Brother BAS-342F, BAS-341F, 342Fi User Manual
INSTRUCTION MANUAL
BAS-341F
BAS-342F
Please read this manual be fore maki ng using the machine.
Please keep this manual within easy reach for quick reference.
PROGRAMMABLE ELECTRONIC PATTERN SEWER
Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please read the safety
instructions below and the explanations given in the instruction manual.
With industrial se wing m ac hines, it is nor m al to c arr y out work while pos itioned direc tl y in f ront of m oving par ts such as
the needle and thread tak e-up lever, and consequently there is always a danger of injury that c an be caused b y these
parts. Follow the instructions from training personnel and instructors regarding safe and correct operation before
operating the machine so that you will know how to use it correctly.
SAFETY INSTRUCTIONS
1
Safety indications and their meanings
This instruction m anual and the indications and s ymbols that are used on the m achine itself are provided in ord er to
ensure safe operation of this m achine and to preven t acciden ts and injur y to yours elf or other peopl e. The m eanings of
these indications and symbols are given below .
Indications
Symbols
DANGER
CAUTION
........................................This symbol ( ) indicates something that you should be careful of. The
........................................This symbol (
........................................This symbol ( ) indicates something that you must do. The picture
(For example, the symbol at left means “you must make the ground
The instructions which f ollow this term indicate s ituations where fail ure to fol low the
instructions will almost certainly result in death or severe injury .
The instructions which f ollow this term indicate s ituations where fail ure to follo w the
instructions could cause injury when using the machine or physical damage to
equipment and surroundings.
picture inside the triang le indicat es the n ature of the caution tha t m ust be
taken.
(For example, the symbol at left means “beware of injury”.)
) indicates something that you must not do.
inside the circle indicates the nature of the thing that must be done.
connection”.)
i
BAS-341F, 342F
2 Notes on safety
g
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Wait at least 5 minutes after turning off the power switch and dis connec ting the power cord from the wall ou tlet
before opening the face plate of the contr ol box. Touching areas where high voltages are present can result in
severe injury.
DANGER
CAUTION
Environmental requirements
Use the sewing machine in an area which is fr ee
from sources of stron
high-frequency welders.
Sources of stron
problems with correct operation.
Any fluctuations in the power supply voltage
should be within 10% of the rated voltage for
the machine.
Voltage fluctuations which are greater than this
may cause problems with correct operation.
The
ower supply capacity should be greater than
the requirements for the sewing machine’s
electrical consumption.
Insufficient
problems with correct operation.
The
reater than the requirements for the sewin
machine's total air consumption.
Insufficient
cause problems with correct operation.
ower supply capacity may cause
neumatic delivery capability should be
neumatic delivery capability ma
electrical noise such as
electrical noise may cause
Installation
Machine installation sh ould only be carried out b
a qualified technician.
Contact your Brother dealer or a qualified electrician
for any electrical work that may need to be done.
The sewing machine weighs more than 200 kg.
The installation should be carried out b
more people.
Do not connect the
com
lete, otherwise the machine m ay operate if
the foot switch is depressed by mistake, which
could result in injury.
Hold the machine hea d with bot h ha nds b
more
original position.
Furthermore, after tiltin
do not
from above, as this could cause the machine head
to to
or damage to the machine.
Be sure to connect the
connection is not secure, you run a high risk of
receiving a serious electric shock, and problem s
with correct operation may also occur.
le when tilting it back or returning it to its
ush the face plate side or the pulley side
le over, which may result in personal injur
ower cord until installa tion is
back the machine head,
round. If the ground
two or
two or
The ambient temperature should be within the
range of 5 to 35
eratures which are lower or higher than this
Tem
may cause problems with correct operation.
The relative humidit
45% to 85% durin
should occur in any devices.
Excessivel
formation may cause problems with correct
operation.
Avoid exposure to direct sunlight during use.
Ex
osure to direct sunlight may cause problems
with correct operation.
In the event of an electrical storm, turn off the
ower and disconnect the power cord from the
wall outlet.
