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CAUSE OF BREAKDOWN AND TROUBLESHOOTING
Adjust the belt tension or exchange it.
1
No.
Condition of
Breakdown
TroubleshootingCause of Breakdown
Error on operation
or drive of machine
Loosing of belt tension and damage on belt.
Fuse shortage for main power or circuit
Deviation from Y and Y limit of feed bracket
2
Bad position of
stopping position
Slackness of main drive belt
Due to improper synchro position
Adjsut the belt tension
Adjsut setting position of synchro
3
4
5
6
7
Needle bent
Thread is cut
Stitich skipping
Errorin thread
tightening
Error in trimming
Damage on needle.(Bending of needle, cracks on
needle hole or groove, and, abrasion or
transformation of needle tip)
Exchange the needle
Wrong installation of needle
Contact of needle with shuttle
Install the needle properly
Adjust the distance properly between a needle and shuttle
Wrong insertion of therad
Wrong installation of needle (Height of needle or
direction of needle tip)
Damage on needle(Bending of needle, cracks on
needle hole of groove, and abrasion or
transformation of needle tip)
Exchange the needle.
Excessive tension of upper thread and under thread
Excessive tension and stroke of take-up lever spring
Adjust the tension
Adjust the tension and stroke of take-up lever spring
Crack on the controlling hole of shuttle surface
spring
Reinstall the needle
Insert the thread properly
Exchange the shuttle surface spring
Use of bending needle
Use of improper sized needle compared with using thread
Wrong installation of needle
Improper timing for needle and shuttle
Improper gap between groove and shuttle point
Excessive tension of take-up lever spring and stroke
Weak tension of upper thread
Weak tension of lower thread
Improper timing for needle and shuttle
Laxity of exchanging tension between movable mes and fixed mes
Abrasion and crack on blade of movable mes and fixed mes
Wrong position of trimmimg cam.
Readjust the tension of fixed mes.
Exchange the movable mes and fixed mes
Readjust the position of trimming cam
Readjust the tension of upper thread.
Readjust the tenson of lower thread.
Readjust the timing for needle and shuttle
Exchange the needle
Exchange the needle
Reinstall the needle.
Readjust the timing for needle and shuttle
Readjust the timing for needle and shuttle
Adjust the tension of take-up lever spring and stroke
1) Machine Part
Check the fuse shortage of main shaft drive motor in
a controller box or exchange it
Move the feed bracket to normal place
(inside limit switch)
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