Highlead GC20688-1-D User Manual
Purchasing
Copy
Dept
HIGH
LEAD
GC20688-1-D
1-Needle Compound-feed Lockstitch Machine
Trimmer
With
Thread
Instruction
Parts
SHANGHAI HUIGONG
N0.3
Catalog
SEWING MACHINE FACTORY
Manual
----- CONTENTS -----
1.
PRECAUTIONS
1)
Safety precautions······································ ........................................................................................... 1
2) Precaution before Starting Operation ............................................................................................... 1
3) Precaution for
2.
SPECIFICATIONS· ..................................................................................................................................... !
3.
PREPARATION
BEFORE
Operating
BEFORE
STARTING OPERATION········································································ 1
Conditions ................................................................................................ 1
STARTING TO OPERATE ....................................................................... 2
1) Connection
2) Oil
3)
4)
5) Lubrication ............................................................................................................................................ 4
4.
HOW TO USE
1) Threading ............................................................................................................................................... 5
2)
3) Adjusting of
4) Winding the lower
5) Threading the lower
6) Adjusting the lower-thread tension .................................................................................................... 6
7)
8) Alternating presser foot movement
9) Adjusting the
10) Adjusting the stitch length ................................................................................................................... 7
11) Using the manual switches··· ................................................................................................................ 7
12) Cleaning·············· .................................................................................................................................... 8
13) Lubrication ............................................................................................................................................ 8
14) Adjusting the trailing length after thread trimming ....................................................................... 9
15) Back
16) Adjusting the feed dog .......................................................................................................................
17) Adjusting the needle
18) Adjusting the gap between the needle
19) Adjusting of the needle
20) Hook protection·......... . .................................................. · ..................................
21)
22) Adjusting the
23) Adjusting the presser foot height .....................................................................................................
24) Adjusting the alternating presser foot movement
25) Adjusting the presser foot timing .............................................................
26) Adjusting the fixed knife position
27) Adjusting the
28) Adjusting the knife timing position
29) Adjusting the driving knife height .................................
30) Adjusting the driving knife stop positiow · ................................................
pan
Operation panel·························· ........................................................................................................... 3
Adjusting the needle stop position ..................................................................................................... 3
Adjusting of the
Installing the needle .............................................................................................................................. 6
Adjusting the needle
of
control box .................................................................................................................... 2
.................................................................................................................................................... 3
THE
upper
tacking'"
MACHINE
thread
thread
thread
thread
presser
foot pressure ................. ................................................................................ 7
....................................................................................................................................... 9
bar
and
opener
thread
position ............................
holding spring position ..........................................................................
............................................................................................................... 5
regulator······ ................................................................................................. 5
tension................................................................................................... 5
.................................................................................................................... 5
................................................................................................................. 6
amount
..................................................................................... 6
height ........................................................................................................ 10
and
the
rotary
and
the hook timing ...........................................
feed mechanism timing ...................... · ......
,.
..
· ............................................... 16
hook tip ................................................... 10
,.
......................................
..
.....
. ............................... ·
..........................
amount
oc
.... • ...........................................................
,.
................................................. 12
...........................................................
.,
.....................................
10
ll
11
··11
13
13
15
15
16
16
16
31) Adjusting the driving knife operating position ..............................................................................
32) Adjusting the thread trimming timing ............................................................................................
33) Safety clutch· ........................................................................................................................................
----- PARTS LIST -----
17
18
18
A.ARM BED
B.
THREAD TENSION REGULATOR MECHANISM .......................................................................................
C.SEWING MECHANISM .......................................................................................................................................
D.PRESSER FOOT MECHANISM ........................................................................................................................
E. UPPER FEED LIFTING
AND
ITS ACCESSORIES ................................................................................................................
ROCK
SHAFT MECHANISM ...............................................................................
20
23
26
29
33
F.STITCH REGULATOR MECHANISM ............................................................................................................. 36
G.FEEDING
H.HOOK SADDLE MECHANISM ........................................................................................................................
I.OIL LUBRICATION MECHANISM ...................................................................................................................
