IMPROVEMENTS IN ROLLER MILLS
Year: 1877

page_text: LETTERS PATENT to Carl Pieper, of Dresden and Berlin, for the Invention of
"IMPROVEMENTS IN ROLLER MILLS." A communication from August Nagel
and Reinhold Kaemp, of Hamburg.
Sealed the 24th April 1878, and dated the 5th November 1877.
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office of
the Commissioners of Patents on the 5th November 1877.
"
CARL PIEPER, of Dresden and Berlin. IMPROVEMENTS IN ROLLER MILLS." -A
communication from August Nagel and Reinhold Kaemp, of Hamburg, Germany.
This Invention relates to an improved regulating mechanism of the adjustable
roller of roller mills for the manufacture of flour. In all such mills it is necessary
to make one of the rollers adjustable for the purpose of regulating the pressure, or
as the case may be, the distance between the rollers.
Hitherto the bearings of the adjustable roller have usually each been placed in
a separate guide, and provided with a spring and a regulating screw; but this
arrangement is objectionable, as it is difficult to regulate both bearings in such a
manner as to cause a perfectly equal pressure on both ends of the roller; and, more-
over, this mode of adjustment is very inconvenient.
According to the present Invention the adjustable roller revolves in bearings,
forming part of a strong double branched bell-crank lever, the pivots of which are
below the said bearings. The two short arms of the lever are consequently vertical,
or nearly so, whilst the long arm, which forms a bow from one bearing of the roller
to the other, is horizontal. The adjusting mechanism placed in the centre of this
bow consists of an adjusting screw, the lower end of which presses with a collar on.
a strong spring bearing on the bed plate of the rollers, whilst the upper end is
screwed through the boss of a worm wheel which revolves in a bearing fixed to the
said lever. This worm wheel is operated by a worm and hand wheel, so that the
latter, being turned, the said spring will be compressed or allowed to expand, as the.
case may be, the pressure between the rollers being consequently increased or
diminished respectively. As soon as the pressure of the lever is taken off from the

page_text: spring altogether the adjustable roller will be drawn away from the roller revolving
in fixed bearings. The spring may however be kept at a certain tension by com-
pressing it on the lower end of the adjusting screw by a separate nut.
A pointer may be fixed to the top of the adjusting screw for indicating on a scale
the pressure applied to the rollers.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Pieper in the Great Seal Patent Office on the 27th April
1878.
A
CARL, PIEPER, of Dresden and Berlin. "IMPROVEMENTS IN ROLLER MILLS."
cominunication from August Nagel and Reinhold Kaemp, of Hamburg, Germany."
This Invention relates to an improved regulating mechanism of the adjustable
roller of roller mills for the manufacture of flour. In all such mills it is necessary
to make one of the rollers adjustable for the purpose of regulating the pressure, or,
as the case may be, the distance between the rollers.
Hitherto the bearings of the adjustable roller have usually each been placed in a
separate guide, and provided with a spring and a regulating screw; but this arrange-
ment is objectionable, as it is difficult to regulate both bearings in such a manner as
to cause a perfectly equal pressure on both ends of the roller; and, moreover, this
mode of adjustment is very inconvenient.
The improvements constituting the subject matter of the present Invention are
represented on the annexed Sheet of Drawings.
a
Fig. 1 is a top view; Fig. 2, a side elevation; Fig. 3, a transverse section; Fig. 4,
longitudinal section; and Fig. 5, a front elevation of the roller mill; and Fig. 6 is
a detail section through the adjusting gear..
The adjustable roller d revolves with its journals e¹ and e² in bearings, forming
parts of a strong double branched bell-crank lever H, the pivots of which, are below
the said bearings. The two short arms f, e¹, and f, e², of the lever are consequently
vertical, or nearly so, whilst the long arm, which forms a bow from one bearing of
the roller d to the other, is horizontal. The adjusting mechanism placed in the
centre of this bow consists of an adjusting screw h, the lower part of which presses
with a collar on a strong spring or series of springs g, of any suitable design, bearing
on the bed plate of the roller. The upper end of the screw h is screwed through
the boss of a worm wheel i revolving in a bearing.u, which is either fixed to the
lever H, or which bears with pivots or projections on the under side of other pro-
jections within the casing K attached to lever H. This worm wheel is operated by
a worm keyed on shaft l' of hand wheel 18. The casing K is provided with a
loose cover or disk t having a boss with smooth bore through which the screw h
passes. Within the boss however there is a feather p fitting into a groove of the
screw. The cover t may be locked to the casing K by a pin q. Supposing this pin
to be in its place, as in Fig. 3, then if the hand wheel 2 is turned, the worm wheel
will be screwed up or down on the screw h, which is prevented from turning by,
the feather p and pin q. In consequence the spring g is either compressed or

page_text: allowed to expand, as the case may be, the pressure between the rollers being
increased or diminished respectively. As soon as the pressure of the lever H is
taken off from the spring g altogether the adjustable roller d will be drawn away
from the roller c, but whatever the distance between the rollers may be, the
crushing power exercised by roller d in any grain or material larger in size than the
said distance will correspond to the tension of the spring 9, and, moreover, the
distance between the rollers to which they are once adjusted will always remain
the same.
The tension of the spring g may be varied by turning the nut x on the lower end
of the screw h. For the purpose however of facilitating this operation means have
been provided for turning the screw h in the nut x by the hand wheel 1, the nut
remaining stationary. To this end the pin q which was used for locking the cover t
to the casing K is inserted into another hole of the cover t corresponding to a hole
in the worm wheel i, as shown in Fig. 6. If the hand wheel is now turned the
worm wheel will carry the covert along with it, and the latter will drive the screw
by the feather p. The screw is thereby turned in the nut x (which, of course, must
be prevented from revolving by any suitable means), and the tension of the spring
is increased or diminished according to the direction in which the screw was
rotated.
A pointer may be fixed to the top of the adjusting screw for indicating on
a scale the pressure applied to the rollers, and a similar pointer at the lower end
may indicate the tension of the spring when the rollers are not in contact with
each other.
The other parts of the mill will be understood from the Drawing without any
further description, and, moreover, they do not constitute any part of this Invention.
By means of the specified adjusting mechanism the rollers may be regulated with
regard to each other during the crushing process to any degree of nicety desired.
Moreover, as the rollers when once regulated to a certain distance between them
cannot approach each other closer, while on the other hand, the pressure with which
the adjustable roller acts on the corn, &c., to be crushed, is invariably proportional
to the tension of the spring at the time being, the product obtained will be, as far
as possible, of equal grain.
Having thus described the nature and object of this Invention, and the manner
in which it is or may be carried out in practice, I hereby declare that I claim as
new and important features of the same,-
•
1. In combination with the adjustable roller of a roller mill, the bell-crank lever H,
regulating screw h, spring or springs g, worm wheel i, and, worm 7, substantially as
and for the purpose specified.
2. In combination with the adjustable roller of a roller mill the bell-crank
lever H, regulating screw h, spring or springs g, worm wheel i, worm l, cover
or disk t, feather p, pin q, and nut x, substantially as specified and for the purpose
set forth.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal, this Fourteenth day of April, in the year of our Lord One thousand
sight hundred and savorty night
CARL PIEPER. (L.S.)