Certain IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1877

page_text: LETTERS PATENT to James Lord, of Crawshaw Booth, near Rawtenstall, in
the County of Lancaster, Manufacturer, for the Invention of "Certain
IMPROVEMENTS IN LOOMS FOR WEAVING."
PROVISIONAL SPECIFICATION left by the said James Lord at the Office of
the Commissioners of Patents on the 28th March 1877.
JAMES LORD, of Crawshaw Booth, near Rawtenstall, in the County of Lancaster,
Manufacturer. "CERTAIN IMPROVEMENTS IN LOOMS FOR WEAVING."
My Invention consists in an improved combination of machinery for regulating
the tension on the warp threads from one end of the warp to the other.
To the warp beam is fixed a toothed wheel gearing into a pinion, which is cast
on a break pulley; to the axle of the vibrator is fixed a lever, which is connected
by a rod to the bottom lever, the outer end of which is drawn down by a spring or
weight; the lever on the axle of the vibrator acts upon a break lever, which when
depressed acts on the break pulley. When the tension on the warp threads is great
enough to depress the vibrator the lever fixed on its axle is lifted off, the break
lever thereby releasing the break pulley, and allowing a small portion of the warp
to be drawn off the warp beain, but the moment the warp is slackened the spring
acting on the bottom lever draws down the lever on the vibrator, and again applies
the break.
The above details may be modified.
By this means a uniform tonsion is kept up from the full warp beam until the
in aminte

page_text: My Invention consists in an improved combination of machinery for regulating
the tension on the warp threads from one end of the warp to the other.
And in order that my Invention may be fully understood and readily carried
into operation, I will proceed to describe the accompanying Sheet of Drawings, in
which Fig. 1 is a side elevation, and Fig. 2 a back view of a loom to which my
improvements are applied.
a is the warp beam, and b the vibrator, which are made as usual. To the warp
beam & is fixed the toothed wheel a³, which gears into the pinion c, attached to the
same axle as the break pulley c¹. To the axle of the vibrator b is fixed the lever b¹,
which is connected by the rod e to the bottom lever f, the outer end of which is
drawn upwards by the spring g. The lever b' on the axle of the vibrator b, acts
upon the end of the break lever d, which is hinged to a stud d' fixed to the loom
side. When the lever d is depressed it acts on the break pulley c¹. When the
tension on the warp threads is great enough to depress the vibrator b the lever b¹,
fixed on its axle, is lifted off the end of the break lever d, thereby releasing the
break pulley c¹, and allowing a small portion of the warp to be drawn off the warp
beam a, but the moment the warp is slackened the spring g, acting on the bottom
lever f, draws down the lever b¹, which acting on the end of the lever d again applies
the break.
The above details may be modified.
By this means a nearly uniform tension is kept up from the full warp beam until
the beam is empty.
When a weight is employed instead of the spring g the rod e must be connected
to the inside of the fulcrum stud of the lever f
As the tension of the spring must be sufficiently great to apply the break when
the warp beam is full, and as the said tension may be advantageously reduced as
the warp beam diminishes in diameter, it may in some cases be desirable to fix the
stud g¹ in the end of a double lever, as shewn in dotted lines in Fig. 1, the longer
arm of which is held in contact with the yarn on the warp beam by the spring g, or
otherwise. By this arrangement the stud g' would be gradually lowered as the
warp is unwound off the warp beam, and in lowering the stud g' the tension of the
spring g would be reduced to the required degree for equalising the tension on the
yarn.
Having thus stated the nature of my Invention, and described the manner of
performing the same, I wish it to be understood that I do not intend to limit myself
to the details given, and that I claim, the improved combination of machinery
shewn and described for regulating the tension of the yarn as it is let off the warp
beam.
In witness whereof, I, the said James Lord, have hereunto set my hand and
seal, this Fourteenth day of September, One thousand eight hundred and