J.ACCESSORIES .......................................................................................................................................................
K.PNEUMATIC CONTROL UNIT ........................................................................................................
AND
FEED LIFTING & ROTATING HOOK SHAFT MECHANISM .................................... 39
42
46
49
0
...............
51
1.
PRECAUTIONS BEFORE STARTING OPERATION
1)
Safety precautions
(1) When turning the power on, keep your hands and fingers away from the area around/under the needle
and the area around the pulley.
(2)
Power must be turned off when the machine
off
(3) The power must be turned
when replacing.
(4) Avoid placing fingers, hairs, bars etc. nears the pulley, bobbin winder pulley, when the machine
operation. Injury could result.
(5) Do not insert fingers into the thread take-up cover, under/round the needle,
is
machine
(6)
If
a mini motor cover, finger guard, and/or eye guard are installed, do not operate the machine
without these safety devices.
2)
Precaution before starting operation
(
1)
If
the machine's oil pan has an oil sump, never operate the machine before filling it.
(2) If the machine
(3) When a new sewing machine is first turned on, verify the rotational direction
power on. (The pulley should rotate counterclockwise when viewed from the pulley.)
(4) Verify the voltage and (single
in operation.
is
lubricated
before tilting the machine head, installing or adjusting the machine, or
by
a drop oiler, never operate the machine before lubricating.
or
three) phase with those given on the machine nameplate.
is
not used, or when the operator leaves his/her seat.
or
pulley when the
~
of
the pulley with the
is
3)
Precaution for Operating Conditions
(I)
Avoid using the machine at abnormally high temperature (35"C or higher) or low temperatures
or lower). Otherwise, machine failure may result.
(2) Avoid using the machine in dusty conditions. Avoid using the machine in areas where too much
electrical noise, resulted from the high-frequency welder and others, is generated
2.
SPECIFICATIONS
Item
Max. Speed
Stitch length
Needle bar stroke
Presser foot
clearance
Needle
Rotating hook
Presser foot alternation
By hand
By knee
Specifications
3,500rpm
0-9mm
34mm
9mm
16mm
DPX
17
#18-#25
Large vertical hook
l-7mm
(1. 6 times)
(5"C
Auto presser foot lifter
lubrication method
Oil
Bed
dimensions
Pneumatic
Automatic lubrication
300X
120 mm
-1-
3. PREPARATION
BEFORE
STARTING
TO
OPERATE
1) Connection
It shows the connection
electrical wires
of
control box
of
the whole machine
of
the
on the right picture.
When the machine needs to be
assembled, each line should be linked
to the right joint according to the
instruction
of
the picture.
All the pins on the control box
of
have signals
function showing,
and usually, different wires have
of
different kinds
joint.
windpipe
windpipe
synchronizer
wires
to
windpipe
signal I ine
synchronizer
pedal
of
of
wire
~,~~
control
of
MR
STK
box
motor
wire
windpipe
of
HP
Wires
of
wires
solenoid
from connection board
power
output
wires
from
the
motor
int
of
lenoid wire
pipes
from
solenoid
input
I i ne
Caution:
wire
external pins and
the pin
is
the same with another two
of
synchronizer
if
there
is
misconnection, the synchronizer
might be bum.
When connecting the pipes, please
of
check the joint at the picture
the whole
machine above as reference.
And also there have an instruction
of
mark
each joint
of
the solenoid at the
setting board.
a
control
connection
signal I ine
back
stitches----~------
(MR)
panel
of
connection
tack
board
stroke
changing
(HP)
I
ift
denseness
2
stitches(STK)
2) Oil
pan
(1) Install the oil pan 3 to the underside
worktable 1 in the place shown in the illustration
using the nails
(2) From front view, the oil pan 3 to the side is
60mm; from right view, the oil pan 3 to the side is
80mm.
2.
of
the
3
60mm
3)
Operation
(1) Install the operation panel 1 to the
set plate 2 with the three screws 3.
