IMPROVEMENTS IN APPARATUS FOR REGULATING THE TENSION OF THE WARP IN LOOMS
Year: 1877

page_text: LETTERS PATENT to John Clayton Mewburn, of 169, Fleet Street, in the City.
of London, Patent Agent and Consulting Engineer, for the Invention of
IMPROVEMENTS IN APPARATUS FOR REGULATING THE TENSION OF THE WARP
IN LOOMS." A communication from abroad by Alfred Laridoy, Gras 'Potin,
and Adolphe Gand, all of Paris, France.
"E
Sealed the 27th October 1877, and dated the 14th June 1877.
PROVISIONAL SPECIFICATION left by the said John Clayton Mewburn at
the Office of the Commissioners of Patents on the 14th June 1877.
JOHN CLAYTON MEWBURN, of 169, Fleet Street, in the City of London, Patent.
Agent and Consulting Engineer. "IMPROVEMENTS IN APPARATUS FOR REGULATING⚫
THE TENSION OF THE WARP IN LOOMS." [A communication from abroad by Alfred
Laridoy, Gras Potin, and Adolphe Gand, all of Paris, France.]
The apparatus which forms the subject of the present Invention is intended to
automatically regulate the tension of the warp in looms by compensating in propor-
tion to the unwinding of the warp from the beam for the continuous diminution of
the diameter of this beam as well as for the influence of the temperature and
humidity of the atmosphere on the threads.
The apparatus is constructed as follows:-Upon one of the end plates of the warp
beam, or on the spindle of this beam, a projection or tappet is fixed, which, at every
turn of the beam, gives an oscillation to a lever which rests against the said spindle..
This lever carries a paul which actuates a vertical ratchet wheel keyed on the end
of a screw which imparts motion to a nut. This travelling nut is carried and
guided by a frame, and in its rectilinear movement tends to more and more stretch
a coiled spring attached to the said frame, and which possesses. an initial tension.
regulated when the loom is put into work. The other end of the spring is attached
to a cord, chain, or band, which turns a two-grooved pulley.. In the second groove
of this pulley another cord is attached, which pulls on the spindle of a vertical
endless screw, and always tends to make it descend in the same manner as a rack
would act upon a wheel keyed on the warp beam.
.
The endless screw carries at its upper end a horizontal ratchet wheel, upon the
teeth of which acts a paul on a lever, which receives its motion at every movement

page_text: of the batten of the loom through the intermediation of a coiled spring and of two
cords, which are attached respectively to the two grooves of a two-grooved pulley.
Thus each movement of the batten corresponds with the advance to the extent of
several teeth of the horizontal ratchet wheel, and therefore to a partial rotation of
the endless screw, which, gearing with a wheel having helicoidal teeth and pulled
by the action of the first-mentioned coiled spring, as herein-before explained,
descends opposite the spindle of the warp beam.
The spindle of the beam carries a wheel with pins arranged horizontally around
its periphery, which pins take into and drive the pins or teeth of a star or sprocket
wheel keyed on a screw, which works in a fixed nut. This screw, which is at first
completely screwed into the nut, issues therefrom by degrees, gradually limiting by
its extremity the travel of the lever (which is herein-before described as receiving
its motion at every movement of the batten) in accordance with the progressive
diminution of the diameter of the warp beam. The travel of this lever increasing,
the result is a greater amplitude for the rotation of the horizontal ratchet wheel,
and therefore of the endless screw, so that the general equilibrium is always
re-established and the tension of the warp constantly regulated by the first-nained
coiled spring.
The lever last above referred to is guided in its oscillating movement by a piece
which is fixed to the fixed nut above mentioned. The mechanism consisting of the
wheel with horizontal pins, the star wheel, the screw which takes into the fixed
nut, and the second coiled spring, thus compensate for the diminution of the diameter
of the warp beam, while the regulation of the tension of the warp is in reality
effected by the mechanism which acts on the first-named coiled spring.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed!
by the said John Clayton Mewburn in the Great Seal Patent Office on the
27th November 1877.
JOHN CLAYTON MEWBURN, of 169, Fleet Street, in the City of London, Patent
Agent and Consulting Engineer. "IMPROVEMENTS IN APPARATUS FOR REGULATING
THE TENSION OF THE WARP IN LOOMS." (A communication from abroad by Alfred
Laridoy, Gras Potin, and Adolphe Gand, all of Paris, France.)
The apparatus which forms the subject of the present Invention is intended to
automatically regulate the tension of the warp in looms by compensating in propor-
tion to the unwinding of the warp from the beam for the continuous diminution of
the diameter of this beam as well as for the influence of the temperature and
humidity of the atmosphere on the threads.
The improved apparatus is represented in front elevation in Figure 1, in plan in
Figure 2, and in side elevation in Figure 3 of the annexed Drawings, and is
constructed as follows:-Upon one of the end plates P of the warp beam E, or on
the spindle of this beam, there is a projection or tappet, the height of which can be
regulated, and which, at every turn of the beam, gives an oscillation to a lever a,
an oscillation which is regulated by varying the height of the tappet b which rests
against the said spindle. The lever a carries a paul c which actuates a ratchet
wheel R, making it advance several teeth at every revolution of the beam. This
ratchet wheel is keyed on the end of a screw & which imparts motion to a nut f in
the direction of the arrow. This nut is carried and guided by a frame g, and in its