13
TO ADJUST THE TIMING OF THE NEEDLE
AND THE UPPER KNIFE
Correct Setting:
The upper knife timing is the same as that of the needle bar. In fact, when the needle bar is at
highest position, the upper knife should be also at its highest position.
To adjust:
1. Remove the feed arm cover unit.
2. Loosen two setscrews A and adjust the needle and upper knife timing.
3. * Turn the upper knife drive cam to the direction B when the upper knife timing is being delayed.
* Turn the upper knife drive cam to the direction C when the upper knife timing is too soon.
4. Tighten the two setscrews A firmly.
* The cIearance between the upper knife drive cam and upper knife connecting rod shouId be 1 mm.
5. Turn the handwheel toward you one cycle, and recheck the needle and the upper knife timing.
6. Attach the free arm cover unit.
C
B
When the needle bar
goes up, the upper
knife goes up.
When the needle bar
goes down, the upper
knife also goes down.
Setscrew A