Brother BAS-761 User Manual
BAS-761
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
AUTOMATIC POCKET SETTER <JEANS>
INSTRUCTION MANUAL
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 sewing machines, it is normal to carry out work while positioned directly in front of moving
parts such as the needle and thread take-up lever, and consequently there is always a danger of injury that
can be caused by there 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 the machine correctly.
SAFETY INSTRUCTIONS
z Safety indications and their meanings
This instruction manual and the indications and symbols that are used on the machine itself are provided in
order to ensure safe operation of this machine and to prevent accidents and injury to yourself or other
people. The meanings of these indications and symbols are given below.
Indications
DANGER
CAUTION
Symbols
.................This symbol ( ) indicates something that you should be careful of. The picture
.................This symbol (
.................This symbol (
The instructions which follow this term indicate situations where failure to
follow the instructions will almost certainly result in death or severe injury.
The instructions which follow this term indicate situations where failure to
follow the instructions could cause injury when using the machine or physical
damage to equipment and surroundings.
inside the triangle indicates the nature of the caution that must be taken.
(For example, the symbol at left means "beware of injury".)
) indicates something that you must not do.
) indicates something that you must do. The picture inside the
circle indicates the nature of the thing that must be done.
(For example, the symbol at left means "you must make the ground connection".)
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i
x Notes on safety
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from
the wall outlet before opening the face plate of the control 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 free from sources of strong electrical
noise such as high-frequency welders.
Sources of strong electrical noise may
cause 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 power supply capacity should be
greater than the requirements for the sewing machine’s electrical consumption.
Insufficient power supply capacity may
cause problems with correct operation.
The pneumatic delivery capability should be
greater than the requirements for the sewing machine’s total air consumption.
Insufficient pneumatic delivery capability
may cause problems with correct operation.
The ambient temperature should be within
the range of 5°C to 35°C during use.
Temperatures which are lower or higher
than this may cause problems with correct
operation.
The relative humidity should be within the
range of 45% to 85% during use, and no
dew formation should occur in any devices.
Excessively dry or humid environments and
dew formation may cause problems with
correct operation.
Avoid exposure to direct sunlight during use.
Exposure to direct sunlight may cause problems with correct operation.
In the event of an electrical storm, turn off
the power and disconnect the power cord
from the wall outlet.
Lightning may cause problems with correct
operation.
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BAS-761
CAUTION
Installation
Machine installation should only 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 weights more than 400
kg. The installation should be carried out
by two or more people.
Do not connect the power cord until installation is complete, otherwise the machine
may operate if the start switch is pressed
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.
This sewing machine should only be used
by operators who have received the
neccessary training in safe use beforehand.
The sewing machine should not be used
for any applications other than sewing.
Be sure to wear protective goggles when
using the machine.
If goggles are not worn, there is the danger
that if a needle breaks, parts of the broken
needle may enter your eyes and injury may
result.
Attach all safety devices before using the
sewing machine.
If the machine is used without these devices
attached, injury may result.
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 oil or eat the
grease under any circumstances, as they can
cause vomiting and diarrhoea.
Keep the oil out of the reach of children.
Avoid setting up the sewing machine near
sources of strong electrical noise such as
high-frequency welding equipment.
If this precaution is not taken, incorrect machine operation may re
Have two people present to hold the machine
head with both their hands when tilting it back
or returning it to its original position.
Sewing
Turn off the power switch at the following
times, otherwise the machine may operate if
the start switch is pressed by mistake, which
could result in injury.
• When replacing the needle
• When not using the machine and when leaving the machine unattended
Do not touch any of the moving parts or press
any objects against the machine while sewing, as this may result in personal injury or
damage to the machine.
If an error occurs in machine operation, or if
abnormal noises or smells are noticed, immediately turn off the power switch. Then
contact your nearese Brother dealer or a
qualified technician.
BAS-761
If the machine develops a problem, contact
your nearest Brother dealer or a qualified
technician.
iii
CAUTION
Cleaning
Turn off the power switch before starting any
cleaning work, otherwise the machine may
operate if the start switch is pressed by mistake, which could result in injury.
