5-14
5-9) THREAD WINDER
1) Lower thread winding
① Insert the bobbin into the thread winder shaft as in [Fig. 5-19]. Wind the bobbin 5-6 times by hand in the
thread winding direction. Then press the start button, and the thread winding begins.
② If the thread winding status is poor, press the stop button. Then the winding stops immediately.
2) Adjustment of bobbin thread volume
① When winding thread around the bobbin, the thread volume should be some 80% of the bobbin size in terms of
diameter as in [Fig. 5-20].
② Bobbin thread volume is adjusted by the thread
winder knob. When the knob is turned clockwise,
the bobbin thread gets thicker. When the knob is
turned counter-clockwise, the bobbin thread gets
thinner.
[Fig.5-19]
Knob
Tension adjusting holder
Tightening screw for the tension adjusting holder
Bobbin axis
Bobbin
Thread tension adjusting nut
[Fig.5-20]
[Fig.5-21]
80%
Decrease
Increase
Knob
3) Adjustment of bobbin thread status
① The thread should be wound around the bobbin in
parallel. Otherwise, loosen the tightening screw
for the thread winder's tension adjusting holder
and move the thread guide body left or right for
adjustment.
② The tightness of thread winding on the bobbin
can be adjusted with the tension adjusting nut.
[Fig.5-22]
Thread tension
adjusting nut
Tension adjusting holder
Tightening screw for the tension
adjusting holder
[CAUTION]
1. If the bobbin thread volume is too high, the
lower thread is not properly released.
2. When the lower thread is wound by 80% of
the standard bobbin size, it means some 80m.
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