IMPROVEMENTS IN ROLLER MILLS FOR CRUSHING OR GRINDING GRAIN
Year: 1885

page_text: I, THOMAS ALEXANDER MARSHALL, of 20 Stanley Street, Glasgow, in the County
of Renfrew, North Britain, Engineer, do hereby declare the nature of my said
invention for "IMPROVEMENTS IN ROLLER MILLS FOR CRUSHING OR GRINDING
GRAIN " to be as follows, that 18 to say
-
My said Invention has for its object to improve, simplify and cheapen the
construction of roller mills for crushing on grinding grain, and relates more par-
ticularly to the parts for adjusting the rollers in relation to each other and for
seperating them without interfering with the adjustment, the improved parts being
arranged so as to secure great steadiness
In mills of the kind to which my Invention is applicable two horizontal rollers
forming a pair are arranged either on or above the other or with the plane passing
through their axes horizontal or more or less inclined In one modibcation with
the rollers in an inclined arrangement the lower roller is held in stationary
bearings the pressing, adjusting and moving parts being applied to the upper
roller Each bearing of the upper roller is held in a box-like block or slide fitted
accurately in an inclined guide slot in the framing, and within the block there
18 fitted a spring with an adjusting screw for applying the required pressure, the
spring allowing the roller to yeild when foreign matters of excessive hardness
accidentally get between the rollers Each block or slide has also fitted to it a
screw spindle which can turn relatively to it whilst moving it up or down the
guide slot, and this screw spindle works through an internally screwed hole
formed in a cover fixed to the framing On the end of the screw spindle outside
of the cover a deep worm wheel 18 keyed and has gearing with it a worm on a
horizontal shaft which has also on it a worm for acting similarly on a worm wheel
connected with similar parts at the other end of the roller The worm shaft bas
one or more hand wheels on it for turning it for the purpose of moving the upper
roller towards or from the lower one, whilst for adjusting the upper roller so as
to be parallel to the lower one the worms are adjusted on their shaft or the worm
wheels are adjusted on the screw spindles
Instead of applying the pressing, adjusting and moving parts to the upper roller
the springs or pressing details may be applied to the upper roller, and the screw
spindles and other adjusting and moving parts may be applied to the lower roller
or between the upper and lower rollers.
Dated this think first dan of Mouch 100%

page_text: COMPLETE SPECIFICATION
Improvements in Roller Mills for Crushing or Grinding Grain.
I, THOMAS ALEXANDER MARSHALL, of 20 Stanley Street, Glasgow, in the County
of Renfrew, North Britain, Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, that is to say
-
My said Invention has for its object to improve, simplify, and cheapen the
construction of roller mills for crushing or grinding grain, and relates more par-
ticularly to the parts for adjusting the rollers in relation to each other, and for
separating them without interfering with the adjustment, the improved parts
being arranged so as to secure great steadiness
In mills of the kind to which my Invention is applicable two horizontal rollers
forming a pair are arranged either one above the other or with the plane passing
through their axes horizontal or more or less inclined On an accompanying sheet
of explanatory diawings parts of a modification are shown with the rollers in an
inclined arrangement, figure, 1, being a vertical section of a machine having two
pairs of rollers, the left-hand half of the section being as taken through the rollers,
whilst the right-hand half shows the framing in elevation and the roller bearings
in section Figure, 2, 1s a section as taken in the plane passing through the axes
of the two rollers In this modification the end journals, A, of the lower roller, B,
are held in bearing bushes, C, which are fixed at the lower end of guide slots
formed in each end frame, D The pressing, adjusting, and moving parts are
applied to the upper roller, E, which has on each of its journals, F, a bearing
bush, H, externally shaped to fit in a box-like block or slide, J, fitted accurately in
the inclined guide slot in the end frame, D A conic-volute spring, K, is applied Bo
as to tend to hold the bearing bush, H, in its lowest position in the block or
slide, J, a stud or bolt, L, being fixed in the bottom of the bush, H, and the
spring, K, being compressed between the bottom of the block or slide, J, and a
washer and a pair of screw nuts, M, on the stud or bolt, L The pressure of the
upper roller, E, depends on the springs, K, acting on its end journals and this
pressure can be adjusted by screwing the nuts, M, more or less, whilst at the
same time the pressure is a yielding one the springs allowing the upper roller to
yield when foreign matters of excessive hardness accidentally get between the
rollers. Instead of the screw nuts, M, a small internally screwed wormwheel may
be put on each stud, L, and a worm gearing with the worm wheel may be applied
on a spindle carried in bearings on the end frame, D, with its outer end con-
veniently accessible Each block or slide, J, has also fitted to it a screw spindle, N,
which can turn relatively to it whilst moving it up or down the guide slot, and
this screw spindle, N, works through an internally screwed hole formed in a
cover, P, fixed to the framing On the end of the screw spindle, N, outside of the
cover, P, a deep worm wheel, Q, 18 keyed and has gearing with it a worm, R, on a
horizontal abaft, S, wbich has also on it a worm for acting similarly on a worm-
wheel connected with similar parts at the other end of the roller The worm
shaft, S, has one or more handwheels, T, on it for turning it for the purpose of
moving the upper roller, E, towards or from the lower one, B, whilst for adjusting

page_text: the upper roller, E, so as to be parallel to the lower one, B, the worms, R, are
adjusted on their shaft, S, being fitted so that they can be turned on the shaft, and
being fixed after being adjusted by pinching screws, U, acting on sinall cods or
blocks, fitted in recesses inside the worm bosses and bearing on the shaft
worm wheels, Q, might be made adjustable instead of the worms
Or the
Instead of applying the pressing, adjusting, and moving parts to the upper
roller, as described and as shown in the accompanying drawings, the springs or
pressing details may be applied to the upper roller, and the screw spindles and
other adjusting and moving parts may be applied to the lower roller or between
the upper and lower rollers
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
The making of roller mills with independent parts for adjusting and applying
pressure by springs, and parts for moving the rollers apart and for adjusting them
so as to be parallel, such parts being arranged and combined in the improved
manner substantially as herein before described