US3295788A - Tensioning apparatus - Google Patents

Description

Jan. 3, 1967 H, RlCHTER 3,295,788

TENS IONING APPARATUS Filed Dec. 22, 1964 2 Sheets-Sheet 1 INVENTOR.

HANS H. R/fw TER 4/3 23M ATTORNE V5 Jan. 3, 1967 H. H. RICHTER TENSIONING APPARATUS w wcm w 2 W m M Filed Dec. 22, 1964 United States Patent 3,295,783 TENSIONING APPARATUS Hans H. Richter, Cranston, KL, assignor to Leesona Corporation, Warwick, R.I., a corporation of Massachusetts Filed Dec. 22, 1964-, Ser. No. 426,281 5 Claims. (Cl. 242154) The present invention relates to tensioning apparatus and relates, more particularly, to a novel tensioning apparatus for use with a textile machine.

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

In the prior art there are a wide variety of tension devices which operate by presenting a tortured path to yarn passing therethrough. These tension devices, which may be appropriately referred to as wrap-type tensions, commonly have interdigitating fingers or other elements about which the yarn is wrapped or at least partially wrapped to form the tortured path. The amount of tension imparted to the yarn by the tension device is a function of the degree of wrap made by the yarn about the fingers or other elements. It is known to provide means for varying the degree of wrap the yarn makes with the tensioning elements so as to adjust periodically the tension imparted in the yarn by the tension device. customarily, this adjustment is effected by'the yarn strand itself acting to shift the mass of elements comprising the tension so that these elements assume some new position. The present invention represents improvements over such wrap type tension devices. Thus, the instant tensioning apparatus has particular application where yarns down to -40 denier are to be twisted. Prior art tensions have been found unsatisfactory with such yarns due to their mass and undesirably high inertial characteristics as they are operated. A further feature of the tension apparatus is its ability to hold its tension value over long periods of time without attention. This is in clear contrast to prior art compensating tension devices which are deleteriously affected by the deposition of lint and other foreign matter on the operating parts therof. With the foregoing in mind, the tension apparatus of the present invention acts to impart a predetermined amount of tension to a strand of yarn and the tension so imparted is automatically adjusted to compensate for variations in the strand tension arising from external sources so that the output tension on the yarn emerging from the tensioning device is maintained at a constant value.

Thus, it is one object of the present invention to provide improved tensioning apparatus capable of imparting tension to an advancing strand of yarn, wherein said tension so imparted is automatically varied to compensate for externally induced tension variations in the yarn so that the tension in the yarn at the output side of said tension apparatus is substantially constant.

Still a further object of the present invention is to provide tensioning apparatus capable of being easily and rapidly adjusted to yield a predetermined value of tension in yarn.

Yet, another object of the invention is to provide tensioning apparatus capable of compensating for tension variations in yarn as the yarn is delivered from one point to another, which said tensioning apparatus is capable of use with a wide variety of textile machines.

Another object of the present invention is to provide a yarn tensioning apparatus which permits easy and rapid threading of the yarn therethrough.

Other objects of the invention will in. part be obvious and will in part appear hereinafter.

The invention accordingly comprises the apparatus possessing the construction, combintion of elements, and arrangement of parts which are exemplified in the following detailed disclosure and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the present invention, reference should be had to the following detailed description taken in connection with the accompanying drawing wherein:

FIG. 1 is an elevational view of a textile machine embodying improved tensioning apparatus made in accord ance with the present invention;

FIG. 2 is an enlarged elevational view of the improved tensioning apparatus of FIG. 1;

FIG. 3 is an exploded view of the tensioning apparatus of FIG. 2;

FIG. 4 is a sectional view taken along the lines IV-IV of FIG. 2 and illustrating the path of the yarn threaded through the apparatus with the rotary tensioning member situated in an inactivated position; and

FIG. 5 is a view similar to FIG. 4 but illustrating the rotary tensioning member in an active position to form a tortured path for the yarn passing therethrough so as to impart tension to the yarn.

