IMPROVE- MENTS IN PRINTING, LITHOGRAPHING, AND ZINCOGRAPHING, AND IN THE MEANS OR APPARATUS EMPLOYED THEREFOR
Year: 1869

page_text: PROVISIONAL SPECIFICATION left by Walter MacLean at the
Office of the Commissioners of Patents, with his Petition, on the
3rd December 1869.
I, WALTER MACLEAN, of Glasgow, in the County of Lanark, North
Britain, do hereby declare the nature of the said Invention of "IMPROVE-
MENTS IN PRINTING, LITHOGRAPHING, AND ZINCOGRAPHING, AND IN THE MEANS OR
APPARATUS EMPLOYED THEREFOR," to be as follows, that is to say:-
This Invention, which relates to certain arrangements of printing,
lithographing, and zincographing mechanism whereby an impression in
one or more colours is produced at one operation either upon paper or
textile fabrics in sheets, pieces, or continuous lengths, consists,-
First. In the substituting for the existing pressure cylinder of a
printing, lithographing, or zincographing machine a pressure cylinder the
circumference of which shall be equal or nearly equal to the length of

page_text: the surface to be printed, lithographed, or zincographed, in order to pro-
duce an impression in one colour in continuous lengths.
Second. In the employment of the herein before mentioned pressure
cylinder and of printing or zincographing cylinders and their respective
damping and inking apparatus in union with a flat or cylindrical printing,
lithographing, or zincographing machine having the herein-before men-
tioned kind of pressure cylinder in order to produce an impression in two
or more colours at one operation in single sheets, picces, or continuous.
lengths.
Third. In substituting for the grippers placed in front of the existing
pressure cylinder of a printing, lithographing, or zincographing machine
a set of grippers or points placed in the rim or end or other part of the
pressure cylinder so as to catch and keep hold of the fabric until it has
been printed, lithographed, or zincographed in one colour in continuous
lengths.
Fourth. In the employment of the herein-before described pressure
cylinder and of printing or zincographing cylinders and their respective
damping and inking apparatus in union with a flat or cylindrical printing,
lithographing, or zincographing machine, the pressure cylinder of which
shall have in place of the present grippers a set of grippers or points
placed on the rim or end or other part of the pressure cylinder for the
purpose of producing an impression in two or more colours at one
operation in single sheets, pieces, or continuous lengths.
When used for printing, lithographing, or zincographing continuous
lengths of paper or textile fabrics, the pressure cylinder is made with a
circumference equal or nearly equal to the length of the surface to be
printed, lithographed, or zincographed, but when used for printing,
lithographing, or zincographing short sheets or pieces of paper or textile
fabrics the circumference of the pressure cylinder has to be greater in
length than the surface to be printed, lithographed, or zincographed, and
in this case the pressure and printing cylinders are placed close together;
the pressure cylinders are also provided with grippers and the damping
and inking apparatus are modified in position accordingly. The pressure
cylinders are covered with a vulcanite tympan, or used with an endless
web, and a portion of their surface is made flat to allow the printing,
lithographing, or zincographing surface to be "double inked" for each

page_text: impression. When a continuous length of paper or textile fabric is to
be printed, lithographed, or zincographed in the manner herein-before
described it is wound up on a carrying roller, from which it is led over
stretching bars and rollers to the printing, lithographing, or zincographing
surfaces.