IMPROVEMENTS IN ROLLER MILLS FOR CRUSHING MIDDLINGS AND OTHER SUBSTANCES.
Year: 1879

page_text: LETTERS PATENT to Edward Rush Turner and Frederick Turner, both of
Ipswich, in the County of Suffolk, Ironfounders and Engineers, and James
Harrison Carter, of 82, Mark Lane, in the City of London, for the Invention of
"IMPROVEMENTS IN ROLLER MILLS FOR CRUSHING MIDDLINGS AND OTHER
SUBSTANCES.
"
Sealed the 12th December 1879, and dated the 28th June 1879.
PROVISIONAL SPECIFICATION left by the said Edward Rush Turner and
Frederick Turner and James Harrison Carter at the Office of the Commis-
sioners of Patents on the 28th June 1879.
EDWARD RUSH TURNER and FREDERICK TURNER, both of Ipswich, in the County
of Suffolk, Ironfounders and Engineers, and JAMES HARRISON CARTER, of 82, Mark
Lane, in the City of London. "IMPROVEMENTS IN ROLLER MILLS FOR CRUSHING
MIDDLINGS AND OTHER SUBSTANCES."
This Invention has for its object improvements in roller mills for crushing
middlings and other substances. For this purpose we employ three rollers, one
above the other, on horizontal and parallel axes. The bearings of the upper and
lower rollers are carried upon levers which at their outer or free ends are connected
by curved springs formed of steel blades like carriage springs. The springs have
clips applied at the centre, and by screws and nuts upon them any desired strain
can be put upon the springs, increasing their curvature and drawing their ends
together. The nuts have teeth upon their periphories, and worms turned by a
crank handle engage with these teeth. By these means the pressure upon the
rollers is adjusted. Or the levers carrying the bearings of the rollers may be
connected by jointed links to which springs are applied so as to draw them into
inclined positions. The feed, as it is delivered from the feed hopper, is caused to
fall upon a bar of triangular section, which divides it into two parts, which descend
on either side of the bar. One part of the feed is led by inclines between the upper
and the centre crushing rollers, whilst the other part of the feed is led in a similar
manner between the centre and the lower rollers. The crushed material is removed
from the faces of the rollers by scraping blades. One pair of scraping blades is set
immediately in front of the nip of the upper and the centre rollers, another pair is
Bimilarly placed in respect to the nip of the centre and the lower rollers. The
scrapers are mounted upon axes having spring arms, and in each pair of scrapers
these spring arms are coupled together by screws; by the adjustment of these
scrapers can be set to press against the surfaces of the rollers with a suitable
pressure.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Edward Rush Turner and Frederick Turner and James Harrison
Carter in the Great Seal Patent Office on the 27th December 1879.
EDWARD RUSH TURNER and FREDERICK TURNER, both of Ipswich, in the County
of Suffolk, Ironfounders and Engineers, and JAMES HARRISON CARTER, of 82, Mark
Lane, in the City of London. "IMPROVEMEnts in Roller MILLS FOR CRUSHING
MIDDLINGS AND OTHER SUBSTANCES."
This Invention has for its object improvements in roller mills for crushings
middlings and other substances. For this purpose we employ three rollers, one
above the other, on horizontal and parallel axes. The bearings of the upper and
lower rollers are carried upon levers, which at their outer or free ends are connected
by curved springs formed of steel blades like carriage springs. The springs have
clips applied at the centre, and by screws and nuts upon them any desired strain
can be put upon the springs, increasing their curvature and drawing their ends
together. The nuts have teeth upon their periphories, and worms turned by a
crank handle engage with these teeth. By these means the pressure upon the
rollers is adjusted. Or the levers carrying the bearings of the rollers may be
connected by jointed links to which springs are applied so as to draw them into
inclined positions.
The feed, as it is delivered from the feed hopper, is caused to fall upon a bar of
triangular section which divides it into two parts which descend on either side of
the bar. One part of the feed is led by inclines between the upper and the centre
crushing rollers, whilst the other part of the feed is led in a similar manner between
the centre and the lower rollers. The crushed material is removed from the faces
of the rollers by scraping blades. One pair of scraping blades is set immediately
in front of the nip of the upper and the centre rollers, another pair is similarly
placed in respect to the nip of the centre and the lower rollers. The scrapers are
mounted upon axes having spring arms, and in each pair of scrapers these spring
arms are coupled together by screws; by the adjustment of these the scrapers can
be set to press against the surfaces of the rollers with a suitable pressure.
In order that our said Invention may be most fully understood and readily
carried into effect, we will proceed to describe the Drawings hereunto annexed.
Invention.
Figure 2 is a similar view, but with some modifications.
Figure 3 is a front elevation of Figure 2.
a, a, is the frame of the mill, and b, b, b, are the three rollers; they are geared
together by spur wheels on their axes. The bearings of the middle roller are directly
upon the frame, whilst those of the upper and lower rollers are carried upon the
lever c, c, c, c, each jointed at one end to the frame. These levers at their other
ends are coupled by means of the bow springs d, d, and at the centre of each spring
a clipe is affixed; f, f, are screw steins jointed to the clips e, e, and in the arrange-
ment shewn in Figure 1 each stem has upon it a nut with worm teeth upon its
periphory. The nuts can be turned simultaneously by the worms g, g, both on the
axis g', which receives a handle upon its end.
In the arrangement shewn in Figures 2 and 3 the method of approaching the
rollers is somewhat different; the bow springs d, d, are connected by links f. f, to
levers h, h, which at their lower ends are jointed to the frame, and at their upper
are provided with adjusting screws h³, h¹, the ends of which abut upon the frame.

