Improvements in Fastening Devices for Securing Printing Plates to Supporting Cylinders in Printing Presses.
Year: 1899

page_text: Date of Application, 23rd May, 1899-Accepted, 8th July, 1899
COMPLETE SPECIFICATION.
Improvements in Fastening Devices for Securing Printing Plates to
Supporting Cylinders in Printing Presses.
1, EUGENE SEMPLE BRADFORD, a citizen of the United States, residing on 77th
Street, near Fifth Avenue, in the City of Brooklyn, in the County of Kings and
State of New York, Mechanical 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:-
My invention has relation to printing presses and particularly in such connection
does it relate to means or fastening devices for securing a printing plate to a
supporting cylinder in a printing press.
The principal object of my present invention is to provide simple and effective
means or fastening devices for securing a printing plate to the supporting cylinder
of a printing press.
My invention consists of the improvements in a printing press when constructed
and arranged in substantially the manner hereinafter described and claimed.
The nature and characteristic features of my present invention will be more
fully understood from the following description taken in connection with the
accompanying drawings forming part hereof, in which
Figure 1, is a sectional view of a portion of a printing press illustrating the
plate and impression cylinders thereof in side elevation, and the said view embody-
ing also the particular features of my present invention.
Fig. 2, is a top or plan view of the plate cylinder.
Fig. 3, is a transverse sectional view enlarged through the upper portion of the
plate cylinder.
Fig. 4, is a side elevational view partly sectioned of Fig. 3.
Fig. 5, is a transverse sectional view through the plate cylinder showing a
modified form of means or devices for fastening or clamping the printing plate
to its cylinder.
Fig. 6, is a top or plan view of Fig. 5 partly sectioned.
Fig. 7, is a side elevational view of Fig. 6, showing one of the clamps of the
said fastening means in inoperative position.
Figs. 8 and 9, are detail views of the clamps for holding the plate to its sup-
porting cylinder, as shown in Figs. 1 to 7; and
Fig. 10, is a side elevational view of the clamp of Figs. 5, 6 and 7 adapted to
permit of the insertion, actuation and removal of the spindles or screw-bolts
controlling the plate clamps of Figs. 5 to 7.
Referring to the drawings, in the press of my said invention, A is the impression
cylinder and B, is the plate cylinder, both suitably journaled in bearings in the
framework C, of the press. The bearings b, of the impression cylinder are prefer-
ably supported in vertical guides b¹, and a spring 62, and a set-screw b³, are pro-
vided, whereby the position and pressure of the impression cylinder are readily
and efficiently adjusted. The printing plate D, is preferably fastened to its sup-
porting cylinder B, by means of a clamping device E. In Figs. 2 to 4 inclusive.
the clamping device consists of jaws or dogs e, arranged to slide in longitudinal
guide-ways or slots e, in the periphery of the cylinder B. Screw-bolts or spindles e²,

page_text: work in these jaws or dogs and are held at their inner ends by plates e, engaging
heads e, on said bolts or spindles, so that as the bolts or spindles are turned
one way or the other the jaws or dogs e, are brought tightly against or released
from the edges of the printing plate D, which is clamped between them. The
plates, have, slots through which pass the fastening bolts e so that by
loosening these. bolts and moving the plates downwardly, the screw-rods or bolts e2,
together with the jaws or dogs e, carried thereon may be readily and quickly with-
drawn, as "will be clearly understood from Fig. 3, of the drawings. In the
construction. illustrated in Figs. 5 to 7 inclusive, the bolts e², are provided with
two .collars and 8. Located at or near one end of the cylinder B, one of these
collars e, is placed within the cylinder B, while the other is located beyond the
end of the cylinder. e¹0, is an S-shaped clamp located between the two collars e
andes, and removably secured by means of shoulder screws e, to the face of the
evlinder B, as illustrated in Fig. 7, of the drawings. By the turning of the
S-shape clamp e10, the same is brought into or out of engagement with the shoulder
screws e. By disengaging the clamp el, from the shoulder screws e, the spindle
or screw-bolt e³, with the clamp e, can be readily withdrawn from the opening e¹,
of the cylinder B¹. By a reverse movement of the clamp e¹0, the bolt or spindle e,
can be made to be readily secured to the cylinder B, by the engagement of the
clamp with the shouldered screws e³. It will be observed that the construction
and arrangement of the clamps are such as to be readily or quickly brought into
operative condition, secured and withdrawn from the plate cylinder B. In the
construction shown in Figs. 1 to 4, the openings e, provided near the periphery
of the plate cylinder B, are separated by a partition 9, provided with recesses g¹
and g, for the reception of the heads e, of the spindles or screw bolts e². In the
construction shown in Figs. 5 to 7. the openings e, extend entirely through the
cylinder. The means for holding the screw-bolts or spindles e³, in position are
in this instance located at the free ends of the cylinder B, and outside thereof,
whereas in the construction shown in Figs. 1 to 4 inclusive the means for holding
the spindles or screw-bolts e², are placed near the middle of said cylinder B.
Having now particularly described and ascertained the nature and object of my
invention and in what manner the same is to be performed, I declare that what
I claim is:-
-
1. In a machine of the character described, a plate cylinder having longitudinal
openings or grooves therein, a plate holder consisting of dogs mounted on spindles
or screw-bolts and movable in the grooves or openings of said cylinder, and clamps
adapted to swing on said spindles or screw-bolts and with said dogs to be clamped
to said cylinder, substantially as and for the purposes described..
2. In a machine of the character described, a plate cylinder, means for clamping
a plate to said cylinder consisting of dogs slidable in grooves or openings of said
cylinder, spindles or screw-bolts traversing said dogs, and S-shape clamps adapted
to swing on said spindles or screw-bolts, substantially as and for the purposes
described.
3. In a machine of the character described, a plate cylinder, dogs adapted to be
brought into and out of engagement with the plate of said cylinder, spindles or
screw bolts operating said dogs, and S-shape clamps adapted to be swung into
and out of engagement with the bolts of said plate cylinder, substantially as and
for the purposes described.
Dated
DI1111
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