Improvements in Flour-shaking Machines.
Year: 1886

page_text: Date of Application, 26th July, 1886
Complete Left, 13th Jan., 1887.
Complete Accepted, 15th Feb., 1887.
Improvements in Flour-shaking Machines.
We EMIL WEISS, Manager and LOUIS FRAENKEL, Merchant, both of Cuvrystr. 64,
Berlin, in the Kingdom of Prussia, German Empire, do hereby declare the nature of
our invention for IMPROVEMENTS IN FLOUR-SHAKING MACHINES to be as follows:-
Our invention in flour-shaking machines consists in the arrangement of shaking-
sieves which are closed at the upper side by an elastic cloth.
By this closing the upper part of the shaking sieve all the evils are avoided which
accompany as well the ordinary rotating bolting mills as the common shaking sieves
without the upper cloth.
By the cloth the injurious motion and friction of the flour as in the common shaking
sieves is obviated, and the flour is lifted off by alternately generating an increased or
diminished pressure of air in the sieve case which pressure of air either presses the
flour on the sieve or lifts it off it. The contrivance with which we attain this object
is a sieve-frame open on one side and covered with an elastic cloth. The shaking
motion of this sieve-frame in the closed body of the machine produces a motion of
the air which in its turn calls forth undulating motions in the elastic cloth. By this
means the pressure of air is made serviceable for the whole surface of the sieve and
operates uniformly on it.
The result is that a gritty flour, free of all lighter particles is obtained, whereas
in the sifting machines known as yet, no such separation is effected. Even when the
flour runs into the upper sieve space the light particles of dirt or flour are kept from
setting on the sieve-bottom by the motion of the air prevailing in the space and are
conducted towards the discharge-hole. As the bran and light particles of flour are
prevented from setting on the upper sieve and are forced towards the outlet for them
the flour is already clear when it falls on the second sieve and merely requires to be
sorted then.
Both sieves are bound with another and are moved together and by this movement
of both sieves the air-current is generated which clears the material without using
a special wind-motor.
The outward case of the machine may also be of an elastic cloth; this will increase
the effect of lifting the material on the sieves.

page_text: We, EMIL WEISS, Miller, and LOUIS FRANKEL, Merchant, both of 64, Cuvrystrasse,
Berlin, in the Kingdom of Prussia, German Empire 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 :-
Our invention in flour-shaking machines consists in the arrangement of shaking
sieves, which are closed at the upper side by an elastic cloth. By this closing of the
upper part of the shaking-sieve all the evils are avoided which accompany as well the
ordinary rotating bolting mills as the common shaking sieves without the upper cloth.
By the cloth the injurious motion and friction of the flour as in the common shaking
sieves is obviated, and the flour is lifted off by alternately generating an increased or
diminished pressure of air in the sieve case, which pressure of air either presses the
flour on the sieve or lifts it off it. The contrivance with which we attain this object is
a sieve frame open on the one side and covered with an elastic cloth. The shaking
motion of this sieve frame in the closed body of the machine produces a motion of the
air which in its turn calls forth undulating motions in the elastic cloth. By this means
the pressure of air is made serviceable for the whole surface of the sieve and operates
uniformly on it. The result is that a gritty flour free of all lighter particles is
obtained, whereas in the sifting machines known as yet no such operation is effected.
Even when the flour runs into the upper sieve space the light particles of dirt or flour
are kept from setting on the sieve-bottom by the motion of the air prevailing in the
space and are conducted towards the discharge hole. As the bran and light particles
of flour are prevented from setting on the upper sieve and are forced towards the out-
let for them the flour is already clear when it falls on the second sievo and merely
requires to be sorted then. Both sieves are bound with another and are moved
together and by this movement of both sieves the air-current is generated which
clears the material without using a special wind-motor. The outward-case of the
machine may also be of an elastic cover; this will increase the effect of lifting the
material on the sieves.
Fig. I shows a vertical section through the machine, fig. II is a section through the
line ab of fig. I, fig. III shows a view of the frame t.
The construction of the machine is as follows:
i is a funnel divided by ribs (fig. 2) through which the flour is emptied into the
apparatus and distributed over the surface of sieve s. The funnel is connected air-
tight with the frame of the shaking-sieve by means of the elastic cover d. t is the
shaking sieve-frame, s s¹ are the sieves provided with the different sieve-numbers; sieve-
frame t has the two openings o o and rests on spring ; it is moved to and fro by the
fly-wheel a and rod y. h, h² are the collecting funnels for the different products:
flour, pure mill dust, clear fine grits and so on. The bran leaves the machine at h³.
The effect produced by this shaking sieve-frame open on one side (as indicated in
fig. 1 at o,) is clear and evident. If the sieve frame, consisting in the elastic cover d
and the two sieve-surfaces & moves to the right, as shown in fig. 1, the air contained
S

page_text: in the outer space n of the apparatus is dislodged on the right side and compressed,
whereas on the left at the open place o of the sieve-frame and between cover d and
sieves the air is rarefied, so that the cover consequently is pressed in the space m.
By this means the flour is firmly pressed on the sieve s. If the notion of the sieve-
frame takes place in the opposite direction a rarefaction of the air contained in the
outer space n of the machine is effected, the cover d is lifted upwards and the flour,
which in consequence of the slanting position of sieves is continually kept in motion,
is then lifted off the sieve, loosened, shaken up and falls then back on the sieve at
another place. The elastic cover d prevents this increase and decrease of pressure from
acting as a horizontal current of air in the space. It obviates this by dividing the
whole space m into small spaces, in one of which there is for a time a decrease of
pressure while in the adjoining spaces of m an increase prevails. All these changes
in the pressure correspond with the undulating motions of the cover d and are produced
by it. When working, the cover d has the appearance of water, the surface of which
is moved by the wind.
The effect produced by this combination of the shaking-sieves s s with the elastic
cover d and the sieve-frame t open on one side, is not limited to a continuous loosening
or shaking up of the flour or to preventing the sieve from getting obstructed, but it
also separates the particles of starch from the flour and carries them off in a peculiar
way. These particles of starch are collected on the elastic cover d; they are partly
driven on to it by the constantly prevailing current of air, entering through o, and
partly pressed through this same elastic cover d. These very fine particles of starch
are thus separated from the flour.
The effect of this current of air can be increased, made more uniform and be better
distributed by providing the outward case also with an elastic cover por elastic side
covers w (fig. 2). Variations in the effect of the cover will be fully equalised by this
arrangement.
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 :
In flour shaking machines and machines for similar purposes:
1.) The application of a shaking sieve-frame open on one side and provided with an
elastic cover in order to separate the different products as gritty flour, mill dust, fine
grits and so on, free of bran and dirt, by means of the air current produced in the
inner space m of the sieve-frame.
2.) The shaking sieve-frame open on one side and provided with an elastic cover d
in combination with an outward case n, also provided with an elastic cover p or elastic
side covers w w for the purpose of generating suction and pressure-wind and in order
to double the effect mentioned in claim one.
A. KUHNT R. DEISSLER,
38, Alexanderstr., Berlin, C., Germany,
Attorneys.