IMPROVEMENTS IN PRINTING FROM ENGRAVED BLOCKS AND ELECTROTYPES IN CYLINDER PRINTING MACHINES
Year: 1876

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS IN
PRINTING FROM ENGRAVED BLOCKS AND ELECTROTYPES IN CYLINDER
PRINTING MACHINES." A communication from abroad by Auguste Hippolyte
Marinoni, of Paris, France.
Sealed the 28th November 1876, and dated the 16th June 1876
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 16th June 1876.
ALEXANDER MELVILLE Clark, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent.
"IMPROVEMENTS IN PRINTING FROM ENGRAVED BLOCKS AND
ELECTROTYPES IN CYLINDER PRINTING MACHINES."
This Invention relates to printing direct from clectrotypes or engraved blocks in
cylinder printing machines.
Hitherto the printing of engravings for illustrated newspapers and other pub-
lications has been effected in what are termed flat machines, at the rate of from one
to two thousand copies per hour, cylinder machines working at a high speed not
being so suitable for the purpose, as the stereotypes obtained from paper moulds
used in those machines fail to produce impressions as fine as those obtained direct
from electrotypes or engraved blocks.
By the application of this Invention to cylinder printing machines I am enabled
to print illustrations at the rate of from 15 to 20,000 copies per hour.
This Invention may be carried into effect in various ways. For example, I may
produce cylindrical stereotypes in the ordinary manner, and afterwards hollow out
a space therein of the necessary size and depth to receive the electrotype or en-
graved block, which is secured therein by any suitable means; or a space of the
proper dimensions and of a depth equal to the electro or engraved block may be
reserved in the cylindrical stereotype. This is effected by inserting core pieces
either in the matrix or mould for the stereotype, a space being thus reserved of the
exact depth required, and which may be equal to the thickness of the stereotype
itself. In this case the electro or engraved block would rest upon the surface of
the type cylinder, and might either be fixed thereto or to the stereotype.
It will be understood that the electros or engraved metal blocks are previously
curved to the shape of the cylinder on which they are applied and fixed in the
manner described.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Alexander Melville Clark in the Great Seal Patent Office on the 15th
December 1876.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent.
"IMPROVEMENTS IN PRINTING FROM ENGRAVED BLOCKS AND
ELECTROTYPES IN CYLINDER PRINTING MACHINES. A communication from abroad
by Auguste Hippolyte Marinoni, of Paris, France.
This Invention relates to printing direct from electrotypes or engraved metal
plates or blocks in combination with the stereotypes in rotary printing machines.
Hitherto the printing of engravings for illustrated newspapers and other pub-
lications has been effected in what are termned flat form machines working at the
rate of from one to two thousand copies per hour, it not having been possible
hitherto to employ rotary machines working at a high speed for the purpose, as
stereotypes obtained from paper moulds as used in those machines would fail to
produce impressions as fine as those obtained direct from electrotypes or engraved
blocks.
By the application of this Invention to rotary printing machines I am enabled to
print illustrations at the rate of from 15,000 to 20,000 copies per hour.
This Invention may be carried into effect in various ways. For example, I may
take cylindrical stereotypes produced in the ordinary manner and hollow out a
space therein of the necessary size and depth to receive the electrotype or engravod
block, which is secured therein by any suitable means; or a space of the proper
dimensions and of a depth equal to the electro or engraved block may be reserved
in the cylindrical stereotype. This is effected by inserting core pieces either in the
inatrix or mould for the stereotype, a space being thus reserved of the exact depth
required and which may be equal to the thickness of the stereotype itself In this
case the electro or engraved block would rest upon the surface of the type cylinder,
and might either be fixed thereto or to the stereotype.
It will be understood that the electros or engraved metal blocks are previously
curved to the shape of the cylinder on which they are applied and fixed in the
manner described.
Having described the nature of the said Invention, and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein-before in part recited Letters Patent is the application and employment in
rotary printing machines of electrotypes or engraved blocks or plates in combination
with the stereotypes for printing direct therefrom, as described.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set my
hand and seal, this Fifteenth day of December, in the year of our Lord
One thousand eight hundred and seventy-six.
A. M. CLARK. (L.S.)