An Improvement in Fitting Cylinders with Blades Used in the Process of Macerating Materials for Pulp in the Manufacture of Paper, Millboards, and other kindred Products.
Year: 1886

page_text: Date of Application, 28th Oct., 1886.
Complete Left, 22nd July, 1887.
Complete Accepted, 26th Aug., 1887.
An Improvement in Fitting Cylinders with Blades Used in the
Process of Macerating Materials for Pulp in the Manufacture
of Paper, Millboards, and other kindred Products.
I BENJAMIN MAKIN, of Norwood Rise, Sheffield, in the county of York, steel
manufacturer, do hereby declare the nature of this invention to be as follows:-
In the use of blades B tapered in thickness in their width, fitted into grooves
prepared in the cylinder, A. with, or without retaining keys C.
Dated this 98th day of October 1886
An Improvement in Fitting Cylinders with Blades Used in the
Process of Macerating Materials for Pulp in the Manufacture
of Paper, Millboards, and other kindred Products.
I, BENJAMIN MAKIN, of Norwood Rise, Sheffield, in the county of York, steel
manufacturer 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 relates to the construction and fitting of cylinders, or rolls used in
rag engines, which are machines used for beating pulp for the manufacture of paper,

page_text: with blades, or what are known in the trade as roll bars; the object being to give
greater facility and economy in fitting the cylinders with blades and in renewing them
when worn down.
The cylinder, or roll of a rag engine is a revolving roller constructed generally
with parallel spaces, equally distributed along its surface, into which are fitted by
means of wooden wedges, dividers, slips, or fillets; blades, or roll bars; which
cylinder revolves over and in contact with a block of blades bolted together, fixed
underneath it, between which blades and those in the cylinder the material for manu-
facturing into paper is drawn and beaten into pulp by the friction of their surfaces
or edges.
The present method of constructing these cylinders necessitates the blades being
much wider than is actually necessary, or available for wear, in order to provide a
sufficient surface for securing them in the spaces, or upon the periphery of the roll,
or cylinder by means of the wooden wedges;-the blades when worn down as low as
possible, to do their work effectually, being still from one half to two thirds of their
original width and being then useless, are cast away as scrap.
In order that my invention may be clearly understood I have lodged with my
provisional specification a drawing in section with letters of reference.
According to my invention the cylinder A, whether made in one solid piece, or in
two, or more discs of any suitable material, will be constructed with grooves equi-
distant in its periphery, into which will be fitted blades B, of steel, iron, a combination
of iron faced with steel, bronze, or other suitable material, tapered in the whole, or
part of their width and secured either with, or without retaining keys C.
When the blades are sufficiently worn down they can thus be readily taken from
the cylinder and replaced with new ones at much less cost and delay; effecting a
great economy in the cost of the blades and in the proportionate loss upon them when
worn down as far as practicable, procuring a reduction in the weight of the cylinder
and an equal distribution of the blades on the surface of the cylinders, rendering them
much better suited to their requirements.
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 ;
1st. The construction of cylinders such as A whether made in one solid piece, or
in two, or more discs, provided with grooves prepared in their periphery, fitted with
blades such as B tapered in their whole, or part of their width and secured with, or
without the use of retaining keys such as C, as hereinbefore described.
2nd. The manufacture of the blades, or roll bars such as B, having tapered faces to
fit into the rag engine rolls, or cylinders A, in a finished, or partially finished state by
casting, rolling, hammering, or otherwise forming them of steel, iron, a combination
of iron faced with steel, bronze, or other suitable material, so that they can be readily
fitted into, or removed from the cylinders, substantially as hereinbefore described and
illustrated.
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