US2303353A - Device for use in winding rayon - Google Patents

Description

Dec. 1, 1942. D. GROSS v DEVICE FOR USE IN WINDING RAYON Filed Feb. 10, 1940 Jam/d1: 6mm:

Patented Dec. 1, 1942' UNITED STATES, PATEN OFFlCE DEVICE For; USE IN WINDING RAYON poration of Delaware Application February 10, 1940, Serial No. 318, 353 (c1.91-13) 4 Claims.

This invention relates to the treatment of yarn, thread or the like in its passage between a thread storage. device and a collecting device and more particularly to treatments wherein succeeding portions of a yarn, thread or the like are passed in contact with a surface which will modify its characteristics. e

While yarn or the like may be subjected to the modifying influence of many varying types of materials, liquid or solid, involving such operations as abrading, waxing, lubricating, etc, by passage across a suitably prepared surface, it will be recognized that regardless of the type of treatment to be efiected it is highly desirable that the yarn or the like be modified substantiallyuniformly throughout its length.

An appreciation of typical difliculties which have been encountered in the treatment of yarns by passing the same across a prepared surface may be had by a consideration of the problems encountered in the preparation of wound cones for use in the manufacture of knitted fabrics such as underwear, tubing and hosiery. Since such cones are customarily used by the manufacturers yarn is to be put." The roller is driven at a constant speed and turns counter-current to the direction of yarn travel, thus continuously presenting a uniformly coated surface to the yarn.

As has been pointed out above, it is highly de-" sirable not only that a suitable amount of lubricant be imparted to a given length of yarn but also that such amount be applied uniformly for the entire length of the yarn. This isjdifllcult of accomplishment by the employment of conventional machinery because of the fact that the yarn take-up steadily increases as the driven cone increases in diameter while the roller is driven at a constant speed so that the time of contact of the yarn with the roller proportionally decreases as the winding operation progresses. An attempt has been made to obviate this difilculty by the use of a device for progressively guiding the yarn across the roller at an increasing angle as the cone diameter increases, thus compensating for loss of contact time by the provision of a through knitting needles without danger of breakage. Furthermore, the good appearance of the knitted fabric is-to a large extent dependent upon the amount of lubricant accepted by the yarn and the evenness of its distribution 'over succeeding portions thereof. In furnishing yarns to be used in knitting operations, it isnecessary therefore that the entire length of yarn be uniformly lubricated to an extent within critical limits so that the knitting operation may progress eillciently while the finished product will have longer path of contact.

While the use of the guiding device outlined above has resulted in some improvement as-regards the maintenance of uniformity of application of lubricant to succeeding portions of yarn, it has been noted-that the amount oflubricant accepted by the yarn during that period when 'the cone is being started, and consequently its take-up is near the minimum, is generally higher' than the desired, amount and that at this stage the application of lubricant to succeeding portions of yarn lacks uniformity. .By experiment it has'been determined that the initial non-uniformity and over-coating results from insufllcient tensioning of the yarn passing to the roller, the peripheral speed of the collecting device being relatively low, such lack of tension resulting in undesirable vibration of the thread in its path between the. storage device and roller. The vibration causes the surfaceco'ntact between the yarn and roller to vary considerably with the result that the amount of lubricant accepted by the yarn under these conditionsis higher than desired and less uniform. Incident to the vibration additional damage to the yarn may be caused by uneven and excessive tensions due to drag between the yarn and the lubricant. It was furlubricant bath, generally in the form of an emulsion, to a driven collecting bobbin or the 'like.

The roller is so arranged with respect to the lubricant bath as to pick up a film of lubricant of I suflicient thickness to permit the imparting" of a definite amount thereof to the yarn passing thereover, the amount in any instance, of course;

ther discovered that the extent and duration of the vibration is subject to considerable variation when yarns of difierent deniers or other physical characteristics are being wound. On the other hand, at some time during the winding operation it has been found that the peripheral speed of the collecting device and consequently its take-up will increase to a point where the' vibration is stopped and satisfactory lubrication can be effected. This time, of course, will depend upon the characteristics of the yarn, winding speed and other variables.

It is'an object of this invention to overcome all of the difliculties heretofore encountered in Guide I4 is attached to a sleeve 22 which is axially movable along a shaft 23, this movement controlling the pith of yarn l0 across roller l3.

templated that yarn treated by contact with a modifying surface during a winding operation will be automatically maintained in proper relation to such surface regardless of the speed of travel of the yarn, the condition of the surface,

the physical and/or chemical characteristics of the yarn itself or the ty e of treatment efiected by contact thereby rendering available a modified yarn of great uniformity throughout its entire length.

