US2554670A - Yarn-advancing reel - Google Patents

Description

4 Sheets-Sheet l Vv E N R O U A INVENTOR.

ALVIN L. EWING A. L. EWING YARN-ADVANCING REEL May 29, 1951 Filed Jan. 1o, 194e May 29, 1951 A. L. EWING 2,554,670

YARN-ADVANCING REEL Filed Jan. lO, 1946 4 Sheets-Sheet 2 INVENTOR.

ALVIN L. EWING ATTORNEY ay 29, 1951 A. L. EWING YARN-ADVANCING REEL 4 Sheets-Sheet 5 Filed Jan. l0, 1946 FIGo INVENTOR.

ALVIN I.. EWlNG @wif/,4%

ATTORNEY May 29, 1951 A. L. EwlNG 2,554,670

YARN-ADVANCING REEL v Filed Jan. 1o, 1946 sheets-sheet 4 INVENTOR.

ALVIN L. EWING By (L:

ATTORNEY Patented May 29, 1 951 YARN-ADVANCING REEL Alvin L. Ewing, Richmond, Va., assignor to E. I.

du Pontde Nemours' & Company, 'Wilmingtom Del., a corporation of Delaware Application January 10, 1946, serial No. 640,231

1.3 Claims. 28-7L6) This invention relates to yarn-advancing ap paratus, and more particularly to a yarn-advancing reel in which yarn is continuously and progressively advanced in the form of a helix.

An object of this invention is to provide a new and improved yarn-advancing reel for continuously advancing yarn in the form of `a helix.

Another object of this invention is to provide a yarn-advancing reel of a relatively simple construction and having relatively few moving parts.

A further object of this invention relates to a yarn-:advancing apparatus which can be readily removed and replaced in a machine.

Other and additional objects will appear hereinafter.

The objects of this invention are accomplished,

in general, by winding yarn in the form of a helix onto ya reel having two sets of yarn-supporting bars rotating with the reel, the bars of one set being fixed with respect to axial and radial movement and disposed alternately between the bars of the other set which are movable radially and axially of the reel, and imparting radi-al in-andout motion and axial reciprocation to the movable bars whereby the yarn is continuously and smoothly advanced along its length, the radial in--and-out movement and :axial reciproc'ation of the movable bars being accomplished by a cam mechanism.

In one embodiment, the movable and fixed bars are so positioned that normally a yarn wrapped around the reel cont-acts the fixed bars in :a zone constituting approximately one-half of the reel while resting on the movable bars in a zone constituting approximately the other half of the reel. By a cam mechanism, the movable bars are radially receding the movable bars, onto bars at the neutral position. By repetition of the cycle, the yarn is continuously advanced in a ,I helix over the reel.

The present invention will be more easily understood by reference to the following detailed description -when taken in connection with the accompanying drawings, in which:

Figure 1 is a longitudinal vertical section of a yarnadvancing reel taken along lines I--l of"4 Figure 3, constructed in accordance with the invention;

Figure 2 is' a section Figure 1;

Figure 3 is a section taken on the line 3-3 of Figure 1; and

Figure 4 is a section taken on the line 4-4 of Figure 1. f

Referring to the drawings, wherein like refer ence numerals designate like parts, the reference numeral Il] designates the main shaft of the reel and is rotatably supported adjacent its ends inoutboard bearings I2 :and I4 appropriately mounted in the machine. An end plate I6 positioned on a sleeve I8 is secured to shaft l0 by means of set screw 20. An end plate 22, disposed caused to successively recede radially Y'on ap-vv proximately half of the reel and expand radially on approximately the other half of the reel; The cam surfaces are so shaped that at the point where the xed and movable bars :are in neutral position, i. e. saine radial distance from the reel axis, there is no axial movement of the movable bars, but as the movable bars are successively retracted radially from this point the cam causes them to move axially in the direction opposite .to the direction of travel of the yarn over the reel. This axial movement continues until the movable bars again reach the neutral position on the opposite side of the reel. The bars then successively move radially outwardly to contact and carry the yarn free from the fixed bars and also successively move axially in the direction of the yarn advancement to advance the yarn in one direction until the yarn. is again transferred. by

in spaced relationship to end plate I6, is secured to sleeve 24 by set screw 26, the sleeve 24 being rotatably mounted with respect to shaft I0, as will hereafter become apparent.

