CERTAIN IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1870

page_text: PROVISIONAL SPECIFICATION left by George Steward Hazlehurst at
the Office of the Commissioners of Patents, with his Petition, on
the 27th August 1870.
I, GEORGE STEWARD HAZLEHURST, of Manchester, in the County of
Lancaster, do hereby declare the nature of my said Invention for
"CERTAIN IMPROVEMENTS IN LOOMS FOR WEAVING," to be as follows:-
The Invention is designed for the purpose of regulating and maintaining
at one uniform tension the warp threads of looms as they are delivered
from the warp beam by self-acting means. The usual method adopted
for adjusting the tension of the warps as the warp beam becomes.
reduced in diameter is for the operative or attendant to go behind the
loom and move the weights by hand as often as it may seem necessary.
upon the levers towards their "fulcra" during the time the yarn is.
being delivered from the beam, the uncertainty and inaccuracy of tension
thus given is the object for which the present Invention is designed to.
overcome.
The improvement consists in a novel arrangement and adaptation of
mechanism that will regulate and maintain the same degree and quality
of tension to the warp throughout their whole length whilst being

page_text: delivered from the beam with mechanical precision, which may be
described as follows:-The adaptation of the improved mechanism is
applied to and in connection with the warp beam and is actuated as the
beam revolves whilst delivering yarn therefrom to give or transmit a
self-acting sliding motion to the ordinary weights, the arrangement of
which may be thus described :-The outside flange of the beam is pro-
vided with a graduated circular projection or "swell," the surface of
which forms an incline that is designed to act upon one end of a bell-
crank lever the fulcrum of which is secured to the loom frame; the
opposite end of this lever is provided with a pawl that takes into the
teeth of a ratchet wheel, upon the axis of which the ends of two
cords are attached, the opposite ends of which are connected to the
weights on the levers giving tension to the warps, these weights
are arranged to slide upon their respective levers. The action of the
several parts by the following description of their action will now readily
be understood. The full beam when placed in its bearings on the
loom is caused as the yarn is delivered therefrom to revolve, the action
of which causes the inclined swell upon the face of its flange to force
out one end of the bell-crank lever, which causes the other end to give
through the medium of its pawl a partial revolution to the ratchet
wheel after which the lever is relieved from the swell and brought by
a spring or weight back to its former position; the repeated action thus
given to the ratchet with each revolution of the beam causes its axis
to have continually folded upon it a corresponding amount of cord,
connecting the weights therewith, which gradually as the beam reduces
in diameter, diminishes the distance between the weights on the levers
and their fulcra, thus reducing the weight upon the yarn with mechanical
precision thereby maintaining a uniform tension during the time the
warps are being delivered throughout their whole length from a full to
an empty beam.