US818367A - Warp stop-motion for looms. - Google Patents

Description

No. 818,367. PATENTED APR. 1'7, 1906. N. FOERSTER.

WARP STOP MOTION FOR LOOMS.

APILIOATION FILED AUG. 4, 1905.

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INVENTOR:

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I By Zzfm neys, mq/ f $4 No. 818,867. 'PATENTED APR.1'7, 1906. N. POERSTER. WARP $TOP MOTION FOR LOOMS.

APPLICATION FILED AUG. 4, 1905.

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INVENTOR: WITNESSES! No. 818,367. PATENTED APR. 17, 1906. N. FOERSTER.

WARP STOP MOTION FOR LOOMS.

APPLICATION FILED AUG. 4, 1905.

4 SHEETS-SHEET 3 INVENTOR:

WITNESSES:

No. 818,367. PATENTED APR.17, 1906.

N. FORESTER.

WARP STOP MOTION FOR LOOMS.

APPLICATION FILED AUG. 4, 1905.

& SHEETS-SHEET 4.

INVE NTQR:

UNITE l STATES PATENT OFFICE.

WARP STOP-MOTION FOR LOOMS.

Specification of Letters Patent.

Patented April 17,1906.

Application filed August l, 1905. Serial No. 272,698.

To all whom it may concern:

Be it known that I, NORBERT FOERSTER, a citizen of the United States, residing in Passaic, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in WVarp Stop-Motions for Looms, of which the following is a specification.

This invention aims to provide a warp stop-motion which shall be of the simplest possible character and shall operate with certainty and reliability, which shall not put any great strain upon the warp-threads, and which shall not complicate the work of the weaver in repairing broken threads.

Certain other advantages are referred to in detail hereinafter.

The accompanying drawings illustrate an ordinary loom to which an embodiment of this invention is applied.

Figure 1 is a side elevation of the principal parts of the loom, the starti'ng-lever side of the loom being presented. Fig. 1 is a portion of Fig. 1 enlarged. Fig. 2 is a front elevation of a portion of Fig. 1, illustrating more clearly the operation of the shiftinglever and connected parts. Fig. 3 is a plan showing for clearness only the parts relating to this invention. Figs. 4 and 5 are diagrams in elevation and plan, respectively, illustrating the operation of the actuating devices. Fig. 6 is a view of a series of actuating devices looking at them from the front of the machine and showing certain connected parts in section. Figs. 7 and 8 are diagrams illustrating in elevation the successive positions of the parts upon breakage of a warp-thread and upon restarting of the loom. Fig. 9 is a side elevation of a supplementary drop or actuating device.

The actuating devices are pivoted so that the warp-threads support only the free ends thereof, the free end of each actuating device or lever being supported upon the crossing-point of two adjacent warp -threads which are crossed (preferably at a point between the lease-rods) for this purpose. For example, (see Figs. 4 and 5,) two adjacent threads A and B are crossed at a point between the lease-rods C and D, and resting upon the two threads at their crossing-point is the free end of a thin blade or lever E, which constitutes the actuating device controlling the mechanism for stopping theloom. In the machine illustrated the entire series of levers E is pivoted upon a rod F, running the length of the machine and constituting one terminal of an electric circuit which controls the stopping of the loom, the other terminal being a rod G, parallel with the rod F and above the same a short distance. The longer end H of the lever 1E rests upon the warp threads, and the shorter end or arm J is ar ranged to stand slightly in the back of the terminal G when the warp-threads are intact. However, if either of the warp-threads A or B breaks the heavier end H of the lever drops and presses the shorter arm J against the terminal G, completing the circuit and stopping the machine as hereinafter described. The contact might be made with a terminal in position to be engaged by the lower long arm H of the lever but by the use of a shorter arm for making the contact the pressure is greater, and consequently the contact is better. The arm J of course may lie in any direction from the pivot F. Preferably the lever E is provided with two pivot-holes K at equal distances from the opposite ends, so as to be reversible and so as to facilitate the punching of the lever, (it being easier to hold it in position in the punching-machine when there is an engagement at two points than when there is an engagement at only one point.) The levers E are very simply mounted, being threaded loosely on the rod F, so that there is practically no friction in their operation and so that they may be freely moved in one direction or the other laterally to correspond with the positions of the warp-threads.

