US2207089A - Thread control for pneumatic thread extractors - Google Patents

Description

July 9, 1940 c. DARWIN THREAD CONTROL FOR PNEUMATIC THREAD EXTRACTORS Filed June 9.' 1959 Patented July 9, 1940 I o l i i UNITED STATE-s THREAD CONTROL FOR PNEUMATIC. THREAD EXTRACTRS Application June 9, 1939, SerialNo. 278,306

10 Claims. (o1. 139-256) This invention relates to improvements in the thread is limited in its forward motion away thread removers for weft replenishing looms and from the intake mouth, and is likewise prevented it is the general object of the invention to profrom moving upwardly out of the range of the vide means for confining resilient weft threads extractor. I have found that after cutting a porto positions where they can respond to the action tionof the thread will either curl on itself or 5 of the thread remover present a curved shoulder to theguard and thev There has recently come into use a form of latter dampens the thread movement and causes thread remover or extractor for weft replenishit to lie across the friction material in a position TENT orrios ing looms embodying a pneumatic tube having where it can respond to the draft of air moving I,

an intake mouth into which air was caused to into the 'intake mouth.

rush by means of an air pump 'or the like. The With these and other objects in view which will intake mouth is so placed at the time of transfer appear as the description-proceeds, my invention as to be in the path of the thread extending resides in the combination and arrangement of from the selvage'into theshuttle'box as the lay parts hereinafter described and set forth in the moves rearwardly. In order to direct the thread claims.

toward the mouth it is customary to use a tongue. In the accompanying drawing, wherein there projecting downwardly and forwardly in cooperare two forms of lmy invention set forth, ation with amass of deformable material such as Fig. 1 is a sidevelevation of parts of a weft pile fabric across which the threadv lies. The replenishing mechanism seen from the center of deformable material has a frictional contact with the loom with the preferred form of my invention `20 the thread sufficient to cause the latter to move applied thereto, parts in section,

rearwardly toward the intake mouths. l Fig. 2 is a plan View of the lay taken in the di- 4 In order that the thread may be free to respond rection of arrow 2, Fig. 1, with parts in section, to the thread remover the thread is cut at a point Fig. 3 is a vertical section on line 3 3, Fig. 2, near the shuttle eye on a transferring beat of showing thepreferred form of the invention, l25 the loom while the lay is in a forward part of its Fig. 4 is a'detail front elevation taken in the reciprocating motion, and provision is made to direction of arrow 4, Fig. 2, and lower the thread remover from its normally raised Fig. 5 is similar to Fig. 3 but showing a modified position by movement of the transferrer means. form of theinvention. i As a result, the thread remover is in its down- Referring tothe drawings, I have shown a loom- 30 ward position when the thread is cut at the shutframe l5, breast beam I6 and lay I'l of usual contle eye. struction except for matter to be described here- When the weft being woven is resilient, as in inafter. The lay'has a shuttle box R to receive those types of threads used for the weaving of a shuttle S from which a weft thread-W extends crepe, it has a. tendency because of its elasticity toward the adjacent selvagekof the fabric F. 35 to snap back toward the selvage. It is an impor- 'Ihe reciprocating bobbin magazine 30 may tant object of my present inventionl to provide oscillate about an axis 3| vby mechanism shown means which -Will extend into the path of the for instance in prior Patent No.2,128,9'74. The thread as the latter -moves toward the selvage, magazine includes a transferrer arm 35 movable 40 thereby resisting its motion toward the vcloth and about a pivot 36 when a latch 3l is Struck in the 40 preventing it from moving to such a position as usual manner by forward motion of a dagger 38 would prevent cooperation with the thread reon the lay, thus depressing the transferrer arm mover. This result I may accomplish by placing to effect transfer. A. cutter arm 40 pivoted about a plate on the tube and extending it forwardly a vertical pin 4I carries a cutter blade 44 to cofrom the intake mouth over the deformable maoperate with a plate 45 on the shuttle to sever 45 terial. the weft W on transferring beats of the loom In order that the thread may not snap forat a point near the shuttle eye. wardly out of the range of the thread remover A rod 10 mounted on a carrier 'H pivoted on a I form the thread guard so that the front end fixed stud 12 carries a vertical tube 90 connected thereof projects below the top of the deformable by a hose 9| to anair pump not shownherein 50 material or into the piles of the friction. fabric but similar to that set forth `in co-pending appliextending across the top of the lay and at the cation Serial No. 190,637. 'Ihe tube 90 is held same time may keep the rear part` of the guard in a head 82 on the forward end of rod 'Hl by a spaced slightly above thefriction material at a set screw Ii, and a roll 83 on the head 82 is point'adjacent to the intake mouth. In this way placed for engagement with a cam 84 secured to 55 the transferrer arm 35. A friction disk 'l5 between disks 'i3 and '14, Fig. 1, holds the tube Si) and rod 'lil against pivotal motion around stud l2 by their own weight and these parts must therefore be acted upon positively in order to effect their movement. A resetting screw 863 on the lay is positioned for engagement with the carrier 'il as the lay approaches back center, While cooperation between the cam Sri and the roll 83 operates to lower the tube 9@ when the transferrer arm descends as the lay approaches its front center position on transferring beats of the loom.

