US2551189A - Thread control for weft replenishing looms - Google Patents

Description

May 1, 1951 w. H. WAKEFIELD THREAD CONTROLFOR WEFT REPLENISHING LOOMS 2 Sheets-Sheet 1 Filed Feb. 1, 1947 FIG'.6

INVENTOR WALTER. H. WAKEFIELD wing Ma v ATTORNEY FiGQB y 1951 w. H. WAKEFIELD 2,551,189

THREAD CONTROL FOR WEFT REPLENISHING LOOMS Filed Feb. 1, 1947 2 Sheets-Sheet 2 l2 ll 5: 62

QINVENTOR WALTER H. WAKEFIELD ATTORNEY Patented May 1, 1951 THREAD CONTROL FOR WEFT REPLENISHING LOOMS Walter. H. Wakefield, Worcester, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application February 1, 1947, Serial No. 725,883

-8 Claims. (01. 139-256) This invention relates to weft replenishing looms and it is the general object of the invention to separate two threads which lead to different removing devices but are matted together subsequent to cutting at the cloth selvage.

In weft replenishing looms two threads ordinarily remain attached to the selvage incident to each weft replenishing operation. In order to take these threads from the loom it has been proposed heretofore that they be acted upon by removing means, one for one thread and another for the other thread. When the threads are smooth they do not stick to each other when out at the selvage and each can be drawn into its remover without interference by the other. When the threads are coarse and rough, however, there is likelihood that they will be matted together subsequent to selvage cutting, in which event it is found that both threads are drawn toward one of the removers. When this happens there is likelihood that one of the threads will extend into both removers and neither of the latter will be able to remove it.

One of the removing means already referred to may be a pneumatic tube spaced a short distance from the cloth and into which extends the thread corresponding to the outgoing bobbin. The other removing means may be a pneumatic thread holder much farther from the cloth and into which extends the'thread of the incoming bobbin. This latter thread is likely to be drawn into the remover when previously known thread controls are employed.

It is an important object of the present invention to control the second thread in such manner that it cannot enter the remover of the other thread. The two threads are not ordinarily stuck together Very firmly and can be separated by the joint action of the removers and a guide or the like for the second thread. This guide is preferably though not necessarily nearer to the point of selvage cutting than to the re- -mover for the first thread.

As set forth hereinafter two different means may be employed for acting on the second thread, or the one leading to the thread holder. One of these means includes a stationary hook,

and the other has a thread placer on the lay. -When the stationary hook is used the thread corresponding to the incoming bobbin is cast over it and remains hooked thereon until selvage cutting. When the placer on the lay is used it engages the second thread at a point which will be nearer the selvage cutter than to the remover. In either form of the invention the aforesaid distance relationship will prevent the matted parts of the thread from reaching the remover.

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. r

In the accompanying drawings, wherein two forms of my invention are set forth,

Fig. 1 is a plan view partly in section showing the preferred form of the invention with threads leading respectively to a pneumatic thread remover and a pneumatic thread holder prior to selvage cutting, V I r Fig. 2 is a side elevation partly in section looking in the direction of arrow 2, Fig. 1,

Fig. 3 is an enlarged view of'part of the structure shown in the lower part of Fig. 2,

Fig. 4 is a front elevation looking in the direction of arrow 4, Fig. 3,

Fig. 5 is a plan view looking in the direction of arrow 5, Fig. 3, parts being broken away,

Figs. 6, 'l and 8 are diagrammatic views showing operation of the preferred form of the invention,

Fig. 9 is a view similar to Fig. 1 but showin the modified form of the invention, 1

Fig. 10 is an enlarged side elevation looking-in the direction of arrow llLFig. 9, and I Figs. 11-14 are diagrammatic views showing the operation of the modified form of the invention.

Referring to Figs. 1 and 2, there is shown a .loom frame lflhavin a breast beam ll over which extends the cloth 0., A temple l2 on the 'breast beam is provided with a temple cutter l3 for. cutting threads close to the cloth selvage. The lay L is provided with a shuttle box IS the front wall l6 of which is slotted as at I! to receive a thread cutter l8- for cooperation with the shuttle S when the latter is in box I5 on weft replenishing beats of the loom. I y

The reserve bobbin magazine M may be of the rocking type and is mounted on a pivot pin 20 carried by a stationary support 2|. The magazine includes in its construction a transferrer arm 22 pivoted on stud 23 and normally in the raised position shown in Fig.2.

