Nakajima 281ly-b User manual

INSTRUCTION

BOOK&PARTS

BOOK

MODEL

1

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281LY-B

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(Large rotary hook)

Single Needle, Lock Stich,

Compound Feed Sewing Machine

With

Automatic Thread Trimmer

<$>NAKAJIMA

SEISAKUSHO CO.,LTD. J

From the library of: Superior Sewing Machine & Supply LLC

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18

CONTENTS

page

CAUTIONS

BEFORE

OPERATING

THE

MACHINE

.......

2

CAUTIONS

WHEN

OPERATING

THE

MACHINE

..........

2

1.

SPECIFICATION

.............................................................

2

2.

PREPARATION

BEFORE

OPERATING

THE

MACHINE

................................................................

3

2-1

SETTING

UP

THE

MACHINE

................................................ 3

2-2

CONNECTING

THE

MACHINE

WITH

MOTOR

.......................... 3

2-3

SYNCHRONIZER

INSTALLATION

.......................................... 3

2-4

UPPER

AND

LOWER

NEEDLE

STOPPING

POSITIONS

............... 4

3.

CAUTION

IN

USE

..........................................................

4

3-1

LUBRICATION

................................................................... 4

3-2

ADJUSTING

OF

THE

OILING

TO

THE

HOOK

PART

.................. 4

3-3

INSTALLING

THE

BELT

COVER

..

·....·....·......·....·

..

·....·.......... 5

4.

HOW

TO

SET

THE

MACHINE

..................................

5

4-1

SETTING

THE

NEEDLE

....................................................... 5

4-2

WINDING

THE

BOBBIN

THREAD

.......................................... 6

4-3

THREADING

THE

UPPER

THREAD

....................................... 6

4-4

ADJUSTING

THE

STITCH

LENGTH

AND

REVERSE

FEED

......... 7

4-5

THREAD

TENSION

............................................................. 7

4-6

THE

NEEDLE

THREAD

TENSION

.......................................... 7

4-7

ADJUSTING

THE

BOBBIN

THREAD

TENSION

......................... 8

4-8

THREAD

TAKE

UP

SPRING

................................................. 8

4-9

ADJUSTING

THE

PRESSER

OF

PRESSED

FOOT

....................... 8

4-10

TIMING

OF

NEEDLE

AND

ROTATING

HOOK

.......................... 8

4-11

ADJUSTING

THE

HEIGHT

OF

FEED

DOG

............................... 9

4-12

ADJUSTING

THE

HEIGHT

OF

PRESSER

FOOT

AND

FEEDING

FOOT

·................·....·....·................·

..

·

..

·

..

·.... 9

4-13

ALTERNATE

STROKE

AMOUNT

OF

PRESSER

FOOT

AND

FEEDING

FOOT

..................................· 9

4-14

ADJUSTING

THE

LONGITUDIAL

POSITION

OF

THE

NEEDLE

BAR

FRAME

.............................................

10

4-15

POSITION

OF

THE

REVERSE

FEED

SOLENOID

.......................

10

4-16

HOME

POSITION

OF

THE

ROTARY

KNIFE

.............................

10

4-17

ADJUSTING

THE

THREAD

TRIMMING

CAM

...........................

11

4-18

HOW

TO

MANUALLY

OPERATE

THE

THREAD

TRIMMER

........

II

4-19

HOW

TO

REPLACE

THE

KNIVES

..........................................

11

4-20

AUXILIARY

THREAD

TENSION

CONTROLLER

........................

12

4-21

PRESSURE

OF

THE

FIXED

KNIFE

.........................................

12

4-22

STITCH

LENGTH

AND

SPEED

..............................................

12

5.

PHENOMENA,

REASON

AND

ITS

CORRECTIVE

MEASURE

AT

THE

THREAD

TRIMMING

..........................................

13

6.

COMPONENT

PARTS

...................................................

14

6-1

MACHINE

PARTS

...............................................................

14

6-2

LIST

OF

PARTS

·................................................................

18

-1-

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SPECIFICATIONS

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MODEL

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Thank

you

for your purchasing our sewing machines. Please carefully

read this instruction book before operating the machine to prolong ther

machine life and

to

keep the machine always

in

good

condition.

CAUTIONS

BEFORE

OPERATION

1) Never operate the machine without lubrication.

2)

After setting

up

your machine, make sure that it runs

in

the correct

direction; lower the needle

by

turning the handweel and witch the

handweel's revolution by momentarily switching the power

"on"

(correct rotational direction

of

the handwheel: counterclockwise when

viewed

from

the handweel's end).

