Juki LZ-271 Instruction Manual

MODEL

LZ-271

HIGH

EMBROIDERING

SPEED.

INDUSTRIAL

SINGLE

SEWING

NEEDLE.

MACHINES

Instruction

Book

TOKYO

JUKI

INDUSTRIAL

L2-27t

CO..LTD.

CONTENTS

I.

GENERAL

1

2

3
4

5 Bobbin winder spool pin

6 Specifications 5

II

HOW

1

2 Oiling the

3

4
5

6 Inserting
7 Fixing
8 Embroidering

9 How to

10

11

12

13

DESCRIPTION

Special

features

Namesofparts

Sewing
Installing

Lubrication

TO

speed

the

OPERATE

rotary

Needles

Threading
Winding

the

the

the

the

zigzag width of

setupthe

How

to

embroider

The

thread

When

Howtouse

the

tension

thread

the

machine

••••

THE

MACHINE

hook 6

machine

bobbin

bobbin into

thread

the

bobbin case 10

throw

with

a fixed zigzag width of

throw

embroidering hoop 12

breaks

attachments

1

2

3
3

4

6

7

8
9

10
12

13

13

14

15

III

ADJUSTMENT

1

2

3

Timming

Adjusting

Matching

OF

and

the

the

STITCHING

adjustment

correct

rotary

position of

hook with

of needle throw 17

the

needle

the

needle 19

throw

17

1.

Special

features

I

GENERAL

DESCRIPTION

This is a high

speed

industrial sewing machine for embroidering. With

a speed of 1,700 stitches per minute, it can produce a width of throw of

12m/m (15/32") but if the machine is used at lOm/m (25/64") width of

throw, it can embroider at a fast speed of 2,000 stitches per minute.

This machine can, not only embroider designs on light weight or heavy

weight materials,
produce

attractive

butitcan

and

also

embroider

inviting embroidered work.

names

and

all kinds of

marks

to

Fig. 1 Complete View

The

design of this machine is of beautiful two-color tone and as the

lubrication is of a centralized system, it is not necessary to oil the parts

at

each

to

2.

instance. Also, as the presser

push

the

Names

presser

of

parts

bar

up or down

bar

is of joint rod system, it is

when

installing an

attachment.

not

Refer to Fig. 2 for the names of parts of this machine

(J)

Link

take-up

<3)

(D

(7)

Frame

Frame

Tension

thread guide, upper

thread

guide,

lower

disc

(D Zigzag width regulating knob
® Zigzag width graduator

©

Hand

wheel

Take-up

Thread

Three-hole

spring

take-up guide

thread

Needle thread guide pin

Zigzag width regulating lever

Bobbin winder spool pin

— 2 —

eyelet

3.

Sewing

speed

As previously mentioned, the speed of this machine at the maximum

zigzag width of throw of 12m/m(15/32") is ,1700 stitches per minute and

when the zigzag width is less than 10m/m{25/64''), it can embrioder at the

speed of 2,000 stitches per minute.

The rotation of the machine determines the sewing speed. The number

of rotation varies with the electric cycle and the diameter of the motor

pulley.

(RefertoTable)

Speed

1700

2000

Cycle

50-0

60-O

50-O

60-O

Motor

MTK-P0075000

MTK-P0065000

MTK-P0095000

MTK-PV080000

pulley

Unless otherwise requested, this machine's motor pulley is of l,700s.p.m.

type but if a different speed is desired, please order our agents or exclusive
dealers.

phase 200

highly

4.

(A)

if it's uniformly even.
but

of which

corner

deep inside

The

power of the clutch motor attached to this machine is a single

Watt

(1/4HP), so to ensure a long life of this machine, it is

recommendedtouseamotor

Installing

Correct

Install

if any one of

When

and

Unless

the

machine

height

the

machine

on

the

When

the

corners is uneven, it will rattle.

it rattles, nail in a thin felt cushion pad B (B-8208-012-000) (four

areinthe

make

the

the

accessories box together with nails),

the

height

pad

until it sinks into it.

even. Be

height of the machine is installed evenly, it will not rotate

pulleyofl,700s.p.m.

table

and

shake

all

the

corners

suretonailinthe

speed.

the

machinealittle

are

even it should not move

^

under

headofthe

the low

to

see

nail

— 3 —

quietly.

(B)

Leather

belt

Normally, this machine uses a leather belt, but following should be

observed:

(1)

Should not be too tight. At first, the leather belt is very stiff, so

often it is liable to be too tight- When it's too tight, the machine will

vibrate.

