Adjusting The Overlapping Amount Of The Upper Thread Scissors And The Work Clamp - Brother HE-800B Service Manual

7. ADJUSTMENT

7-12-9. Adjusting the overlapping amount of the upper thread scissors and the work clamp

1. Turn on the power, move the feed mechanism to the home position, and then press the THREAD key to lower the work
clamp and move the roller of the trimmer driving arm to the home position.
2. With the power turned off, move the feed arm forward by hand until the upper thread scissors begin to open, and then return
the feed arm to its position before it was moved.
3. Loosen the two screws (3) and move the adjusting plate (4) to set the distance A in the illustration so that the overlapping
amount B between the tip of the scissors D assembly (1) and the work clamp (2) is 1.0 mm to 1.5 mm. Then tighten the two
screws (3).
4. Next, with the power turned off, mote the trimmer driving arm forward by hand as far as it will go.
5. Once again loosen the two screws (3) and move the adjusting plate (4) to set the distance C in the illustration so that the
overlapping amount B between the tip of the scissors D assembly (1) and the work clamp (2) is 1.0 mm to 1.5 mm. Then
tighten the two screws (3).
* Make sure that the position (distance A) which was set in steps 1 and 2 does not change at this time.
6. Turn on the power, depress the treadle to move the feed mechanism to the home position, and then switch to test mode and
check that the scissors D assembly (1) is always overlapping the work clamp (2).
103
Roller position Roller position
at step 4 at step 2
HE-800B
0751D