US1730018A - Warp stop motion for looms - Google Patents

Description

Oct 1, 1929. G. H. SHUTT 1,730,018

WARP STOP MOTION FOR LOOMS Filed March 26. 1927 Patented Get. 1, 1929 UtT E T tFt GEC'RGE H. SHUTT, OF NEV BEDFORD, MASSACHUSETTS, ASSIGNOR TO CROMETON & KNGWLES LOOM VIORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF IMASSACHUSETTS WAR]? STGP MOTION FOR LOOIVIS Application filed March 26,

This invention relates to improvements in means for stopping the loom should two or more warp threads be stuck together as they approach the lease rod.

In weaving the warp is usually wound on a beam rotatably supported at the rear of the loom and extends upwardly over guides for directing the warp toward the harnesses where they are separated for the laying of the weft. In certain classes of warps it is necessary to provide some means for separating adjacent warp threads, as they are found to stick together from various causes, such as the sizing used on cotton warps or attractions due to static electricity resulting from the movement of the harnesses. If the warp threads stick together tightly the lease rod will ordinarily break the threads and reliance must be had upon the warp stop motion to prevent the weaving of imperfect cloth. It is an important object of my present invention to provide a light rod normally held toward the beam and movable toward the harnesses when engaged by a group of matted warp threads to effect loom stoppage through the warp stop motion.

It is a further object of my invention to combine a light rod with a warp stop motion in such a way that an ordinary drop wire may be employed to stop the loom through the slackness of flexible connections between a fixed art of the loom and the rod.

With these and other objects which will appear as the description proceeds, my invention relates to the arrangements and combinations of parts hereinafter set forth, and more particularly pointed out in the claims.

In the accompanying drawings, wherein a convenient embodiment of my invention is shown:

Fig. 1 is a central vertical transverse section through a loom having my invention ap plied thereto,

Fig. 2 isv a fragmentary top plan view of a 59 Fig. 4 is a view similar to Fig. 3 but with portion of a loom taken in the direction of 1927. Serial No. 178,770.

the stop rod moved forwardly by improper sticking of adjacent warp threads and with the warp stop motion moved to effect stoppage of'the loom, and

Fig. 5 is an enlarged detail vertical section on line 55 of Fig. 2 showing how a group of warp threads act to move the stop rod.

Referring to the drawings the loom frame 10 supports a warp beam 11 advance movement of which may be resisted by a weight to lever 12 and a friction band 13 trained around a drum 14 and anchored to a fixed point as at 15. The warp W which is wound on the beam may be led upwardly and over a whip roll 16 and then forwardly to the bar ness mechanism, not shown, at which point the warps are separated to form the various sheds.

The loom is provided with a warp stop motion and for the sake of illustrationT have set forth'a motion of the type shown in patent to Regan No. 1,365,112 but any other form of warp stop motion may be used. The bottom shaft 20 has secured thereto a cam 21 which cooperates with a cam lever 22 pivoted 7 to the loom frame as at 23 and attached at the rear end thereof to an upwardly extending rod 24. Said rod is connected to a lever 25 which at the time of warp fault will be operatively connected to a forwardly extending push rod 26. The latter is connected to a shipper lever 27 and brake lever 28 and is effective when moved forwardly to throw the power off the loom and to apply the brake, if the loom be provided with a brake. The warp stop motion includes non-circular oscillating detector bars 29, two being shown' in the drawings, and said bars oscillate about their axes when the lever 25 is rocked. A

set of drop wires 30 is provided for each of terruption but when any drop wire falls due to breakage or slackness of the corresponding warp thread oscillation of the associated bar will be prevented and at such a time the forwardly extending rod 26 will be moved to stop the loom. Fixed relatively heavy sep- 10a arator bars 31 are provided to assist in preventing angular movement of the drop wires when the latter falls into contact with the bars 29. F or a further understanding of the connections between the rods 24 and 26 and the means for oscillating the detector bars 29, reference may be had to Patent No. 1,360,638 to Holmes. The warp stop motion set forth herein is merely illustrative and it is to be understood that any form of motion for stopping the loom at warp fault may be employed.

It is common practice when weaving certain classes of goods to employ so-called lease rods which separate the warp threads, alternate threads passing over the bar and the intervening or intermediate threads passing under the bar. The purpose of this construction is to separate adjacent threads so they may pass freely to their respective heddles or other harness connect-ions. A lease rod 35 is shown in the drawings as located between the lease rod and the warp stop motion. Straps 36, one of which is shown in the drawings, are provided to limit forward movement of the lease rod. The matter thus far described is old and forms no part of my present invention.

