Improved Method of Sifting and Apparatus therefor.
Year: 1891

page_text: Date of Application, 16th Mar., 1191
Complete Specification Loft, 20th Nov., 1191-center, 23-1 Jan., 1892
PROVISIONAL SPECIFICATION.
Improved Method of Sifting and Apparatus therefor.
-
i
1, HEINE
Kingdom of
Saxony Empire of Germany, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved method of sifting flour, meal or other
pulverous substances and to apparatus therefor.
In carrying the said invention into practice the flour, ingal or other substance is
introduced between two parallel or substantially parallel sifting surfaces or between
a sifting surface and a solid wall or impervious surface to both of which or in some
in-tances to one of which is imparted a cortinuous swinging or gyrating movement
corresponding to a succession of full circles or other curved lines, the planes of
which will be perpendicular or retangular to the plane of the said surfaces the
movement being applied in such a manner that each point of the said surface or
surfaces will have the same extent of movement.
By reason of this direction of movement the said flour, meal or other substance
moving in such circular or curved path or direction will in a vertical sense, be
thrown against the sifting surfaces or surface and will thus at regular intervals be
brought into contact with projections or ribs arranged at certain distances on the
inner side of one of the surfaces moved in such circular or curved path or
direction.
The said projection or ribs are so arranged that the flour, meal, or other substance,
when striking them in the direction towards the inlet end of the apparatu, will be
kept from following further the movement of the surfaces in that direction but,
when subsequently dropping from the said projections will strike the opposite
surface at a point further removed from the inlet end. In this manner the said
flour meal or other substance will, in being thrown from one of the opposite surfaces
to the other, gradually move onward between the same and being, by reason of the
speed and uniformity of the movement thrown against the sifting surfaces or
surface with great force or impetus and every particle of the flour, meal or other
substance coming into intimate and repeated contact with the sifting surfaces it
will be thoroughly and more effectually sifted than has been possible with the
rocking sieves heretofore usually employed.
The sifting surfaces arranged as above described are surrounded by a suitable
casing provided with inlet, and outlet openings and connected with means for
imparting to it a gyrating or rotary movement so that every point of the sifting
surfaces or surface will move in circles or curved lines of uniforin size the planes of
which will be vertical to the said surfaces.
1 d f 1901
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant,

page_text: Improved Method of Sifting and Apparatus therefor.
1, HEINRICH SECK, of No. 15 Leubnitzer Strasse Dresden, 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 ascertained in and by the
following statement :-
This invention relates to an improved method of sifting flour, meal or other
pulverons substances and to apparatus therefor.
The object of my invention is to provide for thoroughly agitating and shaking up
such flour meal or other substance in being sifted, so as to bring every particle
thereof into intimate and repeated contact with the sifting surfaces of the apparatus
in passing through the latter.
The improved method forming part of my invention consists in introducing the
flour, meal or other substances between two parallel or substantially parallel sifting
surfaces or between a sifting surface and a solid wall or impervious surface and
causing it to pass with a positive movement between the said surfaces in such a
manner as to be in a vertical sense thrown against the sifting surface or surfaces, by
giving the opposite sifting surfaces a line of movement corresponding to a succession
of full circles or other curved lines and having a direction perpendicular or
rectangular to the plane of the sifting surface or surfaces by reason of which move-
ment the flour meal or other substance moving in such circular or curved line or
direction will at regular invervals, be brought into contact with projections or ribs
arranged at certain distances from each other on the inner side of one of the
sifting surfaces moved in such circular or curved line or direction.
The improved apparatus forming the other part of my invention and intended
to be used for carrying out my improved method will be more particularly
described hereinafter with reference to the accompanying drawings in which
Figure is a vertical longitudinal section of a sifting apparatus embodying my
invention and here shown as being arranged in an inclined position.
Figure 2 is a vertical longitudinal section on the line
similar apparatus arranged in a vertical position.
of Figure 3 showing a
Figure 3 is a vertical section on the line y y of Figure 2, and
Figure 4 is a detail showing a modified form of the sifting surfaces.
te designates a crank shaft having a driving pulley B and journalled in suitable
bearings on the frame. A designates a casing mounted loosely on the said crank-
shaft and having crank pins e e' likewise journalled in suitable bearings arranged
on the frame. The said casing or sifting apparatus proper A is provided within
with two parallel sifting surfaces a and bone of them (a) having a number of
projections or ribs e directed inwardly. is an inlet opening for admitting the
Hour, meal or other substance to be sifted which enters the casing A at and is
introduced between the two sifting surfaces a and b from below, the latter
being, by reason of the motion transmitted to the casing A from the shaft o
and pulley B gyrated or swung in a circle, thereby causing the flour, meal or
other substance to be agitated between the said sifting surfaces and thrown to
and fro from one surface to the other and against the sifting surfaces and to
be, at the same time moved slowly towards the delivery end of the casing
although by reason of the direction of movement of the gyrating casing in the
arrangement as shown in Figure 1, it will be continually thrown back again in
the direction towards the inlet end.
It is by reason of this direction of movement, however, that the desired result
is obtained when the sifting surfaces are arranged in an inclined or horizontal
position, as the flour, meal or other substance to be sifted would, if the easing were
gyrated in the opposite direction, be thrown in a moment through the entire length

