US2510603A - Thread control for weft replenishing looms - Google Patents

Description

June 6, 1950 G. N. PETERSON THREAD CONTROL FOR WEFT REPLENISHING LOOMS Filed Feb. 25, 1949 INVENTOR GEORGE N. PETERSON ATTORNEY Patented June 6, 1950 THREAD. oomnonroiz; REBIJENISHING'LQGMS G'eonge-r N; Retersom Grafton; Masse assigamrztba Gremptbn & Knowles. Loom ltlolzoesrter; Mass, areal-notation of Massaehusetts- Amglication February 23, 1949'; Serial No; $75791 5 Claims; (Cl. Lia-$451):

This inventionrelates to thread controls for: weft replenishing looms and-it is the genera-1' ob-- j'ectof the invention to provide-simplemeans for preventing the thread of a transferred bobbin fromreentering the magazineandoccupyingapositibrr in which it can interferewith the next bobhiir to be transferred:

In Weft replenishing looms more" particularly of the multicolor type the -magazine is providedwith yielding supports or' giveways on which" a bobbimrests as it awaits transfer. At the time offtrarisfer the" bobbin is moved dowrr from the magazine into theemptyshuttle and" the weft end'Qfthebob'bih, ordinarily held at its outere-ndi to some form ofthzreadr holder; moves with the bobbin; Shortly after transient-he freshly replenished bobbihis picked and there is likelihood'that the thread extendihg-f'romthe thread holder to the shuttiewiil be whippedback into themagazineand occupy a position where it can interfere with movement of the'next bobbin to-- transfer position; It is animportant" object of the present invention to provide simple means; preferably-in the form of bristles,- or! abobbin support, so' placed as to= prevent reentry-01"the thread in-to the-magazine;

The yielding bobbin tip supgorts are apart-bythe bobbin tip du-ring atransfer operation and then return to their normal position priortogpicking. Iti'sra further object of the invention; tUIIlOl-lflt the aforesaidbristies on one or both of theyieldingsu'pp'orts' so that the bristiesj-wilizmove away from thread restraining" position during transfer to permit easydown ward movement of the, weft" in the: bobbin and? thenzreturn to threa'dj rest'r ainingposition before the;replenished shuttle-"is picked;

In. some forms; of thread:-controPmeehanism-it? is customary to empi'oya hoolt 0nthe lay-Which: moves the: thread of the freshly: transferred bqboinoverastati'onary'hook ozrtheloom -frame.- If the thread of thetransferred bobbin" is" too hi'gh-to bereachedby theihooie on the lay it will remain inthe magazine 'or shuttleboxandmotbe hooked over the-stationary hook. Wherrthi'shappens the thread control mechanisms suehas those provided for remova'hof the thread after its is cutz are not" likely to be' -abl'e toactproper-Iy on thethread: Iti'sra still' further objector the invention to provide-yielding meanssuch as bristles whi'eh willg keep the thread' in ar relatively lbw-positionaftentransfersozthat itwiii be-with in the path of the hook on the lay. I

With thesean'dmther objeetsinview whibhv-will azppearz'ais the dtseription proceeds; the inventierr 65? suppost I 8 isv limit'efi as 'to its forwardi and up? resides: the. combination andarrangement of part's hereinafiten' described and set-forth:

In theaocompanyin-g drawmgs; wherein a; con venient em'bod'ifr-r-ientofthedmrention is; set fortht Fig. 1 is a side eIevation ofpart oi a; weft re-- nienisliing mechanism having the invention appii'ed thereto, 7

Fig: 2 is an enlarged viewof'the lower partoi the -magazine shown'in Fi'gz 1 Fig; 3 is an enlarged plan View ofi'thebobbih tip supports and a bobbin tip thereon showin the relation ot -"the weftend of"the-bobbin relatively t'o the-bristies;

Fig; is an enlarged verticaldetaiiedsection' nectedtothe bobbi-n huttguiding-and supporting inner-plate M of the magazine and thi's' plat'e' by means' of tie rods f5 supports" the outer or bobbin tip-guidingend plate It of the magazine.-

