Improvements in the Knife or Fly-wheel of Chaff-cutting and similar Machines.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in the Knife or Fly-wheel of Chaff-cutting and similar
Machines.
1, FERDINAND WIESE, of Glücksburg, near Flensburg, in the Kingdom of Prussia
and German Empire, Farmer, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
This invention relates to fly wheels for chaff cutting and similar machines in which
the two knives attached to the machine are arranged in such a manner, that their
edges form parts of the periphery of an ellipse, the intersecting point of the axes of
which is the centre of the fly wheel, the small half-axis y being equal to the distance
between the centre of the fly wheel and the inner edge of the material to be cut, and
the larger half-axis being equal to the distance between the centre of the fly wheel
and the outer edge of the material to be cut.
Referring to the accompanying drawings which illustrate my invention,
Figure 1 is a front view of my improved fly-wheel.
Figure 2 is a sectional view of the same.
All chaff cutting machines hitherto used have had the disadvantage, that the
knives have to cut the material largely by pressure only, without any sufficient sliding
motion upon it.
The peculiarity of my improved arrangement of knives is that during the whole
cut, while the knife is advancing into the material, its sliding motion upon it is con-
tinually maintained. This sliding motion is greatest at the commencement of the cut
and the knife then advances into the material least.
To the arms a of the fly wheel b, are attached the knives c by means of screws d.
The headed screws serve for the accurate attachment of the knives. fare the tubes
in which the straw or other material to be cut is slowly advanced. g is the hand
crank for the rotation of the fly wheel.
The advance of the knife across the opening of the tube is almost tangential, see
figure 1 right hand side and without any push whilst the exit is also nearly
tangential without any push, so that the commencement and end of the cutting
operation are very quiet.

page_text: In order to obtain this, the edges of the knife c¹ form parts of an ellipse, the
centre of which is also the centre of the fly wheel, and the two half-axes y and z
of which are equal to the distances between the centre and the utmost inner and
outer edges respectively of the material to be cut.
The peculiarity of this machine, resulting from the elliptical form of the knives
is, as before mentioned, that the advance into and exit from the material are effected
quietly and without any push, which has not yet been obtained by any other form.
A further advantage in consequence of the whole machine working more quietly is
that smaller knives may be chosen.
I use preferably rectangular tubes as shown in the drawing.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is
A knife or fly wheel for chaff-cutting and other machines in which the two knives
attached to the machine are arranged in such a manner that their edges form parts
of the periphery of an ellipse the intersecting point of the axes of which is the centre
of the fly-wheel, and the smaller half-axis y is equal to the distance between the centre of
the knife or fly-wheel and the inner edge of the material to be cut, the larger
half-axis being equal to the distance between the centre of the knife or fly-wheel
and the outer edge of the material to be cut.
2
Dated 20th February 1889.
FELL & WILDING,
1, Queen Victoria Street, London, E.C.,
Agents for the Applicant.