Improvements in or connected with Apparatus for Feeding Granular Substances to Roller Mills.
Year: 1899

page_text: Date of Application, 7th July, 1899
Complete Specification Left, 30th Mar., 1900—Accepted, 12th May, 1900
Improvements in or connected with Apparatus for Feeding
Granular Substances to Roller Mills.
I, CHARLES JOHN ROBINSON, of Railway Works, Rochdale, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to vibrating feed trays for roller mills. Heretofore it has
been the practice to impart motion to the feed tray in one direction by means of
springs the ends of the springs bearing against the tray and against the casing or
cover of the mill, thus the motion of the tray was. communicated to and caused
considerable vibration of such casing necessitating very strong construction and
attachments to prevent rapid loosening or destruction of the casing.
Now the object of my invention is to provide for ready adjustment of the springs
and to prevent as much as possible the motion of the tray or of its connections being
communicated to the casing and for these purposes I make use of a shaft or bar
attached to the feed tray and passing freely through the casing at each side. The
springs are provided bearing against or connected to the ends of the shaft or bar
outside the casing the other ends of the springs bearing against or being connected
to brackets secured to the frame of the mill preferably to that part of the frame
which carries the shaft for giving motion to the tray. The springs are provided with.
suitable adjusting screws and nuts. Motion may be given to the tray by any suitable
means such as by excentrics bearing against antifriction pulleys carried on the shaft
or bar above mentioned.
By the above arrangement the casing of the mill is practically free from vibration
caused by the tray as such tray is not connected with the casing except by the
suspending links, and therefore there is no liability to loosening or shaking of such
casing the attachments of which may be in consequence much lighter than heretofore.
Also the springs being outside the casing can be most readily adjusted as to tension
there being no need to open the casing. I prefer to attach the casing by brackets to
the brackets which carry the shaft for driving the tray;
Thated this Q-th day of T..]., 1000
Improvements in or connected with Apparatus for Feeding
Granular Substances to Roller Mills.
I, CHARLES JOHN ROBINSON, of Railway Works, Rochdale, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention and in what
Price 8d1

page_text: manner the same is to be performed, to be particularly described and ascertained in
and by the following statement, reference being had to the accompanying drawings:-
This invention relates to vibrating feed trays for roller mills. Heretofore it has
been the practice to impart motion to the feed tray in one direction by means of
springs the ends of the springs bearing against the tray and against the casing or
cover of the mill, thus the motion of the tray was communicated to and caused
considerable vibration of such casing necessitating very strong construction and
attachments to prevent rapid loosening or destruction of the casing.
Now the object of my invention is to provide for ready adjustment of the springs
and to prevent as much as possible the motion of the tray or of its connections being
communicated to the casing and for these purposes I make use of a shaft or bar
attached to the feed tray and passing freely through the casing at each side. Springs
are provided bearing against or connected to the ends of the shaft or bar outside the
casing the other ends of the springs bearing against or being connected to brackets
secured to the frame of the mill preferably to that part of the frame which carries the
shaft for giving motion to the tray. The springs are provided with suitable adjusting
screws and nuts. Motion may be given to the tray by any suitable means such as by
excentrics bearing against antifriction pulleys carried on the shaft. or bar above
mentioned:
.
By the above arrangement the casing of the mill is practically free from vibration
caused by the tray as such tray is not connected with the casing except by the
suspending links, and therefore there is no liability to loosening or shaking of such
casing the attachments of which may be in consequence much lighter than
heretofore. Also the springs, being outside the casing, can be most readily adjusted
as to tension there being no need to open the casing. I prefer to attach the casing
by brackets to the brackets which carry the shaft for driving the tray.
In the drawings I show a method of carrying my invention into practice. Fig. 1
is a side elevation and Fig. 2 is a plan of so much of a roller mill as is necessary to
illustrate my invention. a is the main frame of the mill. b are the rollers carried
in bearings c as usual d is the casing surrounding the rollers. The rollers are driven
in any usual or convenient manner by belts or gearing. e is the feed tray suspended
from the casing in the usual manner by flexible straps and delivering the granular
substance to the two sets of rollers b. f is the hopper for feeding the substance to
the feed tray. g is a bar or shaft secured to the tray e by bolts and passing through
openings h in the casing but not in contact therewith. are antifriction pulleys on
the ends of the bar g against which excentricsj on a rotatable shaft k bear. The shaft k
may be driven by a belt from a pulley m on the shaft of one of the rollers b.
nare springs bearing against the ends of the bar y at o, so as to press the pulleys i
against the excentrics j, and give motion to the tray in one direction, the excentrics,
by the rotation of the shaft k, giving motion to the tray in the other direction. . The
other ends of the springs bear against adjustable nuts p on screws which are carried
in brackets secured to parts s of the frame of the mill which carry the shaft k. By
means of these nuts and screws the pressure of the springs against the bar 9 can be.
easily regulated even when the mill is running, as the springs are quite independent
of the casing and freely accessible by the springs not being connected with the
casing, the vibration of the tray cannot be communicated by such springs to the
casing which therefore may be of lighter construction and needs less rigid attach-
ments to the frame. t are brackets for attaching the casing to the frame. Although
I have shown and described the springs as in compression it will be obvious that
springs in extension might be employed, also that the springs might be connected in
various ways between the bar g and the framing of the mill without departing from
the essential feature of my invention.
Having now particularly described and ascertained the nature of my said iuven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
In roller mills the combination with a bar or shaft attached to the feed tray and

page_text: projecting outside the casing, of springs connected to the ends of such bar and to
parts of the frame of the mill exterior to and independent of the casing substantially
as and for the the purposes set forth.
Dated this Twenty-ninth day of March 1000
W. B. JOHNSON,
4, Clayton Square, Liverpool, Agent.