Improvement in Machinery or Apparatus for the Economical Milling and Cleaning of Paddy or other Grain.
Year: 1890

page_text: Date of Application, 19th June, 1890
Complete Specification Left, 17th Mar., 1891-Accepter, 2nd May, 1891
PROVISIONAL SPECIFICATION.
Improvement in Machinery or Apparatus for the Economical Milling
and Cleaning of Paddy or other Grain.
CHARLES GAIRDNER of Bassein in Lower Burma an Assistant in the firm of
Messrs. Bulloch Brothers & Co. Rice Millers and Merchants and ROBERT RAMSAY,
of Bassein in Lower Burma an Engineer in the employment of the said firm do
hereby declare the nature of this invention to be as follows:-
The machine consists of a spindle or shaft (A), which may be placed either
vertically or horizontally carrying a hollow disc (B) fitted inside with arms (C)
which may he either straight angled, curved, or placed zig-zag for cleaning or
Scouring purposes. The hollow of the dise being either flat or tapered from feed
centre (D) to rim (E) where the grain is discharged against a circular stone or
cement casing (F) fixed at various angles and distances to suit the nature of the
grain operated upon, from thence it passes into the hopper underneath. When
used for cleaning or scouring, the casing of stone or cement is substituted by one of
wire-cloth.
The machine is fed from the centre by means of an adjustable feed (G) which is
regulated by raising or lowering a valve (H) attached to the spindle so
distributing the grain equally all round.
The disc is raised or lowered as the quality to be produced may require-by
means of elevating gear attached to the footstep.
The principal novelty of the invention consists in the hollow dise furnished with
arms and outer circular casing.
Dated this 9th day of September 1890
C. GAIRDNER and
R. RAMSAY,
By their Attorney, C. F. Hodges.
COMPLETE SPECIFICATION.
Improvement in Machinery or Apparatus for the Economical Milling
and Cleaning of Paddy or other Grain.
We, CHARLES GAIRDNER of Bassein in Lower Burma an Assistant in the firm
of Messrs. Bulloch Brothers & Co. Rice Millers and Merchants and RORERT
RAMSAY of Bassein in Lower Burma an Engineer in the employment of the
said firm, 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, regard being had to the drawings hereto annexed and
after referred to :-
The machine consists of a spindle or shaft (A) which may be placed either
vertically or horizontally but preferably vertically carrying a hollow disc or
revolving chamber (BB) consisting of two circular discs or plates of any suitable
material the sides of which may be either parallel or tapered preferably the latter
as shown in Figs. 1, 2 and 8. The lower disc or plate is fixed to the spindle and
the upper disc or plate bolted to the lower one as shown in the section in drawing
No. 8 so as in the case of a tapered chamber to make the surfaces wider apart at
the centre than the periphery. The upper disc or plate has a circular opening in
the centre for the feed and the discs or plates are kept apart by the arms or
blades (C) which may be either straight or angled or curved in any manner (see
Figs. 3, 4 and 5). Surrounding the hollow disc or chamber may be placed a

page_text: casing of stone or composition such as is commonly used in rice milling set at
various angles to the chamber to suit the nature of the grain operated upon and the
extent of the milling required as shown in Fig. 1 (E E) or there may be substituted
for this casing a rim forming a continuation of the upper disc of the chamber such
rim being faced with similar stone or composition as shown in Figs. 2 (G. G) and 8
(G1 and G2) and set at any suitable angle.
When the hollow disc or chamber is used for cleaning or scouring grain the
inner surfaces may be covered with composition of the kind above mentioned in a
series of corrugations or zig-zags (Figs. 6 and 7) and a sheet iron or wire cloth
casing used instead of the one made of stone or composition already mentioned.
The feed arrangement is fixed over the centre of the upper disc or plate and
consists of a hopper (F) with a valve (D) revolving with the spindle for the
purpose of regulating and insuring an equal and steady feed.
The following is a detailed description of the process of milling as effected by the
machine above described.
For milling paddy or other grain (which operation primarily consists in the case
of paddy in milling it) the grain is fed into hopper (F) a steady and equal feed of
the required quantity into the hollow disc or chamber being secured by the
regulation of a valve (D) as circumstances may require from time to time. The
hollow disc or chamber is made to revolve at a high speed by suitable motive
power and the paddy or other grain is discharged by centrifugal force against the
casing of stone or composition and thereby husked. After being so husked the
paddy or other grain being operated on passes into the hopper underneath. With
the stationary casing (E E Fig. 1) the extent of the milling required to hull the
grain is regulated by raising or lowering the spindle carrying the revolving chamber
By suitable mechanical means so as to reduce or increase the distance between the
periphery of the hollow disc or chamber and the surface of the casing as may be
desired. In the case of a stone or composition surface revolving with the hollow
disc or chamber as hereinbefore described the extent of the milling required is
regulated by varying the speed of the machine.
For cleaning or scouring the grain or paddy is fed into the hollow disc or chamber
in the manner above described and the operation of cleaning and scouring it is
effected by its being carried by centrifugal force through the cemented corrugations
or zig-zags (HH in Fig. 6) on the inner surfaces of the chamber.
A series of hollow discs or chambers may be used on one spindle for either
milling or cleaning.
Having now particularly described and ascertained the nature of our inven
tion and in what manner the same is to be performed we declare that what
we claim is
(1) The combination of the several parts herein before mentioned into an
improved machine or apparatus substantially as hereinbefore described for the
milling i.e. hulling and cleaning of paddy or other grain.
(2) The combined application of hollow discs or revolving chambers with arms
substantially as hereinbefore described and a casing or rim of stone or composition
also substantially as hereinbefore described to the purpose of milling paddy and
other grain by propelling it by means of centrifugal force against the surface of
the said casing or rim in the manner hereinbefore mentioned.
Dated this 17th day of March 1801
C. F. HODGES,
Attorney for Charles Gairdner and Robert Ramsay.