34
77
CAUSE OF BREAKDOWN AND TROUBLESHOOTING
No.
1
2
3
Condition of Breakdown
Error on operation or
drive of machine
Cause of Breakdown
Loosing of belt tension and damage
on belt
Fuse shortage for main power or
circuit
Deviation from Y and Y limit of
feed bracket
Troubleshooting
Adjust the belt tension or exchange it
Check the fuse shortage of main shaft
drive motor in a controller box or
exchange it
Bad position of
stopping position
Slackness of main drive belt
Due to improper synchro position
Adjust the belt tension
Adjust setting position of synchro
Needle bent
4
Thread is cut
5
Stitch skipping
Damage on needle(Bending of
needle, cracks on needle hole or
groove, and abrasion or
transformation of needle tip)
Exchange the needle
Move the feed bracket to normal place
(inside limit switch)
Wrong installation of needle
Install the needle properly
Contact of needle with shuttle
Adjust the distance properly between a needle and shuttle
Wrong insertion of thread Insert the thread properly
Wrong installation of needle (Height
of needle or direction of needle)
Reinstall the needle.
Damage on needle (Bending of
needle, cracks on needle hole or
groove, and abrasion or
transformation of needle tip)
Exchange the needle.
Excessive tension of upper thread and under thread
Adjust the tension
Excessive tension and stroke of
take-up lever spring
Adjust the tension and stroke of take-
up lever spring
Crack on the controlling hole of
shuttle surface spring
Exchange the shuttle surface spring
Use of bending needle
Exchange the needle.
Use of improper sized needle compared with using thread
Exchange the needle.
Wrong installation of needle Reinstall the needle.
Improper timing for needle and shuttle
Readjust the timing for needle and shuttle
Improper gap between groove and shuttle point
Readjust the timing for needle and shuttle
Excessive tension of take-up lever
spring and stroke
Adjust the tension of take-up lever
spring and stroke
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