IMPROVEMENTS IN CAP SPINNING OR TWISTING APPARATUS
Year: 1881

page_text: LETTERS PATENT to Richard Dawson and William Henry Dawson, both of
the Larchfield Mills, Hunslet, Leeds, in the County of York, Worsted.
Spinners, for an Invention of "IMPROVEMENTS IN CAP SPINNING OR TWISTING
APPARATUS.”
PROVISIONAL SPECIFICATION left by the said Richard Dawson and
William Henry Dawson at the Office of the Commissioners of Patents-on the
8th January 1881.
RICHARD DAWSON and WILLIAM HENRY DAWSON, both of the Larchfield Mills,
Hunslet, Leeds, in the County of York, Worsted Spinners. "IMPROVEMENTS IN
CAP SPINNING OR TWISTING APPARATUS."..
14
The object of our Invention is to give facility for obtaining greater speed and
less. waste of material, with increased drag on the yarn, and consequently the
production of increased solidity or quantity and better quality of yarn on the
bobbin in cap spinning or twisting, and economy of manufacture, combined with
increased durability of the caps employed.
For this purpose we form on the outer surface of the caps by means of coils of
small wire, flanges, or other projecting surfaces in rings, volutes, or otherwise round.
the cap, so as to form uneven yet smooth and highly polished projecting surfaces,
which will avoid the tendency now experienced of licking in by the attractive
character of the ordinary form of cap; or the surface of the cap may be removed
in grooves or channels spirally or otherwise to obtain a similar result, and the cap
at the upper part thereof may be formed tapered or otherwise, so as to reduce the
tendency of the thread to be attracted or licked on to the cap, and the lower end
may be formed somewhat bell mouthed. The caps are in some cases provided.
with perforations in their sides.
These caps may in some cases be formed of "toughened glass," moulded into the
desired configuration, by which a hard, tough, durable, and economical material
having a smooth highly polished surface will be secured.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Richard Dawson and William Henry Dawson in the Great Seal
Patent Office on the 5th July 1881.
<<
RICHARD DAWSON and WILLIAM HENRY DAWSON, both of the Larchfield Mills,
Hunslet, Leeds, in the County of York, Worsted Spinners. IMPROVEMENTS IN
CAP SPINNING OR TWISTING APPARATUS."
The object of our Invention is to give facility for obtaining greater speed and
less waste of material with increased solidity or quantity, and a better quality of
yarn on the bobbin in cap spinning or twisting, and economy of manufacture,
combined with increased durability of the caps employed.
For this purpose we form on the outer surface of the caps by means of coils of
small wire, flanges, or other projecting surfaces in rings, volutes, or otherwise round
the cap, so as to form uneven yet smooth and highly polished projecting surfaces,
which will avoid the tendency now experienced of licking in by the attractive
character of the ordinary form of cap; or the surface of the cap may be removed in
grooves or channels, spirally or otherwise, to obtain a similar result. The caps are
in some cases provided with perforations in their sides...
But that the Invention may be the better understood we will by the aid of the
accompanying Drawings proceed to describe means pursued by us in carrying the
same into effect.
Figure 1 represents an ordinary cap with its spindle and parts; A representing
an ordinary cap, and B its spindle, capable of being fixed at B¹ in the ordinary
way to the spindle rail; C, the bobbin, or it may be a spool which is caused to
revolve round the spindle B in the usual way by means of an endless band acting
on the wharle D¹ of the tube D; D2 indicates the lifter rail. Figure 2 represents
a cap perforated at A¹, and with a coil of wire A² secured round it, according to
our improvements, to act on the yarn under operation and prevent the licking or
attractive tendency of the plain surface of the ordinary cap, such licking or friction
having a tendency to cause the thread to break and make waste. Figure 3 shows
another arrangement of the improvements, in which the cap A is formed with a
flange As and with perforations A', if those perforations are found necessary;
Figure 4 shows a plain cap A with flange A³; Figure 5 represents a cap A; having
grooves A instead of flange or wire coil.
,
Ordinary caps have hitherto been made of cast iron or steel, or both; steel on
the lower portion being preferable on account of the finer polish or surface, thus
reducing friction upon the thread. Our improvements enable us to run at a much
higher speed and with cast iron caps with less waste, and consequently the pro-
duction of more yarn, which will be found to be of a softer and fuller or thicker
appearance. The flange and that portion of the barrel below the flange may be
made of steel.
In some cases we form these "caps of "toughened glass," which can be moulded
into any desired shape, and is strong to resist fracture; but we do not claim such
application of toughened glass as part of our Invention.

page_text: Having thus described our Invention we would have it understood that what
we claim is the manufacture of caps used in cap spinning or twisting apparatus,
substantially as described.
In witness whereof, we, the said Richard Dawson and William Henry
Dawson, have hereunto set our hands and seals, this Twenty ninth day
of June, One thousand eight hundred and eighty one.