(2)

Joining

of the belt. Normally,

the

belt is joined with a wire.

When the joining is out of alignment or when the wire is sticking out, the

machine

cannotberun

(3)

Positions of

smoothly.

hand

wheel

and

puUcy- Unless the

hand

wheel

and

pulley are in correct positions, the belt might be curved or twisted, hampering
the quiet running of the machine. In such cases, move the motor position

and

5.

correct

Bobbin

For

them.

winder

spool

pin

the convenience of packing, the needle thread guide pin

and

the

bobbin winder spool pin are removed from the machine and packed sepa-

ratery

in a vinyl bag.

The

needle

thread

install the bobbin winder spool pin, remove the top cover of the machine.

Just

loosen

the

screw at

insert the bobbin winder spool pin from front, plug in the
and

tighten it with a wrench. (Fig 4)

guide

pin

the

top of the cover

can

be lightly

tappedinand

and

it will come off.

inserted.

nut

from rear

To

Then

Fig- 3 (D Needle thread guide pin ® Bobbin winder spool pin

6.

SPECIFICATIONS

Model

Sewing speed-

Width

of

throw-

Needles

Lubrication

Usage

Adjustment

of

throw

of throw Adjusted by the knee lifter (without setting

of width

Single needle, lockstitch, embroidering sewing

machine

Up

to 2,000 s.p.m. (width of

(25/64")

Standard 1.700

0~l2mm

DBxl

Centralized
Embroidering

heavy

and

s.pm.

C15/32")

it9~itl8

(16x231,

hand

work on all light weight,

heavy weight materials

indicator of width

oiling type

graduation)

throw

1738)

max.

10mm)

Standard

medium

#11

Attachments Possible to install compass embroidering and

cord

embroidering

Sewing space 270 mm {10—5/8") (From needle drop to the

Sewing

Size of

space-

bed

rootofthe

178mmx477mm

arm)

attachments

(7-1/64"x

18-25/32")

Lubricating oil New Defrix Oil No. 1

II. HOW TO

1.

Lubrication

Lubricate the oil holes marked in red with New Defrix Oil No.l, 1 to 2

drops

every

day

(Fig.

heavy

red

mark,

lubricate

reservoirs on these holes and from here all the essential parts are supplied

with

oil.

5).
about

OPERATE

But

to the

5 to 6

THE

holes

drops

MACHINE

(i)

(3)

® ®

every

day.

marked

There

with

are

oil

Fig.5Oiling

2

Oiling

hook

is inside the hook and lubricates all the essential parts of the rotary hook.

the

rotary

Every day drop 1 or 2 drops of oil to the hook groove of the rotary

shown

by the

hook

arrowinFig.6.This

— 6 —

holes

oil soaks

through

the felt

which

Fig.

3.

6 Oiling

Needles

spotsofrotary

hook

Select the needles according to the embroidering material and the

needle

thread.

In setting the needle, be

and

the groved

Material

Light

weight

Medium

heavy

(RefertoTable).

part

of the needle is facing the operator. (Fig. 7)

Scarf
Handkerchief

Blouse

Velvet

sure

DBxl

(IGx23l)

9—Sll

DBxl

(16x231)

?11—J|14

that

the carved

Embroidering

(Double-thread

i75—•?120

Embroidering

(Double-thread

S102

part

Needle

is on

thread

thread

thread

twist

twist

the

silk)

silk)

other

side

Heavy

weight

Name

Heavy

mark

weight

DBxl

(16—231)

#11-S14

DB—1

(16x231)

314-j|l8

All

color

250

cotton

thread

Groove

Needle eye

4.

Threading

the

machine

To pass the needle thread,

follow

as

the

shown

numerical

in Fig. 8.

order

Start

from the needle thread guide

pin (J), (not shown in Fig. 8),

to

the

needle

(D in

order,

(Refer to Fig. 2 for complete

view)

(2)

Three-hole thread eyelet

(3)

®

Take-up
Thread

(D
(D

Thread

(Z)

Frame

upper

(D

Frame

lower

(§)

Needle

Tension

disc

spring
take-up guide
take-up

thread guide,

thread guide,

-ai_

I

5.

