Improved Means for Driving the Rollers of Roller Mills.
Year: 1885

page_text: Improved Means for Driving the Rollers of Roller Mills.
I, ANDREAS MECHWART of Buda Pesth in the Kingdom of Hungary, Austro-
Hungarian Empire, Engineer do hereby declare the nature of my invention
for IMPROVED MEANS FOR DRIVING THE ROLLERS OF ROLLER MILLS to be as
follows:-
This invention relates to a novel arrangement for driving by means of belts,
horizontal four-roller mills, the object being to avoid interference with the adjust-
ment of the rollers and to facilitate the tightening up of the bands.
Supposing the second and third rollers to be the fixed rollers, and the first and
fourth the adjustable rollers, I drive the second and third by means of balting
connected with a common driving shaft. On one side of the machine I provide
band pulleys on the axles of the first and third rollers, and a pair of tension pulleys
having their bearings in an adjustable radius arm and set one immediately above
the other.
From the underside of the lower tension pulley I lead a band to the pulley
on the axle of the first roller and from this pulley under the second or upper of the
tension pulleys thence round a pulley on the axle of the third roller and down from
that pulley to the lower tension pulley.
A sector rack on the free end of the radius arm, in gear with a worm, serves to
hold down that arm and retain it and the pulleys which it carries in a position to
tighten the band, but equivalent means of adjustment, as for example regulating
screws, may be employed.
When the band becomes slack it will only be necessary to turn the worm, and
the two tension pulleys acting upon separate loops of the band will quickly tighten
it by stretching it at two points for one movement of the pulleys.
On the opposite side of the machine a similar arrangement is provided with this
difference, namely that the band from the lower tension pulley passes round a
pulley on the axle of the fourth roller, then down under the upper tension pulley,
up round a pulley on the axle of the second roller and thence to the lower tension
roller.
These tension rollers being carried by an adjustable radius arm, will enable the
band on that side of the machine to be adjusted with like facility to that on the
opposite side.

page_text: Improved Means for Driving the Rollers of Roller Mills.
I ANDREAS MECHWART, of Buda Pesth in the Kingdom of Hungary, Austro-
Hungarian Empire, 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 :-
This invention relates to a novel arrangement for driving, by means of belts,
horizontal four-roller mills, the object being to avoid interference with the adjust-
ment of the rollers, and to facilitate the tightening up of the bands.
In the accompanying drawing, Fig. 1 shews in side elevation so much of a four-
roller mill, with my invention applied thereto, as will serve to explain the manner
of carrying out my improved mode of driving; and
Fig. 2 is a plan view of the same.
The system of driving which I adopt is virtually the same for both sides of the
mill, but the full illustration of the application of the invention to one side, will
serve to illustrate my manner of proceeding on both sides of the mill.
In these Figures, the rollers 2 and are the fixed rollers and 1 and 4 the adjust-
able rollers. The rollers 2 and 3 are driven by means of belting connected with a
common driving shaft as usual, and froin the axles of these rollers the motion for
driving the rollers 1 and 4 are respectively taken. Thus the roller 1 will be driven
from the axle of the roller 3, and the roller 4 from the axle of the roller 2.
On the side of the machine shewn in Fig. 1, I provide band pulleys ab on the
axles of the first and third rollers, and a pair of tension pulleys c d having their
bearings in an adjustable radius arm e pivotted to the main framing. These
tension pulleys are set immediately one above the other, and the free end of the
radius arm is formed into a sector rack f, into which gears a worm g for adjusting
the position of the radius arms. From the underside of the lower tension pulley d,
I lead a driving band h up to and over the pulley a on the axle of the first roller,
and from this pulley, under the tension pulley c; thence around the pulley b on the
axle of the third roller, and down from that pulley to the tension pulley d.
The worm g, which is mounted in bearings in the framing, by gearing into the
sector rack f, serves to hold down that arm, and retain it and the pulleys which it
carries in a position to tighten the band, and by simply turning the worm, any
slack in the band may be taken up. Or instead of this tightening arrangement,
equivalent means of adjustment, as for example regulating screws, may be
employed.
It will now be understood that when the band becomes slack, and the worm is
turned to depress the radius arm with its pulleys, these pulleys will, by reason of
their acting upon separate loops of the band, quickly tighten it by stretching it at
two points for one movement of the pulleys.
On the opposite side of the machine, a similar arrangement of pulleys and band
is provided, with this difference, namely, that the band h, see Fig. 2, starting from
the lower tension pulley, passes round a pulley a* on the axle of the fourth roller,
then down under the upper tension pulley c*, up round a pulley b* on the axle of
the second roller, and thence to the lower tension roller.

page_text: These tension rollers being also carried by an adjustable radius arm, will enable
the band on that side of the machine to be adjusted with like facility to that on
the side shewn at Fig. 1.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
In a four roller mill, the arrangement of driving bands and pulleys as described,
whereby the tightening of the bands on the opposite sides of the mill is facilitated,
and the adjustable rollers are left free to yield to any overfeed, or to the passage of
any hard substance through the bite of the rollers.
Dated this 24th day of December 1885.
NEWTON & SON,
Agents for the Applicant.