IMPROVEMENTS IN AND RELATING TO THE LET-OFF MOTIONS OF LOOMS FOR WEAVING
Year: 1885

page_text: for weaving.
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of my invention for "IMPROVEMENTS IN AND RELATING TO THE LET-OFF MOTIONS
OF LOOMS FOR WEAVING ' and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :—
"
This invention relates to looms, and more particularly to that class of looms
designed for weaving double pile fabrics, that is to say, fabrics composed of two
parallel webs connected by intermediate warp-threads, which, when severed, form
upon each of the two webs an independent or surface pile. One feature of my
said invention may, however, be applied to looms designed for the production of
single fabrics.
The object of the said invention is to automatically relieve the warp from the
too great tension which frequently occurs in the operation of weaving.
In the accompanying drawing,
"
Figure 1 is a vertical longitudinal section on the line x, x, Figure 2 of those
portions of a loom more immediately concerned in the application of my said
invention.
Figure 2 is a front view illustrating the construction and operation of the parts.
Figure 3 is a view corresponding to figure 1, but taken on the line y, y, of
Figure 2, and
Figure 4 is a view, drawn to an enlarged scale, of certain parts of the apparatus.
The drawing shews a loom designed for the simultaneous production of two
parallel webs or fabrics such as are included in what is herein before designated as
a double pile fabric.
-
A is one warp and B is the other. The warp A passes from the usual roller C,
over the idler roller D, thence downward and underneath the loaded roller E,
which is suspended in the loop of the warp, thence upward over the idler roller F,
thence downward under the idler roller or bar G, and thence in the direction of
the headed arrow to the lay of the loom, to which it is drawn and where it is
operated in the usual manner and by the usual mechanism. This arrangement of
י”.

page_text: the warp A, including the location of the loaded roller E in the loop thereof, is
substantially the same as that existing in the ordinary loom.
H is a lever pivotted at one end, as shown at a, while the opposite end is
provided with a strap b, which passes downward around the loaded roller E.
Extended from the pivotted end of the lever H, around the adjacent end of the
roller C is a friction strap or brake I, the opposite end of which is attached to the
lever H, more or less adjacent to the free or swinging end of the said lever as
indicated at c. When, as ordinarily occurs, undue tension is exerted upon the
warp A, the loop of the said warp is shortened, thereby lifting the loaded roller E;
it, therefore, follows that the upward movement of the said roller gives a corre-
sponding movement to the free end of the lever H, and, consequently, lessens the
pressure or frictional contact of the strap or brake I upon the roller C, thereby
enabling said roller to yield and rotate more readily to the strain exerted thereon
by the draft on the warp. Conversely it follows. that, when the undue tension
upon the warp has been by this means released, the downward movement of the
loaded roller E, and the loop of the warp will depress the free end of the lever H,
and, in a proportionate degree, apply with increased pressure the strap or brake to
the roller C, so that, by this means, the tension of the warp is rendered self-
regulating; and that, inasmuch as the roller, C, turns more readily whenever the
tension is in any degree increased and less readily when such tension is diminished,
by this means a uniform tension to the warp is secured.
.
The warp B, starting from the roller J, passes over the idler roller e, thence
downward underneath the second loaded roller K, thence upward over the idler
rollers or bars f, g, thence downward under the similar roller or bar h, and thence
in the direction of the unheaded arrow in Figure 1 to the lay of the loom.
The loaded roller K is connected by a strap b¹ with the end of a lever h¹, which
in its turn is provided with a friction strap or brake J, which passes around the
roller J, for operation in the same manner that the strap or brake I is operated
with reference to the roller C. In other words, the tension-regulating mechanism,
provided as described to control the tension of the warp A, is duplicated to control
that of the warp B, so that by the said means both of the said warps are easily
controlled. not only to a uniform tension for each, but to a tension uniform in
relation with each other.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
First. Broadly, the combination, with the duplicate loaded rollers E and k placed
respectively in the loops of the warps A, B, of the duplicate levers h¹, connected
with the said rollers, the duplicate friction straps or brakes I, and the rollers from
which the said warps A, B, are primarily drawn, substantially as, and for the
purpose, herein set forth.
Second. Specifically, the arrangement of the loaded roller E placed in the loop of
the warp A, the roller C, from which said warp is primarily drawn, the lever H,
and the friction strap or brake I, the said lever being connected with the said
loaded roller and the said brake being provided to act upon the roller C, as, and
for the purpose, herein set forth.