Brother International EF4-B561 Service Manual - Page 13

The

top

end

of

upper

knife

driving

rod

@

is

connected

with

upper

knife

driving

lever

0

with

pin

@,

then

upper

knife

driving

lever

0

gets

oscillating

movement.

Upper

knife

0

is

connected

upper

knife

holder

ID,

gets

oscillating

movement

with

the

intermediate

action

of

upper

knife

driving

lever

0

and

upper

knife

driving

arm

(3.

2)

Lower

knife

mechanism

•

Lower

knife

0

is

fixed

with

lower

knife

holder

0

and

being

pushed

to

upper

knife

0

with

the

pressure

of

lower

knife

holder

spring

plays

a

role

of

edge

trimming

with

upper

knife

0.

And

lower

knife

holder

guide

plays

role

of

positioning

of

lower

knife

@

and

guide

of

lower

knife

holder

.

A

FEED

MECHANISM

ti

C5)

0

I

©

1)

Horizontal

feed

mechanism

In

case

that

crank

shaft

@

may

rotate

to

the

direction

indicated

with

arrow,

with

under

looper

eccentric

cam

@,

feed

rod

0

connected

with

under

looper

eccentric

cam

@,

gets

back

and

forth

movement.

•

The

top

end

of

feed

rod

0

is

connected

with

feed

arm

with

pin

thus

feed

arm

makes

oscillating

movement.

•

Feed

arm

@

is

fi

tted

with

feed

shaft

®

,

so

that

main

feed

arm

Q

and

differential

feed

arm

@

get

oscillating

movements

because

these

two

arms

are

fitted

with

feed

shaft

.

This

oscillating

movement

becomes

horizontal

movement

of

main

feed

bar

0

and

differential

feed

bar

4D

with

the

movements

of

main

feed

link

4)

and

differential

feed

link

@.

2)

Vertical

feed

mechanism

•

The

part

being

fitted

with

crank

shaft

@

is

eccentric,

so

that

part

Efik)

of

feed

lifting

slide

block

0

,

main

feed

bar

and

differential

feed

bar

(I)

get

vertical

movements.

3)

Stitch

length

regulator

and

differential

feed

mechanism

As

for

the

adjustment

stitch

length,

loosen

nut

41

and

adjust

the

scale

on

indicator

plate

in

accordance

with

the

scale

on

main

feed

arm

0

and

then

retighten

nut

®

.

The

differential

ratio

can

be

adjusted

by

changing

the

scale

on

differential

feed

arm

@

against

the

scale

on

main

feed

arm

0.

In

case

of

shrink

feed,

set

the

scale

on

differential

feed

arm

@

to

a

larger

number

than

that

of

the

scale

on

main,

feed

arm

O.

In

case

of

stretch

feed,

set

the

scale

on

differential

feed

arm

@

to

a

smaller

number

than

that

of

the

scale

on

main

feed

arm

Q.

—

11

—

Brother International EF4-B561 Service Manual - Page 13

Lower, knife, mechanism, MECHANISM, Horizontal, Vertical, Stitch, length, regulator, differential

Page 13 highlights