IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1876

page_text: LETTERS PATENT to George Hopwood, of Blackburn, in the County of Lan-
caster, Manufacturor, for the Invention of " IMPROVEMENTS IN LOOMS FOR
WEAVING."
Sealed the 29th June 1877, and dated the 30th December 1876.
PROVISIONAL SPECIFICATION left by the said George Hopwood at the Office
of the Commissioners of Patents on the 30th December 1876.
GEORGE HOPWOOD, of Blackburn, in the County of Lancaster, Manufacturer.
"IMPROVEMENTS IN LOOMS FOR WEAVING."
This Invention relates to the weighting motion of the yarn beam of the loom,
and consists in an improved mode of keeping the yarn at a uniform tension at all
diameters of the beam, as the yarn is wound off, in a more efficient and economical
manner than has hitherto been attained.
I place the ends of the beam in semicircular friction bearings provided with
frictional caps, the bearings having at the bottom small centres and stops for
regulating the oscillations, and the bearings work on brackets bolted to the frame-
work, the brackets being made so that they can be adapted to different lengths of
beams, and raised or lowered as required.
To the ends of the inner part of the cap I fix arms connected by rods to the
ordinary back spring, to which the ordinary ropes have hitherto been attached.
To the ends of the back part of the cap I fix other arms having holes for adjust-
ment, the arms being connected by rods to the ordinary rails or levers carrying the
weights, and I have found by experience that the friction on the beam is constant
and holds the yarn at a uniform tension, and requires no supervision of skilled
workmen after the parts have been adjusted, and at the same time the ropes and
chains, and the pins or spikes hitherto used, are entirely dispensed with.

page_text: This Invention relates to the weighting motion of the yarn beam of the loom,
and consists in an improved mode of keeping the yarn at a uniform tension at all
diameters of the beam, as the yarn is wound off, in a more efficient and economical
manner than has hitherto been attained.
I place the ends of the beam in semicircular friction bearings provided with
frictional caps, the bearing having at the bottom small edges or centres and stops
for regulating the oscillation, and the bearings work on brackets bolted, to the
framework, the brackets being made so that they can be adapted to different lengths
of beams, and raised or lowered as required.
In one arrangement I fix or cast arins to the ends of the inner parts of the caps
and connect the arms by rods to the ordinary back spring, to which the weighting
ropes or chains are attached, there being at the tops of the rods screws and nuts to
regulate the amount of oscillation required; and to the ends of the back part of
one cap I cast or fix other arms having adjusting notches or holes, the arms being
connected by rods to the ordinary rails or levers carrying the weights.
In another arrangement, instead of attaching the rods with their adjusting screws
and nuts to the back. spring, I link them to projections or brackets, and also instead
of attaching the ends of the back arms to the rails or levers carrying weights I
connect them to springs.
I
On the accompanying Sheet of Drawings Figs. 1, 2, and 3 are end views
representing the application of my improved weighting motion to looms, and in all
the Figures the yarn beam is represented at a, the semicircular bearing and caps
at b, c, the arms fixed or cast to the caps at d, e, the edges or centres of the
bearings at f, and the stops at g. In Fig. 1 the front or inner arms e are linked
by rods k to the ordinary back spring 1, there being at the top of the rods screws m
for adjusting the length of the rods according to the tension required, and the back
arms & are connected by rods n to the weighting levers o carrying weights p, and
when desired I dispense entirely with the ordinary back springs, and simply link.
the rod k to projections on brackets q, Fig. 2, in which Figure I represent one mode
of applying springs for weighting the beam, instead of employing the usual levers
and weights. To the back armis d are linked one end of springs r, the other ends
of which are bolted to the stationary back rails of the loom, and the front arms
are linked by the rods to stationary projections or brackets q, there being at the tops
of the springs and rods screws and nuts m for regulating the tension. In Fig. 3 I
employ two springs u, v, at each end of the yarn beam, instead of the weights and
levers, and also the back rods, both pairs of springs being bolted to the back rail
and linked to the back and front arms d, e, and provided with adjusting screws and
nuts m.
In all these improved arrangements of weighting motions the friction on the
yarn beam is constant and holds the yarn at a uniform tension, and therefore
requires no supervision of skilled workinen after the parts have been adjusted, and
in all cases the pins or spikes at the ends of the beam and the ordinary ropes or
chains are entirely dispensed with, and when springs are used the levers and weights
are not required.
Having now described the nature and particulars of my said Invention, I desire it.
to be understood that I claim the improved arrangements of weighting motions for
looms used in weaving, as herein described and illustrated on the accompanying
Sheet of Drawings.
In witness whereof, I, the said George Hopwood, have hereunto set my hand
and seal, this Twenty-seventh day of June, in the year of our Lord One
thousand eight hundred and seventy-seven.