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No.
Type of Breakdown
Ineffective sense of upper
6
thread
Poor quality of thread
7
tightening
8
Mistakes of Trimming
Cause
Bad connection between take-up lever
spring and detecting plate
Bad connection of wire with thread sensor
plate
Weak tension of upper thread
Weak tension of under thread
Improper timing of needle and shuttle
Slackness of exchange tension between
moving mes and fixed mes
Groove abrasion on blade of moving mes
and fixed mes
Wrong position of trimming cam
Troubleshooting
Clean up the take-up lever spring and detecting
plate. Adjust the tension of take-up lever spring
and connecting condition of detecting plate
Reconnect the wire with thread sensor plate
Adjust the tension of upper thread
Adjust the tension of under thread
Readjust the timing of needle and shuttle
Adjust the tension of fixed mes
Exchange the moving and fixed mes
Readjust the position of trimming cam
43
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