HIGHLEAD GC20688 Series, Instruction Manual And Parts List, Page: 17 / 62

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27) Adjusting the thread holding spring position (see the picture of above)
The thread holding spring 1 holds the lower thread after thread trimming to prepare it for the next sewing
operation. The clearance between the thread holding spring 1 and the side of the fixed knife 2 should be 1.4-1.6
mm.
(1) Loosen the two screws 3.
(2) Move the thread holding spring 1 to adjust its position, and then tighten the screws 3.
28) Adjusting the knife timing position
After adjusting the position of the fixed knife 1, adjust the knife timing position.
Adjust so that the driving knife 1 starts touching the fixed knife at a position 5.5 mm along the front edge of the
driving knife 1.
(1) Loosen the two bolts 3 and 4.
(2) Move the driving knife 1 to the left or right to adjust its position.
(3) Then tighten the bolts 3 and 4.
29) Adjusting the driving knife height
The clearance between the lower blade edge of the driving knife 1 and the lower surface of the inner rotary
hook should be 0.3-0.4mm.
(1) Loosen the two screws 2 and 5.
(2) Move the driving knife shaft 6 up or down to adjust the position of
the driving knife 1.
(6) Tighten the screws 2 and 5 on the setting collars again.
30) Adjusting the driving knife stop position
The distance from the blade of the fixed knife 2 to the end of the driving knife 1 should be 0.5 mm when
the driving knife 1 has moved as far as possible toward the fixed knife 2.
(1) Tilt back the machine head.
(2) Turn the machine pulley to move the roller 4 of the driving knife arm 3 to the outermost side (right side) of
the thread trimmer cam 5.