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UnionSpecial 39500 MC User Manual

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FINES
T
QUALITY
STYLE
39500
MC
CATALOG
No.
®
LEWIS
COLUMBIA
CLASS
39500
INDUSTRIAL
SEWING
MACHINES
HI-STYLED
HIGH
SPEED
TWO
OR
THREE
THREAD
HEMMER
OR
SERGER
DIFFERENTIAL
FEED
MACHINES
CHICAGO
From the library of: Superior Sewing Machine & Supply LLC
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UnionSpecial 39500 MC Specifications

General IconGeneral
Class39500
Model39500 MC
Thread TensionAdjustable
Differential FeedYes
TypeOverlock
Stitch TypeOverlock
Speed6, 000 SPM
Machine Weight32 kg

Summary

Machine Identification and Oiling

Machine Style Description

Details the features of the Hi-Styled High Speed Overseaming Machine.

Machine Oiling Instructions

Guidance on oil capacity, type, and checking oil levels for the machine.

Needles and Threading Setup

Needle Specifications and Replacement

Details Union Special needles, types, sizes, and the procedure for changing them.

Thread Path Introduction

Explains the initial path of threads from cones to tension guides.

Comprehensive Threading Guide

Lower Looper Threading Procedure

Step-by-step instructions for threading the lower looper.

Upper Looper Threading (505 Stitch)

Detailed steps for threading the upper looper specifically for the 505 stitch.

Needle Threading Procedure

Step-by-step instructions for threading the needle.

Thread Tension Adjustment

Guidance on regulating thread tension using tension nuts for proper stitch formation.

Key Machine Adjustments and Settings

Presser Foot Pressure Adjustment

Guidance on maintaining adequate presser foot pressure for uniform fabric feeding.

Feed Eccentrics for Stitch Control

Explains how feed eccentrics determine stitch length and differential feed.

Needle Setting and Alignment

Instructions for aligning the needle in the needle slot and setting its height.

Component Setting and Alignment

Needle Guard Positioning

Setting rear and front needle guards to prevent interference during operation.

Looper and Spreader Alignment

Adjusting lower looper, upper looper, and spreader positions for correct stitch formation.

Feed Dog, Knife, and Looper Settings

Feed Dog and Lower Knife Adjustment

Adjusting feed dogs and the lower knife for proper fabric feeding and trimming.

Upper Looper/Spreader Clearance Check

Checking and adjusting the upper looper or spreader for adequate clearance.

Knife, Stitch, and Presser Foot Setup

Upper Knife Trim Width Setting

Setting the upper knife to achieve the desired trim width.

Stitch Length Mechanism

How stitch length is determined by the combination of feed eccentrics.

Presser Foot to Throat Plate Alignment

Aligning the presser foot with the throat plate for correct fabric feeding.

Machine Operation and Thread Control

Initial Operation Steps

Guidance on the initial steps to start operating the machine after setup.

Thread Control for Stitch Quality

Adjusting needle and looper threads for proper stitch formation and edge finish.

Advanced Adjustments and Troubleshooting

Thread Tension and Skipping Issues

Balancing thread tensions and troubleshooting skipping stitch problems.

Hemming Guide Support Bracket Installation

Instructions for assembling and adjusting the hemming guide support bracket.

Hemming Guide Finalization

Final Hemming Guide Adjustments

Final adjustments to the edge and overhanging guides for precise hemming.

Parts Identification and Listing

Style 39500 MC Parts Reference

Detailed list of parts specific to Style 39500 MC with reference numbers.

Specific Assembly Parts

Throat Plate and Guide Component List

Lists parts for throat plates, needle guards, lower knife, and hemming guide assemblies.

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