JUKI LH-4128-7, Руководство инженера

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Stop position after thread trimming
(1) The standard needle stop position is obtained by aligning marker dot
A
on the pulley cover with white marker dot
B
on the handwheel.
(2) Stop the needle in UP position, turn OFF the power, and loosen
screw to perform adjustment within the slot of the screw. The
needle stop timing is advanced if you move the screw in the direction
of
C
.
The needle stop timing is delayed if you move the screw in the
direction of
D
.
(Caution) Do not operate the machine with screw loosened. Just
loosen the screw, and do not remove it.
Lower stop position
(1) When the pedal is moved from front part depression to neutral, the
lower stop position of the needle will be located in the section
where the needle thrusts the feed dog and the upper end of the
needle hole coincides with the upper surface of the feed dog.
(2) Like stoppage in UP position, stop the needle in DOWN position,
turn the power OFF, and loosen the screw within the range of the
oblong hole. The needle stop motion is fastened if the screw is moved
in the direction of
E
, and delayed if it is moved in
F
.
(Caution) Do not operate the machine with screw loosened. Just
loosen the screw, and do not remove it.
o If the needle-up stop position of
the sewing machine is not
p r o p e r l y a d j u s t e d , t h r e a d
trimming failure will result. The
cam roller will not come off the
thread trimming cam at the time
of thread trimming, but will come
off from the cam at the start of
next sewing with a noise.
o The timing to detect the needle-
down stop position of the sewing
machine should be advanced the
most. If the timing is retarded,
troubles will result such that the
thread trimmer fails to cut the
thread, reverse-feed stitches
may not to be sewn accurately
on the normal-feed stitches at the
t i m e o f a u t o m a t i c r e v e r s e
stitching or the needle thread will
be insufficiently tensed at the
corner of a material at the time
of sewing the corner.
A
A
Early
Late
Adjustment Procedure Results of Improper Adjustment