US1708513A - Poration - Google Patents

Description

April 9,1929. MARSH 1,708,513

THREAD TENSIONING DEVICE FOR AUTOMATICALLY THREADING LOOM SHUTTLES Filed May 28, 1928 I! IIUMINHHNIIIIIT '8 //v VENTOR.

A TTORNEY Patented Apr. 9, 1929.

UNITED STATES PATENT OFFICE.

HAROLD MARSH, OF NEW BEDFORD, MASSACHUSETTS, ASSIGNOR TO DRAPIR COR- PORATION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

THBEAD-TENSIONING DEVICE FOR AUTOMATICALLY THREADING LOOM SHUTTLES.

Application filed May 28,

This invention relates to automatically threading loom shuttles and is more particularly directed to the tensioning means for maintaining the thread under tension during weaving.

It is now the ordinary practice to provide auton'iatically threading loom shuttles with a. tensioning device at or adjacent its thread delivery end, to maintain the thread or filling under tension during the Weaving operation, and such thread tensioning devices have taken many forms. In weaving with certain kinds or characters of thread or filling, such, for instance, as silk, artifical silk, rayon and the like, much difficulty has been experienced in securing a proper tension to the thread or filling on the first pick of the shuttle following replenishment, and failure of the tensioning means in this respect produces in the cloth what is known as shiners. This is particularly observable in fabrics formed of silk, artificial silk, rayon, and the like, and one of the principal objects of the present invention is to provide an automatically threading loom shuttle with atensioning device so constructed and arranged that it will take control of the thread and tension it on the first pick of-the shuttle following replenishment, and maintain such tension during the subsequent weaving operations.

Animportant feature of the present invention consists in a tensioning device for automatically threading loom shuttles comprising two tcnsioning members having opposed tensioning surfaces curved in a vertical plane transversely of the shuttle in such relation to the path of the swirling thread as it is withdrawn from the shuttle that on the first pick of the shuttle following replenishment the thread will pass at once into control of the tensioning members and have tension applied thereto. v

The two tensioning members are normally held in thread tensioning position by yielding means, and one of the tensioning memhers is formed with a concaved tensioning surface extending heightwise of the shuttle and the other tensioning member is provided with an opposed convexed tensioning surface likewiseextending heightwise of the shuttle, the curve of the engaged tensioning surfaces being in substantial correspondence with the path of the swirling thread adjacent the tensioning members as it is with drawn from the shuttle.

1928. Serial N0. 281,204.

made clear from the following description and the accompanying drawings of one good practical form thereof.

In the drawings:

Fig. 1 is a top perspective view of an automatically threading loom shuttle containing the present invention;

Fig. 2 is a detached perspective detail on an enlarged scale of a threading block or shuttle eye showing one of the tensioning members connected to the block and the other dis-associated therefrom but in position for application thereto;

Fig. 3 is an end View of the threading block looking from the bobbin chamber and showing the relation of the tensioning members and the relation of the swirling thread to the reversely curved surfaces of the tensioning members;

Fig. 4 is a side elevation of the threading block, looking from the left, Fig. 3; and

Fig. 5 is a side elevation of the threading block containing the present invention and looking from the opposite side of the block, or from the right, Fig. 3.

The present invention is especially applicable to automatically threading loom shuttles wherein the shuttle is partially threaded on the first pick following replenishment and is completely threaded as the shuttle is returned to the replenishing box. The general practice in filling replenishing looms where the filling in the shuttle is changed, is to secure the end portions of the filling in the hopper to a fixed point, so that on the first pick of the shuttle following replenishment the filling will be withdrawn from the shuttle about the end of the bobbin in a swirling path and finaily pass into the longitudinal thread passage of the shuttle. The present invention takes advantage of this swirling action of the thread to cause it to pass into control of the tensioning device on the first pick of the shuttle and properly tension the thread, whereby shiners or defects in the cloth are obviated.

The shuttle 1. as indicated in Fig. 1, is of the filling replenishing type, and is provided with the bobbin chamber 2 and bobbin holding jaws 3 at one end of the shuttle for engaging the headportion 4 of a filling carrier or bobbin At the delivery end the shuttle is provided with a longitudinally extending thread passagev 6 and a side delivery eye 7 In the present instance of the invention, the

. longitudinally extending thread passage 6 is formed in a threading block which, except as hereinafter :more fully described, may be of any general and well-known type.

