Year: 1884

page_text: We, RUDOLF SETZ of Clus near Balsthal (Switzerland, Mechanician, and JEAN
SCHWEITER also of Clus Balsthal (Switzerland) Mechanician seek leave to amend
the specification of Letters Patent, N° 10,362 of 1884, as shown in red ink in
the copy of the original specification hereunto annexed :—
Our reasons for making this amendment are as follows: Since filing our
specification we have been advised that the working of the jaw C could with
advantage be more fully described as the wording of the clause referring thereto
does not seem to indicate this feature with sufficient clearness; we have also been
led to think that the second claim might be held to include constructions which at
the time of our application for Letters Patent were known and in public use. We
therefore wish to amend the description and to restrict our claims.
In the matter of the application made by Rudolf Setz and Jean Schweiter for
leave to amend the Specification of Letters Patent N° 10,362 of 1884.
I hereby grant leave to the said Rudolf Setz and Jean Schweiter to amend the
said Specification in the manner proposed.
H. READER LACK,
Comptroller General.

page_text: We RUDOLF SETZ of Clus near Balsthal (Switzerland) Mechanician and JEAN
SCHWEITER also of Clus near Balsthal (Switzerland) Mechanician do hereby declare
the nature of this Invention for "IMPROVEMENTS IN APPARATUS FOR GRINDING AND
DESINTEGRATING GRAINS, MINERALS, ORES, AND SUCH LIKE and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
,,
In all the apparatus for grinding or reducing with discs rotating in a vertical
plane as hitherto constructed, the body or piece supporting the grinding disc proper
is,, like this latter arranged as an entire disc supported opposite the grinding disc
proper concentrically or excentrically and having the same or a smaller diameter.
In these constructions either the counter disc is fixed and the grinding disc alone
rotates or both are moved so as to simultaneously produce the breaking squeezing
and pulverizing effect.
All these known constructions as well as roller mills suffer from the defect that
the grinding process that is to say the manner of the reduction is not under
perfect control and that the waste. of power is correspondingly unnecessarily
increased.
In the present construction this is avoided as the grain arrives tangentially
between the rotating disc and a fixed jaw which but partly covers the disc so that
the path for the grain is precisely prescribed by suitable shape, dimensions, and
dress or grooving of the jaw the grinding process may therefore be controlled
both as to duration and kind in a very simple manner which is of special
importance with grain which requires to be carefully treated.
"
"1
In the accompanying Drawings the apparatus is illustrated and
Figure 1 is a vertical section thereof on the lines a, b, c. d. of Figure 3.
Figure 2 vertical section on line e f g h of Figüre 3.
Figure 3 plan of the apparatus partly in section.
t
Figure 4 and 6 representation of the fixed jaw and feeding device on an enlarged
scale.
"
;
As may be seen from these Figures only the vertical disc A on the shaft W
receives a rotary motion whose velocity is varied according to the material to be
worked up. From the same circumstance depends the choice of the material and
the "dress or grooving and the porosity of the grinding surfaces B fixed upon
the disc A. The grinding jaw properly so called, C, has bearings in the casing D
of the apparatus slightly to one side of the centre thereof and as near as possible
to the exterior periphery of the grinding disc as to its height it is so placed that
only the lower part which is wholly or partly grooved or "dressed" and which is
approximately radial bears towards the grinding surfaces B of the grinding disc A
leaving a suitable clearance whilst the upper part which is not grooved adjoins the
hopper so that the space between the grinding surface and grinding jaw widens
somewhat like a
like a funnel towards the top whereby the material to be ground is well
scized and drawn between the disc and jaw.

