Improvements in Roller Mills.
Year: 1890

page_text: Date of Application, 28th Mar., 1890
Complete Specification Left, 27th Dec., 1890-Accepted, 31st Jan., 1891
PROVISIONAL SPECIFICATION
Improvements in Roller Mills.
A communication from abroad by JOSEPH L. WILLFORD, of Minneapolis, in the
County of Hennepin and State of Minnesota, United States of America.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323, High Holborn, in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in roller grinding-mills. As certain
types of such mills are usually constructed, they are provided with one or more
pairs of rolls, and the material to be ground is passed between the rolls and thus
subjected to a grinding or crushing action. In such mills one roll of each pair is
generally mounted in fixed bearings, while the other roll is mounted in yielding
bearings for the purpose of allowing it to yield to permit any hard substance to pass
between the rolls without injury to their surfaces. The yielding roll is either
mounted in a pivoted ann or in a sliding box, and suitable springs are arranged to
force its bearings toward the other roll. Stops are also provided to limit the inward
movement of the bearings, these stops being usually made adjustable, and the tension-
springs are also usually provided with adjusting devices for the purpose of regulating
the tension of the springs. One of the rolls, usually the yielding one, is also
generally provided with means for moving it away from the stationary roll and
returning it when desired to its former position. The objections to these usual con-
structions are that where the upright swinging arms are used there must be a
loose fit of these arms on their pivots and another loose fit in the rods
that hold the upper ends of the arms, thus making two points at which
there is lost motion. When the feed is on and the material is passing
between the rolls, this lost motion will be taken up by moving the rolls outward;
but when the feed is off this lost motion permits the rolls to move inward, causing
the two rolls to run together. When there is a loose fit of the swinging arms upon
their pivots, the roll mounted in these arms, being the fast roll, will climb on the
other roll, when the feed is heavy, as far as permitted by this loose joint, and drop
when the feed is light, thus causing a clattering" motion and an unequal grinding.
Similar objections exist to the use of the sliding box, with which there is always
more or less lost motion, which is taken up by the forcing of the rolls apart when
the feed is on and by permitting the rolls to run together when the feed is off.
It is the object of this invention to overcome these objections, and to provide a
roller-mill, in which the rolls are held in the desired position, with no possibility
of any lost motion, while permitting one of the rolls to yield in case any undue
strain comes between them.
To this end, the invention consists in a roller-mill having the rolls
of each pair mounted in rocker-arms, each of said arms being normally held
against two bearings by suitable springs. The axis of one of the rolls is
arranged above (or, by a reversal of the parts, it might be below) both of the
bearings against which each of its rocker-arms is held, so that, when a hard
substance passes between the rolls, the rocker-arm supporting this roll will rock
upon the bearings nearest the said roll against the tension of the springs, moving
away from the other bearings, and thus permitting the roll to move away from the
other roll, and when said substance has passed, the arms are brought back by said
springs to their original position. The other roll is arranged between the bearings
of the rocker-arms, and the arms are held against said bearings by springs. One

page_text: of the bearings of this roll is preferably made adjustable, so as to permit of an
adjustment of the position of the roll, and this bearing is also movable for the
purpose of permitting the spreading of the rolls. The lower ends of the rocker-
arms at each end of the rolls are preferably arranged upon a common bearing, and
this bearing at one or both ends of the roll is made laterally adjustable. By
adjusting this bearing laterally, one of the rocker-arms is rocked upward and the
other downward, thereby causing the corresponding end of one roll to be raised and
of the other to be lowered, thus permitting the "tramming" of the rolls.
Other objects of this invention will appear from the following detailed
description:
A suitable casing, which is preferably formed of cast metal and supports the
operative parts of the machine, is provided.
"
Upon rocker-arms are formed the journal-bearings for the rolls. Certain of these
arms are arranged at the opposite ends of the mill and support the journal-bearings
of one roll, and the other arms hereinafter called the "second arms are arranged
at opposite ends of the mill and support the journal bearings of the other roll.
Both the arms are preferably secured to a strip of spring metal, which is preferably
attached to said arms at a point between their bearings. The spring forms a
flexible connection between the arms and prevents them from slipping on their
bearings.
