4-23.Adjusting The Lower Thread Trimmer (-02, -52 Specifications); Adjusting The Knife Engagement - Brother RH-981A Service Manual

4. ADJUSTMENT
4-23. Adjusting the lower thread trimmer (-02, -52 specifications)
[Adjusting the thread trimmer which can cut the lower thread and gimp, leaving them shorter]
The thread trimmer operates by means of an air cylinder when the feed bracket is at the home position.

4-23-1. Adjusting the knife engagement

Movable knives L (1) and R (2) should overlap each other by approx. 1 mm.
3813Q
1. Loosen the screw (3).
2. With springs L (4) and R (5) attached to movable knives L (1) and R (2), align the end of thread trimmer link lever
J assembly (6) with the match mark on the rear of the link fulcrum plate assembly (7), and tighten the screw (3).
Note: Make sure that the movable knife driving cam (8) and thread trimmer lever arm B (9) rotate smoothly without
any gap.
3. Move thread trimmer link lever J assembly (6) to check engagement between movable knives L (1) and R (2).
4. If the engagement is insufficient, return to step 2 to perform fine adjustment so that the end of thread trimmer link
lever J assembly (6) overlaps with the match mark on the rear of the link fulcrum plate assembly (7).
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RH-981A
3814Q
3815Q