JUKI LH-4128-7, Руководство инженера

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3) Needle bar height
o LH-4128, LH-4128-7
1. Set stitch dial “Minimum”.
2. Turn the handwheel to bring needle bar to the lowest dead point.
3. Loosen the needle bar connecting setscrew .
4. Align the upper marker line engraved on the needle bar with the
lower end face of the needle bar rocking base and tighten the needle
bar connecting setscrew .
o LH-4168-7, LH-4188-7
1. Set the stitch dial at “Minimum”.
2. Turn the handwheel to bring needle bar to the lowest dead point.
3. Remove the cap , and loosen the setscrew .
4. Align the uppermost marker line engraved on the needle bar with
the lower end face of the needle bar rocking base and tighten the
tightening screw at a tightening torque of 5.9N•m (60kgf•cm).
(Caution) 1. After the adjustment, the needle entry point in the
needle slot in the feed dog may change.
2. When tightening the setscrew , make sure not to shift
the needle throwing drive arm in the direction of the
arrow.
(When the DPX17 is used)
While the DPX17 is used, the second engraved marking line from the
bottom of the needle bar shall be made to coincide with the lowest
face of the needle bar rocking base .
o Change in height of the needle
bar may result in stitch skipping
or thread breakage.
o If the needle throwing drive arm
is shifted, this can be a cause
of needle bar torque or needle
bar lock-up.
Adjustment Procedure Results of Improper Adjustment