A Horizontal Sifting Machine with Circular Shaped Sieves.
Year: 1894

page_text: Date of Application, 1st Mar., 1894-Accepted, 1st Mar., 1895
COMPLETE SPECIFICATION.
A Horizontal Sifting Machine with Circular Shaped Sieves.
I, WILHELM BUNGE, Miller of Stadtische, Mühle, Mühlendamm, Lubeck in
the Empire of Germany, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
The object of the present invention is a horizontal sifting machine with circular
shaped sieves which may be easily taken apart from one another for the purpose
of cleaning and altering the shape and number of sieves according to the goods or
material to be sifted all this being of great importance for perfecting the operation
of milling.
This horizontal sifting machine is represented in the annexed drawings in
which
Fig. 1 is a section of the sifting machine.
Fig. 2 a top view of the same partly in section.
The present system of sifting by hand is perfect as regards result; but the
object of my present invention is to secure a similarly perfect result by mechanical
means instead of hand labour.
As the hands of the worker holding a sieve are moved the bottom of the sieve
loses the horizontal position and works upwards and downwards and from right to
left and so on thereby the material contained in the sieve and undergoing sifting
works on a spiral line from the edges of the sieve bottom to the middle of the same
and this is of great advantage in the sifting process.
The newly invented machine produces an effect exactly similar to that resulting
from the movement of the hands.
A, B, C, D, are the sieves (see Figure 1), each sieve being totally independent
of the others and easily removable.
a are the outer walls of the sieves, preferably made of wood.
a' are the inner walls.
6 the posts between which the sieves are placed one above the other.
The sieves are provided with flannel lining and afterwards pressed together air
tight by a screw-like mechanism c.
d is a shoot through which the machine is fed.
e are cone-shaped surfaces of sheet iron, fastened to the walls of the sieves.
ff are discharging tubes for the coarser and for the finer parts of the material
being sifted.
² are moveable iron shafts on which the apparatus is hung.
is a crank and a crank shaft through which motion is imparted to the
machine.
kare arms provided with brushes fastened to a ring made of angular shaped iron;
the interior width of this ring is a little greater than the outer width of the inner
walls of the sieves C and D.
The ring is supported by four flat iron pieces, fastened to the inner walls of the
sieves.
The material being sifted is fed into the apparatus by the shoot d on to the first
cone shaped surface e and glides over the edges of the latter into the first sieve
and from there the coarser parts pass into the first discharging tube / and thence
out of the apparatus.
The lighter parts fall onto the next cone shaped plate, pass over the edges of
the same and so on, as before described.!

page_text: The coarser parts on the second sieve, pass out of the apparatus, at fl, and so
on, with the other sieves-the finest parts ultimately issuing at f from the
apparatus.
The movement of the material undergoing sifting is effected slowly in a spiral
direction from the walls of the sieves to the middle thereof. By the rotation of
the arms provided with brushes and fastened in such a manner as to clean the
underside of the sieve, the latter is always kept clean and the perforations in
the sieve can never be totally stopped up. In this way, perfect sifting is effected.
The different sieves, being placed one upon the other, may be easily taken apart
and, therefore, a perfect cleaning of the sieves is possible; besides, by adding
more sieves, the sifting process may be further perfected.
If less sifting be required, the number of sieves may be reduced.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In a sifting apparatus, a number of circular sieves, connected together, and
put in rotary motion on a horizontal plane, so that the material fed by the shoot
falls on to cone shaped surfaces placed above each sieve and glides from there
over the edges into the sieves where it is evenly spread over the sifting bottom,
the coarser particles of the material thereby agglomerating automatically in the
middle of the sieve and being removed thence from the machine by discharging
tubes, while the finer part passes through the remaining sieves and falls to the
ground, while rotating arms provided with brushes are fastened to the inner walls
of the sieves in such a manner as to keep clean the under surface of the sieve or
sieves and so prevent the perforations from being stopped up, constructed and
arranged, substantially as hereinbefore described.
Dated this 1st day of March 1894.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.