IMPROVEMENTS IN APPARATUS EMPLOYED IN PRINTING
Year: 1882

page_text: LETTERS PATENT to John Ferguson Haskins of 114A Queen Victoria Street
in the City of London Engineer for an invention of IMPROVEMENTS IN
APPARATUS EMPLOYED IN PRINTING
(Void by reason of the Patentee having neglected to file a Specification in
pursuance of the conditions of the Letters Patent.)
PROVISIONAL SPECIFICATION left by the said John Ferguson Haskins
at the Office of the Commissioners of Patents on the 18th April 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 dis-
tributing 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 corre-
spondingly 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
Price D1

page_text: 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 ba
printed and the delivery of the printed sheet from the impression 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
somewhat in the usual manner except that in place of the grippers coining directly
upon the cylinder they come upon this plate applied within this recess.
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 sheat,
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
diameter than the rest of the main cylinder so that the plate portion may como
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 oue portion
of the circumference of such main 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 offecting 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 positivo 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 euabled to obtain a better adjustment to compensate for
shrinkage of such rollers.