US3408014A - Yarn traversing mechanism for textile machine - Google Patents

Description

Oct. 29, 1968 D. J. FISHER, JR 3,408,014

YARN TRAVERSING MECHANISM FOR TEXTILE MACHINE Filed March 28, 1966 INVENTOR. DANIEL J. FISHER JR.

ATTORNEYS United States Patent 3,408,014 YARN TRAVERSING MECHANISM FOR TEXTILE MACHINE Daniel J. Fisher, Jr., North Kingstown, R.I., assignor to Leesona Corporation, Warwick, R.I., a corporation of Massachusetts Filed Mar. 28, 1966, Ser. No. 537,927 2 Claims. (Cl. 24243) ABSTRACT OF THE DISCLOSURE This application discloses a scattering device for use in a yarn package winding machine. A ratchet-driven eccentric is interposed in the traversing mechanism for the yarn guide of the winding machine. A pawl is slideably mounted adjacent to the ratchet to traverse with it in a reciprocating fashion. Stationary means are mounted in such relationship to the pawl as to intercept the pawl and thereby prevent it from moving through a portion of each cycle of the reciprocation which the traversing mechanism is undergoing. This interception causes the pawl to index the ratchet and thereby rotate the eccentric to change the position of the yarn guide relative to the driving mechanism imparting the reciprocating motion. This in turn scatters the location of the ends of each layer of yarn deposited upon the package. A spring returns the pawl to its original location on its slideable mounting after each interception.

This invention relates generally to textile machines and, more specifically, to a textile machine of the type in which the yarn is traversed back and forth along the length of a take-up package by means of a reciprocating yarn guide.

In the following specification and claims, the term yarn is employed in a general sense to apply to all kinds of strand materials, either textile or otherwise, and the designation package is intended to mean the product of the winding machine, whatever its form.

In the production of cross-wound packages, particu larly those formed on a so-called stretch-yarn machine subsequent to the successive operations of heating the yarn and applying a false twist thereto, it is desirable to prevent the occurrence of high ends. The latter term refers to those ridges of yarn which develop at the ends of a package because a proportionately larger amount of yarn is deposited at the end portions than at the intermediate locations. This condition is usually due to the nature of the operation of traverse mechanism.

High ends are undesirable, especially in packages wound with stretch yarn because they result in packages having ends of higher density than intermediate locations. Also, high ends tend to cause trapping of the yarn during over-end delivery due to rolling or migrating of the crest of the knuckle or high end portions. Further, high ends aggravate the tendency of a strand of yarn to engage or latch other strands of yarn during over-end delivery by reason of the continuous rubbing of the yarn across the high end.

Basically, the invention resides in the placement between the traverse drive and the yarn guide of a device which periodically superimposes a motion to the traverse bar which at one end of the package is either additional to or subtractive from the standard motion imparted thereto by the traverse drive. That is to say, each subsequent stroke of the yarn guide longitudinally of the package being wound is identical in length to the previous stroke although ensuing strokes are offset or staggered with respect to preceding strokes so as to allow the yarn delivered near the end at the traverse stroke to be "ice better distributed and thus equalize the density and diameter of the package. An eccentric device which will be fully described subsequently in the detailed description of the invention is so designed that each successive offset is either greater in length or less than that of the previous stroke. Thus, rather than over-lapping one another, the strands of yarn lie adjacent to one another at the package end and form a smooth package having an improved profile.

It is therefore an object of this invention to provide a device which will prevent the occurrence of high ends on a yarn package being Wound.

Another object of the invention is the provision of a device which will alter the limits of the yarn guide or successive passes across the surface of the package being wound.

A further object of the invention is the provision of an eccentric device located between the traverse drive and the yarn guide to provide a wound package having a substantially uniform and even profile.

Other and further objects will become apparent upon a reading of the description which follows, taken together with the accompanying drawings, in which like numbers refer to like elements throughout.

In the drawings:

FIG. 1 is a front elevation view of a portion of a winding machine employing the invention;

FIG. 2 is an enlarged front elevation view showing in detail the scattering device comprising the invention herein, in a different position than in FIG. 1, and with parts broken away and removed for clearer illustration;

FIG. 3 is a top plan view of thedevice illustrated in FIG. 2; and

FIG. 4 is a schematic showing of the typical movement imparted to the yarn guide of a winding machine modified to employ the invention.