(2) Install the set plate 2 to the back
the machine arm with the two screws
4)
Adjusting
(
1)
Adjusting the needle
When the sewing machine stops
treadle
Adjust as follows:
is
panel
the
needle
pressed back, the red mark on the pulley should be consistent with the mark on the belt cover A.
stop
position
up
stop position
of
4.
in
the needle
up
stop position (the stop position
of
trimming) and the
a.
Turn
off
the power switch.
b.
Loosen the screw
4.
and then remove the cover
3.
,.,
.)
c.
When the red mark stops in a position over the mark on the belt cover, the needle up stop position disc 1
of
should be turned in the opposite direction as the direction
in a position under the mark on the belt cover, Turn the disc 1 in the same direction as the pulley rotation
direction.
machine pulley rotation. When the red mark stops
5
(2) Adjusting the needle down stop position
in
When the sewing machine stops
consistent with the mark on the belt cover
a.
Tum
off
the power switch.
b.
When the black mark stops
in
disc 2 should be turned
mark stops in a position under the mark on the belt cover, Tum the disc 2
rotation direction.
c.
After adjusting, install the cover 3, with screw
Note:
There
is
no need to loosen the screw 5, when
5)
Lubrication
Before the new machine is used, please loosen the screw 2
and full the oil into the oil case. Set the oil level between
"EMPTY" and "FULL". Then replace oil-filling screw
the opposite direction as the direction
the needle down stop position, the black mark on the pulley should be
A.
Adjust as follows:
in
a position over the mark on the belt cover, the needle down stop position
of
machine pulley rotation. When the black
4.
turning
2.
the discs.
in
the same direction as the pulley
2
-4-
4.
HOW
1)
Threading
Raise the thread take-up lever to its highest position and thread the upper thread in the following order.
TO
USE
THE
MACHINE
2) Adjusting
The thread regulator 9 (see the right
picture) regulates the amount
thread necessary for stitch formation. The
setting depends on the following factors:
material thickness, yarn characteristics and
stitch length.
The thread regulator
for this purpose. Moving
increases the quantity
Moving
quantity
3) Adjusting
Tension should be as low
thread tension can be adjusted
of
the
thread
in
the "-"direction reduces the 1
of
needle thread.
of
upper
regulator
of
is
fitted with slots
in
the "+"direction
of
needle thread;
thread
tension
as
possible. The crossover point should be
by
thread tension nut 4 and 5 (see the picture
needle
10
9
8
?--------1'
in
the center
of
above). Tum the thread tension
of
the material. Upper
5
nut clockwise to increase the needle thread tension. Tum the thread tension nut counter-clockwise to decrease
the needle thread tension.
0
X
X
L.. /,&)
?~~.,dE.GJI.
~
4)
Winding the lower
(I)
(2)
shown
clockwise around the bobbin several times.
bobbin.
when winding
wound onto the bobbin should be a maximum
80%
in
(3)
( 4) The operation will automatically stop
ifthe
~we;;
switch
Place the bobbin onto the bobbin winder shaft.
Pass the thread for winding thread
the figure, and wind the end
Push the bobbin presser I toward ,the
is
completed. The amount
bobbin capacity.
II&
balanced
thread
~~
as
of
the thread
of
thread
of
In
case upper thread
is too strong or
thread
is
too weak
r~---··-cc·~····
lower
c::~
In
case upper thread
is
too weak or lower
thread is too strong
-5-
2
(5) After the thread has been wound
on, remove the bobbin
with the thread-trimming knife 2.
5)
Threading
(1
) Raise flap I
empty bobbin.
(2) Insert
when the thread is
in the opposite direction
(3) Pass the thread through slit 3 and
below spring
slit 4 and pull about 3 em through.
(4) Close flap 1 and pass the thread through the flap's guide 5.
bobbin
6, pass the thread through
and
cut the thread
the
lower
2 in such a way that
unwound
thread
and
remove the
from it moves
to
the gripper.
4
6) Adjusting the lower-thread tension
The lower-thread tension should be set in accordance with the type
with screw 7. (See the picture
7) Installing
the
needle
of
above)
5 6
of
seam required. Adjust the tension
7
2
3
Note: Before the following adjustment,
switch.
