Improvements in the Brake Mechanism of Litho and Letterpress Machines and the like.
Year: 1896

page_text: Date of Application, 19th June, 1896
Complete Specification Left, 19th Mar., 1897-Accepted, 1st May, 1897
OVISIONAL
Improvements in the Brake Mechanism of Litho and Letterpress
Machines and the like.
I, GEORGE NEWSUм, of 5, Fairfax Road, Beeston Hill, Leeds, in the County
of York, Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is an improved method and application of the
brake to litho and letterpress machines as given in my Patent No. 2416 of 1886,
so as to bring the working of the cylinder in conjunction with the table under
more perfect control, the action of the brake being entirely controlled by the
movement of the machine, without the aid of springs to raise the brake clear of
the wheel.
I accomplish my object in the following manner. Connected with the brake
wheel and at the centre of it is a cam which actuates the brake lever, by means of
a roller which is maintained in contact with it by a roller path cast on the surface
of the wheel.
The brake strap is connected to the brake lever in such a way, by removing the
fixed end further away from the fulcrum of the lever, greater clearance is obtained
from contact with the wheel, when the brake is not in operation.
The strength of the brake is controlled by a loaded spring, by means of which,
the load on the brake may be adjusted as required.
Dated this 18th day of June 1896.
JOHN WAUGH,
Agent.
COMPLETE SPECIFICATION.
Improvements in the Brake Mechanism of Litho and Letterpress
Machines and the like.
I, GEORGE NEWSUм, of 5 Fairfax Road, Beeston Hill, Leeds, in the County
of York, Engineer, 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 :-
The object of this invention is an improvement in the method of arrangement
and application of the brake straps to litho and letterpress machines in contra-
distinction to that described in my Patent Specification No. 2416 of 1886, so as
to bring the working of the cylinder in conjunction with the tables under more
perfect control, by so constructing the brake mechanism that, the action of the
brake strap on the brake pulley is entirely controlled by the machine, without the
aid of a strong spiral spring to raise the brake strap clear of the brake wheel or
pulley when the lever is liberated by the cam.

page_text: In describing my invention in detail, reference is made to the accompanying
sheet of drawings in which
Fig. 1 represents my improved brake arrangement as applied to the shaft of
an impression cylinder, and
Fig. 2 is a plan of the same.
The brake wheel or pulley A. is secured to the cylinder shaft B. in the ordinary
manner, and to the face of the said wheel or pulley is formed a cam roller path C.
between the flange D. and centre cam E. in which is a roller F. mounted to the
lever G. supported at one end by a fulcrum pin H.
The fixed end of the brake strap J. is connected to the said lever by a pin at K.
passing through the lever and arm G¹ some distance from the fulcrum pin H, and
at the other end of the brake strap J. is secured a bar L. which passes through a
hole in the lever G. and terminates with a screwed end; a spring S. is placed on
the bar L. and compressed between the lever and nuts N.
By securing the fixed end of the brake strap J. to the lever G. away from the
fulcrum pin H. towards the pulley A, the brake strap is brought sooner into
contact with the pulley A, on the depression of the lever G, and on the release of
the said lever, a quicker and better clearance between the strap and pulley-is
obtained than is the case when the strap is mounted and operated in the manner as
described in the before mentioned specification.
The strength or amount of pressure of the strap J. upon the circumference of
the pulley A. is controlled by the compressed spring S. on the depression of the
lever G. by the projections on the centre cam E. acting on the roller F.
A light
spiral spring S placed between the lever G. and expanded end of the brake.
strap J. may be utilized for keeping the strap clear of the pulley when it is not
required to be held down by the cam for stopping the rotation of the impression
cylinder.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,
A brake lever G. operated by a cam combined with a strap J. secured at one
end to the said lever some distance from the fulcrum pin H, the whole being
operated and arranged substantially in the manner and for the purpose as herein-
before set forth.
Dated this 18th day of March 1897
JOHN WAUGH,
Agent.