Improvements in Feeding-apparatuses for Roller-mills.
Year: 1889

page_text: Date of Application, 28th Jan., 1889
Complete Specification Left, 17th Aug., 1889-Accepted, 21st Sept., 1889
PROVISIONAL SPECIFICATION.
Improvements in Feeding-apparatuses for Roller-mills.
I, GUSTAV DAVERIO, of Leonhartstrasse No. 192, Zurich, Switzerland, Engineer
do hereby declare the nature of this invention to be as follows:-
My invention relates to feeding-apparatuses of roller-mills which consist in a
hopper, a feed-roller, and a feed-regulating plate arranged within the hopper, and the
lower edge whereof forms with the periphery of the feed-roller a slit through which
the grist passes from the hopper to the grinding rolls.
For different kinds of grist it is desirable that the said feed-regulating plate be
capable of being brought into different angular positions relatively to the portion of
the roller-surface opposite to the lower edge of the plate. For this purpose the plate
is hung at the top on pivots that are parallel to the roller, it is provided with an
adjusting-screw for swinging it on the said pivots, and it is fitted at the lower end
with a slide arranged to he shifted thereon up and down according as the plate is to
be placed more in radial or in tangential position relatively to the roller, and as the
width of the slit between the plate and the roller is to be altered.
Besides this, the adjusting-screw may be connected to the feed-regulating plate by
a spring, which allows the plate to yield when the quantity of grist contained in the
hopper is considerable.
Dated the 28th day of January 1889
J. H. JOHNSON & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Feeding Apparatuses for Roller-mills.
1, GUSTAV DAVERIO, of No. 192, Leonhartstrasse, Zurich, Switzerland, 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
My invention relates to feeding-apparatuses of roller-mills, which apparatuses consist
in a hopper, a feed-roller, and a feed-regulating plate, arranged within the hopper,
and the lower edge whereof forms with the periphery of the feed-roller a slit,
through which the grist passes from the hopper to the grinding rolls.
For different kinds of grist it is desirable that the said feed-regulating plate be
capable of being brought into different angular positions relatively to the portion of
the roller-surface opposite to the lower edge of the plate. For this purpose the plate
is hung at the top on pivots that are parallel to the roller, it is provided with an
adjusting-screw for swinging it on the said pivots, and it is fitted at the lower end
with a slide arranged to be shifted thereon up and down, according as the plate is
to be placed more in radial or in tangential position relatively to the roller, and as
the width of the slit between the plate and the roller is to be altered.
Besides this, the adjusting-screw may be connected to the feed-regulating plate by
a spring, which allows the plate to yield when the quantity of grist contained in the
hopper is considerable.
Fig. 1 of the annexed drawings shows in transverse section a feeding-apparatus
comprising my improvements with exception of the aforesaid spring. Fig. 2 is a like
section of the apparatus provided with spring. Fig. 3 is partly a front view, partly
a longitudinal section corresponding to both preceding figures.
a is the hopper, b the feed-roller, and c the regulating-plate. This plate is
Euspended at the top on the pivots e e, and it is connected by the link to the rod i

page_text: passing through and coupled to the hollow screw g, which works in a nut forming a
part of the hopper a, so that by the rotation of the screw the position of the plate c
may be changed. h is a lock-nut for securing the screw g. in the position imparted
thereto. For regulating the length of the plate (i.e. its vertical dimension) so that
the required narrow slit is left between its lower edge and the roller b, the part d
of the plate is arranged to form a slide which may be shifted up and down and
secured by means of screws and thumb-nuts.
If substances are to be ground which do not pass easily through the feed-slit, as
is the case with such as contain much flour or bran, it is necessary that the plate c
have a tangential position, relatively to the roller b, as is shown in the drawing by
full lines. With the plate placed radially the feeding would be impossible under the
said conditions. If, on the other hand, grists are to be treated which run well, for
instance semolina, the plate must have a position more or less radial to the roller, as
shown in fig. 1 by dotted lines, because otherwise it would be difficult with these
kinds of grist to regulate the feed, and impossible to intercept it entirely even if the
roller were stopped. With the described arrangement the regulating-plate may be
put into any position required in practice.
In order to impart to the regulating-plate the faculty to yield to the pressure of
the grist, if there is a considerable accumulation of the same in the hopper, a spring k,
fig. 2, is enclosed between the bottom of the hollow of the screw g and a collar on
the rod, the said rod and collar being arranged to slide in the screw.
In conse-
quence of this disposition the feed-slit becomes wider if the quantity of grist
arriving augments, while it becomes narrower if the latter diminishes, the result
thereby obtained being that in all cases the grist is distributed uniformly over the
whole length of the grinding-rollers. According as the grist has a higher or lower
specific gravity, the tension of the spring is increased or reduced by means of the
nuts n.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a roller-mill, the combination, with the feed-roller and the hopper a, of a
feed-regulating plate c, suspended on pivots e and having an adjustable sliding portion d,
and mechanism for adjusting the said plate to different angular positions, substantially
as described.
2. The combination, with the feed-regulating plate c and the adjusting mechanisin,
set forth in claim No. 1, of a spring i, through which the said mechanism acts on the
plate c, substantially as specified.
Dated the 15th day of August 1889.
J. H. JOHNSON & Co.