Improvements in Machines for Sifting and Purifying Flour, and for other like purposes
Year: 1896

page_text: Date of Application, 26th Oct., 1896
Complete Specification Left, 12th Feb., 1897-Accepted, 20th Mar., 1897
PROVISIONAL SPECIFICATION.
Improvements in Machines for Sifting and Purifying Flour, and for
other like purposes.
We, JAMES HART, of Waisoken Roller Mills, Walsoken, in the County of
Norfolk, Miller, and GEORGE GOTHARD KIDD, Engineer, of Albert Street, Wisbech,
in the County of Cambridge, do hereby declare the nature of this invention to be as.
follows:-
This invention consists of an improved machine and arrangement of parts for
sifting or dressing and purifying flour and other material, the object of the
invention being to produce a sifting or dressing combined with a purifying machine
in one frame.
In carrying our invention into effect we arrange a sifter of the declivity type
and of the rotary sieve class with a number of feeders or funnels at one end of
the frame, and at the other end a number of uptakes or troughs which lead away
to the stive room. We form the bottom of our sifter with a sloping or tapered
end leading from a generally tapered or inclined, end table, and above this bottom
table we mount a sifting screen formed by a number of frames or sieves with
divisions arranged of any desired degree of fineness, the frames being covered
with silk, gauze, wire or other material to suit the stock which is to be operated
upon.
The number of sieves and the arrangement of the frames we vary to suit the size of
machine and the capacity of the mill to which it is to be applied.
Within the sloping bottom of the machine we form a number of holes with
draught inlets and we arrange over the projecting tubes placed within these holes,
conical or other caps which act as air or current distributors or deflectors and also
prevent the finished material from filtering through the bottom of the machine.
The draught apertures thus formed in the bottom of the case and arranged beneath
the sieve or sieves, convey the current of air to the underside of the sieves, where
it passes through the material on the sieve so that the impurities are taken by the
draught to the stive room or elsewhere as required.
The draught or current may be produced from the main fan in the mill or by other
mechanical means, connected when so desired to each screen, suitable regulating
valves being introduced on each division of the sifter, for allowing a strong or weak
draught according to the stock which is to be purified. At the lower end of our
sloping bottom of the machine we place outlet troughs for conveying the material
away.
We mount the machine in a peculiar manner upon corner supports or legs of a
sufficient height to give the desired declivity from one end to the other, and upon
each standard or support we form a saucer or cup bearing having a spherical support
in the form of a ball of india-rubber or other suitable substance, this ball working in
a similarly formed upper saucer or hollowed cap which has a race or curvature
sufficiently large to suit the rotary motion given to the frame by the throw of
the crank pin in the disc placed beneath the frame for giving the necessary motion to
the sifter.
We drive the central disc for giving the necessary motion to the sifter by means
of belting, gearing or other ordinary devices, and we convey motion from the disc pin

page_text: by means of a lever acting upon a ratchet wheel and spindle to a number of cams
or strikers formed upon the spindle of the ratchet wheel, which cams are caused to
strike against the free end of a number of springs so that when the springs are
released they may impart a blow to a lath of wood or to some other part of the
framework so as to keep the sieves clean and prevent clogging.
We may convey the motion to the spring strikers by other ordinary gearing
instead of by a lever operated by a cam or hevel collar on the disc pin, the object
being in each case to produce a motion which will cause the impact upon the underside
of the sieve frame due to the release of the springs when the cams have depressed
them.
The upper part of our framework we make in any suitable manner, placing uptakes
in the form of spouts or troughs suitable for conveying or making connection for
conveying impurities away to any desired position.
We do not limit the application of our invention to any particular shape of
framework or to any particular arrangement of sieves or method of driving the central
shaft, but we modify the shape of the framework and the method of communicating
the motion to suit any particular size or form of machine which is to be produced
and to which our improvements can be adapted to suit the particular material which
is to be operated upon.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
Improvements in Machines for Sifting and Purifying Flour, and for
other like purposes.
We, JAMES HART, Miller, of Walsoken Roller Mills, Walsoken, in the County
of Norfolk, and GEORGE GOTHARD KIDD, Engineer, of Albert Street, Wisbech, in
the County of Cambridge, 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 :-
This invention consists of an improved machine and arrangement of parts for
sifting or dressing and purifying flour and other material, the object of the invention
being to produce a sifting or dressing combined with a purifying machine in one
frame.
In the accompanying sheet of illustrated drawings ;--
The figure is a sectional elevation of our improved machine.
In carrying our invention into effect we arrange a sifter of the declivity type and
of the rotary sieve class with a number of feeders or funnels A A¹ at one end of the
frame and at the other end a number of uptakes or troughs which lead away to
the stive room.
We form the bottom of our sifter with a sloping or tapered end leading from a
generally tapered or declined end table and above this bottom B we mount a sifting
screen formed by a number of frames or sieves with divisions of any desired
size or width, the frames being covered with silk gauze, wire or other material CC¹
to suit the stock which is to be operated npon. The number of sieves C (" and
the arrangement of the frames we vary to suit the size of machine and the
capacity of the mill to which it is to be applied. Within the sloping bottom of the
machine we form a number of holes with draught. inlets D D and we arrange over
the projecting tubes placed within these holes conical or other caps E E which
1