Maintenance and inspection
Maintenance and inspection of the sewing
machine should only be carried out by a
qualified technician.
Ask your Brother dealer or a qualified electrician to carry out any maintenance and
inspection of the electrical system.
Turn off the power switch and disconnect
the power cord from the wall outlet at the
following times, otherwise the machine may
operate if the start switch is pressed by mistake, which could result in injury.
• When carrying out inspection, adjustment
and maintenance
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 oil or eat the
grease under any circumstances, as they can
cause vomiting and diarrhoea.
Keep the oil out of the reach of children.
If the power switch and air need to be left on
when carrying out some adjustment, be extremely careful to observe all safety precautions.
Use only the proper replacement parts 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.
• When replacing consumable parts such
as the rotary hook and knife
Disconnect the air hoses from the air supply and wait for the needle on the pressure
gauge to drop to "0" before carrying out inspection, adjustment and repair of any parts
which use the pneumatic equipment.
Have two people present to hold the machine
head with both their hands when tilting it back
or returning it to its original position.
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BAS-761
c Warning labels
★ The following warning labels appear on the sewing machine.
Please follow the instructions on the labels at all times when using the machine. If the labels have
been removed or are difficult to read, please contact your nearest Brother dealer.
1
Moving parts
may cause injury.
Operate with safety de vices .
Turn off main switch before
changing needle, cleaning
etc.
Safety devices: Thread take-up cover,
Guard bar, Belt cover, etc.
2
Hazardous voltage
will cause injury.
Turn off main
switch and wait 5
minutes before
opening this cover.
3
Hochspannung
verletzungsgefahr!
Bitte schalten sie den
hauptschalter aus und
warten sie 5 minuten,
bevor sie diese
abdeckung ffnen.
Un voltage non adapt
provoque des blessures.
Eteindrel’interrupteur et
attendre 5 minutes
avantd’ ouvrir le capot
Direction of operation
Un voltaje inadecuado
puede provocar las
heridas.
Apagar el interruptor
principal y esperar 5
minutos antes de abrir
esta cubierta.
1
Thread take-up cover
1
Belt cover
Guard bar
3
2
Guard bar
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CONTENTS
1. Names of Machine Components .............................................................................................................. 1
2. Specifications ............................................................................................................................................. 2
3. Installation .................................................................................................................................................. 3
3-1. Installation of the machine table ..................................................................................................... 3
3-2. Removal of the fixing bolts from the machine .............................................................................. 4
3-3. Installation of the spool stand ......................................................................................................... 4
3-4. Connection of the foot-switch connector ....................................................................................... 5
3-5. Connection of the air hose ............................................................................................................... 5
3-6. Positioning of the front supporter ................................................................................................... 5
3-7. Installation positions for operation box and switch box ............................................................... 6
3-8. Installation of the folding group assembly .................................................................................... 7
4. Lubrication .................................................................................................................................................. 8
5. Correct operation ....................................................................................................................................... 9
5-1. Installing the needle ......................................................................................................................... 9
5-2. Upper threading ............................................................................................................................... 9
5-3. Bobbin case threading ..................................................................................................................... 10
5-4. Bobbin thread winding .................................................................................................................... 11
5-5. Thread tension .................................................................................................................................. 12
6. Button functions ........................................................................................................................................ 13
6-1. Operation box panel buttones ......................................................................................................... 13
6-2. Switch box panel buttones .............................................................................................................. 16
6-3. Foot switch ........................................................................................................................................ 17
6-4. RESTART buttones ........................................................................................................................... 17
7. Setting before sewing ............................................................................................................................... 18
7-1. Setting the folder mode ................................................................................................................... 18