Winding

the

bobbin

thread

As the wound condition of the bobbin thread greatly afTects the sewing

condition,

and

be

very

careful

the tightness of

First,

insert the bobbin deep into the bobbin

the

on

wound

the

thread.

amount

wound,

the

winder

methodofwinding

shaft

as far it goes

(Fig. 9). Pull out the thread from the thread spool, pass it through the

eyelet of the thread tension base, wind it from the opposite side of the 2

3~4

tension discs towards you (Fig. 10), and wind it

from

under

(Fig. 11). If

the

bobbin winder will contact

the

trip latch is pressed down with your

the

belt (Fig. 12).

times around the bobbin

thumb,

Inserting

Fig.

bobbintothe

Fig.

11

Winding

the

9

bobbin

winder

shaft

Passing

Pressing

tlie

Fig.

bobbin

Fig.

down

10

thread

12

the

trip

latch

When

the machine is rotated,

and

sufficient amount of thread is wound

around the bobbin, the trip latch will be released and the winding is finish

ed.

6.

Inserting

the

bobbin

into

the

bobbin

case

Hold the wound bobbin between your thumb and forefinger of your

right

hand

and, with the thread hanging down, insert it into the bobbin

case.

Next,

pass

the

thread

the

bobbin case, duck it under the thread tension spring of the bobbin case

while pulling it,

and

finally pass it

(Fig. 13)

which

through

is sticking out

the

wire of the

through

the groove of

thread

guide.

13

width

Thread guide

Part

namesofthe

of

N.

throw

Tension

screw

Latch

adjusting

bobbin

case

7.

Fixing

the

Thread

tension spring /

Fig.

zigzag

The zigzag width of throw of this embroidering machine can be regu

lated by the knee press as shown in Fig.

14.

From your sitting position,

make certain that the knee press smoothly contacts the tip of your right

knee

(Fig.

15).

If your knee is not correctly contacting the knee lifter, adjust it by

loosening

the

screw (J) Fig. 14.

—

10

—

Fig.

Actionofthe

14

knee

press

Correct

Fig.

contacting

of

the

15

knee

position

press

Rotate the machine slowly

and

if the knee press is pressed with your

knee, the needle will vibrate right to left and the embroidering can be pro

ceeded.

The

more the knee press is pressed with your knee, the greater

becomes the zigzag width of throw. (Fig. 16)

Fig.

16

Relation

between

the

knee

press

— 11 —

and

widthofthrow

8.

Embroidering

with

a fixed zigzag

widthofthrow

When you want to embroider with a definite, fixed

zigzag

width of

throw, loosen the zigzag width regulating knob, pull the lever at the right

of the knob, set the graduator at the width desired by moving the graduator
with your knee and tighten the knob. This will set the graduator at the

fixed width, so you can do a fixed width embroidering job without moving

your

knee. (Fig. 17)

Fig.

17 T)

Zigzag

width

(D

Zigzag

width

regulating

regulating

knob

lever

9.

Howtoset

up

the

embroidering

hoop

It will be necessary to do all kinds of embroidering with various zigzag

width of throw. So, in each instance, loosen the zigzag regulating knob and

adjust

the

width

to your liking.

Before starting the embroidering, the cloth must be stretched into the
hoop. The stretched cloth inside the hoop should not be too loose or too
tight but should be just right all around. If it's too loose, it might invite
skip-stitching but if it's too taut on a light weight materials, the cloth might

rip. So in such a case, attach a heavy cloth around the hoop together with

the light weight material

ched

light weight material.

and

pull this heavy weight material with the stret

—

12

—

10

How

to

embroider

Press down the cloth inside the hoop with your two hands and by set

ting the

zigzag

width with your knee, start embroidering. Be careful not

to press down on the cloth too much but just enongh to keep it down be

cause if too much pressure is applied on your two hands, you cannot do a

good embroidering job.

ment of your hands to produce a

Fig.

18

Howtoembroider

Your

knee

action must harmonize with the move

flawless

embroidering

Fig. 19 Example of embroidering job

work.

11

The

thread

The

upper thread tension and bobbin thread tension of this machine

tension

can be set independently of each other. The upper thread tension can be

adjusted by the tension nut (Fig, 20) and the bobbin thread tension can be

adjusted

thread

then the upper thread tension is fixed by the thread tension

by the

tension of the bobbin

bobbin

case

thread

thread

tension

inside the bobbin case should be set

screw

(Fig.

13).

Normally,

nut

to obtain

the

and

ideal tension. In an embroidering work, the thread tensionshould be adjust

ed so that the upper thread should come out on the back of the cloth, a

—13—

stitching process quite different than conventional stitching.