It is further contemplated by the use of th s invention to damp the vibrations of yarn or the like being drawn between a, storage device and a treating surface at such times as,the normal tension of the yarn is 'insuifficient for this purpose to thereby permit uniform treatment of succeeding portions of yarn contacting a treating surface while avoiding uneven and excessive tensions incident to drag between the yarn and treating surface.

Further objects and advantages of the present invention will be apparent from a consideration of the following detailed description of a preferred embodiment thereof taken in conjunction with the annexed drawing wherein:

Figure 1 is a view in front elevation of a portion of a winding machine showing a preferred form of the vibration damping device of the present invention in damping position;

Figure 2 is a detail view of the damping 'device in released position; and

Figure 3.is a view in section taken along the line 33 of Figure 1.

Referring to the drawing in further detail, the invention is shown in a machine adapted to receive yarns or the like ID from a suitable source not shown which maybe a spool, cake or the like, which yarns are to be treated with aliquid dressing such as a lubricating emulsion and are to be wound into the form of cones 0r cops.

Inasmuch as the machine is adapted to simultaneously treat and wind a plurality of yarns by identical mechanism, the. description will be confined for convenience to the mechanism acting upon a single yarn. It is understood, however, that any number of such mechanisms may be included in the machine and may be operated simultaneously.

Thread l0 taken from its source is passed through stationary pigtail guides II and I2, tangentially across a roller l3, through an additional pigtail guide [4 and a tensioning'device I5, of well known form, to a traverse mecha-.

nism l8 through which it is drawn by cone or 0D l1 mounted for rotation with a shaft I3 driven at constant speed from a source of power not shown. V

Roller I 3, across which the thread It passes in its travel between the source and cop I1, is mounted for rotation with shaft l9 which is driven from a source of power'not shown. Shaft I9 is so journaled that roller l3 will rotate partially below the edge of longitudinally extending tank or trough which is partially filled with a suitable lubricatingemulsion 2|; Conveniently awall of trough 20 constitutes a support for guides II and I 2.

The movement of sleeve 22 is eifected automatically so that the length of the path of the yarn in contact with the roller is increased as the speed of take-up increases due to increase in effective diameter of the cop ll. cellent known mechanisms for effecting this automatic adjustment and since such adjustment is not a part of this invention further reference thereto is deemed unnecessary.

Traverse mechanism I6 is of conventional form and includes a guide member for causing the yarn to be wound on the cop in a series of helices. The guide member is mounted on a cone surface contacting member 24 which in turn is arranged for pivotal movement about shaft 25 in response to variations in the effective diameter of the cop. One of the many well known means for maintaining member 24* in contact with the body of wound yarn is employed.

In the path of yarn I0 between guides H and i2, there is interposed a damping mechanism indicated generally by reference numeral 26. The

damping mechanism includes a flat plate 21 attached by bolts 28 to the front of tank 20 and an arcuate member 29 lying in a plane at right .II and I2. While plate 21 and arcuate member 29 are. preferably integral it is desirable'to cut a notch in the plate before or after deformation, thereby providing a recess 30 between arcuate member 29 and plate-21. A brake shoe mechanism including an arcuate member or shoe 3.l presenting a convex surface to member 29 and a depending arm 32 lying in recess 30 constitutes another part of the damping device 26.. Arm '32 is provided with a longitudinal slot at 33 and is attached to plate 21 only through spring 34 which normally urges 'shoe 3| against member 29. bell crank 36, the lower arm 31 of which carries a pin 38 which is received in slot 33 of arm 32. The other arm 39of bell crank 36 is provided with a series of spaced holes 40 through which a pin 4| is passed forefiecting a connection between arm 39 and a rod 42 which depends vfrom traverse mechanism I6 to which it is Divoted at 43. Rod 42 is provided with a series of holes 44 adapted to overlie holes 40 in the bell crank arm 39 and to receive pin 4|, thus permitting an adjustment of the effective lengths of both rod 42 and arm 39. I

ing of a cone or cop thereon. This movement of traverse mechanism "5 will cause shaft 42 to move down rocking bell crank 36 about its axis at thus causing the lower arm- 31 of the bell crank to progress in an arcuate path until pin 38 has moved through slot 33 and strikes against arm 32 thereby moving brake shoe 3| against the action of spring 34 to the position shown in Figure 2. Thereafter, the device is threaded 'up by passing yarn from the storage device through guides II and 12, across roller l3, through guide l4, tensioning device l5 and traverse mechanism I6. to the cop or cone H to which the end is attached.- Traverse mechanism I6 is now moved into contact with cop II, this causing the bell crank 36 to again rock about its axis 35 thus disengaging pin 33 and arm 32 permitting spring There are several ex-' Pivoted to supportingplate 21 at 35 is a 1 Figure '2.

