IMPROVEMENTS IN
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office of
the Commissioners of Patents on the 28th July 1883.
CARL PIEPER of Altona in the German Empire
PANTOGRAPHS,"
"IMPROVEMENTS IN
This invention relates to improvements in extension frames of india rubber
pantographs applied for reproduction of printings in colours in reduced or enlarged
dimensions and furthermore to the construction of parts of the press employed for
transporting the impression of the design from the india rubber diaphragm onto
the stone or printing plate, or vice versa from the stone or printing-plate onto the
india rubber diaphragm.
The india rubber diaphragm is attached to the extension frame by means of
cramps formed of sheet metal and each furnished in front with a fulcrumed lever
one arm of which catches into the rim or border of the diaphragm while the other
end, projects above the cramp and if pressed down by hand, releases the
diaphragm.
The frame itself consists of bars of iron or other suitable material to which are
attached extension shears formed of double fulcrumed levers of which one end of
each pair is in connection with the hinder end of one of the before described
cramps catching the border or rim of the diaphragm.
By drawing the bars out, the shears are widened and the surface of the india
rubber diaphragm is consequently extended, or stretched out while it contracts as
soon as the bars are narrowed so as to enclose a square of small dimension.
The cramping action of the levers before described is automatically as the lower
arm of each lever grips stronger into the border or rim of the diaphragm the
heavier a strain is executed to the latter by enlarging its extension. For removing

page_text: or exchanging the india rubber diaphragm the top arm of each lever is pushed
downward in consequence of which the bottom arm of the lever that grips tho
diaphragm turns upward and allows the diaphragm to be drawn out from the
cramps.
For printing off the desegn from the stone onto the surface of the diaphragm, or
vice versa, a screw press is applied the head of which is placed on rollers to run it
across the printing stone after the frame carrying the diaphragm has been put
down in a manner that the diaphragm is brought on top of the printing stone. The
head plate of the press is then forced down by a screw and lever, the india rubber
diaphragm onto the stone for the purpose either to receive or to deliver the
imprint.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Pieper in the Patent Office on the 28th January 1884.
CARL PIEPER of Altona in the German Empire
PANTOGRAPHS"
66 IMPROVEMENTS IN
This invention relates to improvements in the extension frames of india rubber
pantographs applied for reproduction of printings in colours in reduced or enlarged
dimensions and furthermore to the construction of parts of the press employed for
transporting the impression of the design or drawing from the india rubber
diaphragm on to the stone or printing plate or vice versa from the stone or
printing plate onto the india rubber diaphragm
The india rubber diaphragm is attached to the extension frame by means of
cramps formed of sheet metal and each furnished in front with a fulcrumed and
preferably bent lever, one arm of which lever catches the rim or border of the
diaphragm whilst the other end projects above the cramp and if lifted (or pressed
down in case the lever is formed without a bend) by hand, releases the diaphragm.
The frame itself consists of bars of iron or other suitable material to which are
attached extension bars or shears or so called lazytongs formed of double fulcrumed
levers of which one end of each pair is in connection with the hinder end of one
of the before described cramps catching the border or rim of the diaphragın.
By drawing the bars out, the extension bars or "shears " or lazytongs are
widened and the surface of the india rubber diaphragm is consequently extended,
or stretched out while it contracts as soon as the bars are narrowed so as to enclose
a square of smaller dimension.
The cramping action of the levers before described is selfacting as the lower
arm of each lever grips more strongly into the border or rim of the diaphragm
the heavier the strain is that is exerted upon the latter in enlarging its extension.
For removing or exchanging the india rubber diaphragm the top arm of each of
the bent levers is lifted in consequence of which the bottom arm of the lever that
grips the diaphragm turns upward and allows the diaphragm to be drawn out from
the cramps.
