HK 52/8 S
Hohner Maschinenbau GmbH
54
5 Faults
5.1 Causes and elimination of faults
Below you will find some examples of faults, with information on the potential cause. If various
causes come into consideration, sometimes several suggestions may be made for the remedy:
You should not follow all of these before testing the result, but proceed step by step, with
intermediate testing. Worn parts should always be replaced.
Stitch
Fault
Potential cause and elimination of the fault
Back of stitch is
bent in a banana
shape:
Back of stitch not
securely
positioned:
Stitch legs are not
sufficiently
clinched:
Back of stitch is
not securely
positioned and is
sagging in a
saddle shape:
Stitch legs are
buckled and are
not properly
clinched:
Wire not
penetrating,
resulting in loop
formation:
- Weak or soft wire.
- Wire not aligned, cf. 3.5.
- Circular or flat knife worn, cf. 4.2.4.
- Shoe tongue pressure too weak: remove
obstructing wire pieces or replace pressure spring
in shoe tongue.
- Wire groove in driver soiled, worn or damaged:
remove driver, cf. 4.2.3.
Clean driver groove or replace driver.
- Stitching not pressed sufficiently: set stitching unit
to stitch thickness.
- Stitching not pressed sufficiently: set stitching unit
to stitch thickness.
- Clincher is not coming up far enough: adjust
clincher lift pressure on stitching unit.
- Time from clincher activation to lift movement is
incorrect: stitching unit must be reset by the
manufacturer.
- Stitching not sufficiently pressed: set stitching unit
to stitch thickness.
- Weak or soft wire.
- Shoe tongue pressure too weak: remove
obstructing wire pieces or replace pressure spring
in shoe tongue.
- Weak or soft wire.
- Wire not aligned, cf. 3.5.
- Align clincher box, cf. 3.1.4.
- Different leg lengths, cf. 3.6.3.
- Overall wire piece too short, cf. 3.6.2.
- Circular or flat knife worn, cf. 4.2.4.
- Weak or soft wire.
- Bender groove blocked by wire pieces.
- Circular or flat knife worn, cf. 4.2.4.
- Wire groove in driver soiled, worn or damaged:
remove driver: clean driver groove or replace
driver, cf. 4.2.3.
- Shoe tongue pressure too weak: remove
obstructing pieces of wire or replace pressure
spring in shoe tongue.
- Align clincher box, cf. 3.1.4.
Содержание UNIVERSAL 52/8 S
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