Service manual

X
A
Released: 10/2013
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D - MACHINE ADJUSTMENT
11. UPPER THREAD TENSION
The amount of the thread required for sewing another buttonhole changes with the conditions and quality of the sewn
workpiece. Thin materials usually require more thread at the beginning of sewing than thick materials. If more than
one kind of fabric is being sewn, it is suitable to make the adjustment on the thinnest/lightest fabric.
11.1. Thread tensioner tilts in the direction → X when the machine sews the buttonhole eye. Do the adjustment when
ithe machine is in the home position. (When CA set up)
11.2. To obtain thread
1
beginning as long as possible, loosen the screws
2
and turn the cam
3
all the way to the
point with the pin
4
at the cam stroke
3
. Then tighten the screws well
2
. To shorten the length of the thread
1
at
the beginning of sewing, adjust the position of the cam
3
in the direction of the arrow A → as needed.
S-101.M
1-39