Desmontagem Sistema Inferior - Curso Especialização técnica - Manutenção Máquinas de Costura Brother

Maintenance and Lubrication of Sewing Machines

Initial Maintenance Steps

• The maintenance process begins with removing the needle plate for cleaning.

• The stop from the bobbin case is removed, along with a spring that is part of the mechanism.

Disassembling Key Components

• The shuttle is detached using a 2mm Allen key screw.

• Important lubrication points include the shuttle and its axis, which require grease to function properly. Neglecting this can lead to machine malfunctions such as incorrect stitching patterns.

Common Issues and Misdiagnoses

• Many technicians misdiagnose issues as motor or main board failures when they are actually due to lack of lubrication in critical components.

• The lower part of the shuttle contains two washers: one thick and one thin. Regular replacement of these parts is crucial for maintaining machine performance.

Cleaning Procedures

• In embroidery machines, it’s essential to replace worn washers; in sewing machines, evaluation determines if replacement is necessary based on wear marks.

• Removing the shuttle support involves unscrewing four screws located underneath it.

Detailed Cleaning Techniques

• After disassembly, thorough cleaning is performed on various components where oil residue accumulates, potentially causing operational issues.

• A bipartite cord is used for cleaning intricate areas within the machine to ensure all residues are removed before applying new grease.

Final Steps in Maintenance

• Even if not heavily soiled, regular cleaning helps prevent contamination of new grease applied later.

• Attention should be given to any signs of wear on components like spacers or bronze washers during maintenance checks.

• Lubrication procedures involve careful handling of bushings without needing complete removal unless absolutely necessary.