The lower ends of the arms, together with the spring, are preferably sup-
ported upon
a suitable block, which is preferably supported upon a lug
formed upon or secured to the casing aforesaid. The block is preferably
provided with depending ears, and adjusting-screws extend through these ears and
engage the lug. A bolt passes through the spring-plate, through the block, through
a slot in the lug, and is provided at its lower end with a suitable nut. The hole in
the block through which the bolt passes is screw-threaded, and the bolt is screwed
into this block, so that the nut may be loosened without loosening the spring. By
this means, the plate, to which the arms are fastened, is rigidly secured to the block,
and said plate and block are secured to the lug. Arranged on the outside of each
first mentioned arm, is a projection formed on or secured to the casing. This
projection is preferably provided with a groove in its face, and a rib upon the arm
engages this groove. The projection forms one bearing and the block another.
A suitable spring is provided which tends to hold the rocker-arm at all times
against both of these bearings. Any preferred arrangement of spring may be
used for this purpose. It is preferred to provide a spring that engages the lower
end of both of the rocker-arms at points a short distance outside of the points
at which they bear upon the block. The bolt, by which the block is clamped in
place, is preferably provided with an upward extension, which passes through
the spring and is provided at the upper end with a suitable nut. A suitable
block is arranged upon the spring beneath the nut, and through the block the bolt
passes. The pressure of the spring is exerted upon the arm at a point between
its two bearings, so that said spring tends to hold said arm at all times in engage-
ment with both of said bearings, and if said arm is at any time rocked
pon one
of said bearings, and thereby moved away from the other bearing, it must done
by a force sufficient to overcome the pressure of said spring, and as soon as said
force ceases to act upon said arm, said spring will return the arm to its former
position. The roll bearing upon the arm is located at a point above the projection
and in this bearing the roll is journaled. This brings the centre of said roll
above both of the bearings of said rocker-arm, and as the other roll, which is
mounted as hereinafter described, is located directly opposite said roll, and when
in use is held rigidly, if any hard substance passes between the rolls, so that the
pressure tending to separate the rolls is greater than the force exerted by the
spring, the upper end of the arm will move outward the portion of said arm that
bears upon the projection, rocking upon said bearing, and the lower end of said
arm, rising slightly from its bearing upon the block, thus permits the roll to
move away from the other roll. As soon as the hard substance has passed the

page_text: rolls, the springs will rock the arm back upon its bearing thus returning the roll
to its original position.
The second rocker-arm bears at its lower end upon the block in a manner similar
to the arm aforesaid, and it is likewise engaged by the spring. A suitable shaft
is mounted in the frame of the machine at a point near the upper end of said
second arm, and a suitable eccentric is arranged upon said shaft. This eccentric
forms a second bearing for the rocker-arm. A block is arranged in a recess in
the arm and engages the eccentric. This block is preferably provided with a
groove, into which the edge of the eccentric extends. A rod, having a screw-
threaded end, engages the rocker-arm, passing into a threaded opening therein, so
that its end strikes the block. This rod may be extended to the front of the
machine. passing through a lug upon the arm, the perforation in the lug being
sufficiently large, so that the rod does not interfere with the desired movements
of the arm, and being provided with a hand-wheel. By turning this rod, the block
may be adjusted, and thereby either end of the roll adjusted independently toward
or from the other roll. The spring holds the rocker-arm at all times in engage-
ment with the eccentric. When the shaft is rotated so as to bring its short axis in
line with the block, the rocker-arm will be rocked back upon its lower bearing,
and the roll carried by it will be moved away from the other roll. The bearing
upon the arm for the roll is arranged opposite the roll bearing upon the arm and
between the bearing-points of the second arm, and as said arm is at all times
held by the springs against both of its bearings, the roll carried by said arm will
be incapable of yielding and will constitute the "fixed" roll. It is preferred to
arrange the block at one or both ends of the machine, so that by turning the set-
screw engaging the lug, said block and the rocker-arm supported by it may be
moved laterally, and by so doing one of said arms will be moved upward and the
other downward, thereby moving one end of one roll up and the other down. By
this means the rolls may be readily and accurately "trammed."
The invention has been described as applied to a four-roller mill, in which
instance the eccentric shaft is preferably located between the rocker-arms of the
two sets of rolls, the rocker-arms being the inner arms of each pair and the second
arms being the outer arms. By this means both sets of rolls may be simultaneously
spread or brought into grinding position.
For
In some instances, in place of using a spring-plate for forming a flexible con-
nection between the rocker-arms, other devices for this purpose are used.
instance, the rocker-arms may be connected by a wire rope, the ends of which pass
through openings in the arms, and are secured therein by means of wedges. The
upper surface of the block is provided with a groove and the under surface of the
arm is provided with a similar groove, and in these grooves the rope lies. The
bolt is provided in this instance with an eye through which the wire rope passes.
