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9. STANDARD ADJUSTMENTS
RH-981A
66
9-16. Adjusting the trimming of the upper thread
The upper thread should be trimmed at the correct time after sewing is completed.
<-00, -01>
Adjust so that the upper movable knife (1) cuts only
one of the threads in front of the right looper (2).
Note: If both strands of the thread loop are cut, the
thread remaining in the needle may become
too short and skipped stitches may result.
<-02,-52>
Adjust so that the upper movable knife (3) cuts only
one of the threads in front of the right looper (4).
Note: If both strands of the thread loop (forward and
back) are cut, the thread remaining in the
needle may become too short and skipped
stitches may result.
9-17. Adjusting the trimming of the lower thread and gimp
<-00, -01>
The lower thread and gimp should be trimmed at the correct time after the feed bracket has returned to the home
position.
Thread trimming operation can be checked in steps while manual mode is active. (Refer to “7-8. Using manual
mode”.)
1. The mechanism is adjusted so that the lower thread and gimp are separated from each other and spread by the
thread handler (1).
2. The lower thread is held between thread nipper M (2) and thread nipper D (3) on the plate spring.
The gimp is held between thread nipper M (2) and thread nipper U (4) on the plate spring.
3. Adjust so that the edge of the fixed knife (6) and the index mark (8) on the movable knife (7) are aligned when the
thread trimmer arm (5) is at the maximum stroke.
3101Q
3100Q
3102Q
3103Q