Brother LH4-B800E Service Manual download pdf (Page 24)

LH4-B800E

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1. MECHANISM DESCRIPTION

5. The lower thread trimmer cam connecting rod q is connected to lower thread trimmer link A w, so that the

movement of the lower thread trimmer cam connecting rod q is transmitted via lower thread trimmer link A w and

the lower thread trimmer connecting rod e to the knife driving lever r.

6. The collar y that is installed to the lever t is linked to the cam groove in the knife driving lever r, so that when

the knife driving lever r operates, the lever t rotates centering on the screw u.

7. The lower thread retainer i is secured to the lever t, so the lower thread retainer i starts to operate.

8. When the lower thread retainer i operates, the collar !0 that is installed to the lower thread clamp plate o moves

over the ridge line of the cam of the lower thread retainer i, and the lower thread retainer i starts to close and

engages with the lower thread presser !1 so that the lower thread is clamped.

9. The lower thread retainer i then continues operating.

10. The fixed knife !2 is secured to the knife driving lever r, so that when the knife driving lever r operates, the cam

section of the movable knife !3 that is secured to the fixed knife !2 moves over the cam section of the base plate

!4 so that the movable knife !3 starts to close. When the lower thread retainer i has finished operating, the

movable knife !3 meshes fully with the fixed knife !2 and cuts the lower thread.

i!1

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Brother LH4-B800E Service Manual Page 24