A block will in this instance preferably be arranged between the ends of the arms on
the bolt for the purpose of keeping the arms apart.
Instead of connecting the rocker-arms by an independent flexible plate or rope,
they may be formed of spring steel and be joined by a thin flexible portion formed
integrally with said arms.
Instead of arranging the spring above the arms, it may be arranged below them,
with links connecting the ends of the springs with the arms.
Instead of using a flat spring engaging directly with the rocker-arms, a coiled
or spiral spring may be used that is arranged upon the bolt with its lower end
arranged in a socket in a bearing-bar which is provided upon its under surface with.
ribs that engage the rocker-arms. The bearing may be made adjustable, as by
mounting it upon a screw-threaded bolt which engages a threaded opening in a lug
on the frame. It will be seen that with this construction a roller mill is provided
in which the tension-springs act to hold the rolls apart, so that they can never come
in contact with each other, and that the springs at the same time permit one roll to
yield when undue strain comes between them, and when such strain is relieved
brings them back at once to their former position. There is no chance for lost

page_text: motion, as each rocker-arm has two bearing-points on the frame of the machine"
and against both of these points the arm is held by its spring.
As the arms are flexibly connected, they form self-adjustable bearings for the
rolls, having the function of ball-and-socket bearings. When the rolls are put into
their bearings in the arms, said arms adjust themselves so as to bring their bearings
into perfect alignment with the rolls, and this alignment will be maintained when the
arms are moved for tramming the rolls.
The precise details above described need not be adhered to, as the construction
and arrangement may be slightly varied.
Dated this 27th day of March 1890.
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION
Improvements in Roller Mills.
A communication from abroad by JOSEPH L. WILLFORD, of Minneapolis,
Minnesota, United States of America.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool, and 6 Bank Street,
Manchester, both in the County of Lancaster, and 323 High Holborn, in the
County of Middlesex, Civil Engineer, 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:-
This invention relates to improvements in roller grinding mills. As certain
types of such mills are usually constructed, they are provided with one or more pairs
of rolls, and the material to be ground is passed between the rolls and thus
subjected to a grinding or crushing action. In such mills, one roll of each pair is
generally mounted in fixed bearings, while the other roll is mounted in yielding
bearings for the purpose of allowing it to yield to permit any hard substance to
pass between the rolls without injury to their surfaces. The yielding roll is either
mounted in a pivoted arm or in a sliding box, and suitable springs are arranged to
force its bearings toward the other roll. Stops are also provided to limit the
inward movement of the bearings, these stops being usually made adjustable, and
the tension springs are also usually provided with adjusting devices for the purpose
of regulating the tension of the springs. One of the rolls, usually the yielding one,
is also generally provided with means for moving it away from the stationary roll
and returning it, when desired, to its former position. The objections to these
usual constructions are that, where the upright swinging arms are used, there must
be a loose fit of these arms on their pivots and another loose fit in the rods that
hold the upper ends of the arms, thus making two points at which there is lost
motion. When the feed is on and the material is passing between the rolls, this
lost motion will be taken up by moving the rolls outward; but, when the feed is off,
this lost motion permits the rolls to move inward, causing the two rolls to run
together. When there is a loose fit of the swinging arms upon their pivots, the
roll mounted in these arms, being the fast roll, will climb on the other roll, when
the feed is heavy, as far as permitted by this loose joint, and drop when the feed is
light, thus causing a clattering motion and an unequal grinding. Similar
objections exist to the use of the sliding box, with which there is always more or
less lost motion, which is taken up by the forcing of the rolls apart when the feed
is on and by permitting the rolls to run together when the feed is off.
<<
27
It is the object of this invention to overcome these objections, and to provide a
roller mill, in which the rolls are held in the desired position with no possibility of
any lost motion, while permitting one of the rolls to yield in case any undue strain
comes between them.