' The threading block 8 has an opening 9 by which the threading block may be held in the delivery end of the shuttle, as usual, through the engagement therewith of the transversely exttnrding holding screw, and, if desired, the threading block may have a downwardl projecting pin ltl 't'o' engage a corresponc ingly shaped recess inthe'shuttle.

As indicated more clearly'in Figs. 2 and 3,

the top portion of the threading block 8 has the downwardly inclined portions 11 and 1 2, one at each side of the entrance to the longitudinal thread passage 6,1the purpose-being to direct the thread downwardly into and through the longitudinal passage, as usual in filling replen-isl-nng shuttles of this general As hereinbefore stated, one of the principal purposes of the present invention is to insure pro'pertension being applied to the thread on the first 'pick of the shuttle following replenishnrent, and to this end the tensioning device is formedof two members having op- 'posedtensioning surfaces extending from a point near the top of the threading block downwardly in a curved. path corresponding substantially to the path of the swirling thread as it is withdrawn from the shuttle and passes about the end P01131011 130i the filling carrier or bobbin.

In the present illustration of the invention, the tensioning device isformed of a fixed and a movable tensioning member, and: such construction is a 'ood ractical form of the resent invention g P a although it may be modified in this respect, the essential being that the reversely curved tensioning surfaces of the tensioning members shall extend downwardly in a curved path such that as the swirling thread is withdrawnfrom the end of the bobbin, it will takea natural course into and between the tensioning members.

In accordance with the form of the inventron shown, one of the tensroning members,

as 14, is held in fixed position at the entrance to the longitudinally extending thread parsage,"an il has its upper portion 15 flared out wardly and secured in fixed position to the threadingblock so that it presents no'obstruction t0 the 'passage'of the thread. The fixed tensioning member 14 has the concaved downwardlycxtending tensioning surface 1 6 which is preferablycontinued downwardly beyond the entrance to the thread passage.

As herein shown, the fixed tensioning member has an outwardly extending projection 17 between the top and bottom thereof whichmay be secured to a portion 18 of thethreading block inappropriate'mannenas' by soldering or brazing, or otherwise. It is desir able that the downwardly concaved" tensionin-g surface shall extend as far as the bottom ing member, so that the two tensioningmembers have opposed reversely curved tensioning surfaces which extend downwardly from near the top of the threading block in a curve corresponding" substantially to. the path of the thread adjacent the entrance to the thread passage 6;, as itswi'rls' about the endof the filling carrier or bobbin while the thread is being withdrawn iromthe shuttle. v

In the present instance; of the invention, the movable tensioning member 20 has an upper interlocking portion 2i adapted'to engage a shouldered recess 22511 the threading block, as shown, Fig. 2, the construction-be mg such that the movable tenslon'mg member may articulate or swing about its" connection with the threading block and in a direction t0- ward the fixed tensioning'member 14, and \vhen'in thread tensioning' relation with the fixed tensioning member is locked from disengagement with the threading block.

In the present instance of the invention, the locking portion 21 of the movable-tensioning member has a recess 23 which engages about the shoulder 22* of the recess 22, and

a tongue portion 24 which engages the inner portlon of the shouldered recess 22 formed in the'threadingblock, as indicated more clearly in Fig. 5, with the result that while the ten-' 5 sioning member may be connected to the threading block by swinging it upwardly, as

indicated in Fig. 2, and then moving it laterally, and downwardiy, the tongue 24 will thereafter retain the movable tensioning member in its assembled relation with the threading block, with permissive movement of the tensioning member 20 toward the fixed tension-ing member. This particular means of connection between the movabletensioning member and the threading block may ob viou'sly be varied, but the construction de-' scribed represents a good practical form of connecting the movable tensioningmember in opposed relation with the fixed tensioning member at the entrance to the longitudinally extending thread passage 6, so that theswirling thread will be caused to engage the tensioning members between the end 13 of the; I filling carrier or bobbin and the entrance to Q the longitudinal thread passage. ,7 J

' The ten-sioning effect on the-thread between the tensioning members is caused by resilient in thread tensioning relation.