A set of yarn-supporting bars 30, arranged circumferentially and in spaced relationship, are iixedly secured to end plates I6 Iand 22. Inthef,V form shown, each fixed bar 30 extends longitudinally of thereel andis parallel to the major axis o f the reel. 1

The drives for shaft IU and end plate 22nare,l by equal gears, meshed into one common drive'- gear so that there will be no distortion of the assembly. In the formshown in Figure 1, a gear 34, secured to shaft 36, driven from any suitable source such as from motor R through gearsr S and T, drives gear 38 which is secured by set screw `4l) to shaft I0 whereby rotary motion is i imparted to shaft I0. Since end plate I6 is secured to shaft I0, it will rotate therewith. End plate 22 is provided with gear 44 which is driven by gear 46 also carried on shaft 36. ,l

A set of movable bars 5D are positioned in I,alternate spaced relationship with respect to the fixed bars 30. Each bar 50 is carried at the top of :an individual separate web member 52, the opposite ends of which are mounted for radial and axial I movement, obtained as hereafter explained,"in fixed paths relative to the 'adjacent fixed bars in 3 slots 54 and 56 in end plates I6 and 22 respectively.

Each web member 52 is provided on the bottom thereof, adjacent each side, with a pair of cam followers l60 :and 62. Cam follower '60 cooperates with |cam 64, and cam follower y62 cooperates with cam 66. In the form shown, cams 64 yand 66 are formed of two pieces and the combined cam is designated generally 'by the reference numeral 68.

Cam mechanism 68 are secured to sleeve 10 by set screws 12. A gear 14 iixedly mounted on shaft 16, which is driven in any suitable manner as, for instance, through gears |01, |05, |06 from shaft V of motor R and cooperates with gear '18 secured to sleeve 10 by means 'of key U shown in Figure 1. It is thus apparent that upon rotation of sleeve 10, which is in a direction opposite to that of main shaft I0, cam mechanisms 68 will be rotated in a direction opposite to that of the reel.

Each of cams 64 is of a design so that upon rotation each web member 52 will be reciprocated axially whereby a similar movement will be given to bar 50 carried by such web member. Each of cams 66 is of a design which upon rotation will impart to each web member 52, and hence to movable lbar 50 carried thereby, a radial in-and-out movement.

From the description thus far, it is apparent that, upon rotation of the reel, bars 30 will be moved in a circular path about the main reel shaft but will be xed with respect to any radial or axial movement thereof, whilebars 50 will be movable notI only in a circular path about the main reel shaft I0 but .also radially inwardly and outwardly as well as axially relative to the main reel shaft I6.

Due to the respective movement, bars 30 are herein called fixed bars while bars 50 are called movable bars.

In order to support the movable bars 50 against deflection due to tension set up by theyarn wraps aroundthe reel as well as to maintain rigidity of the bars, each web member 52 is provided at approximately the center of the bottom thereof with a follower 80 which cooperates with eccentric.82 secured to sleeve by set screw 84. The

to the mode of mounting the assemblies for movable bars 50 hereinbefore described, when a yarn is wrapped around the reel it contacts the iixed bars 30 in approximately one-half of the reel while resting on the movable bars 50 in approximately the other half of the reel. As shown in l Figure 2, the yarn rests on the movable bars 50 xed and movable bars in the zones designated by the reference characters C and D hereinafter called neutral zones.v In other words, the movable bars 50 are in .the radially expanded posi-v tion in zone A and in the radially receded position in zone B. During operation, due to the cooperation of cams 66 with cam followers 62 .and eccentric 82 with follower 80, movable bars 50 are caused to move from the radially expanded position in zone A t0 the radially receded position in zone B. The movable bars 50, in passing from zone A to zone B, pass through neutral zone C whereinmovable bars 50 are the same radial distance from the reel axis as fixed bars 30, and

" both bars carry the yarn. The slope of cams 64, y

eccentricity .of eccentric 82 corresponds to the shape of cam 66 and together therewith controls the radial movement of bars 50. The iixed bars 30 are supported intermediate the length thereof by circular vring 85 which allows free movement of movable bars 50.

