9
5555----9 Adjusting the looper back spring
9 Adjusting the looper back spring
9 Adjusting the looper back spring
9 Adjusting the looper back spring
It is the best that the surface of the spring touches the
looper closely within the range of B.
Check to see if the surface of the spring touches the
looper closely at least on points C within the range of
B.
Spun thread #60 should be removed from the spring at
approximately 80~100g of tension.
【
6
】
ADJUSTING THE NEEDLE GUARD
This adjustment should be made when the needle is at
position 4 (see 5-2). When the point of the looper,
moving to the left, has reached the right side of the
needle, line A on the needle guard should be
0.3~0.5mm above the point of the needle (see the
illustration on the right). Then the needle must
slightly touch the needle guard. Adjustment is made
by loosening screw B.
【
7
】
ADJUSTING THE FEED DOG & STITCH LENGTH
7777----1 Feed dog height
1 Feed dog height
1 Feed dog height
1 Feed dog height
When the feed dog is at the top of its stroke, the feed
dog teeth should be 0.8~1.2mm above the top surface
of the needle plate. Adjustment is made by loosening
screws A and B.
