JUKI LS-1341 User Manual

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1. SPECIFICATIONS
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Item
Model
Model name
Application
Sewing speed
Needle
Thread possible to be
sewn
Thread possible to be
trimmed
Stitch length
Presser foot lift
Stitch length adjusting
mechanism
Reverse stitch adjusting
method
Thread take-up
Needle bar stroke
Alternate foot stroke
Hook
Feed mechanism
Top and bottom feed
actuation mechanism
Thread trimming
mechanism
Lubrication
Lubricating oil
Cylinder bed diameter
Free space for sewing
Size of handwheel
Motor
Specifications
LS-1341
LS-1342 LS-1342-7
Cylinder-Bed, 1-
Needle, Unison
Feed, Lockstitch
Machine with
Automatic
Thread Trimmer
(Large Hook)
Cylinder-Bed, 1-Needle, Unison
Feed, Lockstitch Machine
(Large Hook)
For heavy-weight materials
Max. 2,500 rpm
#50 to #8 #40 to #5 #30 to #5
#30 to #5
Max. 6 mm (normal/reverse feed)
Hand lifter : 9 mm Knee lifter : 16 mm
By dial
Lever type
Slide thread take-up
36 mm
Ellipse feed
Timing belt
Central oil wick lubrication by tank (partially by manual)
JUKI New Defrix Oil No. 2 (equivalent to ISO VG32)
72mm
255 x 100 mm
V belt effective diameter : ø93.3 mm Outer diameter : ø160 mm
4P, 400W SC-380
SCHMETZ 135 X 17 Nm 100 to 180 Standard : Nm 160
Air cylinder type
(with touch-back
switch)
2.5 mm to 6.5 mm Slot adjusting type
1 mm to 6.5 mm Alternate foot stroke
adjusted by dial
Full-rotary vertical-
axis standard hook
(Latch type)
Full-rotary vertical-
axis 1.6-fold hook
(Cap type)
Full-rotary vertical-axis 1.6-fold hook
(Latch type)
Cam-driven
scissors type
LS-1340
Cylinder-Bed, 1-
Needle, Unison
Feed, Lockstitch
Machine
(Standard Hook)
SCHMETZ 135
X 17 Nm 100 to
180 Standard :
Nm 140

JUKI LS-1341 Specifications

General

Brand	JUKI
Model	LS-1341
Category	Sewing Machine
Language	English

Summary

Specifications

Standard Adjustment

Needle entry position

Specifies the vertical clearance between the needle and the throat plate for proper entry.

Longitudinal position of the feed dog

Details the horizontal alignment of the feed dog relative to the needle hole.

Lateral position of the feed dog

Describes the side-to-side alignment of the feed dog within the needle hole.

Height of the feed dog

Defines the vertical position of the feed dog from the throat plate.

Needle-to-hook timing

Sets the timing relationship between the needle and the hook for correct stitch formation.

Height of the hook

Specifies the vertical position of the hook relative to the needle.

Adjusting the inner hook guide

Guides adjustment of the inner hook guide's position for smooth thread passage.

Lift of the presser foot

Details adjustment for hand and knee lifters for presser foot elevation.

Feed cam timing

Covers horizontal and top feed cam adjustments for proper feed dog movement.

Feed motion

Explains adjustment of alternate vertical movement and momentum for feed dogs.

Horizontal feed arm

Adjusts the horizontal feed arm position for accurate feeding.

Stitch length of normal/reverse feed

Sets the stitch length for forward and reverse feeding.

Balancer (LS-1340 and LS-1341 only)

Balancer adjustment for specific models to reduce vibration.

Position of the reverse feed control lever

Adjusts the position of the reverse feed control lever for proper operation.

Safety clutch

Describes the function and adjustment of the safety clutch.

Standard Adjustment of Thread Trimmer Components (LS-1342-7)

Thread trimmer device

Adjusts vertical position and pressure of moving and fixed knives for thread trimming.

Alternate vertical dial

Installs the detection switch for the amount of alternate vertical movement.

Adapting SC-380 to LS-1342/1342-7

Details parameter settings for adapting the SC-380 to specific machine models.

Installation of the Optional Parts

Automatic reverse feed device (LS-1340, LS-1341, LS1342)

Procedures for removing and installing the automatic reverse feed device.

Automatic presser foot lifter

Instructions for installing the automatic presser foot lifter and pneumatic components.

DL device (LS-1342)

Details installation procedures for the DL device.

Knee lifter shaft (pedal type)

Steps for installing the knee lifter shaft and related components.

Binder kit

Procedure for installing the binder kit after machine set-up.

Portion to Which Locktite Is Applied

Selective Parts and Consumable Parts

Engraved Marker Dots on the Handwheel

Lubrication Route Diagram

Table of Troubles and Corrective Measures

With regard to sewing

Lists common sewing troubles, their causes, checking methods, and corrective actions.

With regard to thread trimming

Details troubleshooting for thread trimming issues, causes, and corrective actions.

Drawing of the Table