Year: 1892

page_text: Date of Application, 16th Sept., 1892-Accepted, 15th July, 1893
Jine D.
The working parts of the machine are mounted in a frame chiefly consisting of
4 posts M, wooden walls N, and a pair of bearings band which support and guide
the shaft d. The latter is provided with a journal or step f and with a belt
pulley n.
The bushes g and i of the bearings and b are divided and adjustable.
The whole stand is divided into three compartments A, B and C by means of
partition plates o, o¹, o, o³, fixed to the frame by screws. A sheet metal trough
riveted to the bottom plate os serves to form a fourth compartment D.
On the driving shaft d are mounted by means of screws the conical
drums, c, c², having inclined beaters or fan blades 1, 1, 1, while the correspondingly
conical sieves m, m³, m², surrounding the said blades, are mounted on wooden bars
or laths s, 1, 8². These bars are placed in the compartments A, B, and C, and
arranged in circular rows, the upper ends being secured to the partitions o, o¹, o³,
by means of angle iron rings, while the lower ends are screwed upon partitions t, t, t
secured to the framework.
In this mauner three inner compartments are formed in the compartments A, B,
and C, which may be called the working chambers, because they enclose the
revolving beaters or fan bodies.
The upper shaft bearing 6 supports a feed hopper a, which leads to the
compartment A.
The machine works as follows:―
The raw material, such as ground cereals as they come from, the grinding mill, is
continuously fed into the hopper a and delivered by the latter to the uppermost
beaters or revolving fan blades 1, which project it against the surrounding conical
sieve m.
From the latter the material (that portion which has not passed through
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page_text: the sieve) falls back upon the beater, which again throws it against the sieve, so
that the material descending between the two conical surfaces describes a zigzag
line. The bran or husk parts collect below the beater drum c and are conducted
towards the circumference by blades e formed on the bottom of the drum, so as to
escape finally through a shoot H. The flour and middlings which have passed
through the sieve m, collect on the floor o¹ of the compartment A, and are drawn
towards the centre by a revolving spiral blade or guide p screwed to the shaft d,
after which they drop through a circular central opening of the partition o¹ upon
the beaters of the second beater drum c¹.
The heaters or revolving fan blades throw this mixture against the sieve m¹,
which allows the good flour to pass through into the (outer) space B, while the.
middlings descend in the annular space between the drum and the sieve to the
bottom of the latter, whence they are swept towards the centre by a spiral blade k
fixed to the bottom of the beater drum. The good flour, which has passed
through the sieve m' and collects at the bottom, is conducted to a circumferential
outlet or shoot F by revolving blades g. The middlings drop through an axial
opening of the partition t' upon the third beater drum c, as indicated by arrows.
The hub of the revolving guide or fan q (or the parts of the same) serve to
intercept or prevent the communication between the central openings and the
surrounding space.
The beaters of the drum c² throw the material against the sieve m². The fine
middlings, which pass through it, collect at the bottom and are conducted to the
shoot G by revolving blades q', while the coarse middlings which collect on the
bottom of the sieve m² are conducted to the central opening of the same by a spiral
blade u'secured to the bottom of the drum ².
The hub of the fan q' is secured to shaft d by screws ³, and its circumference
serves again to prevent communication between the central opening and 'the
surrounding space. From the central opening the residue falls into a trough Dând
thence into a shoot I.
The course which the materials take through the machine, is, indicated in the
drawing by arrows:
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. A sifting machine having conical or conoidal beaters or fan bodies, with
vertical axes of rotation and correspondingly conical or conoidal sieves surrounding
the said beaters, the said beaters being adapted to throw the material against the
sieves, and the latter being placed so, that their diameter decreases from the bottom
towards the top, (instead of having the base of the cone at the top), substantially
as described.
2. A sifting machine of the type specified above which is adapted to sift the raw
material into bran, fine and coarse middlings, and flour by a single operation or
passage, the said material being thrown by conical beaters (c c¹ and *) first against
the wide meshed conical sieve (m), subsequently against the finest sieve (m²) and
finally against a sieve (m²) having meshes of medium width, while the bran, the flour,
and the middlings are discharged through shoots (H, F, G, and I), substantially
as described.
Dated this 16th day of September 1892.