JUKI MB-373 Manual page 13

Adjustment Procedures
1) Perform adjustment to provide the 2.4 mm clearance after
loosening screw 1 of the stop motion tripping lever. Remove
the stop motion disc pressure lever and the needle driving
pulley, insert a 2.4 mm gauge or a 3 mm wrench between
the stop motion plunger and the stop motion disc, and tighten
srew 1 of the stop motion tripping lever since the stop motion
lever shaft becomes loose.
2.4 mm
Adjust with a 2.4 mm
gauge or a 3 mm wrench.
2) Perform adjustment to provide the 8.5 mm clearance by the
stop motion adjusting nut 2.
™ Make adjustment by turning the pressure adjusting nut.
Make adjustment by loosening screw
™
clamp lifting link lever.
1
Stop motion
tripping lever
(Caution) Adjust the clearance when
the stop motion tripping
lever is not in the convex
section of the stop motion
cam.
2
1
of the button
1
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Results of Improper Adjustment
™ If the clearance is larger than 2.4
mm, unstable entrance into the
stop-motion state will result. On the
contrary, if the clearance is smaller
than 2.4 mm, the stop motion disc
may come in contact with the stop
motion plunger during operation, or
the machine may not start.
™ If the clearance is larger than 8.5
mm, the shock noise of the stop
motion is high or the stop motion
plunger comes off.
On the contrary, if the clearance is
smaller than 8.5 mm, the position
of the stop motion disc becomes
unstable at the time of stop motion.
™ Insufficient pressure will cause the
attached button to trail a 10 to 20
mm thread end of the beginning
stitch on the wrong side of the
fabric.
If the clearance is too large, the
™
button clamp will not lift at the time
of stop-motion.
If the clearance is too small, the
button clamp lifting link may come
in contact with the button clamp
forked rod during operation
resulting in producing abnormal
noise.
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