Improvements in Printing-presses.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Printing-presses.
We, AMBROS BOHN and ADOLPH HERBER, both of Würzburg in the
Kingdom of Bavaria, Empire of Germany, Manufacturers, do hereby declare the
nature of our said 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 bed, and consists,
first, in the arrangement and function of several inking-cylinders, and secondly, in
a device provided on the platen for the purpose of regulating the pressure with
which the said platen is pressed on by the types in the bed of the press.
The better to make our meaning clear, we will proceed to describe the con-
struction and operation of our improvements, referring to the accompanying
drawing, which shows a printing-press fitted with the novel devices forming the
subject of this invention, and on which
Fig. 1 is a side-elevation of the machine,
Fig. 2 shows the arrangement of the inking-device,
Figs. 3 & 4 are cross-sectional view and elevation respectively of the regulating
device provided on the platen.
Similar letters denote similar parts throughout the different views.
The characteristic feature of the inking device is the manner in which the inking
cylinders are applied upon the types; said cylinders rest on the latter merely by
their own weight and, when the bed approaches the platen, are raised against a
cylinder distributing the ink on the inking cylinders and pressed against the
circumference of this distributing cylinder, in which position they are held until
the bed separates from the platen and the types are enabled to receive fresh ink
from the inking cylinders. At the same time the cylinder feeding the ink into the
machine is rotated and a suitable roller is raised until it comes in contact with the
said feeding cylinder; this roller is caused to rotate in contact with the feeding
cylinder for more or less time, and then is lowered again and, turning in contact with
the distributing cylinder, applies the ink to the same, whence it is taken to the
inking cylinder.
In Figs. 1 and 2 a is the feeding cylinder, 6 the roller, c the distributing cylinder
which revolves in bearings fixed to the frame of the machine, d the distributing
roller, e a similar smaller one made of steel, and ff the inking cylinders.
Motion is imparted to the parts of the machine in the following way: By means
of the crank t on the driving shaft x and of the connecting rod u the oscillating
motion of the levers s is effected. To one of said levers is linked the connecting
rod e indicated by the dotted lines which operates the toothed sector 2 also shewn
by dotted lines the latter engages with a toothed wheel c³ on the axis of which is the
toothed wheel c which is of greater diameter and engages with the toothed wheel e
keyed to the axle of the distributing cylinder c. Thus the latter is rotated. The
distributing cylinder c is also constantly displaced laterally, which is effected by
threading a portion of the axle of the same, and causing this portion to revolve
within a threaded bearing.
The inking cylinders f shewn by the dotted line Figure 2 are provided with
grooved or flanged ends adapted to run upon the rails g of the bed. The axles of
the inking cylinders have their bearings in a double forked arm or lever / which
is capable of turning upon the pivots i thus imparting a rocking motion to the
aforesaid lever. The latter also is connected to a bar k which in turn is linked to

page_text: the lever arms P. These are of equal length and are pivotted to the frame of the
machine.
We thus attain a perfectly parallel motion in the direction of the bars k and of
the parts connected therewith. In order to ensure this parallel motion, when the
inking cylinders ff and their pulleys y are removed from the machine for repairing
or replacing them by new ones, the pivots i are provided with pulleys or wheels r
indicated by dotted lines Fig. 2 which then take the place and functions of the
pulleys y.
One of the bars k is extended downwards and carries at its end the wheel m.
One of the oscillating levers s has a curved end s¹ which during a part of its course
lifts the wheel m and thereby the inking cylinders f.
One of the levers 12 has a second arm o, to which is linked the rod Pi and this
one is again connected to the part 7 by means of which intermittent rotation of the
feeding cylinder a is effected.
One of the levers is fitted with a curved piece which acts as a lever and serves
to lift the roller b; the shape of this curved piece is such, that when the part
from 1 to 2 (Fig. 2) is in contact with roll n, it lifts the latter, and also the roller b
by means of the bent levers z, pivoted at 2¹, partly indicated by the dotted outline
Fig. 2 in the ends of which the rollers and n revolve. When the part from 2 to 3
of the mentioned curved piece is in contact with roll n, the position of the latter
remains the same, as the curve 2-3 is an arc concentrical with the pivot of P.
The operation of the inking apparatus is the following:
In Fig. 2 the bed is shown in its extreme position off the platen. The oscillating
levers is in its farthest position to the right, the curved end s has slipped from
underneath the wheel m and thereby allowed the inking cylinders to be lowered
on the bed. The pulleys rest on the rails g, and the inking cylinders fare by
their own weight slightly pressed upon the types and roll over the same as the bed
moves on. At the same time the roller has been allowed to sink down on the
distributing cylinder c and rotates together with the same thereby conveying the
ink to the same; the lever o has lifted the part q, so that the feeding cylinder a is
released and may start to revolve.
During the return movement of the bed, the inking cylinders fare gradually
raised until the bed is nearly vertical, when the said cylinders are close below the
distributing cylinder c. At this moment the oscillating levers has so far moved to
the left, that the curved ends of the same slips again underneath the wheel m and
thereby lifts the inking cylinders foff the bed, and presses them against the
distributing cylinder c, in which position they are left until the bed, moving in the
contrary direction, has reached the same point. During all this time the ink is
distributed on the inking cylinders by the distributing cylinder c, which rotates
and at the same time is displaced laterally. At the same time as the inking
cylinders were lifted, the roller b was by means of the curved edge 1-2 and of
the roll n.raised against the feeding cylinder a and remains in contact with the
same as long as the curved edge 2-3 is in contact with roll n. As the feeding
cylinder a rotates during the whole period in which the inking cylinders fremain
lifted, the roller b partakes of this rotation and takes a broad stripe of ink from the
feeding cylinder a. This position is illustrated by dotted lines Fig. 1, the bed and
platen being pressed against another.
The whole inking device may be kept in this position for any length of time by
turning the lever e Fig. 1 pivoted to the frame of the machine which will thereby
lift one of the arms and prevent a downward movement of the same.
じ
The function of the rollers d and e is to secure a uniform distribution of the ink
over the circumference of the distributing cylinder c, but the employment of these
rollers does not form part of our invention, as the same have been in use for many
years.
The device for adjusting the platen is shown in Figs. 3 & 4. A is the platen,
B the part of the frame to which it is secured, C is a spindle with left-hand thread,

