JUKI LU-2810 Series Engineer's Manual page 43

海外講習会用121122 LU-2810(-7)_EM
1) Position of the counter knife and the clamp spring
[Position of the counter knife]
1. Loosen setscrews 1 of the counter knife.
2. Press the edge of counter knife 3 against the step difference
of counter knife base 2 .
3. Adjust so that the distance from mounting groove of the slide
plate to top end of the counter knife 3 is 37 ± 0.1 mm (A).
4. Tighten setscrews 1 of the counter knife.
[Position of the clamp spring]
1. Loosen setscrews 4 of the clamp spring.
2. Press the edge of clamp spring 5 against the step difference
of counter knife base 2 .
3. Slide the clamp spring 5 while making it press against the step
difference of the counter knife base 2 , and adjust the distance
to 3.7 ± 0.1 mm (B).
4. Tighten setscrews 4 of the clamp spring.
(Caution) When the position of counter knife 3 and clamp
spring 5 is moved, re-adjust the position of counter
knife base 2 and the knife pressure.
Adjustment procedures Results of Improper adjustment
When dimension A is larger :
Length of bobbin thread clamp
o
is shortened and stitch skipping
occurs.
Setting/taking out bobbin cannot
o
be performed.
When dimension A is smaller :
Thread trimming failure will be
o
caused.
When dimension B is larger :
Bobbin thread clamp failure oc-
o
curs.
Stitch skipping at the start of
o
sewing will be caused.
When dimension B is smaller :
It is difficult to take out cloth
o
since needle thread have been
clamped, and the trouble that
bobbin thread clamp is simulta-
neously removed will be caused.
Clamp spring interferes with the
o
rear edge of moving knife. As
a result, deformation of clamp
spring or the like occurs.
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