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73 −
Ventral shape is incorrect.
Needle bend
Needle bar position is too high.
Incorrect threading
Incorrect clearance adjustment,
incorrect returning amount
Tension is too weak.
Looper thread cam timing is too fast.
Replace it with the genuine part.
Replace the needle with the new one.
Refer to standard adjustment.
Refer to threading diagram.
Refer to standard adjustment.
Increase tension.
Refer to standard adjustment.
Looper
Needle
Needle height
Threading
Looper adjustment
Looper thread tension
Looper thread cam timing
Troubles(1) Troubles(2) Cause (1) Cause (2) Corrective measures
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Needle does not scoop the
looper thread. (Triangle stitch
skip) Middle needle Left
needle
Stitch skip by middle needle
Slack of looper thread
Stitch skip by left needle
Slack of looper thread
From the library of: Diamond Needle Corp
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