Pneumatic Inking Rollers for Lithographic and Letterpress Printing Machines.
Year: 1896

page_text: Date of Application, 29th Aug., 1898
Complete Specification Left, 29th May, 1897-Accepted, 28th Aug., 1897
SIONAL SPECIFICATION.
Pneumatic Inking Rollers for Lithographic and Letterpress
Printing Machines.
I, JOHN STEVENSON of 3 Queen's Elms, Belfast, Manufacturing Stationer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to the inking rollers used in lithographic and letterpress
printing machines and it consists in the substitution of a pneumatic cushion for the
Hannel or other stuffing presently used.
In carrying out the invention a liollow rubber sleeve or cushion is fitted over the
roller stock and over this sleeve is slipped a prepared skin as at present used for
lithographic rollers and this skin is laced up at the ends in order to keep it in
place.
Air is pumped into the hollow cushion through a suitable non-return valve
fitted at one end of it.
When the rollor is thus inflated perfect support is given to the skin at every part
whilst the clasticity is iminensely superior to the old arrangement.
The pneumatic roller is not liable to crease or formn into ridges as with the present
rollers.
Dated this 28th day of August 1896.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.
Pneumatic Inking Rollers for Lithographic and Letterpress
Printing Machines.
I, JOHN STEVENSON, of 3 Queen's Elms, Belfast, Manufacturing 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 the inking rollers used in lithographic and letterpress
printing machines and it consists in the substitution of a pneumatic cushion for the
Hanuel or other stuffing presently used.
And in order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings which show, by way of example or
illustration, one convenient mode of carrying the invention into effect or
practice.

page_text: Fig. 1 is a side elevation of the pneumatic inking roller.
Fig. 2 is a longitudinal section of the roller.
Fig. 3 is an end view of the roller.
In carrying out the invention I make a stock d having reduced ends d' and
externally flanged discs d². Stretched tightly over the flanged ends d³ is a rubber
sleeve or tube which is secured tightly at each end against the inner faces of the
flanges by means of discs f. As shown at Fig. 2 those discs have thickened rims f
which are slightly bevelled so as to squeeze the ends of the rubber tube b tightly
against the inner faces of the flanges d³ which latter are also slightly bevelled or
angled. The discs f, which are movable upon the ends d', can be held tightly in place
by means of jam nuts g working on the screw thread & cut on the ends d. By
screwing up the nuts g the discs f may be made to bite the ends of the rubber sleeve b
very tightly.
The space around the stock d enclosed by the rubber sleeve b can be inflated with
air or gas through a non-return valve i of any suitable and well known description, such
as, for instance, a valve of the kind cominonly used for inflating the pneumatic tyres
of cycles. The valve is shown as screwed into one of the disc ends d' of the
stock d. In order to gain access to the valve an opening h is made in the right
hand disc f.
Over the rubber sleeve b a prepared leather or skin covering is fitted and is or may
be laced up at the ends in the usual manner.
The leather or skin covering may be similar to that commonly used for lithographic
rollers.
When air or gas is pumped into the hollow roller through the non-return
valve i the rubber sleeve 6 is inflated and is thus made to give a perfect support to the
skin or leather covering a at every part.
The pneumatic roller whilst possessing increased elasticity is not so liable to crease
or to form into ridges as the present stuffed rollers.
The invention is applicable to all classes of inking rollers whether used for machine
or hand work.
Although I have shown one method of carrying out the invention I do not confine
myself thereto as alterations or modifications can obviously be made on the arrange-
ment shown.
Having now particularly described, and ascertained the nature of any said
invention and in what manner the same is to be performed, I declare that what I
consider novel and desire to claim is :-
1. The application and use for lithographic and letterpress printing machines
of an inflated inking roller substantially as hereinbefore set forth.
2. A pneumatic inking roller coustructed substantially as hereinbefore described
with reference to the drawings annexed.
Dated this 26th day of May 1897.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.