US1929261A - Shuttle tension - Google Patents

Description

E. SCHERDEL Oct. 3, 1933.

SHUTTLE TENS ION Filed Aug. 3, 1951 F153 J R as ,so

Snllentor' G, gi d Scherd 4P attorney 8 Patented Oct. 3, 1933 1 UNITED STATES PAT-EN SHUTTLE TENSION Egid Scherdel, Worcester, Mass, assignorv to Crompton 8a" Knowles Loom Works, Worcester, Mass., a corporation'of Massachusetts Application August 3, 1931. Serial'No. 554,660 11 Claims. (01. 139-215) This invention relates to improvements in weft tensions for shuttles and it is the general object of the invention to provide a shelf-threading draw-back tension which will be capable of pulling back a large amount of weft when the shuttle comes to rest at theend of its flight.

In certain classes of shuttles for weaving fine fabrics it is desirable to employ a pull-back tension which will take up any slack that results from the rebounding of the shuttle or the forward movement of the lay after the shuttle is boxed. This is particularly true in the use of wefts which are relatively inelastic and also in the weaving of those fabrics where the weft tension must remain substantially uniform. A form of tension which has gone into very extensive use is that employing a set of fixed pins for guides between which play a set of loops bent in a pivoted wire. It is an important object of my invention to provide a tension of this type wherein the end loop is in the form of a spiral trap for the purpose of preventing unthreading.

' In tensons of this general class heretofore proposed the movement of the pivoted wire having the loops has been induced by the weft in such a way that the take-up is proportional merely to the movement of the loops betweenthe fixed pins. It is a further important object of my present invention to provide the pivoted member with an actuator arm wh ch is engaged by the weft and is operative to add to the draw-back caused by the movement of the loops with respect to the pins. In this connection I make use of the arm to move 7 the loops into threading position. The arm may preferably move across the pathof movement of the weft as the latter moves from one of the pins to the shuttle delivery eye, and the looped wire is preferably though not necessarily pivoted in N that part of the tension cavity of the shuttle remote fromthe bobbin.

. With these and other objects in view whichwill appear as the description proceeds, my invention resdes in the combination and arrangement of parts hereinafter described and set forth I in the claims.

In the accompanying drawing, wherein a convenient embodiment of my invention is set forth, Fig. l is a top plan vew of one end of a shuttle made according to my invention with the weft as it appears on the first pick after transfer,

. Fig. 2 is a view similar to Fig. 1, but with the weft shown as threaded through the delivery eye on the return pick after tran'sfenj Fig. 3 is a vertical section on line 3-3 of Fig. 2,

- and Fig. 4 is a perspective view of the tension member and its coacting fixed pins or posts. Referring to the drawing, the shuttle S has weft chamber C to receive abobbin B and also a tension chamber T in which the subject matter .of my present invention is located. The latter chamber may be elongated in the direction of the axis of the shuttle and of appropriatedepth, and communicates with the weft chamber by athroat" 10. There :'s provided in the front wall of the shuttle a delivery eye D which connects at its rear end with the tension chamber T. An appropriate cover 11 may be secured-in any man-' ner to the shuttle and extendsover a portion of the thread chamber as indicated in dot and dash" lines in Fig. 1.

There is projecting upwardly from the floorof the tension chamber a pivot pin 20 around which swings a tension member or wire designated generally at2l. -The latter may be formed in any way to provide a bearing surrounding" the pivot and hasv a rearwardly extending finger 22' attached to an elastic 23 'the'other end of which,

is anchored to the shuttle as at 24. The efiect'of the elastic is to tend to hold the wire tion shown in Fig. 1. 7 1 v i The wire is formed asshown in Fig. 4 and hasupright portions 25 formed at the front of the wire. Downwardly facing hooks 26 are disposed rearwardly of the vertical portions 25. As shown in Figs; 1 and 2 there are two of these books and there are projecting upwardly and preferably in alignment longitudinally of'the shuttle a series: of guide pins 27, 28, 29 and 30, respectively. ,One of the hooks is positioned to movebetween the pins 29,and 30 while the other hook moves be? tween the pins 28 and 29. The end of the wire which is, adjacent the throat 10 is formed of a spiral trap 31 as shown in Fig. 4, the end of, the trap toward the throat having a coil of relatively small diameter, while the end toward'post '28 is of 'a relatively'large; diameter. f f

