Duerkopp Adler 4181i, Инструкция по эксплуатации

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15
Trouble
1. Upper thread breaking.
2. Lower thread breaking.
3. Skipped stitches at the seam begin-
ning after previous thread trimming.
Cause
1.1 Incorrect threading of the upper
thread.
1.2 Excessive thread tension.
1.3 Needle incorrectly inserted or da-
maged.
1.4 Needle thickness does not suit to
that of thread or sewn material.
1.5 Hook point sticks the thread.
1.6 Needle thread excessively elastic.
1.7 Low quality thread.
1.8 Needle thickness unsuitable for the
hole in the throat plate insert.
1.9 Damaged throat plate insert.
1.10 Incorrect setting of opening bob-
bin case lifter (little opening).
2.1 Incorrect threading.
2.2 Damaged bobbin.
3.1 Short thread end in needle after
trimming (thread too tensioned in
the moment of trimming).
3.2 Excessive thread tension.
3.3 Upper thread not squeezed, at the
first needle piercing, between
sewn material and rear edge of pierc-
ing hole.
3.4 Upper thread incorrectly caught by
movable trimming knife. Lumps of
thread remaining in hook space.
Method of troubleshooting
Thread the upper thread according to NP,
par. 6.1.
Set the tension according to NP, par. 6.4.
Replace needle according to NP, par. 6.5.
Use a thicker needle.
Set distance between hook and needle
according to SK, par. 3.1.3 and 3.1.5.
Increase the hook timing and set the
needle bar height according to SK, par.
3.2.3.
Replace thread.
Replace insert.
Replace insert.
Set according to SK, par. 3.1.6.
Thread according to NP, par. 6.3.
Replace bobbin.
Thread upper thread according to NP,
par. 6.1. Reduce tension of pretension
unit according to NP, par. 6.4. Accelerate
slightly OFF position of main tensioner
according to SK, par. 4.9; NP, part B , par.
5.2.2, 5.3.2; Mini-stop, par. 5.2.5 - pa-
rameter 192.
Set thread tension according to NP, par.
6.4.
Set needle feeding in such a way, so that,
with the maximum stitch length, the nee-
dle almost touches the rear edge of throat
plate insert accordin to SK, par. 3.2.5.
Reduce height of wheel feeder accord-
ing to SK, par. 3.5.3.2.1.
Put nearer top roller to needle and shift
it rearwards according to SK, par. 3.6.6.2.
Set correctly hook opening according to
SK, par. 3.1.6 and adjust setting of trim-
ming cam according to SK, par. 4.3.
Operating instructions for eventual trouble shooting
Meaning of abbreviations:NP - Instruction manual
SK - Instructions for service
Note: When the machine is driven by a stop motor, it is indispensable to check up, before starting its repair, the setting of its
parameters according to NP, part B, par. 5.
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