Improvements in and relating to Devices for Cleaning the Sieves of Sifting Apparatus.
Year: 1891

page_text: Date of Application, 1st Aug., 1891-Accepted, 10th Oct., 1891
COMPLETE DIECIFICATION.
Improvements in and relating to Devices for Cleaning the Sieves of
Sifting Apparatus.
I, HEINRICH SECк of No. 15 Leabuitzer Strasse, Dresden in the Kingdom
of Saxony Empire of Germany, Manufacturer, 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 more particularly to sifting apparatus having flat sieves, to
the carrying frames of which is imparted, by any of the well-known means, a succes-
sion of horizontal or approximately horizontal movements in a circular or curved
direction, or which are rocked in a rectilinear or nearly rectilinear direction, and
the object of my invention is to provide a device for keeping the sieves or sifting
surfaces of such sifting apparatuses clean by removing therefrom particles of the
flour, middlings, or other material to be sifted, or any other obstructions, as may
have settled between the meshes of the sifting surfaces.
My invention, therefore, consists in the features of construction and in the
combination of the parts as hereinafter described, and comprises one or more
movable brushes travelling in contact with and along the sifting surfaces of the
sifting apparatus in a predetermined direction during the process of sifting, and
thereby cleaning, the meshes of such surfaces from any obstructions which may
have settled therein.
In the accompanying drawings-
Figure 1 is a vertical transverse section of the body of a sifting apparatus showing
the travelling brushes arranged therein.
Figure 2 is a horizontal section of part of the body of the said sifting apparatus
with travelling brushes, the endless band and the device for preventing the moving
parts from travelling in more than one direction.
Figure 24 is a vertical sectional view of part of the apparatus showing the
arrangement of the device for preventing the movement of the travelling brushes
in one direction.
Figures 3, 4 and 5 are a vertical transverse section, a plan and a vertical longi-
tudinal section, respectively, showing a modified arrangement of the brushes.
Figures 6 and 7. are a longitudinal vertical section and a transverse vertical
section, respectively; showing a modified arrangement of certain parts of the
device.
Referring to Figures 1, 2 and 24 of the drawings and to the arrangement
thereby illustrated, the brushes are fastened to the carrier frames a arranged
within the sifting apparatus A, the said frames being attached to an endless band r
carried over rollers h. The endless band r is provided with pegs or teeth i engaged
by a pawl k arranged on a standard or rib within the apparatus, the said pawl
riding the teeth or pegs on the band as the same is moved in one direction, but
engaging the said teeth or pegs against a movement of the band in the opposite
direction.
When the sieve frame is given a circular or curved horizontal or approximately
horizontal or a straightforward rocking movement by any of the well known means
not shown, the brushes with their carrying frames will be swung with the tendency
of a reciprocating movement over the sifting surface, the said movement being
limited in one direction by the pawl k engaging the teeth i on the endless band
whilst the said band being free to move in the opposite directions, the brushes will,
in following the endless band be gradually, or stepwise, carried around on the
sifting surface.
The flour or other material to be sifted having been introduced into the apparatus

page_text: At the
in the usual manner, will be carried along over the sifting surface by the motion of
the sieve, and the travelling brushes scraping against the said surface, will thereby
effectually clean the several meshes thereof pushing through the same any of the
material which may have settled therein thus keeping the meshes of the sieve
continually open and thereby securing a proper action of the apparatus.
same time, in the arrangement as shown in Figures 1, 2 and 24 of the drawings,
the said brushes while travelling over the surface of the sieve will assist in con-
veying the material deposited on said surface, across the latter by imparting a
positive movement to the said material,.as will be readily understood:
In the modified arrangement illustrated in Figures 3, 4 and 5 of the drawings,
the brushes 6 instead of being arranged above the sifting surface, are shown as
being arranged below the same so as to enter the meshes from underneath and
thus to clean the same by pressing out the obstructions in an upward direction.
The brushes b are here shown as being attached, by means of a saddle, to carrying
blocks c connected with each other by strings or chains and moving on an endless
ratchet-bar d arranged within the sifting apparatus below the sifting surface, the
teeth of the said bar being engaged by pawls e preferably made of leather or
other flexible material and projecting laterally from the carrying blocks c of the
brushes.
с
When the sieve frame is given the usual curved horizontal or rectilinear rocking
movement the said pawls e will ride the teeth of the ratchet in one direction, the
brushes being thus carried around within the apparatus with their carrying .blocks c
in the same manner hereintofore described with reference to the brushes arranged
above the sifting surface.
Instead of a ratchet bar and pawl I may also in the modified arrangement as
shown in Figures 6 and 7 of the drawing, provide a smooth endless guide bar or
rib d'engaged by the friction of a cam f of the brushes in one direction of the
movement of the latter, whilst in the other direction of movement the said cam
will slide freely on the said guide bar.
I wish it to be understood that I do not confine myself to the special constructions
and arrangements of parts as shown in the accompanying drawings but that I
consider, as falling within the scope of my present invention, all sifting apparatuses
provided with rotary or rocking sieves having combined therewith brushes moved
along the surface of the said sieves in a predetermined direction by the motion
of the latter, and prevented from retrograde movement by special devices adapted
for the latter purpose.
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.
First. In a sifting apparatus the combination, with a rotary or rocking sieve,
of one or more travelling brushes receiving the required motion from the rotary or
rocking motion of the said sieve, and means for preventing a movement of said
brushes in a direction opposite to that in which they are travelling substantially as
and for the purposes specified.
Second. In a sifting apparatus the combination with one or more travelling
brushes carried on an endless band, of a pawl engaging with pegs or teeth on the
said endless band and preventing a movement of the said band and its brush or
brushes in one direction, but allowing the same to move freely in the opposite
direction, substantially as and for the purposes set forth.
Third. In a sifting apparatus the combination, with one or more travelling
brushes, of a number of carrying blocks for the same connected with each other by
strings and carried on an endless ratchet bar in one direction under the action of
the swinging or shaking movement of the sieve frame and of a pawl engaging the
teeth of the said ratchet bar and preventing a movement of the carrying blocks
and brushes in more than one direction, substantially as and for the purpose set
forth,

page_text: Fourth. In a sifting apparatus the combination with one or more carrying blocks,
having travelling brushes attached to the same of an endless guide bar or rib along
which the said carrying blocks with their brushes are moved in one direction over
the sifting surface under the action of the swinging or shaking movement of the
5 sieve frame and of a cam engaging the said guide bar or rib by friction; substan-
tially as and for the purpose set forth.
Dated this Diest day of August 1891
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.