IMPROVEMENTS IN ROLLER MILLS FOR GRINDING CORN, AND FOR BIMILAR PURPOSES
Year: 1884

page_text: Bimmar Furposes.
I WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and C, Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for "IMPROVEMENTS IN ROLLER MILLS FOR GRINDING CORN, AND
FOR BIMILAR PURPOSES" to be as follows :-
This invention relates to roller mills and consists partly in arranging three
rollers, one above the other, and having their axos in different vertical planes.
This roller mill can also be constructed as a duplex roller mill with one set of three
rollers mounted on the right, and another set of three rollers on the left of a
common frame.
The grain is introduced into a hopper and passes over a feed-roller, which is
arranged in conjunction with an adjustable flap for controlling the amount of grain
fed to the grinding rollers. The grain then passes first between the upper and
middle grinding rollers and then between the middle and lower rollers, so that
each time it goes through the mill it is caused to paas twice between the rollers.
The ground product runs off at the lower part of the machine.
The middle roller is mounted in journal boxes rigidly secured to the side frames,
so that this roller cannot be adjusted whilst in use. The upper and lower rollers
are mounted in journal boxes each of which is made in one piece with a lever
pivotted on an axle. These axles are mounted in bearings which can be made
adjustable when desired, and that part of these axles which forms the pivot of tho
lever arms is made eccentric. When, therefore, one of the axles is turned round in
the one or other direction by means of a handle the eccentric will lift or depress
the levers carrying the bearings, and thus the corresponding roller will be caused
to approach, or recede from, the fixed middle roller.
In order to fix the adjustable rollers in any suitable positions, a slotted segment
and a set screw passing through the lever handle are provided. By screwing the
set screw into a slot in the segment, the lever handle, and therefore also the lever,
journal box, and the roller connected thereto will be fixed in the position into
which they have been adjusted.

page_text: For the purpose of enabling the rollers to move apart when too much grain is
fed to them or when a hard body passes between thein, the following arrangement
is used. Each of the journal-boxes is attached to the inner side of a standard by
a screw which is connected to a spring. When therefore the pressure between the
rollers becomes excessive the upper and lower rollers can recede against the
pressure of the said springs.
By the employment of the eccentric axles and their adjusting devices I am
enabled to place each of the adjustable rollers at any desired distance from the
middle fixed roller so that two products of different fineness can be ground at the
same time, that is to say, the rough product issuing from between the upper and
middle rollers can be reduced to a finer state between the middle and lower rollers.
All the bearings of the rollers are self-lubricating, a lubricating disc being
secured to the shaft in the middle of these bearings. This disc raises the oil from
below which is wiped off by a scraper and is distributed upon both sides of the
bearing. The oil then flows down through passages and is raised again by the
lubricating disc. The scraper is preferably made of sheet metal but it can be made
of any other suitable material. By this arrangement of the bearings a considerable
.economy in lubricating oil is obtained and the heating of the bearings is prevented.
A scraper is provided for each roller to scrape off the ground product therefrom.
Motion is communicated to the different parts of the mill by means of suitable
pulleys and gearing. The diameters of these gear-wheels differ so that the rollers
have different surface velocities, which has been found to be very advantageous for
grinding between rollers.
The rollers are preferably made of chilled cast iron, but they may be made of
porcelain or glass or any other hard material.
The rollers may have either equal or unequal diameters and are driven at unequal
velocities and the grooving of the upper and lower rollers may differ from that of
the middle roller, or the grooves of all three may be different.
It is evident that the sizes of the grooves, the diameters of the rollers and of the
differential toothed wheels may vary according to the product to be obtained.
Some of the rollers may be entirely smooth to deliver the finest products.
The above described construction of mills is particularly suitable for grinding
hard middlings; for flat grinding and for grinding different hard materials.
For the purpose of increasing the useful effect, the lower roller of each pair of
rollers working together is preferably more finely grooved than the upper roller so
that in the same interval of time the number of cutting edges of the second roller
brought into action is larger than that of the top roller, and that of the bottom or
third roller is larger than that of the second roller.

