US2342752A - Warp stop motion - Google Patents

Description

0. v. PAYNE WARP STOP MOTION Filed Dec. 26, 1941 Feb. 29, 1944.

2 She ets-Sheet 1 INVENTOR O SCAR \IC'P RYME'.

ATTORNEY Feb. 29, 1944. o. v. PAYNE WARP STOP MOTION Filed Dec. 26, 1941 2 Sheets-Sheet 2 FIE-- 5, 7 1 m m n a I 5 u W 4, n n n m A 2 a W 5 mu m I m M .2 6 l r0 m" n q 7 5% u 3 I mmmrw a? I m M M IP 4 4 I a m "M n m & ii 2 7 3 A. J 3 rL 7 7 I. L a n m 1 q u n n: 8, 1 h .I I. I. III I 5 FIE-j FIG. 4

INVENTOR Oscaa \l. PAYNE.

QAM/A ATTORNEY Patented Feb. 29, 1944 UNITED STATES PATENT orrlce l WARP STOP MOTION 7 Oscar V. Payne, Leicester, Mass., assignor to Crompton & Knowles Loom Works, Worcester,

Mass, a corporation of Massachusetts Application December 26, 1941, Serial No. 424,492

12 Claims. (o1; 139-358) I v This invention relates to improvements in warp stop motions for looms and it is the general object of the invention to provide means by which parts of the mechanism can be made readily adjustable for changing conditions of weaving.

Warp stop mechanisms customarily employ drop wires which are guided and held apart in banks by separator bars. The latter determine the elevation of the warp threads and therefore the height of the drop wires with respect to the detector bars. Heretofore difficulty has been experienced in adjusting the separator bar s relatively to the detector bars, and any given warpstop mechanism required a drop wire designed specifically for it. It is an important object-army present invention to provide means which afford a delicate adjustment for the vertical position of the separator bars with respect to the detector bars so that the best operating conditions for any given drop wire can be attained, and also to permit the use of various types of drop wires. 1

Where several banks of drop wires are used it y is customary to employ relatively high front and back separator bars and low intermediate bars. Where the warp is under considerable tension the low intermediate bars do not interfere with the operation of the drop wires, but when the warp is slack, or when certain decorative warp threads become slack, the corresponding drop wires'between the intermediate bars sag and are likely to give a false indication. In order to overcome :this difficulty it has been necessary heretofore to remove the low intermediate bars and replace them with high bars of the same size as the front and back bars. It is a further object of my present invention so to shape the intermediate bars that their upper surfaces can be either in low or high position as determined by requirements of the fabric being woven. This result I attain by making the intermediate bars invertible and thus permit one set of bars to perform the function heretofore attainable only by the use of two sets of intermediate bars. 1 a 7 Where the warp stop mechanism is of the electrical type it is necessary to provide some connection between the insulated electrodes of the contact bars and the loom controlling circuit. Such connections have heretofore been provided but have always required some form ofmanipulation with the aid of tools at the loom. It is a further object of my present invention to provide a quickly attachable member made of elastic material such as rubber and having a contact eleslipped. over the end of a contact bar to cause the contact element to engage the insulated electrode of thebar.

With these and other objects in View which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth. a In the accompanying drawings, wherein a convenient embodiment of my invention is set forth, Fig. 1 is a vertical section through awarpstop' mechanism made according to my present invention taken longitudinally of the warp threads-and looking toward one of the loomsides, I

Fig. 2 is a rear elevation looking in the direction of arrow 2, Fig. l, l

Fig. 3 is a detailed verticalsection on line .-l3 of Fig. 2,

Fig.4 is a vertical section on line 4-4. of Fig. 3, Fig. 5 is avertical section on line 5--5 of Fig. '1 showing the intermediate bars in low position,

Fig. 6 is a view similar. toa portion .ofJFig. 5 but with the intermediate bars shown inverted and in high position, Fig. 7 is a group diagrammatic view showing the relation of the adjacent ends of the end and intermediate separator bars, and I Fig. 8 is a perspective viewof one of the supporting units. if a The structure shown in the drawings, -except the contact members for the contact bars, is duplicated on each side of the loom. A description will be given of the mechanism at one-side only with the understanding that it appliesto both ends of the loom. Referring to-Figs. l and 2, the loom frame It supports a bearing ll having a hub 12 which receives a-vertical gudgeon 53 of a support M. A horizontal threadedbar I5 is held in longitudinally adjusted position on the support I4 by means of set screws I6 and extends rearwardly parallel-to the warp threads W. I I

