IMPROVEMENTS IN APPARATUS EMPLOYED IN MILLING OR IN THE MANUFACTURE OF FLOUR FROM GRAIN.
Year: 1882

page_text: LETTERS PATENT to James Harrison Carter of Mark Lane in the City of
London for an Invention of "IMPROVEMENTS IN APPARATUS EMPLOYED IN
MILLING OR IN THE MANUFACTURE OF FLOUR FROM GRAIN.'
(Void by reason of the Patentee having neglected to file a Specification in
pursuance of the conditions of the Letters Patent.)
i
PROVISIONAL. SPECIFICATION left by the said James Harrison Carter at
. the Office of the Commissioners of Patents on the 6th December 1882:
JAMES HARRISON CARTER of Mark Lane in the City of London
IN APPARATUS EMPLOYED IN MILLING OR THE MANUFACTURE OF FLOUR FROM
GRAIN.
•
"6
IMPROVEMENTS
This Invention has for its object improvements in apparatus employed in
milling.
In roller milling it is usual to purify the semolina, the product of the earlier
processes, by causing it to descend by gravity through channels which are crossed
by currents of air.
I arrange such apparatus in the following manner:-for each separation I
provide as heretofore a passage communicating with a trunk in connection with a
fan and a current of air is drawn into the trunk through the passage.
I make these separating passages with sides which are parallel for a considerable
distance so that the air passing through the passage is brought to a uniform speed
and direction. The separating passage is inclined, the semolina is dropt in at the
top and descends by gravity. In its descent the semolina meets the wind and those
particles are removed which the uniform stream of air is able to carry upwards and
Into the trunk. At the lower end of the first separating passage the semolina falls
through a mouth which is too narrow to allow much wind to pass and descends by
widening conducting passage to a second separating passage through which also
t passes and so on for as many separations as the machine is intended to effect
so construct the machine that I can adjust the separating passages by separating
r approaching their parallel sides At the points where the passages open into
be trunk I provide valves by which the force of the air streams can be regulated.
[Price 2d.]

page_text: Another machine which I employ for purifying semolina consists of a slightly
inclined shoe to which a vibratory. notion is imparted. Through the shoe from end
to end a parallel air passage is provided and air is drawn through it from the lower
towards the upper end by a fan. The semolina is fed in a regular manner into the
air passage at a distance from its upper end. The air carries out the impurities
from the upper end of the passage and the purified semolina escapes at the lower
end I sometimes also mount sieves upon the shoe to sort the semolina into sizes.
In purifying finer semolina or middlings silken sieves are employed. I construct
such purifiers each with two flat sieves side by side, they are jogged by cranks or
eccentrics on a shaft running at a high speed and to reduce oscillations the
arrangement is such that the movements of the sieves are equal and opposite.
In order that the inclination of the sieves may be readily adjusted to regulate
the speed of the material passing along them I suspend them each by four rods'
from a beam above which can be rocked upon a central fulcrum.
A current of air is drawn up through the sieves by a fan at the top of the casing
in which they are contained.-Beneath the sieves are brushes which are moved
transversely across the under side of the silk in order to prevent it becoming
Brushes
choked. The brushes are actuated by double right and left hand screws.
traversing transversely do not cause that admixture of the different sizes of
semolina which is unavoidable when brushes are traversed longitudinally beneath
sieves carrying several grades of bolting silk.
To separate the dust which passes away with the air current from these and like
machines I cause the fan to discharge into a casing by an opening at the top.
Within this casing I provide two parallel horizontal rollers one near the top and
the other near the bottom and extending completely across the casing. The rollers
carry an endless woollen cloth and as they slowly rotate they carry the cloth round
and round. The only outlet from the casing is at the ends from between the rollers
and the air having to find its way through the thickness of the cloth deposits the
dust on its surface. Underneath the lower roller and within the casing there is a
circular spirally arranged brush which brushes the dust from the surface of the
cloth and leaves it free for further use.
The air when thus strained may be allowed to escape or the outlet from the ai
straining apparatus may be connected with the air inlet to the semolina purifier.
I sometimes construct these machines, with three or more rollers.