An Improvement in Roller Mills for Crushing Minerals.
Year: 1888

page_text: Date of Application, 26th June, 1888
Complete Specification Left, 26th Mar., 1899-Accepted, 15th June, 1889
PROVISIONAL SPECIFICATION.
An Improvement in Roller Mills for Crushing Minerals.
I ARTHUR HERBERT WALLIS Engineer of North Hants Iron Works Basingstoke
Hants England do hereby declare the nature of this invention to be as follows :-
1
I construct two metal rollers in a frame with their axles parallel and I fit the
machine with a means of adjustment so that the rollers can be set at any required
distance apart. I cause both rollers to revolve upon their axles by means of belts or
otherwise and at the same time I cause one or both rollers to travel backwards &
forwards for a short distance in a direction parallel to their axles. I do this by means
of any suitable mechanical arrangement. In this way I cause the rollers to wear
evenly and parallel. And what I claim as ny invention is the construction of
rollers revolving on their axles & at the same time having a parallel motion as hercin
described.
Dated this 22nd day of May 1888.
COMPLETE SPECIFICATION.
An Improvement in Roller Mills for Crushing Minerals.
ARTHUR HERBERT WALLIS North Hants Iron Works Basingstoke England,
Engineer I, 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 :-
In crushing Quartz or other Minerals it is often required to reduce them to a
very fine powder & to do this with a roller mill it is necessary that the wear of the
rollers should be as even as possible.
I construct two metal rollers attached to two axles & I place them in a frame, which
frame carries bearings in which the axles turn, the axles of the rollers being parallel
to one another.
1 fit the machine with a means of adjustment so that the faces of the rollers can be
kept parallel and at any distance apart, & this I do by any suitable means now used
for adjusting the distance between spindles running parallel. I cause both rollers to
revolve in a direction opposite to one another by means of belts or gearing, and
at the same time I canso one or both rollers to travel backward and forward in a
direction parallel to their axles.
To allow the rollers this traversing motion 1 either impart the traversing motion
direct to one or both axles and allow the axles to slide in a parallel direction through
their bearings, or I make the bearings which carry one or both axles to slide in guides
and impart the traversing motion to the bearings and through them to the roller or
rollers. To obtain this traversing motion I make use of any suitable means now in
use for giving a backward & forward movement.
I arrange the distance of traverse so that the rollers shall stand clear of each other
at the extreme ends of the traverse, that is that no part of one roller shall be opposite
any part of the other roller at the extreme ends of the traverse, or I give any loss
amount of traverse.
I make the rollers of the same or unequal diameters and I make them the same or
unequal lengths.
The material to be crushed is fed so that it falls between the rollers & to facilitate
this I use any suitable means for feeding the material in, in an even stream of the
width required. I place metal guides to prevent the material as fed into the machine
Price 8d.1

page_text: from falling over the edges of the rollers & so not passing between them, or I construct
the machine without such guides.
The action of the machine is as follows. The two rollers are sot in motion revolving
in opposite directions, in the directions for drawing the material in between the
rollers, & the side traversing motion having been put in action the material which has
to be crushed is fed in so that it falls between the rollers. All the material that falls
between the rollers will then be crushed to the desired fineness, and the cross
traversing motion of the rollers by preventing the same parts of the rollers from
coming opposite each other at every revolution will cause the wear of the rollers to be
comparatively oven.
In order more fully to explain my invention I will refer to the accompanying
drawing.
Two rollers A & B are attached to two axles C & D) which are placed in bearings E
& F&G&H attached to a frame. The hearings G & H are cast solid with the frame
and the hearings E & F slide in the frame and are held in position by set scrows as
shown. The 2 axles are parallel to one another and the distance between them is
regulated by means of the set screws which hold the bearings E & F.
Pulleys J&K are attached to the two axles for driving them.
Roller A has no traversing motion but is held in position by the collars on the axle
ns shown.
The journals of the shaft D are made of sufficient length to allow it to traverse the
desired distance through its bearings.
The pulley K is attached firmly to the shaft 1) and a hollow cap L is attached to
the boss of the pulley thus forming a bearing for the shaft M to revolve in. This
shaft M has a collar attached to one end of it held by the cap L. The axle D with
the cap Lare therefore free to revolve without imparting motion the shaft M, and
the end of the shaft M is kept in contact with the end of the axle D. The shaft M is
carried at the other end by a bearing N and has a Pulley O attached to it for turning
it. This shaft M is constructed with a right & left hand spiral groove cut in it with a
glut working in than in the well known manner for giving a shaft a backward and a
forward traverse as it is turned round. That is to say a right hand spiral groove runs
from P to returning in a left hand spiral groove between the same points, the ends
of the two spiral grooves meeting. A glut R turning on a pivot is placed in the
bearing N which glut fits into the spiral grooves. The grooves are slightly widened
at the ends where the two spiral grooves meet to allow clearance for the glut.
As the shaft is turned it will travel backward and forward in the direction of
its axis.
A casing S is attached over the rollers to which a shoot T is attached, & this
shoot leads the minerals to be crushed to the rollers. This shoot has an opening
of the same width as the roller A which does not traverse. A slide U is placed
under this shoot, having an opening cut through it of the same size as the opening
in the bottom of the shoot T. Two pins are attached to this slide which pins
touch one on each side of the rollor B. The slide thorefore traverses backward
& forward with the roller B. The opening in the slide is the same width ns & is
set central with the roller B and therefore as the slide travels backward and
forward the opening at the bottom of the shoot T to admit the feed, is always open
a distance corresponding to the distance that the rollers overlap each other, and
immediately above the parts overlapping.
The action of the machine is as follows.-The rollers are made to run in opposite
directions as indicated by the arrows W & X by means of belts running on the
pulleys in opposite directions. The shaft M being set in motion by a belt driving
pulley imparts to the roller B a traversing motion, making it alternately travel
from the position shown in dotted lines Y to the position Z and back.
The material to be crushed is fed into the shoot T and falls through the opening in
the bottom of the shoot.
The rollers being set at the desired distance apart the material which passes between
them is crushed to the size required.

page_text: I do not confine myself to constructing the machine in the manner shown in
the drawing, but make use of other suitable means for carrying out my object as
already mentioned.
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
The construction of rollers revolving on their axles and at the same time having
a parallel motion in the manner and for the purpose herein described.
Dated this 95th day of 1000
ARTHUR HERBERT WALLIS.
ARTHUR HERBERT WALLIS.