Improved Inking-device for Printing-machines.
Year: 1892

page_text: Date of Application, 29th Feb., 1892--Accepted, 2nd Apr., 1892
COMPLETE SPECIFICATION.
Improved Inking-device for Printing-machines.
We, OSKAR RIESE and HERMANN POHL both residents of 52, Görlitzer
Strasse, Berlin, Kingdom of Prussia, German Empire, Manufacturers do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
Our invention relates to printing-machines with oscillating platen, and consists in
an inking-device in which the roller taking the ink from the feeding-cylinder is
given one complete revolution during the time it is in contact with the same, and in
which the feeding-cylinder remains at rest during the time the distributing roller
is passing over the distributing plate, from which the ink is taken to the types by
means of inking-rollers.
The better to make our meaning clear, we will proceed to describe a machine
fitted with our inking-device as represented on the accompanying drawings, on
which:-
Fig. 1 is a side-elevation of the machine.
Fig. 2 is a rear elevation of the same, in the direction of the arrow P in Fig. 1.
Fig. 3 is an upper view of the same, in the direction of the arrow P' in Fig. 1.
Figs. 4 & 5 are details showing two different positions of the eccentrics and
cam disc s.
Similar letters refer to similar parts throughout the several views.
A is the frame of the machine, and a the driving shaft of the same, on which
the Hy-wheel is mounted. a is the pivot on which the platen oscillates; the platen
itself is not shown on the drawing, the bed is fixed to the frame at B. At the
upper end of the bed B there is pivotted to the frame the distributing-plate T, and
bis the axle to which are secured the arms carrying the inking rollers, which are
guided over the distributing plate T and the bed B. As the construction of these
arms and rollers does not differ from the usual one, we have not shown these parts
on the drawing.
Motion is transmitted from the driving-shaft a to the shaft a by means of toothed
wheels gearing into another, as indicated by dotted lines in Fig. 1. On the shaft c
there is a crank i, to the end of which is linked the connecting-rod 2 extending
upwards, the free end whereof is provided with teeth, thus forming a rack. These
teeth engage with those of the ratchet-wheel m. loosely mounted on the axle of the
feeding-cylinder, the bearings whereof are provided in the frame A of the
machine. The feeding-cylinder is placed in the usual manner before the ink-
tank K fixed to the frame A. To the ratchet-wheel there is secured an arm
carrying the click p, which is pressed into the indentations of another toothed
wheely firmly mounted on the axle of the feeding-cylinder, by means of a spring
not shown on the drawing. It will be understood, that when the connecting-rod
descends, it rotates the feeding-cylinder f, as the click p engages with the toothed
wheel but when the connecting-rod z moves upwards, the click p glides over the
teeth of the said wheel, and the feeding-cylinder is not rotated.
The upper end of connecting-rod is also guided by means of a roll a pivotted
to the frame A.
r
On the shaft c we also mount a cam-shaped discs and at the side of the same an
eccentrics (Figs. 1 & 2). The discs is of the form shown in Fig. 1, having a
semi-circular portion. The cam-disc s is constantly in contact with an upper roll r
and the eccentric s' with a similar lower one r'. Both rolls and are secured to
the slide G, which is guided on the shaft c by means of the slot d and in a guide ¹
on the frame A, by means of an inferior extension e. The shape of the cam-disc s
and eccentric s is such that the rolls and are always held exactly the same
distance apart, and constantly rest on the said disc and eccentric, as already

page_text: mentioned. To the upper end of the slide there is linked the connecting-rod L,
which is again linked at o to the swinging, fork.S, pivotted to the frame A. at gg.
To the ends of the fork S there are secured in tlie usual manner the rods h, fitted
with springs ', and receiving the axle of the distributing-roller l'in.hooks provided
at their free. ends.
The operation of our improved inking-device is as follows:
are
In Fig. 1 the distributing roller has just reached its highest position, the shaft c
revolving in the direction of the arrow, and said roller is thereby pressed against
the feeding-cylinder f. It will be seen that the latter is already in rotation when
the distributing-roller is applied to the same, as the crank and connecting-rod-
have already begun their downward course. The roll now glides over the semi-
circular portion of the cam-discs during. half a revolution of shaft c, and the
distributing-roller remains pressed against the feeding-cylinder all this time,
until the position illustrated by the diagram Fig. 4 is reached. The distri-
buting-roller is during this whole period rotated together with the feeding-
cylinder, and the teeth of the ratchet-wheel m and the connecting-rod
arranged in such manner, that the feeding-cylinder performs a complete revolution
during the mentioned period. Before the rotation of the said feeding-cylinder fis
stopped, (when the connecting-rod begins its upward course), the eccentric s¹
depresses the lower roll and thus moves the distributing-roller off the feeding-
cylinder, and gradually brings the same into the position shown on Fig. 1 in
dotted lines, when the eccentrics, cam-disc s, rolls and and shafte occupy the
position illustrated by the diagram Fig. 5. During this movement the ink is
distributed from the distributing-roller on the distributing-plate T. We have
adopted this manner of moving the distributing-roller off the feeding-cylinder f
before the rotation of the latter is stopped, in order to secure a completely
uniform distribution of the ink on the distributing-roller 1, which would be
impossible otherwise.
The shaft e continuing its rotation, the position Fig. 1 is soon reached again, and
then the movements repeat as described.
It will be understood that the movement of the distributing-plate T and of the
inking-rollers is such as not to interfere with that of the described mechanism.
The cam-disc and eccentric may also be replaced by grooves shaped
accordingly, in which the rolls and would be guided..
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is
In printing-machines with oscillating, platen: The combination with the shaft c
having the cam-discs, eccentric and crank. of the rolls and fixed to the
slide G, guided on the shaft e by means of the slot d, and in the guide e¹ by
ineans of the extension e, of the connecting-rod L linked to the slide G and at o to
the swinging fork S' pivotted at gg, and to which are secured the rods / provided
with springs and receiving the axle of the distributing roller in their hooked
ends, of the connecting-rod guided at its upper end by the roll and having teeth
engaging with those of the ratchet-wheel m, which is loosely mounted on the axle
of the feeding-cylinder and to which is secured an arm carrying. the. click
which engages with the toothed wheel keyed on the axle of the feeding-cylinder f,
the number of teeth on the connecting-rod z being, such as to effect a complete
revolution of the feeding-cylinder at every downward movement, substantially
and for the purpose as described.
9
P
By Fredk. Walker,
OSKAR RIESE..
HERMANN POHL.
11, Furnival Street, Holborn, London, E.C., Agent for the Applicants."