IM- PROVEMENTS IN PRINTING PRESSES OR MACHINES
Year: 1878

page_text: :
LETTERS PATENT to Theodore Dupuy, of the Firm of Th. Dupuy et Fils, of
Rue des Petites Hôtels, No. 22, at Paris, Printers, for the Invention of "IM-
PROVEMENTS IN PRINTING PRESSES OR MACHINES."
Scaled: the 24th January 1879, and dated the 29th July 1878.
PROVISIONAL SPECIFICATION left by the said Theodore Dupuy at the Office
of the Commissioners of Patents on the 29th July 1878.
<<
THEODORE DUPUY, of the Firm Th. Dupuy et Fils, of Rue des Petits Hotels,
No. 22, at Paris, Printers. IMPROVEMENTS IN PRINTING PRESSES OR MACHINES."
The improvements which form the subject of this Invention relate to perfecting
printing machines of the kind in which there are two cylinders mounted side by
side, working alternately, the one descending and rotating to make an impression
whilst the other ascends and rests.
For effecting the alternate ascent and descent of the cylinders their axes are
mounted in bearings fitted in vertical guides and suspended from opposite arms of
a T shaped lever, the vertical arm of which is caused to reciprocate by the action of
an eccentric worked from the same gearing as that which gives motion to the
cylinders. The eccentric is caused at each alternation to make half a revolution
and then rest, so raising one of the cylinders and depressing the other.
In order to keep the cylinder gear constantly engaged, notwithstanding its alter-
nate ascent and descent, the axis of an intermediate gearing wheel is moved
laterally by the T lever, so that the teeth at the gearing remain engaged with
one another although the cylinder and its toothed wheel change their position.
For working the grippers and also the feeding table, and discharging rolls, and
tapes, from the movement of each cylinder, a disc is mounted loosely on the cylinder
shaft near its one end, this disc having mounted in it, on radiating axes, two or
nore bevil pinions. These pinions gear with bevil teeth on the end of the
cylinder, and also with bevil teeth on a fixed disc, so that as the cylinder

page_text: revolves the loose disc is caused to revolve at half the speed, in the manner of sun-
and-planet gearing. The disc so moved gives motion in the usual way to the
grippers, and to the feed and discharging mechanism.
For turning the ink cylinders at each end of the machine, a worm on a counter-
shaft at the middle works two worm pinions, from which inclined shafts extend to
bevil gear at each end of the machine, working the two inking cylinders.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Theodore Dupuy in the Great Seal Patent Office on the 27th January
1879.
THEODORE DUPUY, of the Firm of Th. Dupuy et Fils, of Rue des Petites Hôtels,
22, at Paris, Printers. IMPROVEMENTS IN PRINTING PRESSES OR MACHINES."
"
My said Invention has for its object improvements in perfecting printing
machines of the description in which two cylinders are employed, mounted side by
Bide and working alternately, the one descending and rotating to make an impres-
sion whilst the other ascends and rests; and it consists in the peculiar construction
and arrangement of certain parts of the mechanism, videlicit :-
First. The mechanism for raising the cylinders and of the toothed gearing acting
as intermediary between the toothed wheel on the axis of one of the cylinders and
the pinion on the driving shaft, whereby each of the two cylinders is caused to
move in a uniform and regular manner.
Second. The mechanism for working the grippers.
Third. The mechanism for working the end of the feeding table and for
delivering the sheets.
Fourth. The mechanism for working the inking rollers.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same, and for that purpose shall refer to
the several Figures on the annexed Sheet of Drawings, the same letters of reference
indicating corresponding parts in all the Figures.
Figure 1 Sheet 1 of the accompanying Drawings represents a side elevation of
the improved printing machine, and Figure 2 is a detail plan of one of the parts.
Figure 3 (Sheet 2) is a longitudinal section of the machine.
Figure 4 (Sheet 3) is a transverse section of one half of the machine, the section
being taken through the axis of one of the cylinders; and Figure 5 is a transverse
section taken between the two cylinders.
This machine is provided with two printing cylinders A, B, carried on axes O,
working in bearings suspended by screwed rods a; these rods depend from the
extremities of the horizontal arms of two T levers C oscillating on axes O¹. The
alternate ascending and descending motions of the cylinders A, B, are effected in a
regular and uniform manner by means of these levers, which receive their oscil-
lating motion through the intervention of their other or vertical pendent arms C³, the

