Seiko LSW-27BLK, LTW-27B, LTW-27BK, LTW-27BM Instruction Manual

OPERATING

LSW-27BLK

INSTRUCTIONS

MODELS

LTW-27B,

•27BK,

-27BM

SEIKO

SEWING

TOKYO•JAPAN

MACHINE

CO.,

LTD.

SPECIFICATIONS

SPEED:

Maximum 3,500 r.p.m. (LSW-27BLK 2,400 r.p.m.)

NEEDLE: DPX7,

HOOK:
FEED:

STITCH

LIFT

OILING:

SIZE

MOTOR:

DIAMETER

OF

OF

Rotating hook
Drop

LENGTH:

PRESSER

Semi-self oiling system

BED:

177

250W, 2P clutch motor

OF

MOTOR

(LTW-27BK•27BM•LSW-27BLK50cycle

NEEDLE

GAUGE:

(LTW-27BK . 27BM 2,800 r.p.m.)

#9to#20

feed

and

5mm

FOOT:

mmX518

1/16"

(LSW-27BLK DPX7, #11 to #22)

needle feed

(LSW-27BLK 6.5mm)

7 mm (by a lever)

mm

PULLEY:

to

1-1/2"

50 cycle

(LTW-27BK.LSW-27BLK,

(LTW-27BM,

5/16"

80^6,

standard)

60 cycle

6656,60cycle

1/8" to 1/2")

65,6

55?^)

CONTENTS

Page

Setting up the machine 1
Oiling I
Oil adjuster 2

Needle 2

Thread

Inserting
Winding
Threading

Regulating

and

removing bobbins 3

bobbins

the

the

and

its adjustment 3

machine 4

thread

tension 5

Adjustment of the presser foot pressure 5
Adjusting the stitch length 6
Reverse stitch 6

3

INFORMATION

FOR

ADJUSTMENT

Replacement of the timing belt 6
Adjusting the height of the feed dog 7

Adjusting the timing of the needle plate, needle and feeder 7

Adjusting
Timing
Timing
Adjusting

the

heightofthe
between
adjustment 9

the

the hook

clearance 10

needle

and

bar

needle 9

Relative position between bobbin case and opener 10

Adjusting the height of the presser foot 11

Fine

adjustment of the needle feed 11

Changing the needle gauge 11

SPECIAL

SPECIAL

INSTRUCTIONS

INSTRUCTIONS

FOR

FOR

MODEL

MODEL

LTW-27BK

LTW-27BM

&

LSW-27BLK...12

20

8

LSW-27BLK

SETTING

UP

THE

MACHINE

Before setting up the machine on the table, attach the relative parts to

the

table.

1. Hinge 2. Motor 3. Oil pan

4.

Oil

7.

10.

13.

OILING

bottle

Treadle

Cushion

Bobbin

rubber

winder

Fig.

1

5.

Knee

lifter

6.

Stand

8. Machine rest pin 9. Cotton stand

11.

Head

of

machine

12. V

Fig.

belt

1

Do not operate the machine, even if for testing, unless it has been pro

perly oiled.

(1)

To

fill

oil

in

the oil reservoir on top of the

filler

hole (A. Fig. 2) until the oil level reaches to the upper reference line

the

oil

window

(B.

Fig.

2).

machine,

pour oil through the

Oiling is automatically made by the vibration of the machine while sewing

operation through oiling wicks in the machine, and oil

when the operation of the machine ends.

Fig.

2

flow

stops automatically

Fig.

3

(2)

The

hook

mechanism

the

machine.

Push open the slide-plates in the bed and pull out the oil

Fig.

2).

should

receive

careful

attention whenlubricating

gauges

(C.

Fill oil in the reservoirs for the rotating hook mechanism up to the level

marked on each oil gauge.

Care

must

be

taken

that

oil flow stops

when

oil level falls to

the

bottom.

(3) Oiling adjustment to the hook mechanism.

The maximum oil

flow

is made when the reference line on the oil adjusting

knob (2) is in a line with the point (1), and it stops when the reference line

is

upright.

To adjust this, loosen the pinch screw (3) and turn the oil adjusting knob,

tighten

OIL

the

pinch screw.

ADJUSTER

Oiling to inside of arm top cover is automatically made by the vibration

of the machine while sewing operation.

Stop oiling temporarily by the following method at your option in case

of long sewing operation.

When point of the dial enters into point of arm bed cover after turning

the dial, the dial goes, down and oiling stops completely.

NEEDLE

The

size of the needle to be used should be determined by the size of

the thread, which must pass freely through the eye of the needle.

To

insert the needle,

turn

the

machine pulley over toward you until the

needle bar (1) moves up to its highest point, loosen the needle set screw (2)

and

put

the needle up into the needle bar as far as it will go, with the long

groove of the needle toward the inside direction and tighten the needle set

screw

securely.

OIL

ADJUSTER

Fig.

4

THREAD

CoUon,

synthetic or silk tliread can be used according to your purpose.

Normally left twist thread is used, but right twist thread is recommended

in the left-hand needle for perfect stitching.