That end of the wire opposite'the spiral is bent to extend forwardly and horizontally as at 32 and then downwardly as at 33, and then upwardly to form 'a thread engaging actuator arm 34*bent; to define a'slight notch 35. The parts are related normally'as shown in Fig.1 withthe arm Si in front of the line of pins. :1

In the threading of the shuttle during the first pick subsequent to transfer of bobbin B into the shuttle, the weft W will extendfrom the bobbin chamber through the throat 10, along the series of pins and across the tension cham-.

i he P ber, and then over the end of the shuttle through an undercut groove 40. On the return pick the weft will be guided under the beak 41 of the plate and be directed downwardly against the upper part of arm 34. The shuttle may be provided with any approved form of guide slot 42 which will direct the weft toward the delivery eye D. .Asthe weft moves down slot 42 andv into engagement with the arm 34 it assumes the position shown in full lines in Fig. 2. During this return flight toward the magazine the weft is attached to the selvage opposite the magazine, and

this causes the weft to pull against arm 34-. and

move the latter in a left hand direction as viewed in Figs. 1 and 2. The outer pin orpost130" acts as a guide pin to produce a bend in the .weft as the latter leads to the arm 34. The wire is thus thrown by the weft from the full lineposition shown in Fig. 1 to the full line position shown in Fig. 2.

- ThfishOQkSQPBIl' downwardly and are so formed that they slide over the weft in their movement betweenv the pins, thus causing the weft to lie between the hooks' and the front yerticalportions 25of-the wire. Also, the spiral trap 31 moves to; aposition behind an over the weft. As the wire swings against action of the elastic, the weft which has'been located in the notch 35 moves the said arm toward a line joining post or ping30and the delivery eye. The tension of the weftdue to continued. travel of the shuttle willhold the wiresubstantially in theposition shown infu ll lines in Fig. 2 until the shuttle is boxed. Should anyslackness resultin the weft due to .rebounding-of theshuttle or forward movement of the lay, the elastic will move the wirein acounter-clockwise direction around the pivot pin 20 toward; the dottedlineposition shown in Fig. 2. Whenzmoving to-this latter position theweft will begiven a zigzag course-as shown in dottedlines in Fig..2 becauseof the pins and the hooksand spiral. .Inaddition, the-weft will also be drawn towardthe right end of the-shuttle due to the factthat the notch.35 is moved in that-direction when the hooks-move to-the dotted line position of Fig. 2. This movement of thenotch is away from:.the aforesaid line joining the guide post 30 and thedeliveryeye, and-thereforeincreases thepaththrough which the weft must pass, thus affording additional 'take-up' or draw-back for the weft.

-It-is.f0und that the weft will pass arou nd the various convolutions of the spiral 31 andwillultimatelylie withinall the coils. Because -of this fact thethread-is held against displacement with respect to the hooks. The delivery eye is so placed vertically that the tendency of the weft issto move along a-line above the bottom of-the hookstending-in this way .toprevent unloopingoftheweft with respect to the hooks. The notch 35 isalso preferably so related to the spiral as to hold the weft'well above thebottomof the hooks.

. From the foregoing it will be seen that I have provided a simpleform of tension whichis preferably pivotedabout the end thereof remote-from thebobbin chamber andhaving awire with hooks andathread trapin theform of a spiralmovable by a force communicated through an extension of-=the wire'which-engages-the weft asthe shuttle is threaded. The arm has a movement which tends to drawbackthe weft when the elastic i lower endsof the'hooks.

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 the details herein disclosed, but what I claim is:

.1. In a self-threading weft tension and weft pull-back for a shuttle having a delivery eye, a plurality of spaced weft engaging posts fixed to the shuttle, and two weft engaging elements secured to each other and 'movable about a pivot fixed on the shuttle, one of said elements having spaced thread engaging members to become engaged and threaded. with the weft at points between the pins, and the other element normally in "thread engaging position when the members are out of threading position to engage the weft asthelatter moves toward the delivery eye to move the other element to threading position, and yielding means to move both elements in a direction toexertdraw-back tension on the weft.