In carrying my improvement into effect I provide a light rod 40 and locate the same between the whip roll and lease rod and also between the separated planes of warp threads. Said rod may be made ofany suitable material, as iron or wood, and is held in rearward position by cords and weights 41 and 42 respectively, one set of these elements being shown in the drawings. Rear-ward movement of the rod 40 is limited by light cords 43 which are attached to said rod and extend forwardly and are secured to the forward separator bar 31, only one of said cords 43 being shown in the drawings. I further employ an auxiliary detector or drop wire 44 formed substantially as shown in Fig. 3 or similar to the wires used for the warp stop motion proper. The auxiliary drop wire straddles the cord 43 to be held clear of the corresponding detector bar 29 under normal conditions. Said cord 48 may be somewhat stronger than the ordinary warp threads so as to be able to support the weights 42, but it will be sufliciently flexible to permit the auxiliary drop wire 44 to drop when said cord is slack.

Under normal operation the warp WV will.

move forwardly from the beam over the whip roll toward the lease rod and will be sepa rated by the latter so as to be free to pass'to the heddles or harness mechanism. The bottom shaft will cause reciprocation of rod 24 and consequent oscillation of detector bars 29. The weights 42 will hold the stop rod 40 rearwardly in the position shown in Fi 8 so that thecords 43 will support each drop wire 44. When a group of warp threads which are stuck together so tightly as not to be readily separated reaches the stop rod 40, they will move the latter forwardly to cause slackness of one or the other of the cords 43 as indicated in Fig. 5. One of the drop wires 44 or both of them, will thereupon fall to arrest oscillation of the associated detector bar 29, as shown in Fig. 4, and the forwardly extending rod 26 will be given a loom stop: ping movement as set forth in the aforesaid patent to Holmes. In this way the weaver can separate the warp threads which are clinging together and thus prevent their breakage. I have found from actual experience that a number of looms equipped with the device such as set forth herein operate satisfactorily to stop the loom when warp threads are not properly separated by the lease rods. If one auxiliary drop wire 44 is found to be too light, two or more may be used until sufficient weight is resting on the cord 43.

From the foregoing it will be seen that I have provided a very simple means for step ping the loom when several warp threads stick together and resist the separating action of the lease rod, and it will further be seen that this result is achieved through the use of ordinary drop wires such as form part of the ordinary equipment of a warp stop motion, the device acting upon slackness of the cords 43 to permit the drop wire to fall and thus stop the loom.

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention, and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In stopping mechanism for looms, a warp stop motion including spaced substantially horizontally aligned parallel separator bars extending across the loom, an oscillating de tector rod forming part of the warp stop motion, a stop rodlocated between the warp threads to be engaged and moved forwardly by a group of threads improperly connected together, a flexible element secured to one of the separator bars and extending rearwardly and connected to the stop rod, weighted means to hold the flexible elementtaut and the stop rod in normal position, and a drop wire having a slot supported by the flexible element, said drop wire to move into stopping relationship with the detector rod when the element becomes slack due to forward movement of the stop rod, said weighted means being supported by one of the separator bars through the flexible element independently of the drop wire, said detector rod extending througha slot in thedrop wire.

2. In stopping mechanism for looms, a warp stop motion including spaced substantially horizontally aligned parallel separator bars extending across the loom, an oscillating detector rod forming part of the warp stop motion, a stop rod located between the warp threads to be engaged and moved forwardly by a group of threads improperly connected together, a flexible element secured to one of the separator bars and extending rearwardly and connected to the stop rod, weighted means to hold the flexible element taut and the stop rod in normal position, and a drop wire having a slot supported by the flexible element, said drop wire to move into stopping relationship with the detector rod when the element becomes. slack due to forward movement of the stop rod, said weighted means being supported by one of the separator bars through the flexible element independently of the drop wire and said detector rod extending through a slot in the drop wire.

3. In a stopping mechanism for looms having a warp stop motion, a whip roll, a lease rod to separate the warp into two planes and being held from movement toward the warp stop motion and mounted intermediate the warp stop motion and the whip roll, a supply of Warp passing over the whip roll and toward the warp stop motion, a normally stationary but movable auxiliary rod lying between the planes of warp and independent of the lease rod, a flexible device having one end held to a fixed part of the loom, said device being attached to the auxiliary rod, means to hold the device taut under normal conditions and a second means to stop the loom when the auxiliary rod is moved with respect to the warp stop motion by a group of connected warp threads.

4:. In a stopping mechanism for a loom having a warp stop motion, a whip roll, a supply of warp passing over the whip roll and toward the warp stop motion, a lease rod held from movement toward the stop motion and separating the warp threads into two planes, an element located between the planes of the warp threads and capable of moving toward the warp stop motion, a flexible device having one end fixed to a stationary part of the loom, said device being connected to the element, yielding means to hold the device normally taut, and means to stop the loom when the element is moved toward the warp stop motion, said element being independent of the lease rod and moving between the planes of warp when engaged by improperly separated warp threads.

In testimony whereof I have hereunto affixed my signature.

GEORGE H. SHUTT.

Images