page_text: of the space between the two surfaces without becoming thoroughly sifted in
passing.
The manner in which the flour or other substance to be sifted is moved onward in
passing between the sifting surfaces may be briefly explained as follows:-
We will suppose that a certain quantity of four had been introduced at into
the space between the walls a and b. Now, when the casing is moved in the
direction of the arrow, or in other words, when it at first moves in a downward
direction, the flour, by reason of inertia. will have a tendency to reoccupy its
previous position, that is to say, it will move upward and adhere to the surface .
As the rasing now continues its gyrating movement and thereby moves to the right
the substance to be sifted will be removed from the wall and be caught by the
projections or ribs on the wall a being, during the upward movement of the casing A,
held on the said wall a and prevented from dropping down therefrom through
the said projections or ribs ; it will then be carried upward with the
casing and during and in consequence of the subsequent movement of the latter to
the left, the said substance will again be thrown against the surface to the right
striking the same, however, on a higher point thereof where it will then again
adhere while the casing now again moves in a downward direction, and so on.
It
By reason of the high speed and the uniformity of the gyrating movement of the
casing the flour, meal or other substance therein will in the direction of circles or
regular curves, be thrown into the spaces between each two projections or ribs which
will then in turn throw the said substances to be sifted against the opposite
sifting surface b, thereby causing it to gradually move in an upward direction.
is evident that this movement will cause the said substances to become thoroughly
agitated and, by being thus thrown against the sifting surface or surfaces with
great force or impetus, to be sifted in a much more effectual manner than has been
possible with the rocking sieves heretofore usually employed.
Instead of having projections or ribs the sides inay also be formed with a number
of projecting angles and corresponding recesses as shown in detail in Figure 4; also,
instead of one, both surfaces may be provided with the said projections, ribs, angles
or recesses. Moreover, instead of both surfaces moving in the manner as described,
one of them may remain stationary while the other is moved.
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 :-
First. The method, substantially as herein before described, of sifting flour, meal
or other substances, said method consisting in introducing the said substances
between two sifting surfaces, or between a sifting surface and an impervious wall or
surface, one of which surfaces, or both, is or are, given a gyrating movement in such
a manner as to cause all points of the said surface or surfaces to move in circles or
curves of uniform size the planes of which circles or curves will be perpendicular or
rectangular to the sifting surface or surfaces, the said flour, meal or other substance,
while being thus moved, coming into contact with a number of resistance (projec-
tions, ribs, angles or recesses) and being thus given a positive movement towards
the discharge opening of the sifting apparatus and being at the same time con-
tinuously shaken up by being thrown, in a vertical sense, tangentially against the
sifting surface or surfaces.
Second. A sifting apparatus for sifting flour, meal and other pulverous substances,
having two parallel or approximately parallel sifting surfaces given a gyrating
movement as described in such a manner as to cause every point thereof to move in
circles or curved lines of uniform size, the planes of which will be vertical to the
said surfaces one of which is provided with projections as described for giving
the flour, meal or other substances a positive movement towards the outlet opening
of the said apparatus and for, at the same time continuously agitating the same and
throwing them in a tangentially vertical direction against the sifting surfaces as
described.

page_text: Third. A sifting apparatus for flour, meal and other pulverous substances having
two surfaces arranged the one opposite to the other one of them forming a sifting
surface as described and either the one or the other surface being provided with
projections arranged transversely to the direction of movement at a certain distance
from the opposite surface, and means for giving one or both surfaces a gyrating
movement so that every point of the said surface or surfaces will move in circles
or curved lines of uniform size the planes of which will be vertical to the said
surfaces as described.
Fourth. A sifting apparatus having two sifting surfaces one of them being
provided with transverse ribs or projections as described, the said sifting surfaces
having a curved or circular shifting movement imparted to them on a plane common
to both surfaces, the said movement being such as to cause the material introduced
between the surfaces to be sifted by the alternate action of the one and the
other sifting surfaces and to be at the same time moved forward, the speed of the
movement imparted to the surfaces being such as to cause the effect of the impulses
thereby imparted to the material to overcome the effect of gravity upon the
material.
Dalho
famba. 1001
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.