As shown in Fig. 21, it is considered to be ideal for the sewing width

of the bobbin thread to be about

leave

the

thread

Fig. 20 Thread tension nut Fig. 21 Thread tension for embroidering

12

When

the

tension

thread

nut

Stronger

Weaker

breaks

1/3

of the entire zigzag width.

a little loose to

obtain

an ideal

thread

Try

to

tension.

* The embroidering thread is a

break on a

fine,

crip day, on a rainy day or when the air is damp or when

fine

thread, and even though it does not

the humidity of the working compound is high, the breakage percentage is

very high.

Besides these adverse conditions, when the machine is not handled right,

the thread might break. Following are some of the mishandlings of the

machine:

A) When the passing of the needle thread is wrong or it's slippedout.

B)

The

needle thread is not wound around the thread spindle.

C)

When

the bobbin thread is all gone or when it's broken.

D)

When

the rotary hook is installed wrong.

(When especially large size of needle is used,match the sewing hook

to corresponding size.) (Refer to Chapter III-3 on "Timing the

sewing hook with the needle)

—

14

—

E) When the needle thread tension is too bad.

F)

When

the

needle is curved.

G)

When

the

deflector

(Smooth

13.

Howtouse

(1)

Compass ,

In

embroideringacircularorsemi-circular

width,

made

finite

shortness

BAO

bar and use it as shown in Fig. 23.

use

very

width

of the

Presser

the

easily.

and then

bar

out the

the

attachments

compass

In

presser

joint

(Fig.

this

embroider.

bar,

rodB)Fig.22(in

pointofthe

bruisebysome

23)

andanaccurate

case,besuretoset

When

attachapresser

this

the

bar

sewing

hookisbruised.

kindofpapery

shape

withafixed

embroidering

the

zigzag

width

compassisused,

joint

rod B (B

accessories

box)tothe

zigzag

work

can

withade

due to the

1502-391-

presser

be

Fig.

22

Joint

rob

B

(

2)

Cord

attachment

The embroidering type by which the drawn design is sewn by attaching

the cord or yarn is called the cord attaching embroidering or embroidering

with cord attachment. (Fig. 25, 26)

Fig. 23 How to use

- 15 -

the

compass

To do this type of embroidering^, use the attachment shown in Fig. 24.

In this case, too, attacii tiie joint rod B to the presser i)ar and attach tliis

attachment

Fig. 24 How to use the cord attachment

.rS,^s,U

Exampleofcord

embroidery

\r.T'%

attachment

work

(A)

cvv

!')

/

—16—

. . -

Fig.

26

Exampleofcord
embroidery

work

attachment

(B)

Ill

1. Timing and adjustment of needle throw

As

showninFig.

the

needle

throw

not

same,

the

not

ended

even

will

tear the

To

move

the

slightly,

set

the

cloth

obtain

arm

andasyou

timing.

ADJUSTMENTOFSTITCHING

27,

when

the

heightofthe

at the start of the

needle

correct

cover,

After

might

though

the

and attractive

timing

loosen

watch

the

adjusting,besuretotighten

needleispiercing

the

throw

"skip"

because

sewn

product

and

adjustmentofneedle

set

screwofthe

needle

stitching,

right

and

and

at the

endofthe

the

needle

throw

the

cloth.

cannotbeobtained.

main

rotate

the

the

set

left

movement

Thus,

the

throwing,

shaft

gear

gear

slightly

screw

firmly.

motion

throw

needle

first

screw

of

is

is

re

and

Needle

Start

of

needle

throw

Cloth

Throat

2. Adjusting

The correct stitching of the

evenlytothe

it

completes

i.i

^L' End of needle

y/*

throw

the

correct

hole

of^the

the

throwing

Start

of

needle

throw

position of

throat

motion.

Fig.

needle

plate,

(See

—17—

Needle

\||!

End

I

needle

>

throw

Throat

2/

the

throw is when the

not

too

© Fig.

Start

of

throi

Cloth

N.

plate

needle throw

much

28)

needle

to the

Needle-

of

needle

rightorleft,

[jj,End

si 1needle

'•1!

*throw

stitches

as

of

Needle hole of the

throat

plate

Needle

To

obtain

this

correct

loosen

the set

spanner, rotate the flat part of the bushing which came outside and throw

the

needle

screw

of the

to right or left as

it at 0 and by inserting a

stitching

throwing
cover

set at the factory.

at the 0 position, remove the face plate, loosen the eccentric shaft set screw

and as

the correct needle stitching position.

position

position.

up the arm

If the

needle

you

by

cover.

does

rotate the

After the

eccentric

(A)

needle

zigzag

piece

watching

The correct

not

stitch

stitching

(B)

Fig.

throwing

adjusting

you

rotate the hand

25

Needle

(B)

position,

shaft

stitching

remove

bushing,

wheel.

the arm

and

withalarge

Also,

by setting

of paper and confirming the correct needle

the

holes

in the paper, adjust the needle

adjustment,

into the

shaft

firmly

position

of the

center

(Fig.30(D)

tighten

the set

needle

of the throat

withascrew

screw

throwisalready

plate

driver,

cover,

and

groove

adjust

Fig,

29

—

18

—

Fig.

