Separating Apparatus for Grain Cleaning Machine.
Year: 1899

page_text: Date of Application, 19th May, 1899-Accepted, 24th June, 1899
COMPLETE SPECIFICATION.
Separating Apparatus for Grain Cleaning Machine.
I, WILHELM ROBRAHN, of Beverstedt, Hanover, in the German Empire, Manu-
facturing Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascer-
tained in and by the following statements:-
This invention relates to grain cleaning and separating machines and has
for its object the better separation of the seed of weeds tares and similar
impurities from the grain.
This invention has the great advantage over other machines designed for the
same purpose that the grain is fed not merely to one place, but is distributed
at once over the whole roller surface whereby the treatment is rendered more
effective.
The accompanying drawings illustrate how the invention may be carried into
effect, and show the apparatus combined with a machine of known construction,
and also separate.
Figures 1 to 3 shew the apparatus combined with a machine.
Figure 4 and 5 shew transverse and longitudinal sections respectively of
the improved apparatus by itself.
The apparatus consists of an adjustable delivery device 1, (on which falls the
grain which comes from the jigging apparatus over a shelf e) and of rollers 2
and 3 situated at both sides of the delivery device 1. The whole circumferen-
tial surface of the rollers 2 and 3 have pore-like recesses. Above the rollers 1
and 2 is a skimming device 5 of sheet metal wood or other suitable material
which extends over the whole length of the roller.
Below the rollers 2 and 3 are arranged brushes 6 also along the whole length.
The operation of the device is as follows.
The grain is fed through the hopper a Fig. 1 of the machine to a known
jigging device b adjustable as to height by a spring device, and the larger part
of dust, sand, gravel &c. is separated by the action of the blast from the fan d.
In order to be entirely cleansed from remaining impurities the grain passes
over the shelve e to the delivery device 1 whence it is fed to the circumference
of the rotary rollers 2 and 3.
By means of the crank i Fig. 2 or by a belt and pulley or other device a
wheel Fig. 1 is operated, which is formed at its outer periphery as a chain
wheel and at its inner periphery as a cog wheel. The wheel y rotates the
wheel g engaging with its inner cogged rim, and the ventilator situated on
the same axle.
The wheel is connected by a chain with a wheel which drives the
bucket chain of the elevator. The chain h actuates a wheel situated on
the axle of the transporting worm f, therefore simultaneously a cog wheel 95
situated on the same axle and also a chain wheel g. The first engages with a
cog wheel situated on the axle of the right hand drum 2 which cog wheel
engages with a cog wheel 7 situated on the axle of the drum 3. When the
fan is rotated as indicated by an arrow, the rollers are rotated in the direc-

page_text: tion of the arrows shown in Fig. 4 by the gearing g³ g g³ g6 &c. Therefore one
drum is rotated to the right and the other to the left.
By means of the adjustable delivery device 1 the orifice 7 between the deli-
very device 1 and either of the roller peripheries may be regulated so that only
grain of elongated form and comparatively small diameter can pass through
while the seed of tare, corn, cockle and other weeds growing with corn are taken
in the porelike recesses of the rollers and are thrown off after it has passed under
the skimming device 5. The skimming device 5 prevents the loss of grain
which might have been carried away by the roller and is there thrown back
because only small round bodies can pass the skimming device in the porelike
recesses.
Brushes 6 are provided to prevent impurities entering the space r, the separated
grain, being collected and delivered by the worm f to be carried by the elevator
buckets on the elevator chain h into the conduit 12.
It is obvious by the means as described the grain is separated from other seeds
admixed therewith in a most perfect manner.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is-
1. A separating device for grain cleaning machines, having an adjustable
roof like delivery device and two rotary rollers one on either side of said deli-
very device having porelike recesses upon the periphery in order to receive and
remove impurities or other seeds from the grain passing between rollers and
delivery device substantially as described.
2. In the separating device claimed in Claim 1 the arrangement of a skim-
ming board or plate arranged upon the top of the rollers parallel to their axis
and adapted to be adjusted relatively to the rollers to prevent the passage of
grain adhering to exterior of said rollers substantially as described.
3. In a device as claimed in Claim 1, the arrangement of brushes between the
adjacent faces of the two rollers and the edge of the collecting tray to prevent
the admission of impurities to the separated grain in said collecting tray sub-
stantially as described.
Dated this 19th day of May 1899.