Brother International DB2-B737 Network Users Manual - English - Page 9

ADJUSTMENT

D

1

DC

Servomotor

Rotating

direction

10

mm

0

o

•

•

C)

0

ooS

0

2

*Set

down

the

machine

head

and

then

hang

the

belt

on

the

motor

pulley

and

the

machine

pulley.

*The

belt

comes

to

fit

the

machine

pulley

and

the

motor

pulley,

which

happens

to

loosen

the

belt

tension

sometimes.

Check

the

belt

tension.

*The

machine

rotates

counterclockwise

as

seen

from

the

pulley

side.

*Adjust

the

belt

0

by

loosening

the

set

screw

0

and

turning

the

nut

0

so

that

it

loosens

about

10

mm

when

pressed

by

finger.

Needle

position

detector

(synchronizer)

Model

DB2-B747

•

B791

•

B793

•

B795

•

B798

*Take

off the

synchronizer

cover

for

adjustment.

Synchronizer

detects

the

needle

by

two

hole

IC

and

controls

the

needle

down

signal

and

the

thread

trimming

signal

by

one

hole

IC.

0

0

0

0

Needle

down

stop

position

18

22

mm

N

t

.

5

mm

Needle

up

stop

position

4-eFor

medium

materials

9-11

mm

For

thick

materials

10-12

mm

Model

8798

22'-26

mm

7.5

mm

11

"-1.4

mm

*In

adjusting each

hole

IC,

do

not

fail

to

turn

off the

power

switch.

Position

Adjustment

for

Needle

Down

Signal

*Turn

the

machine

pulley

this

side

and

set

the

needle

5

mm

up

from

the

bottom

to

coincide

the

lower

end

of

the

magnet

0

with

the

upper

end

of

the

thread

trimming

needle

down

hole

IC

0

.

(As

for

the

model

B747

•

B748,

adjust

the

needle

7

mm

up

from

the

bottom

and

as

for

the

model

B798,

7.5

mm

up.)

When

the

lower

end

of

the

magnet

does

not

coincide

with

the

upper

end

of

the

thread

trimming

needle

down

hole

IC

0

,

loosen

the

screw

0

and

move

the

thread trimming

needle

down

hole

IC

for

adjustment.

When

the

thread trimming

needle

down

hole

IC

0

is

moved

in

the

rotating

direction,

the

needle

bar

comes

up.

And

when

in

the

reverse

direction,

the

needle

bar

comes

down.

Turn

on

the

power

switch

and

stop

the

machine

at

the

needle

down

stop

position

so

that

the

distance

between,

the

top

of

the

needle

plate

and

the

lower

end

of

the

needle

clamp

screw

is

18-22

mm.

(As

for

the

model

B798,

the

distance

is

22-26

mm.)

Position

Adjustment

for

Needle

Up

Signal

*Stop

the

machine

at

the

needle

up

stop

position.

The

needle

point

stops

9-11

mm

away

from

the

top

of

the

needle

plate

for

thin

and

medium

materials,

and

10-12

mm

for

thick

materials.

(As

for

the

model

B798,

the

needle

point

stops

11-14

mm

away.)

When

the

needle

point

does

not

stop

properly,

loosen

the

screw

0

and

move

the

needle

up

stop

hole

IC

0

for

adjustment.

When

the

needle

up

stop

hole

IC

0

is

moved

in

the

rotating

direction,

the

needle

bar

comes

down.

And

when

in

the

reverse

direction,

the

needle

bar

comes

up.

*Tighten

the

screws

0

and

0

by

the

force

of

6-10

kg

-cm.

Brother International DB2-B737 Network Users Manual - English - Page 9

thread trimming

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