Year: 1886

page_text: I HEINRICH AUGUST CARL LEHMANN, of Berlin in the Empire of Germany do̟
hereby declare the nature of this invention to be as follows:-
My Invention relates to an improved copying press, and it consists in the
employment, in lieu of the ordinary screw, of an arrangement by means of which
copies may be speedily obtained.
According to my Invention, the press is constructed with a bridge which has a
longitudinal alot through which a lever extends, the end of the lever being formed
with a boss which is mounted eccentrically on pivots in the bridge. Instead of the
ordinary pressure screw, I employ a thrust rod which takes the place of the
pressure screw, and is formed at its upper part with a head in which the boss of
the lever is free to turn, while at its lower part the rod screws into a nut which is
screw threaded exteriorly but in the reverse direction and screws into a socket
attached to the platen. The bead of the thrust rod is formed so as to give passage
to the lever which, when the press is in use, is thrown over on the pivots, so that
the eccentric boss shall bear on the head of the rod and impart pressure to the
platen When the platen is to be raised the lever is thrown over in the reverse
direction. The pivots on which the lever turns pass freely through slots in the
head of the thrust rod. The head of the rod being guided by vertical slots in.
the bridge.

page_text: Improvements in Copying Presses.
I HEINRICH AUGUST CARL LEHMANN, of Berlin, in the Empire of Germany, 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:
The object of this Invention is to provide a copying press of light construction
in which good copies may be rapidly obtained; and the Invention consists
essentially in substituting for the ordinary pressure screw by which the platen is
operated an eccentric or cam boss worked by a lever in combination with a thrust
rod arrangement constructed in parts screwing together so as to be readily
adjustable to suit the thickness of the book to be pressed, the. whole being
constructed and operating as hereinafter described..
Reference is to be had to the accompanying drawings forming part of this
specification wherein Figure 1 is a plan view of the improved press. Figure 2 is
an elevation shewing the platen raised. Figure 3 is a similar view shewing the
press in use. Figure 4 is a vertical section on line 1-2 figure 1, the platen being
raised. Figure 4 is a part section on line 1-2, and figure 5 a section on line 3-4
shewing the position of the parts when the platen is down and the press in use.
Figure 6 is a longitudinal section of the bridge separately.
The bridge B is rivetted or otherwise fixed to the bed A and has a slot C at the
centre, the sides a a¹ of which are formed with guides D D in which the bead E
of the thrust rod F slides.
The thrust rod F is screw threaded and screws into the nut and bandwheel G
which is also screw-threaded exteriorly with a reverse thread to that of the rod F
and screws into a socket H attached to the platen K by means of the flange j.
By means of the combination of right and left handed screws the platen may be
adjusted to suit the thickness of the book.
L is a lever terminating in a cam or eccentric L pivoted on pin b which is
mounted in the bridge B The head E of the thrust rod F is forked to embrace the
cam, and has slots M M' through which the pin b passes.
The slotted cheeks of the forked. head E have inwardly turned lips & under
which the part c of the cam takes when the lever is thrown to the right, as in
figure. 4, to raise the platen.
When the lever is thrown to, the left, as in Figure 3, the part of the cam will
bear upon the head E and press it down, thereby imparting pressure to the platen
through the thrust rod.
The platen K is provided with guides N N¹ working on the uprights of the
bridge B to prevent the platen turning. The bridge B may be so connected to the
bed A as to permit of its being readily removed or turned up against the side of
the bridge for packing.
In the latter case either or both of the guides N N' should be hinged to the
platen to facilitate their disengagement from the bridge.
To take a good copy, it is simply necessary to adjust the platen by means of the
hand wheel screw G, so as to leave sufficient space to insert the copying book, or

page_text: other object to be pressed, between the platen and bed. By pulling over the lever
to the left sufficient pressure is imparted to the platen K to obtain a good copy.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed; I declare that what
I claim is ;-
1st The combination with the platen K of the eccentric or cam L¹, the screw
thrust rod F, a handwheel nut G having inner and outer reverse threads and a
socket H for the purpose of adjusting the platen to the object to be pressed,
substantially as specified.
2nd The head E constructed as described and attached to the screw thrust rod F
in combination with the cam or eccentric L³ upon the lever L for operation in the
manner and for the purpose specified.