IMPROVEMENTS IN ROLLER-MILLS FOR GRINDING to be as follows:
Year: 1884

page_text: I JOHANNES WEBER-ROTHMUND, Manufacturer, of Uster, Switzerland, do hereby
declare the nature of my said invention for "IMPROVEMENTS IN ROLLER-MILLS
FOR GRINDING to be as follows:-
"
This invention relates to an improved arrangement of grinding-mill with spring
pressure, whereby in case of the gear becoming disarranged through obstruction
of the grinding rollers or feed rollers for instance, the pressure with which the two
grinding rollers are pressed against each other can be relieved by operating a handle
and at the same time the feed is stopped so that not only can the grinding rollers
revolve without performing any work but none of the grain to be ground can pass
between the rollers without being ground; the feed and grinding rollers can again
be thrown into gear by means of the said handle. Also by this arrangement the
relieving of the rollers from pressure and the stopping of the feed may be effected
automatically when all the grain shall have been ground and the feed hopper is
empty. Further, means are provided for quickly, easily, and exactly setting the
feed slide.
For this purpose, during the operation of grinding, the upper and lower grinding
rollers are pressed against one another with a certain pressuro by means of a spring..
By means of a double nut on a pressure bolt this pressure can be regulated according
to the grain to be ground. On one side of the standard of the mill the pressuro
bolt is connected with the lower forked end of a levor handle; the lever handle is
firmly connected by a horizontal rod to a lever on the other side of the standard
of the mill and corresponding with the lower part of the lever handle. Pins connect
the pressure bolts with their respective levers. The horizontal rod is carried at
each end by a link which links oscillate on pins fixed to the standard of the
machine. The centres of the pins connecting the pressure bolts with their levers
and of the pins on which the links oscillate are so placed with reference to the
horizontal rod that if the lever handle be moved from the left to the right hand an
upward movement of the pins of the pressure bolts and their levers by which the
pressure springs are released is effected.
The arrangement of levers where the grinding rollers are placed side by side is
similar to that herein before described with the exception that another lever to
operate one of the pressure bolts and a connecting rod are required; the lever
handle oscillates on a fixed axis and the transmission of the movement of the lever
handle from one side of the machine to the other is effected by a shaft and a cam
the shape of the latter corresponding with the shape of the lower part of the lever
operating the pressure bolt on the other side of the mill.
By the hereinbefore described arrangement of levers the throwing out of gear
of the rollers is easily effected as the levers are proportionate to the varying
pressure. To the lever handle is also linked a connecting rod which is connected

page_text: with a crank fixed on the shaft of the feed roller. Over the boss of this crank a
collar is passed which is provided with a curved slot or groove, so that when the
lever oscillates this collar will be moved in an axial direction. In order to prevent
the collar from turning with the crank a projection on the collar comes against a
pin fixed to the standard of the mill; this movement of the collar causes a key in
a slot in a pulley and pivotted at one end, to enter or come out of a slot in the
shaft by means of an inclined surface with which the key is provided, so that the
said pulley which is driven by a pulley fixed on one of the grinding rollers is thrown
into or out of gear with the feed roller. If therefore the grinding rollers be put
out of working position by rocking the lever handle, the key will at the same time
be drawn back into the slot of the shaft, the pulley will run loose and the feed
roller will be stopped. Instead of the hereinbefore described key a clutch or
friction coupling may be employed for connecting the pulley with the shaft of the
feed roller.
In cases where the grinding rollers are placed side by side, the putting the
rollers out of working position which takes place at the same time as the throwing
out of gear of the feed roller, is effected by disengaging a clutch which enters the
pulley. For this purpose a projection is provided on the lever handle, which
projection by means of a fork, throws out of gear the clutch which couples the
pulley and the feed roller. If the lever handle be.in.the position which it occupies
when the grinding rollers are pressed one against the other it will allow the clutch
to gear with the cogs of the pulley by means of a weight on the disengaging fork.
The herein before described arrangemont thus allows of releasing the pressure
spring and stopping the feed and of bringing the same again into action by means
of a handle in an easy and expeditious manner.
The hereinbefore described throwing out of gear of the grinding rollers and feed
roller is also effected automatically as soon as the height of the grain in the hopper
has diminished sufficiently to allow a hinged flap fixed on the inside of the hopper
to project inwards; this is effected by a spring and. at the same time a stay or
support provided with a projection is caused to descend by means of a connecting
rod whereby a rack fixed on the lever handle is deprived of support and drops on a
toothed wheel keyed on the shaft of the feed roller; the rack is consequently inoved
towards the right hand side and throws the lever handle out of gear whereby the
grinding rollers are relieved from pressure and the feed roller is thrown out of
gear. When the feed hopper is full the lever handle can be moved at will as the
rack will slide on the stay or support.
It will be evident that this arrangement may also be employed in a mill having
the grinding rollers placed side by side.
The regulation of the feed slide is effected by moving a handle to the right hand
side for instance if it be required to raise the slide; a rod is thereby caused to move
in guides which are fixed on the hopper, and guiding pieces fixed on the slide are
lifted. A set screw with a sliding spring secures the rod in position. An accurate
sotting of the slide so that its lower edge shall be parallel with the feed roller is
easily effected by means of a screw, as the length of the link connecting the rod
with the slide can be thereby altered for this purpose.
If the slide be lifted in order to empty the hopper, a set screw with which the
rod is provided will, when the slide is again lowered act as a stop, thereby
maintaining the height of the opening the same as it was before.
It will be obvious that the herein before described arrangements may be employed
in grinding mills in which the rollers are pressed against one another by means of
weights and levers,