Insert the needle up to the bottom
screw
1 keeping the long groove side
8) Alternating
The alternating movement amount for the inner presser
foot and the outer presser foot can be adjusted within the
range
of
1-7 mm using the alternating presser foot movement
1.
dial
clockwise
C, D,
Tum
or
E,
F MAX. )
presser
the alternating presser foot movement dial 1
counterclockwise to align the mark. (MIN. A, B,
foot movement
of
b.e
sure to
of
needle clamp and tighten the
needle forward the left.
tum
amount
off
the power
Long
left
groove
~
..
\
1
-6-
9) Adjusting
The presser foot pressure should be set as
weak
as
possible, but strong enough so that the
the
presser
foot pressure
material does not slip.
dial I
pressure will become stronger, and
counterclockwise, the pressure will become
weaker.
is
turned clockwise, the presser foot
10) Adjusting
The feed adjustment dials 2 and 3 can be
used to set two different types
big stitch length.
between the two stitch lengths each time the stitch length change switch
11)
Using the
(I)
Quick reverse switch
Back tacking is carried out during sewing only
while the switch I is being pressed.
(2) Alternating presser foot movement change switch
manual
If
the presser-adjusting
if
it
is
turned
the
stitch length
1
of
stitch length. (See the picture
Use feed adjustment dial 3 to set the little stitch length. The sewing machine will switch
of
above) Use feed adjustment dial 2 to set the
switches
is
pressed.
2
3
The sewing machine
two different alternating presser foot movement
amounts each time when the switch 2
(3) Auto back tacking select switch
If the switch 3
tacking or end back tacking has been set to
the operation panel, back tacking
when neither starting nor end back tacking has been set, back tacking
( 4) Needle
position or move down to the needle down stop position
(5) Stitch length change switch
is
little stitch length.
up
or down switch
If the switch 4
The stitch length changes alternately between two different stitch length settings each time the switch 5
pressed. OFF: Sewing
can be switched between
is
pressed.
is
pressed when either start back
ON at
is
canceled for the first time only. Furthermore,
is
pressed, The needle will move
is
carried out using the big stitch length; ON: Sewing
up
to the needle
from
up
if
the switch 3
is
carried out for the first time
up
stop position from down stop
stop position.
is
carried out using the
is
pressed
only.
(
6)
Stitch counter switch
on
The orange light
the switch will flash and the machine will stop when the bobbin thread
-7-
is
used
up.
Push the switch one more time after change the bobbin. The sewing machine cannot run before the switch
of
be pushed one more time. The stitch count should be set according to the stitch length and the count
the
bobbin thread.
functions please read the parameter 42, 43, 44 in the servo motor user manual.
Notice: the switch
is
not work until the correlative functions
of
the control box are set. The
12) Cleaning
(1)
The area around the feed dog and the hook should be cleaned every
(2) Remove any thread scraps from inside the rotary hook.
(3) Keep the control box clean.
13)
Lubrication
(1) Check the oil level at the sight glass 1 every week. If the oil is
not enough, remove oil-filling screw 2 and pour in oil. Check
2.
oil level at sight glass
"EMPTY" and "FULL". Replace oil-filling screw
running for
the oil must be changed. Then change the oil every two years.
(2) The oil quantity is pre-set at a relatively high level
ensure adequate lubrication during running-in. This setting should be checked and corrected after
500 hours since buying the new sewing machine,
The oil level must be between
2.
After
in
order to
day.
running-in. (approx.
The hook
lubrication with the least
possible amount
sewing machine run approx.2
minutes. And run in intervals.
Hold a piece
the hook and check
the tube 1 no longer moves. This
is
50 hours).
to have positive
of
oil. Let the
of
paper next to
if
sufficient oil
is
spun oil onto the paper. Remove cover plate
is
the case when the tube
is
in
the center
2.
Loosen screw 3 until
of
the drilled hole. Tum screw 3
-8-
in
until the tube movement just starts and then a
1/8
tum farther. The hook lubrication
is
preset. Attach
cover plate 2 again. Setting the hook lubrication with screw
(3) Lubricating wicks and felt (see the picture
a.