Li
htning may cause problems with correct
operation.
Install the belt cover and the fram e side cover to
the machine head and motor.
If usin
casters should be secured in such a wa
they cannot move.
Be sure to wear
when handling the lubricating oil and grease, so
that they do not get into your eyes or onto your
skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the
under any circumstances, as they can cause
vomiting and diarrhoea.
Keep the oil out of the reach of children.
dry or humid environm ents and dew
a work table which has casters, the
during use.
should be within the range of
use, and no dew formation
rotective goggles and gloves
so that
rease
BAS-341F, 342F
ii
CAUTION
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Sewing
This sewing machine should only be used by
operators who have received the necessary
training in safe use beforehand.
The sewin
applications other than sewing.
Be sure to wear
machine.
If goggles are not worn, there is the d anger that if
a needle breaks,
enter your eyes and injury may result.
Set the needle to the needle u
before turning off the power.
If this is not done, the wi
which might cause the needle to break.
Turn off the power switch at the following times,
otherwise the machine ma
switch is depressed by mistake, which could result
in injury.
• When replacing bobbin
• When not usin
the machine unattended
machine should not be us ed for an
rotective goggles when using the
arts of the broken needle ma
stop position
er may strike the needle,
erate if the foot
the machine and when leavin
Cleaning
Turn off the power switch before carrying out
cleaning, otherwise the machine may operate if
the foot switch is de
could result in injury .
ressed by mistake, which
If using a work table which has casters, the
casters should be secured in such a way so that
they cannot move.
Attach all safet
machine. If the machine is used without these
devices attached, injury may result.
Do not touch an
objects against the machine while se wing, as this
ma
result in personal injury or damage to the
machine.
If an error occurs in machine o
noises or smells are noticed, immediatel
ower switch. Then contact your nearest Brother
dealer or a qualified technician.
If the machine develo
nearest Brother dealer or a qualified technician.
Be sure to wear protective goggles and gloves
when handlin
that the
skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease
under an
vomiting and diarrhoea.
Keep the oil out of the reach of children.
do not get into your eyes or onto your
devices before using the sewin
of the moving parts or press an
eration, or if abnormal
turn off the
s a problem, contact your
the lubricating oil and grease, so
circumstances, as they can cause
Maintenance and inspection
Maintenance and inspection of the sewing
machine should only be carrie d out by a qualified
technician.
Ask your Brother dealer or a qualified electrician to
carry out any maintenance and inspect ion of the
electrical system.
Turn off the power switch and disconnect the
power cord from the wall outlet at the following
times, otherwise the m achine may operate if the
foot switch is depress ed by mistake, which coul d
result in injury.
• When carrying out inspection, adjustment and
maintenance
• W hen replacing consumable par ts such as the
rotary hook
Disconnect the air hoses from the air supply and
wait for the needle on the pres sure gaug e to dr op
to “0” before carrying out inspection, adjustment
and repair of any parts which use the pneumatic
equipment.
If the power switch and air need to be left on when
carrying out some adjustment, be extremely
careful to observe all safety precautions.
Hold the machine head with b oth h ands by two or
more people when tilting it back or returning it to its
original position.
Furthermore, after tiltin g back the machine head,
do not push the face plate s ide or the pulle y side
from above, as this could cause the machine head
to topple over, which may result in personal injury
or damage to the machine.
Use only the proper replac em ent par ts as
specified by Brother.
If any safety devices have been removed, be
absolutely sure to re- install them to their original
positions and check that they operate correctly
before using the machine.
Any problems in machine operation which result
from unauthorized modifications to the machine
will not be covered by the warranty.
iii
BAS-341F, 342F
3 Warning labels
3
f
The following warning labels appear on the sewing machine.
Please follow the instructions on the lab els at all times when using the m achine. If the labels have been
removed or are difficult to read, please contact your nearest Brother dealer.
1
Be sure to connect the ground. If the ground connection is not secure, you run a high risk o
receiving a serious electric shock, and problems with correct operation may also occur.