A pneumatic thread remover R comprisesta tube 25 having an intake mouthlB at the lower end thereof. A thread deflecting plate 21 on the remover ,is attached to a forwardly extending rod 28 slidably mounted in a carrier 29- mounted for pivotal movement about stud axis 23. Rod 28 3 is normally held yieldingly in rear position by a spring 30.

A stud 32 on the transferrer arm overhangs a finger 33 on the carrier 29, and a friction spring 34 holds the carrier 29 in any position to which it is moved. A resetting rod 35 has a vertically reciprocating movement and rises ordinarily dur ing backward movement of the lay to effect lift-'- lng of the remover R should the latter be down.

The upper part of tube 25 is connected to a" hose or air conduit 3! connecting with a source of subatmospheric pressures not shown. source is also connected to a thread holder designated at H having an intake'inoutli 38 for weft ends not shown extending toward the holder from the magazine. A thread collector 39 connects pneumatically with intake mouth 38v and has a mass of yarn Y therein.

In the operation of the matter thus far described a depleted shuttle entering shuttle box l5 will be replenished by a full bobbin drawn in known manner from the magazine. During the replenishing operation the empty bobbin is expelled out of the shuttle and leaves a thread T which is severed by the cutter I8. This thread extends between the shuttle and the wall I6 and leads to the selvage of cloth C. At the same time descent of the transferrer arm 22 causes stud 32 to rock carrier 29 in a counterclockwise direction as viewed in Fig. 2 around stud 23 to lower 1 the remover B. so that its intake mouth 26 will be behind thread I. As the lay moves rearwardly the shuttle will be picked out of the box 15. behind tube 25 and part of thread T- will move. into the mouth 26 due to pneumatic. attraction and the remainder thereof will extend from the remover R to the cloth selvage. The freshly replenished shuttle will leave a thread T extendingIfrom the holder H to the cloth.

As weaving continues the two threads T and T will move forwardly and come. within the range of operation of the. temple cutter l3. If the threads are hairy. and; coarse they are likely to be. matted to ether subs que t. o h Sewa cutting operation, in which event thread T is ow r he r mpver R. a d. e y to enter the latter due to the fact that the remover exerts more pneumatic tractive force on the thread 'r' than does the holder Ir thread '1" should enter the, rerndver both the pneumatic devices R," and H reit'r rtes oh opposite ends of the threadT" and the latter cannot be removed from the loom. c 'The 'matter'fthus far described is of known construction and the pneumatic parts may be asset fdrth for instance momma States Patents Nos. 2,199,296; 2,199,353 and 2,199,354. y

In carrying the preferred form of the invention into effect I provide a stationary hook 40 supported by the breast beam H, see Fig. 3, and a'thr'ead placer or pusher 41 on the lay. The hook has a notch 42 which faces forwardly and is so located that the distance from it to the temple cutter measured along the length of that part of thread T between the hook and the temple cutter is less than the distance between thehook 40 and the intake mouth 26 of remover R. As the lay moves forwardly on a pick subsequent to replenishment the thread T is engaged by. the placing means or pusher. 4| and moved up over the hook "and into the notch 42. The pusher 4| also has a notch 45 and. moves inn path below notch 42 so that on subsequent forwa d ea s f the lay the. pushe w o e age the thread T.

The operation of the preferred form of the invention is shown diagrammatically in Figs. 6-8. As shown in Fig. 6 the threads T and T are still attached to the cloth C but have reached the temple cutter l3. Thread T extends into the remover R and thread T extends into the holder H and is also located in the notch 42 of hook 40 which serves as a retaining or engaging means for thread T. In Fig. '7 the threads T and T are shown as having just been cut from the cloth by the selvage cutter with their cut ends loosely matted together as indicated at 50. Severance of the two threads from the cloth enables the pneum'atic devices R and H to attract their respective threads, but since thread T is much longer than thread T and also because the holder I-I receives a number of threads in addition to thread T, remover R attracts its thread T more readily than holder H attracts its thread T. As a result, the left end of thread T moves toward the remover R, but since the length of thread T from hook 40 to the selvage cutter is less than the distance from hook 40 to the remover R, the matted parts 'of the two threads will not be able to reach the remover. Lip 46 above notch 42 is bent toward the cloth to prevent the thread T from slipping off hook 40 as it moves toward remover R.