In the form shown in Figures 2 and 3, the

yarn-contacting surfaces of iixed bars 30 and movable bars `are of the saine cross-section.

The yarn-contacting portion of each of the bars,

in the form shown, consists of two v.spaced semicylindrical projections 90 extending longitudinally of the respective member at the front and rear edges thereof.

The driving mechanism is enclosed in a housing, generally designated by the reference nuwhich controls the axial movement of movable bars 50, is such that, when the xed and movable bars are the same radial distance from the center of the axis as in zone C, the movable bars are lnot moved axially. However, as the bars pass -move out of neutral zone D into Zone A, movable bars 50 are moved radially outwardly t0 contact the yarn .free of the fixed bars, at which timeI the movable bars are moved axially in the direction of feed of the yarn travel. The cycle of operation is continuously repeated.

In the instant reel, as Vthe movable bars move radially outwardly to the greater diameter of the reel, the distance between each movable bar increases slightly and, vice versa, decreases as they return to the neutral position on the opposite side. In such radial movements the movable bars, however, do not move in an angular direcl. tion relative to the adjacent fixed bars. This action more evenly distributes the tension, prevents any concentrated tension differences at the neutral points, and reduces the possibility of slippage of the yarn on the bars at these points. l

The relative rate of rotation between the cams and the reel determines the advancement cycles per revolution of the reel which, in turn, controls the increment of yarn advancement. Though the cams controlling the movable bars were hereinvbefore described as rotating in a direction opposite to the yarn advancement, it is to be understood that the cams can be rotated in either direction or remain stationary. When the cams revolve in the same direction as the reel, the yarn advancement increment is smaller than that obtained when the cams rotate in a direction opposite to the rotation of the reel. When the cams are stationary, the yarn advancement increment is fixed to that of the pitch of the cams. Thus,': by appropriate .relative rates of rotation, any desired, advancement .increment can be obtained.

s When the reelms tapered, it is particularly desirable to have the advancement `increment as small as possible to prevent tension differences inthe yarn wraps.

In the embodiment described, the yarn-carryingwsurfaces of the bars were parallel to the axis of the reel. The inventionl is not restricted thereto since the bars may be taperedvto-increase or decrease the tension on the yarn as it advances along the reel.

As is apparent from the description, the reel is so constructed that by the removal of the outboardbearing l2 andthe loosening lof set screw 20, the-entire reel assembly can be slipped off shaft I0 and a replaceable reel slipped on. This is of obvious advantage especially when repairs have to be made.

The yarn-advancing reel herein described can bel used for the advancement of yarnV alone or while it is being processed by appropriate treating uids. f

.The yarn-bearing surface is made of a material which does not deleteriously affect the yarn and is inert to the yarn-processing liquids if used. It can be made of various materials, such as ceramics, stainless steel, nickel alloys containing a high proportion of nickel, such as those sold by Haynes Stellite Company under the name Hastealloy, etc., depending on the reaction of the processing fluids if used.

The diaphragm 96 serves to seal off the inner part of the reel, and the housing 94 similarly serves for the drive mechanism. By the use of diaphragm 9B, the wearing parts can be constructed of suitably wearing materials which are or are n'ot corrosive-resistant, -The portion of the apparatus extending outwardly beyond the diaphragm 96 is made of non-corrosive material.

The reel isintended to be used preferably when shaft Il)v is in a horizontal position. It can be supported at both ends or at one end by a cantilever support.

The present invention provides a simple, inexpensive and easy-to-operate yarn-advancing apfparatus which is characterized by relatively few moving parts, access to which can be readily had for. the purpose of repairs when necessary.

h Since it is obvious that many changes and modifications can be made in the above-described details without departing from the nature and spirit of the invention, it is to be understood that the invention is not to be limited thereto except as set forth in the appended claims.

