38
14) 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 clearance 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.
[ Fig. 59 ]
Hand Pulley Shaft
Upper Shaft
Roller
Hand Pulley
Bushing
13) 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.
[ Fig. 58 ]
[ Caution ]
Be careful not to touch with any other metals except
take-up lever spring. If it does, detection may be failed.
Thread Take-up
Spring
Thread
Detecting
Plate
Screw
12) 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 face of the thread
tension control device shaft clockwise. And to make
the spring relax, turn it counerclockwise.
[ Fig. 57 ]
①
Thread Take-up
Spring
②
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