Press Printing Machines.
Year: 1887

page_text: Date of Application, 21st July, 1887
Complete Left, 9th Apr., 1888
Complete Accepted, 11th May, 1888
Press Printing Machines.
I, GEORGE BRAYSHAW, Engineer, 126 Beeston Road, Leeds, in the County of
York, do hereby declare the nature of this invention to be as follows:-
This invention relates to brake apparatus for the cylinders of lithographic and
letterpress printing machines which require the brakes to be applied at certain parts
of each revolution of their cylinders.
On the axis of the impression cylinder I fix a cam against which bears a roller
mounted on the middle joint of a pair of toggle arms.
The ends of these toggle arms
are jointed to levers mounted one on each side of the cylinder or of a brake wheel on
its axis. These levers have attached to them brake blocks or shoes which are
adjusted to be nearly in contact with the cylinder or with the brake wheel on its axis,
but are usually held out of contact by a weight or spring acting on the toggle arms.
The cam is so shaped that, at certain parts of the revolution of the cylinder, it acts on
the toggle arms in such a manner that the two levers are drawn towards the cylinder
pressing the brakes against it or the brake wheel, one on each side thereof; by the
further rotation of the cam the toggle arms are released and the brakes are taken off
by the weight or spring.
Dated this 21st day of July, 1987
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Brake Apparatus for the Cylinders of Lithographic and Letter
Press Printing Machines.
I, GEORGE BRAYSHAW, Engineer, 126 Beeston Road, Leeds, in the County of York,
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 brake apparatus for the cylinders of lithographic and letter
press. printing machines which require the brakes to be applied at certain parts
of each revolution of their cylinders as I will describe referring to the accompanying
drawings.
Fig. 1 is a front elevation, and Fig. 2 an end elevation of brake apparatus according
to my invention, and Fig. 3 is a plan of the slide.
On the axis 1 of the impression cylinder I fix a cam 2 against which bears a roller 4
mounted on the middle joint of a pair of toggle arms 5. The ends of these toggle
arms are jointed to levers 6 mounted one on each side of the cylinder or of a
brake wheel 7 on its axis. These levers 6 are so shaped or have attached to them
brake blocks or shoes so adjusted as to be nearly in contact with the cylinder or
with the brake wheel 7, but are usually held out of contact by a weight or
spring 8 acting on the toggle arms by driving down a slide 3 jointed to the
levers 6.
The cam 2 is so shaped that at certain parts of the revolution of the cylinder it
acts on the toggle arms 5 in such a manner that the two levers 6 are drawn
towards the cylinder pressing the brakes against it or the brake wheel 7, one on
each side thereof; by the farther rotation of the cam 2 the toggle arms 5 are
released and the brakes 6 are taken off the wheel 7 by the action of the weight or
spring 8.
By means of setting and lock nuts the strain of the spring 8 and the position of
the brakes can be adjusted.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
As brake apparatus for the cylinders of a printing machine the combination of the
cam 2, the toggles 5, the brake levers 6, the slide 3, and spring 8 or an equivalent
weight, substantially as described.