Lower Thread Trimmer Mechanism - Brother HE-800A Service Manual

1. MECHANICAL DESCRIPTIONS

1-11. Lower thread trimmer mechanism

1. When the pulse motor (1) operates, the gear (2) that is installed to the pulse motor shaft engages with the
presser driving arm (3) so that the guide bracket (4) moves along the guide shaft (5) and moves the presser
driving arm (3) in the direction of the arrow.
2. The presser driving arm (3) causes the presser foot lifter connecting rod (6) to move in the direction of the
arrow.
3. The presser foot lifter connecting rod (6) is connected to the lower thread trimmer cam lever (7), so that the
lower thread trimmer cam lever (7) moves.
4. The roller (8) that is installed to the end of the lower thread trimmer cam lever (7) is linked to the cam groove in
the lower thread trimmer cam (9), so that when the lower thread trimmer cam lever (7) operates, the lower
thread trimmer cam (9) moves with it and the movement is transmitted to the lower thread trimmer cam
connecting rod (10) that is connected to the lower thread trimmer cam (9).
16
HE-800A
4065Q