Improvements in or relating to Roller Mills.
Year: 1899

page_text: Date of Application, 8th June, 1899-Accepted, 5th Aug.,
1899
Improvements in or relating to Roller Mills.
I, RUDOLPH FREDERIK POVL RUBOW, of. Malmoe, Kingdom of Sweden, Engineer,
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:-
The present invention relates to a roller mill for rolling at high pressure, and
especially adapted for working bran, husks and other refuse in the milling industry,
so as to give it a suitable consistency and make it better adapted for food for cattle
or similar purposes.
The accompanying drawing shows a machine constructed according to this
invention, partly in side elevation, partly in section. a is a frame supporting one of
the crushing rollers b, having trunnions c resting in bearings d on the frame. The
trunnions c project at both sides beyond the bearings and carry a pulley or pulleys c
driven by suitable means, for instance by a belt f.
The frame a has another pair of bearings g supporting the trunnions h of a heavy
fork or equivalent in such a way that the fork inay turn round on its trunnions h.
Between the two arms of the fork i is placed a roller which may be of the same
size as the roller b, its trunnions & resting in bearings in the arms of the fork i. By
this arrangement if the fork i, is moved in the direction indicated by the arrow, the
roller k, whose trunnions are placed above the trunnions h, will be moved towards the
roller b, while it will be removed from this roller if the fork be moved in the opposite
direction. The movement of the fork i is effected by means of the following device.
The fork i is provided with a vertical hole through which a cylindrical rod m passes,
the latter having a groove in which a spline or feather on the fork i may engage in
such manner that the rod m may move up or down but may not rotate.
Immediately below the fork i the rod m is provided with a collar n or projection
between which and a bracket o on the frame a strong spring p is arranged. The
rod m passes right through the spring p and projects into a hollow space in the
shoulder o so that its movement is not hindered as the fork i is raised or lowered.
Above the fork is arranged a worm-wheel q the boss of which
provided with a flange resting against the upper surface of the fork and kept in
prolonged and
position by a cover 8 attached to the fork in such manner that the worm-wheel may
be freely turned round its axis. The worm-wheel is bored out axially and screwed on
to the upper part of the rod m.
A wormt turned by means of a hand-wheel u gears with the worm-wheel q. By
means of the above described arrangement the roller may be pressed more or less
against the roller b. As the hand-wheel u is turned the worm-wheel also turns and
according to the direction in which it turns, the rod m will be raised or lowered. In
the latter case the collar n will compress the spring p resting with its lower end
against the fixed bracket o, and the spring will consequently take up the pressure
from the collar n. This action will through the screw on the rod m, the worm-
wheel g, and the cover & be transmitted to the fork i and raise the same, whereby the
roller will be forced against the roller b with a pressure corresponding to the tension
of the spring v.

page_text: The material to be rolled is fed into a hopper above the machine, the bottom of the
hopper being provided with rollers vv in order to obtain a uniform feed. The
material drops down into a hopper w and thence between the rollers band k.
Scrapers a are placed below the rollers, for the purpose of scraping off any material
adhering thereto. The rolled material drops froin the rollers down below the machine
where it is collected in a suitable manner.
Having now 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 is :-
1. A roller-mill comprising two rollers one of which is carried in a fork or the like,
arranged to turn round trunnions in the frame, the free end of the said fork being
acted upon by a spring resting at its other end against a fixed point on the frame and
means whereby the spring may be given a tension corresponding to the desired roller-
pressure, substantially as described.
2. In a roller mill of the kind described means for tightening the spring comprising
a screw-rod m capable of moving vertically but not of rotating in the fork a collar
upon said rod against which one end of the spring bears and a worm-wheel such
as q, and serving as a nut for the screw-rod and means for turning said worm wheel
substantially as described.
3. The complete roller mill substantially as described or illustrated in the accom-
panying drawings.
Dated this 8th day of June 1899