IMPROVEMENTS IN PENTAGRAPH ENGRAVING MACHINES to be as follows:
Year: 1884

page_text: I, JOHN ADAM, 70 Polmadie Road, Glasgow, in the County of Lanark, North
Britain, Pentagraph Engraver, do hereby declare the nature of my said invention
for "IMPROVEMENTS IN PENTAGRAPH ENGRAVING MACHINES to be as follows:-
"
My said Invention has for its object by adapting to a pentagraph engraving
machine a simple and convenient adjustable contrivance, to save time and specially
skilled labor required with ordinary machines for preparing patterns of certain.
kinds for what is known as "slashing." When the dosign contains lines parallel to
the printing roller which is to be engraved, the pattern as prepared for the
pentagraph engraving machine is ordinarily modified from the design so that such
lines may have a slight angle in order to obviate the risk of the edge of the
"doctor" catching in such lines. My improvements aro more especially applicable
to pentagraph engraving machines of the kind known as Rigby's and having a
concave table on which is placed the pattern for the tracer of the machine to pass
The tracer is attached to a carriage running upon a horizontal bar which
is connected by two pendent arms fixed on a shaft above, this shaft having on it
wheels for supporting and turning the roller which is being engraved.
over.
In carrying out my Invention I make the lower parts of the pendent arms in
separate pieces and attach these separate pieces to the upper parts by means of
slotted flanges and screw bolts. Ou slackening these bolts the lower parts of the
arms can be adjusted one outwards and the other inwards so as to set the horizontal
bar at a suitable slight angle; and when the horizontal bar is set at such angle an
ordinary "square" pattern can be used whilst the obliquity of the bar will cause:
such lines as would ordinarily be parallel to the roller to be engraved thereon with,
the desired slight inclination.
.
EDMUND HUNT,
Applicant's Agent.

page_text: 1, JOHN ADAM, 70 Polmadie Road, Glasgow, in the County of Lanark, North
Britain, Pentagraph Engraver, do hereby declare the nature of my said invention
for "IMPROVEMENTS IN PENTAGRAPH ENGRAVING MACHINES" and in what inanner
the same is to be performed, to be particularly described and ascertained in and
by the following statement, that is to say :-
My said Invention has for its object by adapting to a pentagraph engraving
machine a simple and convenient adjustable contrivance, to save time and specially
skilled labor required with ordinary machines for preparing patterns of certain
kinds for what is known as "slashing." When the design contains lines parallel to
the printing roller which is to be engraved, the pattern as prepared for the
pentagraph engraving machine is ordinarily modified from the design so that such
lines may have a slight angle in order to obviate the risk of the edge of the
doctor" catching in such lines. My improvements are more especially applicable
to pentagraph engraving machines of the kind known as Rigby's and having a
concave table on which is placed the pattern for the tracer of the machine to pass
over. The tracer is attached to a carriage running upon a horizontal bar which is
connected by two pendent arms fixed on a shaft above, this shaft having on it
wheels for supporting and turning the roller which is being engraved.
"
And in order that my said Invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings
showing my improved devices and the parts to which they are immediately.
attached.
"
Figure, 1, is a front elevation showing the horizontal bar, A, above referred to,
also the pendent arms, B, and the shaft, C, Figure, 2, 3, and 4, are enlarged views
of details.
In carrying out my Invention I make the lower parts, D, of the pendent arms, B,
in separate pieces, and I attach these separate pieces, D, to the upper parts, B, by
means of slotted flanges, E, formed on the upper parts, B, and screw bolts, F, passed
through the slots of the flanges, E, and through flanges, G, formed on the lower
parts, D. To render the connections firm a plate, H, is interposed between the
head of each bolt, F, and the top of the flange E, this plate bearing on the flange
along the sides of the slot. On slackening these bolts, F, the lower parts, D, of the
arms can be adjusted one outwards and the other inwards so as to set the horizontal
bar, A, at a suitable slight angle; and when the horizontal bar, A, is set at such
angle an ordinary "square" pattern can be used, whilst the obliquity of the bar
will cause such lines as would ordinarily be parallel to the roller, to be engraved
thereon with the desired slight inclination.
The bar, A, is attached to the lower arm parts. D. in the same way as it is
ordinarily attached to the lower ends of the pendent arms (B) themselves; and the
pulleys, I, for the steel bands connected to the tracer carriage are also mounted on
the parts, D, in the manner usual in mounting them on the pendent arms
themselves.
In order that the adjustment of the lower parts, D, may be effected with nicety,
each part is made with a lateral extension, J, of its flange, G, in which there is

page_text: fixed a stud having a head, K, screw-tapped for a screw spindle, L. This screw
spindle is held in the head of another stud, M, fixed in an extension, N, of the
flange, E, of the pendent arm, B, and can be turned by means of a winged head. O.
When the bolts, F, fixing the lower parts, D, to the pendent arms, B, are slackened
the parts can be accurately adjusted in relation to each other by means of the screw
spindles, L, and when the adjustment has been effected the bolts, F, may be
tightened up.
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
Making pentagraph engraving machines of the Rigby type with adjustablo parts
for holding and giving obliquity to the bar carrying the tracer carriage sub-
stantially in the manner and for the purposes hereinbefore described.
EDMUND HUNT,
Applicant's Agent.