From a broad or general point of view the present invention may be characterized as follows. A principal frame member is provided with a pair of oppositely disposed yarn guides which serve normally to direct a strand of yarn in a straight-line path. A tensioning member is supported for rotary movement on an axis between the two spaced yarn guides. Said rotary tensioning member is provided with a pair of eyelets and, also, has attached thereto a pair of tensioning pins, both the eyelets and the pins being engageable with the yarn as the tensioning member is rotated to thereby deflect the yarn from its straight-line path and present a tortured path for the yarn. As the yarn is engaged by the eyelets and pins it is deflected from its straight-line path. In consequence thereof, it is moved into engagement with a pair of fixed snubbing posts and is caused to wrap about these posts and about the eyelets and pins. As a result, the yarn assumes an increasingly accentuated zig-zag path as the yarn engages the eyelets, pins, and post to an increasing egree, the friction produced thereby being operable to provide tension in the advancing strand of yarn. A rather long, torsional, low rate spring is provided to rotate the tensioning member, this spring being so dimensioned as to produce a substantially constant force on the tensioning member throughout its full arc of rotation. Damping means in the form of a spring member acts to control undesirable fluctuations in the rotational movement of the tensioning member, thereby preventing said tensioning member from hunting. A pretension is disposed upstream of the rotary tensioning member in order to moderate and control externally induced tension fluctuations in the yarn and to maintain the yarn in contact with the tensioning components of the tensioning apparatus.

Referring now to FIG. 1, the-re is shown a preferred embodiment of the improved tensioning apparatus of the instant invention incorporated in a winding machine of the type disclosed in US. Patent 2,769,299 to John V. Keith for Twisting and Winding Machine and issued November 6, 1956. Only so much of the structure of that machine has been set forth in the drawing as is necessary to a full and complete understanding of the relationship between that machine and the present invention. Further, while the detailed description of the present invention is directed to its association in connection with the machine of the cited patent, it will be readily apparent that the invention is capable of adaptation to a variety of other types of textile machines.

In the machine of the cited patent, as illustrated in FIG. 1, a winding unit is provided comprising a housing secured to a channel member 12 which forms a bed supported by legs 14. A traverse mechanism, not shown, together with a spindle 16 are journalled in housing 10 and are driven by a source of power located adjacent one end of the machine, all in the manner explained in the prior cited US. Patent 2,769,299. A shaft 18 is journalled in housing 10 with one of its ends projecting from the front end thereof and is manually rockable by means of a handle 20. The inner end of shaft 18 is connected to a clutch, not shown, for coupling and uncoupling the yarn traverse mechanism and spindle 16 to operate the winding mechanism.

A multiple twist spindle unit of a type well known in the art is located below housing 10 and generally comprises a spindle 32 secured to a spindle bolster 34 which is connected by any convenient means to one arm end of an arm 36. Arm 36 is attached to a shaft 38, which, in turn, in secured to member 12. A whorl 42 and a disc like flyer 44 are secured to spindle 32. The weight of the multiple twist spindle unit 30, augmented by a spring 46, tends to urge arm 36 rearwardly to bring whorl 42 into contact with a spindle driving belt 48 which extends in a generally horizontal plane along the front of the machine unit. Belt 48 is driven by any convenient source of power,

such as an electric motor located at one end of the machine. Contact of the whorl 42 with belt 48 rotates fiyer 44 in a manner well known in the art to impart twist to yarn strand Y. A plurality of spaced idler pulleys 50 are carried on a horizontal rail 52 supported on legs 14 by bracket 54. Said pulleys 50 serve to track belt 48 on the opposite side of the belt from whorl 42. The idler pulleys 50 thereby apply a force opposing the thrust of whorl 42 against the belt.

The upper portion of spindle 32 has an axial bore which connects with a radial bore formed in fiyer 44, but not illustrated herein, to provide a pass-age for yarn Y in a manner common in multiple twist spindles. A holder 58 for carrying a package of untwisted yarn P is journalled on spindle 32. A tension unit 60, to be more fully described hereinafter, is seated in the axial bore in spindle 32 and a cap or bonnet 62 is fitted over the tension device to provide a suitable lint protecting means for the tension device and to alford a guard to prevent entanglement of the yarn or wrapping of the yarn about the body of the tension device as the yarn strand is advanced off package P. Bonnet 62 has a central aperture through the top thereof at 64 which is in alignment with the yarn receiving portion of tension device for accommodating strand of yarn Y.

The winding unit illustrated herein is threaded for operation by having a strand of yarn Y withdrawn from package P and passed downward through tension device 60 and continuing in a downward direction through the axial bore of spindle 32. Upon emergence therefrom the yarn is directed through the radial bore in flyer 44. Thereafter being drawn upwardly through a suitable guide 64, supported from member 12, and onto winding spindle 16. In operation, the winding mechanism is started by rocking handle 20. Flyer 44 is thereupon rotated to swing a loop of yarn around package P in a manner well known in the art to impart a plurality of turns of twist into the yarn for each turn of the spindle. Win-ding spindle 16 is rotated to draw the yarn Y upward to wind it into a package.