I claim: l. A yarn-advancing mechanism comprising a reel .having a central reel shaft, means forrotat- Yi remains the same distance in an angular direction relative to the adjacent fixed yarn-contacting bars, means operative during rotation of. the reel 1 to move successively the movable yarn-contacte ing bars in said fixed path from radially expanded position, where they contact the yarn, to radiallyy receded*` position where they are outv of contact yarn-contacting bars, While in radially expanded; position, axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position, but impart no i: axial movement to said movable bars when theA latterrand the fixed bars-are the same radial distance from the reel axis.

2. A yarn-advancing mechanism comprising a'- reel having a central reel shaft, means for rotatz ing said reel shaft, two sets of yarn-contacting bars mounted to rotate about the center axis of said shaft, one of said sets of yarn-contacting 1 bars being disposed alternately between the yarn- 1 contacting bars of the other set, means fixedly. '.mounting one of ,said sets of yarn-contacting bars against radial and axial movement, means mounting the yarn-contacting bars of the other of said,` sets for axial reciprocation and radial in-and-out i movement from the center of the reel in a fixed path wherein each movable yarn-contacting bar remains the same distance in an angular direction relative to the adjacent xed yarn-contacting bars, cam means operative during rotation= of the reel to move successively the movable yarncontacting bars in said fixed path from radially expanded position, where they contact the yarn, to radially receded position where they are out of contact with the yarn, and cam means to move the movable yarn-contacting bars., while in radially expanded position, axially in the direcsame radial distance' from the reel axis.

3. A yarn-advancing mechanism comprising a reel having a central reel shaft, means for rotating said reel shaft, two sets of yarn-contactingr bars mounted to rotate about the center axis of said shaft, one of said sets of yarn-contacting bars being disposed alternately between the yarn-contacting bars of the other set, means xedly mounting one of said sets of yarn-con- -tacting bars against radial and axial movement,

means to eccentrically mount the other set of yarn-contacting bars relative to said reel shaft# for radial in-and-out movement from the center of the reel in a xed path wherein each movable yarn-contactingv bar remains the same" distance in an angular direction relative to the adjacent xed yarncontacting bars whereby normally said bars in .a zone constituting ap"' proximately one-half of the periphery of the reel vare in radially expanded position and in a zone constituting approximately the other half of the periphery; of the reel are in radially receded position, said eccentrically mounted bars, during rotation of the reel, moving successively in said fixed path from radially expanded position, wherev they contact the yarn, t0 radially receded position where they are out of contact with the yarn, and means to move the eccentrically mounted yarn-contacting bars, while in `radially expanded position, axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded I position.

4.. A yarn-advancing mechanism comprising a reel having a `central reel shaft, means for rotating said reel shaft, two sets of yarn-contacting bars mounted to rotate about the center axis of said shaft, one of said sets of yarn-contacting bars being disposed alternately between A with.the. yarn, andmeansgtomoveA .the m0vab1e375"theyarnecontactingbars of. theother set, means aiutiamo iixedly mounting one of said sets of yarn-com' tasting bars against radial and axial movement, means mounting the yarn-contacting bars of the other of said sets for axial reciprocation and radial in-and-out movement from the center of the reel in a fixed path wherein each movable yarn-contacting bar remains the same distance in an angular direction relative to the adjacent fixed yarn-contacting bars, said means normally positioning the movable yarn-contacting bars in radially expanded position in a zone constituting approximately one-half of the periphery of the reel and in radially receded position in a zone constituting approximately the other half of the periphery of said reel, means operative during rotation of the reel to move successively the movable yarn-contacting bars in said fixed path from radially expanded position Where they contact the `yarn to radially receded position where they are out of contact with the yarn, and means to move the movable yarn-contacting bars, While in radially expanded position, axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position but impart no axial movement to said movable bars when the latter and the fixed bars are the same radial distance from the reel axis.

