TO ADJUST THE TIMING OF THE
UPPER AND LOWER LOOPERS
CORRECT SETTING:
WHEN THE LOWER LOOPER MOVES TO THE RIGHT, THE TIP OF UPPER LOOPER MEETS THE
LOWER LOOPER WITHIN 0.2 TO 1.2 MM FROM THE LEFT OF LOWER LOOPER EYE AS SHOWN IN
FIG. 1.
TO ADJUST:
1. BEFORE PROCEEDING WITH THIS ADJUSTMENT, CHECKTHE LOWER LOOPER TIMING AND
POSITION OF UPPER LOOPER.
2. REMOVE THE MACHINE BASE.
3. LOOSEN TWO SETSCREWS, AND ADJUST THE TIMING BY TURNING THE UPPER LOOPER
DRIVE CAM IN THE DIRECTION OF:
(A): IF THE TIMING OF UPPER LOOPER IS ADVANCED AS SHOWN IN FIG. 3.
(B): IF THE TIMING OF UPPER LOOPER IS DELAYED AS SHOWN IN FIG. 4.
THE ALLOWANCE IS O.2TO 1.2 MM FROM THE LEFT EDGE OF LOWER LOOPER EYE AS SHOWN
IN FIG. 1.
4. TIGHTEN TWO SETSCREWS.
5. CHECK THE CLEARANCE BETWEEN THE LOOPERS.
6. ATTACH THE MACHINE BASE.
LOWER
R LOOPER
(FIG. 1)
\
(FIG. 2)
(FIG. 4)
SETSCREWS
MARKING-OFF LINE
UPPER LOOPER DRIVE CAM
21
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