Thread take-up cover
2
Safety devi ces
Eye guard
Finger guard
Thread take-up cover
Belt cover , etc.
Eye guard
Finger guard
Belt cover
1971S
BAS-341F, 342F
iv
CONTENTS
1. NAME OF MAJOR PARTS
2. SPECIFICATIONS
3. PREPARATION
3-1. Before se ttin g up
3-2. Positioning
3-3. Tilting the sewing machine head
3-4. Connecting the ground wire
3-5. V-belt tension
3-6. Installing the foot switch
3-7. Installing the spool stand
3-8. Installing the programmer (option)
3-9. Adjusting the air pressure
..............................................................................................................................................................3
.........................................................................................................................................................................4
.....................................................................................................................................................................5
4. LUBRICATION
4-1. Lubrication points
.............................................................................................................................................................8
5. CORRECT USE
...........................................................................................................................................2
..................................................................................................................................................3
..................................................................................................................................4
...........................................................................................................................................5
...............................................................................................................................................5
................................................................................................................................................6
...............................................................................................................................................7
......................................................................................................................................................8
...................................................................................................................................................9
.................................................................................................................... 1
...............................................................................................................................6
5-1. Selecting the needle and thread ...................................................................................................................
5-2. Installing the needle and urnnin g the sew ing mac hine..................................................................................
5-3. Threading the upper thre ad ........................................................................................................................
5-4. Windin g th e l ow e r th rea d ............................................................................................................................
5-5. Replacing the bobbin case and th readi ng the thread .................................................................................
5-6. Sewing conditions and thread tensi on ........................................................................................................
5-6-1. Sewing conditions .................................................................................................................................................... 12
5-6-2. Lower thread tension ...............................................................................................................................................13
5-6-3. Upper thread tension ...............................................................................................................................................13
5-6-4. Thread take-up spring height ...................................................................................................................................13
5-6-5. Thread take-up spring tension.................................................................................................................................. 13
5-6-6. Pretension tension .................................................................................................................................................... 14
9
9
10
11
12
12
6. USING THE OPERATION PANEL
6-1. Explanation of panel .................................................................................................................................................... 15
6-2. Using the floppy disk ................................................................................................................................................... 17
6-3. Using the program R/W (Read/Write) switch .............................................................................................................19
6-4. Using the TEST switch (Checking the sewing pattern) ............................................................................................. 20
6-5. Using the emergency stop switch ............................................................................................................................... 21
6-6. Adjusting the sewing SPEED control ....................................................................................................................... 22
6-7. Changing the X-SCALE and Y-SCALE settings ........................................................................................................22
6-8. Using the bobbin thread counter ................................................................................................................................ 23
6-9. Using production counter ............................................................................................................................................ 24
6-10. Using single split mode .............................................................................................................................................25
6-1 1. Shifting a stitch pattern ..............................................................................................................................................26
BAS-341F, 342F
................................................................................................15
7. SEWING
7-1. Before starting sewing....
