Seiko CH Series Instruction Manual

Operating

Instructions

For

CH

CH-2B

CH-2B/DF

CH-6B CH-7B CH-8B

Series

CH-2-RF

<f

h

SEIKO

SEWING

TOKYO•JAPAN

MACHINE

CO.,

LTD.

Specifications

of

CH

Types

Sewing

Needle

Number

Sewing

Hook:

Bobbin:

Thread:

Feed

Stitch

Presser

Thread Thread

Needle

Bed

Working

Net

JIS

Motor:

Motor

V

speed;

type:

of

type:

system:

length:

foot:

lift:

take-up: take-up

bar

shape:

size:

space:

weight

classifications:

pulley:

Belt:

Applications:

needle:

stroke:

(head

stroke:

only)

Max. 800

the

models

DD X 1

(Needle

to

the

Single

Lockstitch

Oscillating CH

Type

s.p.m.

and

applications.)

#24-25,

type

standard

may

threadstobe

needle

large

(240 x 30.3

Cottonorsynthetic

(SB) Needle,

(7B)

(6B)

(2B)

Needle,

Lower

Upper&lower

(2B/DF)

upper&lower

Lower

feed,

Upper&lower

(Capableofintermediate

Max.

10mm

(SB) Alternating

(7B)

Flat

foot

(6B)

Roller

footorflat

(2B) Alternating

(2B/DF)

20mm

Cam

90.5mm

51mm

Cylinder

820X600mm

200mm

65Kg

LS3

400W.

6O0(5OHZ)

M62

Suitable for

luggages,

by

type

-

ditto

knee

lifter

bed

(tubular

x

400mm

4P

clutch

5O0(6OHZ)

sewingofshoes,

ultra

(Max.

differ

used

hook

width)

fiber

reverse

foot

-

motor

heavy

sewing

#24

from

and

feed,

reverse

feed

feed,

reverse

feed,

(walking

foot

(walking

(10mm

type

materials.

speed

the

feed,

will

above

types

materials

reverse

feed

be

changed

being

feed

according

sewn.)

feed

reverse

feed

shirring)

foot&presser

by

lever)

foot)

820)

bags, satchels, sport-goods,

by

Contents

1 Lubrication 1

2 Needle 1

3 Thread 1

4 Insertion

and

Removal 2

5 Winding the Bobbin Thread 3 6 Upper Threading 3

7 Tension of Bobbin Thread and Needle Thread 4

Adjusting Needle Thread Tension 4

Adjusting Bobbin Thread Tension 4

8 Pressure of Presser Foot 5 9 Adjustmentof Stitch Length 5

10 Timing of Thread Tension Releasing Mechanism 6

11

Removal of Shuttle Race Body 6

12 Adjusting on

(A)

(B) (C)

(D)

the

Each Points 7

Adjusting Needle Position Against Needle Hole of 7

the

Feed

Dog

{7B & 8B

Types)

Adjusting of Feed Dog Height 7 Adjusting theForward and Backward Position of q

Needle

BarFrame

Timing of Needle and Hook 8

13

14

CH-2B/DF

a. Use of b. Adjusting Upper Feed Length Against Lower Feed 11

CH-2-DF

Positioning of

Adjusting Adjusting

needle

the

height of needle bar 9

the

position of

and

tip of

the Clearance between needle Each timing for up/down strokes of

foot

the

Length

Adfusting

Adfudting

Positioning

Adjustment

Adjusting

(2B & SB

Differential Feed Mechanism 10

Types

Upper

Lower

Up/Down

Feed

Upper

only)

Length

Length 12

Feed

Dog 13

Amount

the

hook 9

tip of hook 9

and

tip of hook 9

presser

of

Upper

Feed

10

11

14

Positioning

presser

Bar

15

1

Lubrication

Lubricate all points indicated by arrows in figure.

2

Needle

Turnthe balance wheel over toward you untilthe needle bar reaches its highest point. Loosen

the

needle

asit

machine arm directly. Securelytighten itwith needle clamp screw

will

clamp

go,

screw

keeping

the

(1).

long

Hold

groove

and

insert

ofthe

the

needle

(2)

tothe

into

left

the

and

needle

bar

eyeofthe

(1).

holeupas

deeply

needleinline

with

3

Thread

For

needle

leftorright

andturnthe thread overtowardyoubetweenthe thumbandforefinger of

left-twistedthread

(Upper

twisted

thread)

will

use

left-twisted

thread.

To

find

wind tighter strands, and right-twistedthread

out

thread

only,

twist,

1 -

and

hold

for

bobbin

the

threadasshownbyillustgation,

(Lower

will

thread)

right

hand,andthen

unwind.

use

either

4

Insertion

§

RemovalofBobbin

and

Removal

of

Bobbin

Open the hook cover and drop-down the needle bar at lowest point,then insert the opener (3) between the snap spring

bobbin

case

outward,

then

(1)

and bobbin case

take

the

bobbin

(2)

and depress the snap spring and pull up the

outofthe

bobbin

case.

§

InsertionofBobbin

When inserting, pull

(5).

Pull

the thread upward passing through the thread slit

out

the

thread

and

depress

it,

then

insert

the

bobbin (4) in

(7)

of the bobbin case. Youcan pull

the

bobbin

case

out the thread through the thread passing hole through underneath the tension spring (6).

Make sure

shuttle.

that

the snap spring in the shuttle is clicked after pressing bobbin case into the

2 -

5

Winding

Bobbin winding should be made by the following order.

the

Bobbin

Thread

(l)Spool pin —

(2)

Thread guide

(arm)—(3)

Needle

thread tension thread guide — passing

through the clearance betweentwo tension discs —(4)

(5)Bobbin (winding several times) — (6)Move

Winding

6

Upper

volume

Threading

shouldbeadjusted

bythe

the

bobbin winding lever.

screw

(7)

and

Needle

thread tension thread guide

A

positioning

ofthe

moving

lever

(6).

Upper threading should be made bythe following order.

(I)

Spool

thread guideofthreadtension

(7)

Tensionspring —

(II)

Needle

—(2)

\|1^(1)

Thread

guide

ofthread

—(5)

(8)

Thread take-up —(9)Thread guide, face plat —(10) Needlecramp

Thread

tension

—(3)

controller-*^disc

Clearanceoftwo

wind

a time—

tension

(6)

discs

Thread

—(4)

guide

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