page_text: "
цаг гurposes.
I WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake and Co Patent Agents
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for IMPROVEMENTS IN ROLLER MILLS FOR GRINDING CORN AND
FOR SIMILAR PURPOSES 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 roller mills and consists essentially in arranging three
rollers one above the other, and having their axes in different vertical planes. The
improvements can also be applied to a duplex roller mill having one set of three
rollers mounted on one side and another set of three rollers on the other side of a
common frame all as hereinafter described.
In the accompanying drawings,
Figure 1 is a side elevation of a roller mill constructed according to this
invention.
Figure 2 is a vertical section of the same.
Figure 3 is a front elevation partly in section.
Figures 4, 5, 6, 7 and 8 are views hereinafter referred to.
Figures 9 and 10 are views showing the arrangement of a duplex machine.
Figure 11, is a view showing a modified form of driving gear.
a is a hopper into which the grain is introduced and from which it passes over
the feed roller which is arranged in conjunction with an adjustable flap c for
controlling the amount of grain fed to the grinding rollers d, e, f.
The grain first passes between the grinding rollers de and then between the
rollers ef so that each time it goes through the mill it is caused to pass twice
between the rollers. The ground product escapes through the spout g.
The roller e is mounted in journal boxes h h, Figures 1, 2 and 3, rigidly secured
to the sido frames of the machine so that this roller cannot be adjusted whilst
in use.
The rollers & and ƒ are mounted in journal boxes i each of which is integral
with a lever k pivotted on a shaft l.
l
These shafts are mounted in bearings m m which can be made adjustable
when desired, and the parts of these axles which form the pivots of the lever
arms kk are made excentric as shown in Figure 6. When therefore one of the
axles is turned in the one or other direction by means of its handle
excentric will lift or depress the connected lever k carrying the bearings i, and
the
P
thus the corresponding roller & or f will be caused to approach to, or recede from,
the fixed roller 6.
In order to fix the adjustable rollers in any suitable positions the arrangement
shown in Figures 1 and 3 is provided which consists of slotted segments n n and
screws o passing through the lever handles p. By screwing the set screw o into
the slots of the segments 22, the lever handles p, and therefore also the levers k the
journal boxes and the rollers connected thereto, will be fixed in the position into
which they have been adjusted.
For the purpose of enabling the rollers to move apart when too much grain is
fed to them, or when a hard body passes between them, the following arrangement

page_text: is used. Each of the journal boxes i is attached at the inner side of the standards
to a screw & which is connected to a spring t as shown in Figures 1 and 2. When
therefore the pressure between the rollers becomes excessive the rollers d and f can
recede from the roller e against the pressure of the springs t.
•
By the employment of the excentric axles and of their adjusting devices, I am
enabled to place each of the adjustable rollers & fat any desired distance from the
rollere, so that two products of different fineness can be ground at the same time
that is to say the rough product issuing from between the rollers de can be reduced
to a finer state between the rollers e and f.
All the bearings of the rollers are self-lubricating a lubricating disc v being
secured to the shaft in each bearing as shown in Figures 3 and 5. This disc raises
oil from below which is wiped off by a scraper u and is distributed upon both
sides of the bearing. The oil then flows down through the passages ww and is
raised again by the lubricating disc. The scraper u is preferably made of sheet
metal but it can be made of any other material. By this arrangement of the
bearings a considerable economy in lubricating oil is obtained and the heating of the
bearings is prevented.
A scraper, Figures 2 and 6, is provided for each roller to scrape off the ground
product therefrom.
8
The mill shown in Figures 1, 2, and 3 is driven by the pulley y the two small
pulleys and a¹ and the gear wheels 61 c¹ Figure 3. The diameters of these gear
wheels are different so that the rollers have different surface velocities, which has
been found to be very advantageous for grinding between rollers.
In some cases, in order to avoid the noise which is caused by the differential
gearing, I employ an arrangement of belts and pulleys.
This arrangement is clearly shown in Figure 11 of the drawings.
Motion is imparted to the driving pulley y upon the shaft of the fixed roller e;
upon the opposite end of this shaft is fixed a pulley 1 over which a belt passes;
this belt then passes down and under the pulley 2, thence up and over the pulley 3,
thence down and under the pulley 4, and thence back to the pulley 1.
The pulley 4 is mounted so that it can be adjusted vertically to alter the tension
of the belt.
The rollers are preferably made of chilled cast iron but they may be made of
porcelain or glass or of any other suitable bard material.
The said rollers may also be of either equal or unequal diameters as shown in
Figures 7 and 8 and be driven at unequal velocities and the grooving of the upper
and lower rollers may differ from that of the middle roller, or the grooves of all
three may be different.
For the purpose of increasing the useful effect the lower roller of each two rollers
working together is preferably more finely grooved than the upper roller so that in
the same interval of time the number of cutting edges of the second roller brought
into action is larger than that of the top roller, and that of the bottom or third
roller is larger than that of the second roller.
It is evident that the sizes of the grooves, the diameters of the rollers and of the
differential toothed wheels, or of the pulleys, may vary according to the product to
be obtained. Some of the rollers may be entirely smooth to deliver the finest
products.
The described construction of mills is particularly suitable for grinding hard
middlings and other hard substances.
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, I declare that what I claim is .
First. A roller grinding mill constructed and arranged substantially as described:
Second. The arrangement of the rollers with their axes in. different vertical
parallel planes substantially as shown and described.

page_text: Third. The means for adjusting the rollers and for securing the same in their
adjusted positions, substantially as shown and described.
Fourth. The employment of rollers of unequal diameters running at unequal
velocities and differently grooved, substantially as described.
Fifth. The construction of the roller bearings substantially as shown and
described.
Sixth. The arrangement of the springs t substantially as shown and described.
Seventh. The arrangement of belts and pulleys in lieu of gearing substantially
as described with reference to Figure 11, of the drawings for the purpose specified.
Dated this 31st day of August 1885,
HASELTINE, LAKE & Co.,
For the Applicant.