33
[Fig. 51]
①
②
[Fig. 49]
[Fig. 50]
12) Adjusting the Hand Pulley Device
A. Tighten the screw after putting the hand
pulley gear and the hand pulley shaft tip
in accord.
B. Adjust the variation of hand pulley gears
and and tighten the screws.
C. Move the bushing in the direction of the
arrow to reduce the backlash between gears
and when the roller is on the end of the
pulley bushing.
11) Adjusting the Upper Thread
Detecting Device
A. Unfasten the thread detecting plate screw with
the thread off the take-up spring and make
the take-up lever spring touch the detecting
plate. Then, tighten the screw.
B. Be sure to adjust the detecting plate so the
take-up lever spring and the detecting plate
will connect with each other even when the
take-up lever spring stroke changes.
[ Caution ]
Be careful not to touch with any other metals
except take-up lever spring. If it does, detection
may be failed.
10) Adjusting the Main Thread Control
Device
A. When the tension control nut ① of the thread
control device is turned clockwise, the upper
thread is tightened and becomes loose as the
nut is turned counterclockwise. Adjust the
tension according to the sewing conditions
such as material, thread, number of stitches
etc.
B. To tighten the take-up lever spring, use a
driver to turn the groove ② on the edge facet
of the thread tension control device shaft
clockwise. And to make the spring lax, turn it
counterclockwise.
Thread Take-up
Spring
Thread Take-up Spring
Thread Detecting
Plate
Screw
Upper Shaft
Hand Pulley
Bushing
Hand Pulley Shaft
Roller
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