The wick 1 leading from the oil sump to the
oscillating crank 4 must be fixed between the groove 2
in
the arm and the spring 3
b.
When the oil satchel is changed, the flock side should
be faced to connecting plate
should be set between the oil satchel 9 and plate
( 4) Checking the lubrication oil.
Tum on the power switch. Depress the treadle
gently and check that the oil level rises in the oil sight
glass.
14) Adjusting the trailing length
Adjust
tension
lengths
by
turning the pre-tensioner
of
the pre-tension
of
the threads trailing from the needle
of
the recirculation wick.
10.
The oil wick 7 and 8
after
is
increased, the
of
thread
1.
If
the
above)
8.
trimmin
3.
<:\
oi
I
windows
tips will
lengths will be increased.
15)
Back
reverse switch
feed direction will
released, the feed direction will return
normal.
be
reduced;
if
the tension
tacking
When the reverse lever 1 or the quick
is
pressed during sewing, the
be
reversed. When
is
reduced, the
it
long
)
short
is
to
-9-
16)
Adjusting
the
feed dog
Set the feed adjustment dials to the minimum
0.5mm
settings. Then adjust as follows
dog 1 is at its highest position
top
of
the needle plate
its lowest position.
(I)
Tum
the machine pulley to set the feed dog 1
is at its highest position.
(2) Loosen the screw 3.
(3) Adjust the feed
(4) Tighten the screw 3.
17)
Adjusting
Set the feed adjustment dials to the minimum settings. Then
adjust so that the distance from the setting surface
plate
2 to the end
the
of
2)
when the needle
dog's
height.
needle
bar
the needle bar 1 is
so
that the feed
(0.5mm above the
bar
height
I8.5mm
is at
of
the needle
when the
I
needle bar 1 is at its lowest position.
(1) Remove the face plate
(2) Set the feed adjustment dials to
(3)
Tum
the pulley to set the needle bar 1 to its lowest
position.
(4) Loosen the screw 3 and then move the needle bar I up
down to adjust
the needle plate 2 to the end
(5) Tighten the screw 3, install the face plate.
18)
Adjusting
The
Set the rotary
adjusting the gap as follow:
(1) Loosen the screws 2 and 5 (see the picture
(2) Set the hook base 6 to the fit position.
so
that the distance from the setting surface
the
gap
between the needle and the rotary
hook
..
of
gap
between
tip at the level
"0".
the needle bar I
the
needle
of
the middle
is
I8.5 mm.
and
hook
of
below).
tip I
or
of
the
rotary
is
O.I
mm.
of
the needle. Then
hook
tip
0.1 mm
1
(3) Rotate the adjusting plate 3, let the hook base 6 depend on the bed
plate 4.
(4) Tighten the screws 2 and
5.
-
10-
6
2
3
4
5
19) Adjusting
(1) Set the stitch length
(2) Remove the needle plate.
(3) Overturn the arm.
( 4) Loosen the screw 1
(5)
Tum
from its low position to the point that the needle rises
2.4 mm.
(6)
Tum
tip with the center
(7) Tighten the screw I.
of
the needle and the hook timing
to
"0".
the machine pulley to raise the needle
the rotary
hook
of
the needle.
to
align the rotary
bar
hook
20) Hook protection
In
looping stroke position the needle must
protection I without being displaced.
Move needle in looping stroke position by pulley.
abut
.-----------------------------------------,
\
\~
~-~--
on the hook
In
looping
stroke position the
needle. Press needle against hook protection I manually. The 2
needle should not touch the hook tip.
hook
tip
is
at the level
of
the middle
of
the
21) Adjusting the needle and feed mechanism timing
(I)
Horizontal feed direction
Set the feed adjustment dials to the maximum settings. Then turn the machine pulley until the needle bar
at its lowest position. Then adjust so that the needle and the feed dog do not move even when the reverse lever
moved up and
a.
Remove the bed upper cover I .
b.
Set the feed adjustment dial to the maximum settings.
c.
Loosen the two screws
down
at this time.
2.
