US2677507A - Tail cutter for winding machines - Google Patents

Description

y 4, 1954 J. w. MAY 2,677,507

TAIL CUTTER FOR WINDING MACHINES Filed Aug. 16, 1950 2 Sheets-Sheet 1 INVENTOR:

ATTORNEYS M y 4, 1954 J. w. MAY

TAIL CUTTER FOR WINDING MACHINES 2 Sheets-Sheet 2 Filed Aug. 16, 1950 Llo/vw 14 MZIY EJWM ATTORNEYS Patented May 4, 1954 UNITED STATES PATENT OFFICE V TAIL'CUTTER FOR WINDING MACHINES John W.:May,#:Penilleton, S. 0.,assign'or to Deering Milliken Research Trust, Pendleton, SLO.

a nonprofit-trustof. Maine Appiic'a'tionAug'ust"16, 1950, Serial No. 179,672

"8 Claims. 1 This invention relates to an improved tail cutter for winding machines and it is especially adapted for use with a winding inachine o'f a type known as the Whitin-Schweiterautomatic filling bobbin winder, manufactured by Whiti-n Machine Works of Whitinsville, Mass.

Heretofore machines of the type described have been equipped with a tail cuttercomprising a substantially pointed member having a knife edge which automatically passed adj acent br between the rings on the base of a bobbin for severing the tail of yarn upon a bobbin being filled and prior to'its being ejected and an empty bob bin replacing the same. However, it has been found that sometimes the point of the cutting blade will engage the base or wooden part of the bobbin adjacent or betweenthe rings'and-would thus damage the periphery "of the bobbin.

Moreoventhe-ringsof the bobbin are not coniplete ring-s but are split and thus there is a gap at each ring through which the yarn tail "may pass. When the tail passed through the g'apbi the ring adjacent the blade of the prior art cutter, it would not be raised sufiiciently from thesuriace of the bobbin "to be engaged and out o by theblade.

It is an object of this invention to overcome suchdefects by providing an improved tailcutte'r including a blade member which is normally spaced substantially radially of the ringson the l;

into operating position, in which position "the projections will be disposed within the spaces between the'rings on'the base of the bobbin and will engage the yarn at one or more points-where it crosses the ringswith rotation of the bobbin, so as to sever or break the tail of the yarn. Since the projections which penetrate between the ringscn the bobbin have a total length which is less than the depth of the spacesdefined by the rings, it is impossiblefor the projections enter-= ing between the rings on the bobbin base, to engage the wooden base of the bobbin "and to damage the same.

More specifically, it'i's an object of this invention to provide, "in a winding machine 'of the type described a tail cutter blade adapted to be moved into operative position in a radialplane relative to the axisof abobbin in'which'filling is being Wound, the blade being provided with a plurality of notches inone edge which coincide withthe rings on the'b'ase of the bobbin and which define a plurality of projections preferably of less length than the depth of the spaces-fie fined by the rings and means fer supporting the blade including a tail-cutter bled-tie supphrt'i nember pivotally supported on the machine on an parallel to the axis-0 f the bobbin 'onwhieh the filling isbeing wound and including ine'ah's automatically operable upona' 'bobbin being-filled for swinging the support member and 'its'elittr blade into operative position, "there being suitable stop nieans foraccurately determining the osition at which the blade will stop adjacent the base of the b'obbinso the projections-on theb lade will extend 'past the peripheries-of the'ri'ng s'on the base of the bobbin and will terminate in closely spaced relation to the periphery of the base of the bobbin without engaging the same, but close enough to the bbbbin that thesp'aee between the projections and the base will'b'eless than the diameter of the yarn.

It is another" object 'of'the invention 'tojprovid'e a tail cutter of the "type described with'spr'ihg means interposed between the tail cutter *blai ie support member and the means for actuating movement of said member so as to permit the said actuating ineanstocontinue its movement after the blade on the blade support member has 'rnoved to the desired position in closely spaced relation to the base of the bobbin-anti whereby the actuating means for the tail-butter blade support member need not 'be precise as to its'length of stroke.

