Year: 1888

page_text: I ADOLF ERDMANN of Graskeller 21, Hamburg, in the Empire of Germany
Engineer 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 :-
This invention consists in an improved copying press having certain novel feature
as hereinafter described and suitable more especially as a travelling copying press by
reason of its small weight and the small space it occupies. The press is represented
in the accompanying drawing in which Fig. 1 is a plan view thereof. Fig. 2 a front
view, Fig. 3 a side view with copying book inserted and Fig. 4 a side view without
copying book showing the pressure lever in section. All figures show the press in a
closed state.
The press consists of an under board or plate 6 of a lid or upper plate a of a hinge
spring fat the back and of a closing mechanism in front.
The special novelty of the construction lies in the bow shaped spring f forming the
back of the press which is firmly secured to the bed plate b whilst it is connected
with the lid a by a hinge joint'm so as to allow the lid to be lifted as indicated by the
dotted lines in Fig. 4.
The spring is so made and devised, that when the copying book R is not in the
press, the distance between a and b along the back part is somewhat less than the
thickness of the book R so that after the insertion of the book and the lowering of
the lid sufficient pressure is exerted by the spring f on the book, to enable the copying
to be done. In front, connection is made between the plates 6 and a by the hand
lever h pivoted on the gudgeon i on the bottom plate b, said lever having the flange u
eccentrically formed with regard to the pivotal axis of the lever and adapted to
engage around the pin k on the lid. The pins i and k are suitably fixed by metal.
frames sands on the respective parts of the press as shown in the drawing. When
the lever his lifted as shown in Fig. 2 in dotted lines, the pin k is released and the
lid a can be raised on its hinge joint m.
Instead of one pressure lever there may be arranged two such levers and parts in
front of the machine.
c

page_text: The plates a and b are preferably made of wood each of 3 veneers glued together.
The veneers are arranged so that the grain of the wood in each crosses that of the
veneer next above or below. The plate a is suitably made somewhat curved that is to
say curved or bent downwards in the centre, so that the pressure on the copying book
is equalized throughout since the ends of the plates are pressed down by the spring
and lever respectively. A rail is fixed along the front of the bottom plate b and
serves as a guide for the edge of the copying hook R when inserting the same in the
press, the lid also rests upon this rail when the copying book is withdrawn from the
press (Fig. 4).
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :—
1. In copying presses the combination of the bed plate b, the spring f fixed to said
bed plate and the plate a hinged to said spring f substantially as set forth.
2. A copying press comprising a bed plate a spring ffixed thereto, a plate a
hinged to said spring, a pin and a pivoted lever having a flange u adapted to
engage on said pin and a rail t the whole combined substantially as and for the
purpose described,
Dated this 22nd day of November 1888.