Strung along the bar 15 is a series of separate holding units as indicated in Fig. 1. Front and back units 20 and 2| are engaged by lock nuts 22 and 23, respectively, and other units 25 similar to each other are located between the front and back units. As shown particularly in Fig. 1 unit 20 has a head 26 and a lateral slot 21 to receive the front separator or warpsupp orting bar 28. The rear unit 2| is formed without a slot corresponding to slot 21 but has a vertical front wall 30 which-extends along the rear separator bar 3|. Bars 28 and-3| are relatively high and' the warpextends along their upper. edges.

Each of the intermediate units 25 hasa head 33 and a slot 34 at the-rear face-thereof similar to slot 21 and has a front wall 35 for engagement with the separator bars 40 located in the slots 34. The unit 25 immediately to the left of the front unit 20 as seen in Fig. 1 holds the front bar 28 in position in slot 21 and the slot 34 in the rear face of the rearmost unit 25 cooperates with the previously described wall 30 to hold the rear separator bar 3| in position. The intermediate separator bars 40 are located in their respective slots 34 and held in position by the rear walls 35 behind them formed on the units 25.

These separator bars are spaced as indicated in Fig. 1 to receive drop wires one of which is indicated at D in ,Fig. 1. Each drop wire has a closed slot 4| the upper end of which is wedge shaped as at 42 and is further provided with an eye 43 at the upper end of an open slot 44 in the bottom of the wire. A warp thread passes through each eye 43 and contact bars 45 pass through the slots 4|. Each contact bar is provided with a body 46 in electrical contact with the heads of the various units as indicated in Fig. l and an insulated electrode 41 for each bar 46 is out of electrical contact with the latter but positioned for engagement with the upper wedge shaped part of the drop wire when the latter is in low or stopping position. The heads 26 and 33 hold the contact bars in position above and intermediate the separator bars.

Except as indicated hereinafter the mechanism thus far described may be of the same general form as that set forth in my prior Patent No. 1,852,024.

In carrying my present invention into effect I provide means for raising all of the separator bars simultaneously so that their upper surfaces may be varied to raise or lower the warp threads. In carrying this feature of my invention into eifect I provide the front and back units 20 and 2| with cylindrical bores 50 and respectively, in each of which is located a cylinder or barrel 52. The barrels are connected by a longitudinally extending rod 53 which extends through an opening 55 formed in the lower part of each intermediate unit 25. The axis of the rod is eccentric with respect to the axes of the barrels and its rear end is bent laterally as at 51 to form a handle extending behind the rear unit 2| to be accessible to the operator. A set screw 58 in the lower part of unit 2| is provided to hold the barrels in their angularly adjusted position. It is to be understood that the rod 53 is secured to each of the barrels and with the latter forms a unit which is rotated on the front and back units 20 and 2| to vary the elevation of the rod with respect to the contact bars 45.

The front and back separator bars 28 and 3| have their ends reduced as at 60 to project through their corresponding slots and rest on the rod 53. In a similar manner each intermediate separator bar 40 has its end reduced as at 6| to project through the associated slot and rests on the rod 53.

As shown in Fig. 2 the rod 53 is in its lowest position so that the separator bars are at their maximum distance below the contact bars 45. After the mechanism has been attached to its supports as already described by securement of the gudgeon |3 in the hub |2 by set screw H, the nuts 22 and 23 will be loosened and the handle 51 manipulated to rock the barrels in their bearings, thereby raising the rod 53 until the desired nicety of adjustment between the contact bars and the separator bars is attained, after which set screw 58 and the lock nuts .22 and 23 are tightened. In this way I am able to vary the elevation of the separator bars so that they may have proper relation with respect to the contact bars.

Another feature of my invention relates to the invertibility of the intermediate bars 40 so that their vertical position with respect to the front and back bars 28 and 3| can be altered. In carrying this feature of my invention into effect I form the reduced extended ends 6|) of the front and back separator bars as indicated in Fig. 5, and at A, Fig. 7, to be central with respect to the top and bottom edges of the bars. By this construction the front and back bars can be placed in position without reference to which of their warp supporting edges is up. The reduced portion 6| of each intermediate bar 43, however, is offset from one edge as indicated in Fig. 6, and at B and C, Fig. 7. When bars 40 are in the low positions shown in Fig. 1 their extensions are relatively high, as indicated at B, Fig. 7, the edge 65 resting on rod 53 being between the upper and lower edges 55 and 61, respectively, and below edge 66 which is continuous along the reduced end 6|.