Yi'elding supports are provided for boththe-- butt andthetip'of a bobhih in transfer positionihr the magazine; but since the--ihvention is relater? more: particularly to the: thread extending fromi the tip the supgortsfor thebobbih tipbmyare shown: Fig: 2'shows front and-hack" bobbin tip supports or giveaways IFand Hire-- spectiveiy; which are mounted on links I9-- and 20, respectively: Links l-9i's pivoted onone ofthe' tiero-d's l5 and" is actedorr bytorsion spring 21- whioh tends-to-turn it in a counterclockwise-m motion as viewed" i-rr Fig: 2 thereby exerting a fbrcetendihgto move-the--front support [-1 rear Wardly, or to the right, Fig: 2: A stop -screw 2'2 threaded into the l'inle W engages a forwardly extending fiinger 2 3 orthe support l p'to provide vertical-adjustment for thesupport' t1"; The-support f l hy its engagement as at 215 with part of the magazine-mm plate- |=6 is limited as to re arward and upward motion;

ltn-simiiar mamner the*rear: support l8 i's aoted upon by the torsion spring ZB' on a rear tiered I 5 and acts-tolmove the link 202111 a olockwiseidi motion; thereby moving thebaohsupport I 8'for-- wardiyror to the lett as viewedfin Eigz 2. Stop, screw 28 si'm-il'an to: stop: screw 22 andi'. the real:

Ward movement by engagement with the end plate 16 as at 21. The adjacent ends of the supports I! and I8 are spaced from each other and define between them a vertically extending thread passage 28, see Figs. 2 and 3.

The magazine has provision for storage of several stacks of bobbins and also has means for releasing the bobbins from their respective stacks so that they can move to a transfer position. The stacks of bobbins and releasing means are not shown in the drawings, but will be as usual. In Fig. 2 a bobbin T is shown in transfer position. When in this position the bobbin tip will be supported by the front and back supports [1 and I8 and the weft end or thread W connected to the yarn on the bobbin will extend through or above the passage or thread slot 28. The weft thread W leads outwardly from the magazine to a thread holder designated generally at H, see Fig. 5.

' The thread holder is preferably though not necessarily of the pneumatic type. It may be similar to thread holders used in a well-known type of two-color weft replenishing loom having a reciprocating pump which periodically creates subatmospheric pressures within the intake .iouth 32 of the holder. The holder may, on the other hand, be made as shown in Patent No. 2,431,556 and be associated with a continuously running pump and controlled so that the intake mouth is open periodically. In either event the weft ends of the bobbins in the magazine and also the weft end of a bobbin T in the transfer position will lead to the thread holder and the latter will exert a slight tension on the thread.

The lay 35 of the loom is provided with a shuttle box 36 in which is located a shuttle S. The shuttle box includes in its construction a forwardly and upwardly extending hook 37, and a second hook 38 is secured in fixed position to some part of the loom.

Ordinarily there is no bobbin on the supports 7 and ill, but when a weft replenishing operation is to occur a bobbin moves in well-known manner to the transfer position with its tip resting on the tip of the supports l! and i8, as shown in Figs. 2 and 3. As the lay beats up the transferrer arm ll descends and pushes the bobbin out of the magazine into the shuttle S, and in doing so effects a, lowering of the thread or weft end W of the bobbin being transferred. During transfer the bobbin tip spreads the supports I1 and l 8 apart, but they immediately return to the position shown in Fig. 2 before the replenished shuttle is picked.

The matter thus far described is of common construction and may be constructed as set forth for instance in Patent No. 1,030,748. The supports I! and 18 are shown as one of several forms of bobbin tip supports, and the invention is not limited in its use to the precise form of supports shown herein.

In carrying the present invention into effect, a thread restraining means is provided which will prevent the thread of the transferred bobbin from returning upwardly through the passage 23 into the magazine. As shown herein this restraining means, designated generally at 40, takes the form of a plurality of flexible resilient bristles BI which are mounted on the front bobbin tip support H and extend across the passage 28 as shown'in the lower part of Fig. 2. The bristles may be held by a clip 42 fixed to the support I! by a screw 43. The bristles are preferably on the outside of the magazine where they will be out of the path of the bobbin tip 30 during bobbin transfer. The bristles are also preferably located between the thread holder and the thread passage or gap 28, although this relationship is not essential.

During a bobbin transferring operation the supports l1 and 18 will move apart so that passage 28 is widened temporarily and there will be a relative forward movement of the bristles with respect to the rear support [8. Because of this movement the bristles will not extend quite as far beyond support l8 as they normally do, and the thread W as it moves down with the bobbin will be able to bend the bristles downwardly and move from the dotted line position to the full line position shown in Fig. 5. Movement of the bristles by the thread will be due in part by the fact that the bristles are moved bodily in a direction away from their normal restraining position, and also in part due to the fact that the bristles are resilient and the thread is. kept under tension by the holder H.

