Nakajima 281LY-B User Manual

INSTRUCTION

BOOK&PARTS

BOOK

MODEL

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281LY-B

(Large rotary hook)

Single Needle, Lock Stich, Compound Feed Sewing Machine With

Automatic Thread Trimmer

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SEISAKUSHO CO.,LTD. J

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CAUTIONS

CONTENTS

BEFORE

OPERATING

THE

MACHINE

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CAUTIONS

1.

SPECIFICATION

2.

PREPARATION THE

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10 10

11 11

11 12

12

....

12

13

2-1

SETTING

2-2

CONNECTING

2-3

SYNCHRONIZER

2-4

UPPER

3.

CAUTION

3-1

LUBRICATION

3-2

ADJUSTING

3-3

INSTALLING

4.

HOW

4-1

SETTING

4-2

WINDING

4-3

THREADING

4-4

ADJUSTING

4-5

THREAD

4-6

THE

4-7

ADJUSTING

4-8

THREAD

4-9

ADJUSTING

4-10

TIMING

4-11

ADJUSTING

4-12

ADJUSTING AND

4-13

ALTERNATE PRESSER

4-14

ADJUSTING OF

4-15

POSITION

4-16

HOME

4-17

ADJUSTING

4-18

HOW

4-19

HOW

4-20

AUXILIARY

4-21

PRESSURE

4-22

STITCH

5.

PHENOMENA, ITS

CORRECTIVE

THE

WHEN

MACHINE

AND

TO

SET

NEEDLE

OF

FEEDING

THE

NEEDLE

POSITION

TO TO

LENGTH

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

UP

THE

INSTALLATION

LOWER

IN

USE

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

OF

THE

NEEDLE

THE

BOBBIN

THE

STITCH

TENSION

THREAD

THE

BOBBIN

TAKE

UP

THE

PRESSER

NEEDLE

THE

HEIGHT

THE

HEIGHT

FOOT

STROKE

FOOT

AND

THE

LONGITUDIAL

OF

THE

OF

THE

THREAD

MANUALLY REPLACE

THREAD

OF

THE

REASON

THREAD

TRIMMING

OPERATING

THE

MACHINE

..........

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

BEFORE

MACHINE

NEEDLE

OPERATING

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

WITH

MOTOR

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

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

STOPPING

POSITIONS

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

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

OILING

TO

THE

HOOK

PART

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

BELT

COVER

..

· .... · .... · ...... · .... ·

MACHINE

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

THREAD

UPPER

THREAD LENGTH

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

TENSION

THREAD

SPRING

BAR

REVERSE

AND

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

OF

AND

ROTATING OF

FEED

OF

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

FEEDING

THE

FIXED

PRESSER

AMOUNT

FRAME

FEED

ROTARY

TRIMMING

OPERATE

KNIVES

TENSION

KNIFE

SPEED

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

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

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

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

AND

REVERSE

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

TENSION

PRESSED

FOOT

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

CONTROLLER

FOOT

HOOK

DOG

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

FOOT

OF

.................................. · 9

POSITION

SOLENOID

KNIFE

CAM

THE

THREAD

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

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

..

· .... ·.......... 5

FEED

......... 7

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

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

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

.. · .. · ..

·.... 9

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

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

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

TRIMMER

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

........

10 10

10 11 II

11 12 12 12

AND

MEASURE

AT

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

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18

6.

COMPONENT

6-1

MACHINE

6-2

LIST

-1-

OF

PARTS

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

PARTS

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

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

14 14

18

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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

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CAUTIONS

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1) Never operate the machine without lubrication.

2)

3)

4)

5) Confirm the ratings of your power source

CAUTIONS

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1) Don't put your hand under the needle

2)

3)

4)

5)

BEFORE

After setting direction; lower the needle handweel's revolution by momentarily switching the power (correct rotational direction viewed Run

the newly installed machine at a speed of 2.000 for the first 4 week. Don't hold the machine by its synchronizer behind the handweel when you

move

on

the motor (power voltage, phase etc.).

switch and the machine is running. Don't put your hand into the thread take-up cover while the machine is running. Don't forget head backwards Never bring your fingers or hair close handweel, may

lead to serious personal injuries.

If

your machine

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

up

your machine, make sure that it runs

from

the handweel's end).

the machine head for installation.

IN

OPERATION

to

cut off the power supply before

or

replace the V-belt.