7-2. Setting the sewing speed and the bar tacking speed .................................................................... 18
7-3. Setting the lower thread counter .................................................................................................... 20
7-4. Setting the piece counter ................................................................................................................. 21
7-5. Setting the stacker roller feed amount ........................................................................................... 21
7-6. Setting the date and time ................................................................................................................ 22
8. Preparation for sewing .............................................................................................................................. 23
9. Sewing ........................................................................................................................................................ 25
9-1. Sewing with the folder in automatic mode ....................................................................................25
9-2. Sewing with the folder in pattern matching mode ........................................................................ 26
9-3. Sewing with the folder in label attachment mode......................................................................... 27
9-4. Sewing with the folder in step mode .............................................................................................. 28
9-5. Test feeding ....................................................................................................................................... 29
9-6. Emergency stop ................................................................................................................................ 30
10. Adjustments ............................................................................................................................................... 31
10-1. Needle-bar height adjustment ......................................................................................................... 31
10-2. Needle and rotary hook timing ........................................................................................................ 32
10-3. Presser foot height adjustment........................................................................................................ 32
10-4. Removal of the fixed knife and the movable knife ......................................................................... 33
10-5. Stacker position adjustment ............................................................................................................ 34
10-6. Sewing clamp assembly number selection ....................................................................................35
11. Using the DIP switches.............................................................................................................................. 36
12. Table of error code ..................................................................................................................................... 38
BAS-761
1. Names of Machine Components
1. Names of Machine Components
i
!0
!1
o
u
@0
y
!9
@1
!2
!4
!3
!5
!7
!6
t
r
e
w
!8
q
q Foot-switch w Stacker e Guard bar
r Feed roller t Machine head y Spool stand
u Top cover i Control box o Switch box
!0 Folding group assembly !1 Mechanical valve !2 RESTART buttons
!3 Front supporter !4 Floppy drive !5 Programmer
!6 Air unit valve !7 Power switch !8 Blower Motor
!9 2-Step thread tension device @0 Thread breakage detector @1 Pocket support
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BAS-761
2. Specifications
2. Specifications
Applicable machine type
Use
Cycle time
Sewing speed
Bar tacking speed
Sewing range
Sewing pitch
Needle racking width
at first bar tacking
Cloth setting
Machine head drive
Machine body drive
Memory medium
Lock stitch and special cross stitch sewing machine with automatic thread trimmer
Sewing pockets on the various types of jeans
9 seconds approx. (depending on the pitch and rpm)
500 – 4250rpm (9-step button selectable; limited by sewing condition)
500 – 3500rpm (7-step button selectable; cannot exceed sewing speed)
250 (X) mm ⳯ 250 (Y) mm Standard (when not using retractable work clamp)
250 (X) mm ⳯ 200 (Y) mm For retractable work clamp
(restrictions may occur because of shape)
0.05 – 6.00mm
Maximum of 3.5 mm
Overlapping possible
AC servo direct motor type
X-axis for a clamp shift, Y-axis for a machine shift, AC servo motor (750W).
3.5-2HD inch floppy disk
64 patterns (Maximum of 1,000 stitches for each pattern)
Jig attaching/
detaching method
Stacker
Programmer
Power source
Air pressure
Machine dimensions
Weight
Upper-thread breakage
detector
Label attachment device
Air chuck; one-touch operation requiring less than 2 minutes
Included (Stacking capacity 60 pieces)
Included
3-phase 200V, 220V, 380V, 400V, 415V ( 900W)
0.44 – 0.54MPa
(W) 2.108mm, (L) 1.919mm, (H) 970mm
400kg
Included
Included (option)
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2
3. Installation
3. Installation
CAUTION
Machine installation should only 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 weights more than
400 kg. The installation should be carried out
by two or more people.
Co not connect the power cord until installa
tion is complete, otherwise the machine 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.
Do not place any objects on top of the top
cover, otherwise such objects may fall down
onto the machine.
If you need to put something on top of the top
cover, place it inside a box or similar to secure it so as to stop it from falling down.
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 oil or eat
the grease under any circumstances, as they
can cause vomiting and diarrhoea.
Keep the oil out of the reach of children.
Avoid setting up the sewing machine near
sources of strong electrical noise such as
high-frequency welding equipment.
If this precaution is not taken, incorrect machine operation may result.