Some of the'objects 'of the invention having been. stated, other objects will appear as the description proceeds when taken in connection with the accompanying "drawings, in which Figure "1 is a fragmentary side elevation of a winding machine .Of the type described "with many of the parts'broken away and those parts which are not pertinent to the presentihv'entioh being omitted for purposes .of clarity;

Figure 2is an enlarged iraginentaryelevation with parts in section looking substantiallyalong the line 22 in Figure l with manyrof the parts broken away .for purposes of clarity and showing the improved'tailzcutter in operating position;

Figure 3 is a fragmentary ltopzplan View 106%:- ing substantially atnthe 'top-of Figure 2;

Figure 4 is a sehematic fragmentary isometric view-looking substantially ill the directioh b'flili arrow 4 in-Figure 3 but'showing the tail cuttei' in an inoperative position; c

Figure '5 is a schematie fragmentary elevatibfh looking substantially along the line 5-5 in Figure 2;

Figure 6 is a schematic fragmentary elevation similar to Figure 5 but showing a modified form of blade for engaging and severing the tail of yarn.

Referring more specifically to the drawings, the numeral l6 broadly designates the framework of an automatic filling winding machine of a type such as is manufactured by Whitin Machine Works, Whitinsville, Mass, and which is generally known as a Whitin-Schweiter automatic filling bobbin winder. This framework [6 includes a casing H in which conventional gearing and cams, not shown, are disposed for effecting operation of the various conventional parts of the machine. The framework it! also includes a horizontally disposed fixed rod 12 which extends outwardly from the front of the casing ii and which has a conventional front stud plate l3 suitably secured thereto in which a conventional manually operable cam lever rod trigger it has pivotal movement.

. This rod l2 usually supports a stationary bobbin holder, not shown in the present drawings,

but which is clearly shown in a patent to W. Schweiter, No. 2,268,310 of December 30, 1941. The front stud plate (3 also has a shaft i5 extending rearwardly therefrom in parallel relation to the rod [2 which also assists in supporting the said stationary bobbin holder, not shown; A conventional rock shaft 16 is also supported at opposed ends thereof in the casing II and the front stud plate l3 and is instrumental in supporting and effecting operation of a conventional yarn feed carriage 20, portions of which are broken away and only those parts which are pertinent to the present invention being shown in Figure 1.

The conventional gearing, not shown, disposed within the casing l l is instrumental in effecting intermittent rotation of a shaft 2| having a sprocket wheel 22 fixed thereon on which a conventional carriage operating chain 23 is mounted. Opposed ends of this chain 23 are connected to the front and rear ends of the carriage 26, as at 24 and 25 respectively. This chain also passes over a conventional roller 21 rotatably mounted, as at 36, on the stud plate l3. The automatic winding machine also includes a conventional r spring loaded chuck member or bobbin head holder 32 which is moved into and out of operating position by conventional automatic means, not shown, disposed within the casing H and to which bobbins are directed, during a transfer operation, from a chute 33 suitably supported on the framework 16. There is only one bobbin shown in Figures 1, 2 and 3, this bobbin being designated at 34. The particular type of bobbin on which yarn is usually wound on machines of this type has an enlarged base 35 provided with a plurality of spaced peripherally disposed rings 36, these rings usually being made of metal and the bobbin base 35 usually being made of wood.

The conventional carriage 20 has a knock-off projection integral therewith which, upon a desired amount of yarn being Wound onto the bobbin 34, will engage a mating knock-off block 4| secured, as by a screw 42, on a conventional cam lever rod 43. This cam lever rod 43 is connected at its front end, in a conventional manner, intermediate the ends of the pivoted cam lever rod trigger [4. The rear end of the cam lever rod 43 is connected, as by a stud 44, to the screws 6|.

lower end of an arm 45 which extends upwardly, in Figures 1 and 2, and is fixedly mounted on the outer end of a conventional cam shaft 46 extending from the casing II at one side of the framework l0.

It is thus seen that, upon the knock-off projection 40 of the carriage 20 engaging the mating knock-off block 4|, the block 4|, along with the cam lever rod 43, will move from left to right in Figure 1 thus causing the arm 45 and the shaft 46 to move in a counter-clockwise direction. This will condition the conventional parts, not shown, of the machine within the casing ll so as to cause the transfer of a bobbin from the bobbin holder 32 to be replaced by an empty bobbin in a conventional manner. This particular type of winding machine also includes a conventional shaft 41 having an arm 50 fixed thereon which is provided with a cam follower 5! in one end thereof for engaging a conventional back wind cam 52. There is also shown, in Figure 1, a conventional control knob 53 which is adapted to be manually positioned relative to a pin 54, and spaced below the control knob 53 is a picking finger unit 55. The parts 41 to 55 are shown merely to illustrate that these parts will not interfere with operation of the invention. The parts 41 to 55 are, otherwise, not pertinent to the present invention and a detailed description thereof is deemed unnecessary.

