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Adjustment Procedures Results of Improper Adjustment
◯ In case of LU-1510-7 and LU-1508H
1. Set the stitch dial to the maximum.
2. At this time, loosen hexagon headed bolt ③ in the feed
regulator to adjust so that a clearance of 1 ± 0.5 mm is
provided between reverse feed control lever ① and reverse
feed control lever stopper ② .
◯ In case of LU-1510 and LU-1508
1. Set the stitch dial to “0” mm.
2. At this time, loosen hexagon headed bolt ③ in the feed
regulator to adjust so that a distance of 52.5 ± 0.5 mm is
provided between the top surface of the machine bed and
reverse feed control lever ① .
(Standard)
• Bottom surface of the reverse feed control lever is almost
flush with the top surface of the machine bed.
(Caution) • Check that the reverse feed control lever does
not interfere with the machine bed or machine
arm when the stitch dial is set to the maximum.
The safety clutch functions when an excessive load is applied to
the hook driving shaft or the like during sewing. When the safety
clutch functions, the hook will not rotate even if turning the
handwheel, and the hook driving shaft sprocket wheel only will
run idle since the power is not transmitted to the hook driving
shaft.
● Resetting procedure
1. Check the moving part of the sewing machine, and look for
and remove the cause which the safety clutch has functioned.
2. Pressing push button ① located on the top surface of the
machine bed, strongly turn the handwheel in the reverse
direction of rotation.
3. Resetting procedure completes when the handwheel cannot
be turned with “click”.
● Adjusting the working torque of the safety clutch
1. Tilt the machine head.
2. Turn torque release adjusting screw ② located at the periphery
of hook driving shaft sprocket wheel to adjust the torque
release.
● When the position of the reverse
feed control lever is low :
Reverse feed control lever
interferes with the machine bed and
the stitch length of the reverse feed
stitching will be decreased.
● When the position of the reverse
feed control lever is high :
Reverse feed control lever
interferes with the stopper or the
machine arm and stitch length of the
normal feed stitching will be
decreased.
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