IMPROVEMENTS IN SMUTTING AND CLEANING GRAIN IN COMBINED THRASHING MACHINES
Year: 1871

page_text: PROVISIONAL SPECIFICATION left by John Butler Edlington and
Thomas Edlington at the Office of the Commissioners of Patents,
with their Petition, on the 19th December 1871.
We, JOHN BUTLER EDLINGTON and THOMAS EDLINGTON, Engineers,
of Gainsborough, in the County of Lincolnshire, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN SMUTTING AND
CLEANING GRAIN IN COMBINED THRASHING MACHINES," to be as follows:-
This Invention.consists,
ין
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Firstly. In applying an exhaust in addition to the usual blast
common to all thrashing machines, such exhaust or partial vacuum
being effected either by connecting the suction of the usual blast
fan, or, by an independent fan for the purpose of removing "smuts
and other impurities from the grain after having been thrashed out, and
during the process of dressing as herein-after described.
"
Secondly. In using either in combination or separately with the
before-mentioned exhaust a "riddle" "shoe" or vibrating sifter containing
two or more sieves of various sized meshes, which receive the grain

page_text: after having passed through the ordinary scrubber for the purpose
of more
completely freeing the grain of extraneous matter as herein-
after described.
Thirdly. In imparting to the above-mentioned riddle-a more rapid
vibration than that at present adopted for the ordinary riddles or
vibrating sifters through which the grain passes before entering the
scrubber.
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For the purpose of effecting the first part of our improvements,
viz., the removing of smuts and other light substances, the grain after
being thrashed and winnowed in the usual manner, and carried up
by the elevator, is met as it falls into the scrubber or other cleaning
apparatus by the exhaust or draught of air," the force of which is
so regulated by means of a suitable valve or other well-known apparatus
as to allow the grain and heavier seeds to fall, but which is of sufficient
power to convey away by its impetus the aforesaid smuts and other
light substances. By carrying off the smuts at this stage of the process
of cleaning the grain, the grain is preserved from discolourisation
through the breaking of the smuts by the action of the scrubber.
In order to obtain the necessary current of air for this purpose the
space is, enclosed-by-pipes or enclosures of wood or other suitable
material connected to the inlet of the usual blast fan, or it may be
worked by a separate fan.
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For the purpose of carrying out the second part of our Invention,
viz., the removing of impurities too heavy to be conveyed
awayn
by
the aforesaid, exhaust, such as small seeds, capes or grain stalks,
and other matters, the grain is as in combined thrashing machines
allowed to fall upon a
riddle" or sifter. Instead however of using
the usual well-known description of riddle, we preferato apply toTit
two or in some cases more than two, sieves. The upper sieve or that
which first receives the contents of the scrubber is composed of meshes.
sufficiently large, to allow the grain to pass through, but small enough
to retain the "capes" and other larger, impurities. The second sieve
is.composed of meshes too small to allow the grain to pass through, but
of sufficient dimensions to allow the passing through of small seeds and
other small impurities that were too heavy to be removed by the exhaust
as herein-before described. The impurities retained in the top screen,
as also those fallen through into the lower screen, are allowed" to pass
away by a side outlet. The grain retained in the middle screen or
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page_text: screens in its passage to the usual revolving separator is again met
by the current of air caused by the exhaust, and thus whatever
impurities that may still remain in the grain are carried off.
1
The third part of our improvements consist in imparting to the riddle
or screen herein-before mentioned, a more rapid vibration than that
necessary for the vibrating sifters which receive the grain before it
enters the scrubber. For this purpose, instead of driving it in the
usual manner by means of a connecting rod attached to one of the
aforesaid riddles or screens, we sometimes prefer to use a vertical
shaft driven by means of bevel wheels from a strap connected to one
of the revolving shafts actuating the upper riddles, proportioning these
strap pulleys so that the required speed may be obtained, or it may
be driven direct from the fan shaft by means of a strap, the diameters
of the pulleys being proportioned accordingly, or in any other convenient
and well-known method. The object of driving this riddle or screen at
a greater speed is to more effectually cleanse the grain before passing
into the revolving screen or separator.