Improvements in and relating to Sifting and. Bolting Apparatus.
Year: 1895

page_text: Date of Application, 16th: Feb, 1895-Accepted, 17th Aug., 1895
COMPLETE SPECIFICATION.
Improvements in and relating to Sifting and. Bolting Apparatus.
I, GUILLIUME WERDER, of 3 Rue des Moulins, Charleroi, in the Kingdom of
Belgium, Engineer, 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 :-
My invention relates to sifting and bolting apparatus chiefly designed for sifting
and bolting groats and flour in the grinding of grain. For this operation I make
use of rotary movement to actuate horizontal sieves provided with channels wherein
the material is caused to pass to-and-fro, without pallets, rakes or the like and
without any stoppage of the material in its passage..
:
In the accompanying drawings
Figure 1 is a plan of my improved sieve provided with four channels in which the
material is adapted to pass in the same direction.
Figure 2 is a transverse section thereof on the line x x looking in the direction of
the arrow..
Figure 3 is a plan of a sieve having four channels wherein the material is adapted
to travel in opposite directions.
Figure 4 is a transverse section of Figure 3 on the line ¹¹ looking in the
direction of the arrow.
Figure 5 is a plan of a sieve with a portion of the silk or gauze broken away to
show the arrangement of the brushes and their supports.
Figure 6 is a longitudinal section of this sieve.
Figure 7.is a cross section thereof on the line looking in the direction of the
arrow.
;
Figure 8 is an enlarged cross section showing the arrangement for adjusting the
inclination of the gauze.
Figure 9 is a similar section showing two channels.
Figure 10 is an enlarged cross section showing the arrangement of the brush and
adjustable brush supporting device and
Figure 11 is a detached view of the said brush supporting device.
Similar letters of reference indicate corresponding parts in the several figures of
the drawings.
As shown in the drawings the sieves are divided into four channels, and I give
to the wire gauze or fabric an inclination, which may be varied according to the
material to be treated.
By this means the material, which in the simple rotary-movement tends to turn
upon itself, advances gradually, progressively and without stoppage.
I may arrange the sieves so that when the material arrives at the end of one
channel or series of channels it will pass back along another channel or series of
channels or along another sieve in the opposite direction without the necessity of
changing the rotary movement of the apparatus; for this purpose the wire gauze
or fabric in the backward channel is inclined in the opposite direction to that of the
forward channel.
The inclination of the gauze or fabric must be greater or less according to
the nature of the material to be sifted or bolted; it is evident that the lighter this
material the smaller will be the inclination.
As shown in Figure 8 the portions A A' form the framing or partitions of the
channel; B B' are the movable clamping pieces placed in the interior against the

page_text: walls of the framing of the channel and serve to securely hold the sifting gauze or
fabric C which is pressed between the parts A and B on the one side and A¹
and B on the other side. The clamping strips or pieces B B¹ are fixed to the walls
of the framing A A' by means of screws DD' and can be adjusted in height with
regard to one another according to requirements, which; manipulation can easily be
effected since between the walls of the framing A A¹ of the channel and the
ledges B B a portion of the gauze or fabric is left overlapping which can serve for
the elongation of the said gauze or fabric in case the latter is required to be
adjusted to a greater angle of inclination.
As regards the position of the gauze or fabric it should be pointed out that the
inclination given to the said gauze in the direction of their width is from the right
to the left or from the left to the right, according to the direction in which it is
desired that the material is to be moved. The said material is to pass along from
the feed ends X of the channels in one direction and to return in the other, as
indicated by the arrows.a in Figure 3 while the machine on its part continues to
rotate in the same direction as indicated by the arrow b in the said Figure 3.
It is evident that by the aid of this arrangement the material under treatment,.
which owing to the rotary movement is forced forward, but tentls.to: return, over its
own bulk, is, owing to the effort which it must.exert to overcome the slope,
prevented from completing its whole revolution before being again taken up by the
second propelling, movement as will be seen by the arrow. c in Figure 3.
It follows from this that the material advances owing to the slope of the sifting
gauze, which slope or inclination is made. greater in proportion as the material to
be treated is owing to its nature to encounter more or less resistance, in. its
advancing motion,
Figure 9 is a cross section of a sieve including two channels formed, by the
frames AAA in which the gauze C in the left-hand.channel is inclined
downwards from the left toward the right and in the right-hand channel from..the
right toward the:left..
As the rotary movement is imparted in the direction of the arrow b. Figure 3, it
follows that the material under treatment in the left hand channel will pass forward
and that in the right-hand channel will pass backward as indicated in the two
upper channels in Figure 3 herein before referred to.
For the purpose of cleaning: the under side of the sifting gauze I arrange a
brush E Figure 10, below the gauze in each of the channels of the sitting
apparatus and at an inclination, corresponding to that of the said gauze.
This
brush. E, is carried by supports El adjustable as regards their height by means of
screw rods E³ and nuts E and is perfectly free to slide in any direction upon the
said supports by reason of therrotary motion of the sieves..
The said brushes. are, approximately of the same length as the channels of the
sieves, and about one filth the width of said channels as shown in Figures 6 and 10.
It therefore follows that this brush, which is made of more or less soft and smooth
material.according to requirements, will continually clean the sieves beneath which
it works and will not become dirty since, owing to its being continually thrown in
all directions against the walls of the channels it will be automatically freed from
all floury substances. The supports E' for the brushes E are adjusted in such a
manner that the said brushes will always move parallel with regard to the sifting
silk, or gauze, which thus produces a continuous effect on the said ganze irrespective
of the angle of inclination at avhich the said sifting silk is adjusted.
By the use of tho said invention; I gain. considerable advantages. In the first
place I absolutely solve the difficulty of the forward movement of the material in
the sifting and bolting by horizontal rotary movement. I obtain this result
without having to incline the sieves themselves thereby diminishing the bulk of
the machines, simplifying the movement, and economizing space; I do not require
either stops, rakes or pallets or the like, the arrangement of which is always
difficult and arbitrary and have the great inconvenience of abruptly stopping the
material by allowing it to accumulate at a point and projecting it suddenly in

page_text: the opposite direction to the great detriment of a regular sifting or bolting
operation.
The speed of the machine and the inclination of the wire gauze or fabric having
been properly regulated the sifting or bolting takes place gently by equal layers
of material, thus ensuring the perfection of the operation; all the points of the
sifting or bolting surface are in contact with the material to be treated, there is
never any loss and always the same velocity and the same movement. It will thus
be seen that with a comparatively small apparatus I may obtain an enormous
sifting or bolting surface, no part of which is useless.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A sifting and bolting apparatus in which use is made of a rotary movement for
actuating horizontal sieves divided into channels, the wire gauze or fabric being
arranged so as to ensure the passage of the material in all directions during the
sifting or bolting, and to enable it to be adjusted in position for various kinds of
material, substantially as hereinbefore described and represented in the drawings.
Dated this 16th day of February 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.