An Improved Sifting or Dressing Machine.
Year: 1893

page_text: Date of Application, 1st Aug., 1893-Accepted, 23rd Dec., 1893
COMPLETE DI ECIFICATION.
An Improved Sifting or Dressing Machine.
We, FRIEDRICH GUTJAHR, ALEXIUS MULLER, Manufacturers and JAKOB
SODER, Engineer, all of Buda-Pest, in the Empire of Austria-Hungary, 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:-
The present invention relates to a sifting or dressing machine in which the
material to be sifted or dressed is passed in zig-zag lines over the sifting surfaces,.
which is effected through an oscillating motion imparted to the latter.
Our invention is illustrated in the accompanying drawing, in which
Figure 1 is a vertical axial section of the sifting or dressing machine.
Figure 2 is a horizontal section or plan of the same, and
Figures 3 and 4 are respectively a section and a plan of parts of a device for
clearing the sieves.
According to our invention a vertical oscillating shaft a is provided with a
number of partitions b, so as to divide the space contained between the outer
casing c and inner ring d into several compartments, each adapted to receive inclined
floors or conducting surfaces and gl, sieves f and f³ and covers e.
I
This particular construction of machine allows of several sorts of mill produce to-
be sifted simultaneously, according to the number of compartments, which, for that
purpose, are each provided with a separate hopper B. If the machine is required
to sift only one sort of mill produce, the latter may be introduced through the
feed pipe A on to spreader h, from which it is distributed into the hoppers B leading
to the sieves.
The drawing illustrates two different methods of sifting, viz., the method indicated
on the left side of the drawing is an arrangement in which the coarser particles of
the goods are carried along the surfaces of the sieves, while the finer particles fall
as ready dressed goods into the outlets i. The method indicated on the right side
is an arrangement in which the coarser particles become separated at the uppermost
sieve and drop into the outlets i while the finer particles of the goods are carried
over the lower sieves.
The machine receives its oscillatory movement from a crank shaft l, as shown in.
Figures 1 and 2, the cranks being set at 180° with each other. The shaft a is
traversed near its lower extremity by a cross bar n connected by means of ball
joints to the connecting rods m provided with adjustable heads 8. The crank
shaft is supported in bearings k, and it is provided with fast and loose pulleyst and
fly wheel q.
In consequence of the oscillatory movement of the machine, each individual point
of the surface of the sieves describes an arc of à circle. The centrifugal force
resulting thereform throws the various particles of the mill produce outward in an
inclined direction, while the inclined sifting surfaces f¹ tend to drive the goods
towards the centre of the apparatus, the combined result of which is a slow zig-zag
movement of the goods over the sifting surfaces f¹ towards the axis of the
machine.
The slow movement imparted to the goods over the sifting surfaces greatly
enhances the efficiency of the machine.
The sifting surfaces are arranged horizontally so as to deliver the particles
always at the outer periphery of the sifting surfaces f'.
The goods, in passing over the said horizontal sifting surfaces f, gradually, under
the influence of the oscillating movement of the machine, move in a zig-zag course

page_text: away from the centre and towards the periphery of the machine. The movement,
being slow and graduated, gives the machine great efficiency.
The floors or conducting surfaces g and glare, like the sifting surfaces f', inclined
towards the centre of the machine so as to deliver the dressed goods at the centre,
and the said goods, in consequence of their slow zig-zag movement over the
surfaces 9 g', have an opportunity of thoroughly mixing together.
The device for clearing the sieves, consists of movable rods w loosely inserted in
supports win close proximity with the sieves, either above or below, so that, in
the motion of the machine, they shall strike and shake the sieves and thereby clear
the same.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare, that what we
claim is :
1. In a sifting or dressing machine, the combination of hoppers B to receive the
mill produce or material to be sifted or dressed, horizontal sieves f receiving the
material from the hoppers B at their inner edges and delivering it at their outer
edges or peripheries, inclined sieves receiving the material at their outer edges
or peripheries, and delivering it at their inner edges, and inclined floors or con-
ducting surfaces 9 9' receiving the material at their outer edges or peripheries and
delivering it at their inner edges, the whole having an oscillatory motion for the
purpose of causing the mill produce to pass slowly and gradually in zig-zag lines
over the said surfaces ff' g g', substantially as herein shown and described.
2. In sifting or dressing machines, the combination with horizontal sieves f
inclined sieves f¹, and inclined floors or conducting surfaces g g', of separate and
independent hoppers B and compartments for the convenience of sifting or dressing
several kinds of goods simultaneously, substantially as herein shown and described.
3. In sifting or dressing machines, the combination with horizontal sieves f,
inclined sieves f¹, and inclined floors or conducting surfaces g g', of a device for
clearing the sieves consisting of movable rods loosely inserted in proximity with the
sieves so as to shake the sieves during the running of the machine, substantially as
herein shown and described.
Dated
2008
FRIEDRICH GUTJAHR,
ALEXIUS MULLER,
JAKOB SODER,
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.