3)

Run

the newly installed machine at a speed of 2.000

s.p.m.

or lower

for the first 4 week.

4)

Don't hold the machine by its synchronizer behind the handweel when

you

move

the machine head for installation.

5) Confirm the ratings of your power source

by

the machine plate stuck

on

the motor (power voltage, phase etc.).

CAUTIONS

IN

OPERATION

1) Don't put your hand under the needle

when

you turn

"on"

the power

switch and the machine is running.

2)

Don't put your hand into the thread take-up cover while the machine is

running.

3)

Don't forget

to

cut off the power supply before

you

tilt the machine

head backwards

or

replace the V-belt.

4)

Never bring your fingers or hair close

to.

or place anything

on

the

handweel, V-belt. bobbin winder wheel or motor during operation. It

may

lead to serious personal injuries.

5)

If

your machine

is

provided with a belt cover, finger guard and eye

guard. never operate your machine with any of them removed.

281LY-B

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Automatic backtacking device With backtacking by push button

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Application

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Thread

to

be

used

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Sewing speed

(MAX)

ftv'

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Stitch length

~NM-A

~o-7

Needle

bar

stroke

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Jil:

Presser

feet lift

n

Needle

~

Sewing hook

*'~

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Lubrication

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Motor specifications

If!

1!/-!JW

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l!/-!JW

Medium-heavy

and heavy weight materials

#

40-

# 8

2400

s.p.m

0-8

mm

38

mm

;flflX.J:,f9

mm

IUU:,f15mm

9mm by hand lever 15mm by knee lifter

DPX17

#23

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Large

rotary

hook

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(1ii$13fiJJt~idJ)

Hand oiling (Hook

part

lubricated automatically)

2P-400W

(Electro-motor)

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Use

M type of motor pulley

and V-belt.

0 Lower the speed

in

case the

thread was cut

by

over

he-

ated.

0 Please

do

use our selected

component parts especially

such as the

feed

dog,

hook,

bobbin case and bobbin.

From the library of: Superior Sewing Machine & Supply LLC

Fig 3

Cord Color

~lue

'

~ange

::.,

Yellow

Brown

Green

Red

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2.

PREPARATION

BEFORE

OPERATING

THE

MACHINE

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2-1

SETTING UP THE MACHINE

1) Install the machine on

the

flat

surface

floor.

otherwise

may

cause

excess vibration.

2)

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2)

Positioning of knee lifter shown in the

draw-

ing.

Wrong

positioning of knee lifter will

cause

operator

tireness

and low efficiency.

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(Note) The knee lifter should be mounted before the

motor is installed.

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2-2 CONNECTING THE

MACHINE WITH MOTOR

0 Use motor's

thread

trimming speed

be-

tween

190-210

s.p.m.

Type

of

Operation o 8

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OSignal cord color of machine is shown in

the Fig3. Confirm carefully motor's

instruction when connecting each cords.

0 White and black

cords

are

not used in

this

machine.

Solenoid

for

thread trimming

Solenoid

for

Reverse sewing

Switch

for

reverse

sewing

-3-

2-3

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2-3 SYNCHRONIZER INSTALLATION

Install the

synchronizer

and its accessosies

as

shown in the Fig4 and then fasten

their

set

screws.

Fix

the

cord by a nylon clamper so

as

not to touch

to the V-belt.

From the library of: Superior Sewing Machine & Supply LLC

Fig 5

Fig

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-4-

2-4 UPPER NEEDLE

STOPPING POSITION

To determine the stopping positions

adjust

the settingangle of the syncronizer sensor.

(Follow the instruction of the moter to be

used.)

Upper needle stopping position. Align the

red markingof the machine pulley with the

red marking on the front of the arm frame.

*At

first, adjust the stopping positions

without actuating the automatic thread

trimming mechanism. Then confirm its

positions by actuating the timming

mechanism.

3.

CAUTION

IN

USE

3-1

LUBRICATION

0 Lubricate properly to all the oil holes

indicated by

arrows

as

illustrated be·

fore operation.

OOiling to the oil

reservoir

situated in the

under the machine bed.

Supply the oil up to the level of marking

line shown in the Fig8 when the amount

of oil became less than X to the level

during operation.

*

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periodically clean out any lint

or

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maste around the hool and between the

feed rows.

3-2 ADJUSTING OF THE OILING

TO

THE HOOK

PART

When it is necessary to change the oiling

amount to the hook according to the

materials to be sewing, adjustment is done

by the oiling amount adjusting

screw

located

at

the left side of the oil reservoir.