5. A yarn-advancing mechanism comprising a reel having a central reel Shaft, means for rotating said reel shaft, two sets of yarn-contacting bars mounted to rotate about the center axis of said shaft, one of said sets of yarn-contacting bars being disposed alternately between the yarn-contacting bars of the other set, means xedly mounting one of said sets of yarn-contacting bars against radial and axial movement, means mounting the yarn-contacting bars of the other of said sets for axial reciprocation and radial in-and-out movement from the center of the reel in a fixed path wherein each movable yarn-contacting bar remains the same distance in an angular direction relative to the adjacent fixed yarn-contacting bars, said means normally positioning the movable yarn-contacting bars in radially expanded position in a zone constituting approximately one-half of the periphery of the reel and in radially receded position in a zone constituting approximately the other half of the periphery of said reel, cam means operative during rotation of the reel to move successively the movable yarn-contacting bars in said fixed path from radially expanded position Where they contact the yarn to radially receded position where they are out of contact with the yarn, and cam means to move the movable yarn-contacting bars, while in radially expanded position, axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position, the last named cam means imparting no axial movement to said movable bars when said movable bars and the fixed bars are the same radial distance from the reel axis.

6. A yarn-advancing mechanism comprising a reel having a central shaft, means for rotating said reel shaft, a pair of spaced end plates, one of said end plates being secured to said reel shaft, means to separately rotate the other of said end plates during rotation of said reel shaft, a set of spaced circumferentially arranged yarn-com' tacting bars secured to said end plates, a second set of yarn-contacting bars disposed alternately between the yarn-contacting bars of the first set,

each; yarn-contacting bar of the second-set being" secured to a respective vweb member, means to' rotate said web member during rotation of ysaid reel shaft, means mounting the web members for axial reciprocation and radial in-and-out movement in a fixed path relative tothe adjacent fixed yarn-contacting bars, means operative during rotation of the web members about said reel shaft to successively move said web members in said fixed path from radially expanded position, where the yarn-contacting bars carried thereby are in yarn-contacting position, to raradially receded position where said yarn-contacting bars are out of yarn-contacting position, and means to move the web members supporting the yarn-contacting bars in radially expanded position axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position, but impart no axial movement rto the web members when thebars carried thereby are the same radial distance from the reel axis as the fixed bars.

7. A yarn-advancing mechanism comprising a reel having a central shaft, means for rotating said reel shaft, a pair of spaced end plates, one of said end plates being secured to said reel shaft, means to separately rotate the other of said end plates during rotation of said reel shaft, a set of spaced circumferentially arranged yarn-contacting bars secured to said end plates, a second'set of yarn-contacting bars disposed alternately between the yarn-contacting bars of the first set,

each yarn-contacting bar of the second set being secured to a respective web member adapted to move in a fixed path relative to the adjacent fixed vyarn-contacting bars, means to rotate said web member during rotation of said reel shaft, means eccentrically mounting the web members Whereby during rotation of the Web members about said reel shaft said web members successively move in a fixed path relative to the adjacent iixed yarn-contacting bars from expanded position, where the yarn-contacting bars carried thereby are in yarn-contacting position, to radially receded position where said yarn-contacting bars are out of yarn-contacting po' sition, and means to move the web mem' bers supporting the yarn-contacting bars inv radially expanded position axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position, but impart no axial movement to the Web members when the bars carried thereby are the same radial distance from the reel axis as the fixed bars.

8. A yarn-advancing mechanism comprising a reel having a central shaft, means for rotating said reel-shaft, a pair of spaced end plates, one

of said end plates being secured to said reel shaft,

means to separately rotate the other of said end plates during rotation of said reel shaft, a set of spaced circumferentially arranged yarn-contacting bars secured to said end plates, a second set of yarn-contacting bars disposed alternately between the yarn-contacting bars of the iirst set, each yarn-contacting bar of the second set being secured to a respective web member adapted to move in a fixed path relative to the adjacent fixed yarn-contacting bars, means to rotate said web member during rotation of said reel shaft, means eccentrically mounting the web members to normally position the yarn-contacting members carried thereby in a zone constituting onehalf of the periphery of the reel in radially expanded position and the yarn-contacting bars carried thereby in.a zone .constituting approxi nately the other half Micro of the periphery of the reel in radially receded position whereby during rotation of the web members about said reel shaft the respective yarn-contacting bars will successively move in a fixed path relative to the adjacent iixed yarn-contacting bars from radially expanded position, where the yarn-contacting bars carried by said web members are in yarncontacting position, to radially `receded position where said yarn-contacting bars are out of yarncontacting position, and means to move the web members supporting the yarn-contacting bars in radi-ally expanded position axially in the direction of the yarn travel over the reel andin the opposite direction while in the radially receded position, but impart no axial movement to the web members when the bars carried thereby are the same radial distance from the reel axis as the xed bars.

