JUKI LK-1850 Series Guida rapida

UUKI

LK-1850 SERIES

High-Speed

1-Needle

Cylinder

Bed

Lockstitch

Bar

Tacking

Machines

ENGINEER'S

MANUAL

TOKYO

JOKI

INOUSTRIAL

CO.,

LTD

FOREIGN

TRADE

BUSINESS

DIV.

No.

IV-19

1983.7

From the library of: Superior Sewing Machine & Supply LLC

PREFACE

This Engineer's Manual is written

for

technical personnel

who

are responsible for

the

service and

maintenance

the

machine.

The

Instruction

Book

for

the

machine

intended

for

the

maintenance personnel and operators at

garment

factory

contains

detailed

operating

instructions.

This

manual

describes

"Standard

Adjustment",

"How

Adjust",

"Effects

Adjustment",

and

various

other

information

which

not

covered

the

Instruction

Book.

It is advisable

use

the

relevant

Instruction

Book

and

Parts Book

together

with

this Engineer's

Manual

when

carrying

out

the

maintenance

the

machine.

From the library of: Superior Sewing Machine & Supply LLC

CONTENTS

SPECIFICATIONS

2. CAUTION IN RUNNING THE MACHINE BY HAND 2

STANDARD ADJUSTMENT

FLOWCHART

STANDARD

ADJUSTMENT

(1)

Height

of the

needle

bar 3

(2) Adjustment of the feed cam 3

(3) Position of the stop-motion hook 5

(4) Stop-motion timing 5

(5) Adjustment of the changingpulley pressingplate 7

(6) Adjustment of the starting leverstopper 7

(7) Adjustment of the safety plate g

(8)

Position

of the work

clamp

foot g

(9)

Height

ofthe

work

clamp

foot

(10)

Position

ofthe

wiper

(11)

Adjustment

ofthe

tension

release

bar

(12)

Position

the

shuttle

race

spring

(13)

Adjustment

the

timing

between

the

needle

and

the

shuttle

Timing

the

needle

bar

Timing

the

shuttle

Clearance

between

the

needle

and

the

shuttle

driver

Clearance

between

the

needle

and

the

point

the

shuttle

Clearance

between

the

needle

and

the

shuttle

race

(14)

(15)

(16)

(17)

(18)

(19)

(20)

(21)

(22)

Lateral

position

the

work

clamp

foot

Adjustment

the

auxiliary knife driving

cam

Position

the

moving

knife

and

the

counter

knife

Height of

the

moving knife and

the

counter

knife

Tilt

the

counter

knife

blade

Adjustment

the

length

thread

remaining

the

needle

Adjustment

the

thread

take-up

spring

Adjustment

the

belt

tension

Adjustment

the

bobbin

winder

OTHER

PRECAUTIONS

(1)

Configuration

the

shuttle

race

ring

(2)

How

remove

the

backlash

the

shuttle

driver

shaft

(3)

How

remove

the

backlash

the

main

shaft

(4)

How

remove

the

backlash

between

the

worm

and

the

worm

gear

(5) How to remove

the

backlash of

the

feed bracket

6. DISASSEMBLING &ASSEMBLING

PROCEDURES

AND

PRECAUTIONS

11,

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Disassembling

the

shuttle

driver

shaft

Disassembling

the

main shaft

Disassembling

the

speed reducer

Disassembling

the

high speed pulley (asm)

Disassembling

the

changing pulley •

Disassembling

the

low-speed pulley

Assembling

the

pedal pressure decreasing unit

7. PARTSTO BE FIXED

WITH

LOCKTITE

8. PARTS TO BE FILLED

WITH

GREASE

EXPENDABLE

PARTS

(1)

General

ExpendableParts

(2) Expendable PartsTo Be

Replaced

Infrequently

(3) Parts

Likely

To Be Lost Or

Damaged

During

Repair

10. PARTS FOR

SUBCLASS

MACHINES

(1) Parts For

Changing

The Numberof Stitches

(2)

