Brother BAS-320 Service Manual

Electronically Programmable lockstitch Machine

with

Cylinder Arm Profile Sll

Service manual

CONTENTS

1.

MECHANISM

4.

STANDARD

ADJUSTMENTS

Needle bar, thread take-up, lower shaft,

D

m

11

m

m m

fJ

m m

2. DISASSEMBLY PROCEDURES

shu~tle

and Work clamp mechanism (1) Work clamp mechanism (2) Work clamp mechanism (3)

Feed

mecha.nism

Feed

mechanism Intermittent-presser Intermittent-presser

Thread trimming mechanism Thread Thread wiper mechanism Thread winding mechanism

Lubrication

hook mechanism

(X (Y

release

mechanism

.......................

axis)

..............

axis)

..............

foot

mechanism (1)

foot

mechanism (2)

..............

..........

............

....

............

.............

............

D Covers . . . . . . . . . . . . . . . . . . . . . . . . . . 8

PJ-1

Work clamps (solenoid type) . . . . . . . . . . . 10

PJ-2

Work clamps (pneumatic type) . . . . . . . . .

11

Lower shaft . . . . . . . . . . . . . . . . . . . . . . .

EJ

Longitudinal feed

D)

Traverse

GJ

Thread wiper . . . . . . . . . . . . . . . . . . . . . . 15

fJ

I nterm

[;]

Needle bar

D)

Work clamp

ml

Thread trimming . . . . . . . . . . . . . . . . . . . 19

feed

itti

nt-presser

m Intermittent-presser

1m

Upper shaft . . . . . . . . . . . . . . . . . . . . . . .

3. ASSEMBLY PROCEDURES

(Y

axis) . . . . . . . . . . . . . 13

(X axis) . . . . . . . . . . . . . . . . 14

foot

. . . . . . . . . . . . . . 16

........................

lifter

and

thread

release

. . . . . . . 18

foot

lifter.

. . . . . . . . . . 20

AND

ADJUSTMENT

11 12

17

21

D Upper shaft . . . . . . . . . . . . . . . . . . . . . . . 22

PJ

Intermittent-presser

11

Needle bar . . . . . . . . . . . . . . . . . . . . . . . . 24

E)

Intermittent-presser

1!1

Work clamp

G)

Thread

fJ

Traverse feed (X axis) . . . . . . . . . . . . . . . .

[;]

Longitudinal feed (Y axis) . . . . . . . . . . . . . 32

DJ

Lower shaft

1m

Work clamp arm

lifter

trimming

and

m Thread wiper

1m

Intermittent-presser

foot

lifter.

. . . . . . . . . . 23

foot

. . . . . . . . . . . . . . 25

and

thread

release

. . . . . . .

. . . . . . . . . . . . . . . . . . . 29

relevant . . . . . . . . . . . . . . 33

and

relevant . . . . . . . . . . . 34

......................

foot

. . . . . . . . . . . . . . 38

27

30

36

Ill Covers and relevant . . . . . . . . . . . . . . . . . . 39

D Adjustment

of

needle-bar height . . . . . . . . . 42

D

6 Matching the needle

with

the

tip

of

1

11

2 2 3

3

4 4

5 5

6 6

7

Adjustment

needle and the

EJ

Adjustment

the driver . . . . . . . . . . . . . . . . . . . . . . 43

DJ

Adjustment

thread guide

G)

Adjustment

fJ

Adjustment

[;]

Adjustment

D) Adjustment

foot

lift

ml

Adjustment

m Adjustment

and

feed timing . . . . . . . . . . . . . . . . . . 49

16

Adjustment

Ill Adjustment

release

timing . . . . . . . . . . . . . . . . . . . .

Ill Adjustment

mJ

Adjustment

1m

Adjustment

position . . . . . . . . . . . . . . . . . . . . . . . 53

5.

