JUKI LU-2800 Series, Руководство инженера

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WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble Cause Checking Corrective measures
4. Stitch skipping 4-1) Clearance between the needle and
the blade point of hook is too large.
1-A) Check the clearance. Refer to “2.-(6) Needle-to-hook timing”.
4-2) Needle-to-hook timing is excessively
advanced or retarded.
2-A) Check the specified dimension. Refer to “2.-(6) Needle-to-hook timing”.
4-3) Presser foot is rising. (Pressure of the
presser foot is too low.)
3-A) Check the pressure of the
presser foot.
Tighten the presser spring regulator.
4-4) Height of the needle bar is improper. 4-A) Check the lowest point of the
needle bar.
Refer to “2.-(6) Needle-to-hook timing”.
4-5) Blade point of the hook is blunt. 5-A) Check the blade point of the
hook.
Correct the blade point of the hook or replace the
hook with a new one.
4-6) Improper type of needle is used. Replace the needle with one which is thicker than
the current needle by one count.
4-7) Hook needle guard is not unctioned. 7-A) Check the functional amount of
the needle guard.
Refer to “2.-(6) Needle-to-hook timing”.
4-8) Thread take-up spring excessively
works or the stroke of the spring is
too small.
Decrease the tension of the thread take-up spring
and increase the stroke of the spring.
4-9) Feed timing is not proper. Refer to “2.-(8) Feed adjustment”.
4-10) Needle thread tension is too high. Adjust the needle thread tension.
4-11) The stitch length at the beginning of
sewing is long.
Enable the condensation stitching function for the
beginning of sewing.