contact with'said 34 to urge shoe 3| against-arcuate member 23 so thattheyarnllwillbecausedtopassinan arcuate path between guides II and l 2 when shaft lliscausedto rotate. Whenthe cop llkdrawing yam II from its source through the various guides, shaft I3 and consequently roller I3 is caused to rotate in a direction coimtercurrent to the path of travel of the yarn. Thus the lubricant I] is picked up by the roller and imparted totheyamatthepointofcontact. Duringthe initialofthewindingyarnllwillbe passedbetweenmembers 23 and 3| the'two being urged together by the actionof spring 34. -As

winding p, however, traverse mechflle anism will be moved away from shaft II by the increasing yarn body on cop I], thus pivoting about point 25 and moving shaft 42 downward. This action will be-imparted to bell crank 38 through connecting pin 4| 'so that lower arm 31 and pin 33 will move, the'latter gradually taking up the lost motion provided by slot 33. At some asoasts 2. In a winding machine, a source of yarn, thread orthe like, a driven collecting device, meansin the path of said yarn intermediate said source and said device for contacting said yarn with a lubricating surface, vibration damping means comprising a movable member initially in contact with, and normally operable on, said yarn in its path between saidsource and said contacting means, and means responsive to a change in thickness of the yarn body on the collecting device for withdrawing said movable member stage in the'building of the cone, determinable by the length of slot 33 and the adjustment bet tween rod 42 and bell crank 36, pin 33 will engage arm 32 and gradually move shoe 3| away from,

the concave face of member 29 thus permitting the yarn path between guides II and i2 to straighten. Since the vibration which causes uneven coating of the yarn exists only when the tensionontheyarnislow,itwillbeseen that damping mechanism 26 will operate when needed while an automatic release thereof "is effected by the very factor which increases tension, the

diameter of the cop and wound yarn body thereon I v i It will be clear that at the beginning of the winding operation pin 38 will be at the left side ofslot33asshowninFigure1sothatduring the initial winding of the cone or cop l1 pin 38 will move gradually to the right without eilecting any movement of arm 32 against the urging of spring 34, As soon as the pin engages the portion of the arm defining the t-hand end of slot 33 the arrn and shoe will be gradually moved out of damping position to the position shown from contact with said yarn, said last named means including a traverse mechanism in pivtal association with the yarn body and eflective to move the damping means, through a linkage connection.

3. In a winding machine, a source of yarn, thread or the like, a driven collecting cop,.a traverse mechanism contacting said collecting cop and movable in response to increase in diameter. thereof 'as succeeding portions of yarn are wound thereon, means in the path of said yarn intermediate said source and saidcop for contacting said yarn with auniiormly coated lubrieating surface, vibration damping means operable on said thread in its path between said source and said contacting means, said damping means including a fixed memberand a movable ltwillbeapparentthatthestageinthewind-j ing at which the release of damping mechanism 26 is to be effected will vary considerably dependent upon the size of the cone, the denier of the yarn and other variables. However, by adjustment of the effective length of rod 42 and bell crank arm 33 any required lost motion between arm 32am! pin 33 is attainable thereby permitting a uniform treatment of-a wide'range of ,I

The above description ofa preferred embodiment of this invention is but for of iilustration and it is not intended that the scope of the invention be limited beyond the spirit of the appended claims.

I claim! p 1.Ina windingmachine,asource.of yarn,

thread orrthe like, a driven collecting device, means in the path-of said yarn intermediate said source and said device for contacting said yarn with a treating surface, vibration damping-means ber duringinitial movement of the traverse mechanism.

4. In a winding machine, a yarn source, a driven collecting ;device. a traverse mechanism contacting'the yarn body on said collecting device and movable thereby, a trough adapted to contain a lubricant, said trough being positioned adjacent the'path of said yarn intermediate said source and said device, a driven roller in said trough adapted to operate partially submerged in said lubricant, guiding means for directing the yarn in a tangential path across said roller to be, lubricated, and a vibration damper interposed in the path of said yarn intermediate-said source and said roller'comprising, a fixed support including a braking surface, a shoe operable upon said surface and having a slotted depending portion, said shoe and said surface defining an arm!- ate path for the-thread therebetween, a spring attached to said depending portion and normally comprising a movable member initially in con- 1 tact with, and normally operableon, said yarn in its path between said source and said contact- -ing means, and means responsive to-a change inthickness oftheyarn body on the-collecting de-' vice for withdrawing said movable member from urging said shoe in the direction of said surface, a bell crank pivoted to said fixed support and having a pin on one arm engaged in the slot of said depending portion, a crank arm attached to said traverse mechanism and movable there by, means for effecting an adjustable connection between said crank-arm and the other arm of .said bell crank, whereby the free movement of the pin in the slot may be adjusted to predetermine when the movement of the-crank will begin thereleaseoftheshoe. 1

I. GROSS.

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