Referring now to FIG. 1 0f the drawing, a package in the winding state is seen at 10, its core C being suitably mounted for rotation on a rotatable shaft 12. A drive roll 14, whose surface is composed of cork or other material having a high coefficient of friction, is rotatably mounted on drive shaft 16 and is in driving engagement with package 10. The package 10 is spring biased against drive roll 14 by means not herein illustrated. Shaft 16 is connected with a suitable power source which serves to drive this shaft.

A yarn guide 18 is positioned in close proximity to the take-up roll or package 10. The yarn guide 18 is fixed on a traverse bar 20 and is moved in response to reciprocation of said traverse bar from a position adjacent one end of package 10 to a position adjacent the other end thereof. To this end traverse bar 20 is connected to a bellcrank 24 through the scattering device 22. Reciprocatory motion is imparted to bell-crank 24 by means of a follower 28 fixed to bell-crank 24 and riding in groove 30 of a cam 26. Bell-crank 24 is guided in its 'back-and-forth movement by instrumentalities not shown and forming no part of the present invention.

Turning now primarily to FIGS. 2 and 3 illustrating scattering device 22 in greater detail, a bearing block 32 is seen attached at one of its ends to traverse bar 20, a nut 34 securing the two elements together in a snug fashion. Fixed to bearing block 32 as by screws 36 is a yoke member 38 having a pair of upright, spaced-apart ears, 40 and 42, which are apertured to receive a pawl mem! ber 44 for horizontal sliding movement and vertical movement on ear 40. A spring 46, whose purpose will be subsequently described, is fastened at one of its ends to pawl member 44 by a screw 45. The opposite end of the spring is connected to upright car 42. A stub shaft 48 is rotatably received in bearing block 32 and an eccentric portion 50 of the stub shaft 48 is exposed through a slot 52 formed in the bearing block.

A link 54 connects the eccentric portion 50 of stub shaft 48 to bell-crank 24, the link being fastened to the bellcrank as by a stud 56. Ratchet wheel 58 having a plurality of serrations or notches 59 around the periphery thereof is keyed to an end of shaft 48 which projects beyond the confines of bearing block 32 and is hel din place by means of bolt 60 which is threadedly fastened thereto. A plurality of pockets or recesses 61 of suitable shape are formed on the surface of the ratchet wheel adjacent bearing block 32. The recesses 61 are spaced at equal radial distances, one pocket or recess for each notch formed in the ratchet wheel. A spring 62, positioned in a socket 64 urges a ball 66 into engagement with one of said recesses 61. The resiliency of the spring 62 permits disengagement of the ball from any recess 61 upon rotation of the ratchet wheel until the next recess moves into position to receive the ball therein.

An operating rod 68 is supported on structural portions of the machine by means not illustrated and receives a slide member 72 apertured for sliding engagement thereon. The slide member 72 is fastened to link 54 by means of bolt 74 with said slide member 72 being engageable with a stop member 70 which is fixed on rod 68 in response to motion from bell-crank 24. Said rod 68 may be a portion of a known buffer mechanism which acts to control deceleration of the traverse rod 20.

A restraining member 76 which may consist of a spacer sleeve 77 secured to stationary structural element 78 of the machine is positioned for engagement by the end of pawl member 44. Thus, it will be seen that rightward movement of scattering device 22 from the position shown in FIG. 1, after contacting engagement of member 76 by the end of pawl member 44 will cause extension of spring 46 as the pawl member slides through the apertures in yoke 38 to the position shown in FIG. 2.

The significance of the structure just described will be made evident from the following account of the inventions operation. The phenomenon of high ends, it will be recalled, is caused by the inherent nature of the traverse mechanism and refers to those ridges of yarn which develop at the ends of a package for the reason that a proportionately larger amount of yarn is deposited at the ends than at the intermediate locations. It follows that the diameter of the package grows more rapidly and said package is more densely wound at the ends than elsewhere.

The device disclosed herein interrupts the synchronism between the take-up roll and the yarn guide at the ends of the roll so as to cause staggering of the yarn lays, thus avoiding the undesirable condition of high, dense ends. Referring again to FIG. 1, it will be appreciated that if scattering device 22 is assumed to be replaced by an extension of traverse bar 20, the reciprocation of hellcrank 24 upon rotation of cam 30 will be imparted to yarn guide 18 via traverse bar 20. Under this assumption, the identical stroke length of bell-crank 24 is imparted to the yarn guide again and again whereupon the reversal points of the yarn will be identical.