7-2. Sewing operation
....................................................................................................................................................................27
............................................................................................................................................................27
................................................................................................................................................27
8. MAINTENANCE AND INSPECTION
8-1. Cleaning the shuttle hook
8-2. Lubrication
8-3. Draining the oil
8-4. Cleaning the control box air inlet port
8-5. Cleaning the eye guard
8-6. Checking the needle
........................................................................................................................................................................29
................................................................................................................................................................30
9. STANDARD ADJUSTMENTS
9-1. Adjusting the needle bar height
9-2. Adjusting the needle bar lift amount
9-3. Adjusting the needle clearance
9-4. Adjusting the driver needle guard
9-5. Adjusting the shuttle race thread guide
9-6. Adjusting the movable knife
9-7. Adjusting the presser foot
9-8. Chan gin g th e p resse r foo t l i ft
9-9. Adjusting the wiper
9-10. Adjusting the needle up stop position
9-1 1. Checking th e input senso r and DIP switch inpu t
9-12. Checking the input voltage
9-13. Clearing all memory settings
..........................................................................................................................................................38
.............................................................................................................................................29
.........................................................................................................................30
.................................................................................................................................................31
......................................................................................................................................................31
..........................................................................................................32
....................................................................................................................................32
...........................................................................................................................32
...................................................................................................................................33
...............................................................................................................................33
.....................................................................................................................33
.........................................................................................................................................34
..............................................................................................................................................36
.......................................................................................................................................37
......................................................................................................................38
...................................................................................................39
.........................................................................................................................................40
.....................................................................................................................................40
........................................................................................29
10. DIP SWITCH
10-1. Panel DIP switch functions
10-2. DIP switches inside the control box
.....................................................................................................................................................41
........................................................................................................................................41
.........................................................................................................................43
1 1. CHA NGING SPECIAL FUNCTIONS A ND
USING THE MEMORY SWITCHES
12. ERROR CODES
...........................................................................................................................................50
........................................................................................45
13. GAUGE PARTS LIST ACCORDING TO SUBCLASSES
14. NOTES ON THE PROCESSING AND PRODUCTION
OF PLATE BLANKS
15. TROUBLESHOOTING
16. OPTIONS
..............................................................................................................................................................58
.................................................................................................................................53
..........................................................................................................................54
...............................52
BAS-341F, 342F
1. NAME OF EACH PARTS
1. NAME OF EACH PARTS
BAS-341F
■
Emergency stop switch
Thread wiper switch
Cotton stand
Operation panel
Programmer
BAS-342F
■
Solenoid valve
Integrater
Presser lifter pedal
Power switch
Control box
Starting pedal
1917S
Presser foot
Work cl a mp
Feed plate
1918S
1
BAS-341F, 342F
2. SPECIFICATIONS
Stitch formation Single needle lock stitch
Sewing machine Lock stitch, pattern tacking sewing machine (with large shuttle hook)
Maximum pattern size BAS-341F: 250X 150 mm, BAS-342F: 300 X 200 mm
Maximum stitch number 20,000 (one pattern)
Stitch length 0.1 - 12.7 mm
Maximum sewing speed 2,500 rpm (When stitch length is 3 mm or less)
Feed mechanism Intermittent feed, pulse motor drive
Shuttle hook Double hook (Standard hook is sold separately)
Needle DP X 5, DP X 17, MR
Data storage method 3.5 floppy disk 2HD/1.44MB, 2DD
T e st function Operation test function provided for use with low speed drive
2. SPECIFICATIONS
Safety devi ce s
Work clamp height Max.30 mm
Work clamp Unit work clamp (special order-separate work clamp)
Work clamp lift stroke 18 mm
Intermittent stroke 0 or 3 (Factory default) - 8 mm
Weights
Power supply Single-phase 110V, 220V, 240V, 3-phase 220V, 380V, 400V, 900VA
Motor Three-phase 400 W induction motor
Air pressure 0.50 MPa 1.8 l/ min
Power table Use sitting or standing
Machine dimensions
Automatic stop function for activation in the event of misoperation realized with intermediate
stop function and safety circuits
Machine head: 80kg,
Control box: 10 - 20 kg (depending on destination)
BAS-341F 1,200W X 1,220D X 860H mm (Sitting)-1,130H mm (Standing)
BAS-342F 1,200W X 1,270D X 860H mm (Sitting)-1,130H mm (Standing)
BAS-341F, 342F
2
3. PREPARATION
3. PREPARATION
Machine installation s hould onl y be carried out by
a qualified technician.
Contact your Brother dealer or a qualified
electrician for any electrical work that may need to
be done.
The sewing machine head weighs more than 200
kg. The installat ion should be carried ou t by two or
more people.
Do not connect the power cord until ins tallation is
complete, otherwise the m achine may operate if
the foot switch is depressed by mistake, which
could result in injury .
Be sure to connect the ground. If the ground
connection is not secure, you run the risk of
receiving a serious electric shock.