This action occurs at the time of bobbin trans fer, and the supports I! and I8 thereafter immediately return to their normal position, whereupon the bristles are restored to the position shown in Fig. 2 where they lie across the path of the weft thread W should the latter try to move back into the magazine by upward movement through the passage 28. As the shuttle is picked the thread W may be whipped upwardly, but the bristles will prevent it from entering passage 28. Also, the thread will extend from the bristles to the left, Fig. 5, and be in the path of hook 31 to be placed by it on hook 38 on the next lazy beat-up, at which time the thread will become attached to the selvage of the cloth C.

From the foregoing it will be seen that the invention sets forth simple means which effective ly prevents return of the weft of a transferred bobbin into the magazine. This means may take the form of flexible bristles mounted on one of the yielding or giveway supports for the bobin tip and is preferably located between the thread passage 28 and the holder H, although this par ticular location is not essential in all forms of the invention. When the bristles are located as shown in Fig. 3, for instance, they are out of the path of the downwardly moving bobbin tip and will therefore not be damaged by it during transfer operation. The fact that the thread holder tensions the weft end assists the latter to deflect the bristles when the bobbin is transferred, especially in view of the fact that the bristles are close to the tip of the bobbin. The tendency of the thread to whip up through the passage 28 occurs when the shuttle is being picked and the bobbin tip has moved away from the bristles. The bend in the thread at this time produced by the underside of the bristles is much less than the bend produced by the top side of the bristles at transfer, and the bristles are better able to withstand the tension of the thread. Spreading of the supports l1 and I8 at bobbin transfer moves the bristles away from their normal restraining position and assists the thread to move to a position below the bristles. Also, the bristles are at such an elevation that without respect to the height of the thread holder the thread W of the incoming bobbin will not only be prevented from reentering the magazinmbut will also be held within the range of motion of the movable hook 31.

' Having thus described the invention it will be seen that changes and modifications of the forer going specific disclosure may be made without departing from the spirit and scope of the invention.

What is claimed as new is:

1. In a weft replenishing loom having a thread holder tensioning the weft end extending from the tip of a bobbin in a reserve bobbin magazine, bobbin tip support means on the magazine defining a thread passage through which said weft end passes downwardly when the bobbin is transferred, and flexible resilient means mounted on said bobbin support means extending across said passage yielding to permit downward movement of the weft end and effective to prevent upward movement of the weft into said passage subsequent to transfer of the bobbin.

2. In a weft replenishing loom having a reserve bobbin magazine and a thread holder tensioning the weft end of a bobbin in transfer position in a magazine, resiliently mounted bobbin tip support means defining a, passage for the weft end normally in bobbin tip supporting position but moved by the bobbin tip when the bobbin is transferred, and flexible resilient means on said bobbin support means moved with respect to said passage when the support means is moved by the bobbin when the latter is being transferred to facilitate downward movement of the weft end, said flexible resilient means being normally positioned by the bobbin tip support means to limit upward movement of the weft end into said passage subsequent to bobbin transfer.

3. In a Weft replenishing loom having a thread holder tensioning the weft end extending from the tip of a bobbin in a reserve bobbin magazine; bobbin tip support means on the magazine defining a thread passage through which said weft end passes downwardly when the bobbin is transferred, and flexible resilient means mounted on said bobbin support means between the thread holder and support means extending across said passage and yielding to permit downward movement of the weft end and effective to prevent upward movement of the weft end into said passage subsequent to transfer of the bobbin.

4. In a weft replenishing loom having a thread holder tensioning the weft end extending from the tip of a bobbin in a reserve bobbin magazine, a pair of bobbin tip supports resiliently mounted on the magazine and normally in bobbin tip supporting position and defining between them a thread passage through which the weft end of the bobbin passes incident to transfer of the bobbin, and flexible bristles on one of said supports normally preventing theweft end from moving back into said passage subsequent to transfer of the bobbin.

5. In a weft replenishing loom having a reserve bobbin magazine, bobbin tip supports resiliently mounted and normally in position to support a bobbin tip, said supports being spaced to define a thread passage therebetween, bristles mounted on one of said supports out of the path of the bobbin tip when the latter is transferred, said one support when in normal position 10- cating the bristles in the normal position thereof across said passage, said one support being moved by the bobbin tip incident to bobbin transfer and moving the bristles away from the normal position thereof to facilitate downward movement of the weft end in said passage, and said one support subsequent to transfer returning to normal position to return the bristles to the normal position thereof to prevent upward movement of the weft end of the transferred bobbin into said passage.

GEORGE N. PETERSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,552,025 Bailey Sept. 1, 1925 1,826,298 Bergstrom Oct. 6, 1931 2,335,534 Reynolds Nov. 30, 1943 2,387,122 Darwin Oct. 16, 1945

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