Improvements in Brakes for Cylinder Printing Machine s.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Brakes for Cylinder Printing Machine s.
I, DANIEL THOMAS POWELL, of 33A, Ludgate Hill, in the City of London,
Printer's Engineer, do hereby declare the nature of this invention to be as
follows:-
On the cylinder shaft and between the bearing and brake-wheel I interpose a
casting or forging having a slotted hole in it to correspond with the diameter
of the shaft. At one end is a flange the segment of a circle corresponding to the
circumference of the brake-wheel & this is lined with leather, wood, or other
suitable substance. The other end of the casting is provided with a stud &
friction roller and also a set screw with or without a spring for adjusting the
position of the friction wheel. At the back of the brake-wheel and either
attached to the cylinder shaft, or to the brake wheel or cast on the brake-wheel
is a camb of suitable shape to engage the friction roller and draw the brake tightly
on to the periphery of the brake-wheel.
At any suitable point I provide a stop or guide to prevent the casting revolving
on the cylinder shaft.
This system may be applied in two seperate segments worked with one or two
actions self contained as described or a similar effect may be produced by working
levers or cranks by cambs from the one revolution shaft of any ordinary printing
machine.
Doted this 13th day of Tonno 1800
I, DANIEL THOMAS POWELL, of 33A, Ludgate Hill, in the City of London,
Printer's 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:-
This invention relates to improvements in brakes for cylinder printing machines,
and has for its object the simplification of the method of checking the speed of
the cylinder, as it completes its revolution, causing it to stop without jar. In
order that my invention may be better understood I have annexed hereto draw-
ings having index letters to point out the various parts. On the cylinder shaft A
and preferably between the cylinder bearing and the brake wheel B which is
fixed on the cylinder shaft; I interpose a casting or forging D having a slotted
[Price 8d 1

page_text: hole in it C to correspond with the diameter of the cylinder shaft. At one end
is a flange which is a segment of a circle corresponding to the circumference
of the brake wheel, and this is lined with leather, wood or other suitable substance
as shown at E. At the other end of the casting or forging I place a stud F
which is fastened by a nut and washer in a slotted hole G or the stud may be
eccentric in which case no slotted hole is required, and on the stud I place a
friction roller H a spring may be placed behind this stud and in such a case
the stud would not be screwed tightly in the slotted hole. Acting on the stud,
with or without the spring, I place a set screw K with lock-nut L in order that
close adjustments may be made.
Behind the brake wheel and between the casting or forging I place a camb I
of suitable shape and this camb engages with the friction roller and draws the
brake gradually on to the brake wheel. This camb may be separate from the
brake wheel and attached to the cylinder shaft, or brakewheel, or it may be
formed as a part of the brake wheel. It should be so set that when the cylinder is
stopped in its appointed place, its highest projection should almost have passed
the centre line of the friction roller. The object of this is to ensure the release
of the brake the moment the cylinder is started again. It is necessary to
introduce a stop or guide J to prevent the casting revolving with the cylinder
shaft and the position of this stop must be determined by the style and make of
the printing machine to which this brake is applied. The position shown in
the drawing, is as I use it on my printing machines known in the trade as
the Little Wonder.
The casting or forging may be placed on the other side of brake wheel in
which case a collar or washer would be needed to keep it in its place.
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:-
As brake apparatus for cylinders of printing machines a combination of the
casting D, with its lined flange D' stop J and slotted holes CG, the adjustable
stud the friction roller H, the camb I set screw K and lock nut L substantially
as described.
TY
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