0 Loosen the nut.

OTurn

to the right

(+side)

for more oil.

OTurn

to the left

(-side)

for less oil.

From the library of: Superior Sewing Machine & Supply LLC

Fig

10

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3-3 INSTALLING PROCEDURE

1)

Insert belt cover support

CD

and ®

in

the tapped hole

in

the machine arm.

2)

Fit belt cover

®onto

the support.

3)

Install side

plate@.

4)

Tilt the machine head . and check that

the belt cover does not touch the belt

slot

in

the machine table.

5)

Place bobbin winder

in

the belt cover.

and position it so that it does not con-

tact the machine arm or the belt cover

before fixing it with the wooden

screws.

4.

HOW

TO

SET

THE

MACHINE

4-1

SETTING THE NEEDLE

Use

DP

X17(

135

X 17) type needles. but

select correct size and number of it that

meets the material and the needle thread

to

be

used.

1)

Turn the balance wheel over toward

you

until the needle bar reaches its

highest point.

2)

Loosen the needle clamp screw.

3)

Hold

and insert the needle into the

needle bar hole as deeply as it will

go,

keeping the long groove of the needle

to

the left and the eye of the needle

in

line

with the machine arm directly.

4) Securely tighten it with the needle

clamp screw.

From the library of: Superior Sewing Machine & Supply LLC

;f.' 1!.;;

.fiJI

.it

Trip

latch

Fig

12

Fig 13

Fig 14

k~J.Ht~nnt:1

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4-2

WINDING

THE

BOBBIN

THREAD

OHow to wind the bobbin thread

1)

Fasten

the bobbin winder base with

wood

screws

where the bobbin winding

wheel contacts correctly with belt.

2)

Pass

thread

in

the

order

from

CD

to @

and wind the

thread

around the bobbin

a few times.

3)When the thread is wound unevenly on

the bobbin,

adjust

it by sliding the

thread

tension discbase to the left

or

right.

4)

Adjust

to bobbin

winder

adjusting

screw

so

that

the

thread

is wound

around

the bobbin by about

80%.

oRemoving the bobbin case

Remove the bobbin case by

raising

its

latch with fingers.

OThreading the bobbin thread

1)

Lead the

thread

through the

threading

slot of bobbin case and pull the

thread

comes passing

under

the tensions

s~

to the delivery eye of the bobbin

ca.:se·.

2)

Insert

the bobbin case into the hook by

holding its latch with fingers.

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4-3

THREADING THE

UPPER

THREAD

Turn

the pulley until the

thread

take-up moves to its

highest point and then lead the

upper

thread

in the

order

shown in Fig14.

From the library of: Superior Sewing Machine & Supply LLC

Fig

15

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Fig

16

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Touch back

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Fig 17

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4-4

ADJUSTING

THE

STITCH

LENGTH

AND

REVERSE

FEED

Turn

the stitch length regulating dial, and

set

the desired figure the dial to the

indicator pin.

The

figures of dial show the stitch length

by milimeter. When adjusting the stitch

length from longer one to

shorter

one,

turn

the dial with the

reverse

stitch lever

pressed down.

* Reverse stitch

1)

Press down the reverse stitch lever.

During the lever is pressed down. the

machine sews backwards.

2)

When the lever is released,

it

automati-

cally

turns

to its original position and

the machine sews forward.

*Touch back

1)

Depress switch, and the machine will

imediately run

in

the reverse direction.

2) Reverse stitch is made as long

as

you

keep depressing the switch.

3) Release the switch for forward sewing.

0 Position of the switch.

Adjust the position of the switch for

your convenience. Loosen set screw and

adjust the position of the touch back

swicht

as

desired.

4-5

*•.:r

4-5 THREAD TENSION

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WELL SEWN (Upper and lower

thread

well link-

aged at the center of fabric)

NO

GOOD

(Upper thread tension too strong

or

lower thread tension too weak)

NO

GOOD

(Upper thread tension too weak

or

lower

thread tension too strong)

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4-6 THE NEEDLE THREAD

TENSION

Turn

thread tension nut clockwise to

increase

or

counter clockwise to reduction

the needle thread tension.

-7-

From the library of: Superior Sewing Machine & Supply LLC

*-~'H·tJ

t

Thread tension

screw

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19

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Fig 23

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4-7 ADJUSTING THE BOBBIN

THREAD TENSION

Adjustment is done by

turning

the

thread

tension

screw

toward

right

or

left.

