JUKI MEB-3200 Manuel D'utilisation page 81

Phenomenon
6. Looper thread breakage
7. Needle breakage
• Without needle thread clamp
8. Stitches at the straight section
o f t h e b u t t o n h o l e a r e n o t
uniform.
9. The left- and right-hand sides
of the seam at the straight
section of the buttonhole are
not uniform.
10. The shape of the eyelet
is deformed.
11. The seam is cut by the cut-
after knife.
12. Needle thread cannot be
trimmed.
13. Looper thread cannot be
trimmed.
• S/R types only
• J/C types only
14. The cloth cannot be cut
sharply.
15. Breakage of looper/spreader
Cause
• The looper thread tension is too high.
• The installing position of the left-hand
spreader is incorrect.
• Refer to "5. Needle thread breakage" for details
on other causes and corrective measures.
• The needle interferes with looper, spreader, etc.
• The needle comes in contact with the presser foot.
• The clearance between the needle and the
looper varies according to the turning angle (0˚,
90˚ and 180˚).
• 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.
• The height of the needle bar has been
improperly adjusted.
• The needle does not fit the kind of throat plate
(needle size used).
• Needle thread is depressed by the presser foot
at the start of sewing.
• The left- and right-hand sewing pitches at the
straight section are different from each other.
• The left- and right-hand positions at the straight
section are different from each other.
• Stitches which should be parallel are slant.
• The left- and right-hand side cloth opening
amounts are not equal.
• Improper adjustment of the knife dropping position
• There is shrinkage of cloth by sewing or step
difference between left- and right-hand sides of cloth.
• The seam is tilted.
• The cloth is deformed by the seam.
• Improper adjustment of the knife dropping position
• The cloth at eyelet section is flopping.
• The gimp is moved to the inside needle side.
• The clearance between the cloth cutting knife
and the needle is too small.
• Improper adjustment of the knife dropping position
• There is shrinkage of cloth by sewing or step
difference between left- and right-hand sides of cloth.
• The needle thread trimming knife is dull.
• The stroke of the needle thread trimming knife is incorrect.
• The needle thread trimming knife does not catch
needle thread.
• The last stitch has skipped.
• Installing position of the moving blade is
incorrect.
• The knife is dull.
• The stroke of the moving blade is incorrect.
• Contact of the moving knife and the counter
knife is improper.
• Installing position of the thread separating plate
is incorrect.
• The knife pressure is insufficient.
• Doubling the planes of the knife and the knife
holder is incorrect.
• The knife is dull.
• Knife pressing amount (knife pressure) is insufficient.
• Chip has collected.
• Knife pressure is too high and the knife blade
has broken.
• The clearance between the needle and the
looper varies according to the angle (0˚, 90˚ and
180˚).
• 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.
• The needle does not fit the kind of throat plate
(needle size used).
Corrective measure
• Adjust the sewing conditions to obtain an appropriate
thread tension.
• Check and adjust the installing position.
• Adjust the clearance between the looper and the needle
properly. Adjust the timing to open/close the spreaders properly.
• Check and adjust the clearance.
• Adjust the center of the needle.
• Check and adjust the clearance.
• Check and adjust the height of the needle bar.
• Use the throat plate suitable for the needle.
• Increase the feeding amount of needle thread.
• Compensate the length by lengthwise compensation of
left parallel section of the data compensation.
• Compensate the position by lengthwise compensation
of left eyelet of the data compensation.
• Compensate the inclination by turning compensation of
parallel section of the data compensation.
• 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.
• 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 moving blade and the thread
separating position.
• 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 moving blade and the thread
separating position.
• Adjust the knife pressure.
• Correct the surface of the knife holder with oil stone or
the like.
• 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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