Thread Trimmer Arm - Brother RH-981A Service Manual

4-22-2. Adjusting the position of the thread trimmer arm
The rocking stroke of the thread trimmer arm is fixed to the drive cylinders.
Match mark
Align the tip of the fixed knife
with the match mark.
1. Turn the thread trimmer link lever (1) in the direction of the arrow until it touches the stopper screw (2).
2. Loosen the bolt (3), adjust the position of the thread trimmer arm (4), and determine the engagement between the
movable knife (5) and the fixed knife (6). The above figure shows standard adjustment.
Note: When tightening the bolt (3), make sure that the thread trimmer lever arm (7) and the thread trimmer arm
(4) can move smoothly without any end play.
Too little engagement may cause the lower thread not to be hooked, leading to thread cast-off at the start
of sewing.
RH-981A
4. ADJUSTMENT
3805Q
64