Hold the machine he ad with both hands b y t wo or
more peple when tilting it back or returning it t o its
original position. Furth er more, after tilting back the
machine head, do not push the fac e plate side or
the pulley side from above, as this could cause the
machine head to topple over, which may result in
personal injury or damage to the machine.
CAUTION
Install the belt cover an d the frame side cover to
the machine head and motor.
If using a work table which has casters, the
casters should be secured in such a way so that
they cannot move.
Be sure to wear protective goggles and gloves
when handling the lubricating oil and grease, so
that they do not get into your eyes or onto your
skin, otherwise inflammation can result.
Furthermore, do not drink the oi l or ea t the greas e
under any circumstances, as they can cause
vomiting and diarrhoea.
keep the oil out of the reach of children.
3-1. Before setting up
1. Ins tall the Y driving shaft guard (1) to the rear of the
arm with the bolt (2) and the spring washer (3).
2. Install the g uard ( 4) to the table rear c over (5) with the
bolt (6), spring washer (7), flat washer (8) and nut (9).
1919S
3
BAS-341F, 342F
3-2. Positioning
3. PREPARATION
Decide the position for the sewin g machine. Loos en nuts
of four level adjusters (1) . Lower the level adjusters and
secure them with nuts (2).
Turning the level adjuster counterclockwise will raise its
height and turning it clockwise will lower it.
1920S
3-3. Tilting the sewing machine head
1921S
Gas spring
1. Remove screws (1) at the back of the work table, and
2. Remove bolt (3).
remove table cover (rear) (2).
The bolts are used to fix the machine in shipping.
Generally they are needless after removing them
keep them in another place.
3. Stand at the front of the table and slowly raise the
machine (4). Then lock it.
4. When returning the machine to its former position,
release lock (5). The gas spring will guide the machine
1922S
BAS-341F, 342F
to its original position.
4
3. PREPARATION
3-4. Connecting the ground wire
CAUTION
Be sure to connect the ground. If the gr ound connection is no t secure, you run the risk of receiving a serious
electric shock.
Connection method for 3-phase power supply.
Red
White
Black
Yellow/Greeen
3-5. V-belt tension
3-phase
power supply
Yellow/Green
Connect to
ground
0064Q
These should approximately 10 - 12 mm of slack when Vbelt is loaded at 9.8 N . To adjust, loosen the two nuts (1),
and shift the motor up or down.
1923S
3-6. Installing the foot switch
Insert the connector of the foot switch (2) into the
connector (3) of the control box (1).
1924S
5
BAS-341F, 342F
3-7. Installing the spool stand
(2)
(1)
Install the spool stand (1) to the table.
(1)
0073Q
3-8. Installing the programmer (option)
3. PREPARATION
[Vertical]
1181S
1. Install the programmer support (2) to the work table with the two screws (1).
2. Insert the programmer connector (4) securely into the left side of the operation panel (3).
[Flat]
(1)
(1)
(2)
(2)
(4)
1182S 1183S
(3)
BAS-341F, 342F
6
3. PREPARATION
3-9. Adjusting the air pressure
1. Air pressure should be 0.5 MPa.
The air pressure can be adjusted by pulling up an d
turning the control knob (2) on the integrator (1).
After adjustment is complete, push the control knob
(2) downward to lock it.
2. If water stands in the bottle of the integrator (1) , turn
the drain cock (3) in the direction indicated by an arrow
to drain the water.
Note
Open the air cock (4) slowly .
1925S
7
BAS-341F, 342F
4. LUBRICATION
CAUTION
Turn off the power switch before st arting lubricating, otherwis e the machine m ay operate if the foot switc h is
depressed by mistake, which could result in injury .
Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not
get into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oi l or eat the greas e under any circ umstances, as they can cause vom iting and
diarrhoea.
Keep the oil out of the reach of children.
Note
• Fill the machine with oil when the oil level is down to about one-third full in the oil sight glass.
If oil is not added and the oil drops belo w this level, there is the danger that the machine may sei ze during
operation.
• Be sure to let the machine operate for a while after adding the oil.