When a tight warp is being woven and it is desired to offer as little frictional resistance to the threads as possible on the part of the separator bars, the intermediate bars will be in the low position shown in Fig. l and at A, Fig. '7 with their edges 66 below the tops of bars 28 and 3|. When slack warp is being woven, however, the intermediate bars will be inverted from the position of Fig. 5 to that of Fig. 6 and the extended edges 66 will rest on the rod 53 as shown at C, Fig. 7. In this latter position the tops of all the separator bars are in substantially the same horizontal plane and will contact and support the warp threads so that even though the latter are slack the drop wires will be held in proper position above the insulating electrodes 41. It will be obvious that whether the intermediate bars are in the position shown in Fig. 5 or Fig. 6 they will be moved with the front and back bars when adjustment is made by the eccentric mounting of rod 53 already described.

By reference to Figs. 1 and 2 it will be seen that the heads of the various units and the supporting bolt l5 cooperate to align the bores 5| through which the rod 53 extends. Considering the intermediate units 25, for instance, each is formed with a horizontal surface on which rests the overhanging part 8| of the head 33 so that the vertical position of adjacent units is determined by the engagement of the head of one unit with the surface 80 of an adjacent unit. A bore 83 of each unit receives the supporting member l5 and serves to align the units horizontally and the features just described cooperate to align the bores 5| through which the rod 53 passes. These bores 5| are sufficiently large to permit the rod 53 to swing through the arc suggested for instance in Fig. 2.

That part of my invention thus far described is equally applicable to mechanical or electrical warp stop motions and although I have shown an electrical contact bar to cooperate with a fallen drop wire I do not wish necessarily thus to be limited. When the electrical form of bar is used it is desirable to provide means to connect it to the external loom controlling circuit and this I may accomplish by the form of contact member shown in Figs. 2, 3 and 4:. As shown in Fig. 2 the contact bars extend to the left of the organized supporting unit for the separator bars and the insulated electrodes 41 project upwardly for engagement with'a. typerof contact now to" strip is pointed downwardly as indicated, at 90 to have contact with the insulated electrode 41, and the strip is connected as at 9| to the wire 11. The right end of cavity 78, as, seen in Fig. 4, is further provided with apocket 82 to receive the adjacent end of the contact strip 19. A large recess 93 receives the adjacent end of contact bar 45 and the contact member 1'5 is held in place by its own resilience.

In assembling the contact head the wire 11 will first be passed through the recess 93 into cavity 18 and then down through the bore 16, carrying with it at its trailing end the strip 19 the left end of which will be extended into the left end of pocket 18. Because of the elasticity of the material of which thehead is made, the upper right corner thereof will then be bent upwardly and twisted on itself to permit pocket 82 to receive the right hand end of the strip 19. When released the head resumes its normal position indicated in Fig. 4 to hold the contact strip in position and the bar 45 is then slipped endwise into the recess 93 to cause engagement between the insulated electrode 41 and the down-turned point 98 of the contact strip 19.

The bars 45 are grounded by their engagement with the units supported on the threaded bar l5, and the contact electrodes 41 are connected to wires 11, only one of which is shown in the drawings, to an external loom controlling circuit. My prior patents, Nos. 1,852,024; 1,873,147 and 1,873,465 may be referred to for an understandin of how the loom may be stopped when wire 11 is connected to the body 46 of the contact bar by a fallen drop wire.

From the foregoing it will be seen that I have provided simple means for varying the position of the separator bars including the eccentrically mounted rod 53 which can be turned by means of handle 51 to effect a delicate adjustment of the separator bars with respect to the contact bars. It will also be seen that the intermediate bars are made with reduced extended ends so shaped that in one position the bars are low and out of contact with the warp threads and when in inverted position are relatively high to support slack warps. Furthermore, it will be seen that I have provided a simple form of contact head made of soft elastic material such as rubber which can be readily applied to the ends of the contact bars 45 without the use of tools. Itwill also be seen that adjacent units have engaging parts which cooperate with the supporting bolt l to align the bores 5| through which the lifter rod 53 extends. The invertible intermediate bars shown particularly in Figs. 4 and 5, and the contact members for the ends of the contact bars shown in Figs. 3 and 4 are not claimed herein but are made the subject matter of divisional applications, Serial Nos. 443,886 and 443,887, respectively, both filed on May 21, 1942.