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

is

provided with a belt cover, finger guard and eye

OPERATION

in

the correct

by

turning the handweel and witch the

of

the hand wheel: counterclockwise when

s.p.m.

or lower

by

the machine plate stuck

when

you turn

to.

or place anything

"on"

you

tilt the machine

the power

on

"on"

the

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til

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13fwl&

Automatic backtacking device

m

Application

f~

Thread

ftv

Sewing speed

ftv'

Stitch length

~NM-A

Needle

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Presser

Sewing hook

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Lubrication

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Motor specifications

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MODEL

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(MAX)

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feet lift

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Needle

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SPECIFICATIONS

used

With backtacking by push button

Medium-heavy

;flflX.J:,f9

9mm by hand lever

Hand oiling (Hook

mm

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Large

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2P-400W

281LY-B

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and heavy weight materials

#

40-

# 8

2400

s.p.m

0-8

mm

38

mm

IUU:,f15mm

15mm by knee lifter

DPX17

#23

f/1~

rotary

hook

(1ii$13fiJJt~idJ)

part

lubricated automatically)

(Electro-motor)

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0 Lower the speed

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Use

M type of motor pulley

and V-belt.

thread was cut ated.

do component parts especially such as the bobbin case and bobbin.

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2.

PREPARATION

OPERATING

2-1

SETTING UP THE MACHINE

1) Install the machine on otherwise

2)

Positioning of knee lifter shown in the ing. cause

Wrong

operator

may

positioning of knee lifter will

BEFORE

THE

the

cause

excess vibration.

tireness

and low efficiency.

MACHINE

flat

surface

floor.

draw-

Fig 3

Cord Color

~lue

~ange

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Yellow Brown Green Red

(5

Ff

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14.

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Type

Solenoid

Switch

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of

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thread trimming

for

Reverse sewing

for

reverse

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sewing

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Mounting positions of the knee lifter and the oil pan.

Fig 2

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(Note) The knee lifter should be mounted before the

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2-2 CONNECTING THE

190

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MACHINE WITH MOTOR

0 Use motor's

tween

OSignal cord color of machine is shown in

the Fig3. instruction when connecting each cords.

0 White and black

this

machine.

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StH:liUttt"C <

thread

trimming speed

190-210

s.p.m.

Confirm carefully motor's

cords

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2-3 SYNCHRONIZER INSTALLATION

Install the shown in the Fig4 and then fasten screws. Fix to the V -belt.

synchronizer

the

cord by a nylon clamper so

and its accessosies

their

as

not to touch

1l:

as

set

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2-4 UPPER NEEDLE

:;.;

To determine the stopping positions

fr

the setting angle of the syncronizer sensor.

(Follow the instruction of the moter to be

used.)

Upper needle stopping position. Align the red marking of the machine pulley with the

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red marking on the front of the arm frame.

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3.

STOPPING POSITION

adjust

first, adjust the stopping positions without actuating the automatic thread trimming mechanism. Then confirm its positions by actuating the timming mechanism.

CAUTION

IN

USE

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3-1

LUBRICATION

0 Lubricate properly to all the oil holes

indicated by fore operation .

OOiling to the oil

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 during operation.

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periodically clean out any lint

maste around the hool and between the

feed rows.

arrows

as

reservoir

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3-2 ADJUSTING OF THE OILING

TO

THE HOOK

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 located

at

the left side of the oil reservoir. 0 Loosen the nut. OTurn OTurn

to the right

to the left

PART

(+side)

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for more oil. for less oil.

Fig

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3-3 INSTALLING PROCEDURE

1)

Insert belt cover support

i

i.flt

~

the tapped hole

2)

Fit belt cover

3)

Install side

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

and position it so that it does not

tact the machine arm or the belt cover

before fixing it with the wooden

screws.

in

the machine arm.

®onto

plate@.

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and ®

the support.

in

the belt cover.

in

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HOW

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THE

4-1

SETTING THE NEEDLE

Use

DP

X 1 7(

135

~

select correct size and number of it that

f1!

meets the material and the needle thread

'J

be

t!.

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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 keeping the long groove of the needle the left and the eye of the needle with the machine arm directly.

4) Securely tighten it with the needle clamp screw.

X 1 7) type needles. but

MACHINE

to

go,

to

in

line

Fig

;f.' 1!.;;

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12

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latch

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WINDING

OHow to wind the bobbin thread

r:

1)

Fasten

screws

wood wheel contacts correctly with belt.

2)

Pass

thread and wind the a few times.

3) When the thread is wound unevenly on

the bobbin, thread

4)

screw around

tension discbase to the left right. Adjust

so

THE

BOBBIN

the bobbin winder base with

where the bobbin winding

in

the

order

thread

around the bobbin

adjust

it by sliding the

to bobbin

that

the bobbin by about

the

winder thread

THREAD

from

adjusting

is wound

80%.

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to @

or

Fig 13

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To

o Removing the bobbin case

Remove the bobbin case by latch with fingers.

OThreading the bobbin thread

1)

Lead the

slot of bobbin case and pull the comes passing to the delivery eye of the bobbin

2)

Insert holding its latch with fingers.

Nlt

f.:j

(J)

f)'{

thread

through the

under

the tensions

the bobbin case into the hook by

flU: L "'C

~

Fig

14

(J)

raising

threading

JqfH: *-a-

thread

s~

ca.:se·.

:im

L i

its

Fig 14

-6-

4-3

THREADING THE

Turn

the pulley until the highest point and then lead the order

shown in Fig14.

UPPER

thread

THREAD

take-up moves to its upper

thread

in the