New or Improved Machinery for Sifting Flour and Sorting Grain.
Year: 1896

page_text: Date of Application, 1st May, 1896-Accepted, 6th June, 1896
COMPLETE SPECIFICATION.
New or Improved Machinery for Sifting Flour and Sorting Grain.
I, EDWARD TRUMMER, of Prentlhof Radkersburg, in the Empire of Austria,
Mill-owner, 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 a sifting machine in which important practical advantages
are obtained by improvements in the hanging and arrangement of the sieves, in the
devices for feeding in the material to be sifted, and in apparatus for keeping the
sieves clear.
The invention is illustrated in the accompanying three sheets of drawings in
which
Figure 1 is a longitudinal section of a sifting machine constructed in accordance
with the invention,
Figure 2 is a longitudinal section, drawn to a larger scale, of one of the spaces
through which the sifted material falls to the outlet,
Figure 3 is a cross section of the machine,
Figure 4 shows the driving gear,
Figure 5 shows the method of fixing the sieve supporting springs to the
framework, Figure 6 a detail of same,
Figure 7 shows the arrangement of the guiding and striking bars,
Figure 8 is a longitudinal section taken on the line -x of Figure 7,
Figure 9 is a horizontal section taken on the line y-y of Figure 8,
Figure 10 shows a vertical section of a zigzag arrangement of the sieves,
Figure 11 a plan of a modification of the cleaning or clearing apparatus,
Figure 12 a section taken on line z-z of Figure 11 and
Figure 13 a vertical section taken on the line -w of Figure 11.
The sieves a (Figures 1 to 3) are stretched on frames, which are divided into
several sections each of which can, if required, be covered with different gauges of
gauze. These frames are connected with supporting springs (Figure 4) which
are hung to the longitudinal bars of a framework in the following way :-On the
longitudinal bars i are pivotted cross shafts k (Figure 5) which are provided with
eyes 1 (Figure 6) through which the supporting springs are passed, and in which
they are secured by screw nuts m, so that by axial adjustment of the shafts the
sieves can be easily brought into the correct position to suit the driving apparatus,
and the height of the sieves can be regulated by screwing the supporting springs
up or down by means of the nuts m. The sieve frames hanging to the supporting
springs are set in motion by means of eccentrics or cranks (Figure 4) secured on
a shaft g which runs from end to end of the machine. Below the sieves a are
placed rollers the axes of which run longitudinally of the machine, and turn
lousely in bearings c, (Figure 2), which are so fixed to the boards d which form
the outlet chamber that the rollers stand parallel to the inclined sieves, from
which they are distant only about one millimetre. Over the sieves are pivotted
the striking bars e which reach to the sieves. When the driving shaft, crank or
eccentric sieves and frames are set in rapid motion the grain is thrown left and
right against the striking bars e, whilst the downward inclination of the sieve frame
effects a movement of the grain towards the outlet, at the same time effecting a
sorting into each outlet chamber according to the size of the meshes of the part of

page_text: the sieve over the said outlet chamber. The rollers 6 below the sieve remain at
rest, and strip off any material that may remain hanging down in the meshes of the
sieve, keeping the latter clean in consequence of the reciprocating motion of the
sieves close over the said rollers.
Figures 7 to 9 show a reciprocating plain sieve, and a combination of this sieve
with a peculiar preparatory separator. The sieve gauze a is carried by frames n.
Over the gauze are arranged bars o perpendicular to the direction of reciprocation
of the sieve. The distribution of the grain or other substance to be sifted is effected
.by means of a hopper p in which are side openings q. From these openings the
grain falls on to an angle piece r, the vertical wall of which is provided with
notches & placed at distances apart which correspond to the distances apart of the
bars o which form sieve channels. The grain to be sifted is uniformly distributed
by the angle piece r and falls in equal.streams into the sieve channels in which it
is thrown to and fro, and may fall from the end of each channel into another one
.connected with it.
