HE-800C
9. STANDARD ADJUSTMENTS
71
9-9. Adjusting the lower thread clamp timing
1. Gently tilt back the machine head.
2. When reference line A on feed guide shaft B (1) is
aligned with the edge of the feed arm support (2), the
opening plate (3) will start moving when the feed
mechanism moves 6-7 mm from the home position,
and the lower thread retainer (4) will open.
To change the opening timing, loosen the screw (5) of
the feed arm support (2) and move feed guide shaft B
(1) to the left or right.
3. Gently return the machine head to its original position.
9-10. Adjusting the bobbin presser
1. Press the THREAD key to switch to threading mode.
2. Gently tilt back the machine head.
3. Loosen the set screw (1), and then adjust so that the
bobbin presser (2) goes into the hole in the bobbin
case (3).
4. Check that the work clamp is at the home position, and
then loosen the nut (4) and turn the screw (5) to adjust
the clearance A between the bobbin presser (2) and
the edge of the bed to approximately 12.5 mm.
5. Gently return the machine head to its original position.
6. Press the THREAD key.
3988Q
Becomes
faster
Becomes
slower
3989Q
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