Improvement in Sifting Machines having Oscillating Flat Sieves.
Year: 1899

page_text: Date of Application, 15th Apr., 1899-Accepted, 21st Oct., 1899
COMPLETE SPECIFICATION.
Improvement in Sifting Machines having Oscillating Flat Sieves.
I, ANDREAS HUGO CHRISTIAN LAUTE, a subject of the Emperor of Germany
and resident of No. 39, Beusselstrasse, Berlin, in the Empire of Germany,
Engineer, do hereby declare the nature of my said 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 improvement in sifting machines having oscillat-
ing flat sieves, such improvement consisting in the arrangement of a depositing
chamber, provided with smaller chambers or compartments, in direct connection
with the sifting machine, in which depositing chamber, the material is driven
from the discharging ends of the collecting floors and in whose (depositing
chamber) compartments, the particles of the material are deposited according to
the specific weight thereof. This improvement is preferably carried out in such
a manner that at the discharging end of the collecting floors of the sifting
machine, sorting boxes are provided, in which an air current is produced by
a ventilator or other suitable apparatus, driven by the shaft operating the sifting
machine.
In the accompanying drawings, the improvement is shown by way of example
in connection with a plane sifter adapted to sort meal or flour.
Fig. 1 is a view of the plane sifter and the sorting or dressing device in longi-
tudinal section,
Fig. 2 is a section on line AB of Fig. 1,
Fig. 3 is a general plan in longitudinal section explaining the arrangement of
the driving mechanism,
Fig. 4 is a cross section according to Fig. 3.
In the apparatus as shown, the plane sifter a is elastically suspended in the
known or usual manner and receives an eccentrically shaking and oscillating
motion by means of a crank pin engaging with the sifter vertically from below.
An eccentrically mounted driving mechanism is positively connected with the
driving shaft for instance, by clutch pins 1, engaging in the pulley b, which
driving mechanism may be constructed as pulley, friction wheel, toothed wheel
The construction of the
or the like and serve for driving the ventilator g.
driving mechanism does, however, not form the subject matter of the present
invention and is therefore not explained in detail.
The plane sifter a is provided with inclined flat sieves d and plane collecting
floors of the known or usual kind. In the transverse walls of the plane sifter
openings are provided at the discharging end of the collecting floors, through
Each box
which openings the material passes into sorting or dressing boxes e.
communicates with a suction chamber through a channel f, in which former, a
ventilator g is provided. An active air current is produced in the sorting or
dressing boxes by the suction of the ventilator, by which current, the material
driven from the collecting floors by the oscillations of the plane sifter, is carried
along more or less distant, according to its specific weight. In order to effect
a separation in the dressing boxes of the particles of the sifting material accord-
ing to its specific weight there are provided in the boxes, cross stays with adjust-

page_text: able flaps i, forming chambers or compartments, in which the particles of the
material are deposited when falling to the bottom. By the arrangement of the
adjustable flaps i, the size of the inlet openings of the various chambers or com-
partments can be regulated. The particles of the material, which have not
dropped down into the dressing boxes, are caught by a filter k and removed there-
from by a beating-off device or the like, whereupon they are collected and con-
ducted away in a suitable manner.
The number of the dressing or sorting boxes and their distribution in regard
to the collecting floors, may be chosen at will according to the desired degree of
the separation.
It is not absolutely necessary to utilize an air current in the dressing boxes.
On account of the material being driven beyond the discharging end of the col-
lecting floors into the dressing boxes in consequence of the oscillations of the
plane sifter, a separator of the particles of the material according to its specific
weight is also effected without employing an air current; the arrangement of
a ventilator can therefore eventually be desisted from.
The above described improvement serves as substitution of the groats and dust
winnowing or sorting machines hitherto in use and is superior to the latter on
account of the considerable saving of power and space. Since the plane sifter
is connected with the dressing boxes, air suction also takes effect in the sieves,
such air suction loosening and airing or ventilating the material and keeping
the sieve meshes clean, whereby the sifting action is again improved and the
durability of the sieves is increased.
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:-
1. In sifting machines having oscillating flat sieves, the combination of col-
lecting floors with depositing chambers containing smaller chambers or com-
partments, such depositing chambers being provided in direct connection with
the sifting machine at the discharging ends of the collecting floors, substantially
as and for the purpose set forth.
2. In sifting machines having oscillating flat sieves, the combination of col-
lecting floors with dressing or sorting boxes provided at the discharging ends of
the former and a ventilator or equivalent device, substantially as and for the
purpose set forth.
1141
1
1000
TONGUE & BIRKBECK,
31, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.