Special

Partsand

Devices

(3) Modifying The Standard

Machine

To Subclass

Machine

TROUBLES

AND

CORRECTIVE

MEASURES

From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATIONS

Description

Standard

Subclass

Model

LK-1850

LK-1852-5

LK-1854-10

LK-1852-20

LK-185

2-30

LK-1854-40

LK-1854-6 LK-1852-3

LK-1854-4

LK-1852-1

LK-1854-11

LK-1852-2

AppUcationLaig(>size

bartacking

Large-size

bartacking

Attaching

belt

loops

Attaching

belt

loops

Attaching

belt loops

Attaching

belt

loops Knit

goods

bartacking

Knit

goods

bartacking

Buttonhole

bartacking

Buttonhole

bartacking

Small-size

bartacking

Small-size

bartacking

Sewing

speed

(spm)

Max.

(cotton thread)

2300 2300

2300 2300 2300

2300

Normal

(synthetic thread)

1800

1800 1800

1800

Stitch diagram

'wmm

m A A A 4

"i V V V vx WWWV^ 21

A A A S

bUUUUUVAl

riVVVVVV^

kwwi

Number

stitches

Bartacking

mdth

(mm)

1.5

1.5-3

0000

1.3-3

(Standard

2.5)

1.3-3

(Standard

2.5)

1.5-3

(Standard

2.5)

1.5

- 3

(Standard

2.5)

1.5-3

(Standard

2.5)

1.5-3

(Standrd

2.5)

Bartacking length (mm)

8~I6

8-16

6.5

(Standard

14)

6.5

~ 14

(Standard

14)

13-25

(Standard

25)

18-35

(Standard

25)

4-8

(Standard

6.5)

4-8

(Standard

6.5)

4-8

(Standard

4-8

(Standard

4-8

(Standard

4-8

(Standard

Needle

DPx5

#14.

#16

DPx5

#14,#16

DPx5

#14.

#16

DPx5

#14,#16

DPx5

#14.#16

DPx5

#14.

#16

DP X5

#11

DP X5

#11

DPx5

#14.#16

DPx

#14,

#16

DPx

#14.#16

DPx

#14.#16

lift

of piesserfoot (mm)

Max.

* The following specifications are

common

both

the

standard

and

subclass

models.

NeetOe

bar

stroke

41.2

Thread take-up link-type thread take-up

Shuttle

race

Half-rotary shuttle race

(lubricatedthrough oil wick)

Adjustmentof bartacking

width & length Byfeed regulator lever(fixed by nut)

Thread trimmingsystem Threadspreader: Interlocked with main shaft,

Thread

trimmer:

Interlocked

with

lifter

Liftingsystem

One-pedal

system: Pedal

pressure

decreasing

unit (Standard)

Two-pedal

system:

Forfoot-treadle type P

(option)

Wiper

Interlocked

with

lifter

Bobbin

winder

Driven by belt

Drivingsystem

2-stage

V belt speedreducingsystem

Safety device One-pedaldouble safety device

Lubrication

Lubricating oil: Juki New Defrix Oil No. 2

System: By centralized oil wick and

greasefilling

Motor

2()0W

(single-or 3-phase)

Weight(kg)

42.5

(Cautions)

1) A

madiina

for attaching belt loops is to be installed

sideways.

Refer to the figure at right and the table drawing on the last page

of this manual for installing the pedal shaft supplied with the

machine.

2) See the

following

table for proper use of the feed plate and work

clamp

foot

according to belt loop length.

Feed plate Work

damp

foot

LK-1854-10

Part

No.

13543608

Part

No.

13544408

LK-1852-20 (Standard)

Part

No.

13543608

Part

No.

13544408

LK-1852-30

Part

No.

13545504

Part

No.

13545603

LK-l 854-40 (Standard)

Part

No.

13545504

Part

No.

13545603

LK-185440

(25 mm or more)

Part

No.

13547005

Part

No.