Having thus described my invention it will be seen 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 thedetails herein disclosed, but what I claim is:

.1. In a warp stop mechanism having a" structure supporting a detector bar and atsepa rator bar below the detector bar to determine the level of the warp which supports a' drop wire'forthe detector bar, means on the fixed structure to guide the separator bar for vertical motion,

and a rotary element in the fixed structure engaging the separator bar and rotatable to'raise' and lower the separator bar to vary thev distance between said bars.

2. In a warp stop mechanism structure supporting a detector bar and a separator bar below the detector bar to determine the level of the warp which supports a drop wire for the detector bar, means'on said fixed structure providing vertical guides for the separator bar, and a rotatable element eccentrically mounted on the fixed structure and supporting'the separator bar and rotatable to raise and lower the separator bar to vary the distance between said bars. y

3. In a warp stopmechanism having a fixed structure supporting a detector bar and a separator bar below the detector bar to determine the level of the warp which supports a drop wire for the detector bar, means on said fixed support providing vertical guides for the separator bar, a rod extending under and having supporting relation with respect to the separator bar, and an eccentric mounting for said rod carried by the fixed structure, angularzmotion of the eccentric causing said rod to raise and lower the separator bar 49 for the detector bar, means on said fixed support providing a vertical guide for one of said bars, and a rotatable support for said one bar having a portion engaging said bar at a point eccentric with respect to the axis of the support, rotation of said support causing said portion to move the bar thereon vertically to vary the distance between said bars.

5. In a warp stop mechanism having a fixed structure supporting a detector bar and a sepa rator bar below the detector bar to determine the level of the warp which supports a drop wire for the detector bar, means on said fixed structure to provide vertical guides for one of said bars, and means mounted on said fixed structure and in engagement with said one bar and movable relatively to the fixed support to Vary the vertical distance between said bars.

6. In a warp stop mechanism to cooperate with drop wires of different heights and having a fixed structure supporting a detector bar and a separator bar below the detector bar to determine the level of the warp which supports a drop wire for the detector bar, a support for one of said bars mounted on and movable with respect to a fixed structure and capable of varying the elevation of said one bar by movement with respect to said fixed structure to vary the vertical distance between said bars.

7. In a warp stop mechanism to cooperate with drop wires of varying heights, a fixed structure, a detector bar mounted on the structure to cooperate with a drop wire, a separator bar to determine the elevation of the warp which supports the drop wire, and means mounted on and. movable with respect to the fixed structure to having a fixed vary the vertical position of one of said bars to alter the vertical distance between said bars and adapt them for cooperation with drop wires of different heights.

8. A bar supporting unit for a warp stop mechanism having an elongated support and a separator bar, said unit comprising a body with: an abutting surface and a head extending upwardly from said surface and projecting horizontally beyond the body to engage and be positioned by the abutting surface of an adjoining similar unit, said body having extending therethrough a bore to receive the elongated support and having a second bore parallel to and below the first bore to receive a supporting member for the sepa= rator bar.

9.- A bar supporting unit for a warp stop mechanism having an elongated support and a separator bar, said unit comprising a body withan abutting surface and ahead extending upwardly from said surface and projecting horizontally beyond the body to engage and be positioned by the abutting surface of an adjoining similar unit, said body having extending therethrough a bore to'receive the elongated support having a second bore parallel to and below the first bore to receive a supporting member for the separator bar, said body having a guide surface for the separator bar below said head and through which the second named bore extends.

10. A bar supporting unit for a Warp stop mechanism having an elongated support and a separator bar said unit comprising a body having a flat horizontal surface and a head pro jecting upwardly from said surface and beyond the body to engage a similar surface on an adjacent unit by which the head and body is positioned vertically, said body having a bore etc-'- tending therethrough to receive the elongated support to cause said unit to be positioned horizontally by the support with respect to an ad jacent unit, and said body having a second bore parallel to the first named bore torec'eive a sup porting member for the separator bar.

11. In a warp stop mechanism having an elo'ngated support and separator bars extending transversely of the support, a plurality of sepa'-' rator bar supporting units having aligning bores therethrough to receive the support, each unit having a head to extend over and engage a surface of an adjacent unit, each unit having a second bore therethrough, the heads' and surfaces in engagement therewith" cooperating with the support to hold the second named bores in alignment, and a member extending through said

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