Brother DA-927A, DA-928A Instruction Manual
INSTRUCTION
DA-927A
MANUAL
DA-928A
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
TWIN NEEDLE / THREE NEEDLE FEED OFF THE ARM DOUBLE
CHAIN STITCHER
Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please
read the safety instructions 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, and consequently there is always a danger of injury that can be caused by
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 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
CAUTION
Symbols
· · · · ·
· · · · ·
· · · · ·
The instructions which follow this term indicate situations where failure to follow the
instructions may result in minor or moderate injury.
This symbol (△) indicates something that you should be careful of. The picture inside the triangle
indicates the nature of the caution that must be taken.
(For example, the symbol at left means “beware of injury”.)
This symbol ( ) indicates something that you must not do.
This symbol (●) 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”.)
i
DA-927A, DA-928A
[2] Notes on safety
CAUTION
Environmental requirements
Use the sewing machine in an area which is free
from sources of strong electrical noise such as
electrical line noise or static electric noise.
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 power
consumption.
Insufficient power supply capacity may cause
problems with correct operation.
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 weighs approximately 49 kg
(108lb). The installation should be carried out by
two or more people.
Do not connect the power cord until installation is
complete. The machine may operate if the treadle
is depressed by mistake, which could result in
injury.
Be sure to connect the ground. If the ground
connection is not secure, you run a high risk of
receiving a serious electric shock, and problems
with correct operation may also occur.
The ambient temperature should be within the
range of 5C to 35C 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.
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.
Installation
All cords should be secured at least 25 mm away
from any moving parts. Furthermore, do not
excessively bend the cords or secure them too
firmly with staples.
If this is not observed, fire or electric shocks may
result.
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, so that it does not get
into your eyes or onto your skin. If care is not taken,
inflammation can result.
Furthermore, do not drink the lubricating oil.
Diarrhea or vomiting may result.
Keep the oil out of the reach of children.
DA-927A, DA-928A
ii
CAUTION
Sewing
This sewing machine should only be used by
operators who have received the necessary 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.
Turn off the power switch at the following times.
However, the motor will keep turning even after the
power is switched off as a result of the motor’s
inertia. Wait until the motor stops fully before starting
work.
The machine may operate if the treadle is depressed
by mistake, which could result in injury.
When threading the needle
When replacing the needle
When not using the machine and when leaving the
machine unattended
If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.
Attach all safety devices before using the sewing
machine. If the machine is used without these
devices attached, injury may result.
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 nearest
Brother dealer or a qualified technician.
If the machine develops a problem, contact your
nearest Brother dealer or a qualified technician.
Cleaning
Turn off the power switch before carrying out
cleaning.
However, the motor will keep turning even after the
power is switched off as a result of the motor’s
inertia. Wait until the motor stops fully before starting
work.
The machine may operate if the treadle is depressed
by mistake, which could result in injury.
Be sure to wear protective goggles and gloves when
handling the lubricating oil, so that it does not get
into your eyes or onto your skin. If care is not taken,
inflammation can result.
Furthermore, do not drink the lubricating oil.
Diarrhea or vomiting may result.
Keep the oil out of the reach of children.
Use only the proper replacement parts as specified
by Brother.
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.
However, the motor will keep turning even after the
power is switched off as a result of the motor’s
inertia. Wait until the motor stops fully before starting
work.
The machine may operate if the treadle is depressed
by mistake, which could result in injury.
When carrying out inspection, adjustment and
maintenance
When replacing consumable parts such as the
looper.
If the power switch needs 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.
Brother will not be held responsible for any accidents
or problems resulting from the use of non-genuine
parts.
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
To prevent accidents and problems, do not modify
the machine yourself.
Brother will not be held responsible for any accidents
or problems resulting from modifications made to the
machine.
Modification
DA-927A, DA-928A
[3] 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
2
3
4
Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a
serious electric shock, and problems with correct operation may also occur.
Direction of operation
5
* Safety devices:
(A) Finger guard
(B) Thread take-up cover
(C) Pulley cover, etc.
Be careful to avoid injury from
the moving thread take-up.