page_text: I JOHANNES WEBER-ROTHMUND Manufacturer of Uster, Switzerland do hereby
declare the nature of my said invention for "IMPROVEMENTS IN ROLLER-MILLS FOR
GRINDING "and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
This invention relates to an improved arrangement of grinding-mill with spring
pressure whereby in case of the gear becoming disarranged through obstruction of
the grinding rollers or feed rollers for instance, the pressure with which the two
grinding rollers are pressed against each other can be relieved by operating a
handle and at the same time the feed is stopped so that not only can the grinding
rollers revolve without performing any work but none of the grain to be ground
can pass between the rollers without being ground; the feed and grinding rollers
can again be thrown into gear by means of the said handle. Also by this arrange-
ment tho relieving of the rollers from pressure and the stopping of the feed may be
effected automatically when all the grain shall have been ground and the foed
hopper is empty.. Further means are provided for quickly, easily and exactly
setting the feed slide.
In order to enable the invention to be fully understood I will proceed to describe
the same by reference to the accompanying drawing in which fig 1. is a front
elevation partly in section of the upper portion of a roller mill for grinding having
superposed rollers and constructed according to this invention; fig 1 is a detached
sectional view of part of the same; fig 2. is a vertical cross section through the
hopper and grinding rollers of the machine and fig 3 is a vertical cross section on
line A B of fig 1; figures 4 and 5 are similar views to figures 1. and 2. but showing
the improvements applied to a mill having the rollers arranged side by side;
figure 6 is a vertical cross.section on line C. Ď. of figure 4. In figures 4. 5 and 0.
capital letters are used to indicate similar parts represented by small letters in
figures 1. 1 2. and 3.
For the herein before described purpose, during the operation of grinding, the
upper and lower grinding rollers i i are pressed against one another with a certain
pressure by means of a spring h. By means of a double nut oo on a pressure.
bolt n this pressure can be regulated according to the grain to be ground. On one
side of the standard of the mill the pressure bolt n is connected with the lower
forked end of a lever handle k; the lever handle k, is firmly connected by a
horizontal rod to a lever k¹, on the other side of the standard of the mill as shewn
in figure 1. and corresponding with the lower part of the lover handle k. Pins
shewn at m connect the pressure bolts n with their respective levers k and k¹. The
horizontal rod is carried at each end by a link p which links oscillate on pins q
fixed to the standard of the machine. The centres of the pins m, connecting the
pressure bolts n, with their levers k k' and of the pins g on which the links p,
Oscillate are so placed as shown in figures 2 and 3 with reference to the horizontal
rod l, that if the lever handle k be moved from the position shewn in dotted lines
in figure 2 towards the right hand into the position shewn in figure 3 an upward
movement of the pins m, of the pressure bolts and their levers k and is effected
by which the pressure springs are released as shewn in figure 8.

