Improvements in and relating to Cylinders for Producing Stencils in Type-writing Machines and the like.
Year: 1891

page_text: Date of Application, 29th Oct., 1891
Complete Specification Left, 22nd June, 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION.
Improvements in and relating to Cylinders for Producing Stencils in
Type-writing Machines and the like.
I, ALEXANDER CRAIGHEAD THOMSON, of 113 Union Street, Glasgow, Stationer
do hereby declare the nature of this invention to be as follows:-
This invention relates to cylinders for producing stencils, as used in the production
of a number of fac-simile copies. The cylinders are to be used in type-writing and
like machines.
In carrying out my invention I fit in the type-writing or other machine a roller
or cylinder, preferably of metal, which has its surface roughened with lines, grooves,
ribs, or projections or equivalent. The types of the type-writer or like machine
are made to strike on a stencil paper fitted on, or over the cylinder or roller. As
the type-writer or like machine is being worked, the stencil paper is continuously or
intermittently fed by any well-known and suitable device.
The metal roller or cylinder is, preferably, milled in a milling machine, to
produce the uneven and irregular surface, although it may be engraved or etched
for this purpose.
The roller or cylinder may be made of malleable cast steel and be hollow.
Instead of using a metal roller a wood or other roller, covered with glass or emery
paper, may be used.
Dated this 28th day of October 1891
H. D. FITZPATRICK,
Glasgow and London, Agent.
COMPLETE SPECIFICATION.
Improvements in and relating to Oylinders for Producing Stenoils in
Type-writing Machines and the like.
I, ALEXANDER CRAIGHEAD THOMSON, of 113 Union Street, Glasgow, Stationer,
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 cylinders which are to be used in typewriting and like
machines for the purpose of producing stencils, from which a number of fac-simile
impressions can be taken.
In carrying out my invention I fit in the typewriting or other machine a roller or
cylinder, preferably of metal, which has its surface roughened with lines, grooves,
ribs, or projections or equivalent. The types of the type-writer or like machine are
made to strike on a stencil paper fitted or placed on, or over, the cylinder or roller.
As the type-writer or like machine is being worked, the stencil paper is continuously
or intermittently fed by any well known and suitable device.
And in order that my said invention may be properly understood, I have here-
unto appended an explanatory sheet of drawings, whereon,
"
Fig. 1 shows part of a "Williams"" type-writer with the cylinder or “platen ” in
section.
Fig. 2 is a side elevation of the cylinder or platen Fig. 1.
Fig. 3 is an enlarged view of part of the cylinder and showing a milled "cross-line'
surface.
"
Fig. 4 is a part side view, and Fig. 5 is a cross section of a cylinder having an
irregular surface of polyhedral formation.
Fig. 6 is a front view, and Fig. 7 a side view of a hollow concave type.

page_text: Referring to the drawings:-
a is the cylinder or platen which may be fitted on to any typewriting machine,
instead of the ordinary platen, when it is desired to produce a stencil from which a
number of fac-simile impressions are to be taken. The cylinder a may be fitted on
an axle b of wood which latter is fitted on the shaft c. e are the steel types of the
machine.
The cylinder a is preferably made of a metal, such as hard steel, which is n.illed
with a fine roughened or grooved surface on it. The milling may be either
66 cross line "
as shown at Fig. 3 or be "single line," or "point,' or "pin." The
cylinder may, however, be grained or roughened by engraving or other suitable
process. The types e (see also Figs. 6 and 7) are preferably milled steel types and
are or may be hollow or concave so as to strike fairly on the surface of the cylinder.
When it is desired to produce a stencil the wax or stencil paper is fitted over the
platen and the steel types, as they are operated, strike with sufficient force to
perforate the stencil paper. The grained or roughened surface of the cylinder
ensures a uniform perforation.
The roughening should not be too pronounced as it would then be apt to cut the
stencil paper instead of perforating it.
The copies produced from a stencil which has been perforated in the manner
herein before described are similar in appearance to those produced from a "cyclo-
style" writing machine.
Instead of making the cylinders of steel or like hard metal they may be made of
glass or very hard vulcanite. When glass is the material used it may be roughened
or grained by cutting, grinding, or engraving, or by sandblast.
In Figs. 4 and 5 the platen or cylinder is shown as made of a polyhedral form on
its outside surface. The cylinder may be so made for the purpose of enabling flat
steel type to be used to strike out the perforated letters on the stencil.
This invention enables a number of fac-simile copies to be taken without the use
of carbon paper or the like.
The cylinder or platen a may be made of any other suitable material or com-
bination of materials instead of metal, glass or vulcanite.
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. In typewriting and like machines the application and use of a roller or
cylinder which has its surface roughened or grained for the purpose of producing
perforated stencils, substantially as hereinhefore set forth.
2. The combination in a typewriting machine of a roughened platen or cylinder
made of metal, glass or other suitable material, wax or stencil paper and steel types
which are caused to strike on the paper as it moves over or along with the cylinder
so as to perforate it, substantially as herein before set forth.
Dated this 20th day of June 1892.
H. D. FITZPATRICK,
Glasgow and London, Agent.