The several components just described and their mode of operation are old and well known and are presented to illustrate but one apparatus for utilizing the present invention, being understood that the present invention is readily adaptable to many other apparatuses of the type 4 wherein controlled tension in an advancing strand of yarn is required.

As stated above, the tension device 60 is advantageously disposed to act on the yarn being withdrawn from package P and advanced to winding spindle 16. In accordance with the usual practice the yarn is directed downward through the tension device where a controlled resistance or tension is imparted thereto. To this end, the tension device 60 of the present invention includes a C-shaped metal frame 70 which serves as the principal support for the tension elements. Frame 70 is arranged with an elongated depending post 72 extending from its lower wall or leg, said post being received snugly with the top of the axial bore of spindle 32. As seen in FIGS. 3-5 post 72 has an axial aperture 74 extending therethrough. Further, shank 72, preferably, is provided with a locating keyway adapted to engage a radially projecting mating key in spindle 32, neither the key nor keyway being illustrated herein, but both of which cooperate to prevent rotation of the tension unit relative to spindle 32.

A further post 76 is positioned at the distal end of frame 70 from that supporting post 72. Also, post 76 has a central bore or aperture 78 longitudinally therethrough to provide for the passage of yarn. The apertures 74 and 78 of posts 72 and 76 respectively are aligned and, thus, guide a strand of yarn extending therebetween, normally, in a straight-line path therebetween.

The open side of C-shaped member 70 is bridged by an elongated flat plate 80 which is fastened to frame 70 by a pair of screws 82, 83. The central region of plate 80 has a flange or boss 84 faced with a washer 85 of a material having a low coeflicient of friction such as Teflon manufactured by E. I. duPont de Nemours and Co., Inc., Wilmington, Delaware. A central bore 86 is provided through boss 84 and washer 85, and an arbor 88 is journalled for rotation in said bore. The inner end of arbor 88 projects inwardly from plate 80 within the confines of frame 70 and affords support for a rotary tensioning member 90. A set screw 92 threadedly engages through the hub 94 of the rotary tensioning member to secure this member onto arbor 88 in order that these two components may rotate together. The side of rotary tensioning member 90 remote from hub 94 is provided with a spacer 96 serving to position said member 90 apart from plate 80. It will be observed in FIGS. 2 and 3 that rotary tensioning member 90 has its opposite extremities folded at right angles to its main body and each extremity has a wear-resistant grommet seated therein so as to provide a pair of oppositely disposed, aligned yarn receiving eyelets 97, 98. Spacer 96 is of suflicient thickness so as to situate eyelets 97, 98 in alignment with the axial apertures 74, 78 of posts 72, 76, respectively, as best shown in FIG. 4.

Arbor 88, already described as rotatable in bore 86, extends outwardly from plate 80 and receives one end of a spiral spring 100 fixedl in a hub 102 formed thereon. An enlarged flange 103 is formed integrally with hub 102 and arbor 88. The opposite end of spring 100 is fastened to the side of a circular guard or cap 104. In turn, cap 104 is secured against the outer side of plate 80 by a pair of screws 106, 107 and mating clamp rings 108, 109 respectively, engaging on flange portion 110 of cap 104, the screws being threaded into a suitable hole in plate 80. Clamp rings 108, 109 are of sufliciently large diameter to overlay a portion of flange 108 when screws 106, 107 are seated. By thi advantageous arrangement cap 104 maybe rotated to any desired position thereby, in effect, winding spring 100 up to any desired extent within the limits of the spring and, thus, set a predetermined load on the spring. This, in turn, establishes a predetermined torsional force tending to rotate rotary tensioning member 90 and arbor 88 clockwise as shown in FIGS. 4 and 5. With cap 104 thus positioned screws 106, 107 may be tightened to set the cap in position and hold spring 100 at its pre-set position. It will be observed that spring 100 is, desirably, formed of a relatively large number of convolutions so that the torsional force imparted thereby to arbor 88 is smooth acting and essentially uniform throughout the complete movement of tensioning member 90.

