IMPROVEMENTS IN PENTAGRAPH MACHINES USED IN ROLLER ENGRAVING to be as follows
Year: 1885

page_text: I GEORGE MOULTON of Whiteley Street Manchester in the County of Lancaster
Engineer and Engraving Machine Maker do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN PENTAGRAPH MACHINES USED IN ROLLER
ENGRAVING to be as follows :—
"
My Invention relates to the engraving of pairs of rollers having the two rollers
in a pair in duplicate the patterns on the rollers either corresponding exactly in all
respects or being reversed as in the cases of the rollers used in back to back
printing that is to say in the printing of the same pattern on both sides of the
piece. In the engraving or preparation for etching of such rollers it is essential
that the pattern shall be produced in exact duplicate upon the two rollers in a pair
with the exception that in some cases the pattern is reversed upon one roller as
compared with the other as aforesaid. In machines which have been used for the
said purpose previously to my Invention the two rollers have been side by side or
one above the other but in consequence of the difficulty in producing exact
unison in the movements of the rollers it has not been possible in all cases to
obtain the absolute accuracy required.
According to my Invention I fix the two rollers upon one mandril or upon two
mandrils coupled together with their axes in line or I otherwise mount the two
rollers to revolve upon a common axis and couple or connect them together so that
they shall revolve in the same direction and in perfect unison. The tool carriage
is extended so as to carry the tools operating upon both rollers or separate carriages
connected together or actuated to move in unison may be employed. When the
pattern is to be reversed the tool carriages are so actuated as that the tools which
operate upon one roller travel at all times in a direction contrary to that of the
tools which act upon the other roller. This reversal of motion is effected by means
of bands which connect the tool carriages with a reversing wheel or by other
suitable means. In one arrangement each roller is secured upon a separate mandril
and the two mandrils are mounted in line and are connected together by means of
hinged or jointed coupling levers or arms so that a positive connection for trans-
mission of rotatory movements is obtained. In some cases the mandrils may be
dispensed with or only one roller may be provided with a mandril

page_text: Improvements in Pentagraph Machines Used in Roller
Engraving.
I GEORGE MOULTON of Whiteley Street Manchester in the County of Lancaster
Engineer and Engraving Machine Maker do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN. PENTAGRAPH MACHINES USED IN ROLLER
ENGRAVING "and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement and accompanying
drawings:
My Invention relates to the engraving of pairs of rollers having the two rollers
in a pair in duplicate the patterns on the rollers either corresponding exactly in all
respects or being reversed as in the cases of the rollers used in back to back
printing that is to say in the printing of the same pattern on both sides of the
piece. In the engraving or preparation for etching of such rollers it is essential
that the pattern shall be produced in exact duplicate upon the two rollers in a pair
with the exception that in some cases the pattern is reversed upon one roller as
compared with the other as aforesaid. In machines which have been used for the
Baid purpose previously to my Invention the two rollers have been side by side or
one above the other but in consequence of the difficulty in producing exact unison
in the movements of the rollers it has not been possible in all cases to obtain the
absolute accuracy required.
According to my invention I fix the two rollers upon one mandril or upon two
mandrils coupled together with their axes in line or I otherwise mount the two
rollers to revolve upon a common axis and couple or connect them together so that
they shall revolve in the same direction and in perfect unison. The tool carriage is
extended so as to carry the tools operating upon both rollers or separate carriages
connected together or actuated to move in unison may be employed.
In order that my Invention may be fully understood I have attached hereto
a sheet of drawings made to a scale of about three inches to the foot. In the
said drawings Fig. 1 represents a Front Elevation, Fig. 2 a Vertical Cross Section
and Fig. 3 a Plan of so much of a Pentagraph Machine constructed in accordance
with my Invention as is necessary to the proper illustration of such invention.
In the said Figs. a. a. are the ends of two rollers which are supposed to be in
process of being engraved and b. b. are the tool carriages. The framing of the
machine indicated by c. extends right and left from the central standard d. the
parts being in duplicate so that the two rollers can be operated upon at the same
time. The two rollers are carried by mandrils e. e. as is usual and these mandrils
are mounted to revolve upon a common axis that is to say the axes of motion of
the two rollers are arranged to be exactly in line. The bearings f. f. for the ends
of the mandrils appearing in Figs. 1. and 3. are mounted in the jaws of the
pedestals or bearing standards g. g. the other ends which do not appear in the
drawing for want of space being similarly mounted in bearings carried by the end
standards all four bearings being in line. Upon each end of each mandril is fixed
a friction wheel h. which rests upon a reciprocating bar i. the two bars which carry

page_text: one of the rollers by their to and fro movements imparting rocking movements to
the rollers as in ordinary machines. To ensure exactness of unison in the move-
ments of the rollers I couple together the contiguous ends of the two mandrils.
Upon each mandril end is clamped or secured a coupling arm k. and one of these
arms is formed with a jaw at its outer end. The outer end of the other arm
enters this jaw, adjusting screws or suitable means being employed to prevent
back-lash. I do not confine myself to this form of coupling as any suitable
form of coupling may be used. In place of mounting each roller upon a separate
mandril I may use only one mandril which would be sufficiently long to receive
both rollers. In the example four tool carriages are represented each pair of
carriages which are in line being actuated by an ordinary band wheel Z. which is
connected by means of ordinary steel tapes m with the carriages. As represented
each of the wheels 7. moves the two carriages in the pair in reverse directions 80
that when the wheel revolves in one direction the carriages approach each other
and when the wheel revolves in the other direction the carriages move apart. For
sake of illustration one pair of carriages is represented moved apart to about the
fullest extent the carriages in the other pair being in position as when brought
with their ends near to one another. By this reverse action of the carriages and
as a consequence of the tools I am enabled to reverse the patterns upon the
rollers so that such rollers are made suitable for back to back printing. When this
reversal is not required I dispense with one set of the tapes m and connect the
two carriages in a pair by means of a connecting bar or link so that they will
move in unison in the same direction. I do not confine myself to any specified
number of tool carriages nor to the exact details for imparting the described
movements to such carriages.
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. A duplex Pentagraph machine constructed to carry two rollers to be engraved
the axes of the rollers being in one straight line as set forth.
2. A duplex Pentagraph machine adapted to engrave reversed patterns upon two
rollers mounted upon one mandril or upon two coupled mandrils arranged end to
end with their axes in one common straight line the said machine having tool
carriages coupled in pairs the two carriages in a pair or in the pair moving in
reverse directions substantially as and for the purpose set forth and indicated.
Dated this 19th dev of March 1886