54 BA_KA-ED_A22_190313_en.doc
Unintended skip stitching
Possible reasons:
- wrong looper setting
- wrong setting of loop stroke/needle stroke, therefore insufficient loop
formation (small/big)
- needle lever has too much play 121.0832/212.0834
(see Spare parts catalogue page 26 bzw. 30)
Solutions:
- operate machine manually, check the looper motion
- check the settings, re-set, if necessary, replace damaged parts
- Replace parts: Lever left complete 321.0159 respectively Lever right
complete 421.0159 (see Spare parts catalogue page 26 respectively 30)
The fabric is marked or damaged
Possible reasons:
- pressure of cloth retainer too high
- wrong setting of feed plates pressure
- damaged sewing tools (lower side of needle plate)
- unsuitable needle or thread size
Solutions:
- check pressures, sewing tools and their functions, replace or repolish
damaged parts
- choose most suitable needles and threads
The stitch line is no longer straight.
Possible reasons:
- The foam rubber ((7 Fig. 28) is worn out.
- When contact roller ((6) Fig. 28) (differential transport) is closed, there is
air between the contact roller and the foam rubber. Either the foam
rubber is worn out or the parallelism of the contact roller is no longer
correct.
- Foam roll ((10) Fig. 24) worn or soiled.
Solutions:
- The foam rubber must be replaced. In most case, every eight weeks. By
loosening the three screws ((8) Fig. 28) that secure touch rail ((3) Fig. 28) to
the affixed reflex foil, the old foam rubber can be removed and replaced
(without stretching it).
- Open the cylinder head screws (4) and (5) (Fig. 28) to restore parallelism.
- Clean or replace.
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