Improvements in or connected with Brakes for the Cylinders of Printing Machines.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in or connected with Brakes for the Cylinders of
Printing Machines.
I, EDMUND BUSI, of Hunslet Road, 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 to construct brakes for the cylinders of printing
machines, the said brakes being actuated in a simple and powerful manner and
being held quite free when thrown out of action.
According to my invention, I fulcrum two brake levers on the framework of
the machine on opposite sides of the brake wheel, and the upper ends of the brake
levers carry suitable shoes which may be provided with a leather or other friction
surface. The lower arms of the levers are held towards each other, by means of
a spring, or their centres may be so situated that the shoes move apart away
from the brake wheel by reason of their own weight. A crosshead carrying two
rollers set out of line, is fulcrumed between the lower arms of the levers, and
the crosshead receives a rocking motion through the medium of a pending arm
attached thereto which is actuated by the reciprocating brake rod in general use.
A catch which may be actuated by the loose wheel movement, is provided for
the purpose of holding the brake or the push back lever in action, when the
cylinder is required to be held stationary during reciprocations of the table.
When the machine is at work, the reciprocations of the brake rod, cause the
crosshead to rock on its centre and to separate the lower arms of the levers by
the rollers on the crosshead being moved further apart, and as the increase in
width gained by bringing the rollers towards the horizontal line, is very small,
the leverage imparted to the brake shoes is very great, and a most efficient brake
power is thus obtained.
Improvements in or connected with Brakes for the Cylinders of
Printing Machines.
I, EDMUND BUSH, of Hunslet Road, Leeds, in the County of York, Engineer,
do hereby declare the nature of this invention and in what manner the same is
DS17

page_text: to be performed, to be particularly described and ascertained in and by the
following statement;
-
The object of this invention is to construct brakes for the cylinders of printing
machines, the said brakes being actuated in a simple and powerful manner and
being held quite free when thrown out of action.
In order that my invention may be clearly understood, I will proceed to
describe the same with reference to the accompanying drawing, in which the
brake mechanism is shewn in side elevation, the full lines shewing the brake in
the off position and the dotted lines shewing the brake applied.
'
According to my invention, I employ two brake levers A and B, which are
fulcrumed at C and D on the framework of the machine at opposite sides of the
brake wheel E; and the upper ends of the brake levers A and B carry suitable
shoes F and G, which may be provided with leather or other friction surfaces.
The lower ends of the levers A and B are held towards each other by means of
a spring H, and a crosshead J carrying two rollers K and L set out of line, is
fulcrumed at M between the lower arms of the levers A and B. The crosshead J
receive a rocking motion through the medium of a pending arm J¹ attached
thereto, which is actuated by the reciprocating brake rod N in general use.
When the machine is at work the reciprocations of the brake rod N cause
the crosshead J to rock on its centre at M and to separate the lower arms of the
levers A and B by the rollers K and L on the crosshead J being moved further
apart, thereby moving the shoes F and G situated at the upper ends of the
levers A and B up against the brake wheel E as shewn in dotted lines; and as
the increase in width gained by bringing the rollers K and L towards the hori-
zontal line is very small, the leverage imparted to the brake shoes F and G is
very great, and a most efficient brake power is thus obtained.
The weight of the levers A and B, may in some instances be sufficient to open
the brake on the release of the crosshead J, in which case the spring H could be
dispensed with.
A catch which may be actuated by the loose wheel movement, is provided for
the purpose of holding the brake or the push back lever in action, when the
cylinder is required to be held stationary during the reciprocations of the table.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The brake levers A and B, actuated by the crosshead J, substantially as
and for the purposes set forth.
2. The combination of the brake levers A and B, shoes F and G, crosshead J
carrying rollers K and L, pending arm J¹ and brake rod N, substantially as and
for the purposes set forth.
Dated this 26th
3
1 7000
BREWER & SON,
London and Leeds, Agents for the Applicant.