Brother International DB2-B737 Network Users Manual - English - Page 7

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1

3

RINCIPLE

OF

CONTROL

SYSTEM

0

00

0

OO

1.

When

the

power

switch

is

turned

on

and

the

treadle

0

is

stepped

on,

the

start

signal

and

the

voltage

correspond-

ing

to

the

stepping

degree

are

supplied

to

the

control

box

Q

by

the

treadle

unit.

The

voltage

is

supplied

to

the

motor

Q

by

the

control

circuit

board

in

the

control

box

0

so

that

the

motor

runs

in

proportion

to

the

stepping

degree

to

drive

the

sewing

machine.

2.

When

the

treadle

Q

is

returned

to

the

neutral

position

(with

foot

off),

the

neutral

signal

is

sent

to

the

control

box

by

the

treadle

unit

Q

and

the

brake

command

is

given

by

the

control

circuit

board

to

decelerate

the

motor

O.

Then

the

signal

from

the

synchronizer

0,

mounted

on

the

pulley

of

the

sewing

machine,

is

sent

to

the

control

box

Q

and

the

brakes

are

applied

so

that

the

operation

of

the

sewing

machine

is

stopped

at

the

needle

down

stop

position

set

by

the

synchronizer

0.

3.

When

the

treadle

is

stepped

on

again,

the

thread

trimming

signal

is

sent

to

the

control

box

by

the

treadle

unit

0

and

the

command

is

given

by

the

control

circuit

board

to

run

the

motor

Q

at

the

thread

trimming

speed

(inching

speed).

Then

the

signal

from

the

synchronizer

is

sent

to

the

control

box

0

and

the

brakes

0

are

applied

so

that

the

operation

of

the

sewing

machine

is

stopped

at

the

needle

up

stop

position

set

by

the

synchronizer

0.

Brother International DB2-B737 Network Users Manual - English - Page 7

Rinciple, Control, System

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