-]]-
is
is
2
3
d.
Turn the machine pulley until the needle bar
is
at its lowest position.
e.
Turn the lower feed cam 3 gradually until it
at the position where the needle and the feed dog do
is
not move even when the reverse lever
and down.
f.
Tighten the two screws
(2) Vertical feed direction
2.
moved up
is
2
3
Set the feed adjustment dials to the minimum
settings. Then adjust as follows
needle plate 2) when the needle bar
a.
Loosen the two screws 3
b.
Turn the machine pulley to set the needle bar to
its lowest position.
c.
Turn feed cam 4 to align the point 5
of
with the centerline
d.
Tighten the screws 3
22) Adjusting
Adjust so that the clearance between the needle plate 3
and the stopper 4
mm when the opener 1
inner rotary hook 2.
(1) Turn the machine pulley to move the opener I m
feed rod 6
the
opener
of
the inner rotary hook 2
is
so
that the feed dog 1
is
at its lowest position.
of
feed cam 4
position
is
0.5-0.7
at its closest position to the
is
at its highest position (0.5mm above the top
4
s-o.7mm
of
the
direction
screw 5
(2) Turn the machine pulley to move the opener I
direction
"a" (opening direction), and then loosen the
in
"b"
(closing direction), and then loosen the
-
12-
screw
6.
(3) Tum the machine pulley to move the opener 1 as close to the inner rotary hook 2 as possible.
(4) While pressing the opener 1 against the inner rotary hook 2 with your finger, adjust so that the clearance
of
between the needle plate 3 and the stopper 4
(5) Tighten the screw 6.
(6)
Tum
the machine pulley to move the opener 1 in direction
screw
5.
the inner rotary hook 2
is
0.5-0.7 mm.
"a"
(opening direction), and then tighten the
23) Adjusting
The standard height
(
1)
Remove the belt cover.
(2) Loosen the presser adjusting screw, to release the presser foot pressure.
(3) Raise the presser lifters bar 1 and then loosen the screw
( 4) Move the outer presser bar up or down to adjust so that the height
(5) While the stopper pin 6
pushing the presser lifter shaft so that there is no play in the thrust direction, tighten the screw 2.
(6) Tum the presser adjusting screw to adjust the presser foot pressure.
(7) Install the belt guards.
the
presser foot height
of
the outer presser foot 7 is 9
is
touching against the notch B in the presser foot lifter connection 5 and while
7
mm
when it is raised by the presser lifter bar
2.
of
the outer presser foot 7 is 9 mm.
1.
9mm
24) Adjusting the
(I)
Maximum alternating presser foot movement amount. Carry out the following adjustment to set the
maximum alternating movement amounts for the inner presser foot
7mm.
a.
Remove the upper plate.
b.
Remove the adjusting bracket
c.
Loosen screw 5
alternating
of
adjusting bracket collar
presser foot movement
3.
amount
I and outer presser foot 2 to the maximum
4.
-13-
of
d. Adjust the adjusting bracket collar
4.
If
the
adjusting bracket collar 4
is
be installed at the highest
position, the alternating presser foot movement amount
is 1-6mm.
if
it is at the lowest position, the alternating
presser foot movement amount is 1.6-7mm.
e.
Tighten the screw
f.
Install the adjusting bracket
d.
Loosen the bolt 6 and
adjust so that the distance from the outer edge
arm to the outer edge
5.
of
the pin 7
3.
tum
connecting lever 7 to
is
78
mm
at this time.
of
the
Then tighten the bolt 6. (When installing the upper
plate, set the alternating presser foot movements dial to
the "min." position.)
3
Maximum7mm
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4
5
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(2) Inner presser foot 1 and outer presser foot 2 movement amounts. Carry out the following adjustment to make
the movement amounts for the inner presser foot and outer presser foot 2 equal when the presser feet are
lowered and the machine pulley
a.
Set the feed adjustment dials to the maximum
is
turned. 3
settings.
b.
Open the cover 4
c.
Tum the alternating presser foot movement dial to
the "B" position.
d.
Loosen the screw 3
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!J-
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