Improvements in Grinding Mills.
Year: 1895

page_text: Date of Application, 27th June, 1895-Accepted, 7th Dec., 1895
Improvements in Grinding Mills.
I, ADELE JAVELIER of 25 Rue du Drapeau, Dijon, France, Merchant, do
hereby declare the nature of my said invention and in what mauner the same
is to be performed to be particularly described and ascertained in and by the
following statement :--
The object of my invention is to effect the following improvements in or
connected with the construction and working of grinding mills :
1st: To improve the resulting condition of the material under treatment by
an increase of the working or grinding surfaces.
2nd To reduce the heavy parts in motion which produce a small amount of
work, and to reduce the friction of the material upon the working parts of the
machine.
3rd-To prevent the choking of the stones, by removing the scrapers which
usually collect the material in heaps and slide them under the said stones.
4th-To reduce the risks of accidents to the workmen in charge of said machines,
and to prevent the breakage of said machines.
5th To provide means for more effectually and methodically stirring the
material.
6th: To increase the grinding capacity of the stones by arranging their axes
in closer proximity, and
7th To dispense with the costly cutting and sharpening of the stones, and
thus avoid stoppages of the mill.
And in order that my said invention shall be the more readily understood and
carried into practical effect I have hereunto annexed a sheet of drawings and will
now proceed to describe the same with the assistance of the various figures and
letters of reference marked thereon.
Fig. 1 is a sectional elevation, and Fig. 2 a plan of a grinding mill with my
improvements applied thereto.
In accordance with my invention I arrange upon a grinding stone, laid flat and
either plain or lamellated, fixed or rotating, a series of grinding stones (A), the
form, nature, number, dimensions and speed of which varying according to the
requirements of the work for which they are used. These stones which are
preferably coupled together, run and turn, 1st, upon their own horizontal axes,
2ndly upon vertical axes, and 3rdly upon or around the main or common axis in
the grinding mill. Should the pan or bed revolve as in chocolate making and
grinding mills the third motion may be dispensed with.
The means for driving these stones will be determined by the arrangement of
the building wherein they are used and will be readily devised and constructed by
the engineer in charge.
The stones or runners when in the diagonal position will impinge by their outer
edges upon the inner and outer edges of the pan four times at each revolution on
their vertical axes without allowing the material to remain motionless in any part
of the pan and thus imparting to the material under treatment a very energetic
stirring or kneading.
The motive power required for a grinding machine is of three kinds: 1st:-That
which actuates the parts of the machine, 2udly :-That consumed by the work
proper, and 3rdly-That required to overcome the resistance offered by the
material to the rotation of the grinding parts.

page_text: The 1st being much more important than the 2nd, it is expedient to economise
it by reducing the weight and increasing the frictional power which assists in the
disintegration more than the weight. For example, in a grinding machine requiring
7 horse power, 6 horse power are for the gear and for setting the mass in motion,
and only one horse power for the grinding. By reducing the weight by 50%, only
from 3 to 4 horse power will be taken up for the motion, while 3 horse power,
instead of one, will be left for the actual work.
In some machines the 3rd important factor in the consumption of motive power
to no purpose, is that required for overcoming the resistance of the material to the
rotation of the cylinders, which power increases with the speed which is much
greater for many machines.
My machine having a slow motion is free from such a serious defect which is
well known in paper mills in particular.
The aforesaid multiple grinding rollers, which are carefully calculated according
to requirements, do not consume more power than former grinding machines
while yielding however a much more considerable amount of work.
I have shewn in the accompanying drawing (Figs. 1 and 2) four pairs of stones.
1 may use any suitable number thereof starting from one, and may have several
tracks with a central pair in order to obtain the highest possible "co-efficient of
work" for a given number of horse power according to the nature of the material
under treatment. The conversion of old grinding machines will be cheaply effected,
and moreover as the diameter of the stones is not large, old stones which have
been cast off as being too small may be used up.
My improved multiple grinding stone mill is capable of numerous applications
and may be used in paper mills to replace the former grinding mills, rag or pulp
engines, devils, disintegrators, etcetera ; horizontal grinding stones as well as all
other mills or works where material has to be disintegrated, torn, strained, ground,
crushed, triturated, mixed, pulverised, kneaded etc.
Having thus particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim and desire to secure by Letters Patent is :-
1st. In grinding mills the use of stones or edge runners working in one or more
pairs and having rotary (vertical and horizontal) and lateral movements in
combination with a stationary pan substantially as and for the purposes described
and illustrated on the accompanying drawing.
2nd. In grinding mills the use of stones or edge runners working in one or more
pairs and having rotary (vertical and horizontal) movements in combination with a
revolving pan substantially as and for the purposes described and illustrated on
the accompanying drawing.
Dated thi. 20th
M
1005
A. JAVELIER,
Applicant.