IMPROVEMENTS IN MACHINERY OR APPARATUS FOR FINISHING PRINTED SHEETS OF PAPER
Year: 1876

page_text: LETTERS PATENT to George Duncan, of Liverpool, in the County of Lancaster,
Engineer, for the Invention of "IMPROVEMENTS IN MACHINERY OR APPARATUS
FOR FINISHING PRINTED SHEETS OF PAPER."
Sealed the 21st July 1876, and dated the 14th February 1876.
PROVISIONAL SPECIFICATION left by the said George Duncan at the Office
of the Commissioners of Patents on the 14th February 1876.
GEORGE DUNCAN, of Liverpool, in the County of Lancaster, Engineer. " IMPROVE-
MENTS IN MACHINERY OR APPARATUS FOR FINISHING PRINTED SHEETS OF PAPER."
This Invention relates to machinery or apparatus for finishing printed sheets of
paper or other material in which the said printed sheets are passed through
between and in direct contact with rotating smooth set-off rolls, and is similar to
the machinery or apparatus for which British Letters Patent were granted to
James Morris under the serial numbers 1746 of the year 1868, and 1728 of the
year 1872; and consists,―
First. As improved means for giving a uniform coating of whiting or other
powdery substance to the set-off rolls in employing one or more rotating sieves
carrying the said whiting or other powdery substance. Motion is given to the
said sieve or sieves by preference from the gear of the said machinery or apparatus.
Second. As improved means for cleaning the ink set off and whiting or other
powdery substance from the set-off rolls, and for keeping the said rolls clean, in
giving a combined rotating and longitudinal reciprocating motion to the buffing or
like rolls. The rotary motion is given by any convenient gearing or means, and
the longitudinal reciprocating motion by a diamond thread, cam, eccentric lever, or
other suitable means.
Third. As improved means for delivering the printed sheets from the machine
and preventing the said sheets from travelling round with the set-off rolls on the
delivery side in employing a knife edge or guiding piece or pieces, preferably one
for the top and one for the bottom roll, so adjusted and secured close to the said
rolls that the sheets of paper shall not pass between the said knife edges and the
rolls, and are thereby caused to travel forward to the delivery table.
The above machinery or apparatus is also applicable to webs or long lengths of
paper.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by.
the said George Duncan in the Great Seal Patent Office on the 10th August
1876.
ct
IMPROVE-
GEORGE DUNCAN, of Liverpool, in the County of Lancaster, Engineer.
MENTS IN MACHINERY OR APPARATUS FOR FINISHING PRINTED SHEETS OF PAPER."
This Invention relates to machinery or apparatus for finishing printed sheets of
paper or other material in which the said printed sheets are passed through between
and in direct contact with rotating smooth set-off rolls, and is similar to the
machinery or apparatus for which British Letters Patent were granted to James
Morris under the serial numbers 1746 of the year 1868, and 1728 of the year 1872;
and consists,
First. As improved means for giving a uniform coating of whiting or other
powdery substance to the set-off rolls in employing one or more rotating sieves
carrying the said whiting or other powdery substance. Motion is given to the said
sieve or sieves by preference from the gear of the said machinery or apparatus.
Second. As improved means for cleaning the ink set off and whiting or other
powdery substance from the set-off rolls, and for keeping the said rolls clean, in
giving a combined rotating and longitudinal reciprocating motion to the buffing or
like rolls. The rotary motion is given by any convenient gearing or means, and
the longitudinal reciprocating motion by a diamond thread, cam, eccentric, lever, or
other suitable means.
Third. As improved means for delivering the printed sheets from the machine
and preventing the said sheets from travelling round with the set-off rolls on the
delivery side in employing a knife edge or guiding piece or pieces, preferably one
for the top and one for the bottom roll, so adjusted and secured close to the said
rolls that the sheets of paper shall not pass between the said knife edges and the
rolls, and are thereby caused to travel forward to the delivery table.
The above machinery or apparatus is also applicable to webs or long lengths of
paper.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a front view; Fig. 2, a sectional elevation; and Figs. 3 and 4, end views
of machinery or apparatus constructed under my Invention.
a is the framework; b, driving gear; c, calendering or set-off rolls heated by
steam through pipes d; e, e¹, travelling bands or aprous for carrying the printed
sheets to and conveying them away from the calendering or set off rolls. Instead
of bands or aprons tables may be used. f are sieves formed of perforated metal
surrounded by wire gauze containing each a second wire gauze sieve g for holding
the whiting or powdery substance, see Fig. 5; the sieves f rest at one end on
rollers h, and at the other on toothed wheels i; the toothed wheels i are driven
by the ratchet wheels j and thereby give an intermittent rotary motion to the
sieves f; the whiting or other powdery substance is thus evenly distributed to the
buffing rolls which carry the said whiting or powdery substance to the set-off
rolls c.
The buffing rolls receive rotary motion from the shaft and pulley m through
the endless chain or band n. Longitudinal reciprocating motion is at the same
time given to the said rolls by means of the grooved cams o and pins p. 9 are
brushes for cleaning the buffing rolls.
Knife edge guiding pieces are secured and adjusted close to the top and bottom
set-off rolls as to prevent the printed sheets of paper from sticking to and being
carried round with the said set-off rolls. The said printed sheets after passing
through the set-off rolls are thus caused to travel forward to the delivery apron or
table. Sometimes one knife edge guide piece is sufficient.
Having now described and ascertained the nature of the said Invention so that
others will be enabled to carry my improvements into effect, I would have it under-

page_text: stood that I do not confine myself to constructing, arranging, and driving the
various parts of the machinery or apparatus for finishing printed sheets of paper in
the manner above described; but what I do claim is,-
First. Employing in machinery or apparatus for finishing printed sheets of paper
one or more sieves caused to rotate for the purposes set forth.
Second. In giving to buffing or like rolls employed in machinery or apparatus
for finishing printed sheets of paper a combined rotating and longitudinal recipro-
cating motion for the purposes set forth.
Third. Employing in machines for finishing printed sheets of paper a knife edge
guiding piece or pieces, arranged substantially as and for the purposes set forth.
In witness whereof, I, the said George Duncan, have hereunto set my hand
and seal, the Twenty-fifth day of July, in the year of our Lord One
thousand eight hundred and seventy-six.
GEORGE DUNCAN. (L.S.)