IMPROVEMENTS IN ROLLER MILLS FOR GRAIN AND ITS PRODUCTS
Year: 1879

page_text: LETTERS PATENT to John Whittier Throop, of No. 5, Aldersgate Street, in the
City of London, for the Invention of "IMPROVEMENTS IN ROLLER MILLS FOR
GRAIN AND ITS PRODUCTS." A communication from abroad by William
Dickenson Gray, of Milwaukee, State of Wisconsin, United States of
· America.
Sealed the 18th April 1879, and dated the 12th February 1879.
PROVISIONAL SPECIFICATION left by the said John Whittier Throop at the
Office of the Commissioners of Patents on the 12th February 1879.
JOHN WHITTIER THROOP, of No. 5, Aldersgate Street, in the City of London.
"IMPROVEMENTS IN ROLLER MILLS FOR GRAIN AND ITS PRODUCTS." A communi-
cation from abroad by William Dickenson Gray, of Milwaukee, State of Wisconsin,
United States of America.
This Invention relates to improvements in roller mills for treating grain and its
products.
It is proposed to give rotation to all the rollers by belts, thereby avoiding the
noise, the jarring of the machine, and the trembling of the mill floor produced by
the use of toothed wheels, rendering the working of the machine more correct, the
grinding evener, increasing the lasting and the life of the rolls, and rendering the
capacity of roller mills a vast deal larger by speeding up rolls to any motion
desired; a countershaft is used to accomplish the reversed motion, and to be the
main shaft for a disintegrator with which it is proposed to furnish some machines.
The disintegrator is shown in Figure 2 of the accompanying two Sheets of Drawing,
and consists of a cylinder revolving with shaft having a great quantity of pins
driven in all around, and outside of a surrounding stationary cylinder having pins
driven in on outside. The countershaft serves moreover to produce any amount of
differential speed of roll surfaces that may be required by means of being mounted
with pulleys of different diameters to those on roll shafts.

