44
No.
1
2
3
Typed of Break-down
Error on operation or
drive of machine
Cause
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
Wrong position of upper shaft sensor
plate or photo sensor
Adjust the belt tension
Adjust the position of upper shaft sensor
plate or exchange the photo sensor
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 installing of needle Reinstall of needle
Improper timing for a needle and
shuttle
Reinstall the timing for a needle and shuttle
Large interval between a needle
groove and shuttle point
Reinstall the downward point of needle
Excessive tension of take-up lever
spring and stroke
Adjust the tension of take-up lever spring
and stroke
77
CAUSE OF BREAK-DOWN AND TROUBLESHOOTING
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