In Figure 10 is shown another arrangement of the sieves by means of which the
best possible utilization of space, and the finest gradation of the grain can be
attained. The charging takes place at the inlet t, whence the grain or other
substance.to be sifted or sorted is delivered on to a preparatory sieve A covered
with suitable wire gauze, which is coarse enough to allow groats, vapour and meal
to pass through whilst what will not pass through passes out, at the outlet u.
The material that passes through the preparatory sieve A falls on to a frame v
which may be covered with sheet metal or other impervious material, and is so
inclined that the siftings on it.pass down and fall on to the upper end of a second
sieve W which meets the preparatory sieve A at an acute angle. This sieve A is
divided into four sections which if required can be covered with ganze of various
sizes of mesh. The material passing through these divisions falls on to special
frames or boards B which lead to separate outlet spouts 1, 2, 3, 4, from whence the
finished sifted material can pass into sacks placed to receive it.
The
At the lower end of sieve W is placed at an acute angle thereto a third sieve C
which is likewise divided into sections like the sieve W and below which are
arranged frames D which lead to separate outlet spouts 5, 6, 7 and 8.
material passing through the sieve C falls on to a fourth-sieve E, which is prepared
in a manner similar to the sieves W and C, and leads by means of the frames or
boards F to the separate outlets 9, 10, 11 and 12. The material that does not
pass throngh this sieve E is led on to a fifth sieve Gibelow which are arranged
frames or boards H which lead to the outlets 13, 14, 15 and 16.
The remainder of the material to be sifted falls at last on to a sieve J, below
which are placed the outlets 17, 18, 19 and 20 and whatever will not pass through
this sieve passes out by the outlet 21.
According to the-size of the apparatus the zigzag passage formed by the
sieves W., C, E, Gand J can be varied as required by increasing or decreasing
the number of the sieves. The character of the gauze or other covering, and the
-division of each of the sieves may be arranged according to requirements.
Another kind of cleaning or clearing apparatus whereby considerable wear and
tear of the gauze or other covering of the sieve may be obviated is shown in
Figures.11 to 13. In this case fans are arranged below the sieves in such manner
that they are caused.to reciprocate by the movement of the sieves, and they strip
roff any material adhering to the anderside of the. gauze or other sifting medium,
as their upper parts, which are made of flannel, come in contact with the sieves,
rand remove anything that may remain. hanging therefrom.
The bara. K fixed.to the machine.carry longitudinal bars L on which the fans
are fixed. These fans cousist of double bars M which are fixed at uniform
distances apart on the longitudinal bars L, and between. which are arranged
stripping, flaps N. These stripping flaps are strengthened with leather strips
and wooden bars-P in order to make them elastic and springy.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
First. A flour sifting and corn sorting machine having variously meshed sieves a,
reciprocated by eccentrics or cranks, and hung in a framework by supporting
springs h, substantially as described.
Second. In a sifting machine of the kind herein described, the arrangement of
striking hars c, and of carrying bars or frames n, in combination with the
distributing apparatus p, q, r, s, substantially as described with reference to
Figures 7 to 9 of the drawings, and for the purposes specified.
Third. In a sifting machine of the kind herein described the cleaning or stripping
apparatus which consists of rollers placed perpendicularly to the direction of
motion of the sieve, the said rollers being rotatable on their axes, but not
otherwise movable, and placed at a short distance below the sieves, and of striking
bars e arranged above the sieve, substantially as described with reference to
Figures 2 and 3 of the drawings.
Fourth. In a sifting machine of the kind herein described the cleaning or
stripping apparatus, which consists of fans of soft material, so arranged below the
gauze or other sifting medium, that they are reciprocated in contact with the
sieve by the motion of the latter, substantially as described with reference to
Figures 11 to 13 of the drawings.
Fifth. In a sifting machine of the kind herein described the employment of
sieves such as A, W, C, E, G, 1, for example, arranged zigzag one below the
other, and divided into sections with corresponding outlet passages below them,
substantially as described with reference to Figure 10 of the drawings.
PALAI GUS LACURLY LOH
E. TRUMMER,
Per W. H. Beck,
115 Cannon Street, London, E.C., Agent.