page_text: connecting A and B with another, the thread fitting into a corresponding female
one in the platen A. To the end of spindle C opposite the platen A is keyed the
band-wheel D. We also mount on the spindle C a toothed wheel E, which engages
with four smaller ones G mounted on the spindles F having right-hand threads
fitting into corresponding female threads in the platen A.
When turning the hand-wheel D, the wheels E and G revolve in opposite
directions, and as their threads on their spindles are also opposite ones, the platen A
is displaced forward or backward according to the direction in which the hand
wheel D is turned.
It is apparent that by giving the threads of the spindles Cand F the same pitch,
the platen A is displaced exactly parallel to its plane, and thereby the pressure
with which the printing is effected may easily be regulated.
By means of the small steel-plate J, inside the bearing for spindle C, and of the
screw H the spindle C may be locked in any position.
.
It is immaterial that the thread of spindle should be left-handed, and those of
the spindles F should be right-handed; the arrangement may of course as well be
the reverse one.
Instead of transmitting the motion from spindle C to spindles F by means of
toothed wheels, any other contrivance may be employed, such as friction wheels, or
chain-wheels; but we prefer to employ toothed wheels, as their function is the most
reliable one.
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 bed:
1. An inking device, in which the inking rollers move up and down in such way
that during part of the course of the bed they roll over the types, being pressed
upon the latter merely by their own weight, and during the remaining part are
lifted against a cylinder distributing the ink on the same, for the purpose as
described.
2. The combination of the driving-shaft, the connecting-rod u, and the
oscillating arms s, one of which has a curved end-piece s¹ for the purpose of
lifting and releasing the wheel m, as described.
3. The combination of the levers 11 12 with the bars k, one of which has at its end
the wheel m, for the purpose set forth.
4. The combination, with one of the levers 12, of the arm o, to which is linked
the rod p operating the part 9 by means of which periodical motion is imparted to
the feeding cylinder a, as described.
5. The combination with one of the levers 1, of the curved piece 1-2-3,
shaped as described and illustrated by Fig. 2 of the drawing, and of the roll n,
connected by means of the bent levers to the roller b, for the purpose of lifting
the latter against the feeding cylinder a and of holding said roller b in that position,
as described.
6. The distributing cylinder c, revolving in bearings fixed to the frame of the
machine, and displaced laterally by means of a threaded spindle, substantially as
described.
7. The combination, with the two double levers h, connected to the bars k, and
turning round the pivots i, provided with pulleys r, of the inking cylinders f,
having their bearings in the double levers h, and provided with pulleys y rolling on
rails 9 secured to the bed, substantially and for the purpose as described.
8. The lever v, pivoted to the frame of the machine and adapted to lift one of
the arms A, for the purpose as described.
9. The combination, with the platen A and frame B of the spindle C serving to
connect both, and provided with hand-wheel D and toothed wheel E, the latter
engaging with four wheels G mounted on spindles F; the threaded ends of

page_text: spindles C and F fitting into threaded holes in the body of the platen A, and the
spindle C being threaded opposite to the spindles F, for the purpose as described.
Dated this 30th day of January 1892.
By Fredk. Walker,
AMDR
ADOLPH HERBER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicants.