Improvements in Roller Mills.
Year: 1890

page_text: Date of Application, 27th Oct., 1890-Accepted, 13th Dec., 1890
Improvements in Roller Mills.
A communication from ARTHUR MOORE, of No. 91, Bloor Street West, in the City of
Toronto, Canada, Merchant Miller.
I, CHARLES AUBREY DAY, of 321 High Holborn, in the County of London, Fellow
of the Institute of Patent Agents, 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:-
The object of the invention is first, to arrange the rolls so that they shall operate
in conjunction with each other with a steady motion, the distance between the rolls
being readily adjusted to the finest nicety, secondly, to arrange the feed so that the
wheat shall be evenly distributed over the full length of the roll, and thirdly, to
arrange a rope-drive so as to operate satisfactorily to drive the fast roll and to brake
the slow roll, with the least possible tension on the rope; and it consists, first, of a
wedged-shaped block located between the hearing-boxes of the rolls, the said wedge-
shaped block being operated by a screwed spindle, while the bearing-boxes are other-
wise held so that each roll shall operate without the slightest chattering or vibration,
secondly, of a vertical stop-board held by arins pivoted to a stationary part of the
machine, the said arm being notched so that the stop-board may be moved to or
farther from the edge of the vibrating fluted feed-board, and thirdly, of two ropes
located one on each side of the machine, each rope extending from the main driving
pulley to a pulley fixed on the shaft of the slow roll of one pair, thence upon an
idler or guiding pulley, thence around the pulley of the fast roll, and finally back to
the main driving pulley, the whole being constructed in detail, substantially as
hereinafter more particularly explained.
Figure 1 is a perspective view of my improved roller mill broken away in parts
to expose its interior construction.
Figs. 2 and 3 are enlarged sectional details showing my improved means for
adjusting and holding the bearing-boxes of the roli.
Fig. 4 is a cross section showing the parts of the feed in which my improvements
are involved.
Fig. 5 is a side view showing my improved rope-drive.
As both pairs of rolls are arranged the same it will be sufficient for the purpose of
the first portion of this Specification to describe the mechanical parts connected with
one pair of rolls.
A is the upper or fast roll suitably journalled in a bearing-box B.
C is the lower or slow roll suitably journalled in a bearing-box D.
E is a wedged-shaped block placed between the bearing-boxes B and D), the bottom
of the bearing-box, B, being bevelled to correspond and rest against the taper of the
block E.
F is a spindle connected with the top of the box, B, and extending through the
cap, G, which is bolted to the top of the jaws H. A collar, I, is loosely fitted on to
the spindle F and is provided with a handle J.
The bottom surface of the collar, 1, is inclined or cam-shaped and corresponds
inversely in shape with the stationary hub, K, cast upon or fixed to the cap, G.
L is a powerful spring placed on the spindle, F, between the bearing-box, B, and
the cap, G, the said spring being designed to give the necessary elastic pressure
against the top roll, A.
It is scarcely necessary to add that a corresponding spindle and the parts described
are provided for each end of each top roll. When it is necessary to raise the top roll
clear of its mate the handle, J, is moved so as to force the collar, I, up to the
inclined surface formed on the hub, R.