HOW TO

D How

fJ

How

to

make up the clamping type

to

make up the

the shuttle hook . . . . . . . . 42

of

clearance between the

tip

of

the shuttle hook . . . 43

of

the needle receiver

of

the shuttle hook

.....................

of

the

work

clamp

of

the moving blade . . . . . . . . . 45

of

the

presser

of

the intermittent-presser

.......................

of

the thread

of

the needle-stop position

of

the original

of

the upper thread

of

the backlash . . . . . . . . . . . . 52

of

the thread trimming

of

the

work

MAKE

foot

wiper.

clamp

UP

cassette

of

lift

. . . . . . . . 45

. . . . . . . . . . 47

. . . . . . . . . 48

point

. . . . . . . . . 50

cam

lifter

base

THE PRESSER

presser

type

presser

. . . . 53

. . . 56

44

47

51

. . 54

fl

II

I I I

II

6.

ADJUSTMENT

APPLIANCES

Description on fuse

D

Voltage measurement

PJ

LEOs

on

PCB

11

How

m

m m

to Description Description

7.

TROUBLESHOOTING LIST

......................

use

the DIP switch . . . . . . . . . . . . .

of

each

on

OF ELECTRIC

........•.........

................

connector

control box

..........•

.............

.....

58 59

60 61 63

65

66

I

I I

8. SPARE PARTS LIST

9.

CONTROL

DIAGRAM

10. TROUBLESHOOTING FLOW

11. COUNTERMEASURES

CIRCUIT

..................

CHART

...........

BLOCK

..............

..........

69

70

71

78

MECHANISM

D Needle bar, thread take-up, lower shaft,

a

W

(j) Needle

bar

and

shuttle hook mechanism

!

Up

and

down

lo

wer

sha

ft

gear

Swing

O Swing gear

motion

Direction

of

Pulley

rotation

fl

Work

•

clamp mechanism ( 1 )

®Sol

enoid

lever shaft

@

Work

clamp

cam lever

Needle Lower

bar/Thread

shaft/shuttle

take-up

hook

machanism

mechanism

@ Sol

enoid

CD

Main

(acting

1 2 3 4 5 6 7 ®

(j)-->®--->

lever

work

clamp solenoid

on

the final needle

~-0-0-0

when

turned

ON)

--+8--+

(l)

I ®

t

Up

and

down motion

Work

clamp

lifter

plate

Work

clamp mechanism (2)

Work

clamp mechanism (3)

~--@

Work clamp arm lever plate

@Work

foot

clamp

@Work

• While

the

sewing machine

to

comes work clamp lifter pedal solenoid

a rest in "Work clamp mechanism (2)

@works,

2

clamp

lifter

solenoid-ON

is

kept

stopped,

is

pressed,

raising the work clamp @ .

the

work clamp lifter

the

mechanism

."

When

the

RJ

Feed mechanism

@ T imi

ng

pulley

__

_

(X

®

__.,

axis)

Idle

gear--

--,

MECHANISM

T

belt

shaft

X retai

ner

•

Support

the

ed and guid

feed

base

X fixed

Feed mechanism

ed

®

Timing

by

the X reta

on

the

timing belt traverses.

(Y

axis)

belt

--

iner

----'

(j)

and

X feed guid

Feed base X

e,

CD

Pulse

motor

Y assembly·ON

@v

rack

~

F

orwa

backward

rd and

motion

® Feed

pla

te

3

El

Intermittent-presser foot mechanism {1)

®Intermittent

arm L

(j) Link L

@ Feed-lever roller

feed

-----@Intermittent

Direction of rotation

::)~

~-"'----@Intermittent

lever

feed arm R

~CD

Upper shaft

®Presser

foot lifter cam

Intermittent-presser foot mechanism {2)

•

Mechanism

for raising the presser foot.

@ Intermittent

presser lever

\.