The lay is provided on its upper surface with a transverse slot Sil in which is mounted a mass of deformable material such as pile tufts 6i. A tongue S2 extends diagonally downwardly and forwardly from the bottom of the tube and moves relatively to the pile tufts in a forward direction at a level below the weft thread which floats on the top of the pile tufts as the lay recedes. The bottom of the tube 53 is provided with an intake mouth 53 into which air is drawn for the purpose of attracting the thread. The inrush of air generally occurs during the backward stroke of the lay which also moves the thread in frictional contact with the pile tufts toward the intake mouth 93.

`The matter thus far described operates substantially the same as that set forth in co-pending application Serial No. 190,637 to which reference may be had for a more complete description of the structure and operation of the previously described parts which effect lowering and subsequent raising of the tube 90 and also the general function of the pile tufts 6i. It is thought suincient for present purposes to state that the tube Si] is normally raised and is depressed on a transferring beat of the loom when the lay is at or near its front center position to lower the bottom end of tube 9G toward the pile tufts 5I.

As already stated my present invention relates to guard means to confine the thread to the Zone of influence of the thread remover. It is to be understood that if the weft W is resilient it will tend to snap toward the selvage of the fabric F when severed at the shuttle eye as already described. The thread is sufliciently active toI move itself off the pile tufts and out of the range of 1 influence of the thread remover unless some provision is made to insure its frictional contact with the pile tufts so that the latter can move the thread toward the intake mouth.

In carrying the preferred form of the present invention into eiiect I secure a vertical plate or web 5!! to the bottom of the tube @il and from the lower edge thereof in such a way that when the t'ube 96 is down on a transferring beat that part of the lower edge indicated at 5i in front of and adjacent to the intake mouth S3 is slightly above the tops of the pile tufts di, while the forward part of the lower edge indicated at 52 is low enough to extend into the deformable material below the tops of the pile tufts. By this construction I provide a thread trap the top of which is defined by the surface 55,*the forward end of which is determined by the point at which the guard enters the pile fabricVthe lower part of which `is defined by the tops of the tufts 6 i, and the rear part of which is dened by the tube and parts carried thereby. The thread is therefore effectively restrained as to objectionable lateral or vertical motion.

In the modification set forth in Fig. 5, substantially the whole of the bottom edge 55 of plate 51? extends below the tops of the pile tufts. This edge 55, it will be noted, is above the bottom of the tongue 92, and this relation is also true for the front part of plate 50 in the preferred form.

In operation, the thread will extend from the selvage across the pile fabric and into the shuttle box as indicated in Fig. 2 immediately before a transferring operation of the loom. When the transferrer arm descends it moves the tube down so that the guard will occupy a position over the thread as indicated in Fig. 3. In the preferred form the thread will ordinarily lie under the bottom edge 5l and be trapped between said edge and the pile tufts. When the lay reaches front center the thread cutter will sever the thread and the free end of the latter will immediately snap toward the selvage because of its inherent resilience. In the preferred form the thread trap is so narrow that the thread will have difficulty in moving through it without engagement with the plate 5t and the latter will therefore obstruct movement of the thread toward the selvage. The edge 5i will be low enough to prevent substantial upward motion of the thread away from the pile tufts and the latter will ordinarily have sufiicient contact with the thread to move the latter toward the intake mouth and the tongue during the succeeding backward motion of the lay.

In the modified form of the invention the bottom of the plate 54 will press the thread into the pile tufts a short distance sufficient to form a slight bight in the thread. This bight or crimp operates effectively to prevent motion of the thread away from the pile tufts, without interfering with the tractive force exerted pneumatically on the thread.

In both forms of the invention I iind that the thread is restricted in its upward motion away from the pile tufts and in its relative forward motion away from the intake mouth, and that in both forms the guard plates snub or check motion of the free end of the thread toward the selvage.

It is to be understood that the forward motion of the lay andthe descent of tube 90 are coordinated in such a way as to cause the guard to move down on the thread after the latter has been moved forwardly by advance motion of the lay to a position under the guard. vAs already described, the tube 90 will be raised on the following back center position of the lay and therefore have no contact with the threads extending from the selvage into the shuttle box on non-transferring beats of the loom. The sweep of the lay is such that it will reach a position sufficiently behind the tube 9B at the time of picking to allow the shuttle to pass behind the tube without conict therewith.

In the foregoing description I have stated that the thread has a tendency because of its inherent resilience to move toward the selvage at the time of cutting. If the thread is not pinched between the shuttle and the binder this tendency asserts itself immediately after cutting and the thread will snap toward the selvage while the lay is on front center position. If, on the other hand, the thread is pinched between the shuttle and the binder it is not released until the time of picking, at which time the tendency of the thread to recoil on itself and move toward the selvage is asserted. Under the latter conditions the thread will normally be nearer the intake mouth than is the case when the thread is released while the lay is on front center, but I have found that a resilient thread which is not released until the time of picking will nevertheless be active enough to tend to spring to a position out of the range of the thread remover. My invention is therefore effective whether the thread is released either at transfer or picking.

