Brother International LK3-B430 Service Manual - Page 33

T

THREAD

TENTION

AND

TENSION

RELEASE

1.

Thread

take-up

lever

stroke

adjustment

Operating

state

-

7

mm

Non

-operating

state

Thread

take-up

lever

stroke

can

be

adjusted

up

to

7

mm

maximum.

Adjust

it

as

appropriate

to

the

work

to

be

sewn.

(1)

With

the

machine

in

operation.

loosen

screw

O.

and

move

guide

shaft

0

to

the

right

or

left.

The

smaller

the

stroke.

the

better

will

be

the

stitches

on

the

wrong

side.

However.

the

stroke

must

not

be

so

small

as

to

cause

the

thread

to

slip

out.

*

In

adjusting

the

thread

take-up

lever

stroke.

adjust

it

so

that

the

center

of

guide

shaft

0

will

always

be

within

the

mark

range.

2.

Main

tension

disc

clearance

adjustment

With

the

machine

at

the

stop

position.

loosen

two

screws

0

and

move

tension

release

bar

0

to

the

right

or

left

so

that

the

main

tension

discs

have

a

clearance

of

0.5

to

1

mm.

3.

Sub

-tension

adjustment

0.5-1.

0ffn

.---

0

0.5

--1.0tra

rr

•

o<

O

(

I

)

Sub

-tension

disc

clearance

With

the

machine

at

the

stop

position.

loosen

screw

0

and

move

the

sub

-tension

assembly

so

that

the

sub

-

tension

discs

will

have

a

clearance

of

0.5

to

1.0

mm

(21

Sub

-tension

timing

Loosen

nut

G.

remove

screw

0.

loosen

nut

0.

and

turn

work

clamp

lifter

adjusting

joint

0

so

that

the

sub

-

tension

discs

will

tighten

immediately

before

the

movable

knife

cuts

the

thread.

*

The

sub

-tension

discs

tighten

sooner

as

the

work

clamp

lifter

adjusting

joint

is

turned

in.

—

33

—

Brother International LK3-B430 Service Manual - Page 33

THREAD, TENTION, TENSION, RELEASE, Operating, state, operating, 1.0tra

Page 33 highlights