13547104

3) Motorpulleyand belt (Theasterisked partsare

available

on specialorders)

Edge of

table

Motor

Opening

forbelt

Starting

pedal

shaft

[ ' |

Starting

pedal

lever

J |

(Viewed

from

table

bottom)

Fig. I

Frequency Sewingspeed Motor pulley

Part

No.

Numerical

mark

High-speedV belt Low-speed V

belt

2300 spm *

13531108

(For

cotton

thread)

2300

•MTJVM005000

(50")

MTJVM004600

46"

2000 spm *

13531207

(For

cotton

thread)

2000

*MTJVM004900

(49")

1800 spm

2300 spm

13531306

1800

2300

MTJVM004800

(48")

13531405

(For

cotton

thread)

•

MTJVM004900

(49")

MTJVM004600

46"

2000 ispm *

13531504

(For

cotton

thread)

2000

•

MTJVM004800

(48")

1800

spm

13531603

1800

MTJVM004700

(47")

From the library of: Superior Sewing Machine & Supply LLC

STANDARD

ADJUSTMENT

FLOW

CHART

Adjustment

stop-motion

mechanism

Positioning the

stop-motion

hook

Adjusting

the

stop-motion

timing

Adjusting the

safety plate

Adjustment

speed reducer

Adjusting

the

chan^ng pulley

pressing

plate

Adjusting

the

starting

lever stopper

Standard Adjustment Flow Chart

Adjusting

pedal

pressure decreasing

unit

Removing the pedal

pressure

decreasing

unit

Installing the pedal

pressure decreasing

unit

Adjustment

clamp

foot lifting mechanism

Positioning the

work

clamp

foot

Adjusting the height

the

work

clamp

foot

Adjustment

bartacking functions

Adjusting the lower deat

point

the

needle

bar

Adjusting the feed cam

Adjusting the

shuttle

race

spring

Adjusting

the

needle

and

shuttle

driver

Adjusting the right

and left work clamp

feet

Adjusting

the

auxiliary

knife driving cam

Adjusting the moving

and

counter

knives

Adjusting the

length

of thread remaining

the

needle

Adjusting

the

tension

of the thread take-up

spring

(Note)

The

solid

lines

with

arrows

( , ,

and the broken lines with arrows ( -•) represent the need for

readjustment

when

independent

adjustment

has

been

made.

) show

standard

adjustment flow.

Adjusting the

bartack

ing width and length

Other

adjustments

Positioning

the

wiper

Adjusting

the

teiuion

release

bar

Adjusting the belt

tension

Adjusting the bobbin

thread

winder

From the library of: Superior Sewing Machine & Supply LLC

STANDARD

ADJUSTMENT

Standard

Adjustment

(1) Height

the

needle bar

The upper marker line engraved on the needle bar should be flush with the bottom end of the lower

needle bar bushing when the needle bar is at the lowest point of its stroke.

(Note) Perform this

adjustment

first

before

making

any

other

adjustment.

Needle

bar

Needle

bar

bushing

(lower)

Upper

marker

line

Fig. 3

(2)

Adjustment

the

feed cam

Adjustment should be made so

that

the

feed is completed when the needle point

is 7 to 10 mm

(9/32"

25/64")

above

the

throat

plate surface.

(It is advisable to make this adjustment

during lateral feed). ^ ~ 10%

(9/32"

25/64")

-3-

&>—

Fig. 4

Fig. 5

From the library of: Superior Sewing Machine & Supply LLC

How

Adjust

1) Turn the drivingpulley by hand until the needle bar reaches the

lowest point of its stroke.

2) Remove the rubber plug from the face plate.

Loosen

setscrew

(T),and

move

the

needle

barup or

down

make the adjustment.

After

adjustment,

securely

tighten

setscrew

(T)

Loosen

nut

(T)

andthencam

guide

pin .

This

will

allow

feed

cam (3) to be movedin the direction of rotation for adjustment.

• When the feed cam is turned in direction A, the feed timing

advances.

