1) Loosen two setscrews q and adjust by moving work clamp foot lifting plate w back and forth in the
direction os arrow. The amount of the lift os the work clamp foot will be decreased when work clamp
lifting plate w is moved in the direction of A, and be increased when it is moved in the direction of B. After
the adjustment, securely tighten setscrews q.
− 60 −
Page 64
5. Adjustment of the pressure of the work clamp unit
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
w
q
1) The pressure of the work clamp unit should be minimized as long as the material does not warp during
sewing. Loosen adjusting screw q and turn adjusting screw w to obtain the aforementioned pressure.
6. Setting of the material closing operation
1) The material closing operation is performed by the electromagnetic solenoid, and change-over of the
operation setting (effective / ineffective) is available. The material closing has been set to work
simultaneously with sewing at the time of delivery.
2) If the material closing is not performed, the change-over is made by the memory switch. For the way of
operation, refer to item “How to use the memory switch” described in the instruction manual for the LK-
1900A.
◎ List of memory switch functions
No.
50
Setting of material closing
operation
※ Setting range “1” : The material closing simultaneously works when the work clamp foot comes down.
Setting range “2” : The material closing simultaneously works with the sewing after the work clamp foot
※ As for the contents of memory switch function Nos. other than memory switch No. 50, refer to the list of
the memory switch functions described in the Instruction Manual for the LK-1900A.
Function
has come down.
Setting range
0 : Ineffective
1 : Synchronized with work clamp
foot
2 : Synchronized with start
State at time of delivery
2
− 61 −
Page 65
7. Selection and confirmation of the sewing patterns
WARNING :
In case of using an exclusive work clamp foot, make sure of the shape of the sewing pattern. If the
sewing pattern extends outside the work clamp foot, the needle interferes with the work clamp foot
during sewing, resulting in the danger of the needle breakage or the like.
1) The patterns for eyelet buttonhole bartacking are from No. 11 to No. 13.
2) When the material closing operation is performed, the maximum sewing size is 3x7mm. Set the most
appropriate size using the enlargement/reduction function. As for the way of operation for setting, checking
or changing the sewing pattern, refer to the item “Operation of the sewing machine (basic)” described in
the instruction material for the LK-1900A.
After setting, check the needle entry point whether or not the needle interferes with the work
clamp foot.
Pattern No. Number of stitches
11
12
13
Sewing size (mm)
Lengthwise
2.5
2.5
2.5
Crosswise
6
6
6
21
28
36
Sewing size is the dimension when
the enlargement rate is 100%.
− 62 −
Page 66
蠱 . EXPLANATION OF THE LK-1902A, COMPUTER-CONTROLLED HIGH-
SPEED BELT-LOOP ATTACHING MACHINE
1. Specifications
Different specifications from those of the LK-1900A only are described.
1) Sewing speed ..............................................Max. 3,000rpm
2) Needle ......................................................... DPx5 #14, #16
3) Lifting method of the work clamp foot .......... Stepping motor
4) Lift of the work clamp foot ........................... Max. 17mm
5) Number of standard patterns ....................... 6 patterns
6) Wiper method .............................................. Interlocked with work clamp foot lifter driven by stepping
motor
2.
Installation of the sewing machine and preparation of the operation
WARNING :
Be sure to perform the work with two persons or more when moving the sewing machine.
Control box
Operator
WARNING :
Tilt slowly the sewing machine head until it hits against the machine head support bar when tilting the
sewing machine head.
3. Threading the machine
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
1) The standard installing position of the belt-loop
attaching machine should be lateral on the table.
2) Install the control box the same as the longitudinal
installation.
3) Use the extension cord packed in the machine head
box to connect the control box with the machine
head.
Thread the machine in the order as illustrated in the
left figure. Leave thread of approximately 4 cm after
passing through the needle.
笊
For a thick thread, pass the thread
through only one of the two holes in
needle bar thread guide 笊 .
− 63 −
Page 67
4. Selection and confirmation of the sewing patterns
WARNING :
In case of using an exclusive work clamp foot, make sure of the shape of the sewing pattern. If the
sewing pattern extends outside the work clamp foot, the needle interferes with the work clamp foot
during sewing, resulting in the danger of the needle breakage or the like.