9. A yarn-advancing mechanism comprising a reel having a central shaft, means for rotating said reel shaft, a pair of spaced end plates; one of said end plates being secured to said reel shaft, means to separately rotate the other of said end plates during rotation of said reel shaft, a set of spaced circumferentially arranged yarncontacting bars secured to said end plates, a second set of yarn-contacting bars disposed alternately between the yarn-contacting bars of the t reelshaft, means eccentrically mounting the web f -members to normally position the yarn-contacting members carried thereby in a zone constituting one-half of the periphery of the reel in radially expanded position and the yarn-contacting bars carried thereby in a Zone constituting approximately the other half of the periphery of the reel in radially receded position whereby during rotation of the web members about said reel shaft the respective yarn-contacting bars will successively move in a xed path relative to the adjacent fixed yarn-contacting bars from radially expanded position, where the yarn-contacting bars carried by said web members are in yarncontacting position, to radially receded position where said yarn-contactingbars are out of yarncontacting position, and cam means to move the web members supporting the yarn-contacting bars in radially expanded position axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position, but impart no axial movement to the web members when the bars carried thereby are the same radial distance from the reel axis as the fixed bars.

10. A yarn-advancing mechanism comprising a reel having a central shaft, means for rotating said reel shaft, a pair of spaced end plates, one of said end plates being secured to said reel shaft, means to separately rotate the other of said end plates during rotation of said reel shaft, a set of spaced circumferentially arranged yarn-contacting bars secured to said end plates, a second set of yarn-contacting bars disposed alternately between the yarn-contacting bars of the first set, each yarn-contacting bar of the second set being secured to a respective web member adapted to move in a fixed path relative to the adjacent fixed yarn-contacting bars, means to rotate said web member during rotation of said reel shaft, means eccentrically mounting the web .members ,Y 10 Y Ito normally position the yarn-contactingl mnibers carried thereby in a zone constituting one- 'half of the periphery of the reel in radially expanded position and the yarn-contacting bars carried thereby in a zone constituting approximately the other half of the periphery of the reel in radially receded position whereby during rotation of the web members about said reel shaft therespective yarn-contacting bars will successively move in a xed path relative to the adjacent fixed yarn-contacting bars from radially expanded position, where the yarn-contacting bars carried by said web members are in yarn- .contacting position, to. radially receded position where said yarn-contacting bars are out of yarncontacting position, c m means to move the web members supporting t` e yarn-contacting bars in `radially expanded position axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position, but impart no axial movement to the web members when the bars carried thereby are the same radial distance from the reel axis as the fixed bars,` and'means to rotate said cam means in the direction opposite to that of said reel shaft.

11. A yarn-advancing mechanism comprising a reel having a central reel shaft, means for rotating said reel shaft, two sets of yarn-contacting bars mounted to rotate about the center axis of said shaft, one of said sets of yarn-contacting bars Vbeing disposed alternately between the yarncontacting bars of the other set, means xedly mounting one of said sets of yarn-contacting bars against radial and axial movement, means mounting the yarn-contacting bars of the other of said sets for axial' reciprocation and radial in-and-out movement in a fixed path relative to the adjacent fixed yarn-contacting bars, means operative during rotation of the reel to move successively the movable yarn-contacting bars in said fixed path from vradially expanded position, where they contact the yarn, to radially receded position where they are out of Contact with the yarn, means to move the movable yarncontacting bars, while in radially expanded position, axially in the direction of the yarn travel over the reel and in the opposite direction while in the radially receded position, but impart no axial movement to said movable bars when the latter and the fixed bars are the same radial distance from the reel axis, and means to prevent deflection of the movble bars due to the tension set up by the yarn wraps around the reel.