As already indicated the threads are held together at 50 by a slight degree of adhesion only and will separate as indicated by the gap 5| in Fig. 8 when the threads straighten out between the hook 40 and the remover R. The remover is therefore enabled to attract into itself the thread T, and the thread T is released so that it can respond to the pneumatic force exerted by the holder H.

In the modified form of the invention shown in Figs. 9-l4'the parts are similar to those already described except for the means which controls the thread T. Instead of stationary hook 40 there is employed a lay carried hook indicated at 60. This hook has a forwardly facing notch Bl at the upper end of a relatively long. downwardly and forwardly inclined guide surface or edge 62 on book 60.. The latter is held by a small bracket 63 on the front of the lay and is adjustable vertically on the bracket by means of bolts 6.4 so that notch 6| can be raised and lowered.

If desired a stationary hook and thread pusher ofknown construction and similar to that described in' connection with the preferred form of the invention may. be employed in their usual locations. a thread pusher 65 on the lay can be utilized to cast thread T over a stationary hook As shown in Fig. 9 the hook 66 is to the right of the remover R and of itself is not correctly located for the purposes of the present invention. By. its use, however, the thread hook on the lay need not extend as far forwardly as would be desirable. if the stationary hook 6.5 were not; used.

After thread If has been engaged by hook 66 it will extend from the latter to the cloth selvage across the path of the movable hook B0, and as the lay advances the latter hook will move thread T to the position shown in Fig. ll. This movement willplace thread T under some tension, but the yarn I in collector 39' permits some yielding of thread 'I? without however releasing it.

As the lay recedes and the movable hook so assumes the position shown in Fig. 12 there may be some slackness of the left end ofthread "1;" as indicated for instance. at a. This slackness however will notpermit the thread to fall below accrues the bottom of guide edge or surface 62, and when the lay again beats up the thread T will enter the notch BI and become taut as indicated in Fig.

11. When the threads T and T are eventually cut from the cloth'by the cutter [3 when the lay is at front center the remover R will shortly thereafter pneumatically attract the threads un:-

'til they straighten out between notch 6| and the remover R. This straightening will occur ordinarily before the matted parts 58 are able to 'reach the remover R, and the two threads will separate as indicated at in a manner similar which thread T extends when leading from the cloth selvage is closer to the thread cutter .l3 than to the remover R. This, however is not an essential relationship for all conditions under which the invention may be used, since it will be sufficient if the hooks are so located that the remover R will not be able to exert sufficient tractive force on thread T to overpower the pneumatic traction of the holder Thus, it would be sufficient if the hooks 4|) and 60 were equally distant from the selvage cutter and the remover, since this would prevent thread T from entering the remover. These hooks may under some conditions actually be slightly closer to the remover .than to the selvage cutter, provided the parts are so placed as to prevent any considerable amount of thread T from entering the remover. The pneumatic pressure within the remover can e relied upon ordinarily to separate the matted ends of the threads and it will answer the purposes of the invention if the hooks of either the preferred or the modified form are so located that the remover will never be able to exert a pneumatic force on thread T equal to or greater than the force exerted by the holder H. The stationary hook 86 can if desired be used with the preferred form of the invention, in which event hook 40 need not be as far forward on the lay as indicated in Fig. 1.

From the foregoing it will be seen that means are provided to prevent the remover R from attaining control over thread '1". This result can be accomplished by having the hooks 40 and 60 nearer to the selvage cutter than to the remover R. As already stated, however, entry of thread T into the remover tube 25 for a short distance will not necessarily defeat the purpose of the invention if the rem-over under these conditions is not able to exert sufficient pull on thread T to oiTset the pull of holder H. The holder H limits movement of the thread T toward the cloth and thus cooperates with the hooks 4i] and 60 to prevent thread T from coming under control of remover R. Each of the hooks 40 and 60 has a part which is between the threads T and T, and this part is preferably bent toward the cloth to prevent thread T from slipping off the hook when moving toward the remover. The yarn Y permits a limited yielding of thread T without however releasing it. While holder H pneumatically attracts thread T it is found for reasons already mentioned that the remover R is quicker in its operation than is the holder H and therefore exerts the principal force determining the direction of travel of the matted parts of the threads after selvage cutting. Furtherremover.

more, the hook which cooperates with the remover and'holder may be either stationary or on the lay. Having thus described my invention it will berseen 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, butwhat I claim is: V

