IMPROVEMENTS IN THE CONSTRUCTION OF MACHINERY OR APPARATUS FOR ENGRAVING ROLLERS
Year: 1880

page_text: LETTERS PATENT to Edward Thomas Gadd, of Salford, in the County of
Lancaster, for an Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF
MACHINERY OR APPARATUS FOR ENGRAVING ROLLERS."
PROVISIONAL SPECIFICATION left by the said Edward Thomas Gadd at
the Office of the Commissioners of Patents on the 31st July 1880.
"IMPROVE
EDWARD THOMAS GADD, of Salford, in the County of Lancaster.
MENTS IN THE CONSTRUCTION OF MACHINERY OR APPARATUS FOR ENGRAVING
ROLLERS."
This Invention relates to the engraving of copper rollers, such as are employed
in printing calicoes and other fabrics, and consists of an improved appliance to be
adapted to an ordinary or other engraving machine to effect the accurate "marking
on of the design.
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This Invention dispenses entirely with the "bumping-on" of the pattern in
sections as heretofore, and the mill is continuous in its action during the whole
revolution of the roller.
The Invention consists in the employment of a series of toothed wheels to gear
the "mill" and the copper roller together, so proportioned that the surface speed
of their peripheries shall exactly correspond.
By the use of this arrangement all tendency for the "mill" to over-run its
work is avoided, and the process of "bumping-on "the pattern in sections as at
present practised is rendered unnecessary.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Thomas Gadd in the Great Seal Patent Office on the 29th
January 1881.
EDWARD THOMAS GADD, of Salford, in the County of Lancaster.
"IMPROVE-
MENTS IN THE CONSTRUCTION OF MACHINERY OR APPARATUS FOR ENGRAVING
ROLLERS."
This Invention relates to the engraving of copper rollers, such as are employed
in printing calicoes and other fabrics, and consists of an improved appliance to be

page_text: adapted to an ordinary or other engraving machine to effect the accurate “marking
on of the design.
"
This Invention dispenses entirely with "bumping on "of the pattern in sections
as heretofore, and the "mill" is continuous in its action during the whole revolution
of the roller.
The Invention consists in the employment of a series of toothed wheels to gear
the "mill" and the copper roller together, so proportioned that the surface speed
of their peripheries shall exactly correspond.
By the use of this arrangement all tendency for the "mill" to over.run its work
is avoided, and the process of "bumping-on" the pattern in sections as at present
practised is rendered unnecessary.
Such being the nature and object of my said Invention I will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect, and in order that the same may be clearly understood
I have annexed hereunto a Sheet of Drawings illustrative thereof, and have marked
the same with Figures and letters of reference corresponding with those in the
following explanation thereof :-
Fig. 1 in the annexed Drawing represents an end elevation.
Fig. 2 a front view, and Fig. 3 a plan view of so much of an ordinary "mill"
engraving machine as is necessary to illustrate the application of my Invention
thereto.
a, a, is the framing of the machine; b, b, the copper roller, and c, c, the " mill."
Near one end of the shaft d, d, which carries the copper roller b, b, is keyed a
spur wheel e, e, gearing into a similar wheel f, f, keyed on the back shaft g, g,
near the centre of which latter is keyed a spur pinion h, h, gearing, by means of
two carrier wheels i, i, with a spur wheel k, k, which drives a small pinion l, l, on
the axle of the "mill" c, c.
It will be evident that by thus driving the "mill" by a positive motion instead
of merely by its own contact with the copper roller as hitherto the work will be
performed with much greater accuracy than heretofore, and by changing the
proportions of the wheels to correspond with the relative diameter of the roller and
the "mill" the machine can readily be so adjusted that the surface speeds of their
peripheries shall exactly correspond.
Having now described the nature and object of my said Invention, together
with the manner in which the same is to be or may be performed or carried into
practical effect, I would remark that although for the sake of illustration I have
shown a particular arrangement of spur wheels for gearing the copper roller and
the "mill" together, I do not wish to confine myself to that particular arrangement,
but I claim as my Invention, connecting the copper roller and the "mill" together
by means of toothed gearing in such a way that the surface speeds of their
peripheries shall exactly correspond, substantially in the manner and for the
purposes herein before more particularly set forth.
In witness whereof, I, the said Edward Thomas Gadd, have hereunto set my
hand and seal, this Twenty seventh day of January, in the year of our
Lord One thousand eight hundred and eighty one.
EDWARD THOMAS GADD. (L.S.)