JUKI LS-1340 Manual page 23

Adjustment Procedures
™ In case of LS-1342-7
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 LS-1340, LS-1341 and LS-1342
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 the joint face of the machine arm and bed is
almost flush (52.5 ± 1 mm) with reverse feed control lever 1.
(Caution) Check that reverse feed control lever 1 does not
interfere with the machine bed or machine arm when the
stitch dial is set to the maximum.
Adjustment Procedures
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. Checking 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.
™ Direction A → Working torque increases.
™ Direction B → Working torque decreases.
Results of Improper Adjustment
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.
Results of Improper Adjustment
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