1) The patterns for the belt-loop attaching are from No. 17 to No. 22.
As for the way of operation for setting, checking or changing the sewing pattern, refer to the item “Operation
of the sewing machine (basic)” described in the instruction manual for the LK-1900A.
After setting, make sure of the needle entry point whether or not the needle interferes with
the work clamp foot.
* The calling has been set to ineffective at the time of delivery since the needle interferes with the standard
work clamp foot which has been provided with the machine. When using this function, use “Setting the
pattern data calling effective or ineffective” of the memory switch function to make the calling effective. As
for the way of operation for setting, refer to the item “How to use the memory switch” described in the
instruction manual for the LK-1900A.
Pattern No.
17
18
※ 19
※ 20
※ 21
※ 22
Sewing size (mm)
Lengthwise
0
0
0
0
0
0
Crosswise
10
10
25
25
25
35
Number of stitches
21
28
28
36
42
42
Sewing size is the dimension when
the enlargement rate is 100%.
5. Combination of the work clamp foot and the feed plate
WARNING :
In case of using an exclusive work clamp foot, make sure of the shape of the sewing pattern. If the
sewing pattern extends outside the work clamp foot, the needle interferes with the work clamp foot
during sewing, resulting in the danger of the needle breakage or the like.
Make use of the appropriate combination of the work clamp foot and the feed plate in accordance with the sewing
conditions. The combination for the standard delivery and the special order is shown in the following table.
Work clamp footSpec
Part No.
10
14143002
LK-1902A
Standard
Feed plate
17
2
7
Part No.
13544465
For large size
(Special order part)
For extra large size
(Special order part)
37
27
2.4
2.4
7
7
− 64 −
Part No.
13545660
Part No.
13547161
24.8
27.4
37
37.4
10
2.8
2.8
Part No.
13545504
Part No.
13545801
Part No.
13547005
Page 68
蠶 . EXPLANATION OF THE LK-1903A, COMPUTER-CONTROLLED HIGH-
SPEED LOCKSTITCH BUTTON SEWING MACHINE
1. Specifications
Different specifications from those of the LK-1900A only are described.
1) Sewing speed .............................................. Max. 2,700rpm
2) Needle ......................................................... DPx17 #14
3) Lifting method of the work clamp foot .......... Stepping motor
4) Lift of the work clamp foot ...........................Max. 13mm
5) Number of standard patterns ....................... 50 patterns
6) Wiper method .............................................. Interlocked with work clamp foot lifter driven by stepping
motor
* The needle thread clamp device is set to prohibition (state of standard delivery) with memory
switch No. 35. Refer to 6. Thread clamp device of [5] OPERATION OF THE SEWING MACHINE
(BASIC).
2.
Installation of the sewing machine and preparation of the operation
WARNING :
Be sure to perform the work with two persons or more when moving the sewing machine.
1) Installation of the sewing machine head and the
Set of button
tray base
control box is the same as that of the LK-1900A.
Refer to the instruction manual for the LK-1900A.
2) Install a set of the button tray base to a convenient
place for the work as the set is included in the
accessories.
3) The way of operation is the same as that of the
LK-1900A.
Make sure before operation that the
needle does not strike against the button
hole.
3. Needle and thread
Needle Needle thread
#60
DPx17 #14
#60
#50
#40
Bobbin thread
#80
#60
#60
#60
Needle and thread will vary in accordance with the
sewing conditions. When using the needle and the
thread, select them referring to the left table. Cotton
thread and polyester spun thread are recommended.
− 65 −
Page 69
4. Various sewing modes
(1) List of sewing patterns
Number of threads and standard sewing size of X and Y are as shown in the following list.
< Sewing program list >
Pattern
No.
1 • 34
2 • 35
3
4
5 • 36
6 • 37
7
8
Stitch
shape
Number
of threads
(thread)
6-6
8-8
10-10
12-12
6-6
8-8
10-10
12-12
Standard
sewing size X
(mm)
Standard
sewing size Y
(mm)
Pattern
No.