page_text: upra sp
4 14
a-fixed-position-facing the grinding-surface.
Whilst the working is regular the grinding jaw C is, by the coiled spring Hand
the head of screw. I bearing with the double-nuts against the boss of the handwheel k,.
maintained in a fixed position with relation to the grinding surfaces, but in such
a manner that the jaw is not pressed against the grinding surfaces and in the
space so formed (capable of being varied according to the material to be ground) a
true grinding operation is effected, this being particularly important when the mill
is used for hulling.
Should however coarser pieces get between the working surfaces the jaw can
recede as the spring yields. For exact adjustment of the jaw in accordance
with the material to be ground as well as for tightening the spring provision is
made partly by hand wheel K engaging with the casing and partly by screw L and
double nuts.
The grist or material to be ground is introduced by the funnel shaped hopper
above either by a directly filled feed roller or in any other suitable manner the
material to be reduced enters to the effective parts in a direction which is perfectly
tangential to the motion of the grinding roller by reason of the above described
shape of the grinding jaw it is drawn between the latter and the grinding surfaces
and drops out through the casing D reduced or ground. The path taken by the
grist with this tangential feed is perfectly known and by suitable size shape and
grooving or "dress" of the grinding jaw C any desired effect can be obtained and
the material be acted upon a more or less strongly and for a shorter or longer
period.
For removing such particles of comminuted matter as settle in the grooves or
pores of the grinding surfaces a brush R is employed, which being guided by pins
in suitable eyes of the case D can by a thumb screw be suitably pressed against
the grinding surface to be brushed. As will be apparent from the Drawings the
above described arrangement by simply doubling the mechanism above set forth
admits of grinding surfaces being provided in the simplest manner at both sides
of the grinding disc and a different product may be obtained at each side.
A further advantage resulting herefrom is that axial pressure on the two sides is
equalized so that ultimately a minimum of frictional resistance is attained.
We do not, however, broadly claim such arrangement, as the utilisation of two
grinding surfaces on the two sides of a disc and in a similar manner has been
heretofore known.
The above described apparatus is suited for grinding or reducing any kind of
material which already is in the shape of moderately small granules and the
material from which the grinding surfaces are made their "dress" and porosity,
the velocity of the grinding disc as well as size shape and "dress" of the jaw being
ruled by the material to be ground.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is,
1) The combination with the grinding disc A running in fixed bearings and
always in the same plane of the fixed jaw C the lower part of which is wholly or
partly grooved or "dressed" and the upper part joining the hopper (the whole
covering a part only of the grinding face) substantially as set forth.
•
2) The-arrangement-of-grinding
combination-with-the-eorrespondingly doubled-mechanisms.
surfaces-at-both-sides-of-the-grinding-dise-A-in
2 3) In combination with the arrangements shown in the first and-second claim.
a) The arrangement of the supply devices for the material to be reduced as well
as the partial grinding jaw C as near as possible to the outer periphery of the
rotating grinding surfaces for the purpose of introducing the material in a direction
tangential to that of the direction of motion of the rotating part.

page_text: b) The arrangement of the spring H the handwheel and set screw K and screw
bolt L with double nuts to allow the grinding jaw to be exactly adjusted and to
recede automatically substantially as set forth and shown.
c) The adjustable brushes, R guided by pins in eyes of the case D for freeing
the grinding surfaces from products of grinding which may adhere thereto
substantially as specified.

page_text: We RUDOLF SETZ of Clus near Balsthal (Switzerland) Mechanician and JEAN
SCHWEITER also of Clus near Balsthal (Switzerland) Mechanician do hereby declaré
the nature of this Invention for "IMPROVEMENTS IN APPARATUS FOR GRINDING AND
DESINTEGRATING GRAINS, MINERALS, ORES, AND SUCH LIKE" and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
In all the apparatus for grinding or reducing with discs rotating in a vertical
plane as hitherto constructed, the body or piece supporting the grinding disc proper
is, like this latter arranged as an entire disc supported opposite the grinding disc
proper concentrically or excentrically and having the same or a siṇaller diameter.
In these constructions either the counter disc is fixed and the grinding disc alone
rotates or both are moved so as to simultaneously produce the breaking squeezing
and pulverizing effect.
All these known constructions as well as roller mills suffer from the defect that
the grinding process that is to say the manner of the reduction is not under
perfect control and that the waste of power is correspondingly unnecessarily
increased.
In the present construction this is avoided as the grain arrives tangentially
between the rotating disc and a fixed jaw which but partly covers the disc so that
the path for the grain is precisely prescribed by suitable shape, dimensions, and
"dress" or grooving of the jaw the grinding process may therefore be controlled
both as to duration and kind in a very simple manner which is of special
importance with grain which requires to be carefully treated.
În the accompanying Drawings the apparatus is illustrated and
Figure 1 is a vertical section thereof on the lines a, b, c. d. of Figure 3.
Figure 2 vertical section on line e f g h of Figure 3.
Figure 3 plan of the apparatus partly in section.
Figure 4 and 6 representation of the fixed jaw and feeding device on an enlarged
scale.
As may be seen from these Figures only the vertical disc A on the shaft W
receives a rotary motion whose velocity is varied according to the material to be

