JUKI MEB-3200 Engineer's Manual page 122

Phenomenon
10. The left- and right-hand sides of the
seam at the straight section of the
buttonhole are not uniform.
11. The shape of the eyelet is deformed.
12. The seam is cut by the cut-after
knife.
13. Needle thread cannot be trimmed.
14. Looper thread cannot be trimmed.
• S/R types only
• J/C types only
15. The cloth cannot be cut sharply.
16. Looper breakag
Cause
10-1) The left- and right-hand side cloth opening amounts
are not equal.
10-2) Improper adjustment of the knife dropping position
10-3) There is shrinkage of cloth by sewing or step difference
between left- and right-hand sides of cloth.
10-4) Material is not prssed partially
11-1) The seam is tilted.
11-2) The cloth is deformed by the seam.
11-3) Improper adjustment of the knife dropping position
11-4) The cloth at eyelet section is flopping.
11-5) The gimp is moved to the inside needle side.
12-1) The clearance between the cloth cutting knife and the
needle is too small.
12-2) Improper adjustment of the knife dropping position
12-3) There is shrinkage of cloth by sewing or step difference
between left- and right-hand sides of cloth.
13-1) The needle thread trimming knife is dull.
13-2) The stroke of the needle thread trimming knife is
incorrect.
13-3) The needle thread trimming knife does not catch needle
thread.
13-4) The last stitch has skipped.
13-5) Installing position of the knife is improper.
13-6) Thread does not reach the blade point. (Clearance
between the knife and needle is large.)
14-1) The knife is dull.
14-2) The stroke of the moving blade is incorrect.
14-3) Contact of the moving knife and the counter knife is
improper.
14-4) Installing position of the thread separating plate is
incorrect.
14-5) The knife pressure is insufficient.
15-1) Doubling the planes of the knife and the knife holder is
incorrect.
15-2) The knife is dull.
15-3) Knife pressing amount (knife pressure) is insufficient.
15-4) Chip has collected.
15-5) Knife pressure is too high and the knife blade has
broken.
16-1) The clearance between the needle and the looper
varies according to the angle (0˚, 90˚ and 180˚).
16-2) The clearance between the needle and the needle
guard is too large or the needle and the needle guard
come in excessive contact with each other.
16-3) The needle does not fit the kind of throat plate (needle
size used).
118
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• Adjust so that the left- and right-hand side cloth opening
amounts are equal.
• Check and adjust the knife dropping position.
• Individually set the left- and right-hand sides of cut space.
1 Correct the presser foot.
2 Increase the presser pressure.
• Set the turning compensation/parallel section turning
compensation.
• Set the eyelet crosswise compensation/lengthwise
compensation.
• Check and adjust the knife dropping position.
• Correct the presser foot or replace it with a new one.
• Replcae the throat plate with the optional one.
• Check the cut (eyelet) space and re-set it.
• Check the knife dropping position, and correct or adjust it.
• Individually set the left- and right-hand sides of cut space.
• Grind the knife or replace it with a new one.
• Check and adjust the stroke.
• Adjust the installing position (clearance between needle
and knife) of the knife.
• Refer to "1. Stitch skipping".
• Check and adjust the needle thread trimming knife and the
thread separating position.
• Approach the knife to the needle. (Adjustment)
• Grind the kinfe or replace it with a new one.
• Check and adjust the stroke.
• Check and adjust the tilt of the counter knife.
• Check and adjust the needle thread trimming knife and the
thread separating position.
• Adjust the knife pressure.
• Correct the surface of the knife holder with oil stone or the
like. When replacing knife/knife holder, be sure to use it
after correcting the tilt.
• Grind the knife or replace it with a new one.
• Re-set the pressing amount (knife pressure).
• Remove the chip.
• Set proper knife pressure to each sewing product after
replacing the knife.
• Adjust the center of the needle.
• Check and adjust the clearance.
• Use the throat plate suitable for the needle.
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Corrective measure