JUKI LU-1520N-7 Manual page 37

Adjustment Procedures
™ Longitudinal direction
1. Loosen setscrews 1 and remove clamp spring base 2.
2. Loosen setscrews 4 and adjust so that the distance from the
end of clamp spring base 2 to the top end of clamp spring 3
is 24.3±0.1 mm.
3. Assemble again clamp spring base 2 to the thread trimmer
base and tighten setscrews 1 so that clamp spring base 2
comes in close contact with the end of the thread trimmer base.
Confirmation : Check that the distance from the top end of
clamp spring 3 to the end of the machine bed is 28.3±0.2
mm.
™ Clamp pressure
1. Loosen setscrews 1.
2. Move clamp spring base 2 in the direction of the arrow by
approximately 0.5 mm from the state that clamp spring 3
comes in contact with moving knife 5. (Clamp spring base 2
should come in close contact with the end of the thread trimmer
base.)
3. Tighten setscrews 1.
Results of Improper Adjustment
When the clamp spring is located
in the front :
™ Clamp spring interferes with the
moving knife to cause the spring
and the knife to break.
When the clamp spring is located
in the rear :
™ Defective clamp will result.
When the clamp pressure is
excessively low :
™ Stitch skipping at the start of
sewing will result.
When the clamp pressure is
excessively high :
™ "Puckering" may be produced on
cloth at the start of sewing.
™ Moving knife interferes with the
clamp spring to cause them to
break.
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