Brother b831 User Manual

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Brother b831 Specifications

General

Brand	Brother
Model	b831
Category	Sewing Machine
Language	English

Summary

Sewing Machine Mechanisms

Upper Shaft and Needle Bar Mechanism

Needle Feed Mechanism

Lower Shaft and Rotary Hook Mechanism

Feed Mechanism

Thread Trimmer Mechanism

Details the operation of the thread trimming mechanism.

Reverse Mechanism

Disassembly Procedures

Rotary Hook, Lower Shaft and Thread Trimmer Mechanism

Assembly Procedures

Lower Shaft, Thread Trimmer and Rotary Hook Mechanism

Feed Assembly

Needle Bar Frame and Feed Dog Position Adjustment

Standard Adjustments

Needle and Feed Timing

Adjusting the timing between the needle and feed mechanisms.

Needle and Rotary Hook Timing Adjustment

Adjusting the timing between the needle and rotary hook.

Rotary Hook to Needle Plate Gap

Setting clearance between rotary hook and needle plate.

Presser Foot Height Adjustment

Adjusting the height of the presser foot.

Feed Dog Height Adjustment

Adjusting the height of the feed dog.

Stitch Length Adjustment

Adjusting stitch length for forward and reverse feed.

Movable and Fixed Knife Adjustment

Adjusting the movable and fixed knives for thread cutting.

Troubleshooting Guide

Thread Breaks

Common causes and remedies for thread breakage issues.

Loose Threads

Excessive Puckering

Causes and remedies for fabric puckering during sewing.

Stitches Skip

Addressing skipped stitches during sewing.

Needle Breaks

Troubleshooting for needle breakage issues.