page_text: To this end, the invention consists in a roller mill having the rolls of each pair
mounted in rocker arms, each of said arms being normally held against two
bearings by suitable springs. The axis of one of the rolls is arranged above (or,
by a reversal of the parts, it might be below) both of the bearings against which
each of its rocker arms is held, so that, when a hard substance passes between the
rolls, the rocker arm supporting this roll will rock upon the bearings nearest the
said roll against the tension of the springs, moving away from the other bearings,
and thus permitting the roll to move away from the other roll, and when said
substance has passed, the arms are brought back by said springs to their original
position. The other roll is arranged between the bearings of the rocker arms, and
the arms are held against said bearings by springs. One of the bearings of this
roll is preferably made adjustable, so as to permit of an adjustment of the position
of the roll, and this bearing is also movable for the purpose of permitting the
spreading of the rolls. The lower ends of the rocker arms at each end of the rolls
are preferably arranged upon a common bearing, and this bearing at one or both
ends of the roll is made laterally adjustable. By adjusting this bearing laterally,
one of the rocker-arms is rocked upward and the other downward, thereby causing
the corresponding end of one roll to be raised and of the other to be lowered, thus
permitting the tramming" of the rolls.
Other objects of this invention will appear from the following detailed descrip-
tion, taken in connection with the accompanying drawings, in which:-
Figure is an elevation of a four-roller mill, havin; this invention applied
thereto.
Figure 2 is an elevation looking in a direction at right angles to the plane of
Figure 1.
Figure 3 is an elevation, partly in section, of the means for supporting the ends
of two of the rolls.
Figures 4, 5 and 6 are details.
Figures 7, 8, 9, 10 and 11 are details of modifications.
Figure 12 is a detail showing means for adjusting one of the bearings.
In the drawings :-
2 represents a suitable casing, which is preferably formed of cast metal and
supports the operative parts of the machine.
3 and 5 are rocker arms, upon which are formed the journal bearings for the
rolls. The arms 3 are arranged at the opposite ends of the mill and support the
journal bearings of one roll, and the arms 5 are arranged at opposite ends of
the mill and support the journal bearings of the other roll. The arms 3 and 5 are
preferably secured to a strip of spring metal 9, which is preferably attached to said
arms at a point between their bearings. The spring 9 forms a flexible connection
between the arms and prevents them from slipping on their bearings.
The lower ends of the arms 3 and 5, together with the spring 9, are preferably
supported upon a suitable block 11, and the block 11 is preferably supported upon
a lug 13, formed upon or secured to the casing 2. The block 11 is preferably
provided with depending ears 15, and adjusting screws 17 extend through these
cars and engage the lug 13. A bolt 19 passes through the spring plate 9, through
the block 11, through a slot in the lug 13, and is provided, at its lower end, with a
suitable nut 20. The hole in the block 11, through which the bolt 19 passes, is
screw-threaded, and the bolt is screwed into this block, so that the nut 20 may be
loosened without loosening the spring 9. By this means, the plate 9, to which the
arms are fastened, is rigidly secured to the block 11, and said plate and block are
secured to the lug 13. Arranged on the outside of each arm 3 is a projection 25,
formed on or secured to the casing 2. This projection is preferably provided with
a groove in its face, and a rib 27 upon the arm 3 engages this groove. The
projection 25 forms one bearing and the block 11 another.
A suitable spring is provided, which tends to hold the rocker arm at all times
against both of these bearings. Any preferred arrangement of spring may be used
for this purpose. It is preferred to provide a spring 28, that engages the lower

page_text: end of both of the rocker arms at points a short distance outside of the points at
which they bear upon the block 11. The bolt 19, by which the block 11 is
clamped in place, is, preferably, provided with an upward extension 29, which
passes through the spring 28, and is provided, at the upper end, with a suitable
nut 30. A suitable block 31 is arranged upon the spring 28 beneath the nut 30,
and through the block the bolt 29 passes. The pressure of the spring 28 is exerted
upon the arm 3 at a point between its two bearings, so that said spring tends to
hold said arm at all times in engagement with both of said bearings, and, if said
arm is at any time rocked upon one of said bearings, and thereby moved away from
the other bearing, it must be done by a force sufficient to overcome the pressure
of said spring, and, as soon as said force ceases to act upon said arm, said spring
will return the arm to its former position. The roll bearing upon the arm 3 is
located at a point above the projection 25, and, in this bearing, the roll 4 is
journaled. This brings the centre of said roll above both of the bearings of said
rocker arin, and, as the other roll 6, which is mounted as hereinafter described, is
located directly opposite said roll 4, and, when in use, is held rigidly, if any hard
substance passes between the rolls, so that the pressure tending to separate the
rolls is greater than the force exerted by the spring 28, the upper end of the arm 3
will move outward the portion of said arm that bears upon the projection 25,
rocking upon said bearing, and the lower end of said arm rising slightly from its
bearing upon the block 11, thus permits the roll 4 to move away from the roll 6.
