AN IMPROVE- MENT IN LOOMS FOR WEAVING
Year: 1853

page_text: PROVISIONAL SPECIFICATION left by Joel Livsey at the Office
of the Commissioners of Patents, with his Petition, on the
5th May 1853.
(Void by reason of notice to proceed not having been given within the
time prescribed by the Act.)
I, JOEL LIVSEY, of Bury, in the County of Lancaster, Gentleman,
do hereby declare the nature of the said Invention for "AN IMPROVE-
MENT IN LOOMS FOR WEAVING" to be as follows:-
In an arrangement of mechanism for the purpose of putting a
positive and uniform strain or tension upon the yarn during the process
of weaving, that is, to accomplish the same object which is now done
imperfectly by friction, which requires constant attention to prevent
undue strain upon the yarn, besides having other defects. The prin-
ciple upon which I accomplish the purpose of my Invention is this: I
divert the yarn coming from the beam between any two suitable points
out of the straight line, so as to form an angle or loop; and supposing
the yarn & cloth beams to be held so as not to deliver from their
respective coils or rollers, it will follow that if I apply a certain &

page_text: fixed force to the angle or loop of the yarn by any suitable means I
shall put a strain upon the yarn, & by varying that force vary the
strain or tension. Now under these circumstances, if it be assumed
that the taking up of the cloth and letting out of the yarn be equal,
the distance of the angle or loop of the yarn, measured from the two
fixed points between which it is diverted from the straight line, will
continue the same; but if there is a difference between the taking up
& letting out it will affect the length of the loop, or distance from
the fixed points to the angle of the yarn, as I suppose that angle or
loop to be formed by a constant force applied to the angle of the yarn,
which is, therefore, at liberty to change. The variations in the length
of the loop or angle of the yarn, caused by the difference between the
taking up and letting out of the yarn, I make to actuate suitable
mechanism, which shall increase or decrease the speed of letting off the
yarn, or which shall cause the yarn beam to uncoil or stop uncoiling,
according as the loop or angle of the yarn is less or greater than the
length which may be fixed upon.
The mechanism by which my Invention may be performed &
carried into effect is various. One method is as follows:-I divert the
yarn so as to form a loop or angle between two rollers, rods, or other
arrangement, placing at the angle or loop of the yarn a rod or roller,
which goes across the whole width of the yarn; to this rod I attach a
weight or weights sufficient for the strain or tension required upon the
yarn, which may be accomplished by simple weights or springs, or weights
or springs combined with levers. I arrange to drive the yarn beam by
means of a worm & wheel, or other suitable arrangement, from any
convenient. moving part of the loom, so that I can give to it a speed
a little greater than the beam is required to uncoil or unwind when it
is empty. With the worm I connect a "catch box," & with the
catch box a "tumbler or lever, & weight, which is capable of con-
necting or disconnecting the worm with the driving power; & by
suitable mechanism I connect the bar, rod, or roller in the loop with
the tumbler," so that when the loop gets shorter than the fixed length
it will cause the "tumbler" to bring the catch box in gear, & so
"

page_text: begin to uncoil the yarn from the beam; & when the loop gets too
long, by reason of the yarn being uncoiled faster than it is taken up, it
will cause the "tumbler " to put the catch box out of gear, and thus
stop the uncoiling till the loop gets shorter again, & so on, the beam
alternately uncoiling, & then stopping; or in case the yarn beam is
nade to uncoil constantly, then to increase or decrease the speed
according to the variation in the length of the loop or angle.