Bedienungsanleitung Durkopp Adler 4280i - 6 (Seite 19 von 35) (Englisch)

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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.

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 Incorrect side setting of throat pla-

te post or needle bed shifting - little

gap between needle and piercing

hole edge from hook side.

1.7 Rear needle guide in an excessive

back position - the right upper

thread is being slid on it.

1.8 Needle thread excessively elastic.

1.9 Low quality thread.

1.10 Needle thickness unsuitable for the

hole in the throat plate insert.

1.11 Damaged throat plate insert.

1.12 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

piercing hole.

Method of troubleshooting

Thread the upper thread according to NP,

par. 6.1.

Set the tension according to NP, par. 6.3.

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.

Set according to SK, par. 3.3.2.

Correct distance between needle and

hook according to SK par. 3.1.3.

Set rear needle guide, so that its front

edge fits with the rear edge of the right

piercing hole.

Increase the hook timing and set the nee-

dle bar height according to SK, par. 3.2.3.

Replace thread.

Replace insert.

Set according to SK, par. 3.1.6.

Thread according to NP, par. 6.2.

Replace bobbin.

Thread upper thread according to NP,

par. 6.1. Reduce tension of pretension

unit according to NP, par. 6.3. Accelerate

slightly OFF position of main tensioner

according to SK, par. 4.8; NP, part B, par.

5.2.2, 5.3.2; Mini-stop, par. 5.2.5 - para-

meter 192.

Set thread tension according to NP, par. 6.3.

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. 3.6.3.2.1.

Put nearer top roller to needle and shift it

rearwards according to SK, par. 3.7.6.2.

Reduce rear guide, so that it touches

slightly sewn material with lowered top

roller.

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Durkopp Adler 4280i - 6 Seite 19

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