The terminal rods F and G are mounted at their ends in suitable insulating-bushings in the frame L and are provided with bindingposts from which run wires M and N through a source of electricity (typified by the bat tery 0, Fig. 1) and through an electromagnet P. The latter is provided with an armature Q, having a long tail R, which serves to move into operative position a projecting member S, carried upon the starting-lever T. The lever T is of the usual or any suitable construction, having at its lower end a spring portion which tends to throw it always toward the frame of the machine, and being arranged to operate a transverse lever U, which shifts the belt from the fast to the loose pulley, the upper end of the lever being in a slot V, provided at its outer end with a squared recess adapted to receive the upper portion of the startinglever T and prevent the spring from throwing it toward the machine and from thereby throwing the belt to the loose pulleythat is to say, in the position of the lever in Figs; 1 to 3 the loom is in operation.

The lay is provided with a projecting portion or tappet W, which normally when the lay swings forward passes just above the top of the feeler S. When a warp thread is broken, however, and the circuit is completed through the magnet P, the armature Q is drawn down and its tail R lifted, thus lifting also the projecting member S, and at the next forward movement of the lay the tappet W strikes the feeler and pushes the shift ing-lever P out of its retaining-notch and into the long portion of the slot V, so that its spring throws it inward and shifts the belt to the loose pulley, thus stopping the loom.

When a warp-thread has broken and been repaired, it is usually a little loose at first and not adapted to support the actuating device that is to say, if the actuating device were rested upon the thread in the usual manner the thread would sag, so that the actuating device would fall, perhaps, a suflicient distance to complete the circuit and stop the loom. In order to avoid this difficulty, there is provided, preferably, a means for rendering the stop-motion inoperative until the loom has made the necessary number of strokes to take up the warp-threads. The number of strokes required for this purpose will vary from one or two with rough cotton to half a dozen strokes with silk. In some caseswith extremely rough goods, for exampleit may be that the actuating device can be supported by the warp at once, in which case of course the means for rendering the stop-motion inoperative are unnecessary. Preferably means are also provided acting to render the device operative again automatically after the loom is started and has run the desired number of strokes. For example, a rod X may be provided, running across the full width of the machine, preferably below the warp-threads, and a sufficient distance in the rear to avoid interfering with the downward movement of the actuating device when the warp breaks. (See Fig. 7.) -The rod X, however, is adapted to be shifted to a forward position, Fig. 8, in which it holds up the lower end of the lever E, so that the latter does not press with any weight upon the warp-threads and cannot swing downward to close the circuit and stop the loom. The two extreme positions of the rod X are illustrated in full and dotted lines, respectively, in Fig. 4.

After a warp-thread has broken and been repaired the weaver shifts the rod X to its forward position, holding up all the levers E. The weaver then throws the starting-leverT over to the position for operating the loom, and after a few turns, when the repaired warp thread has been drawn sufficiently tightly to support the weight of its lever E, the rod X is shifted back again to its inoperative position.

