Thread breakage
Possible causes:
- Sharp edges or grooves in the needle guide, thread take-up lever,
looper
or needle’s eye after the machine has been used for a long time.
- Looper or loop stroke incorrectly adjusted or has been moved, the
thread loops are not always caught.
- Thread tension is too high
- Thread thickness does not correspond to the needle thickness
(thread too thick)
Solutions:
- Replace or repolish the damaged parts
- Correct the looper setting and/or loop stroke
- Correct the thread tension, check the thread movement.
- Choose a suitable thread thickness
Always observe: Thread movement, thread, needle plate with
corresponding plunger and cloth retainer, tested
needles and thread tension must correspond to the
sewing material being processed!
Imprecise blind stitching
Possible causes:
- Often worn or damaged needle
- Cloth retainer or setting is incorrect
- Needle plate or needle guide is incorrectly set
- Center needle guard damaged or worn
- Needle thickness is not suitable (to thin)
- Damaged or incorrectly adjusted plunger
Solutions:
- Replace any damaged needles, use the correct needle thickness
- Check the settings and correct if necessary
- Replace the center needle guard
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