IMPROVE- MENTS IN APPARATUS FOR REGULATING THE FEED IN ROLLER MILLS FOR GRINDING GRAIN
Year: 1883

page_text: LETTERS PATENT to Thomas Inglis and Charles Herbert both of Edinburgh
in the County of Midlothian, North Britain, for an Invention of "IMPROVE-
MENTS IN APPARATUS FOR REGULATING THE FEED IN ROLLER MILLS FOR
GRINDING GRAIN
"
PROVISIONAL SPECIFICATION left by the said Thomas Inglis and Charles
Herbert at the Office of the Commissioners of Patents on the 12th June
1883.
THOMAS INGLIS and CHARLES HERBERT both of Edinburgh in the County of
Midlothian North Britain, 'IMPROVEMENTS IN APPARATUS FOR REGULATING THE
FEED IN ROLLER MILLS FOR GRINDING GRAIN
"
The object of this Invention is to obviate the difficulty found to exist when
using single Feed rolls where the material is fed in lumps or streaks and to secure
an automatic and regularly even feed through the whole length of the breaking
rolls of Roller Mills, employed in gradual reduction or other kindred systems in
use for grinding wheat, more especially in the latter " Breaks," or where rolls are
used for cleaning bran.-To attain this object, we apply two Feed rollers placed
horizontally at the bottom of the hopper.-The back feed roll, which is driven as
usual and suitably grooved, is geared with the front feed roll which is smooth,
so as to give the latter a slower or retarding motion towards the former by which
means the grain, which is usually fed in the centre of the hopper is distributed on
the faces of the feed rolls, before passing between them.
In order to regulate the quantity, the front feed roll is mounted on suitable
spring bearings, or similar arrangement, whereby the front or smooth retarding
roll is enabled to fall back from the face of the back or grooved Roll, when the
pressure of grain from above, becomes too great.-The distance between the centres
of these feed rolls is adjustable by means of set screws in the lever bearings
or other similar arrangements, but the front roll is always free to fall back.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Inglis and Charles Herbert in the Great Seal Patent Office
on the 11th December 1883.
THOMAS INGLIS and CHARLES HERBERT both of Edinburgh, in the County of
Midlothian, North Britain "IMPROVEMENTS IN APPARATUS FOR REGULATING THE
FEED IN ROLLER MILLS FOR GRINDING GRAIN
"
The object of our said Invention is to obviate the difficulty found to exist when
using a single feel roll where the material is fed in lumps or streaks and to secure
an automatic and regularly even feed through the whole length of the breaking
rolls of Roller Mills employed in gradual reduction or other kindred systems in
use for grinding wheat, more especially in the latter Breaks," or where rolls are
used for cleaning bran.-To attain this object we apply two feed rollers placed
horizontally at the bottom of the hopper.-The back feed roll which is driven as
usual and suitably grooved, is geared with the front feed roll which is smooth,
or which roll may also be grooved at the end when operating upon light material
so as to give the latter a slower or retarding motion towards the former by which
means the grain, which is usually fed in the centre of the hopper is distributed on
the faces of the feed rolls before passing between them.
In order to regulate the quantity the front feed roll is mounted on suitable
spring bearings or similar arrangements whereby the front roll is enabled to fall
back from the face of the back roll when the pressure of grain from above becomes
too great. The distance between the centres of these feed rolls is adjustable by
means of set screws in the lever bearings or other similar arrangements, but the
front roll is always free to fall back.
And in order that our said Invention may be properly understood we now proceed
more particularly to set forth the system, mode or manner in or under which
the same is or may be used or practically carried into effect, reference being had
to the accompanying Drawings and to the Letters and Figures marked thereon
that is to say :-
Figure 1, represents in end elevation part of a roller mill with our improvements
applied thereto.
Figure 2, being a side elevation of the same, taken at right angles to Figure 1.
Figures 3, and 4, are detached views, drawn to an enlarged scale, of the parts
constituting our improvements.
The feed roll A, which is mounted in the usual manner horizontally at the
bottom of the hopper H, is driven by the pulley a, through the toothed pinion a',
and toothed wheel a³, respectively, and the second or front feed roll B, is geared
with the back feed roll A, by the toothed wheels b, and a³, the relative diameter
of the said wheels being such that a slower or retarding motion is given to the
front feed roll B, towards the back roll A.
The back roll A, is grooved in the usual manner as shewn in Figure 4, and the
front roll B, which is shewn plain in the Drawing may also be similarly grooved.
- The roll B, as shewn more particularly in Figures 3, and 4, is mounted in
bearings supported by the spring arms or levers C, C, the said arms being secured
at c, to the lower part of the framing of the mill.-The arms C, thus constitute
springs and enable the roll B, to fall back from the face of the roll A, when the
pressure of grain from above becomes too great.-The distance between the centres
of the two feed rolls may be ad-adjusted by the set screws D, which work through
the upper parts of the levers C, the extremities d, of the screws bearing against
any suitable part a*, of the bearings or castings of the apparatus, the roll B, being
always free to fall back.-By thus employing two feed rolls mounted and working

page_text: in combination as hereinbefore described an automatic and regularly even feed of
grain is given through the whole length of the breaking rolls which may be the
rolls E, Figures 1, and 2, and thus the difficulty, hitherto experienced in effecting
this object where a single feed roll only is employed is obviated.
Having now described and particularly ascertained the nature of our said
Invention and the system mode or manner in or under which the same is or
may be practically carried into effect we would observe in conclusion that we
do not limit ourselves to the precise arrangements herein before described in the
mounting of the feed roller B, but what we consider to be novel and original and
therefore claim as the Invention secured to us by the herein before in part recited
Letters Patent is :-
First. In roller mills for grinding grain the front feed roll B, or its mechanical
equivalent operating differentially in relation to the back feed roll substantially as
hereinbefore described and shewn on the accompanying Drawings,
Second. In roller mills for grinding grain the mounting of the front Roll B, or
its mechanical equivalent in spring or elastic bearings substantially as and for the
purposes herein before described and shewn more particularly in Figures 3, and 4 of
the accompanying Drawings
In Witness Whereof I the said Charles Herbert have hereunto set my hand
and seal this twenty seventh day of November in the year of our Lord One
thousand eight hundred and eighty three.