From the foregoing it will be seen that I have provided a thread control for a pneumatic thread remover or extractor which acts to nullify the tendency of the thread to move out of the range of the thread remover because of its inherent resilience. It will further be seen that the thread guard not only resists longitudinal motion of the thread toward the selvage but also limits upward motion of the thread and furthermore cooperates with the pile tufts to limit forward motion away from the intake mouth. It will further be seen that my invention will operate either with a narrow thread trap immediately above the pile tufts as shown in the preferred form of the invention or by means of the modified plate 54 which sinks the thread a short distance below the tops of the pile tufts.

-I-Iaving 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 thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top of the deformable material and having an intake mouth, the deformable material moving the thread by frictional contact therewith toward the intake mouth as the lay moves rearwardly, and means extending forwardly from the thread extractor over the thread to prevent the latter after cutting from moving upwardly away from the deformable material.

2. In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent selvage, a mass of deformable material extending across they top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the to-p of the deformable material and having an intake mouth, the deformable material moving the thread by frictional contact therewith toward the intake mouth as the lay moves rearwardly, and means extending over the thread and below the top of the deformable material at a point spaced from and in front of the tongue to prevent the thread after cutting from moving upwardly away from the deformable material.

3. In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top .of the deformable material and having an intake mouth, the deformable material moving the thread by frictional contact therewith toward the intake mouth as the lay moves rearwardly, and a thread guard extending over the deformable mal terial forwardly from the intake mouth to prevent the thread after cutting from moving upwardly away from the deformable material.

4. In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent'selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the threadat a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top of the deformable material and having an intake mouth, the deformable material moving the thread by frictional contact therewith toward the intake mouth as the lay moves rearwardly, and a thread guard extending into the deformable material at a point in front of the intake mouth, said guard having a -portion between said point and the intake mouth above the deformable material, the guard preventing motion of the thread forwardly with respect to the deformable material to a position in front of the guard and also preventing motion upwardly away from said deformable material. y

5. In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent selvage, a mass of deformable material extending across the top of lthe lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top of the deformable material and having an intake mouth, the deformable material moving the thread by frictional contact therewith toward the intake mouth as the lay moves rearwardly, and a thread guard having a portion adjacent to the thread extractor above and out of contact with the deformable material and having another portion spaced forwardly from the intake mouth andl extending below the top of the deformable material, said guard preventing substantial upward displacement of the thread away from the deformable material.

6. In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top of the deformable material and having an intake mouth, the deformable material moving the thread by frictional contact therewith toward the intake mouth as the lay moves rearwardly,

. and mea-ns projecting forwardly from the thread extractor and extending below the top of the deformable material to form with the latter a trap for the thread in front of the intake mouth,

'7. In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends tothe adjacent selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top of the deformable material and having an intake mouth, the deformable material moving the thread by frictional contact therewith toward the intake mouth as the lay moves rearwardly, and a vertical plate projecting forwardly from the thread extractor above the deformable material and projecting below the latter at a point spaced from and in front of the intake mouth to prevent the thread after cutting from moving upwardly from said deformable material.

8, In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top` of the deformable material and having an intake mouth, the deformable material moving the thread by friotional contact therewith toward the intake mouth as the lay moves rearwardly, and a thread guard above the deformable material extending transversely of the thread to engage and resist motion of a resilient weft thread tending to move toward the selvage after cutting.

9. In a thread control mechanism for a loom having a lay provided with a shuttle from which l a thread extends to the adjacent selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a tongue extending below the top of the deformable material and having an intake mouth the deformable material moving the thread by frictional Contact therewith towardthe intake mouth as the lay moves rearwardly, the thread being resilient and tending to move toward the selvage after being cut, and a guard extending above but close to the deformable material and ,forwardly from the intake mouth to resist said motion of the thread toward the selvage by engagement of the thread with the guard.

Y 10. In a thread control mechanism for a loom having a lay provided with a shuttle from which a thread extends to the adjacent selvage, a mass of deformable material extending across the top of the lay under the thread, means to cut the thread at a point beyond the deformable material with respect to the selvage, a pneumatic thread extractor having a-tongue extending below the top of the deformable material and having an intake mouth, the deformable material moving the thread by frictional Contact therewith toward the intake mouth as the lay moves rearwardly, the thread beingv resilient and tending to move toward the selvage after being cut, and a guard extending forwardly from the intake mouth and having a portion above the deformable material adjacent to the mouth and having another portion projecting below the top of the deformable material at a point spaced forwardly from the mouth, said guard including a vertical plate extending transversely of the thread, said guard and deformable material forming a trap to prevent movement of the thread upwardly from the deformable material and limit forward movement of the thread away from the mouth, and the vertical plate tending to resist motion of a resillent thread to move toward thev selvage after cutting.

CLIFFORD DARWIN.

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