Damping means in the form of a damping spring 114 is positioned adjacent the outer wall of plate 80. A spacer 116 is provided between the inner wall of the damping spring and the outer wall of plate 80 in order that the damping spring can align with the outer pointed end 116 of arbor 88. Screw 83 serves to hold the damping spring 114 and pacer 116 in position as well as to secure plate 80 to frame 70. The upper portion of damping spring 114 bears against the pointed end 118 of a arbor 88 to provide an anti-friction thrust of flange 103 against washer 85. Intermediate the position at which arbor 88 communicates with damping spring 114 and the lower end of said damping spring 114, the damping spring is bored through to receive a screw 120 which extends therethrough and threadedly engages in a tapped hole in plate 80. Set screw 120 is thus operative to exert an inwardly directed force on damping spring 114 which is transmitted as axial thrust to arbor 88. In turn, this axial thrust is effective to urge flange 103 against low friction washer 85 to thereby provide a moderating or damping action on rotary tensioning member 90, thereby overcoming possible hunting, or overly sensitive compensating tendency, which may otherwise be introduced into said member 90 in response to the rotary movement imparted by spring 100.

As best shown in FIG. 3 the mid-portion of the main shank of a frame 70 has a plate-like section 122 cast therewith. A pair of spaced-apart tension posts 124, 126 are embedded in section 122 and project therefrom in the direction of rotary tensioning member 90. The outer ends of tensioning posts 124, 126 terminate free of contact or interference with the rotational movement of said tensioning member 90. However, each of the tension posts 124, 126 extends beyond the vertical plane of yarn Y as the yarn stretches in a straight line between posts 72 and 76. Viewing FIG. 4, it will be seen that tensioning posts 124, 126 are offset from vertical alignment with each other and, rather, are situated so that yarn strand Y extending between posts 72, 76 in a straightline path can extend between the tensioning posts 124, 126 without interference therefrom when tensioning member 90 is rotated to align eyelets 97, 98 with apertures 74, 78. Also, there is supported in hub 94 of rotary tensioning member 90 a pair of yarn tensioning pin 128, 130. Said pins 128, 130 are embedded securely in said hub and project toward section 122 of frame 70 but terminate somewhat short of contact therewith. Once again, viewing FIG. 4, it will be observed that while tensioning pins 128, 130 are situated at diametrically opposite positions they are offset from true vertical alignment with each other, when tensioning member 90 is positioned so that eyelets 97, 98 align with apertures 74, 78, whereby yarn Y extending between apertures 72 and 76 can pass between these two posts without interference. It will be further observed in FIG. 4 that tensoining pins 128, 130 lie on a theoretical circle somewhat smaller in diameter than a further theoretical circle on which tensioning posts 124, 126 may be considered to lie. As will be described in more detail hereinafter, tensioning posts 124, 126, and tensioning pins 128, 130 cooperate with eyelets 97, 98 to impart a predetermined tension in strand of yarn Y as it is advanced through the tension device. To the end that the rotary path of rotary tensioning member 90 may be limited, a pair of stop pins 132, 134 are embedded at diametrically opposite positions in section 122 of frame 70. Stop pins 132, 134 project forwardly into the plane of rotational movement of said tensioning member 90, as best shown in FIG. 2. Thus, tensioning member 90 is restricted to a zone of movement in the order of 160 although it will be apparent that this path of movement may be adjusted by repositioning stop pin 132, 134.

It is desirable, particularly during threading-up of the device, that the yarn in the zone between aperture 78 to aperture 74 be controlled against lateral shifting. Hence, a sleeve 136 is provided which is formed from a resilient material. Sleeve 136 has a pair of generally semi-circular ears 138, 139 formed along one margin which are of some what larger diameter than the principal body of the sleeve. Ears 138, 139 are adapted to be pressed or snapped over the outer margins of section 122 to secure the sleeve thereon. Sleeve 136 has two elongated slots 140, 142 therein, the slot 140 opening upwardly toward aperture 78 while slot 142 opens downwardly toward aperture 74. As the yarn Y is threaded through slots 140, 142 said yarn is thus permitted to be deflected off a straight-line path in the direction of and to the extent of movement of eyelets 97, 98. However, lateral movement of the yarn, i.e., in the direction of plate or section 122 of frame 70, is restricted to the rather narrow transverse dimension of slots 140, 142.

To insure constant contact between the advancing strand of yarn Y and the various tension elements of the instant invention during operation of the unit a pretension array is provided. This pro-tension array is constituted as a pair of juxtaposed disks 144, 146 supported loosely on a tension post 148 which is, in turn, secured to plate 80 by means of a nut 149. The opposite end of tension post 148 is provided with a collar 150 to hold the tension disks 144, 146 on said post. A light spring 152 surrounds tension post 1481 and extends between the inside wall of plate 80 and tension disk 146. Thus, spring 152 provides a light biasing force urging disk 146 against disk 144. It will be quite apparent from FIG. 2 that the interfaces of disks 144, 146 are aligned with apertures '74, 78 so that a strand of yarn advancing between the two apertures will run between and be engaged by the tension disks.