4

Gt

Thread trimming mechanism

MECHANISM

n

"

Stopper -

Gl

Thread release mechanism

~

Moving blade connecting

@ Thread

•

The thread

lever ®

stopper and

is

trimming

~@

0

trimming released

connecting lever

falls

cam

from

down.

rod

the

@Thread

.tJIIII"""

Forward and backward

trimming

rod

assembly B Swing

® Thred

lever \

motion

trimming

Swing

motion

~

Up

® Thread

and

down

@Thread

(f) Thread

trimming

motion

trimming

rod assembly A

shaft

lever

5

CD

Main

work

clamp solenoid-ON

(j)

Work

Upper-thread release

@

lever

clamp I

ifter

lever

6 Thread wiper mechanism

® Solenoid

CD

@ Thread wiper crank

CJ

Thread winding mechanism

lever----..

Wiper solenoid-ON

assembly

@Wiper

CD

Bobbin holder

® Thread-winding cam

shaft

@ Leaf spring

6

(!] Lubrication

MECHANISM

7

DISASSEMBLY PROCEDURES

D Covers(1)

® Upper cover

0 Disassemble

the

illustrated parts in

the

order of

the

encircled figures.

(jJ)

Side cover LU

® Side cover LD

@ Large shuttle

---...

(4.

76X

~~

14)

hook

cover

@Bellow

holder

Cl)Bellow

-----'

8

:Cave~(~)

:-·

- -- -

...

-

(3.57X6)

@ Belt cover U

~~'--

(4.76X6)

~~----

@Original

point

cover

@ Remove this belt.

®

Return

the

the original pos1t1on.

hea~

!o

9

11-1

Work

clamp

(solenoid

type)

Work clamp

lifter

plate

CD

Turn hand work plate.

the

pully

to

lower

clamp

by

the

lifter

@Stop

(M5X

ring

16)

~®

(Az,®

~@

Work

clamp arm

®Stop

'---__,.....-®

lifter

ring

Work clamp

solenoid

@

Lift

the

auxiliary

plate and remove

it.

10

6-2 Workclamp(pneumatictype)

®Stud

screw--""'"'

DISASSEMBL V PROCEDURES

(f) Cylinder

support------J

®Air

tube

CD

Air

,.-----@

Pull

tube

~·

tube

Stud screw

out

the air

while pushing

11

Lower

shaft

Extract

the

(j) Driver

shaft.

®Lower

®Loosen

shaft

12

the

set collar.

DISASSEMBLY PROCEDURES

,---@

Y feed guide L

®Pulse

motor

Yassembly

13

'---

(J)

Y rack assembly

Iii

Traverse

feed (X

®X

retainer----

axis)

(1)

.......

® X feed guide

(DBelt

holder U

CD

Belt holder D

----..

----

------"

(3X8)

'*Steps@

~

d'

d"

through

(5X22)

I

(l)

Pully

base

@ Bearing cover

@)

indicate the removal procedure of the timing belt.

14

DISASSEMBL V PROCEDURES

@Stop

ring

(4.

76 X 14)

~

___

,,,

(6X20)l)

..

'

1.......---@Pulse

motor

(5X22)

base

@Remove

link.

the

wiper

@Wiper

~--(])Wiper

solenoid~

15

@Solenoid

(3.57X10)

lever

6

lntennittent-presser

foot

@Loosen the

set screw.

(5.95)

CD

Presser foot

@Intermittent

~~

L@Roller

fii\

'--

Intermittent support f )

1.!!.1

(Intermittent sup

lever

®stopring

• port sha t

® Loosen the screw

(4.76X16)

@Intermittent

stopper L

@ Intermittent

feed arm R

"(4.37 X 12)

\___@Loosen

the screw.

16

DISASSEMBLy

@Loosen the

(4.37

X8)

screw.

PROCEDURES

@Loosen

the screws.

@Loosen

(5.

) e screw.

95

th

~

®Needle

bar clamp

17

(g

Work

clamp

lifter

and

thread

release

(DWork

@Work

base

clamp

assembly

clamp

lifter

lever

® Upper thread-release lever

®Remove

spring.

