IMPROVEMENTS IN MILLS FOR ROUGH GRINDING CORN AND THE LIKE MATERIALS
Year: 1879

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Solicitors, at Frankfort on the Main, in the Empire of Germany, for the
Invention of "IMPROVEMENTS IN MILLS FOR ROUGH GRINDING CORN AND
THE LIKE MATERIALS" A communication from Martin Moller, of Kollmar,
in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 16th December 1879.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "IMPROVEMENTS IN MILLS
FOR ROUGH GRINDING CORN AND THE LIKE MATERIALS." A communication from
Martin Möller, of Kollmar, in the Empire of Germany.
The Invention relates more particulary to roller mills for rough grinding corn or
similar materials, and consists chiefly in constructing the jaw against which the
toothed surface of the roller or drum is worked with alternate plates of iron and
steel, the latter made to project beyond the iron plates so as to form the effective
part of the grinding surface, the said plates being held together by regulating
screws attached to a shackle which is itself attached to a spring, and serves to
hold the said plates. The distance between the jaw and the drum, and therefore
the fineness of the product, can be regulated by a screw and handwheel, while
another screw serves for regulating the tension of the spring, and the whole jaw
and holder can be removed from the drum by a hand lever. The feeding apparatus
consists preferably of an endless belt held tight by a (wooden) spring connected with
one of the belt pulleys, of a movable slide intended for regulating the supply of grain
from a hopper to which the slide is attached, and small hoppers for receiving the
corn from the belt and delivering it between the grinding surfaces. The apparatus
for sharpening or dressing the grinding surface of the drum, which constitutes a
part of this Invention, consists of a steel tool or chisel attached to a rack placed
parallel to the axis of the drum, and moved along by turning a toothed pinion into
which the rack is gearing, the rotation of the drum being effected by means of a
toothed wheel mounted on the drum shaft, and having only one third (or other
suitable part) of the number of teeth of the drum. Three levers arranged at a
distance each of the pitch of the toothed wheel are one after the other made to
engage in the tooth wheel, so that the depression of one lever moves the drum one
tooth, so as to present a new tooth to the chisel.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frank Wirth in the Great Seal Patent Office on the 8th
June 1880.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "IMPROVEMENTS IN MILLS
FOR ROUGH GRINDING CORN AND THE LIKE MATERIALS," A communication from
Martin Möller, of Kollmar, in the Empire of Germany.
The improved mill is represented on the accompanying Drawing, and consists of
the following chief parts 1st, the drum A made of iron, steel, or other suitable
material; 2nd, the truss B; 3rd, (the feeding apparatus C; 4th, the sharpening
apparatus D. The drum (A) is preferably made three feet diameter and one foot
wide, but it will be understood that the size of this as well as of other parts of
the machine depends upon the work the machine has to do. The truss (B)
consists of a shackle (a) attached to a spring b and provided with two regulating
screws a, which latter serve to hold a number of steel and iron plates d and c, the
steel plates c being so arranged that they somewhat project beyond the iron plates d.
A screw and hand wheel P are provided to regulate the space between the plates
held in the shackle and the drum A, whereby the degree of fineness to which the
material is reduced is also regulated. A hand screw H serves to alter the tension
of the spring b. By turning the lever M in the direction of the arrow the whole
truss is moved away from the drum. The feeding apparatus C consists of an
endless belt f running on two rollers i and i, said belt being held tight by the
wooden spring g of the regulating slide h held by the guide piece x, together with
the gearing apparatus k for raising or lowering the said slide h, thus regulating
the amount of corn fed by the belt f. Suitable hoppers e and e' serve to guide the
corn after it has left the belt f. Fig. 3 shows in a larger scale a part of the
circumference of the drum, and the arrangement of steel and iron plates forming
the jaw. The sharpening apparatus D shown in Fig. 2 consists chiefly of a rack 7
gearing into the pinion m, and carrying a cutter n so attached as to meet the teeth
of the drum at a cutting angle; it will thus be seen that upon the pinion being
worked the steel cutter will be drawn along the teeth of the drum A, thus
sharpening or dressing the same. The toothed wheel p has /, fewer teeth than
the drum A (ratio between number of teeth 1 : 3), and is placed in the required
position by means of three levers, the distance between two adjoining levers being
1/3 of the pitch of p, so that by pressing them in rotation into the teeth of the
wheel p, the latter is moved one tooth, and consequently the drum three teeth,
thus each time a lever is pressed into the tooth wheel p the drum A moves one
tooth forwards, so that any or all the teeth of the drum can be sharpened at will.
Before applying the sharpening apparatus the feeding apparatus is removed from
the mill.
CLAIMS.
1. The truss B provided with steel and iron plates and suitable screws, together
with the spring b in combination with the drum A, substantially as described.
2. The sharpening apparatus, substantially as and for the purpose described.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand 4
and seal, this Fifth day of June, A.D. 1880.

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