JUKI LU-2800 Series, Руководство инженера

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Adjustment procedures Results of Improper adjustment
1) Position of the counter knife and the clamp spring
[Position of the counter knife]
1. Loosen setscrews
❶ (1-needle: 2 positions, 2-needle: 4 posi-
tions) of the counter knife.
2. Press the edge of counter knife ❸ against the step difference
of counter knife base ❷ .
3. Adjust so that the distance from mounting groove of the slide
plate to top end of the counter knife ❸ is 37 ± 0.1 mm (A) (LU-
2818-7, 2868-7 : 34.5 ± 0.1 mm).
4. Tighten setscrews
❶
(1-needle: 2 positions, 2-needle: 4 posi-
tions) of the counter knife.
[Position of the clamp spring]
1. Loosen setscrews
❹ (1-needle: 2 positions, 2-needle: 4 posi-
tions) of the clamp spring.
2. Press the edge of clamp spring
❺
against the step difference
of counter knife base ❷ .
3. Slide the clamp spring ❺ while making it press against the step
difference of the counter knife base ❷ , and adjust the distance
to 3.7 ± 0.1 mm (B).
4. Tighten setscrews ❹ (1-needle: 2 positions, 2-needle: 4 posi-
tions) of the clamp spring.
(Caution) When the position of counter knife ❸ and clamp
spring ❺ is moved, re-adjust the position of counter
knife base ❷ and the knife pressure.
When dimension A is larger :
o
Length of bobbin thread clamp
is shortened and stitch skipping
occurs.
o
Setting/taking out bobbin cannot
be performed.
When dimension A is smaller :
o
Thread trimming failure will be
caused.
When dimension B is larger :
o
Bobbin thread clamp failure oc-
curs.
o
Stitch skipping at the start of
sewing will be caused.
When dimension B is smaller :
o
It is difficult to take out cloth
since needle thread have been
clamped, and the trouble that
bobbin thread clamp is simulta-
neously removed will be caused.
o
Clamp spring
❺
interferes with
the rear edge of moving knife.
As a result, deformation of clamp
spring
❺ or the like will occur.