Brother LH4-B800E Service Manual download pdf (Page 101)

LH4-B800E

4 - 14

4. Adjustment

Approx. 1 mm

Aligned

4-13-3. Adjusting the lateral position of the upper thread scissors at the sewing start

1. Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the

presser foot.

2. Loosen the screw q, and then move the stopper e in and out to adjust so that the edge of the upper thread

scissors w protrudes by approximately 1 mm from the center of the cutter.

* If the amount of protrusion of the upper thread scissors w is too great, the scissors may touch the needle when

they open.

* When this adjustment is carried out, also carry out the checks and adjustments in "4-13-8. Adjusting the upper

thread scissors opening timing".

4-13-4. Adjusting the longitudinal position of the upper thread scissors

1. Turn off the power (with the feed mechanism at the home position), and then slowly move the trimmer driving arm

q forward until the upper thread trimmer assembly w is at the position shown in the illustration.

2. Loosen the screws e, and then move the upper thread trimmer assembly w back and forward to adjust so that

the front ridge line of upper thread trimmer U r is aligned with the edge of the needle hole.

* If the above adjustment is not carried out, it may result in thread trimming errors or needle breakages.

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Brother LH4-B800E Service Manual Page 101