Improvements in Sugar Cane Mills.
Year: 1888

page_text: Improvements in Sugar Cane Mills.
I, Alfred CHAPMAN of the firm of Fawcett, Preston and Company of 17 York
Street, Liverpool, Engineers, do hereby declare the nature of this invention to be as
follows:-
My invention has reference to sugar cane mills of the kind in which one or more
small feed rolls are employed in lieu of the first roll of a three roll mill whereby the
trash returner can be dispensed with and the two main rolls can be placed nearer the
same level than in a three roll mill.; the expressed juice is thus not so liable to be
carried beyond the squeezing point and to become absorbed by the megass. The cane
receives a partial squeeze between the feed rolls and the first main roll, but the
effective squeeze is given between the two main rolls. A mill of the kind referred to
is described in the Specification of Letters Patent No. 13709 of 1851.
The invention consists first, of a special combination or arrangement of parts of
these mills as hereinafter described whereby their strength and durability is increased;
and, secondly, of a special arrangement of megass knife or scraper which removes the
megass from the roll at the earliest possible moment and thereby prevents it absorbing
expressed juice which is carried round with the roll.
In my improved mill I employ two or more (preferably two) small feed rolls and
two main rolls arranged as is usual in mills of this description. In each of the
caps of the second main roll I prefer to use in lieu of the springs or spring plates
heretofore employed a hydraulic cylinder the rain of which bears against the brasses
in which the trunnions of the roll work; by this means.a desirable degree of elasticity
is given to the caps so that when hard or accumulated portions of cane are passing
between the rolls the second roll may be able to yield slightly. Thoroughfare bolts
braced up by nuts in the usual manner are carried through the caps of the two main
rolls so as to hold these caps together.
Other bolts similarly tightened up by nuts are passed through the headstocks and
into the frame of the mill and hold the headstocks together against the strain pro-
duced by the first main roll and the feed rolls; one of these bolts on each side

page_text: passes through the cap of the first main roll and through a distance piece placed
between the headstock and the frame of the mill.
The megass knife or scraper hereinbefore referred to is carried up well over the
second main roll so that its edge is at such a position as to remove the megass
from this roll as soon as practicable after the sqeezing operation and thereby prevent.
it absorbing the juice which is carried round with the roll. The knife should be
hinged at a convenient point so that it can be lifted away from the roll from time
to time to allow of the removal therefrom of particles of megass adhering to it.
Dated this 19th day of March 1888.
J. C. MEWBURN,
169, Fleet Street, London,
Agent.

page_text: 1, ALFRED CHAPMAN of 17 York Street, Liverpool, 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:—
My invention has reference to sugar cane mills of the kind in which one or more
small feed rolls are employed in lieu of the first roll of a three roll mill, whereby the
trash returner can be dispensed with and the two main rolls can be placed nearer the
same level than in a three roll mill; the expressed juice is thus not so liable to be
carried beyond the squeezing point and to become absorbed by the megass. The cane
receives a partial squeeze between the feed rolls and the first main. roll, but the
effective squeeze is given between the two main roll. A mill of the kind referred to
is described in the Specification of Letters Patent. No. 13,709 of 1851.
The invention consists, first of a special combination or arrangement of parts of
these inills as hereinafter described, whereby their strength and durability is increased,
and secondly of a special arrangement of megass knife or scraper which removes the
megass from the roll at the earliest possible moment, and thereby prevents it absorbing
expressed juice which is carried round with the roll.
In my improved mill I employ two or more (preferably two) small feed rolls and
two main rolls arranged as is usual in mills of this description. In each of the caps
of the second main roll I prefer to use, in lieu of the springs or spring plates
heretofore employed, a hydraulic cylinder the ram of which bears against the brasses
in which the trunnions of the roll work; by this means a desirable degree of elasticity
is given to the caps, so that when hard or accumulated portions of cane are passing
between the rolls, the second roll may be able to yield slightly. Thoroughfare bolts
braced up by nuts in the usual manner are carried through the caps of the two
main rolls so as to hold these caps together. Other bolts, similarly tightened up by
nuts, are passed through the headstocks and frame of the mill, and hold the headstocks
together against the strain produced by the first main roll and the feed rolls; one of
these bolts on each side passes through the cap of the first main roll and through a
distance piece placed between the headstock and the frame of the mill.
The megass knife or scraper herein before referred to is carried up well over the
second main roll so that its edge is at such a position as to remove the megass from
this roll as soon as practicable after the squeezing operation and thereby prevent it
absorbing the juice which is carried round with the roll. The knife should be hinged
at a convenient point, so that it can be lifted away from the roll from time to time to
allow of the removal therefrom of particles of megass adhering to it.
The accompanying drawing represents a sugar cane mill constructed according to
my invention. A, B are the two feed rolls and C, D the two main rolls. In each of
the caps of the second main roll D is a hydraulic cylinder E, the ram F of which
bears against the brass G, in which the trunnion of the roll works. H, H are
thoroughfare bolts braced up by nuts I, I, and carried through the caps of the main

page_text: rolls so as to hold these together. K, K are other bolts tightened up by nuts L, L,
and passed through the headstocks M. and frame N of the mill and through the
timbers on which the mill is seated, thereby holding the headstocks together against.
the strain produced by the first main roll C and the feed rolls. One of the bolts K on
each side of the mill passes through the cap P of the first main roll C, and through a
distance piece Q placed between the headstock M and the frame N of the mill. R is
the megass knife or scraper; it is carried up over the second main roll D so that its
edge is at such a position as to remove the megass from this roll as soon as practicable
after the squeezing operation, as has been already explained. This knife is hinged
at S, so that it can be lifted away from the roll from time to time for the purpose of
cleaning its own weight keeping it in place while the work of crushing is proceeding.
Tis a knife to scrape the roll C; it is.kept up to its work by the balance weight Z.
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 1
claim is :-
1. The special combination or arrangement of parts of sugar cane mills substantially
as hereinbefore described and represented in the accompanying drawing.
2. In sugar can mills of the kind herein. referred to, the special arrangement of
megass knife or scraper as hereinbefore described and represented in the accom-
panying drawing.
1
1000
J. C. MEWBURN,
169, Fleet Street, London,
Patent Agent.