To prepare the tensioning apparatus for operation screws 106, 107 are firstly loosened to permit cap 184 to be rotated manually. By this rotation spring 180 is tensioned or loaded to deliver a predetermined torque to arbor 88. This setting is made in accordance with the tension to be imparted to the yarn to be wound and will, of course, be determined by the usual factors, or requirements of multiple twist spindles. Once spring 100' is set, screws 106, 107 are tightened to bind their respective clamp rings 108, 109 on flange 110, thereby fixing the cap 104, and thus spring 100, in position. At this time damping spring 114 is adjusted to thrust against the pointed end 118 of ar-bor 88. As already stated, this spring 114 has for its purpose the controlling of hunting effect by yarn tensioning member 90.

At this juncture the yarn Y is threaded through the tensioning apparatus by passing downward through aperture 78, between tension disks 144, 146, through eyelets 97, 98, between slots 140, 142, and outward through aperture 74. At this time the yarn may be considered to define a path as illustrated in FIG. 4 passing between posts 124, 126 and pins 128, 130. However, it will be appreciated that the position of the yarn as shown in FIG. 4 would be theoretical in the absence of some external means holding yarn tensioning member with its eyelets 97, 98 vertical. 'Operationally, the yarn Y will, of course, assume a path somewhat akin to that shown in FIG. 5 due to the biasing influence of spring on tensioning member 90.

With the tensioning apparatus threaded as just described yarn may be advanced from package 'P to spindle 16 of the associated winding machine, said flyer 44 rotating to impart twist to the yarn as it is advanced. As just indicated, as the yarn is advanced, yarn tensioning member 90 will have rotated to a predetermined extent by spring 100 whereby the yarn is caused to flow in a tortuous path through the tensioning apparatus, as illustrated in FIG. 5. Thus, the yarn is caused to turn at an acute angle around eyelet 97, to snub or wrap partially about tensioning posts 124 and 126, to ride in surface contact with tensioning pins 128, 130, and to turn at a further sharp angle around eyelet 98. The pretension array including tension disks 144, 146 function to maintain a certain constant minimum tension on the yarn as it passes around the eyelets 97, 98, the tensioning posts 124, 126 and pins 128, 1311, thereby serving to maintain the yarn constantly in contact with these elements as the yarn is advanced and tensioning member 90 is rotated as shown in FIG. 5. Tension disks 144, 146 are under a light load from spring 152. Thus, while these tension disks add a slight increment of tension to the yarn, the primary tension control to the yarn is obviously the prime function of eyelets 97, 98, posts 124, 126, pins 128, 130, plus any contact the yarn may make with the upper edge of post 72 as the yarn enters aperture 74, see FIG. 5.

During the Winding operation it may occur that external factors such as resistance in the package P to the unwinding of yarn will cause the tension in the yarn to vary. In response thereto tensioning member 90 will rotate to compensate for such variations so that the yarn leaving the tension device is at a substantially constant tension. Thus, if the tension value in the yarn should rise from an external cause, the yarn would tend to pull tensioning member 90 closer to the vertical plane, that is to say, closer to the position of FIG. 4. Obviously, as tensioning member 90 approaches this vertical alignment the degree of yarn wrap about eyelets 97, 98, posts 124, 126 and pins 128, 130, as well as the degree of contact of the yarn on the upper edge of post 72 Will be reduced. It is evident that such reduction in wrap will be proportional to the increase in tension so that the total tension in the strand at the discharge side of the tension is held essentially constant. By the same token, if the tension in the strand should fall because of external variations, tensioning member 90, responding to the force of spring 100 will rotate further so that its long axis will more nearly approach a horizontal plane, consequently, the yarn Y will be deflected from vertical flowing thereby wrapping to a further extent around eyelets 97, 98, posts 124, 126, and pins 128 and 130, and engaging the upper edge of post 72 to a greater extent. As a result, the tensioning apparatus increases the value of tension it imparts to the yarn in proportion to the loss of inherent tension in the yarn. Therefore, the output tension is, again, maintained at a substantially constant level. Since spring 100 provides a low rate of energy response of the tensioning member 90 is relatively uniform in both directions of rotation thereby rendering the compensating movement of the tensioning member very sensitive.

