30
5.7 Sharpening of knives
Together with the machine, knives of various shapes of sinte-
red carbides or of tool steel in accordance with the respective
table 3b, Instruction manual, par. 5 are supplied.
Knives of sintered carbides may be sharpened only in the
manufacturing factory.
Knives of steel can be sharpened using a jig, which is to be
ordered under the ordering number M 269.
5.7.1 Hand sharpening (stoning) of the knives
Only knives without any crambled cutting edge may be hand
stoned.
Caution!
Danger of insury by the knife cutting edge when
handling or stoning it.
- Clamp the knife into the jig (1) in such a way, so that the
cutting edge (2) is aligned with the side surface of the jig
(3), tighten the screw (4), then the screw (5).
- Place the jig (A) on the grinding stone (B) in such a way, so
that the cutting edge and both wheels lie thereon. Thereafter,
in moving forward and rearward, under a slight pressure,
stone the cutting edge of the knife.
5.7.2 Machine sharpening of the knives
For the machine sharpening, the same jig is to be used as for
the hand sharpening. Sharpening is to be done on any grinding
machine in parallel with the bottom side of the gig. Hereinafter,
sharpening on a flat horizontal grinding maschine with
magnetic clamping is described. Such grinding machine is a
normal outfit of many engineering plants or grinding shops.
Caution!
Danger of injury by the knife cutting edge when
handling or sharpening it.
- Clamp the knife into the jig (1) in such a way, so that the
cutting edge (2) is aligned with the side surface of the jig
(3), tighten the screw (4), then the screw (5).
- Clamp the jig (A) on the magnetic table of the grinding
machine (B) and sharpen the cutting edge,
- Sharpen the bevel of 1.2 mm; 45
°
according to the illustra-
tion.
When sharpening the knife, a sufficient cooling is
to be used, otherwise , excessive heating of the
sharpening edge and so the destruction of the
whole knife would occur.
6
.
Lifting the top roller by electromagnet
6.1 Description
The core of the electromagnet, respectively its pin must be set
in such a way that the presser foot lifting is enabled.
6.2 Setting the electromagnet pin
Caution! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Unscrew the cap of the core (1) of the electromagnet.
- Shift the core (2) with the pin (3) and loosen the locking
screw (4).
- By screwing the pin (3) in the core (2), set their mutual
position in such a way that the core is fully pushed in with
the maximum presser foot lift.
- Tighten the locking screw (4).
- Screw on the cap (1).
A
B
1
2
3
5
4
2
4
1
3
A B
45
°
1,2
