Brother STAR 120E Service Manual download pdf (Page 21)

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2. ADJUSTMENT OF THE TIMING BETWEEN THE UPPER AND LOWER

SHAFTS

STANDARD

When the mark on the horizontal feed cam of the upper shaft is horizontal, the mark on the thread cutter cam

of the lower shaft should be 5

° above horizontal. (Turn the pulley counterclockwise.)

ADJUSTMENT

1. Remove the timing belt from the horizontal feed cam, the tension pulley and timing pulley D.

2. Position the mark on the horizontal feed cam so that it is horizontal and the mark on the thread cutter

cam so that it is 5

° above horizontal.

3. Install the timing belt onto the horizontal feed cam, the tension pulley and timing pulley D.

(At this time, the mark on the outer rotary hook should be in the center facing forward.)

Upper shaft assembly

(horizontal feed cam pulley)

Mark

When the mark on the horizontal feed

cam is horizontal, the mark on the

thread cutter cam should be 5° above

horizontal.

Lower shaft assembly

(thread cutter cam)

Mark

5°

Outer rotary hook

Mark

Horizontal feed cam

Timing belt

Tension pulley

Timing pulley D

Thread cutter cam

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Brother STAR 120E Service Manual Page 21