• Use only specified Brother oil (Nisseki Mitsubishi Sewing Lube 10N; VG10) for the machine oil.
4-1. Lubrication points
4. LUBRICATION
1. Fill the arm-side oil tank with oil.
(Fill the oil tank with sewing machine oil.)
3. Add a drop of oil to the shuttle hook race.
1926S
1928S
1927S
2. Fill the bed-side oil tank with oil.
1929S
4. If using the liquid cool ing tank (1), fill it with sil icon oil
(100 mm
2
/S).
BAS-341F, 342F
8
5. CORRECT USE
5. CORRECT USE
5-1. Selecting the needle and thread
Needle Thread Main application
DP X 5 #9 #100 - #60 Knitted wear
DP X 5 #16 #80 - #50 General clothing
DP X 17NY #19 #50 - #20 Denim
DP X 17 #21 #50 - #20 Denim
DP X 17 #25 #50 - #20 Leather•seat belts
5-2. Installing the needle and running the sewing machine
Turn off the power switch before installin g the nee dle, otherwis e the m achine m a y operate of the f oot s witch is
depressed by mistake and serious injury could result.
Different needles and threads are used for different sewing
applications.
Refer to the table at left for details on which needle.
CAUTION
Installing the needle
■
Loosen the set screw (1), insert the needle (2) as far as
it will go so that the groove is facing toward you and
then tighten the set screw (1).
1930S
To turn the pulley by hand
■
Turning
Press
Simply press in on the pulley (1) to tur n it by hand. To
turn the pulley, press lever (2) down.
• After turning the pulley b y han d, be sure t o pr ess the
lever down to return the pulley to the normal
operating position.
Down
1931S
9
BAS-341F, 342F
5-3. Threading the upper thread
CAUTION
Turn off the power switch before threadi ng th e thr ea d, ot herwise the machine m ay operate of the foot switch is
depressed by mistake and serious injury could result.
5. CORRECT USE
[When using cotton thread and spun yarn]
1932S
[With synthetic thread] [Threading in the upper thread breakage detector]
Real the thread from above once or
twice as the above figure.
1933S
■ Thread the upper thread correctly as shown in the illustration above.
Note
• Turn the machine pulley and raise the thread take-up lever (1) before threading the upper thread.
(This will make threading easier and it will prevent the thread from coming out at the sewing start.)
• When threading the thread through the needle, allow a distance of approximately 40 mm between the needle hole
and the end of the thread. If the trailing length of the thread is too long, it may cause the thread to.
1934S
BAS-341F, 342F
10
5. CORRECT USE
5-4. Winding the lower thread
Do not touch or place anything against any of the moving parts while winding the lower thread, otherwise
personal injury or damage to the machine may result.
(1)
CAUTION
1. Place the bobbin all the way onto the shaft.
2. Thread the thread as shown in the illustrat ion at left,
wind the thread around the bobbin several times in the
direction of the arrow, and then press the bobbin
presser (1).
3. Turn on the power switch.
(The POWER indicator on the operation panel will
illuminate.)
1198S
1199S
0106Q
(2)
(1)
(4)
(2)
(1)
1935S
4. Check that the needle is not touching the presser foot,
and then while pressing the ST EP BACK switch (2),
depress the foot switch (3) to start the m achine. Ke ep
depressing the foot switch (3) until the lower thread
stops being wound onto the bobbin.
Release the STEP BACK switch (2) after the machine
starts operating.
If you release the foot s witch before winding is com pleted, depress it once m ore while pr essing a nd holding the STEP BACK switch (2).
5. The bobbin presser (1) will autom atically return to its
(5)
original position after a set amount of thread (80 - 90%
of the bobbin capacity) has been wound on.
6. Release the foot switch (3).
7. Remove the bobbin, hook the thread onto the knife (4),
and then pull the bobbin in the direction of the arrow to
cut the thread.
8. To wind more thread onto the bobbin, l oosen the set
0107Q
screw (5) and pull the bobbin presser (1) outward.
