Brother HE-800A Service Manual page 25

4066Q
5. The lower thread trimmer cam connecting rod (10) is connected to lower thread trimmer link A (11), so that the
movement of the lower thread trimmer cam connecting rod (10) is transmitted via lower thread trimmer link A
(11) and the lower thread trimmer connecting rod (12) to the knife driving lever (13).
6. The collar (15) that is installed to the lever (14) is linked to the cam groove in the knife driving lever (13), so that
when the knife driving lever (13) operates, the lever (14) rotates centering on the screw (16).
7. The lower thread retainer (17) is secured to the lever (14), so the lower thread retainer (17) starts to operate.
8. When the lower thread retainer (17) operates, the collar (19) that is installed to the lower thread clamp plate
(18) moves over the ridge line of the cam of the lower thread retainer (17), and the lower thread clamp plate
(18) starts to close and engages with the lower thread presser (20) so that the lower thread is clamped.
9. The lower thread retainer (17) then continues operating.
10.The fixed knife (21) is secured to the knife driving lever (13), so that when the knife driving lever (13) operates,
the cam section of the movable knife (22) that is secured to the fixed knife (21) moves over the cam section of
the base plate (23) so that the movable knife (22) starts to close. When the lower thread retainer (17) has
finished operating, the movable knife (22) meshes fully with the fixed knife (21) and cuts the lower thread.
HE-800A
1. MECHANICAL DESCRIPTIONS
4067Q
17