As soon as the hard substance has passed the rolls, the springs 28 will rock the
arm 3 back upon its bearing 25, thus returning the roll to its original position.
The rocker arm 5 bears at its lower end upon the block 11 in a manner similar
to the arm 3, and it is likewise engaged by the spring 28. A. suitable shaft 33 is
mounted in the frame of the machine at a point near the upper end of said arm 5,
and a suitable eccentric 35 is arranged upon said shaft. This eccentric forms a
second bearing for the rocker arm 5. A block 37 is arranged in a recess in the
arm 5 and engages the eccentric 35. This block is preferably provided with a
groove, into which the edge of the eccentric extends. A rod 39, having a screw-
threaded end, engages the rocker arm 5, passing into a threaded opening therein, so
that its end strikes the block 37.. This rod may be extended to the front of the
machine, passing through a lug 43 upon the arm 3, the perforation in the lug being
sufficiently large, so that the rod does not interfere with the desired, movements of
the arm, and being provided with a hand wheel 41. By turning this rod 39, the
block 37 may be adjusted, and thereby either end of the roll adjusted independently
toward or from the other roll. The spring holds the rocker arm at all times in
engagement with the eccentric 35. When the shaft 33 is rotated so as to bring its
short axis in line with the block 37, the rocker arm 5 will be rocked back upon its
lower bearing, and the roll carried by it will be moved away from the other roll.
The bearing upon the arm 5 for the roll 6 is arranged opposite the roll bearing
upon the arm 3, and between the bearing points of the arm 5, and, as said arm is
at all times held by the springs against both of its bearings, the roll carried by
said arm will be incapable of yielding and will constitute the " "fixed roll. It is
preferred to arrange the block 11 at one or both ends of the machine, so that, by
turning the set screw engaging the lug 13, said block 11 and the rocker arm
supported by it may be moved laterally, and, by so doing, one of said arms will be
moved upward and the other downward, thereby moving one end of one roll up
and the other down. By this means, the rolls may be readily and accurately
"trammed."
"
In the accompanying drawings, the invention is shown as applied to a four roller
mill, in which instance the eccentric shaft is preferably located between the rocker
arms 5 of the two sets of rolls, the rocker arms 5 being the inner arms of each pair
and the arms 3 being the outer arms, as shown in Figure 2. By this means, both
sets of rolls may be simultaneously spread or brought into grinding position.
In some instances, in place of using a spring plate 9 for forming a flexible con-
nection between the rocker arms, other devices for this purpose are used. For

page_text: instance, in Figure 7, the rocker arms may be connected by a wire rope 51, the
ends of which pass through openings in the arms and are secured therein by means
of wedges 53. The upper surface of the block 11 is provided with a groove 55,
and the under surface of the arm is provided with a similar groove, and, in these
grooves, the rope lies. The bolt 19 is provided, in this instance, with an eye 52,
through which the wire rope passes, as shown in Figures 7 and 10. A block 54
will, in this instance, preferably be arranged between the ends of the arms on the
bolt 19, for the purpose of keeping the arms apart.
Instead of connecting the rocker arms by an independent flexible plate or rope,
they may be formed of spring steel and be joined by a thin flexible portion 57,
formed integrally with said arms, as shown in Figure 8.
Instead of arranging the spring 28 above the arms, it may be arranged below
them, as shown in Figure 9, with links 59 connecting the ends of the springs with
the arms, as shown in that figure.
Instead of using a flat spring engaging directly with the rocker arms, a coiled
or spiral spring 61 may be used, that is arranged upon the bolt 19, with its lower
end arranged in a socket in a bearing bar 63, which is provided upon its under
surface with ribs 65, that engage the rocker arms, as shown in Figure 11. The
bearing 25 may be made adjustable, as by mounting it upon a screw threaded
bolt 56, which engages a threaded opening in a lug on the frame, as shown in
Figure 12. It will be seen that, with this construction, a roller mill is provided,
in which the tension springs act to hold the rolls apart, so that they can never
come in contact with each other, and that the springs at the same time permit
one roll to yield when undue strain comes between them, and, when such strain is
relieved, brings them back at once to their former position. There is no chance
for lost motion, as each rocker arm has two bearing points on the frame of the
machine, and against both of these points the arm is held by its spring.
