JUKI LU-2810 Series, Engineer'S Manual

Page: 79 / 84

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WARNING :
Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble Cause Checking Corrective measures
From the previous page
3-3) Moving knife stops during operation. 3-A) Thread is too thick. Use thread within the specified value.
3-B) Thread trimmer timing is excessively
retarded.
Refer to “2.-(17)-6) Thread trimmer cam timing”.
3-C) Needle thread tension is too high. Decrease the tension of the thread tension No. 1.
3-D) Tension of the bobbin thread is too high. Adjust the tension of bobbin thread.
3-E) Knife pressure of the counter knife is too
high.
Refer to “2.-(17)-4) Adjusting the knife pressure”.
3-F) Initial position of the moving knife is ex -
cessively advanced.
Refer to “2.-(17)-6) Thread trimmer cam timing”.
3-G) Thread is not cut sharply. Refer to causes “Thread cannot be trimmed” and
“Thread remains uncut after trimming”.
3-4) Needle thread is not caught. 4-A) Stitch skipping at the last stitch. Refer to “2.-(6) Needle-to-hook timing”.
4-B) Check the thread trimmer cam timing. Refer to “2.-(17)-6) Thread trimmer cam timing”.
4-C) Top end of the moving knife is broken or
has burrs.
Replace the moving knife with a new one.
3-5) Bobbin thread is not caught. 5-A) Stroke of the moving knife is small. Refer to “2.-(17)-3) Vertical position of the moving
knife”.
5-B) Check the routing of bobbin thread. Correctly thread bobbin thread.
5-C) Top end of the moving knife has broken
or been scratched.
Replace the moving knife with a new one.
5-D) Check the height of moving knife. Adjust the height of moving knife.
5-E) Thread trimming is performed at the po-
sition where there is no sewing product.
Perform thread trimming while pulling sewing product
in the feed direction.
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海外講習会用121122 LU-2810(-7)̲EM