An Improved Form or Construction of Brake to be Applied to Letter-press and Lithographic Printing Machines.
Year: 1890

page_text: Date of Application, 10th Nov., 1090
Complete Specification Left, 5th Aug., 1891-Accepted, 5th Sept., 1891
PROVISIONAL SPECIFICATION.
An Improved Form or Construction of Brake to be Applied to
Letter-press and Lithographic Printing Machines.
I, FREDERICK PAYNE, of the firm of Payne & Sons, of Atlas Works, Otley, in
the County of York, Printing Machine Makers, do hereby declare the nature of
this invention to be as follows: -
In letter-press and lithographic printing machinery, the rotary motion of the
impression cylinder is stopped by a brake after each impression has been made, but
in consequence of the increased speed at which these machines are now worked, and
the weight of the cylinder in large machines, it is found that the present form of
brake is not sufficiently powerful to immediately stop the motion of such impression
cylinder. The object of my invention is to provide for the above mentioned
machines, an improved arrangement and form of brake, consisting of a steel strap,
passing over the full periphery of the brake wheel on the end of the impression
cylinder shaft. One end of the steel strap is secured to a lever arm suspended on
the axle of the said cylinder, the lower end of the said lever arm being suitably
slotted and placed onto a fixed stud, projecting from the framework. The other
end of the steel strap is connected to a short lever, working on a stud projecting
from the lever arm, which lever (after cach impression) is operated by a cam, so as
to tighten the strap against the periphery of the said brake wheel on end of
cylinder shaft, which is immediately stopped, but in addition to the cylinder being
thus stopped, the hanging lever arm is forced or drawn upwards vertically, the
peculiar shape of the slot at the bottom thereof permitting this to be done, the
effect of which is, that the impression cylinder is held up to the bearing instead of
being pulled down as in other brakes; but as soon as the cam ceases to act on the
lever, the brake is removed and the cylinder pushed back into position ready for the
next impression.
In lithographic machines, the slot at the bottom of the lever arm is so shaped as
to cause the impression cylinder to be held down instead of being held up, as in a
etter press machine.
Dated this 8th day of November 1890.
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
An Improved Form or Construction of Brake to be Applied to
Letter-press and Lithographic Printing Machines.
I FREDERICK PAYNE, of the firm of Payne & Sons, of Atlas Works, Otley, in
the County of York, Printing Machine Makers, do hereby declare the nature of
this invention and in what manner the same is to be perforined, to be particularly
described and ascertained in and by the following statement :-
In letterpress and lithographic printing machinery, the rotary motion of the
impression cylinder is stopped by a brake after each impression has been made, but
in consequence of the increased speed at which these machines are now worked, and
the weight of the cylinder in large machines, it is found that the present form of
brake is not sufficiently powerful to immediately stop the motion of such impression
cylinder. The object of my invention is to provide for the above-mentioned
machines an improved arrangement and form of brake, consisting of a steel strap,
[Price 6d1

page_text: passing over the full periphery of the brake wheel on the end of the impression
cylinder shaft.
One end of the steel strap is secured to a lever arm suspended on the axle of the
said cylinder, the lower end of the said lever arm being suitably slotted and placed
onto a fixed stud projecting from the framework. The other end of the steel strap
is connected to a short lever, working on a stud projecting from the lever arm,
which lever (after each impression) is operated by a cam, so as to tighten the strap
against the periphery of the said brake wheel on end of cylinder shaft, which is
immediately stopped.
Such being the nature and object of my said invention, I will now proceed to
describe the same with reference to the annexed sheet of drawings, which is side
elevation of such parts of a letter-press printing machine as is necessary to illustrate
the application thereto of my improvements. A represents the framework of the
machine, and B the brake wheel fixed on the end of the impression cylinder. Hanging
loosely on the shaft of the impression cylinder is a lever arm C, made at its lower
end with a slot fitting onto a stud D projecting from the frame of the machine. The
lever arm C carries a short lever E working on a stud or fulcrum F. One end of a
steel strap G is fixed to a lug, shewn in dotted lines, projecting from the inner side
of the lever arm C, whilst the other end of the said steel strap is connected to a
link H, working on a pin at the upper end of the short lever E, the opposite end of
such said short lever being attached to the long rod I, supported by the upper end of
lever J, operated at a given time by the cam K so as to tighten the steel strap G
around the periphery of the brake wheel B for the purpose of stopping the rotary
motion of the impression cylinder, but in addition to the said cylinder being made
to stop, the hanging lever arm C is forced or drawn upwards, the slot. at the bottom
thereof permitting this to be done, the effect of which is that the impression cylinder
is held up to its bearings, but as soon as the cam K ceases to act on the lever J,
the brake is removed and the impression cylinder returns to its normal position
again ready for the next impression. To prevent the long rod I being too rigid,
I place thereon a spiral spring L between the end of lever J and adjustable
locknuts M.
In lithographic machines, the slot at the bottom of the lever arm C is so
shaped as to cause the impression cylinder to be held down, instead of being forced
up, as in the case of a letter-press machine.
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
In letter-press and lithographic printing machinery, the combination therewith
of a steel brake strap, connected to a slotted lever such as C, and to a link and
lever such as E, operated in the manner substantially as herein shewn and described.
Dated this 4th day of August 1891.
TASKER & CROSSLEY,
Halifax, Agents.