means normally acting upon the movable tensioning member 20 to cause'the two reversely curved tensioning surfaces to be pressed toward each other into substantial contact. As one good form of means for maintaining the relation between the tensioning members, the movable tensioning member 20 is extended downwardly beyond the longitudinal thread passage 6, as indicated at 25, and is there connected with a resilient or elastic strip or strap 26 the end 27 of which may be suitably knotted at the outside of an opening formed in the lower end 25 of the tensioning member. The elastic band-26 is then carried latorally through a recess 28 formed in the lower portion of the threading block and its up wardly extending portion 29 is then stretched and passed into an opening 30 formed between the lugs 31 projecting from the top portion 12 of the threading block, the result being that upon the release of the stretched elastic member 26, its upper end portion 32 will expand and consequently retain the elastic member under tension in drawing upon the movable tensioning member 20 to maintain the reversely curved tensioning surfaces The elastic member or band 26 forms a good practical construction for acting upon the movable ten sioning member 20, but in the broader aspects of the invention, other means, of course, might be (ll'lPlOYQd for this same purpose.

When the shuttle is picked following replenishment, the thread a will take a swirlin g course about the end of the filling carrier or bobbin 13 which is indicated in Fig. 3, and as the shuttle moves from the replenishing box to the opposite side of the loom, the swirling thread a will engage one or the other of the downwardly inclined portions 1.1 or 12 of the threading block and be guided into the entrance between the outwardly flaring upper end portions 15 and of the two tensioning members. As the shuttle proceeds on its course, the thread a will pass around the end 13 of the filling carrier or bobbin, as indi cated in Fig. 3, in the direction of the arrow, and will be given a downward pull as it passes from the top to the lower portion of the end 13 of the filling carrier or bobbin, as represented successively by the lines 7), c. (l, e and with the result that during the first flight of the shuttle following replenishment, the thread a during itsswirling action about the end of the bobbin, will travel a path substantially coincident with the curved tensioning surfaces of the fixed and movable tensioning members, and, finally, before the shuttle has reached the opposite box, will pass between the curved surfaces of the tensioning members and be given the desired tension. On the return movement of the shuttle to the replenishing box, the thread will obviously remain between the tensioning surfaces as it passes to the side delivery eye of the shuttle, so

that on the first pick of the shuttle following replenishment, the same tension is placed upon the thread as maintains during subsequent weaving, thereby eliminating shiners or defects in the cloth.

From the construction described it will be obvious that the present invention provides opposed tensioning members at the entrance to the thread passage and having curved tensioning surfaces extending heightwise of the shuttle in substantial correspondence to the path of the swirling thread at the part thereof adjacent the entrance to the longitudinal thread passage. The effect of this is that the swirling thread takes a natural course as itis withdrawn from the bobbin and is engaged between the two curved tensioning surfaces during the first flight of the shuttle following replenishment, and while the details of the construction hereinbefore described embody a good practical form thereof, it is evident that such construction may be varied within the true scope of the present invention, one of the essentials of which is that the opposed tension ing members shall present curved tensioning surfaces extending heightwise of the shuttle adjacent the entrance to the longitudinally eX- tending thread passage between which the thread will naturally pass as it swings about the end of the bobbin, so that on the first pick of the shuttle following replenishment the thread will be given the same service tension as it will have during subsequent weaving.

l/V hat is claimed is:

l. A tension device for automatically threading loom shuttles, comprising tensioning members having opposed friction surfaces extending heightwise of the shuttle in a curve substantially corresponding to the swirling path of the filling as it is withdrawn from the shuttle that the filling may be engaged between the curved friction surfaces and tensioned on. the first pick following replenishment.

2. A tension device for automatically threading loom shuttles, comprising tensioning members having opposed friction surfaces extending heightwise of the shuttle in a curve substantially corresponding to the swirling path of the filling as it is withdrawn from the shuttle that the filling may be engaged between the curved friction surfaces and tensioned on the first pick following replenishment, and means tending to force the curved friction surfaces towards each other.

3. An automatically threading loom shuttle having a longitudinal thread passage and side delivery eye, a tension device formed of two members having friction surfaces between which the thread is tensioned and which cross thelongitudinal thread passage in a curve substantially corresponding to the path of the swirling thread as it is withdrawn from the shuttle.