1. In a weft replenishing loom, a pneumatic thread remover, a selvage cutter, a thread hook nearer to the selvage cutter than to the remover, the loom having a thread entering the remover and matted at one end thereof to one. endof a second thread as the result of operation ofthe selvage cutter, said second thread being engaged with said thread hook, and holding means for the second thread cooperating with said thread hook limiting movement Of said end' of the sec.-

'ond thread toward the remover, the 'latter'pneumati'cally attracting the threads and said matted ends and cooperating with said thread hook and holding means to effect separation of the matted thread ends before the latter reach the 2. In a weft replenishing loom having a selvage cutter, a pneumatic thread remover, a thread hook nearer to the cutter than to the remover, the loom having two threads one of which enters the remover and the other of which engages the thread hook, adjacent ends of said threads being matted together subsequent to cutting ofv said threads from the selvage by the selvage cutter, and means preventing movement of said other thread along said thread hook in a direction toward said remover, the remover pneumatically attracting said one thread and said matted ends and cooperating with the thread hook and means to effect separation of the matted thread'ends before the latter reach the remover.

3. In a weft replenishing loom, a thread re mover, the loom having two threads attached to the cloth selvage one of which enters the remover and the other of which is held against movement toward the selvage, a selvage cutter cutting said threads from the selvage in such manner that they cling together, said remover thereupon moving toward itself both of said threads, hook means for the other thread, placer means moving said other thread into engagement with said hook means, the distance between the hook means and selvage cutter being less than the distance between the hook means :and remover, said hook means preventing said other thread from reaching the remover and cooperating with the latter to separate said threads.

4. In a weft replenishing loom operating with a lay and having two threads extending from the cloth selvage, a pneumatic thread remover into which one of said threads extends, a pneumatic thread holder into which the other thread extends, a selvage cutter, a thread hook nearer to the selvage cutter than to the thread remover, and means on the lay moving said other thread into engagement with said thread hook, said selvage cutter thereafter cutting said threads from the selvage in such manner that parts of said threads are matted together, said remover and holder thereafter pneumatically attracting said threads and matted parts thereof and said thread hook cooperating with said holder to prevent said matted parts of said threads from reaching the remover.

5. In a weft replenishing loom operating with a lay, a pneumatic thread remover, a pneumatic assume ing from the cloth selvage into the remover and having a second thread extending from. the selvage into the holder, a selvage thread cutter, a stationary thread hook, the distance between said hook and selvage cutter being less than the distance between said hook and the remover, placing means on the lay moving the second threadinto engagement with. the thread hook,

said selvage cutter thereafter severing said threads from the cloth selvage in such manner that parts of said threads. are matted together,

whereupon the remover pneumatically attracts saidonethreadaand said: matted thread partsand the thread hook and holder cooperate to prevent said matted; thread parts from reachingsaidremover and cooperate with, the latter to separate said matted parts. 6; In a weft replenishing loom, having two threads parts of which are matted together subsequentto cutting at a point near the cloth selvage, a thread engaging hook, two thread removingmeans, one threadibeing-spacedfrom said hook and leading from the point of cutting directly to one of said removing means and the other thread leading from the point of cutting to the other means and engaging said hook, each removing means tending to move the associated thread toward itself, and the hook beingnearer to said point of cutting than to either of. said removing means and effective-subsequent, to said cutting to prevent the matted parts from reach ing either removing means.

7. In a weft replenishing loom having two threads parts of which are matted together sub;-

sequent to cutting at a position near the cloth selvage, two thread removing means at different distances from said positiomone for each thread,

81 each removings means tending'to move said matted parts toward itself, and retaining, means engaging one of said threads at a point nearer to said position than. to either removing means and cooperating with both of said removing means to prevehtsaid matted parts from reaching either removing means.

8. Ina weft replenishing loom, two pneumatic thread attracting means, the loom having two threads one of which leads from the cloth 'selva'ge to one or said attracting means and the other of which leads from the cloth selvage. to the other attracting means, each attracting means tending to draw the corresponding thread the'reinto, means-cutting the threads at the selvage in such manner that parts of the threads are matted together, and a thread hook engaging one of said threads at a point nearer to the selvage than to either attracting means and cooperating with the attracting means to prevent said matted parts from reaching either attracting means.

WALTER H. WAKEF'IELDi REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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