page_text: On the accompanying two Sheets of Drawing forming part of this Provisional
Specification,
Figure 1 is a sectional elevation of a roller nill embodying this Invention,
Figure 2 is a plan, and
Figure 3, an end view partly in section thereof.
The driving belt N-is-applied in a manner as shown in Figure.1; it is made to
drive roll C by means of pulley c, and roll E by pulley e, both in one direction, and
the counter shaft Bˇby pulley b in opposite direction. On the other side of the
machine the pulleys b₁ and 62 (Fig. 2) are to communicate their motions to rolls D
_and_F_by_pulleys.d_and_f_by_belts P_and_R_respectively. The feed rolls Hand_G_
are run by small belts set in motion respectively by rolls D and E; it is intended
_to_use_the_countershaft B as a tightener for all belts; it is for that purpose hung in
pivot-boxes that may be lowered by hand screws S (Figure 1-and- Figure-3); or-
the pulleys may be carried on a fixed axle or shaft secured at one end within a
block sliding in suitable guides, or made otherwise moveable for the purpose of
tightening the belts by increasing the distance between the centres of the upper
and lower pulleys; in this case the pulleys would be arranged to revolve freely
upon the said axle, the one carrying the other with it; the rolls E and D are firm,
and rolls C and F are loose; the pressure between the rolls is regulated by spiral
springs U, which are to be set by handscrews T, the boxes for the loose rolls are
allowed only to slide in a horizontal plane by means of the planed slots O marked
in Figure 3.
"
winding" position towards its mate.
Thus a roll can never assume a
Before each sliding box is put a small involute cam or a taper wedge screw Y,
Fig. 1, for the purpose of taking rolls apart when doing no grinding. The involute
cam may be turned with a wrench, or in case of a wedge screw being employed the
screw will effect motion of sliding box by being screwed up.
In Figure 2, C, D, E, F, represent the working rolls, which it is preferred to
make of porcelain, chilled iron, glass, or any silicious matter. To avoid heating of
bearings, a very annoying feature of roller mills, collars are welded to the shafts
(x, x, x, x, in Figures 2 and 3) which are to act as oil-distributors, and as shoulders
for shafts.
At both ends of the boxes ring shaped grooves are provided (v, in Fig. 3). The
lowest part of these recesses is to be connected by an inclined hole (w, in Fig. 3)
with a cavity (z, in Fig. 3) surrounding the collar in ring shape. This cavity is
to receive the oil, and keeps the sides of collars always greased; the collars touching
the unguent, will carry it around, and when the oil is on top it will spread over the
tops of the shaft journal to both directions, thereby reoiling the bearing.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Whittier Throop in the Great Seal Patent Office on the 12th
August 1879.
JOHN WHITTIER THROOP, of No. 5, Aldersgate Street, in the City of London.
"IMPROVEMENTS IN ROLLER MILLS FOR GRAIN AND ITS PRODUCTS." A communi-
cation from abroad by William Dickenson Gray, of Milwaukee, State of Wisconsin,
United States of America.
This Invention relates to improvements in roller mills for treating grain and its
products.
It is proposed to give rotation to all the rollers by belts, thereby avoiding the
noise, the jarring of the machine, and the trembling of the mill floor produced by
the use of toothed wheels, rendering the working of the machine more correct, the
grinding evener, increasing the lasting and the life of the rolls, and rendering the
capacity of roller inills a vast deal larger by speeding up rolls to any motion desired.
A countershaft is used to accomplish the reversed motion, and to be the main shaft
for a disintegrator, with which it is proposed to furnish some machines. The
disintegrator is shewn in Figures 1, 2, and 3, of the accompanying Sheet of Drawing,
and consists of a cylinder revolving with shaft, having a great quantity of pins
driven in all round, and revolving within a surrounding stationary cylinder having
pins driven in on inside. The countershaft serves moreover to produce any
amount of differential speed of roll surfaces that may be required, by means of
being mounted with pulleys of different diameters to those on roll shafts.
On the accompanying Sheet of Drawing forming part of this Specification,
Figure 1 is an elevation of a roller mill embodying this Invention,
Figure 2 is an end view,
Figure 3, a back elevation, and
Figure 4, a plan of same.
Figure 5 illustrates an arrangement for adjusting roller bearings in a vertical or
horizontal plane.
The driving belt M is applied in a manner as shown in Figure 1; it is made to
drive roll C by means of pulley c, and roll E by pulley e, both in one direction, and
the countershaft B by pulley b in opposite direction. On the other side of the
machine the pulleys 61 and 62 (Figure 2) are to communicate their motions to rolls D
and F by pulleys & and f by belts P and R respectively. The feed rolls H and G
are run by small belts set in motion respectively by rolls D and E; it is intended
to use the countershaft B as a tightener for all belts; it is for that purpose hung in
pivot boxes that may be lowered by handscrews S (Figures 1 and 2, and Figure 3),
or the pulleys may be carried on a fixed axle or shaft secured at one end within a
block sliding in suitable guides, or made otherwise moveable for the purpose of
tightening the belts by increasing the distance between the centres of the upper
and lower pulleys. The rolls E and D are firm, that is to say, cannot move hori-
zontally, whereas rolls C and F are loose, and free to do so; the pressure between
the rolls is regulated by spiral springs U, which are to be set by handscrews T.
The boxes for the loose rolls are allowed only to slide in a horizontal plane by
means of the planed slots O marked in Figure 2.
Thus a roll can never assume a "winding" position towards its mate.
Before each sliding box is put a small involute cam, or a taper wedge screw Y,
Figures 1 and 2, for the purpose of taking rolls apart when doing no grinding.
The involute cam or wedge may be turned with a wrench, or in case of a wedge
screw being employed the screw will effect motion of sliding box by being
screwed up.
In Figure 2, C, D, E, F, represent the working rolls, which it is preferred to
make of porcelain, chilled iron. glass, or any silicious matter

page_text: To avoid heating of bearings, a very annoying feature of roller mills, collars are
welded to the shafts (x, x, x, x, in Figure 2) which are to act as oil distributors, and
as shoulders for shafts.
At both ends of the boxes ring shaped grooves are provided (v, in Figure 2) to
receive any superabundant oil squeezed out. The lowest part of these-recesses-is-to-
be connected by an inclined-hole (w, in Figure 2) with a cavity (z, in Figure 2)
surrounding the collar_in_ring_shape. This cavity is to receive the oil, and keeps
the sides of collars always greased, the collars touching the unguent will carry it
around, and when the oil is on top it will spread over the tops of the shaft journal
to-both-directions,-thereby-reoiling_the_bearing..
. Upon referring to Figure it will be seen that the lever O and roll bearing k
can be readily adjusted in a vertical plane by means of the set screws 1, 1, whilst
the hand wheel and spring m-in conjunction with the rod-n-serve to regulate its.
position in a horizontal direction.
Having now described and ascertained the nature of the Invention communicated
to me as aforesaid, and in what manner the same is or may be performed, I would
have it understood that I do not limit myself to the application of my improved
countershaft to a roller mill constructed in every respect as shewn in the Drawing,
as many variations may be made in the details of construction of such mills; but
that what
I claim as secured to me by the hereinbefore in part recited Letters Patent is,―
The use of a countershaft within or on the frame of a roller mill, such counter-
shaft being both tightener for the belts and reverser of motion for two of the rolls
when four are used in a parallel plane, substantially as hereinbefore specified.
In witness whereof, I, the said John Whittier Throop, have hereunto set my
hand and seal, this Eighth day of August, in the year of our Lord One
thousand eight hundred and seventy nine.
Witness,
W. E. GEDGE,
Patent Agent,
11, Wellington Street,
Strand,
London.
J. W. THKOOP. (L.S.)