page_text: By placing the wedge-shaped block, E, between the bearings of the upper and
lower rolls the pressure directed on to the top of the upper roll is conveyed with equal
force on to the bearings of the lower roil, both rolls being thus held with absolute
rigidity which effectually prevents the vibratory or chattering motion of either of
the rolls thus ensuring an even and regular grind.
Owing to the wedge-shaped block E, and the means provided for adjusting it, it
will be seen that the distance between the rolls may be instantly adjusted to the
greatest nicety.
On reference to Figs. 2 and 3 it will be observed that each bearing box is provided
with a cap or block M, fitted on to the spindle of the roll and made so that its
bottom will not come in contact with the top of its bearing-box. This cap or block
is supported by screw-bolts, N, which are adjusted so as to allow the said cap or block
to be held against the spindle of the roll by the pressure directed by the pinch-
screws, O. This arrangement provides easy means for adjusting the cap or block to
give the necessary pressure against the bearings. In order to prevent any lateral
movement of the bearing-box, B, which must be capable of moving vertically while
the machine is in operation I provide a check-block P, which is adjusted against the
side of the box B, by means of the pinch-bolts, Q and screw-bolts R.
With a view of providing easy means for the removal of the rolls 1. bolt the out-
side jaws, H to the frame of the machine. It is therefore merely necessary to
remove the bolts, S, raise the cap, G, and remove the spindle, F, when the said jaw
may be removed.
The
On reference to Figs. 1 and 4 my improvement in the feed will be seen.
feed-board, T, is supported in such a way that it may be removed horizontally. Some-
times it is necessary to impart a vibratory side movement to this feed-board and
sometimes a vibratory end motion must be given to it. In the drawing 1 show
mechanism for imparting both of these movements, but it will of course be understood
that only one movement at a time will be used. In order to give the end vibratory
movement I connect the feed-board, T, by spring rods, U, to eccentrics, V, fixed to
the shaft, W, which derives a rotary motion from some convenient moving part of
the machine. In order to give the side vibratory motion to the feed-board, T, i
provide a pin on the bottom of the said feed-board, T, which fits between two cam-
shaped blocks, X, fixed to the shaft, Y, which derives a revolving motion from one
of the rolls, A, as indicated in Fig. 1.
Z, is a board provided with arms, a, having a series of notches made on their
bottom edge, the said notches being designed to fit over the catches, b, which are
fixed to a stationary part of the machine. By means of these notches the board Z
may be moved nearer to or farther from the edge of the feed-board, T. The
farther the board, Z, is moved from the edge of the feed-board, T, the lighter
will the said board, Z, rest upon the feed-board, T, and the nearer the stop-
board, Z, is moved to the edge of the feed-board, T, the heavier will be the
pressure of the said board, Z, on the said feed-board, T. By thus adjusting the
stop-board, Z, the resistance which it will offer to the stream of grain may be
increased or decreased as desired to spread the grain in accordance with the
judgement of the miller.
On reference to Fig. 5 my improved system of rope-drive will be seen. In this
figure I show the rope-drive on one side of the machine the duplicate pair of rolls
being similarly driven on the opposite side. In this figure I show the main driving-
wheel, 6, which is not shown in the other figures of the drawing, as it is usually placed
below the floor on which the machine stands. We will assume that this pulley is
revolving in the direction indicated by arrow in which case the rope, d, will travel in
the direction indicated by arrow which directs it to a pulley, f, fixed to the axle of
the lower slow roll, C. After passing around this pulley which revolves as indicated
by arrow, the rope, d, passes down around the idler or guiding pulley, e, thence up
and around a small pulley, g, fixed to the shaft of the fast roll, A, and thence back
to the main-driving pulley, 6. It will be observed that this single rope drives the
slow roll, C, on one pair and the fast roil, A, on the other pair of rolls, and the

page_text: corresponding rope on the other side drives the other or duplicate pair of rolls not
driven from the side shown in the drawing, so that both top rolls, A, revolve fast
while the bottom rolls, C, revolves slowly. It is of course understood by all millers
that the friction of the stock passing between the rolls has a tendency to cause the
slowly revolving roll, C, to revolve as quickly as its fast revolving mate. This
tendency is checked by the arrangement described of my rope-drive. As before
stated the rope, d, when it leaves the pulley, 6, passes around the pulley connected to
the slow roll, C, consequently the portion of the rope extending between the pulley, 6,
and the pulley on the roll, C, should be the loose side of the rope-drive, but as the
fast roll, A, running in connection with the roll, C, now referred to, forces the roll, C,
beyond its proper speed, the portion of the rope extending between the pulley, 6,
and the pulley on the roll, C, is tightened and acts as a brake to hold back the speed
of the roll, C, which is thus kept at its regular speed called for by the size of the
pulley.
A result of my system of drive is an absence of friction on the guide or tightening
pulley and a consequent or corresponding saving of power, as the rope both going
from and returning to the driving pulley is tight, i.e., working, or both sides are
working sides. The rope is slack both going on to and coming off the guide pulley.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. In a roller mill, the combination with the bearing-boxes of each pair of rolls,
of adjustable wedge-shaped blocks located between the said bearing-boxes and
operated by a screwed spindle, substantially as and for the purpose specified.
2. In a roller mill, the bearing-box of the top roll having a spindle connected
to it arranged to pass through a cap or stationary part of the frame having a cam-
faced hub formed on it surrounding the said spindle in combination with a collar
fitted into the said spindle and having a cam-shaped face to correspond with the cam-
shaped face of the hub, and of a spring located between the said bearing-box and the
cap or stationary part of the frame, substantially as and for the purpose specified.
3. In a roller mill, the bearing-box of a roll fitted between the jaws of the frame,
in combination with the cheek-block located between the side of the bearing-box and
one of the jaws, the said cheek-block being adjusted by means of screw-bolts and
pinch-screws, substantially as and for the purpose specified.
4. In a roller mill, the bearing-box supporting the roll, in combination with a
block fitted on to the journal of the roll and adjustably held by screw-bolts and pinch-
screws, substantially as and for the purpose specified.
5. In a roller mill, a vibrating feed-board in combination with a stationary stop-
board supported by arms having notches to fit on to stationary catches by which the
said stop-board may be adjusted, substantially as and for the purpose specified.
6. In a roller mill, the combination with the bearing-box of the rolls, of adjustable
check-plates arranged substantially as and for the purpose specified.
7. In a roller mill, a rope-drive in which the rope is conveyed from the main-
driving-wheel round the pulley of the slow roll of one pair, thence round an idler or
guiding pulley, thence round the pulley of the fast roll of the other pair of rolls, and
back to the main driving pulley, substantially as and for the purpose specified.
Dated this 27th day of October 1890.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicant.