US741602A - Let-off motion for looms. - Google Patents

Description

PATENTED OCT. 13, 1903.

H. WIDMER.

LET-OFF MOTION FOR LOO-MS.

APPLIQATION FILED NOV. 4:, 1902.

N0 MODEL.

WITNESSES:

ATTORNEY weight or cross bar 0.

UNITED STATES Patented October is, 1903.

P TENT OFFICE.

LET -OFF MO'l'lON FOR L'OOMS.

SPECIFICATION forming part of Letters Patent No. 741,602, dated October 13, 1903.

Application filed November 4,1 902. Serial No. 180,075. (No model.)

To all whom it may concern:

Be it known that I, HEINRICH WIDMER, a citizen of the United States, residing at Union Hill, in the county of Hudson and State of New J ersey,have invented new and useful Improvements in Let-01f Motions for Looms, of which the following is a specification.

By means of this invention a take-up and let-0E can be secured adapted to insure satisfactory weaving.

This invention has been tested in connection with silk-weaving; but of course the scope of the invention is not to be thereby limited. v V r The invention resides in certain novel features of construction set forth in the following specification and claims, and illustrated in the annexed drawings, in which- Figure 1 shows a side elevation of a loom. Fig. 2 shows a rear elevation of Fig. l or, in other words, a view looking in the direction from the warp to the cloth-beam.

The loom as known comprises the warpbeam b, on which is wound warp-threads a, passingover roller 0 and carried through the heddles to be formed into sheds for the passage of the shuttle. Thefinished fabric or cloth is wound on cloth-beam *i. A certain tension or brake action on warp-beam b is secured by weight 1, whose cords or ropes 2 clasp or run about opposite end parts of said beam 1).

The parts thus far described are old and form no part of this invention.

The new parts constituting the invention are the eccentric or crank e on shaft or stud f, rotated by gear g, and driving disk or gear h. The crank e by link Z oscillates lever m m fulcrumed at n. Arm m connects with two ropes or cords 3, respectively wound, say, two or three times about a respective end of warpbeam 17 and having at their-other ends the The weight of bar 0 can be varied by applying one or more removable weights osay, ordinary scaleweights-or any other removable weight that is ready to hand. As the shed closes or the Warp-threadscome to a common plane the warp-threads slacken, and at the same time the crank 6 (shown at main shaft f) moves lever-arm m downward and arm m rises to slacken the cords or flexible connections and allow weight 0 to descend. This movement of cords 3 tends to rotate warp-beam b backward and take up the slackcaused by the warp-threads closing the shed. As the shed reopens the crank e moves the lever to swing arm 'm downward and pull cords 3 to lift weight 0 and aid the forward rotation of warp-beam 1). Excessive tension of the warpthreads in forming a shed is thus avoided. If thethreads are delicate-say, in some cases of silk-weaving -excessivestrain should be avoided, as otherwise the warp-threads may betorn.

The arrow in Fig. 1 shows the direction in which the finished cloth travels to clothbeam '5.

The word cord herein of course means.

a suitable rope or flexible connection of suitable strength and make. 7 V

In speaking .of a lever m m it is noted that, as shown, there are really two levers at opposite sides of theloom,'one lever appliance for each cord 3; but as the levers act in unison or the explanation'of one lever applies to the other the above description sets forth the operation of this invention.

In place of weights, aso or 0', a spring or springs can be applied; but a weight is preferred.

What I claim as new, and desire to secure I by Letters Patent, isa 1. The combination with the warp-beam of a loom, of means independent of the warp and actuated by the operation of the 100m for rotating said beam backward, when the shed closes, sufficiently to take up the slack in the warp-threads.

2. The combination with the warp-beam of a loom, of means independent of the warp and actuated by the operation of the loom, for roweight-bar being adapted to receive or seat removable weights foradjusting the brake action. I

4. The combination with the warp-beam of and a lever for actuating the cord and beam a 100m, of means, comprising an operatingback and forth to tighten and slacken the shaft, a lever reciprocated by said shaft, a warp, said cord'and oscillating lever being 15 cord attached at one end to said lever and exindependent of the warp. 5 tending around said warp-beam, and aweight In testimony whereof I have hereunto set attached to the end of said cord, for rotating my hand in the presence of two subscribing said beam backward, when the shed closes, witnesses.

sufficiently to take up the slack in the warpv i 7 threads; and for facilitating its forward rota- HEINRICH IDMER' 10 tion when the shed opens. Witnesses:

5. A 100m having a warp-beam, a weighted E. F. KASTENHUBER,

friction-cord made to engage the warp-beam, CHAS. E. POENSGEN.

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