page_text: two pendent arms C₁ of the respective levers being connected at their lower
extremities by a shaft o carrying excentrics b, the straps of which are connected by
means of jointed rods o' to fixed points on the side frames ✗ of the machine. The
shaft o carries a toothed wheel D, and another toothed wheel D¹, of the same
diameter, is keyed upon a sleeve E (Figures 1 and 5) carried upon the driving
shaft M.
The mechanical movement employed in this arrangement is well known, and in
itself forms no part of my present Invention, any detail description of the same will
therefore be unnecessary.
This special mechanism, however, (as will herein-after appear) is particularly
adapted to give the required motion to the cylinders.
The sleeve E is caused to make half a revolution at the end of each stroke of a
rack F attached to the type carriage X', Figure 3, exactly at the moment when the
cylinders commence to work. The rack is of the description used in the well-
known mangle motion, and with it engages a pinion U which is pivotted to an arm
on the sleeve, the grooved bar T (Figures 2 and 5) being employed for the purpose
of controlling the position of the said pinion around the rack.
By means of the toothed wheels D, D', of equal diameter, the axis o likewise
describes half a revolution, thus bringing the excentrics b to one or the other of
their dead points upon a horizontal line at the end of each movement of the rack F.
When the printing is actually being performed, that is to say, while the rack F
and bed X are moving, the sleeve E is absolutely motionless, and at the same time
the cylinders are prevented from moving vertically, which arrangement is very
favorable to the efficient working of the machine.
The details of the intermediate mechanism between the sleeve E and the levers C
for alternately raising and lowering the cylinders may be modified, the principal
feature consisting in the novel application of the circular intermittent motion of the
sleeve.
Rotary motion is imparted to the cylinder A by means of an intermediate toothed
wheel Fi in gear with a wheel G fast on the axis of the cylinder, the latter being
driven by a pinion H on the driving shaft M. In order to allow for the alternate
ascending and descending motion of the cylinder A and wheel G, the wheel F¹ is
carried upon a pin fixed to one end of a jointed arm I provided with a fork f for the
purpose of engaging with a prolongation d of the vertical arm C of the T lever.
A lateral motion is thus imparted to the intermediate wheel F¹ at each displacement
of the wheel G, so that the teeth of the respective wheels are always properly in
gear.
In perfecting printing machines the cylinders make two revolutions in order to
print one sheet, and the grippers are worked in a different manner for each of the
two revolutions of the cylinder; for example, in the machines constructed in the
usual manner the following movements have to be performed, videlicit :-
First. Bring the cams into position for the first revolution.
Second. Withdrawing these cams and bringing others into position for the second
revolution.
Third. In order to return to the point of departure, withdrawing the last-named
cams, and bringing into position those for the first revolution.
In the machine constructed according to my said Invention, the mechanism for
working the grippers is considerably simplified.
All the cams connected with each cylinder are arranged on discs K, Figure 4, in
the same plane, mounted loose upon the shaft O of the cylinder. In order that the
cylinder and the grippers should only require to make one revolution for the
printing of each sheet relatively to these discs, the latter are caused to rotate in the
same direction as the cylinders, making one revolution during the printing of each
sheet.
The arrangement of the disc K is peculiarly adapted for working the grippers of
the cylinder, as the grippers upon the disc make one revolution to each sheet
printed; it is also very conveniently arranged in combination with the other

page_text: motions of the machine, as it makes one revolution to each sheet printed, with
relation to the fixed axes of the machine.
The discs K, one on each cylinder, carry the cams for working the grippers,
together with the cams for working the end of the feeding table R, and those for
working the rollers for delivering the printed sheets.
The mechanical arrangements by means of which the discs K are caused to
describe one revolution to each sheet printed whilst the cylinders describe two
revolutions in the same time are shown in section, in Figure 4 (Sheet 3), and con
sist of four bevel wheels L, P, P, and Q, working in the manner of sun-and-planet
gearing, but other mechanical arrangements capable of producing the same effect
may be employed.
Another characteristic feature of my said Invention consists in the mode of
working the inking rollers.
A wheel (Figure 5, Sheet 3), driven by the wheel H on the driving shaft M of
the machine, turns an endless screw or worm 8, engaging with two worm wheels t,
fast upon the lower ends of inclined shafts k, the latter being provided at their
other ends with bevel wheels m in gear with bevel wheels n fast on the axes of
inking rollers l.
Two springs S, Figure 3, are employed underneath the type bed or carrier, which
are alternately compressed at opposite ends by fingers provided upon the carrier, in
order to enable the same springs to be utilized for each end of the travel of the type
carrier.
The details of the machine may be varied without departing from the principle
of my said Invention.
Having now described and particularly ascertained the nature of my said Inven-
tion, and the manner in which the same is or may be used or carried into effect,
I would observe in conclusion that what I consider to be novel and original,
and therefore claim as the Invention secured to me by the herein-before in part
recited Letters Patent is,-
First. The peculiar mode of obtaining the alternate oscillating motion of the
levers C or other equivalent supports for the cylinders A, B, for the purpose of
effecting the raising and lowering of the said cylinders, substantially as herein-
before described.
Secondly. The employment of the intermediate wheel F¹ having an alternate
rising-and-falling motion, substantially as and for the purpose herein-before
described.
Thirdly. The arrangement of the discs K perforining one revolution for each
sheet printed, and carrying the cams for working the grippers, the end of the
feeding table R, and the delivery mechanism, substantially as herein-before
described.
Fourthly. The mode of operating the inking rollers, substantially as berein-before
described.
In witness whereof, I, the said Theodore Dupuy, have to this my Specification
set my hand and seal, this Twenty-seventh day of January, One thousand
eight hundred and seventy-nine
THEODORE DUPUY. (L.S.)