4. A tension device I for automatically threading loom shuttles, comprising, in com first'pick of the shuttle following replenishment.

5-. A tension device for automatically threading loom shuttles, comprlsing, in com bination, two members having outwardly flaring upper portions and one of which has a concaved tensioning surface and the other an opposed convex tensioning surface, both 6X' tending fromthe topportion towardsthe bottom of the shuttle in a curve substantially corresponding to the curve of the swirling thread as it is withdrawn from the shuttle,

andmeans foryieldingly pressing the curvedtensioning sarfaces relatively into thread ten.-

vsioning, position to impart tension to the thread on the first pick of the shuttle following replenishment.

6.- An automatically threading looii shut tle having a bobbin chamber, a side delivery eye, and a longitudinally extending thread. passage, a thread tensioning device at the entrance to the thread passage comprising two members having thread engaging tensioning surfaces reversely curved in a vertical plane extending transversely of the shuttle that the swirling thread may be engaged between the tensioning surfaces and tensioned thereby on the first pick of the shuttle following replenishment, and yielding means normally acting to press'the reversely curved surfaces into thread tensioning relation. v

7 An automatically threading loom. shuttle having a bobbin chamber, a side delivery eye, and a longitudinally extending thread passage, a thread tensioning device at the en trance to thethread passage comprising two members having thread engaging tensioningsurfaces reversely curved ina vertical plane extending transversely of the shuttle that the thread may be engaged between the tensioning surfaces and tensioned thereby on the first pick of the shuttle following replenishment, and an elastic band acting to draw the curved tension surfaces into thread tensioning relation.

8. An automatically threading loom shuttle having a bobbin chamber and side delivery eye, a threading block having a longitudinal thread passage, a fixed tensioning member secured to the threading block at one-side of the entrance to the thread passage, an opposed tensioning member mounted on the threading block at the opposite side of the thread passage for movement, toward the face concavely carved from top to bottom and the other tensloning member having a con- Vexly curved tensioning surface conformingto the concavely curved surface of the companion tensioning member, and means; acting yieldingly on the movable tensioning member to maintain the reversely curved. tensioning surfaces in thread tensioning relation.

' 9. In an automatically threading loom shuttle, the combination ofa threading block having a longitudinalthread passage, fixed and movable tensioning members having thread tensioning surfacescurved to correspond substantially to the path of the swirling thread and betweenwhich the thread is tensioned on the first pick of theshuttle fob lowing replenishment, and a yielding pull device acting to hold the tensioning surfaces in thread tensioning relation;

10. In an automatically threading loomshuttle, the combination of a threading block having a longltudmal thread passage, fixed: and movable tensionlng members having thread tensioning surfaces curved to corre spond substantially to the path-of the swirling thread and between which the thread is tensioned on the first pick of the shuttle following replenishment, and an elastic band.

acting on the movable tensioning member below the thread passage to maintain the tenand movable tensioning members provided with outward flaring upper end portions having thread tensioning surfaces curved to cor-- ing movement toward the opposite tensioning member that the swirling thread may, by its normal swirling movement, enter between the tensioning surfaces and be tensioned on the first pick of the shuttle followingreplenishment.

13. Inan automatically threading loom shuttle, the combination of a threading block'- having a longitudinal thread passage, threadi tensioning members having tensioning surfaces arranged in a vertical curve correspond ing to the path of the swirling thread as it is withdrawn from the shuttle, one of said tensioning members being mounted for swinging movement toward the opposite tensioning member that the swirling thread may, by its normal swirling movement, enter between the tensioning surfaces and be tensioned on the first pick of the shuttle following replenishment, and an elastic band secured to the swinging tensioning member and held under lengthwise stretch. I

14:. A tension device for automatically threading loom shuttles comprising opposed tensioning members having friction surfaces between which the thread is tensioned, and

an elastic band secured to the movable tensioning member and held under lengthwise tension.

15. A tension device for automatically threading loom shuttles comprising tensionin g members having reversely curved tensioning surfaces in a vertical plane transversely of the shuttle to engage and tension the thread on the first pick of the shuttle following replenishment, and means acting yieldingly to force the tensioning members into thread tensioning relation.

In testimony whereof, I have signed my name to this specification.

HAROLD MARSH.

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