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Adjustment Procedures Results of Improper Adjustment
1) Position of the counter knife and the clamp spring
1. Loosen setscrews 1 in the counter knife.
2. Make the edge of counter knife 3 come in contact with the
step difference of counter knife base 2.
3. Adjust the distance from the edge of counter knife base 2 to
the top end of counter knife to 3 dimension A.
4. Tighten setscrews 1 in the counter knife.
Position of the clamp spring
1. Loosen clamp spring setscrews 4.
2. Make the edge of clamp spring 5 come in contact with the
step difference of counter knife base 2.
3. Slide the clamp spring while making it come in contact with the
step difference of the counter knife base, and adjust the
distance to dimension B.
4. Tighten clamp spring setscrews 4.
For the details, refer to the list below.
(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.
List
When dimension A is larger
™ Length of bobbin thread clamp
is shortened and stitch skipping
occurs.
™ Setting/taking out bobbin cannot
be performed.
When dimensionA is smaller
™ Thread trimming failure will be
caused.
When dimesion B is larger
™ Bobbin thread clamp failure
occurs.
™ Stitch skipping at the start of
sewing will be caused.
When dimension B is smaller
™ It is difficult to clamp needle
thread and take out cloth, and
the trouble that bobbin thread
clamp is simultaneously
removed will be caused.
™ Clamp spring interferes with the
rear edge of moving knife and
deformation of clamp spring or
the like occurs.
Position of right clamp
spring
Thickness of part A is 3.5
mm. Insert this part
between counter knife 3
and clamp spring 5, and
adjust clamp spring 5 so
that there is no
clearance.
LU-1510N-7
LU-1511N-7
LU-1560N-7
LU-1561N-7
Position of left clamp
spring
Thickness of part B is 4.5
mm. Insert this part
between counter knife 3
and clamp spring 5, and
adjust clamp spring 5 so
that there is no
clearance.
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