Improvements in Mixing Machines for Flour and other Pulverulent Material.
Year: 1893

page_text: Date of Application, 23rd June, 1893-Accepted, 29th July, 1893
COMPLETE SPECIFICATION.
Improvements in Mixing Machines for Flour and other Pulverulent
Material.
1, ROBERT HARTMANN, of Kerb'sche Muehle near Dingelstaedt (Eichsfeld) in
the German Empire, 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 :-
The present invention relates to a mixing machine of the kind described in
Specification No. 7967 of 1893 and consists principally in the employment of a
longitudinally-reciprocating tube or hollow shaft instead of a rotating one
described in that Specification.
The new arrangement is represented in the accompanying drawings in which
Figure 1 is a vertical section, and
Figure 2 is a plan.
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The apparatus consists of a stationary vessel A of circular, rectangular, polygonal
or other form in cross-section, with a conical bottom B to the lower part of which
is secured the outlet D. In the centre of the vessel A is arranged a tube or
hollow-shaft C which extends the whole length of the apparatus. This tube or
hollow shaft may be made of sheet metal provided with openings formed by cutting
open and bending outwards the shell, or it may be made of wire-cloth, gauze or
the like.
In this case the apertures of the tube or hollow shaft C which, as shown in the
drawing of the Specification No. 7967 of 1893, to correspond with the varying
degrees of pressure, are gradually decreased in size as they approach the lower part
of the apparatus, may be replaced by a wire-cloth or gauze the size of the meshes
of which decreases gradually as they approach the lower part of the apparatus.
Above the conical bottom B of the vessel A are arranged inclined shelves E
between which are left openings B₁ B B B and by which the materials to be
mixed are divided into parallel columns which stand on different bases in such a
manuer that they move at different speeds towards the centre of the vessel where
they are proportionately mixed and discharged. The tube or hollow shaft C is
connected with a crank D' eccentric or the like in such a manner that it can be
moved up and down. By this movement the materials which are pressed towards
the tube or hollow shaft Care received by the tube or hollow shaft and mixed and
discharged.
With regard to the arrangement of the apparatus described in the before named
Specification No. 7967 of 1893 the up and down movement of the tube or hollow
shaft has the advantage that the movement of the divided columns towards the
centre of the apparatus is supported and the mixing and discharging process within
the tube or hollow shaft of the vessel is accelerated.
For some kinds of material this increased movement is however not sufficient, for
instance for spelt-flour, which forms very easily into balls or lumps so that it was
hitherto impossible to mix it by machines. For such materials an endless band
with transverse slats may be arranged on each of the inclined shelves E, as shown
in Figure 3 of the drawing which band driven from the exterior, moves in the
direction of the arrow (Figure 3) towards the tube or hollow shaft.
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 ;-
1. In a machine such as described in Specification No. 7967 of 1893 for mixing
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page_text: shaft of a longitudinally-reciprocating tube or hollow shaft of perforated sheet
metal wire-cloth gauze or the like substantially as described.
2. In a machine such as described in Specification No. 7967 of 1893 for mixing
flour and other pulverulent material the arrangement of an endless band with
transverse slats on the shelves which divide the materials to be mixed into columns
for the purpose of moving the material to be mixed towards the centre of the
apparatus substantially as described.
Dated this 23rd day of June 1893.
W. P. THOMPSON & BOULT,
Of London, Nottingham, Liverpool, and Manchester,
Agents for the Applicant.