IMPROVEMENTS IN DAMPING ROLLERS AND OTHER APPARATUS FOR LITHOGRAPHIC PRINTING PRESSES
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by William Henry Woodcock at the
Office of the Commissioners of Patents, with his Petition, on the
14th April 1875.
I, WILLIAM HENRY WOODCOCK, of Brooklyn, New York, United
States of America, now of No 8, Southampton Buildings, London, do
hereby declare the nature of the said Invention for " IMPROVEMENTS IN
DAMPING ROLLERS AND OTHER APPARATUS FOR LITHOGRAPHIC PRINTING PRESSES,"
to be as follows
-1
These improvements are designed for lithographic printing presses,
wherein the impression cylinders receive rotary motion, and the beds on
which the " form or the "stone" is supported, receive a rectilinear
reciprocating motion beneath the said beds.
"
My Invention relates to a hollow damping roller or "rider" adapted
to revolve around its axis, and suitably perforated in combination
with perforated pipes arranged inside of the said rollers, and supplied
with water in regulated quantities by means of feed pipes as herein-
after explamed.

page_text: It also relates to the combination of "wipers" with the internal per-
forated pipes for the purpose of evenly distributing the water on the
interior surface of the said perforated cylinder.
It also relates to novel means whereby a fly cylinder can be adjusted
or removed from the impression cylinder and the delivery table, thereby
enabling the operator to fly the sheets either by hand or by the fly
cylinder. For this purpose I apply the fly cylinder in a frame which is
jointed to the main frame of the press, and capable of being thrown up
and also readily removed so as to allow access to the impression
cylinder.
My improved damping roller is a perforated cylinder rotated. by any
suitable contrivance, and containing a number of perforated pipes
extending from one end to the other of the roller, and closed at their
ends. Each one of these pipes is supplied with water by means of a
feed pipe, which is provided with a cock or valve for regulating the 1
supply of water These pipes are stationary, and the said perforated
cylinder revolves around them I introduce the water into the first
named pipes at or about their centre, or midway between their two ends,
so that it will flow equally in two directions, that is to say, towards both
ends of the cylinder. Outside of cach of these pipes 1 apply a
wiper,"
which may be made of leather or other suitable material, and which
is arranged to act on the inner side of the perforated cylinder, and
thereby so distribute the water that it will flow uniformly through all
of the perforations in the cylinder By means of this damping roller
I am able to uniformly damp the surfaces of the rollers, which apply
the moisture to the stone as it reciprocates beneath them.
Ι
"E
The press frame impression cylinder and feed board may be con-
structed in the usual manner.
Inking rolls are arranged to run together in pairs; these rolls vary
in diameter, and in practice will have "riders" applied to them, włuch
receive endwise motion. These "riders" uniformly distribute the ink to
the rollers, and the latter varying in size uniformly supply the ink to
the stone or type without leaving cross lines thereon.
The fly cylinder has its end bearings in a frame arranged to vibrate
vertically about transverse bolts, which passes through arms of the said

page_text: detached from the press. This detachment of the said fly cylinder will
be required when it is desired to take off the sheets by hand.
While "making ready" it is not necessary to remove the fly cylinder,
but simply to raise it out of the way of the impression cylinder.
The said fly cylinder is arranged on one side of a vertical plane,
intersecting the axis of the impression cylinder, and on that side whereon
the feed board is arranged. By this arrangement of the fly cylinder a
press can be constructed for printing the largest sized sheets without
necessarily increasing the diameter of the impression cylinder, at the
same time the impression can be completed before the grippers of the
fly cylinder take hold of the sheets. This contrivance will prevent
the "blurring" or stripping of large sheets on the form.