Faults; Causes And Elimination Of Faults - Hohner UNIVERSAL 52/8 S Operating Instructions, Spare Parts List, Special Staples, Options

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
54
Fault Potential cause and elimination of the fault
Back of stitch is - Weak or soft wire.
bent in a banana - Wire not aligned, cf. 3.5.
shape: - 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.
Back of stitch not - Stitching not pressed sufficiently: set stitching unit
securely to stitch thickness.
positioned:
Stitch legs are not - Stitching not pressed sufficiently: set stitching unit
sufficiently to stitch thickness.
clinched: - 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.
Back of stitch is - Stitching not sufficiently pressed: set stitching unit
not securely to stitch thickness.
positioned and is - Weak or soft wire.
sagging in a
- Shoe tongue pressure too weak: remove
saddle shape: obstructing wire pieces or replace pressure spring
in shoe tongue.
Stitch legs are - Weak or soft wire.
buckled and are - Wire not aligned, cf. 3.5.
not properly - Align clincher box, cf. 3.1.4.
clinched:
- 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.
Wire not - Weak or soft wire.
penetrating, - Bender groove blocked by wire pieces.
resulting in loop - Circular or flat knife worn, cf. 4.2.4.
formation: - 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.
HK 52/8 S Hohner Maschinenbau GmbH