12. A yarn-advancing mechanism comprising a reel having a central shaft, means for rotating said reel shaft, a pair of spaced end plates, one of said end plates being secured to said reel shaft, means to separately rotate the other of said end plates during rotation of said reel shaft, a set of spaced circumferentially arranged yarn-contacting bars secured to said end plates, a second set of yarn-contacting bars disposed alternately between the yarn-contacting bars of the first set, each yarn-contacting bar of the second set being secured to a respective web member adapted to move in a fixed path relative to the adjacent fixed yarn-contacting bars, means to rotate said web member during rotation of said reel shaft, means .eccentrically mounting the web members to normally position the yarn-contacting members carried thereby in a zone constituting onehalf of the periphery of the reel in radially expanded position and the yarn-contacting bars carried thereby in a zone constituting approxianw@ mately the other half of. the periphery of the ee1 in radially reced'ed, positronr whereby during rotation of the web members about said reel shaft the respectiver yarn-contacting bars will successively move in a fixed path relative to the adjalcent xed 'yarn-contacting bars from radially expanded position, where, the yarn-contacting bars carried by said web members are in lyarncontaclting position, to radially receded position where said yarn-contacting bars are out of yarncontac'ting position, cam means to move the web members supporting the,'yarn-contacting bars in radially expanded position axially in the direction of the yarn travel over the reel and in the .Opposite direction while in the radially receded position, but impartv` no axial movement to the web members when the brs. carried thereby are the same radial distance from the, reel axis as the fixed bars, vmeans to rotate said cam means in the direction opposite to that of said reel shaft, and means to prevent deflection of said movable bars due to the tension set up by the l yarn wraps around the reel.

13. A yarn-advancing mechanism comprising a reel having a central shaft, meansl for rotating said reel shaft, a pair of spaced end plates, one of said end plates being secured to said reel shaft, means to separately rotate the other of said end plates during rotation of said reel shaft, a set of spaced circumferentially arranged yarn-contacting bars secured to said end plates, asecondvset of yarn-contacting bars disposed alternately between the yarn-contacting, bars of the rst set, each yarn-contacting bar of the second set being secured to a respective web member adapted to move in a xed path relative to the adjacent xed yarn-contacting bars, means to rotate said web member during rotation of said reel shaft, means eccentrically mounting the web members to normally position the yarn-contacting members carried thereby in a zone constituting onehalf of the periphery of the reel in radiallyex,- panded position and the yarn-contacting bars carried thereby in a zone constituting. approxi- 12 mately the other half of the peripheryof the Vreel in radially receded position whereby during rotation of` the web members about said reel shaft the respectivel yarn-contactingl bars, will successively move in a fixed path relative to the adjacent fixed yarn-contacting bars from radially Vexpanded position, where the yarn-contasting bars carried by said web members are in yarn-contacting position, to radially receded position Where said yarn-contacting bars are out of yarn-contacting position, cam means to move the web members supporting the yarn-contacting bars in radially expanded position axially in the direction of the yarn travel, over the reel and in the opposite direction while in the radially re.- ceded position, but impart no axial movement to the web members when the bars carried thereby are the same radial distance from the reel axis as the fixed bars, means to rotate said cam means in the direction opposite to that of said reel shaft, and means to prevent deflection of said movable bars due to the tension set up by the yarn wraps around the reelA comprising a cam follower carried on, the lower end of each of said Web members cooperating with a cam mounted to rotate about the 'center axis o'f said central shaft.

ALVIN L. EWING.

REFERENCES CITED The` followingl references are ofV record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,052,125 Boos Feb. 4, 1913 1,052,212 Boos Feb. 4, 19.13 2,115,025 Kline et al.. Apr. v26, 1938 2,175,218 Samerdyke Oct. l0, 1939 2,387,252 Furness Oct. 231, 1945 2,403,031 Stanley July 2, 1946 2,414,644. Gram Jan. 211947 2,444,071 Stanley June 29, 1948

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