By reason of scattering device 22, however, the reversal points of traverse bar and, hence, yarn guide 18 are varied at each reversal. Thus, each time the yarn guide approaches the right hand end of package roll 10, the end of pawl 44 strikes member 76 and its movement is terminated, even as block 32 and all elements fixed thereto continues to move. In this manner, upright cars 40 and 42 slide along pawl member 44 serving to extend spring 46. Ratchet wheel 58 moves into engagement with the pawl and is rotated a circumferential distance equal to the pitch of one tooth. As the ratchet wheel is rotated, ball 66 is urged against spring 62 as it moves out of its first associated recess and is then biased by the spring into the next recess whereby the wheel is arrested against further rotation until the next stroke of bell-crank 24. When the block 32 is returned to the position shown in FIG. 1, the pawl 44 rides over a serration 59 and lifts in its slot in car 40. This intermittent rotation of the ratchet wheel rotates stub shaft 48 and eccentric 50 thereon which effects a change in the distance between bell-crank 24 and the yarn guide. With the stroke of yarn guide 18 across the surface of take-up package 10 thus continually altered, the tendency of the yarn being wound to build higher at the ends thereof rather than in the central regions is obviated. Hence, with the reversal points scattered the result is a package smooth from one end to the other and having a uniform density.

FIG. 4 illustrates, in a greatly exaggerated manner, a typical positioning of successive strokes a, b, and c of yarn guide 18 across the surface of winding package 10.

Therefore, there has been disclosed herein a device, heretofore unknown, which will prevent the occurrence of high ends and which will assure the formation of a package having uniform density throughout. In this manner, there will be no tendency for yarn breakage or sloughing upon a redraw operation; further, the package Will be of a superior uniform density, highly suitable for a subsequent dyeing operation.

While a specific embodiment of the invention has been shown and described, it should be understood that the same is merely for the purpose of illustration and that changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the appended claims.

What is claimed is:

1. In an apparatus for winding a yarn package having opposite ends, said apparatus comprising guiding means operable for engaging and advancing strand of yarn and traversing the strand to and fro axially from end to end of said package to wind a plurality of yarn layers thereon,

linkage means mounted for reciprocating movement and having a first part and a second part,

said first part being connected with said guiding means for moving the guiding means to and fro responsive to reciprocating movement of the second part to and fro,

traversing means connected with said second part of said linkage means for reciprocating said second part to and fro,

and an end positioning mechanism between said parts operable to vary the spacing between said parts for axially varying the position of opposite ends of successive layers of yarn on the said package, said mechanism comprising an eccentric crank rotatably mounted on said linkage means and operably connecting said first and second parts thereof, operating means for rotating said crank step by step in one direction comprising a ratchet wheel, means mounting said ratchet wheel for rotating said crank, pawl means to rotate said ratchet wheel, and means responsive to the operation of said traversing means for operating said pawl to rotate said ratchet wheel step by step, the improvement wherein said means responsive to the operation of said traversing means includes means for slideably mounting said pawl on said linkage means for reciprocation therewith,

stationary means mounted to intercept said pawl and thereby prevent said pawl from completing a portion of each cycle of its said reciprocation with said linkage means, causing said pawl to slide with respect to said linkage means and to actuate the rotation of said ratchet wheel,

and spring means opposing the said sliding motion of said pawl.

5 6 2. The apparatus of claim 1 further comprising spring- 2,433,304 12/ 1947 Stream 24243 loaded ball detent means to prevent the rotation of said 2,611,549 9/1952 Kinsella 24226.3 ratchet wheel other than as actuated by said pawl. 2,737,352 3/1956 Kernan 242-261 R f C1 d 2,922,591 1/ 1960 Hope 242-26.3

e W 5 FOREIGN PATENTS UNITED STATES PATENTS 612 1903 Great Britain. 1,503,441 7/1924 Woodcock et a1 242---43.1 1,770,397 7/ 1930 Furness 24226.2 STANLEY N. GILREATH, Primary Examiner.

2,338,722 1/ 1944 Jackson 242-43

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