Hold the machine head with both hands when
tilting it back or returning it to its original position. Furthermore, after tilting back the machine head, do not push the face 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.
Note:
¡ This sewing machine has a movable machine head and work clamp. Be careful not to place other objects within
the moving range of these parts.
¡ Supply power directly from a receptacle for the machine's exclusive use.
¡ Be sure to power off when installating.
3-1. Installation of the machine table
1. Secure the level adjusters q so that the table top re-
main level.
2. The table has eight level adjusters. If the table does not
sit well, loosen nuts w and turn the level adjusters q
to level the table.
Note:
There are eight adjusting points.
To move the machine, turn up adjusters q, and the table
w
q
can be moved on its machine body casters e.
e
3
BAS-761
3-2.Removal of the fixing bolts from the machine
The machine head and the sewing clamp arm are fixed with bolts to secure them during transportation.
q
Remove fixing bolt q on the machine head through the hole in the front cover.
Note:
¡ Save removed fixing bolts q future use.
¡ Before transporting the machine be sure to secure it with the fixing bolts.
3. Installation
3-3. Installation of the spool stand
Install the spool stand as shown in the illustration at left.
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4
3. Installation
3-4. Connection of the foot-switch connector
q
3-5. Connection of the air hose
1. Attach air hose q to air unit valve w.
2. Move the upper cap of air unit valve w upward and ad-
3. After adjustment, move the cap downward and lock.
w
Connect connector q securely.
just the air pressure to 0.49 MPa.
q
3-6. Positioning of the front supporter
1. Loosen bolts q and position front supporter w in the
most appropriate position.
2. Tighten bolts q to secure the supporter w.
w
q
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BAS-761
3-7. Installation positions for operation box and switch box
Loosen the mounting bolts e for the operation box q
w
q
e
and switch box w, and move them in the direction of the
arrow to a position where they are comfortable to operate.
3. Installation
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6
3. Installation
3-8. Installation of the folding group assembly
Before installation
¡ Apply air pressure.
¡ Turn on power switch q to return the machine to the home position.
¡ Turn valve switch w to OFF (lower) side and "E-820" will flash on the display.
t
w
r
!0
o
i
e
y
u
!4
!3
!2
!1
@1
q
1. Install folding clamp assembly e onto folding base r.
2. Attach multi-connector t.
3. While pushing the folding clamp assembly e downwards with your hand, install the inner clamp assembly y to
the folding base r. For models with a label attachment device u, install the plug i of the label attachment device
u to the socket o.
At this time, set the label attachment device u so that it is in a ready condition on top of the inner clamp assembly.
(Refer to page 27.) If it is reversed, it will turn downward.
4. Install center blade assembly !0 on folding base r.
5. Install sewing clamp assembly !1 on sewing clamp assembly arm base !2.
6. Install the multi-connector !4 and the dual sensor harness assembly !3.
7. Set the valve switch w to ON (up position).
The "E-820" indication will disappear from the display panel and the panel will return to its previous condition.
8. Move folding clamp assembly e, inner clamp assembly y, center blade assembly !0 and sewing clamp assembly
!1 back and forth, and right and left, to ensure they are secured.
7
BAS-761
4. Lubrication
4. Lubrication
Note:
Check for sufficient oil through oil gauge windows A and B on the machine head and the table.
If the oil amount is not sufficient, be sure to replenish it.
How to oil the machine head
Replenish the oil through oil port q.
How to oil the machine table
1 Move the machine head forward so that the lubrication hole e in the needle plate bracket RR w and the lubri-
cation port r in the machine bed are aligned.
2 Apply oil to the lubrication port r in the machine bed through the lubricationhole e in the needle plate bracket
RR w.
Note:
Before initial operation of the machine or after a long interval, be sure to drip a few drops of oil onto the arrowed
lubrication point C.
How to drain oil from the machine body
Remove poly-oiler t and drain the oil.
Rotary hook lubrication control
Turn the rotary hook lubrication adjustment valve y to adjust the lubrication amount.
C
t
q
w
A
e
r
B
y
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