For printing off the design from the stone onto the surface of the diaphragm or
vica-versa, a screw press applied the head of which is placed on rollers to run it
across the printing stone after the frame carrying the diaphragm has been put down
in such manner that the diaphragm is brought over the printing stone. The head
plate of the press is then forced down by a screw and lover pressing the india
rubber diaphragm onto the stone for the purpose either of receiving or to deliver
off the impression.
In the accompanying sheet of drawings is illustrated the construction according
to this invention wherein Figs 1 to 7 relate to constructions of the extension
frame whilst Figs 8 and 9 represent the before mentioned screw-press.
Fig 1 is a sectional view, Fig 2 an end view and Fig 3 a ground plan of the
cramps applied for catching and holding the india rubber diaphragm H. Each
cramp consists of two parts, the body a with hook b by means of which the cramp
is attached to the extension frame and a double armed lever d, c fulcrumed to arms
e, e of body a. The india rubber diaphragm is slipped into the cramp by lifting
Jever d in consequence of which arm c moves upward and opens the cramp body.
By pushing lever d downward arm c is forced down onto the diaphragm which
pressure is automatically increased during the extension of the diaphragm. The
fastening of the diaphragm by these cranips can be executed in a very short time.
Fig 4 is partly cross section and partly end view of the extension frame while

page_text: Fig 5 is a ground plan of same partly shown in extended and partly in reduced
position. The cramps before described are by means of hooks b attached to
openings of the cramp holders g, which latter are for the purpose of securing
parallel position to each other and also for securing equal distance apart of each
other during the movements of the frame parts, guided at two points h and i of
the double crossed shears mechanism,
The bolts at h move in slots of the cramp holders g.
Figs 6 and 7 represent respectively end view and plan of detached corner pieces
shown in Figs 4 and 5 in combination with the frame and applied for keeping the
sides thereof in all positions at right angles to each other and for combining the
ends of the four shears or lazytongs of the frame as will be readily understood by
reference to Figs 4 and 5 of the drawings. These corner pieces consist each of a
metal plate placed between two neighbouring frame-bars to which they are
attached by means of bolts and guided within longitudinal slots by means of
-projecting rims, cast to opposite sides of plate, is an opening_for_the
connecting bolt before mentioned.
The extension frame is by means of borings m and screw bolts or other suitable
arrangement attached to a screw frame by means of which the shear or lazy tong
frame is extended as well as reduced. This screw frame may be of any known
construction and as it does not form part of this invention it is not shown in the
drawings. The screw press which is represented (on a smaller scale than the
before described parts) in Figs 8 and 9 of the drawings contains the following new
_arrangement..
The application of a screw press is of advantage as it secures uniform pressure
acting simultaneously on all parts of the diaphragm, a is the head of the press
and b the pressure plate P represents the printing stone applied for receiving the
impression from the diaphragm or for giving off a design or impression thereto.
The pressure head a together with pressure screw and pressure plate b are placed
-on-rolleis-d, d, guided-to-the-table-by-means-of-bars-or rails-c-and-f which rails
give the required resistance to the pressure head during the action of the screw.
This construction allows of removing the press head during adjustment of the
diaphragm to the printing stono.
Having now described the nature and particulars of the said invention, I
claim :-
Firstly. The means or method of attaching the india rubber diaphragms of
pantographs by means of adjustable self acting cramps guided parallel to each
other by a double shear or lazytongs frame as herein described in reference to and
shown by Figs 1, 2, 3, 4 and 5 of the drawings..
Secondly. The construction of double sheared or lazytong extension frames as
described with reference to and shown by Figs 4 and 5 of the drawings
Thirdly. The corner pieces as herein described and as shown by Figs 6 and 7 of
the drawings.
Fourthly. The improved means for taking off impressions from or of delivering
impressions to printing stones by means of the screw press placed on rollers as
herein described with reference to and as shown by Figs 8, and 9 of the drawings.
In Witness whereof I the said Carl Pieper have hereunto set my hand and seal
this twenty fourth day of January in the year of our Lord One thousand eight
hundred and eighty-four.