IMPROVEMENTS IN APPARATUS EMPLOYED IN PRINTING
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by John Ferguson Haskins at the.
Office of the Commissioners of Patents on the 17th October 1882.
JOHN FERGUSON HASKINS of 114ª Queen Victoria Street in the City of
London Engineer. "IMPROVEMENTS IN APPARATUS EMPLOYED IN PRINTING."
The object of one portion of my invention is to improve the distribution of the
ink in cylinder printing machinery in which two cylinders are employed.
For this purpose I provide around that portion of the main or type cylinder not
occupied by the form or impressing surface inking or form rollers and distributing
or vibrating rollers acting therewith such form rollers and distributing or vibrating
rollers acting to distribute the ink upon the main cylinder and from thence in turn
to the form or printing surface for printing on to the paper or other material
carried by the impression or sheet cylinder.
Another portion of my invention relates to the means for securing the printing
surfaces or plates or blocks carrying the same to the type or main cylinder.
For this purpose the main or type cylinder is recessed upon its periphery as
usual to the requisite extent for receiving the printing surface and its supporting
block or support and upon the surface of this recessed portion I secure a series of
blocks conforming to a circumferential circular line from the centre of the cylinder
on their inner and outer surfaces and having their sides or edges bevelled or wedge
shaped to form between them V grooves or recesses to receive correspondingly
shaped projections studs or clamps secured to the printing plate and these studs
serve to hold the printing surface to the blocks and thus to the main cylinder
When by a variation in the thickness of plate printing surface being employed
adjustment to the circumferential surface of the main cylinder is desired this may
be attained by substituting a series of bevelled blocks of greater or lesser thickness
in the recess of the main cylinder as required.
Another portion of my invention relates to the holding of the sheets to be printed
and the delivery of the printed sheet from the imprèssion cylinder onto the fly
or tapes.
For this purpose the sheet received from the feed board onto the impression or
sheet cylinder is held at one of its edges between one edge of a plate applied in the
grooved portion of that sheet cylinder and the grippers such grippers acting some-
what in the usual manner except that in place of the grippers coming directly
upon the cylinder they come upon this plate applied within this recess.

page_text: This plate also serves to hold one end of the cylinder packing or blanket tho
other end of which may be held by the reel as usual
This plate is on the surface thereof acting with the grippers to hold the sheet,
formed with serrations or roughened to aid its better holding and it is further cut
away in portions.in the direction of its length across the cylinder, or perforated or
otherwise formed so as thereby to permit of the flow of air under the sheet when
delivery is desired in order to assist the liberation of that sheet from the cylinder-
the air for this purpose being supplied to this plate by a tube from a channel
formed through the, axis, of the impression cylinder from a suitable source of
supply.
Another portion of the invention relates to means for preventing the impression
cylinder from taking ink from the large or main cylinder except at the part desired
for proper impression of the sheet.
For this purpose I form the plate or printing surface of a slightly increased
dinmeter than the rest of the main cylinder so that the plate portion may come in
contact with the sheet on the impression cylinder but at other portions of the
revolution of these cylinders their surfaces will not be in contact. The inking
rollers and their distributing or vibrating rollers are adjusted in their revolution
around the main cylinder over the ink distributing portion thereof already referred
to and then over the projecting printing plate by cam or such like pattern surfaces
which operate to preserve uniform contact between those parts
Or this object may be attained without reducing the diameter of any one portion
of the circumference of such innin cylinder by causing the impression cylinder at
the required portions of its revolution with the main cylinder when its sheet is not
being printed to be removed from contact for the time being with the main
cylinder by means of cam or such like guiding, surface and then brought back for
impression to the printing plate at the requisite time
Another portion of my invention relates to the ink distributing rollers which
operate with a portion of the main cylinder in effecting an even distribution of the
ink onto the printing plate.
For this purpose instead of driving the rollers operating in contact with the
main cylinder by positive gearing and surmounting them by distributers or
vibrators driven by surface contact therewith I drive the outer rollers by
positive adjustable gearing and the intermediate inking rollers working in contact
with the ink distributing portion of the main cylinder are driven only by frictional
contact with the above mentioned distributing rollers.
By these means I am enabled to obtain a better adjustment to compensate for
shrinkage of such rollers