Brother LH4-B800E Service Manual download pdf (Page 11)

LH4-B800E

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1. MECHANISM DESCRIPTION

1-4. Presser foot lifter mechanism

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

up and down.

2. The presser driving arm e causes the presser foot lifter connecting rod y to move up and down.

3. The movement of the presser foot lifter connecting rod y is transmitted via the knee lifter lever u, upper thread

trimmer driving link i and knee lifter lever o to move the presser bar guide bracket assembly !0 up and down.

4. The feed arm !1 is secured to the presser bar guide bracket assembly !0, and it moves the presser roller bracket

!2 that is secured to the bottom edge of the feed arm !1 up and down.

5. Feed arm support !4 that is connected to the feed arm !3 is hooked onto the presser roller bracket !2, and it

moves the work clamp !5 up and down.

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Brother LH4-B800E Service Manual Page 11