In the event of yarn breakage during operation of the winding machine, tensioning member 90 will rotate against stop pins 132, 134 causing the yarn to assume a rather extreme Zig-zag condition between eyelets 97, 98, posts 124, 126 and pins 128, 130 so that advancing of the yarn is, advantageously, promptly arrested.

From the foregoing it will be seen that the present invention provides a highly eflicient tensioning apparatus capable of introducing a predtermined tension value to an advancing strand of yarn and capable of compensating for minute variations in the tension imparted to the strand so as to provide substantially constant tension in said strand being discharged from said apparatus.

Since certain changes may be made in the above apparatus without departing from the scope of the invention herein involved, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative only and not in a limiting sense.

What is claimed is:

1. Apparatus for tensioning an advancing strand of yarn comprising, a frame, a pair of fixed yarn guides supported on said frame and adapted to direct said strand in a straight path, a rotatable member disposed intermediate said guides and adapted to engage said strand, an arbor rotatably journalled in said frame and arranged to support said member, said arbor having a flange portion thereon, resilient means connected with said arbor for rotating said arbor and member, a damping element for engaging an end of said arbor and exterting an axial force to thrust said flange portion against said frame to thereby control the rotational movement of said arbor and member, and fixed means mounted on said frame and spaced apart from said straight path, said strand being engageable with said fixed means in response to rotation of said member to impart tension to said strand.

2. Apparatus as set forth in claim 1 including means for adjusting the force exerted by said damping element on said member.

3. Apparatus for tensioning an advancing strand of yarn comprising, a frame, a pair of fixed yarn guides supported on said frame and adapted to direct said strand in a straight path, a rotatable member disposed intermediate said guides, said member having yarn receiving eyelets at opposite ends thereof for receiving said strand of yarn, an arbor journal-led in said frame and arranged to support said member for rotation about an axis intermediate the ends of the member, resilient means connected with said arbor for rotating said member, a pair of spaced pins supported on said member, each said pin being disposed intermediate said arbor and an associated eyelet, a pair of fixed posts mounted in said frame and spaced apart from said straight path, each of said posts being positioned between one of said eyelets and the pin associated therewith, said strand being engageable with said eyelets, said posts and said pins in response to rotation of said member to impart tension to said strand.

4. Apparatus as set :forth in claim 3 including a yarn guiding sleeve for restricting the lateral movement of said yarn on said posts and said pins.

5. Apparatus as set forth in claim 3 wherein said resilient means is a spring, and means for adjusting the load on said spring.

References Cited by the Examiner UNITED STATES PATENTS 1,459,332 6/ 1923 Hineline 242-154 2,326,714 8/1943 Whalton 242-154 2,618,445 11/1952 B nder 242-154 2,685,417 8/1954 B-artleson 242-154 X 2,771,635 11/1956 Munch. 2,833,491 5/1958 Carroll 242-154 3,080,132 3/1963 Fisher et al. 242-154 3,176,927 4/ 1965 Irazoqui 242-154 X FOREIGN PATENTS 1,027,039 2/ 1953 France. 627,044 10/ 1961 Italy.

22,908 11/ 1900 Switzerland.

STANLEY N. GILREATH, Primary Examiner.

Claims (1)

1. APPARATUS FOR TENSIONING AN ADVANCING STRAND OF YARN COMPRISING, A FRAME, A PAIR OF FIXED YARN GUIDES SUPPORTED ON SAID FRAME AND ADAPTED TO DIRECT SAID STRAND IN A STRAIGHT PATH, A ROTATABLE MEMBER DISPOSED INTERMEDIATE SAID GUIDES AND ADAPTED TO ENGAGE SAID STRAND, AN ARBOR ROTATABLY JOURNALLED IN SAID FRAME AND ARRANGED TO SUPPORT SAID MEMBER, SAID ARBOR HAVING A FLANGE PORTION THEREON, RESILIENT MEANS CONNECTED WITH SAID ARBOR FOR ROTATING SAID ARBOR AND MEMBER, A DAMPING ELEMENT FOR ENGAGING AN END OF SAID ARBOR AND EXTERTING AN AXIAL FORCE TO THRUST SAID FLANGE PORTION AGAINST SAID FRAME TO THEREBY CONTROL THE ROTATIONAL MOVEMENT OF SAID ARBOR AND MEMBER, AND FIXED MEANS MOUNTED ON SAID FRAME AND

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