18 • 44
19 • 45
20
21
22
23 • 46
24
25
Stitch
shape
Number
of threads
(thread)
6
8
10
12
16
6
10
12
Standard
sewing size X
(mm)
3.4
0
Standard
sewing size Y
(mm)
0
3.4
9 • 38
10 • 39
11
12 • 40
13 • 41
14
15 • 42
16 • 43
17
6-6
8-8
10-10
6-6
8-8
10-10
6-6
8-8
10-10
3.4
3.4
26 • 47
27
28 • 48
29
30 • 49
31
32 • 50
33
6-6
10-10
6-6
10-10
5-5-5
8-8-8
5-5-5
8-8-8
3.4
3.0
3.4
2.5
* The standard sewing sizes of X and Y are when the enlargement / reduction rate is 100%.
Use the pattern No. 34 to No.50 when the button hole is small (ø1.5 mm or less).
− 66 −
Page 70
(2) Selection of the sewing pattern and the sewing width
™ Selection of the sewing pattern is the same as that of the LK-1900A.
™ When the distance between holes of the button used does not fit the standard sewing width of the sewing
pattern No., adjust the sewing width by enlarging/reducing the sewing width.
The way of enlarging/reducing is the same as that of the LK-1900A. Refer to the table given below for the
scale for enlargement/reduction in terms of the sewing width.
™ After changing the sewing pattern No. and the sewing width, make sure of the needle entry point.
As for the way of confirmation, refer to the confirmation of the shape of sewing pattern in the instruction
manual for the LK-1900A.
◎ Table of XY scale in terms of the sewing width
X•Y
(mm)
2.4 2.6 2.8 3.0 3.2 3.4 3.6 4.0 4.3 4.5 4.7 5.2 5.6 6.0 6.2 6.4
%7176828894100 106 118 126 132 138 153 165 176 182 188
5. Position of the button clamp jaw lever
WARNING :
When change of the shape of button, change of the sewing pattern or enlargement/reduction of the
sewing width is performed, make sure the needle entry point. If the needle extends outside the button
hole or the sewing pattern extends outside the button clamp unit, the needle interferes with the button
hole or the button clamp unit, resulting in the danger of the needle breakage or the like.
笊
Needle entry point
Button
Hole in the button
笆
1) Press key in the state that the swing LED goes
off using the operation panel.
2) Press key. /
3) Press key. The button clamp unit goes to
the origin position and goes up.
4) Place a button in button clamp jaw levers 笊 .
5) Depress the pedal to the first step and detach your
foot from the pedal when the button clamp unit
comes down.
6) Turn the hand pulley and check that the center of
the needle enters the center of the button.
7) If the center of the needle is not located in the center
of the button, loosen screws 笆 in the button clamp
jaw lever base to adjust so that the center of the
needle enters the center of the button.
8) When depressing the pedal to the second step at
step 5), the button clamp unit moves again to the
origin position. In addition, when the button clamp
unit comes down, depress the pedal to the first step
and detach the foot from the pedal. Then the button
clamp unit goes up.
9) After the adjustment, perform the confirmation of
the pattern shape and make sure that the needle
surely has entered the button hole.
− 67 −
Page 71
6. Adjusting the feed plate
WARNING :
When change of the shape of the button, change of the sewing pattern or enlargement/reduction of the
sewing width is performed, make sure of the shape of the sewing pattern. If the feed plate interferes with
the needle hole guide, it will result in the danger of the needle breakage or the like. Also, if the pedal is
depressed during the adjustment, the button clamp unit will go up or come down. So, be careful.
笆
笊
7. Adjusting the button clamp jaw lever
1) Press key in the state that the swing LED goes
off using the operation panel.
2) Press key. /
3) Press key. The button clamp unit goes to
the origin position and goes up.
4) Adjust feed plate 笊 so that needle hole guide 笆
comes to the center of the recessed part of feed
plate 笊 .
笘
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Bring the machine to its stop-motion state. Then lift
button clamp 笊. Loosen screw 笆 in the button clamp
jaw lever and adjust so that a clearance of 0.5 to 1
mm is provided between button clamp jaw lever 笳 and
hinge screw 笘 when placing a button in between button
clamps 笊. Then tighten screw 笆 in the button clamp
jaw lever.
笊
笳
0.5mm to 1mm
笆
笊
− 68 −
Page 72
8. Adjusting the lifting amount of the button clamp
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
w
B
Max. 13mm
A
q
Loosen two setscrews q, and move moving plate w back and forth in the direction of arrow to adjust. The lifting
amount of the button clamp will be decreased when moving plate w is moved in the direction of A, and be
increased when it is moved in the direction of B. After the adjustment, securely tighten setscrews q.