30

3.

Timinfif

If the

the

sewing hook with

timing

of the

sewing

hook

the

needle

and

the

needleisnot

correct,

skip-

stitching or thread breakage may result.

To obtain this correct timing, first, rotate the hand wheel towards the

operator,

with

bring

the red

the red carved line of the

point

of the

machine

hand

head.

wheel forward

(Fig.

31)

(At this

and

match it

position,

the

needle will be at the raised position of 2.0mm (5/64") from the

lowest

posstion).

sewing hook

Next, slightly

and

match the tip of

loosen

the 3 screws which are clamping the

the

hook with the center of the needle.

The clearance between the needle and the tip of the sewing hook

should be as close as possible as long as the hook does not contact the

needle

height of the needle bar, push

becomes

(O^O.OSmm)

and tighten the screws. (Fig. 32) To determine the

the

knee lifter so

that

the width of throw

greatest. Rotate the hand wheel to make the needle drop to left

side and rotate the hand wheel further until the left throwing needle and

the tip of the sewing hook meet each other and stop the hand wheel.

At this position,
sewing hook comes to
ing needle. (Fig. 33)

If the needle bar moving shaft set screw is loosened, the needle bar

will move up or down, so

ing

the

needle

slightly above the needle eye.

bar is lowered too much, it will hit

break

andifit's

Be

extremely

careful.

set

the

barupand

raised too

the

heightofthe

upper

set

the

down so

Then

high,

needle

barsothat

partofthe

heightofthe

that

firmly tighten the screw. If

the

skip-stitching may result at

needle eye of

needle

the

tip of

the

bobbin case and

bar

sewing hook comes

the

tip of

the

left

throw

by gently mov

the

needle

the

needle might

the

left side.

the

—

19

—

1

1.5mm

2

2.5mm
3

3.5mm

4

4.5mm

5

5.5mm

6

6.5mm
7

7.5mm

8

8.5mm

9

9.5mm
10
11

12
13

14

15
16

17

18
19

20

Milli

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm
mm

mm
mm

mm

mm

mm

mm

mm

mm

mm

CONVERSION

MetertoInch

5/128"
1/16"

less

1/16"

plus

3/32"

plus

1/8"

less

1/8"

plus

5/32"

5/32"

plus

3/16"

plus

7/32"

less

1/4"

less

1/4"

plus

1/4"

plus

9/32"

plus

5/16"

5/16"

plus

3/8"

less

3/8"

less

3/8"

plus

7/16"

less

15/32"

33/64"

35/64"
9/16"
5/8"

43/64"

11/16"

3/4"
25/32"

plus

less

plus
plus

plus

less

plus

plus

1/256"

1/64"

1/256"
1/128"

3/256"

5/256"

1/128"

1/256"

1/64"

1/256"
3/128"
3/256"

5/256"
3/128"

1/256"

1/64"

1/128"

1/256"

1/256"

3/640"
3/128"

3/640"

1/256"

1/64"

3/128"

TABLE

inchtoMilli

1"

1/2"

1/4"

3/4"

1/8"

3/8"

5/8"

7/8"

1/16"

3/16"
5/16"

7/16"

9/16"

11/16"

13/16"

15/16"

1/32"
1/64"

1/128"

Meter

25.4

12.7

6.35

19.05

3.175

9.525

15.875mm

22.225mm

1.5785mm

4.7625mm

7.9375mm

11.1125mm

14.2875mm

17.4625mm

20.6375mm

23.8125mm

0.79375mm

0

396875mm

0.19844mm

mm

mm

mm

mm

mm

mm

TOKYO

Head Office & Plant, 2-1, 8-chome, Kokuryo-cho, Chofu-shi,
Business Office: 23, Kabuki-cho, Shinjuku-ku,

Cable

Address:

JUKI

JUKI

TOKYO

INOUSTRIAL

22967

Tokyo.

JUKITK

Telex:

GO.,LTD.

Japan

Tokyo,

Japan

IP^an(T)

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