IMPROVEMENTS IN COVERING DRAWING ROLLERS USED IN MACHINERY FOR PREPARING AND SPINNING COTTON AND OTHER FIBROUS SUBSTANCES
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by John Chadwick at the Office of
the Commissioners of Patents, with his Petition, on the 22nd
.
December 1875.
I, JOHN CHADWICK, of Manchester, in the County of Lancaster, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
COVERING DRAWING ROLLERS USED IN MACHINERY FOR PREPARING AND SPINNING
COTTON AND OTHER FIBROUS SUBSTANCES," to be as follows:-
:
The Invention relates to an improved method of covering such rollers
with india-rubber.
The objections to india-rubber covered rollers as hitherto applied have
been, firstly, that the metal roller had to be reduced in diameter, so as
to form a neck or recess for holding the tube of india-rubber, and
_secondly, the latter was always made from a strip of sheet india-rubber
of the thickness required, with the edges joined together either by a "lap
joint" or a "but joint" so as to form a tube. In the first case a ridge
was formed by the joint, and in the latter case the joint was liable to
give way, and either to leave a hollow place or to come altogether.
asunder.
MT

page_text: .
sort known as “red rubber" being preferred), the said sheet rubber being
coiled several times (say five to six) round the maundril until a solid
tube of india-rubber is formed of such a thickness that when stretched
to the required diameter to cover the roller, the thickness of the rubber
shall be equal to that of the felt and leather usually employed. Thus I
obtain a solid tube of india-rubber without joint. This I then proceed
to vulcanize, using wrappers of fine "jacconet" to produce a very smooth
surface. This tube is then cut into even lengths of about one inch and
a half, and applied to the rollers in the following manner :-I use an
apparatus somewhat resembling that ordinarily employed for stretching
and placing the leather covers on rollers consisting of a tube or cylinder
of thin metal about three inches long, and of such a diameter that the
roller to be covered will pass through it. To one edge or end of this
cylinder are fixed a number of long thin blades or springs of steel, so
arranged that they form as it were a conical continuation of the cylinder,
their free ends meeting (or nearly so) at the apex of the cone, say,
about five or six inches from the edge or end of the cylinder to which
they are affixed. Over the ends of these blades or springs I slip one of
the short tubular pieces of rubber formed as above described, I then
take a metal roller precisely as used for covering with felt and leather in
the ordinary way (that is with a projecting boss having rounded
shoulders), and I pass this roller into the other end of the cylinder, and
by means of a ram or piston I force it forwards inside the blades or
springs, expanding the same, and causing them to expand the india-
rubber tube which was previously placed thereon. As soon as one
shoulder of the boss projects beyond the ends of the blades or springs I
slip the india-rubber tube on to it, and still forcing on the roller the
latter emerges from the ends of the blades with the india-rubber covering
'firmly fitted thereon. It is then ready for use and will be found much
more durable and less liable to injury than the leather or india-rubber
covered rollers hitherto employed, and the ends of the india-rubber tube
shrinking tightly over the rounded shoulders of the metal roller will
hold the india-rubber firmly in its place, so that no cement will be
required.
.