LOOMS FOR WEAVING."
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said Isaac Bradshaw at the Office
of the Commissioners of Patents on the 30th October 1880.
ISAAC BRADSHAW, of Preston, in the County of Lancaster.
LOOMS FOR WEAVING."
"IMPROVEMENTS IN
This Invention of improvements in looms for weaving has reference to an
improved arrangement of the swell, whereby the operation of arresting the progress
of the shuttle may be more gradually and effectively performed than heretofore. As
usually arranged the arm or blade upon which the swell or curve is formed is
hinged or pivotted at one end. According to my Invention the swell or curve is
supported centrally in slot bearings, in which pins or arms, one on each side of a
central block to which the swell or curve is attached, are free to slide. The requisite
pressure is afforded through the medium of a back spring arranged to press upon
the central block, and therefore centrally of the swell. The swell fits easily within
a groove formed in the side of the shuttle box in the usual manner, and is
provided at each end with suitable stops, which not only determine the amount of
projection of the swell within the shuttle box, but also answer each in turn as
fulcra or points of resistance when the shuttle presses upon each end of the swell
respectively. By the improved arrangement of swell centrally supported, as above
described, the entire working surface of the curved portion of the swell is available
for exerting friction upon the shuttle, and a gradually increasing and effective
pressure upon the shuttle as it enters the shuttle box is afforded.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Isaac Bradshaw in the Great Seal Patent Office on the 27th April
1881.
ISAAC BRADSHAW, of Preston, in the County of Lancaster. "IMPROVEMENTS IN
LOOMS FOR WEAVING."
This Invention of improvements in looms for weaving has reference to an
improved arrangement of the swell, whereby the operation of arresting the progress
of the shuttle may be more gradually and effectively performed than heretofore.
As usually arranged the arm or blade upon which the swell or curve is formed is
hinged or pivotted at one end. According to my Invention the swell or curve is
supported centrally in slot bearings, in which pins or arms, one on each side of a
central block to which the swell or curve is attached, are free to slide. The requisite
pressure is afforded through the medium of a back spring arranged to press upon
the central block, and therefore centrally of the swell. The swell fits easily within
a groove formed in the side of the shuttle box in the usual manner, and is provided
at cach end with suitable stops, which not only determine the amount of projection
of the swell within the shuttle box, but also answer each in turn as fulcra or
points of resistance when the shuttle presses upon the opposite end of the swell.
In the accompanying Drawings, Fig. 1 is a plan, Fig. 2 a sectional plan, Fig. 3 a
side view from the interior of the shuttle box, and Fig. 4 a side view from the
exterior of the shuttle box of my improved swell for looms.
a is the swell or curve supported centrally in slotted guide bearings b, in which
the pins or arms c, c, one on each side of the central block d, are free to slide; e, the
back spring; f, the groove in the side of the shuttle box in which the swell or
curve a fits easily, and g, g, are the stops (answering as fulcra or points of
resistance), formed upon cach end of the swell.
For heavy weaving, in which a greater pressure upon the swell may be required
than can be conveniently afforded by the employment of one back spring as above
described, two such springs may be employed, the back springs being so arranged
that they may press one upon each of the stops g, g, respectively. A convenient
arrangement of two springs is shewn in Fig. 5.
By the improved arrangement of swell centrally supported, as above described,
the entire working surface of the curved portion of the swell is available for
exerting friction upon the shuttle, and a gradually increasing and effective pressure
upon the shuttle as it enters the shuttle box is afforded.
Having now described the nature of the said Invention, and explained the
manner in which the same is to be or may be carried into practical effect, I
would have it understood that what I consider to be novel and original, and
therefore claim as secured to me by the hereinbefore in part recited Letters Patent
is as follows, that is to say :-
1. The arrangement of swell centrally supported and provided with stops
answering as fulcra, substantially as described and shown in the Drawings for
the purpose specified.
2. The combination of parts constituting the improved swell for looms, constructed,
arranged, and operating substantially as herein before described and shown in the
Drawings.
In witness whereof, I, the said Isaac Bradshaw, have hereunto set my hand
and seal this Twenty-fifth day of April. in the year of our Lord One thousand