HOW TO REPAIR INDUSTRIAL SEWING MACHINE

Adjusting the needle clearance

Adjusting the needle clearance

Turn the pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw (1) and turn the eccentric shaft (2) to adjust so that the clearance between the needle and the rotary hook is 0.01 – 0.08 mm.

Adjusting the shuttle race thread guide

Adjusting the shuttle race thread guide

Install the shuttle race thread guide (1) by pushing it in the direction of the arrow so that the needle groove is aligned with the center of the needle plate hole.

Note:

If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or thread entanglements may occur. The position of the shuttle race thread guide is adjusted at the time of shipment from the factory. It should not be changed if at all possible.

Rotary hook lubrication amount

Rotary hook lubrication amount

The optimum position is when the head of the set screw (1) is flush with the edge of the bed. The adjustment range for the lubrication amount is within three clockwise turns from this position.

  • If the set screw (1) is turned clockwise, the lubrication amount becomes smaller.
  • If the set screw (1) is turned counterclockwise, the lubrication amount becomes greater.
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