35
No.
6
7
Condition of Breakdown Cause of Breakdown
Weak tension of upper thread
Weak tension of lower thread
Troubleshooting
Readjust the tension of upper thread.
Errorin thread tightening
Improper timing for needle and
shuttle
Laxity of exchanging tension between
movable mes and fixed mes
Readjust the timing for needle and shuttle
Readjust the tension of fixed mes.
Error in trimming
Abrasion and crack on blade of movable mes
and fixed mes
Exchange the movable mes and fixed mes.
Readjust the tension of lower thread.
Wrong position of trimming cam.
Readjust the position of trimming cam
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