UPPER & LOWER LOOPERS TIMING
When lower looper (F) moves to the right, the tip of upper looper (G) meets the lower
looper (F) within 1mm (5/128”) from the left of lower looper eye (H) as shown in ***
A ***.
TO ADJUST
1.
Before proceeding this adjustment, check the lower looper timing (Refer to page 22)
and the position of upper looper (Refer to page 23).
2.
Remove the machine base (Refer to page 7), needle plate and presser foot.
3.
Loosen the 2 set screws (I), and adjust the timing by turning the upper looper drive
cam (J) to the direction of:
*
D if the timing of upper looper is advanced as shown in *** B ***.
* E if the timing of upper looper is delayed as shown in ***
C ***.
The allowance is 1 mm (5/128”) from the left edge of lower looper eye (H) as shown
in *** A ***
4.
Tighten the 2 set screws (I).
5.
Check the clearance between the loopers. (Refer to page 25.)
6.
Attach the machine base (Refer to page 25.), needle plate and presser foot.
Note:
Adjustment would be easier if the marking-off line (K) on the upper looper
drive cam (L) is set in line with the marking-off line (N) of the drive shaft (M).
Note:
the upper looper drive cam (L) must not be moved to left or right.
25
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