As the arms are flexibly connected, they form self-adjustable bearings for the
rolls, having the function of ball and socket bearings.
When the rolls are put
into their bearings in the arms, said arms adjust themselves so as to bring their
bearings into perfect alignment with the rolls, and this alignment will be main-
tained when the arms are moved for tramming the rolls.
This invention is not confined to the details of construction or arrangement
shown in the accompanying drawings.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, 1 declare that what I claim is :-
1. In a roller mill, a roll supporting rocker arm, bearings upon which said
arm rests, and a spring holding said arm in engagement with said bearings.
2. In a roller mill, a rocker arm, a roll supported upon said rocker arm, bearings
upon which said rocker arm rests arranged below the axis of said roll and a
spring holding said arm in engagement with said bearings.
3. The combination, in a roller mill, with the bearings 11 and 25, of the rocker
arm 3, resting upon said bearings and provided with a journal bearing located above
said bearings 11 and 25, and a suitable spring tending to hold said arm in engage-
ment with said bearings.
4. The combination, in a roller mill, with a roll supporting rocker arm, of a
laterally adjustable bearing, upon which the lower end of said arm rests, the
bearing 25, and a spring tending to hold said arm in engagement with both of said
bearings.
5. In a roller mill, the combination, with a roll supporting rocker arm, of bearings
for said arm upon the frame of the mill, and a flexible connection between said arm
and one of said bearings, for the purpose set forth.
6. The combination, in a roller mill, of a roll supporting rocker arm, a bearing
supporting the lower end of said arm, an adjustable bearing supporting the upper
end of said arm, and a spring holding said arm against both of said bearings.

page_text: 7. The combination, in a roller mill, of the roll supporting rocker arm 5, the
block 11, forming a bearing for the lower end of said arm, the shaft 33 provided
with an eccentric 35 forming a bearing for the upper end of said arm, and a spring
engaging said arm at a point between said bearings, and holding the arm against
both of said bearings.
8. The combination, in a roller mill, of the roll supporting arm 5, the laterally
adjustable block 11, supporting the lower end of said arm, a flexible connection
between said block and said arm, and the eccentric engaging the upper end
of said arm.
9. The combination, in a roller mill, of roll supporting rocker arms 3 and 5, a
laterally adjustable bearing supporting the lower ends of said arms, and bearings
supporting the upper portions of said arms.
10. The combination, in a roller mill, of the roll supporting rocker arms 3 and 5,
the laterally adjustable block 11, a flexible connection between said arms, the
bearing 25, against which the arm 3 rests, the eccentric forming a bearing for the
upper portion of the arm 5, and a suitable spring holding said arms in engagement
with their bearings, substantially as described.
11. The combination, in a roller mill, of roll supporting rocker arms, two
bearings supporting each of said arms, and a spring holding each arm in engage-
ment with both of its bearings.
12. The combination, in a roller mill, of roll supporting rocker arms, a laterally
adjustable bearing supporting the lower ends of both of said arms, bearings
supporting the upper portions of said arms, and a spring holding each of said
arms against its bearings.
13. The combination, in a roller mill, with the rolls, of rocker arms supporting
said rolls, and springs engaging said rocker arms and holding the rolls apart,
substantially as described.
14. The combination, in a roller mill, with the rolls, of rocker arms supporting
said rolls, bearings upon which said arms rest, and springs holding said rolls apart
and said arms in engagement with their bearings.
15. The combination, in a roller mill, of roll supporting rocker arms, a bearing
supporting the lower ends of both of said arms, a bearing engaged by one of said
arms at a point below its roll, a movable bearing engaged by the other arm at a
point above its roll, and springs holding said arms in engagement with their
bearings.
16. The combination, with the rocker arms 5, provided with the bearing block 37,
of the shaft 33, provided with the eccentric 35, engaging said block, the adjusting
screw 39, engaging said block, and a spring holding said arm with the block 37
against said eccentric, substantially as described.
17. The combination, in a roller mill, of roll supporting rocker arms, bearings
upon which said arms rest, a flexible connection between said arms, and a spring
holding said rolls apart and said arms in engagement with their bearings.
18. The combination, in a roller mill, of rocker arms supporting the rolls,
bearings outside of said arms upon which said arms rest, and springs holding both
of said arms in contact with their bearings, substantially as described.
Dated this 24th day of December 1890.
WM. P. THOMPSON & Co.,
Agents for the Applicant.