JUKI LH-1152-5 User Manual

BE003600B0B
U MODEL LH-1152-5
2-ISIEEDLE, NEEDLE FEED LOCKSTITCHER
WITH AUTOMATIC THREAD TRIMMER
Before operating your JUKI Lockstitch Machine,
please reaid this Instruction Book carefully in order
to operate it in thecorrectandefficient manners.
Instruction Book
BEFORE OPERATION
1. Don't run the machine before filling the oil .'reservoir
with the prescribed lubrioatirtgoil.
2. After setting up your machine, make sure that it runs
in the correct direction; lower the needle by turning
the handwheel and watch the handwheel's revolution by
momentarily switching the power "on" (correct rotational
direction of the handwheel: counterclockwise when
viewed from the handwheel's end).
3. Run the newly installed machine at a speed of 4,000
s.p.m. or lower for the first 4 weeks.
4. Don't hold the machine by its synchronizer behind the
handwheel 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.).
SPECIFICATIONS
Stitch specification
CAUTIONS IN OPERATION
1. Don't put your hand under the needle when you turn the
main switch "on" or operate the machine.
2. Don't put your fingers into the thread take-up cover.
3. Don't forget to turn the main switch "off" before you tilt
the machine head back or remove the V-belt.
4. Never bring your fingers or hair close to, or place anything
on the handwheel, V-belt, bobbin winder wheel or motor
during operation. It may lead to serious personal injuries.
5. If your machine is provided witha belt cover, finger guard
and eye guard, never operate your machine with any of
them removed.
Fabrics
Sewing speed
General fabric medium-weight
Gtemical shoes
Stitch length (max.)
Needle gauge
Presser foot lift
Lubricating oil
See "34. Table of sewing speed for needle gauges" (p.8)
4 mm (5/32").
6 mm (15/64")
4 mm (5/32")
Sgxl906 #9~#U DPX5 #11-#22
DP X 5 #18 - #22
3/32" ~ 1-1/4"
(2.4 mm ~ 31.8 mm)
3/16" -1-1/4"
1/8" - 1-1/4"
(3.2-31.8 mm)
(1/8" on special request)
(i/8" on special request) | (4.8 mm — 31.8 mm) [
6 mm (15/64") by hand lifter. 10 mm (25/64") by knee lifter
JUKI New Defrix Oil No. 2 (Oil for Overedger)
3/32" - 1/4"
(2.4 mm - 6.4 mm)
1. INSTALLATION
From the library of: Superior Sewing Machine & Supply LLC

JUKI LH-1152-5 Specifications

General

Brand	JUKI
Model	LH-1152-5
Category	Sewing Machine
Language	English

Summary

Before Operation

Cautions During Operation

Hand Safety

Keep hands away from the needle area while operating or turning the main switch on.

Finger Safety

Do not put fingers into the thread take-up cover.

Power Switch Protocol

Always turn the main switch off before tilting the head or removing the V-belt.

Proximity Hazards

Keep fingers, hair, and objects away from moving parts like the handwheel and V-belt.

Guard Safety

Never operate the machine with safety guards removed.

Lubrication

Threading the Machine

Standard Threading

Thread the machine as illustrated for the left and right needles.

Pedal Operation

Four-Stage Pedal Control

Operate pedal lightly forward for low-speed, further for high-speed, back to stop, and backward for trimming.

Thread Tension

Needle Thread Tension Adjustment

Turn tension nut clockwise to increase or counterclockwise to reduce needle thread tension.

Bobbin Thread Tension Adjustment

Turn tension adjusting screw clockwise to increase or counterclockwise to reduce bobbin thread tension.

Presser Foot Pressure Adjustment

Pressure Adjustment

Loosen nut, turn regulator to adjust pressure, then tighten nut.

Timing to Release Thread Tensions

Tension Release Link Adjustment

Adjust height of thread tension release link to release thread.

Needle-to-Hook Relation

Moving Knife Adjustment

Initial Knife Position

Set stitch dial to "0", align needle with feed dog, adjust moving knife.

Moving Knife Height

Align feed dog edge with fixed knife, adjust moving knife height.

Rocker Arm Adjustment

Adjust rocker arm clamp screw and cam follower for moving knife contact.

Clamp Spring Pressure Adjustment

Spring Pressure Setting

Loosen screw, lightly touch adjusting screw to metal fitting, then tighten screw.

Reverse Feed Switch Lever

Switch Lever Operation

Depress lever to run machine in reverse; release for forward sewing.

Reverse Feed Solenoid Position

Set stitch dial to max, adjust solenoid bracket for 0.5-1.0 mm clearance.

CPU Box Switches

CPU Box Switch Operation

Turn CPU box switches ON/OFF to adjust settings, e.g., DIP switch 2 ON for timing.

PSC Box Switches

PSC Box Switch Operation

Turn DIP switch 21 ON in PSC box to reduce motor clutch noise for heavy-weight material.

Pedal Pressure and Stroke

Troubleshooting

Thread Breakage Causes

Identifies causes like sharp edges, high tension, or hook blade issues.

Stitch Skipping Causes

Identifies causes like low tension, tight spring, or wrong needle-to-hook relation.

Loose Stitch Causes

Identifies causes like bobbin thread path, rough surface, or low bobbin tension.

Thread Escape After Trimming

Identifies causes like high tension, early trimming action, or caught thread.

Thread Escape at Start

Identifies causes like high tension, low clamp spring pressure, or wrong position.

Sharp Thread Cutting Issues

Thread Not Cut At All

Needle Thread on Wrong Side

Automatic Presser Foot Lifter

Presser Foot Lifter Stroke Adjustment