JUKI MO-2500 - Page 85

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Trouble Case (1) Case (2) Check and Corrective measures
14. Uneven material feed 14-1) Presser foot pressure 1-A) The presser foot pressure is too high. Reduce the presser foot pressure except for the
uneven material feed due to puckering.
14-2) Presser foot 2-A) The hinge is too sti󰀨. Remove the sti󰀨ness provided no hinge play is
produced. Replace the presser foot with a new one.
2-B) Scratches on or defective nish on the
presserfoot sole produce friction be- tween the presser foot and materials.
Bu󰀨 the presser foot sole for good surface n- ish.
14-3) Tilt of feed dogs 3-A) The front is too high. Make the front down. However, be sure to align
the di󰀨erential feed dog with the main feed dog.
14-4) Height of feed dogs 4-A) A di󰀨erent in level exists between the
main feed dog and di󰀨erential feed dog.
Eliminate the di󰀨erence in level.
14-5) Adjustment of di󰀨eren-
tial feed
5-A) The di󰀨erential feed has been improper-
ly adjusted.
Provide di󰀨erential feed suited to the material.
15. Puckering 15-1) Needle 1-A) The needle is too thick. Use a thin needle as much as possible.
15-2) Thread 2-A) The thread used is too thick. Use a thin thread as far as possible.
15-3) Thread tension 3-A) Both the needle thread and looper
thread tensions are too high.
Reduce the both thread tensions to a minimum.
15-4) Feed dogs 4-A) The leading edge of the feed dog teeth
has been rounded o󰀨.
Replace the feed dog.
4-B) A di󰀨erence in level exists between the
main feed dog and di󰀨erential feed dog.
Eliminate such di󰀨erence in level.
15-5) Presser foot pressure 5-A) The presser foot pressure is not high
enough, providing poor ironing e󰀨ect.
Increase the presser foot pressure.
15-6) Di󰀨erential feed ratio 6-A) The di󰀨erential feed ratio has been set
for gathering.
Set it for stretching. When stretching light- weight materials, be careful not to cause the presser foot to contact unevenly with the mate- rials.