18

the

1Dl

Thread·

trimming

(DLay

the sewing machine

DISASSEMBL V PROCEDURES

down.

®Needle

®

Turn

down.

plate assembly

the sewing machine

@Nut__}

(5.95)

r-----@

'f/

Lubrication support assembly

1

\__®Stud

screw

@Thread

@ Return the sewing machine

19

trimming

to

its original position.

shaft

"'

base

'-

"-

"

m

lntennittent-presser

foot lifter

~---

®Presser

foot solenoid

-~~

~.:.:~~

(4.

76 X 12)

,..---@Intermittent

®Intermittent

foot shaft

pre~

@Loosen the

screw.

(4.37)

"------(])Intermittent

20

-{1~·---

@Stop

presser foot lever

presser foot leverspring

ring

DISASSEMBLY PROCEDURES

@Loosen the

(6.35)

screw.----'

(6X16)

'----@Pully

'------@Bearing

.-----(j)

-----

Presser foot I ifter

------(j)

case

cam

(j) Feed connecting rod

Cam

washer

21

ASSEMBLY

AND

D

Upper

ADJUSTMENT

shaft

PROCEDURES

( 1)

Pass

the upper shaft

lifter

cam

@,

washer@

(2} Attach the bearing

in

that

CD

feed connecting rod

order.

case@

through the

to

the frame.

presser

@,

and

foot

cam

Push

the

(3)

screw

lightly,

(4)

Allow lightly,

(5) Align the matching mark on the crank rod upper

cover

presser

recess

and

then tighten.

the pulley and

attach

@with

@. Attach the crank rod @

upper cover

foot

lifter

cam

(g)

against the

so

that

the

cam

washer @ sti

®to

to

the matching mark on the crank rod

@ .

touch the

the upper shaft

to

CD.

the crank rod

set

II

collar

turns

(J)

22

@

(6)

(1)

Fit

the

hole

crank

Insert rod arm.

screw hole

of

the

to

the

upper shaft.

the

intermittent presser lever

®,and

presser foot lifter

of

upper shaft

the

balance crank @ with

CD.

Attach

RS

the

CD,

connecting

lever@

balance

into

the

(j)l--

Insert

........

'------®

'-----CD

@

(2) Fit

shaft

presser

(3)

Insert into stop lightly shaft toward

(4) Set

the

presser

of

the presser

foot

the

intermittent presser lever

ring®.

pressing

the

spring@,

foot

lifter

foot

solenoid @

intermittent presser foot lifter

Tighten

the

intermittent presser foot lifter

the

arm.

and

RS

lever @

solenoid

to

the

frame.

the

stop screw (j) while

the

right-side stop

@.

CD

onto

Attach

shaft®

and fit

ring@.

the the

the

23

Bl

Needle

bar

(5)

Lift pushing

solenoid@

®.

(1)

Assemble up support support shaft

recess with

the

presser

it

forward. Turn

clockwise, and then tighten

the

foot

lifter

thread take-up

shaft®.

lightly, and attach it

screw.

Push

RS

lever@

the

rotary plate

CD

and thread take-

the

thread take-up

onto

the

while

of

the

bolt

screw

Insert

(2)

take-up

Remove

of

part with

the

crank.

(3) Turn

(4)

the

through

Insert

® with

(5)

Insert

connecting rod

the

needle bar

CD

and balance crank

the

screw@

the

needle bar

screw recess. Tighten

pulley so

the

side hole. Then, tighten

the

slide block (j) into

the

hole

the

needle bar

®and

and make sure

crank@

that

of

the

clamp®

slide block (j).

crank@

the

screw ® can be fixed

slide block facing upward.

into

the

assembly@.

that

comes into

the

needle bar

the

screw ®.

the

needle bar guide

into

the

needfe bar

thread

the

shaft

contact

24