page_text: worked up. From the same circumstance depends the choice of the material and
the "dress" or grooving and the porosity of the grinding surfaces B fixed upon
the disc A. The grinding jaw properly so called, C, has bearings in the casing D
of the apparatus slightly to one side of the centre thereof and as near as possible.
to the exterior periphery of the grinding disc as to its height it is so placed that
only the lower part which is wholly or partly grooved or "dressed" and which is
approximately radial bears towards the grinding surfaces B of the grinding disc A
leaving a suitable clearance whilst the upper part which is not grooved adjoins the
hopper so that the space between the grinding surface and grinding jaw widens
somewhat like a funnel towards the top whereby the material to be ground is well
seized and drawn between the disc and jaw..
Whilst the working is regular the jaw Cis by a spiral spring H held fast in
a fixed position facing the grinding surface.
Should however coarser pieces get between the working surfaces the jaw can
recede as the spring yields. For exact adjustment of the jaw in accordance
with the material to be ground as well as for tightening the spring provision is
made partly by hand wheel K engaging with the casing and partly by screw L and
double nuts.
The grist or material to be ground is introduced by the funnel shaped hopper
above either by a directly filled feed roller or in any other suitable manner the
material to be reduced enters to the effective parts in a direction which is perfectly
tangential to the motion of the grinding roller by reason of the above described
shape of the grinding jaw it is drawn between the latter and the grinding surfaces
and drops out through the casing D reduced or ground. The path taken by the
grist with this tangential feed is perfectly known and by suitable size shape and
grooving or dress" of the grinding jaw C any desired effect can be obtained and
the material be acted upon a more or less strongly and for a shorter or longer
period.
"
For removing such particles of comminuted inatter as settle in the grooves or
pores of the grinding surfaces a brush R is employed, which being guided by pins
in suitable eyes of the case D can by a thumb screw be suitably pressed against
the grinding surface to be brushed. As will be apparent from the Drawings the
above described arrangement by simply doubling the mechanism above set forth
admits of grinding surfaces being provided in the simplest manner at both sides
of the grinding disc and a different product may be obtained at each side.
A further advantage resulting herefrom is that axial pressure on the two sides is
equalized so that ultimately a minimum of frictional resistance is attained.
The above described apparatus is suited for grinding or reducing any kind of
material which already is in the shape of moderately small granules and the
material from which the grinding surfaces are made their "dress" and porosity,
the velocity of the grinding disc as well as size shape and "dress" of the jaw being
ruled by the material to be ground.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is,
•
1) The combination with the grinding disc A running in fixed bearings and
always in the saine plane of the fixed jaw C the lower part of which is wholly or
partly grooved or "dressed" and the upper part joining the hopper (the whole
covering a part only of the grinding face) substantially as set forth.
2) The arrangement of grinding surfaces at both sides of the grinding disc A. in
combination with the correspondingly doubled mechanisms.
3) In combination with the arrangements shown in the first and second claim.
a) The arrangement of the supply devices for the material to be reduced as well
as the partial grinding jaw C as near as possible to the outer periphery of the
rotating grinding surfaces for the purpose of introducing the material in a direction
tangential to that of the direction of motion of the rotating part.

page_text: b) The arrangement of the spring H the handwheel and set screw K and screw
bolt L with double nuts to allow the grinding jaw to be exactly adjusted and to
recede automatically substantially as set forth and shown.
c) The adjustable brushes R guided by pins in eyes of the case D for freeing
the grinding surfaces from products of grinding which may adhere thereto
substantially as specified.