14
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 base cover.
2: Loosen two set screws A, and move the balance weight to left.
3: Loosen two set screws B, and adjust the needle and upper knife timing.
*
Turn the upper knife drive cam to the direction D when the upper knife timing is being delayed.
*
Turn the upper knife drive cam to the direction E when the upper knife timing is too soon.
4: Tighten the two set screws B firmly. Move the balance weight to right.
Match the guide line on the balance weight with the one of the main shaft correctly.
Then tighten the two screws A.
:
Turn the handwheel toward you by one complete turn, and recheck the needle and the
upper knife timing.
6: Attach the feed base cover.
