CERTAIN IMPROVEMENTS IN PANTOGRAPHS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Carl Pieper at the Office of the
Commissioners of Patents on the 23rd July 1883 a communication to me
from A. Keller-Dorian, graver, of Mühlhausen, Alsatia, German Empire,
CARL PIEPER, Civil Engineer and Patent-Agent, resident at 109/110 Gueisenau-
Strasse, Berlin S. W. Prussia, "CERTAIN IMPROVEMENTS IN PANTOGRAPHS" a
communication to me from A. Keller-Dorian graver, of Mühlhausen, Alsatia,
German-Empire,
This invention relates to pantographs for engraving printing rollers or plates,
i.e. to apparatuses serving to transfer a drawing in reduced size to a roller or plate
to be used in printing on cloth or other material.
The apparatus is represented on the annexed sheet of drawings in plan.
C is a fixed table on which the drawing to be copied is placed, and W a roller
covered with a coat of etching-varnish which is to receive to engraving. g is the
tracing pencil and n the engraving point. The arrangement of the apparatus is
such that all movements of the pencil g from the right to the left or vice-versa,
which I shall call the horizontal movements, are transferred in the same or in
opposite direction to the point n, while the movements to and away from the
operator, or the vertical movements, cause a rotation of the roller W, which is
carried by the centres R.
The pencil g is fixed to a slotted guide bar G constituting a part of a carriage
F running with its wheels F1 in ways forming rebates or grooves on the carriage
E, which in its turn, runs with the wheels E¹ in stationary ways, not shown in the
drawing. Into the slotted guide bar G is fitted a slide-block pivoted at / to a lever
L having its fulcrum at 12 and engaging at by means of a pivot adjustable on
the lever, with a slide-block working in the slotted bar R. This bar forms part of
a carriage K connected by the arms R' and m¹ to a carriage M, to which is
attached the arm N bearing the engraving-point n.-Both carriages K. and M run
with their respective wheels K' and M on stationary ways. Moreover the
carriage E is provided with a slotted bar e, in which slides a block pivoted at h to
the lever H, turning on 2, and engaging at by an adjustable pivot with a slide
block movable in the slotted bar i. This bar is attached to a carriage I running
with its wheels I in stationary ways arranged above the carriage E. On the

page_text: carriage I there is a part P having a band of metal Qattached thereto, which is
slung around the end of the roller W..
When the pencil g is moved in any direction the horizontal component of its
motion will be transferred by the carriage F and the lever L to the carriages K
and M, and the engraving point n, the notion of n bearing to the horizontal
- notion of the proportion of the' length of the lever arm 12, 1' to that of the arm
12. The vertical component of the motion of g is transferred by the. carriage E
and the lever H to the carriage I and the metal band Q, which latter consequently
imparts to the roller W a rotative motion the extent whereof is in proportion to
the vertical motion of gas the length of the lever arm ², h' is to the length
of h³ h.
The band is conducted over sheaves p² and fixed with its ends to a slide fitted
between ways on the part P and adjustable by a screw. This allows the roller to
be turned by the required angle when a strip thereof has been finished and the
design is to be repeated. Instead of the band Q a friction bar may be used which
acts on a friction disk secured to the roller. The centres R are arranged to be
raised and lowered simultaneously so that the roller W may be adjusted at the
required height. When a plate is to be engraved, the same is attached to the
carriage I.
The carriage K and M may be connected to each other by a metal band running
over sheaves, so that the motion of the one will be transferred to the other one in
contrary direction.-Besides there may be two carriages M, each heaving an
engraving point, the two points working on opposite sides of the roller.
For certain purposes it is of advantage to have a second tracing pencil gl.
attached by an arm G' to the bar G.