20
TO ADJUST THE POSITION OF
THE UPPER LOOPER
Correct setting:
When the upper looper is at the leftmost position, the distance between the center of needle and the center
of looper eye should be 4.8 mm to 8.2 mm
To adjust:
1: Remove the machine base.
2: Make sure that the marking-off line on the upper looper drive cam is in line with the one on the main
shaft.
3: Loosen the hexagonal bolt, and adjust the distance between upper looper shaft guide and
bottom of upper looper.
The distance should be 1.6 mm to 1.8 mm when the upper looper
is at the lowest position as shown in Fig. 1.
4: Tighten the hexagonal bolt, be careful not to tighten too much, otherwise the upper looper driving arm
will be cracked.
5: Turn the handwheel and bring the upper looper to the leftmost position.
6: Loosen the hexagonal socket screw, and adjust the distance between the center of needle and center
of upper looper eye as shown in Fig. 2 and Fig. 3.
7: Tighten the hexagonal socket screw.
8: Check the upper and lower loopers timing and clearance between upper and lower loopers.
