Seiko JW-8BL-30 User Manual

OPERATING INSTRUCTIONS
FOR
JW-8BL-20 JW-28BL-20
JW-8BL-30 JW-28BL-30
SEIKO SEWING MACHINE CO., LTD.
TOKYO JAPAN
From the library of: Superior Sewing Machine & Supply LLC

Seiko JW-8BL-30 Specifications

General

Stitch Length Adjustment	Yes
Built-in Needle Threader	No
Drop Feed	Yes
Free Arm	Yes
Max. sewing speed	800 spm
Needle bar stroke	56mm

Summary

SEIKO JW Series Model Overview

Specifications

Technical specifications for SEIKO JW series sewing machines, including speed, stitch, lift, and dimensions.

Setting Up and Initial Operation

Setting Up the Machine

Caution Before Starting Operation

Important safety warnings and initial operating procedures, including lubrication and speed recommendations.

Oiling Procedures

Guidance on where and how to apply oil to the machine for proper lubrication and maintenance.

Tension and Stitch Adjustments

Regulating Thread Tensions

How to adjust needle and bobbin thread tensions using specific nuts and screws for optimal sewing.

Stitch Length Adjustment

Presser Foot Pressure Adjustment

Mechanical Adjustments and Timing

Presser Bar and Feeder Alignment

Adjusting the relative position of presser bars and the needle hole in the feeder for correct feed.

Feed Dog Height Adjustment

Hook and Needle Timing

Setting the correct timing between the sewing hook and the needle for efficient operation.

Presser Feet Height Adjustment

Presser Feet Timing

Maintenance and Replacements

Connection Belt Replacement

Re-engaging the Safety Clutch

Steps to re-engage the safety clutch after thread jamming to prevent damage.

Hook Saddle Oiling Adjustment