An Improved Means or Method of Braking the Cylinders of Letter Press and Lithographic Printing Machines.
Year: 1893

page_text: Date of Application, 25th May, 1893
Complete Specification Left, 26th June, 1893-Accepted, 29th July, 1893
PROVISIONAL SPECIFICATION.
An Improved Means or Method of Braking the Cylinders of Letter
Press and Lithographic Printing Machines.
I, JOHN HORNER PAYNE, of the Firm of David Payne & Co., of Caxton
Works, Otley, in the County of York, Printers' Engineers, do hereby declare the
nature of this invention to be as follows:-
My invention has reference to the means or method of braking the cylinders of
printing machinery, the object of my improvements being to apply the brake both
above and under the cylinder so that there is no undue pressure of the axis of the
cylinder in its bearings.
According to my invention I employ a brake pulley near the end of the cylinder
around which pulley is a steel strap having a packing of leather or other suitable
material. One end of the steel strap is attached to a finger placed loosely on a
stud projecting from the framework of the machine, whilst the opposite end of the
said strap is connected to another finger placed loosely upon a stud attached to the
brake arranged on the underside of the brake pulley. This brake is slotted and
works upon a stud also projecting from the framework.
By means of a cam the brake is always applied after each impression made by
the cylinder.
By employing a brake on the under and upper periphery of the brake pulley, the
said pulley is borne between the two brakes in such a way as to cause no undue
pressure on the axis of the cylinder.
Dated this 24th day of May 1893.
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
An Improved Means or Method of Braking the Cylinders of Letter
Press and Lithographic Printing Machines.
I, JOHN HORNER PAYNE, of the Firm of David Payne & Co., of Caxton
Works, Otley, in the County of York, Printers' Engineers, 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 :-
My invention has reference to the means or method of braking the cylinders of
printing machinery, the object of my improvements being to apply the brake both
above and under the impression cylinder so that there is no undue pressure on the
axis of the cylinder in its bearings. According to my invention I employ a brake
pulley near the end of the impression cylinder, around which pulley is a steel strap
having on its underside a packing of leather or other suitable material.
One end of
the steel strap is attached to a finger placed loosely on a stud projecting from the
framework of the machine, whilst the opposite end of the said strap is connected to
another finger placed loosely upon a stud attached to the brake arranged on the
underside of the brake pulley. This brake is slotted and works upon a stud also
projecting from the framework.
By means of a cam the brake is always applied after each impression made by
the cylinder.
In order that my invention may be better understood, reference is made to the
accompanying sheet of drawings which is side elevation of a letterpress printing
machine.

page_text: A is the framework of the machine and B the brake pulley secured on the
shaft C which carries the impression cylinder. A metal strap G suitably packed
on the underside is passed partially around the upper surface of the brake pulley,
one end of the said strap being connected to a lug E mounted loosely on a stud F
projecting from the frame of the machine, whilst the opposite end of the said
strap G is connected to another lug H mounted on a stud L projecting from the
brake lever N, the latter of which is supported on a stud D. A rod I is connected
to the lower arm of the brake lever N, the opposite end of such said rod being
connected by adjustable lock nuts M to a short lever J pivotted at O. On the
lower arm of the lever O is a bowl or pulley P placed in contact with a revolving
cam K, which cam at one portion of its revolution (acting on pulley P) forces_the
rod I in the direction of the arrow, the effect of which is to cause the brake N to
bind on the underside of the brake pulley B and simultaneously therewith the
brake lever N draws the strap G downwards in the direction of the arrow, whereby
the said strap binds upon the upper side of the brake pulley, consequently the two
opposing forces of the brake N and strap G keeps the axis C in a state of equilibrium
and prevents it bearing with undue pressure in the brasses in which it revolves.
By this means the said brake pulley is borne equally between the upper and lower
brakes so that wearing away of the shaft end or the brasses is reduced to a
minimum, thus the accurate working of the impression cylinder is longer maintained.
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 letterpress and lithographic printing machinery, the use therein of the brake
strap G in combination with the brake lever N applied simultaneously in the
manner described for imparting equal pressure on the upper and lower peripheries
of the brake pulley.
Dated this 91at daw of Tune 1902
TASKER & CROSSLEY,
Halifax, Agents.