9. Adjustment of the pressure of the work clamp unit
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
w
q
The pressure of the work clamp unit should be minimized as long as the material does not warp during
sewing. Loosen adjusting screw q and turn adjusting screw w to obtain the aforementioned pressure.
− 69 −
Page 73
10. Adjustment of the wiper spring
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Wiper spring q retains the needle thread after thread
trimming in between wiper w and the wiper spring.
Correct properly the tension of wiper spring q so that
the tension at that time becomes 20 to 30 g (a little
higher tension than that of the bobbin thread coming
out of the bobbin case).
w
q
11. Installing the save button bar (accessory part)
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
1) Install save button bar e on button clamp base q
with hexagon screw w.
2) Adjust so that a clearance of 3.5 to 4 mm is provided
between the center of the button and the top end
of the save button bar.
3) To adjust the raising amount of the save button
bar, loosen screw r, and move the save button
bar up or down.
e
r
w
q
If the retaining of the needle thread is
excessive, the thread may protrude from
the upper side of the button.
3.5 to 4mm
− 70 −
Page 74
12. Model classification according to the button size
Model
Button size classification
Outside diameter of applicable buttons (mm)
Sewing size (mm)
Button clamp jaw lever
Needle hole guide
Feed plate
Length
Width
Thickness (mm)
Part No.
Right
Left
LK-1903A-301
For small-sized buttons
ø10 to ø20
0 to 3.5
0 to 3.5
2.2 (2.7)
MAZ155070B0 B
(MAZ156070B0) C
MAZ155080B0 B
(MAZ156080B0) C
MAZ15501000
MAZ15502000
※
LK-1903A-302
For medium-sized button
ø10 to ø20
0 to 4.5
0 to 4.5
2.7 (2.2)
※
MAZ156070B0 C
(MAZ155070B0) B
MAZ156080B0 C
(MAZ155080B0) B
MAZ15601000
MAZ15602000
The part in parentheses are those to be specially orderd. ※ Engraved marker
− 71 −
Page 75
13. Attaching the shank botton (optional)
(1) Specifications
Model
Needle
Shape of button
Optional
TQx3 #14
Outside diameter
Diameter of hole
Position of hole
Shape of shank section
Max. ø20
Min. ø1.5
t
RR
R
RR
1.5 mm or more
t
Minimum
1
3
5
4
3
–
R(mm)
Maximum
9
8
7
Sewing speed
Stitch shape
As for the dimensions of the shape of shank section,
reder to the above table for reference.
Max. speed of the pattern data is limited to 2,700 rpm. However, set it to 1,500 rpm
for the shank button.
Sewing pattern program No.18 to No.22
(Refer to the sewing program list on page 66.)
− 72 −
Page 76
(2) Adjusting the height of the needle bar
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
q
w
e
A
4.3mm
1) Loosen needle bar connection screw q and move the needle bar w up or down so that second engraved
marker line A as counted from the bottom is aligned with the bottom end of needlebar bushing e when
turning the hand pulley to bring the needle bar to its lowest position. Then further raise only the needle
bar by 4.3mm, and tighten needle bar connection screw q.
2) Attach the needle (TQx3 #14).
(3) Adjusting the feed plate base
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
q
Center
w
Adjust so that the slot of feed plate q becomes the center of the boss section of the needle hole guide, and
tighten setscrew w.
When the sewing state between the button and the material is loose, replace feed plate q
with the feed plate B to obtain a stronger sewing state. At this time, however, the outside
diameter of the button is limited to max. ø19. So, be careful.
− 73 −
Page 77
(4) Adjusting the button clamp support
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
笳
笆
笊
笘
(5) Checking the needle entry point
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Second
stitch
Allow the needle to come as near as the
left side of the button hole without
striking the button hole.
Loosen setscrew 笊 , and place the button to be used in
between the button clamps. Then determine the longitudinal
position of the button hole and the slot of button clamp base
笘 by moving button clamp support, front 笆 and rear 笳
back and forth. Then securely tighten the setscrew. At this
time, if the clearance between button clamp support, front
笆 and rear 笳 is a little smaller (approx. 0.5mm) than the
outside diameter of the button to be placed, the button is
securely clamped.