A suitable mechanism for obtaining the desired operation is illustrated in Figs. 1 and 3. The rod X constitutes the u per horizontal cross-bar of a frame provide with a parallel lower cross-bar or pivot Y and an upri ht Y at each side, one of which is extended to form a hand-lever Z, by means of which the frame can be rocked backward and forward on its lower pivotal shaft Y and the rod X can be moved from one to the other of its two positions. In order to lock the rod X in its operativethat is to say, its forwardposi tion, a spiral s ring a presses the entire frame, compose of the parts X, Y, Y, and Z, toward the lower end of Fig. 3. At the same time the spring a has a spiral strain tending (as does the weight of the parts) to throw the lever Z to the right in Fig. 1that is to say, to throw the rod X to its rearmost or inoperative position. The spring a cooperates with a locking arm b on the shaft Y, which projects under the cam-shaft c of the loom, and which in turn is controlled bya threaded collar d on the cam-shaft 1 Normally'the spring a by its spiral effect holds the arm I) up against the under side of the cam-shaft c. When the lever Z is thrown forward, the arm I) is thrown down sufficiently to escape the threads d, and the spring a moves the whole frame laterally until the arm I) strikes against the enlargement e at the end of the screw-thread. By reason of the diameter of the threaded sleeve d the arm I) cannot move upward, and the rod X is held in its forward position. The end of the arm I) enters between the threads on the sleeve 01. Now when the loom is started the cam-shaft revolves in such a direction that the threads on the sleeve (1 gradually force the arm 1) side-- wise against the pressure of the spring at until the end of the thread is reached, when the arm I) springs upward until it strikes the under side of the cam-shaft, this upward movement throwing the rod X to its backward inoperative position. During the movement of the arm I) from one end to the other of the screw thread the warp threads are sufiiciently tightened to support the actuating devices. A greater or less delay in the withdrawal of the rod X and the resetting of the actuating devices may be secured by prolong ing or shortening the screw-threads of the sleeve d. For example, if it is desired to make six picks with the stop-motion inoperative the thread will be given three revolutions, (since the cam-shaft revolves at half the speed of the lay-shaft.) Preferably provision is made for breaking the circuit as soon as the loom is stopped, so as to save wasting current and so as to permit the feeler S'to restore the armature Q to its uppermost position by the weight of the feeler on the tail R of the armature. The breaking of the current when the loom stops also saves the weaver from receiving an electric shock in the readjustment of the actuatingdevices to the restored warp. For example, there may be in terposed in the circuit for this purpose a pair of terminals f g, Fig. 1*, which are pressed together by the lever T during the running of the loom, but which when the lever T is thrown back into the long portion of its slot V spring apart and break the circuit. The supporting of the levers E from a point above their centers tends to maintain them automatically in proper vertical planes and to prevent them from working toward one side or the other.

Certain of the features of the above-described actuating devices may be applied to a supplementary actuating device E, Fig. 9, which has the additional advantage that it may be used with one or with two warpthreads. For this reason it is peculiarly valuable as a supplementary actuating device, Where in the location of the regular actuating devices E across the warp a single thread is accidentally omitted. Supposing A to be such a thread, the supplementary device E is dropped over the rod F by means of the oblique slot f and the extra thread A is passed through the notch g, so as to support the weight of the lower end of the actuating de vice or to drop such lower end when such thread breaks. The notched lever E may therefore be used in combination with the levers E to correct errors in the setting of the latter upon the warp, or the notched levers may be used exclusively, the facility for setting them in place compensating to a great extent for their liability to displacement, (which can be reduced to a minimum by making the notches f and g of considerable length,) and they may be used for two threads by making their lower ends plainthat is, omitting the notch g.

Though I have described with great particularity of detail certain specific embodiments of the invention, yet it is not to be understood therefrom that the invention is limited to the specific embodiments described. Various modifications thereof in detail and in the arrangement and combination of the parts may be made by those skilled in the art without departure from the invention.

What I claim is 1. A warp -stop motion, in combination with means for rendering it inoperative to stop the loom, and means for rendering it operative again automatically after the loom has run a determined distance.

2. A warp -stop I motion, in combination with means for rendering it inoperative, said means including a series of levers each supported upon a crossingpoint of two warpthreads, a shiftable rod X for relieving the threads of the weight of said levers, means for locking said rod X in its operative position, and means for returning said rod to its operative position automatically after the loom has run a determined distance.

3. A warp-stop motion, in combination with means for rendering it inoperative, said means including a series of levers each sup ported upon a crossing-point of two warpthreads, a shiftable rod X for relieving the threads of the weightof said levers, an arm 1) moving with said rod X and engaged in the normal running of the loom with the camshaft c, a sleeve 01 on said cam-shaft provided with a screw-thread, and a spring a for shifting the rod X longitudinally when the arm I) is moved beyond the diameter of the sleeve d, whereby theend of the arm b engages the beginning of the screw-thread and is gradu ally shifted back to its original position by the rotation of the cam-shaft after the loom is started.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

NORBERT FOERSTER. Witnesses:

DOMINGO A. USINA, THEODORE T. SNELL.

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