Hohner UNIVERSAL 43/6 S, Operating Instructions Manual

Page: 49 / 55

Servicing
Hohner Maschinenbau GmbH HK 43/6 S 49
4.2.4 Replacing the knife
- Fig. 31 -
- To replace the knife, move the knife box
a
completely away from the guide
c
by turning the
knurling wheel
b
and remove from the stitching head.
- Fig. 32 -
- Push the knife slider
e
out of the knife box
a
(arrow A)
Make sure that the pressure spring doesn’t strip.
- Change the knife (see following chapter)
- Fig. 34 -
- Replace knife slider
e
in the knife box
a
(arrow B), compressing the pressure spring of the knife
slider with a screwdriver, and pushing it into the knife box. Make sure that the pressure spring is
not bent.
- Fig. 31 -
- Place knife box
a
on the guide
c
.
- Attach flexible wire feed to drill hole
d
in knife box.
- Return knife box to the desired position by turning the knurling wheel.
4.2.4.1 Rotating/Changing the flat knife
- Fig. 33 -
The flat knife has 2 cutting edges. If the first cutting edge is blunt, the knife can be rotated.
- Unscrew fastening screw
i
.
- Rotate or replace flat knife
h
and tighten fastening screw
i
.
4.2.4.2 Replacing the circular knife
- Fig. 33 -
- Loosen the clamping screw
f
and remove the circular knife
g
.
- Press new circular knife completely into the seat in the knife box.
- Adjust circular knife (cf. Adjusting the circular knife).
4.2.4.3 Adjusting the circular knife
- Fig. 35 -
The circular knife is adjusted so as to ensure clean cutting of the wire.
When the knives are mounted, set the clearance between the flat and circular knives by carefully
“levering” with a screwdriver.
- Loosen clamping screw
f and position circular knife g exactly against the flat knife by "levering"
with a screwdriver.
- Tighten clamping screw f .
If the distance between the knives is set too close the knife slider 5 may block and cause a wire
jam.