笊
When checking the shape of the sewing pattern, fit the second stitch of the needle entry to the button hole, and tighten
screw 笊. (Refer to the item of checking the shape of the sewing pattern in the instruction manual for the LK-1900A.)
(6) Adjusting the button clamp base and the feed plate
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
笘
笊
X
笳
1)
As for the attaching height of button clamp base 笊 , adjust the vertical position so that the bottom face of the button
笊
笆
clamp base and the top face (knurl face) of feed plate A 笆 can equally press the material. Then tighten setscrew 笳 .
2) Adjust the position X (protrusion of the material), position of feed plate A 笆 against button clamp base 笊, according
to the thickness of the material using setscrew 笘 . The standard adjustment value is 0.5 mm.
0.5mm
− 74 −
Page 78
(7) Adjusting the button support rubber
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
q
e
w
(8) Adjusting the button support link
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
To adjust the position of button support rubber asm.
q, loosen setscrews w and e, and adjust so that the
pressing section of the button support rubber can press
the center of the button at right angles to the button.
Then tighten the setscrews.
q
A
Long slit
B
w
e
Loosen screw q, and move button support link w in the direction A to make early the opening of the button
support rubber when button clamp attaching base e goes up. Move it in the direction B to retard the
opening of the button support rubber. The standard adjustment is to adjust so that the button support rubber
starts opening when button clamp attaching base e has gone up by 1 mm.
− 75 −
Page 79
5. DRAWING OF THE TABLE
290
±0.5
637
199
810
75
513
1046
1130
1200
148
133.5
115
50270
38
256
50
488
411
50
21
40
175.6
158.8.
30.5
85
25
40
ø26
ø26
ø8.5 ø8.5
ø36
ø16
6
10
110
418.6
42
360
570
390
306
139.5
120
257
263.5
48.7
158
50
35
283
371
±0.5
500
75.5
±0.5
151
±0.5
259.8
□8
□81
1
25
R30
R30
4-R10
R30
R30
R10
R30
R30
R10
ø30
Y
Y
Z
Z
(1) Longitudinal installation type table (Part No. 40006886)
!3
!3
!1
q
w
r
t
u
o
!4
!2
y
i
!0
e
q 4- drilled hole 2, 10 deep on the rear side (Stand installing hole)
w Drawer stopper installing position One place on the rear side
e JUKI logotype
r 4- drilled hole 8
t Drilled hole 30, 51 spot face 16 deep
y Oil drain funnel installing hole
u 3- drilled hole 7, 6 deep
Z-Z Y-Y
i Drilled hole 8
o Drilled hole 9, 20 spot face 17 deep
!0 2- drilled hole 2, 10 deep on the rear side (Power switch installing hole)
!1 Drilled hole 17
!2 Drilled hole 28
!3 R2 (all corners)
!4 Right side
− 76 −
Page 80
(2) Lateral installation type table (Part No. 40006887)
R30
q
w
85
637
824
38297
1130
1200
151±0.5
Y
290
±0.5
42936.5
!3
R30
40
!3
!0
Y
Y
Z
Z
t
!4
±0.5
75.5
y
Y
263.5
u
!1
570
547
390
360
110
R30
40
25
148
158.8
18.5
48.7
10
21
50
199
e
657.5
810
1046
ø38
120
i
r
259.8
257
30.5
175.6
o
4-R10
75
197
!2
155 133.5
R30
500
±0.5
456
283
R2
35
14
10
Z-Z Y-Y (x2)
ø26
1
6
□8
20
ø36
q 4- drilled hole 2, 10 deep on the rear
side (Stand installing hole)
w Drawer stopper installing position
One place on the rear side
e JUKI logotype
r Drilled hole 8
t Drilled hole 9, 20 spot face 17 deep
y 4- drilled hole 8
u Drilled hole 30, 51 spot face 16 deep
i Oil drain funnel installing hole
o 3- drilled hole 7, 6 deep
!0 Drilled hole 17
!1 Drilled hole 28
!2 2- drilled hole 2, 10 deep on the rear
side (Power switch installing hole)
!3 R2 (all corners)
!4 Right side
ø8.5
ø16
− 77 −
Contents
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