Brother LH4-B800E Service Manual download pdf (Page 9)

LH4-B800E

1 - 2

1. MECHANISM DESCRIPTION

1-2. Upper shaft, lower shaft and rotary hook mechanism

1. When the machine pulley q is turned in the direction of the arrow, the rotation is transmitted to timing pulley U e

that is secured to the upper shaft w.

2. The timing belt r is attached to timing pulley U e, and it accurately transmits the rotation of the upper shaft to the

timing pulley t.

3. The timing pulley t is secured to the lower shaft y, and it transmits the rotation to the rotary hook joint u that is

secured to the end of the lower shaft y.

4. The rotary hook i is secured to the rotary hook joint u and rotates fully together with the rotary hook joint u.

Direction of

rotation

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Brother LH4-B800E Service Manual Page 9