<< If the thread winds onto the bobbin unevenly >>
If the thread winds onto th e bobbin unevenly, loosen
the nut (1) and turn the bob bin winder thread tensi on
stud (2) to adjust.
A
Note
If the thread winds on as shown in A, turn the b obbin
winder thread tension stud (2) clockwise; if it winds on
as shown in B, turn the bobbin winder thread tension
stud (2) counterclockwise.
11
B
0108Q
BAS-341F, 342F
5-5. Replacing the bobbin case and threading the thread
CAUTION
If the power switch needs to be lef t on whe n car rying out replacing the bobbin, b e extr emely careful to observe
all safety precautions.
The machine may operate if the foot switch is depressed by mistake, which could result in injury.
(ex. Continuing sewing from a stopping point)
(2)
(3)
(4)
5. CORRECT USE
30 mm
1936S
1. Pull the shuttle race cover (1) forward and then open the cover.
2. Lift the bobbin case latch and remove the bobbin case.
3. Insert a new bobbin into the bobbin case, and then pass the thread through the slot (2) and pull it out from the thread
hole (3). Check that the bobbin turns in the direction of the arrow when the thread is pulled at this time.
4. Pass the thread through the lever thread hole (4), and then pull out approximately 30 mm of thread.
0110Q
1202S
5-6. Sewing conditions and thread tension
5-6-1. Sewing conditions
Specifications For heavy materials
Upper thread # 20 or equivalent # 50 or equivalent
Lower thread # 20 or equivalent # 60 or equivalent
Upper thread tension (N) 1.5 - 2.0 0.5 - 1.0
Lower thread tension (N) 0.2 - 0.4 0.2 - 0.4
Thread take-up spring height 8 - 10 mm 6 - 8 mm
Thread take-up spring tension(N) 1.5 - 2.0 0.4 - 0.6
For medium materials
Needle DP X 17 # 21 DP X 5 # 16
Normal sewing speed 2000 rpm 2000 rpm
The sewing conditions given in the above table may need to be changed depending on the article being sewn.
BAS-341F, 342F
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5. CORRECT USE
(5)
5-6-2. Lower thread tension 5-6-3. Upper thread tension
Weaker
Stronger
(1)
0112S
Set the lower thread tension to as weak a tension as
possible and so that the bobbin case drops by its own
weight when the end of the thread is held. Turn the
adjusting screw (1) to adjust the tension.
Weaker
Turn the tension nut (2) (main tension) to adjust the tension
as appropriate for the material being sewn.
Furthermore, turn the thread n ut (3) ( sub-tensio n) to adjust
the remaining length of upper thread to 35 - 40 mm.
Stronger
Weaker
Stronger
1937S
Note
If the lower thread tens ion is too weak, it m ay not be
possible to cut the lower thread properly during thread
trimming .
5-6-4. Thread take-up spring height 5-6-5. Thread take-up spring tension
Lower
Higher
1938S
Loosen screw (4) and turn the entire thread take-up unit to
adjust so that the height of the thread take-up spring is 8 10 mm
BAS-341F, 342F
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Stronger
Weaker
1939S
Adjust the thread take-up spring tension by turning the
tension stud
with a screwdriver.
5-6-6. Pretension tension
5. CORRECT USE
1940S
1. Raise the work clamp (1) and open the main tension disc (2).
The thread take-up spring (3) should not operate when the thread is pulled in the direction of the arrow.
2. Set the thread tension for the thread breakage detector pretension (4) to approx. 5 g.
Weaken the thread tension for the machine head pretension (5) as much as possible.
Standard for balance of thread tension
Adjust the thread tensions so that the total tension for the pretensions (4) and (5) is lower than the tension for the thread
take -up spring.
When the thread breakage detector is activated, set to ON DIP switch A – 8.
(Detection precision : DIP switch B – 5, Refer to “ DIP SWTCH “.)
Note
If misoperation of the thread breakage detector continues, repeat the adjustment procedure above.
(Such misoperation is most likely to occur when synthetic fiber yarns are used.)
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