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Mitsubishi Electric LY2-3750-B1T User Manual

Mitsubishi Electric LY2-3750-B1T
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A180E301P02
INSTRUCTION MANUAL
SINGLE-NEEDLE LOCKSTITCH UPPER AND LOWER FEED
AUTOMATIC UNDERTRIMMER
INDUSTRIAL SEWING MACHINE
LY2-3750-B1T
MODEL
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Mitsubishi Electric LY2-3750-B1T Specifications

General IconGeneral
BrandMitsubishi Electric
ModelLY2-3750-B1T
CategorySewing Machine
LanguageEnglish

Summary

Introduction

Safety Precautions

Essential safety guidelines to prevent injury during machine operation and maintenance.

Precaution before Starting Operation

Crucial checks and precautions to take before powering on and operating the sewing machine.

Precaution for Operating Conditions

Guidelines on environmental conditions to avoid for optimal machine performance and longevity.

Preparation for Operation

Adjustment of the needle stopping position

Procedure for setting the needle's 'up' and 'down' positions accurately for sewing operations.

Usage Precaution

Installation of the knee lifter

Steps for correctly installing the knee lifter mechanism to operate the presser foot.

Lubrication

Instructions for filling the oil reservoir and maintaining proper lubrication levels for the machine.

Lubrication condition

How to check the oil sight window to ensure correct lubrication is occurring within the machine.

Adjustment of lubrication to the rotating hook

Method for adjusting the amount of oil supplied to the rotating hook for optimal performance.

Adjustment of lubrication to the upper shaft

Procedure for adjusting the oil flow to the upper shaft using a dedicated adjusting screw.

Adjustment of the oil pump

Guidance on adjusting the oil pump's bypass hole to control oil splashing.

Periodical cleaning

Routine cleaning procedures for the machine, motor, and control box to prevent malfunctions.

Precaution for the built-in type detector

Specific care instructions for the optical type detecting element to prevent damage or errors.

Installation of the belt cover

Instructions for safely installing the belt cover on both the machine and motor sides.

Precaution on operation

Critical operational precautions, including foot placement, power interruption, and control box care.

How to Use

Installation of the needle

Step-by-step guide for correctly installing the sewing machine needle, including orientation.

Winding of the bobbin thread

Instructions for winding bobbin thread, including tension and amount adjustments.

Threading of the needle thread

Detailed procedure for threading the needle thread through the machine's components.

Adjustment of feed (stitch) length and backstitch

How to adjust stitch length and engage the backstitch function using the designated controls.

Balance of threads tension

Visual guide and explanation for achieving balanced needle and bobbin thread tension.

Adjustment of the needle thread tension

Method for adjusting the needle thread tension based on the bobbin thread tension.

Adjustment of the bobbin thread tension

Instructions for adjusting the bobbin thread tension using the designated screw.

Adjustment of the presser foot pressure

How to adjust the pressure of both the presser foot and feed foot for different fabrics.

Adjustment of the feed dog height

Procedure for adjusting the height of the feed dog for optimal fabric feeding.

Adjustment of the feed dog inclination

How to adjust the horizontal inclination of the feed dog based on sewing material.

Adjustment of forward/backward stitch length

Method for adjusting stitch length for both forward and backward sewing directions.

Manual Presser bar lifter

Operation of the manual lever to raise or lower the presser foot.

Adjustment of the feed foot and the presser foot

Adjusting alternating movement of feed foot and presser foot, and their balance.

Installing the feed regulator bracket

Steps for correctly installing or remounting the feed regulator bracket and related parts.

Feed pitch adjustment of feed foot

How to adjust the feed pitch of the feed foot by changing its position.

Adjustment of the feed timing

Procedure for adjusting the timing of the eccentric feed cam and lifting cam.

Adjustment of the thread trimmer device

Overview and precautions for adjusting the automatic thread trimmer mechanism.

Relationship between the fixed knife and the movable knife (left) edge

Adjusting the gap between the fixed and movable knives for proper thread cutting.

Knife driving shaft

Standard positioning and assembly of the knife driving shaft and its components.

Installing the thread trimmer solenoid unit

Instructions for mounting the thread trimmer solenoid unit and setting clearances.

Installing the thread trimmer cam

Procedure for setting the thread trimmer cam timing relative to the pulley and roller.

Adjustment of knives engagement

Adjusting the engagement amount and pressure between the movable and fixed knives.

Adjustment of the needle thread tension release

Adjusting the needle thread tension release mechanism for the thread trimmer.

Adjustment of the needle thread remaining length

How to adjust the length of the thread remaining after trimming.

The rotating hook, bobbin case, and bobbin

Using the correct rotating hook, bobbin case, and bobbin for thread trimmer equipped machines.

Adjustment of the gap between the pulley and the machine head

Setting the correct gap between the pulley and machine head for the detector.

Specifications

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