INSERTING

Raise the neetlle bar to its highest

AND

REMOVING

BOBBINS

iK)int

and push open the slide plates

(1). Pull up the latches (2) of the bobbin cases and lift the bobbins (3) out

of

the

index

bobbin

To

finger

cases.

insert

a full bobbin in

the

bobbin case, hold it between

thumb

of your hand. Place the bobbin on the center post of the bobbin

and

case and push down the latch (2). Be sure that the thread draws out from

the

bobbin

Pull the thread into the slot (4) and between the bobbin

from left to right.

ca.se

ojjener (5)

and the projection (6) and under the tension spring (7). Draw out about

5 mm of the thread on the needle plate and close the slide plate leaving a

sufficient

WINDING

space

BOBBINS

for passage of

AND

the

ITS

ADJUSTMENT

thread.

Push a bobbin on the bobbin winder spindle (1) as far as it will go. Pass

the thread from the thread stand downward through the eye in the tension

bracket, then between and around the back of the tension

thread

several

forward

times

toward

around

the

the

bobbin

bobbin.

and

wind

from

belowinclockwise

disc,

bring the

direction

Push the bobbin winder lever (3) downward until the wheel (2) contacts

the

drive

belt

and

then

start

the

machine.

Fig.

Fig.

5

6

After

the

bobbin

from the belt and winding will stop. Cut the thread and remove the bobbin

from

the

spindle.

is filled

with

thread,

release

will

cause

wheeltodisengage

Adjustment screw (5) can be turned in or out to increase or decrease the

amount

of

thread

wound

on

the

bobbin.

When fine thread is wound on bobbins, use light tension, it is regulated

by turning the knurled nut (6) on the tension bracket at the rear of the

bobbin

winder.

Bobbin can be wound while the machine is sewing.
If the thread does not wind evenly on the bobbin, loosen the screw (4)

in the tension bracket and move the bracket to right or left as may be

required, then tighten the screw.

THREADING

Raise the needle bar to its highest point.

From the thread stand, lead the thread to the thread guide

top of the

(B)

from right to left. Pass the thread in weaving

two holes in (2), (B) and from right to left over and between the tension

THE

machine,

MACHINE

down

to the upper

guide

hole

of the thread

fashion

(1),

(A) on

guide

(2),

through the other

discs (3), (C). Now pull the thread downward from right to left beneath

and around thread controller (4), (D), continue to pull the thread upward
through the fork in the thread controller and against the pressure of the

check spring (5), (E) and through the thread guide (6), (F) pull the thread

upward through the eye in the take-up lever (7), (G) down through the
thread guide (6), (F) again and then through the thread guide (8), (H) and

(9), (I) down through the hole (10), (J) in the needle holder and from inside

to outside through the eye (11), (K) of the needle.

?

28

ltj

Fig.

7

REGULATING

For

ordinary stitching,

be

equal

on either thread is stronger

result.

If the tension on the upper thread is greater than

it

will be straight along

the

If

THE

so as to

tension on

THREAD

lock

the

TENSIONS

the

tension of

both

threads

than

the

upper surface of

lower

threadisgreater

the

upper

and

in

the

centerofthe

on the other, imperfect stitching will be the

that

the

fabric.

than

thatonthe

the lower thread will lie straight along the underside of

Perfect stitching

lower threads should

fabric.

If

the

tension

on the lower thread,

upper thread,

the

fabric.

A.

Tight tension of needle

Loose

tension

Fig. 8

TENSION

To

adjust the tension of the upper (needle) thread, turn the serrated

OF

THE

UPPER

THREAD

of

needle

thread

thread

(1) to the right for increasing tension. If you desire to decrease it,

nut

to

the

left.

B.

TENSION

OF

THE

BOBBIN

THREAD

It is regulated by means of the tension screw (1).
To increase the tension, turn the screw to the right, and to decrease it,

turn

the screw to the left by a screw driver.

ADJUSTMENT

OF

THE

PRESSER

FOOT

PRESSURE

The pressure of the presser foot is regulated by the adjusting screw

To increase the pressure, turn the screw to the right and to decrease it

to

the

left

by

a screw driver.

turn

nut

the

(1).

Fig.

10

Fig.

11

ADJUSTING

The

the

down

of

the

machine

the

handwheel

In

due

a notch in

plunger
wheel,

down

either

marking

on

the

handwheel

ence

mark

plunger.

THE

STITCH

LENGTH

stitch length is changed by pressing

button

the

with

(D, Fig. 2) in the bed plate

andbysimultaneously
slowly

course,

the

toward

plunger

you.

will

feeding mechanism. Hold

and

continuetoturn

forward

the

on

the

or

desired

coincides

arm.

rearward,

number

with

Then

enter

the

until

of

the

release

turning

into

the

hand-

the

stitches

refer

the

Numerals on pulley

show

stitch

number

per

of

inch

Stitch length

(m/m)

REVERSE

To

depress

When

as required.

REPLACEMENT

1.

INSERTING

Turn

highest

Turn

STITCH

do tacking for the purpose of locking the ends of seams, rapidly

and

release the lever (E, Fig. 2).

reversing feed of the machine, keep the lever (E) depressed as long

For

all other forward stitching, the lever remains in up position.

OF

THE

THE

the

balance wheel

TIMING

BELT

toward

BELT

you until

the

take-up

lever reaches to its

point.

the lower shaft (1) until the arrow mark on the lower shaft bearing

collar (2) meets with another arrow mark on the timing plate (3).

Insert a new timing belt into the belt pulley at this position.

I