Proper

tension when the bobbin

thread

is pulled

out

from

the

bobbin case will be about

30

-

50g

of which tension the bobbin

case

is

not fallen by its weight.

4-8 THREAD

TAKE

UP SPRING

0

When

you

want

to change the

stroke

of

the

spring.

1)

Stroke

of take-up

spring

is

adjust

by

moving

stopper

to

the

left

or

the

right

after

loosening

stopper

screw.

2) Move the

stopper

to

the

right

to

incr~

or

to

the

left to reduce the

stroke

o .

take-up spring.

~

--

__

__,'

0 When you want to change the tension of

the spring.

1)

Tension of the take-up

spring

is adjust-

ing

by

turning

stud

counter

clockwise to

increase

or

clockwise to reduce

after

loosening nut.

4-9 ADJUSTING THE

PRESSER

OF PRESSED FOOT

Turn

the

pressure

adjusting

screw

A to

the right to increase

the

pressure,

and to

the left to decrease. Set the

pressure

adjusting

screw

B to position

around

8

mm.

After adjusting, fix both

screw

A and

B with nut.

4-10 TIMING OF NEEDLE

AND ROTATING HOOK

For

the

standard

method of the

sewing

hook timing please follow

as

under;

1)

Turn

the

balance wheel

over

toward

you until the needle reaches to

the

position of 2.2mm from its lowest point.

2)

At

this

position, the blade tip of

the

hook should be

at

the

center

line of

the

needle.

3) At

this

instant.

the

clearance between

the blade tip of

the

hook and the

upper

part

of

the

needle hole should be 2.0mm.

4) Install

the

hook so

as

to obtain

0.05mm

clearance between

the

blade tip point of

hook and the

side

part

of needle.

Note: When

setting

the

timingof

the

needle

and

the

hook, be

sure

to

set

the

stitch

adjusting

dial to

..

0

".

From the library of: Superior Sewing Machine & Supply LLC

Mf;f,:,;

Screw

Fig

24

Fig

25

Fig 26

Fig

27

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4-11

ADJUSTING THE HEIGHT

OF FEED DOG

Feed

dog is

factory-adjusted

to

just

out

1.2

mm

from

the

surface

of

throat

plate.

When

the

feed dog

height

needs

to

be

adjusted

according

to

the

sewing

specifica-

tions

or

after

the

feed dog

is

replaced, do

as

follows:

1) Loosen

screw.

2) Move

the

feed

bar

up

or

down to

perform

adjustment,

then

securely

tighten

the

screw.

4-12

ADJUSTING

THE

HEIGHT

OF

PRESSER

FOOT

AND

FEEDING

FOOT

When sewing much cushioning and stepped

materials. change the height of

presser

foot and

feeding foot according to the material. which

will be very effective for better seam.

When changing the height of presser foot and

feeding foot,

1)

Loosen the

nut

of cam rod connecting shaft.

2)

When it is fixed the upper end of the oblong

hole, the height it increased.

3) When

it

is fixed at the lower end of the

oblong hole. the height is decreased.

4) After adjusting, tighten the nut firmly.

4-13

ALTERNATE

STROKE

AMOUNT

OF

PRESSER

FOOT

AND

FEEDING

FOOT

The lifting amount of

presser

foot and feeding

foot is set to same amount in the factory before

delivery. But it is effective for better sewing the

lifting amount of presser foot and feeding foot

according to the sewing material. For example,

it will be often effective to make the lifting

amount of feeding foot bigger than

presser

foot

lifting amount when sewing slippage and step-

ped material.

When changing lifting amount.

1)

Bring down the

presser

lifting lever.

2)

Turn

the

hand

wheel untill

the

lower

surface

of

presser

foot

and

feeding foot

comes

on

the

same level

with

upper

sur-

face of needle plate,

and

in

this

position.

loosen

the

clamp

screw

of

the

feed arm.

3)

From

this

position,

turn

handwheel

to

your

side

and

tighten

the

screw,

then

the

lifting

height

of

the feeding foot becomes

higher

than

the

presser

foot.

4)

From

the

same

position,

if

you

turn

the

hand

wheel

to

opposite

side,

the

lifting

amount

of

the

presser

foot becomes high-

er

than

the

feeding foot.

5)

The

more

the

hand

wheel is

turned,

the

bigger becomes the difference of

the

lift-

ing

amount

between feeding foot

and

presser

foot.

From the library of: Superior Sewing Machine & Supply LLC

Nakajima 281LY-B User manual

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