page_text: The arrangement of lovers where the grinding rollers are placed side by side as
shown in figures 4, 5, and 6 is similar to that herein before described with the
exception that another lever W to operate one of the pressure bolts N and a
connecting rod U are required; the lever handle K oscillates on a fixed axis and
the transmission of the movement of the lever handle K from one side of the
machine to the other is effected by a shaft V and a cam W; the shape of the latter
corresponding with the shape of the lower part of the lever W.
In figure 5 the levers K, U, W and W' are shewn in working position whilst in
figure 6, the said levers are shewn in the position they occupy when the rollers are
out of gear.
By the herein before described arrangement of levers the pressing the rollers one
against the other is easily effected as the levers are proportionate to the varying
pressure. To the lever handle k is also linked a connecting rod ? figures 1 to 3
which is connected with a crank s fixed on the shaft of the feed roller. Over the
boss of this crank a collar t is passed which is provided with a curved slot or groove
so that when the lever k oscillates as shewn in figure 3 this collar t will be moved
in an axial direction. In order to prevent the collar t from turning with the
cranks a projection on the collar t comes against a pin fixed to the standard of
the mill; this movement of the collar causes a key ts in a slot in a pulley t³ and
pivotted at one end, to enter or come out of a slot in the shaft by means of an
inclined surface with which the key t³ is provided, so that the said pulley which is
driven by a pulley fixed on one of the grinding rollers is thrown into or out of
gear with the feed roller. If therefore the grinding rollers be put out of working
position by rocking the lever handle from the position shewn in figure 2 to that
shewn in figure 3 the key will at the samo time be drawn back into the slot of
the shaft, the pulley t will run loose and the feed roller will be stopped. Instead
of the key to a clutch or friction coupling may be employed for connecting the
pulley with the shaft of the feed roller.
In cases where the grinding rollers are placed side by side, the putting the
rollers out of working position which takes place at the same time as the throwing
out of gear of the feed roller is effected by disengaging a clutch which enters the
pulley. For this purpose a projection R is provided on the lever handle K which
projection by means of a fork S throws out of gear the clutch which couples the
pulley T and the feed roller. If the lever handle K be in the position which
it occupies when the grinding rollers are pressed one against the other it will allow
the clutch to gear with the cogs of the pulley by means of a weight S¹ on the
disengaging fork S. The herein before described arrangement thus allows of
releasing the pressure spring and stopping the feed and of bringing the same again
into action by means of a handle in an easy and expeditious manner.
The herein before described throwing out of gear of the grinding rollers and feed
roller is also effected automatically as soon as the height of the grain in the hopper
has diminished sufficiently to allow a hinged flap u, figures 1 and 2 fixed on the
inside of the hopper to project inwards, this is effected by a spring v, and at the
same time a stay or support a, provided with a projection is caused to descend by
means of a connecting rod w, whereby a rack y, fixed on the lever handle k, is
deprived of support and drops on a toothed wheel z, keyed on the shaft of the
feed roller: the rack is consequently moved towards the right hand side as shown
in figure 3 and throws the lever handle k, out of gear whereby the grinding rollers
When the
are relieved from pressure and the feed roller is thrown out of gear.
feed hopper is full the lever handle k, can be moved at will as the rack y, will sli·le
on the stay or support x.
It will be evident that this arrangement may also be employed in a mill having
the grinding rollers placed side by side as in figures 4 and 6 in which this arrange-
ment is omitted for the sake of clearness.
The regulation of the feed slide a, figs: 1 and 2 is effected by moving a handle b,
to the right hand side for instance as in figures 4 and 5 if it be required to raise
L
H uides which are fixed on the

page_text: bopper, and guiding pieces d, fixed on the slide a, are lifted. A set screw E
figure with a sliding spring secures the rod c, in position. An accurate setting of
the slide so that its lower edge shall be parallel with the feed roller is easily
effected by means of a screw f, as the length of the link connecting the rod c, with
the slide a, can be thereby altered for this purpose.
If the slide be lifted as shewn in figures 4 and 5 in order to empty the hopper a
set screw g with which the rod is provided will when the slide is again lowered act
as a stop thereby maintaining the height of the opening the same as it was before.
It will be obvious that the bereinbefore described arrangements may be employed
in grinding mills in which the rollers are pressed against one another by means of
weights and levers.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. In roller mills for grinding, the arrangement for releasing the pressure springs
or weights and simultaneously stopping the feed the said arrangement consisting of
the handle k, rod, lever k, link p, bolt n, connecting rod r, and crank 8, whereby
the coupling between the feed roller and its driving mechanism is thrown in or out
of gear substantially as hereinbefore described and represented in figures 1, 1ª, 2
and 3 of the accompanying drawing.
2. The modification of the arrangement claimed in claim 1, consisting of
the lever bundle K, connecting rod Ŭ, lever W, shaft V, lever W¹, bolt N and
projection R, with fork S substantially as hereinbefore described and represented
in figures 4 and 6 of the accompanying drawing.
3. The arrangement for automatically releasing the pressure springs or weights
and stopping the feed consisting of the hinged lid w, projecting inwards when the
hopper is empty or nearly empty by means of the spring v, connecting rod w, stay
or support x, and rack y, with toothed wheel z, whereby the lever k, is disengaged
substantially as herein before described and represented in figures 1 and 2 of tho
accompanying drawing.
4. The arrangement for setting the feed slide a, by means of the hand lever b,
and rod c and for regulating the length of the link connecting the rod c, with the
slide a, by means of the screw f, and set screw g, substantially as herein before
described and represented in figures 1, 2, 4 and 5 of the accompanying drawing.