JUKI LH-4128-7, Руководство инженера

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1. Turn the hand wheel until it reaches the lower dead point of the
needle bar.
2. Confirm that the engraved marker line of the sprocket is in parallel
to the upper plane of the bed and that the first screw of the
sprocket is located on the worker side.
3. ATurn the hand wheel to the adjusting position.
o LH-4188-7 : Let the machine stand still with the needle bar left
(= 180
°
) positioned at the lower dead point.
o LH-4128 (-7) : Make a reverse rotation by 13.6mm with the hand
LH-4168-7 : wheel positioned on the outer periphery.
(= 167.5
°
)
4. Adjust the lower shaft to the position where the needle bar does not
rock in the feeding direction even though the hand wheel is fixed,
the lower shaft is turned, and the reverse feed lever is pushed.
(At that time, the engraved marking dot of the lower shaft almost
coincides with the engraved marking line of the sprocket. LH-4128
(-7), LH-4168-7).
5. Fasten the first screw of the sprocket and then the second screw
.
(The third screw is used for bottom feed.)
If the timing between the main shaft
and lower shaft does not match,
thread trimming timing, needle
entry in the feed dog slot and the
feeding phase will change.
The thread tension and puckering
will also change.
When the stitching pitch changed,
the hook timing deviation becomes
large.
Adjustment Procedure Results of Improper Adjustment