IMPROVEMENTS IN PENTAGRAPH ENGRAVING MACHINES EM- PLOYED IN THE ENGRAVING OF CYLINDRICAL OR OTHER SURFACES
Year: 1868

page_text: PROVISIONAL SPECIFICATION left by Georgo Moulton at the Office
of the Commissioners of Patents, with his Petition, on the
1st February 1868.
I, GEORGE MOULTON, of the City of Manchester, in the County of
Lancaster, Engineer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN PENTAGRAPH ENGRAVING MACHINES EM-
PLOYED IN THE ENGRAVING OF CYLINDRICAL OR OTHER SURFACES," to be as
follows:-
My Invention relates chiefly to the pentagraph engraving machines
employed to engrave patterns or designs on the surfaces of cylindrical
rollers, as is well understood, but may be adapted to machines
employed to engrave surfaces otherwise formed. In the aforesaid
machines it is desirable at certain times to be able to reverse the
motion of the tools so as to effect a change in the pattern or in
the repetition of the pattern usually understood as "turning over,'
whereby without changing the direction of motion of the pentagraph
the direction of motion of the engraving tool or tools may be reversed;
"

page_text: This
and my Invention relates to an improved method of effecting such
reversal in the case of machines having but one row of tools, and for
effecting the "stepping" of the pattern, or the changing of the
positions of portions of the design or repetitions of the same.
reversal I effect by connecting the tool bar to an endless band or a
band acting as an endless band and passing around drums or pullies,
the said tool bar being connected either to one portion of the band
or to another portion of the band, moving in a contrary direction
according as the tool bar is required to move in the same direction
as the bar moved by the pentagraph, or in a direction contrary
thereto, the arrangement I prefer being as follows:-The tool bar
to which the tool carriages are fixed is mounted upon rollers so as
to be moved easily in either direction as is usual. The said rollers
work upon suitably formed surfaces on a lower or intermediate
bar or rail, the said rail also moving on rollers working on a fixed
bar or bed, the said rail being actuated by the pentagraph in any
usual or suitable manner. The said rail actuates a drum or pulley
by means of a band or of bands of steel or other suitable
material, the said bands being attached to the drum and to the said
lower rail in such a manner as that when the rail is moved one
band or one end of the band is unwound from the surface of the
drum at the same time that the other end thereof is wound thereon,
thereby effecting the rotation of the said drum. The movecmnt of
the said drum is imparted to the tool bar by means of a second band
or by means of two other bands fixed to another portion of the said
drum, the arrangement when one band is employed being that the
said band is passed partly around a carrying pulley situated at a
suitable distance from the drum, and the two ends of the band are
brought partly around the drum and are affixed thereto by means of
a screw so arranged as to draw both ends of the band tight, or by other
suitable means. On a suitable part of the tool carriage an adjusting
slide is fitted, the said slide being provided at each side with a clip,
the two clips being operated by a screw in such a manner as that
the said clips are alternately tightened and released according as the
screw is turned in one direction or the other, the band above and
last mentioned passing between the said clips and the carriage, so that
on one of the clips being tightened the tool bar will be connected.
with the band sufficiently to be moved thereby, and as the two

page_text: portions of the band situated on each side of the tool bar move in
opposite directions the said tool bar will be moved in either direction
according as it is connected by means of the clips to the band on one
side or the other. The "stepping" or "changing" is readily effected
by releasing both clips and moving the tool bar in either direction as
required.