Inking Rollers for Lithographic and Letterpress Printing Machines.
Year: 1898

page_text: Date of Application, 18th Feb., 1898-Accepted, 30th Apr., 1898
COMPLETE SPECIFICATION.
Inking Rollers for Lithographic and Letterpress Printing Machines.
I, JOHN STEVENSON, of 13, 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 porticularly 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 is an improvement upon my prior invention No. 19094
of 1896.
And in order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon,"
Fig. 1 is a longitudinal section of the roller.
Fig. 2 is a part longitudinal section of the roller to an enlarged scale.
Fig. 3 is a cross section on the line X--X Fig. 2.
Fig. 4 is an end view.
In this invention the stock a of the roller is made with elongated and reduced
ends a¹, a. The end a¹ has a hole b bored in it which communicates with a
channel 6. This hole is closed at its end by any well known form of non-return
valve c.
Collars d, d, are fitted on the stock, at each end, and these collars are
provided with inclined or bevelled rims or edges e. Movable washers f are also
fitted on the stock and these washers are provided with inclined or bevelled edges
corresponding to the bevelled rims of the collars d, d¹. g, g¹, are jam nuts which
work on the screw threads h of the stock.
The fluid tight rubber sleeve i is fitted over the collars d, d, and is held securely
and tightly in place at the ends by being pinched between the rims of the collars
and the bevelled faces of the washers as clearly shown at Fig. 2. By screwing up
the jam nuts g, g', the ends of the sleeve i can be squeezed or pinched between the
washers and collars to any desired extent.
Stretched over the rubber sleeve i is a flexible and yet inelastic cover j made of a
fabric, such as linen, canvas, or strong cotton. The cover may be made by wind-
ing the fabric round a roller until the desired strength and thickness of material
is obtained.
Stretched over the inelastic cover j is a leather or skin cover k such as generally
used for lithographic rollers. This cover may be held in place at the ends by
lacing, as usual, or by wires l.
The space between the fluid tight sleeve and the stock a is loosely filled or
packed with hair, felt, cotton wool, or other like material m, and is also, in the case
of a light roller, inflated with air or gas, and, in the case of a heavy roller, filled
with water or other suitable liquid, which is pumped in through the non-return
valve.
The loose packing preserves the shape of the roller even when not fully inflated
or filled with fluid.
The inelastic cover j being of exactly the same strength throughout preserves a
perfectly even outline when the roller is inflated and at the same time expands

page_text: sufficiently to tighten under the outer cover k. When this cover j is not used the
outer skin tends to form into ridges.
A roller constructed in the manner before described and inflated with air or
filled with water, as the case may be, is found to be a decided improvement on the
ordinary inking rollers.
The invention is applicable to all classes of inking rollers whether used for
machine or hand work.
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
consider novel and desire to claim is :-
1. The combination, in inking rollers, of a stock, an elastic sleeve fitted fluid tight
upon the stock, an inelastic cover fitted over the sleeve, a skin fitted over the cover,
and a space between the elastic sleeve and the stock which is loosely packed with
material and is also filled with a fluid substantially as set forth.
2. The construction of the improved inking roller substantially as herein before
described and as shown on the drawings annexed.
Dated this 17th day of February 1898.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.