IMPROVEMENTS IN ROLLER MILLS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said John Qualter at the Office
of the Commissioners of Patents on the 13th February 1882.
JOHN QUALTER, of the Railway Foundry, Barnsley, in the County of York,
Engineer. "IMPROVEMENTS IN ROLLER MILLS."
Roller mills as at present constructed are mostly complicated and expensive and
are usually driven by gearing liable to break or get out of order.
It is to provide a simple and effective mill suitablo (and modified accordingly)
for reducing or pulverizing middlings sharps or other meals or grain or seeds,
salt, slack, coal or other matters capable of reduction by rollers that my Invention
is designed.
I provide a suitable frame bedplate or casing in which I mount a pair of smooth
rollers on the axis of one of which I place a pulley or other device for transmitting
driving power. These rollers thus run together the one (by friction) driving the
other. I advantageously make the bearings of both adjustable the one by screw
or otherwise and the other by means of a C or other suitable spring and hand-
wheel or otherwise.
Below each of these main rolls I place one or more smaller rolls carried on the
ends of pivotted levers adjustable as to pressure by sliding counterweights or by
springs. These again are driven by friction off the main rolls and by their adjust-
ment the material to be operated upon may be reduced to any degree of fineness,
as it passes between the main rolls and again between the smaller ones. The elastic
adjustment allows of a stone or other obstruction passing without injuring the
machine:
When the material is supplied from a hopper I may place a regulating slide or
valve connecting with a governor running on a shaft furnished with a wheel or

page_text: vane driven, by the fall of the reduced material so that the supply to the mill is
automatically governed by the discharge therefrom.
For reducing middlings and the like one or both or all the rolls may be of
porcelain or vitreous material or they may be of chilled iron or steel or other
substance.
It is obvious that I may considerably vary the details of my Invention without
departing from the principle thereof.
For instance in using the mill as a coal crushing machine I may just break the
large coal by one or more pairs of geared fluted or corrugated rolls and then feed
to my smooth friction-driven rolls. In some cases I may drive the main rolls by
belts at varying speeds.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Qualter in the Great Seal Patent Office on the 12th August
1882.
JOHN QUALTER, of the Railway Foundry, Barnsley in the County of York,
Engineer, IMPROVEMENTS IN ROLLER MILLS.
Roller mills as at present constructed are mostly complicated, and expensive and
are usually driven by gearing liable to break or get out of order.
It is to provide a simple and effective mill suitable (and modified accordingly)
for reducing or pulverizing middlings sharps or other meals or grain or seeds salt
slack, coal or other matters capable of reduction by rollers that my Invention is
designed.
I provide a suitable frame bed plate or casing in which I mount a pair of
smooth rollers on the axis of one of which I place a pulley or other device for
transmitting driving power. These rollers thus run together the one (by friction)
driving the other.
I advantageously make the bearings of both adjustable the one by screw or
otherwise and the other by means of a C or other suitable spring and hand
wheel or otherwise or one can be adjustable and the other run in rigid
bearings.
Below each of these main rolls I place one or more smaller rollers carried on the
ends of pivoted levers adjustable as to pressure by sliding counterweights or by
springs or adjusting screws. These again are driven by friction off the main rolls
and by their adjustment the material to be operated upon may be reduced to any
degree of fineness as it passes between the main rolls and again between the smaller
ones. The elastic adjustment allows of a stone or other obstruction passing without
injuring the machine.
When the material is supplied from a hopper I may place a regulating slide or
valve connecting with a governor running on a shaft furnished with a wheel or
vane driven by the fall of the reduced material so that the supply to the mill
is automatically governed by the discharge therefrom, or any other feeding device
may be used as I do not in this Specification lay claim to this or any other method
of feeding.
It is obvious that I may considerably vary the details of my Invention without
departing from the principle thereof.
For instance for using the mill as a coal crushing machine I may just break the
large coal by one or more pairs of geared fluted or corrugated rolls and then feed
to my smooth friction-driven rolls. In some cases I may drive the main rolls by
belts at varying speeds and where the reduced material requires a disintegrating
rather than a grinding action I may cover the peripheries of one or both of the
small rolls with hard steel wire like a rotary brush.
And in order that my Invention may be understood by millwrights and others
and carried into practical effect I have annexed to this Specification the accom-
panying two Sheets of Drawings and to the figures and letters of reference marked
thereon I now refer.

page_text: On Sheet 2. Fig. 3. is a section through the hopper clearly shewing all the rolls
in elevation.
On Sheet 2. Fig. 4. is a plan of the auxiliary rolls.
A is a suitable foundation or bed-plate carrying the framing B OC' are the
main rolls C carrying a pulley for receiving transmitted power and with a fly
wheel D on the other side of its spindle to equalize the driving.
As shewn the bearings of this roll are adjustable by screws E E'.
To set up the roll against C I provide a carriage or other suitable springF
adjustable by hand wheel G.
H is the hopper I the feed shaft and J a spur wheel on same driven by pinion K
on the shaft of roll C or otherwise.
As shewn the shaft I is formed with ribs L bolted or strung on which agitate
the material in the hopper and assist the passage of the same to the rolls.
Below the main rolls are the auxiliary rolls M M¹ running with or on their
spindles N N carried by the counterweighted levers.
For convenience of construction I have shewn these lovers as composed of pivoted
shafts O O' carrying cranks P P¹ at the ends to receive the spindles N N of the
rolls and with the bars or extensions Q Q Q¹ to carry the counterweights R R¹ R'
keyed or fixed to such shafts O O¹
Instead of weights springs might be used.
To clear the adjusting screw G I have placed two lighter bars Q' Q on shaft O¹
equal to the weight of bar Q and its counterweight but I may arrange the mill so
that the levers are equal if desired.
Bearings S S S¹ S₁ carry shafts 0 0'.
In some cases I may drive the rolls CC' by belts or gearing instead of frictionally
say in such cases where the rolls should not touch as for example in reducing
middlings. In this case they might be of porcelain and the auxiliary and
frictionally-driven rolls of such a material as would run against the porcelain
without injury as for instance hard wood.
•
For other purposes the entire train may be of chilled iron or such other materials
as found necessary. The auxiliary rolls thus reduce the already crushed material
to a finer state and this degree of comminution can be regulated by adjusting their
degree of pressure against the main rolls.
Having now described the nature of my said Invention and the manner of
performing the same I would have it understood that I do not claim the rolls C C¹
and their adjustment or the driving of the same by friction or otherwise but what
I claim is
The small or auxiliary rolls carried by pivoted weighted levers in combination
with and driven by friction off the main rolls as and for the purposes described.
In witness whereof I the said John Qualter have hereunto set my hand
and seal this Seventh day of August 1882.
TATTA OTTAT MED