page_text: act as air or current distributors or deflectors and also prevent the finished
material from filtering through the bottom of the machine. The draught apertures:
thrus formed in the bottom or sides of the case and arranged beneath the sieve or
sieves C convey the current of air to the underside of the sieves where it passes
through the material on the sieve so that the impurities are taken by the draught
to the catch tray F or trays, stive room or elsewhere as required.
The draught or current may he produced by the main fan in the mill or by
other mechanical means connected, when so desired to each sieve, suitable regulating
valves being introduced, on each division of the sifter for allowing a strong or weak
draught according to the stock which is to be purified. At the lower end of our
sloping bottom of the machine we place outlet troughs G for conveying the material.
away; the flour passing through G the middlings G' and the tails G. We mount
the machine in a peculiar manner upon corner supports or legs H H¹ of a
sufficient height to give the necessary declivity from one end to the other, and upon
each standard or support we form a saucer or cup bearing K having a spherical
support in the form of a ball L of india-rubber, wood or other suitable substance,
this ball working in a similarly formed upper saucer or cup K' which has a race-
or curvature sufficiently large to suit the rotary motion given to the frame by the
throw of the pin in the disc M placed beneath the frame for giving the necessary
motion to the sifter. We drive the central disc M for giving the necessary motion
by means of belting gearing or other ordinary devices, and we convey motion
from the disc pin by means of a lever acting upon a ratchet wheel and spindle.
to a number of cams or strikers formed upon the spindle of the ratchet wheel
which cams are caused to strike against the free end of a number of springs so.
that when the springs are released they may impart a blow to a lath of wood or to.
some other material so as to keep the sieves clean and prevent clogging. We convey
the motion to the spring strikers by other ordinary gearing instead of by a lever-
operated by a cam or bevil collar on the disc pin, the object being in each case to.
produce a motion which will cause the impact upon the underside of the sieve
frames due to the release of the springs when the cams have depressed them. The
upper part of our framework we make in any suitable manner, placing uptakes in
the form of pipes N spouts, trunks or troughs suitable for conveying or making:
connection for carrying impurities away to any desired position.
We do not limit the application of our method of purification by means of a
direct current of air to the underside of sieve or sieves conveyed by means of
parallel or taper tubes with deflectors of a conical or other shape either in the
bottom, sides or ends of machine, to this class of machine only, but we modify the
arrangement to suit all purifyers, sifters, plansifters, rotaries, centrifugals, warehouse.
separators, graders or smutters.
We do not limit the application of our invention to any particular shape or
framework or to any particular arrangement of sieves or method of driving the
central shaft, but we modify the shape of the framework and the method of
communicating the motion to suit the particular size or form of machine which is to
be produced and to which our improvements can be adapted to suit the particular-
material which is to be operated upon.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is;-
1. The improvements in machines for sifting and purifying flour and for like-
purposes substantially as hereinbefore described and as illustrated in the accompanying.
drawings.
2. In sifting dressing or purifying machines the arrangement for the inlet
distribution and exhaust currents in combination with sieves or screens substantially
as and for the purposes hereinbefore described and as illustrated in the accompanying.
drawings.

page_text: 3. In machines for sifting, purifying and for like purposes, the arrangement of
supporting columns or legs having spherical bearings or carriers mounted between
cupped covers or beds for enabling the necessary vibration to be given to the frame
substantially as herein before described and as illustrated in the accompanying
drawings.
Dated this 19th dox of Fahmiame 1807
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.