• When the feed cam is

turned

in direction B, the feed timing is

delayed.

Fig.

(Caution)

Perform this adjustment first after

the

adjustment of

the

height of

the

needle bar. Make sure

readjust

stop-motion

regulating cam

whenever

the

feed

cam

has

been

adjusted.

-4-

Effects

Adjustment

• Improper adjustment willcause

stitch skipping or thread breakage.

Whenit is adjusted to 7 mm

(9/32")

or so, well-tensed

stitches

will

result.

Whenit is adjusted to 10 mm

(25/64") or so, protrusion of

the

first

stitch

needle

thread

onto

the

material

surface

will

be prevented when sewing

with

asynthetic thread.

From the library of: Superior Sewing Machine & Supply LLC

Standard

Adjustment

(Note)

Strictly follow

the

order

adjustment

for (3) through (6) shown below.

(3) Position

the

stop-motion

hook

Perfonn adjustment so that a 3 mm (1/8") clearance is provided between the stop-motion hook and the

stop-motion cam when the machine runs at a low speed.

Fig, 7

Stop-motion

regulating

cam

Stop-motion

regulating

cam

roller

Knife

driving

cam

0.7

~ 1. 2 %

Stop-motion

hook

'Wl

Thread

trimmer

returning

roller

Driving

plate

3/64")

Stop-motion

cam

,Knife driving

cam

roller

0-0.

(1/64")

Fig. 9

Fig. 8

(4) Stop-motion timing

Performadjustment to make the stop-motion regulating cam roller drop from the low-speed point of the

stop-motion regulatingcam onto the stop motion point at the moment the top surfaceof the stop-motion

hook

aligns

withthecenterof the

screw

No.

1on the

stop-motion

cam

at thelaststitchas

shown

Fig.

12.

Screw

No.

Stop-motion hook Stop-motion cam

Fig. 12

-5

Stop-motion

regulating

cam

roller

Stop-motion

regulating

cam

Fig. 13

From the library of: Superior Sewing Machine & Supply LLC

How

Adjust

Turn

the

main

shaftbyhandto obtainthestate

shown

Fig.

(low-speed running)

Remove

the

spring

(2)

and

spring

(D .

Loosen

screw

(T),

and

perform

adjustment

allow

(1/8")

clearance

between

thestop-motion hookandthe

knife

driving

cam.

(Caution)

When

tightening

screw

(l),

careful

not to

cause

excessive

axial

sticking.

Fig. 10 Fig. 11

Loosen

three

setscrews

(D,

and

make

adjustment

within

the

slot.

-6

Effects

Adjustment

If the clearanceis adjusted to

3 mm (1/8") or less;

neutral

state

will

result

when

the machine runs at low speed,

causing the machine to idle and

stop.

Further,

the clearance

0.7 to 1.2 mm (45/64") ~

(3/64")

between the knife

drivingcam and the knife driving

cam roller willgo at the time of

low-speedmachine running with

resultant striking noises. Also the

stop-motion

cam

will interfere

with the stop-motion

hook

at the

time of stop motion. (Fig. 8)

If the clearanceis adjusted to

3 mm

(1/8")

or more;

The pressure of spring will

become too high when the machine

mns at high speed, often causing

the machine to idle and stop. It

may alsolead to inadequate torque

at the start of high-speedrunning

with consequent reduction in

sewing speed.

Also,the thread trimmer returning

roller

will

interfere

with

the

driv

ing plate, resulting in thread

trimming failure, (clearance : 0

to 0.5 mm

(1/64"))

(Fig. 9)

• If later than screw No. 1;

The brake will

not

work,

and

therefore a great stop-motion

shock

will

result.

Also, it may cause

the

machine

to stop at the first starting stitch.

• If earlier than screw No. 1;

The brake will work excessively,

causing a

stop

motion

failure.

If the timing is extremely

too

early, the stop motion will be

engaged one stitch earlier,

producing an abnormal sound.

From the library of: Superior Sewing Machine & Supply LLC

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