Brother LH4-B800E Service Manual download pdf (Page 23)

LH4-B800E

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1. MECHANISM DESCRIPTION

1. When the pulse motor q operates, the gear w that is installed to the pulse motor shaft engages with the presser

driving arm e so that the guide bracket r moves along the guide shaft t and moves the presser driving arm e

in the direction of the arrow.

2. The presser driving arm e causes the presser foot lifter connecting rod y to move in the direction of the arrow.

3. The presser foot lifter connecting rod y is connected to the lower thread trimmer cam lever u, so that the lower

thread trimmer cam lever u moves.

4. The roller i that is installed to the end of the lower thread trimmer cam lever u is linked to the cam groove in the

lower thread trimmer cam o, so that when the lower thread trimmer cam lever u operates, the lower thread

trimmer cam moves with it and the movement is transmitted to the lower thread trimmer cam connecting rod !0

that is connected to the lower thread trimmer cam o.

1-11. Lower thread trimmer mechanism

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Brother LH4-B800E Service Manual Page 23