2. In a self-threading shuttle tension and weft;

pull-back for a shuttle having. weft and tension chambers and-a delivery eye, a pluralityof spaced weft; engaging postsfixed in the shuttle, elements each to engage-and tension the weft and located in the tension chamber, means normally to hold one of the elements spaced from the pins, the other element being positioned to engage. the weft while the first element is spaced from and out of threading relation with respect to the pins as the weft moves toward the delivery eye to move the first element toward the pins to cause said first element to become threaded with the weft, said'means effectiveto move each'element in a direction to take up slack-in the weft- 3. In a self-threading weft tension and weft pull-back for a shuttle having a delivery eye, a plurality of spaced weft engaging posts fixed to the shuttle, a resilient element, and a swinging member movable against action of the element and having two parts each to tension and pull back the weft, one part extending into the path of the weft while theother part is out of the path.

of the-weft and effective to move the other part towardthe posts by aforce derived from the weft, and the other parthaving provision for. engaging the weft between the posts when said first partis moved by the weft, the resilient element to move said other part away from the posts andv the first part against the weft to tension andpull back the weft.

4. In a self-threading shuttle, a delivery eye 5. In a self-threading shuttle, a delivery eye' for the weft, a series of spaced pins, a movable tensioning member having a hook and'an'actuating element, the element normally positioned to be engaged by a weft extending from a pin to the eye and effective when so engaged to move the hook toward the pins by a force derived from 'the weft to cause said hook to engage the weft at a point between the pins; and means to move the member to cause both the hook and elementto cooperate with the pins to take up slackin the Wef 6. In a self-threading shuttle, a delivery eye for the weft, a series of spaced pins, a movable tensioning member having a hook and an actuating element, the element normally positioned to be engaged by a weft extending from a pin to the eye and effective when so engaged to move the hook toward the pins by a force derived from the weft to cause said hook to engage the weft at a point between the pins, and means to move the member to cause the hook to coact with the pins and the element with one pin and the eye to take up slack in the weft.

'7. In a self threading shuttle, a delivery eye for the weft, a series of spaced pins, a movable tensioning member having a spiral thread trap and an actuating element and a hook between the trap and element, the element positioned to be engaged by the weft and moved by a force derived from the latter to move the trap and hook toward the pins, causing the trap and hook to engage the weft at points spaced from the pins, and yielding means to move the member to cause the trap, hook and element to cooperate with the pins and take up slack in and tension the weft.

8. In a self-threading shuttle, a delivery eye for the weft, a series of spacedpins, a movable tensioning member having a spiral thread trap and an actuating element and a hook between the trap and element, the element positioned to be engaged by the Weft and moved by a force derived from the latter to move the trap and hook toward the pins, causing the trap and hook to engage the weft at points spaced from the pins, and yielding means to move the member to cause the trap, hook and element to cooperate the weft, the hook extending on both sides of a line joining the trap and the part of the element normally engaged with the Weft.

9. In a self-threading shuttle, a delivery eye for the weft, a series of spaced pins, a movable tensioning member having a spiral thread trap and an actuating element and a hook between the trap and'element, the elementpositioned to be engaged by the weft and moved by a force de-. rived from the latter to move the trap and hook toward the pins, causing the trap and hookto engage the weft at points spaced from the pins, and yielding means to move the member to cause the trap, hook and element to -co-operate with the pins and take up slack in and tension the weft, the hook extending below a line joining the trap and the part of the element normally engaged with the weft.

10. A tension element for the self-threading shuttle comprising a single piece of wire having a spiral trap at one end and an actuator arm at the other end and havingca bearing and also a hook intermediate the trap and arm, the arm having a notch and the hook extending on both sides of a line joining the notch and trap.

11. A tension element for the self-threading shuttle comprising a single piece of wire having a spiral trap at one end and an actuator arm at the other endand having a bearing and also a hook intermediate the trap and arm, the arm having a notch and the hook extending below a line joining the notch and trap.

EGID SCHERDEL.

with the pins and take up slack in and tension

Images