DA-927A, DA-928A
iv
Oil tank
4378B
v
DA-927A, DA-928A
CONTENTS
1. NAMES OF MAJOR PARTS ...... 1
2. MACHINE SPECIFICATIONS .....
3. TABLE AND MOTOR .................
3-1. Table processing diagram ............................... 3
3-2. Motor ............................................................... 4
4. INSTALLATION .......................... 5
4-1. Installing the machine head ............................ 5
4-2. Ground wire connections ................................ 7
4-3. Installing the pulley cover ................................ 7
4-4. BeIt tension adjustment .................................. 8
4-5. Assembling the cotton stand ........................... 8
4-6. Lubrication....................................................... 9
4-7. Checking the machine pulley
rotating direction ........................................... 10
5. PREPARATION BEFORE
SEWING ...................................
5-1. Needles and threads ..................................... 11
5-2. Installing the needles .................................... 11
5-3. Threading the lower threads ......................... 12
5-4. Threading the upper threads ......................... 12
11
9. STANDARD ADJUSTMENTS .... 17
2
3
9-1. Needle bar height adjustment ....................... 17
9-2. Adjusting the looper rocking movement and
forward-back movement ................................ 18
9-3. Needle and looper timing adjustment ............ 19
9-4. The clearance between the needles and
loopers ........................................................... 20
9-5. Needle guard adjustment .............................. 21
9-6. Feed dog height adjustment .......................... 22
9-7. Upper thread take-up guide adjustment ........ 22
9-8. Adjusting the upper thread guide .................. 23
9-9. Tension release shaft adjustment ................. 23
9-10. Lower thread take-up timing adjustment ..... 23
9-11. Lower thread take-up thread guide
adjustment .................................................. 24
9-12. Installing the lapper ..................................... 24
10. TROUBLESHOOTING .............. 25
6. SEWING ................................... 13
6-1. Sewing .......................................................... 13
7. THREAD TENSION .................... 14
7-1. Adjusting the thread tension ......................... 14
7-2. Presser foot pressure adjustment ................. 14
7-3. Adjusting the stitch length ............................. 15
8. CLEANING ................................. 16
8-1. Daily cleaning ................................................ 16
8-2. Changing the lubricating oil
(every three months) ..................................... 16
DA-927A, DA-928A
1. NAMES OF MAJOR PARTS
1. NAMES OF MAJOR PARTS
(1) Machine pulley (4) Needle bar
(2) Front cover (5) Lapper
(3) Presser foot
Safety devices
(6) Thread take-up cover
(7) Finger guard
(8) Pulley cover
4243B
1
DA-927A, DA-928A
2. MACHINE SPECIFICATIONS
4244B
4245B
2. MACHINE SPECIFICATIONS
Specifications Specifications
Model
Specifications -1 -2 -3 -5 -7
Use
Max. sewing speed (sti/min) 4,000
Max. stitch length (mm) 3.8 4.7
Needle gauge
Needle (type) Organ TV x 64NY SCHMETZ TV x 5
Needle (count) #12 #14 #16 #130 #140
Outer perimeter of needle
drop cylinder (mm)
2 needles
3 needles 1/8 x 2 1/8 x 2
Light-weight
materials
3/16 3/16 3/16
1/4 1/4
DA-927A DA-928A
Light-weight to
medium-weight
materials
Medium-weight
materials
165
Heavy materials
Extra heavy
materials
* When the thread breaks due to heat at a speed of 4,000 sti/min sewing, reduce the sewing speed.
DA-927A, DA-928A
2
3. TABLE AND MOTOR
3. TABLE AND MOTOR
3-1. Table processing diagram
・The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and withstand the vibration of
the sewing machine.
・
Drill holes as indicated in the illustration below.
A: Chain hole
B: Motor mounting holes (3 places)
C: Cotton stand hole
D: Ground hole
E: Sewing machine mounting holes (2 places)
4389B
3
DA-927A, DA-928A
3-2. Motor
CAUTION
All cords should be secured at least 25 mm away from any moving parts. Furthermore, do not excessively bend the cords
or secure them too firmly with staples.
If this is not observed, fire or electric shocks may result.
Install the correct belt cover which corresponds to the motor being used.
<Motor>
・ Use a 400-watt 2-pole clutch motor.
Refer to the instruction manual for the motor for details on installing and using the motor.
・
<Motor pulley and V-belt>
For details on the relationship between the motor pulleys and belts, refer to the table below.
* The belt should be an M-type V-belt.
Pulley O.D. 65 70 75 80 85 90 95 100
M41
Belt size
M42
3. TABLE AND MOTOR
M43
Sewing speed
(sti/min)
50Hz 3100 3500 4000
60Hz 3100 3500 4000
DA-927A, DA-928A
4
Loading...