page_text: The levers h, h, have holes or eyes in them, into which eccentrics carried upon the
axis & are received, and this axis serves to connect the levers with the links, the
axis passing through the links, which are double. The construction is clearly shown
by the sectional plan, Figure 4. The axis é carries a handle, and by turning
down this handle the rollers are drawn into contact, but when the handle is raised
they are separated by a small space the one from the other.
The screws h' serve to regulate the pressure, and render it equal at the two ends
of the rollers.
In place of the arrangements we have described above, and shown in the
Drawings, the levers c, o, may be coupled by links, and springs may be applied to
these links. The coupling of the two levers at either end is effected by a pair of
links of equal length jointed together, and each jointed to the outer end of one of
the levers. These links are of such a length that when they are both upright the
rollers b, b, b, are separated by a small distance from each other, but by slightly
inclining the links the rollers are brought into contact. The joints connecting the
links are embraced by a fork having a stem corresponding to the links e, e, in
Figures 2 and 3, but in this case, to supply the requisite elasticity, springs are
interposed between the frame and the bearings of the levers h, h, or some equivalent
arrangement is made. But although this is an arrangement which may be success-
fully resorted to, that shewn by the Figures 2 and 3 is much preferred. The rollers
b, b, b, are provided with blade scrapers k, k, which turn upon centres at k³, k², and
are provided with spring arms k", ", and these arms being drawn together by
screw bolts,, the scraper blades can be caused to bear on the surfaces of the
rollers b, b, with any desired degree of pressure.
The material to be crushed is fed to the rollers from the hopper 2*, which is fitted
at the bottom with a small roller m and a slide n, which can be set nearer to or
further from the surface of the roller. The roller has a pulley m² on its axis, which
receives a belt from a pulley upon the axis of the central roller b, upon which there
is also the belt pulley receiving the driving belt by which motion is given to the
mill. The slide n is raised by means of the notched hand wheel n", which carries
a worm on its axis gearing into a worm wheel on the axis o; upon each end of this
axis o is a pinion gearing into racks fixed to the hopper sides, the axis o turning in
bearings fixed to the slide itself, and rising and falling with it, and so regulating
the feed. Provision is made for locking the hand wheel n" in any position, as the
Drawings show. The feed falls on to an inclined board p, p, which is adjustable by
screws p, p, and thence on to the wedge shaped bar q. By suitably setting the
board the feed may be caused to fall upon the bar g in such a manner as to bo
divided by it into two approximately equal parts. One part of the feed falls upon
the board r, and thence on to the board s, which leads it between the upper and the
middle rollers b, b, by which it is crushed more or less fine according to the adjust-
ment of the rollers. The crushed material is stripped from the rollers by the
scrapers k, and falling into the inclined trough a* it is led away. The other portion
of the feed falls upon the board t, and thence upon the board u, and is led between
the centre roller and the lower of the rollers b, b. It is crushed, and, together with
the material from the upper and middle rollers, is received into the receiver v.
Thus it will be seen that in this mill the amount of the feed, also the division of
the feed between the two crushing points, also the pressure of the crushing rollers
the one on the other, also the pressure of the scrapers upon the faces of the rollers,
are all under the most complete control.
Having thus described the nature of our said Invention, and the manner of
performing the same, we would have it understood that we claim,—
First. The application of bow springs connecting the levers on which the adjust-
able rollers b, b, are carried, and combining therewith apparatus by which the
curvature of the said springs is forcibly increased when it is desired to draw the
rollers together, substantially as described.
Second. The application of links connecting the levers carrying the rollers, and

page_text: combining with the said links springs tending to draw the said links into inclined
positions, and so to approximate the rollers, substantially as described.
Third. The coupling together of the scrapers k in pairs as described, so that the
one scraper supports the other, and an uniform pressure of the scrapers on the two
rollers is maintained.
Fourth. The method of regulating and dividing the feed to the upper and under
sides of the middle roller, substantially as described.
Fifth. The construction of roller mills for crushing middlings and other sub-
stances, substantially as described and illustrated by the annexed Drawings.
In witness whereof, I, the said Edward Rush Turner, have hereunto set my
hand and seal, this Twenty-fourth day of December, in the year of our
Lord One thousand eight hundred and seventy nine.
EDWARD RUSH TURNER
(L.S.)