The parts heretofore described are conventional parts of an automatic filling bobbin winding machine and it is with these parts that the present invention is particularly adapted to be associated.

A tail cutter unit support is suitably secured to the exterior surface of the front wall of the casing H by any suitable means such as It might be stated that winding machines of this type are usually provided with suitable threaded bores for reception of the screws 61 so the improved tail cutter may be readily applied to the machine without altering the machine. This support 66 is provided with spaced bearing portions 62 and 63 in which a horizontally disposed, forwardly and rearwardly extending, shaft 64 is oscillatably mounted.

The medial portion of the shaft 64, between the bearing portions 62 and 63 of the support 60, has a tubular spacing member 65 adjustably secured thereon, as by a set screw 66. The front end of the shaft 64 extends forwardly of the bearing portion 63 and is fixedly mounted intermediate the ends of a first pivoted member or blade supporting member 6'! which, as will be observed in Figures 2 and 4, extends inwardly and upwardly above the bobbin 34 positioned in the bobbin holder 32 and which has a forwardly bent substantially L-shaped portion 1%} integral therewith which extends in substantially parallel relation to the axis of the bobbin holder 32. This forwardly bent portion of the blade supporting member 61 extends downwardly and has a substantially rectangular blade 1! suitably secured thereto, as by screws 12.

This blade H is provided with a plurality of substantially semi-circular cavities or notches 13 in the lower or free edge thereof which, as may be observed in Figures 3 and 5, coincide with the rings 36 on the base 35 of the bobbin 34. These notches 13 define a plurality of spaced substantially fiat-ended projections I4 which are adapted to enter the spaces between the rings 36 when the blade H is moved into campus operative position, in ."aimanner to be later rlescribed, the outermost oi the projections 5' movingadjacent the outer or remote edges of the rings 36 in sodoing.

The end or the blade supporting :member vBl, remote from the end .to which thesblade H is secured, has a horizontally bent tail portion -..or tab is integral. therewith whichis adapted to engage the lower end of an adjustment screw 16 when the blade i i is-move'dinto operative position as is clearly shown in Figure :2. This adjustment screw it threadably penetrates an outwardly projecting portion or car I! integral with the tail cutter unit support '60 and islocked in adjusted posit on by a lock nut =80 threadabl mounted thereon. The support 60 has aborizontally disposed stub shaft 81 projecting outwardly therefrom on which a bell crank or second pivoted member, broadly designated "at 82 :is oscillatably mounted, this bell crank :82 being confined onthe stub shaft'8l by asuitable washer 83 and a cotter pin 84.

The bell crank 82 has axially spaced outwardly extending first and second arms 85 and 86, respectively, which are spaced apart from each other by a suitable sleeve 81 to which they are suitably secured, the sleeve 81 being oscillatably mounted on the stub shaft 8|. These arms 85 and 85 extend at substantially right angles with respect to each other.

The free end of the first arm 85 is resiliently connected to the portion of the blade supporting member iii, remote from the end to which the blade ii is secured, by means of -'a coiled tension spring '99.

The tension spring '90 is connected to the free end of the first arm 85 by means of a suitable spring anchor 3i projecting inwardly from the free end of the arm 85 and the lower end of the tension spring '90 is connected to the tall -or outer portion of the blade supporting member -6l' by a'suitable spring anchor 92 (Figures 2, 3 and i). In order to insure that the blade H will be moved to substantially the inoperative position shownin Figures 1 and l when the arm 44 is disposed in substantially the position shown in Figure 1, a pin 93 is loosely confined within the coils of the tension spring 90 and, upon the free end of the first arm 85 being moved-downwardly in Figure 2, the anchor 9| thereon will move the pin 93 against the anchor 92 on the bladesupporting member 6? to cause the same to move in a counter-clockwise direction in Figure 2. The function of the tension spring 90 will be presently described.

Pivotally connected to the free or lower end of the second arm 3% of the bell crank 82, as at 95, is an irregularly bent link or connecting rod 96, this connecting rod 96 being connected to the rower or free end of the second arm 86 of the bell crank t? by means of a cuff member H10 in which one end of the connecting rod or link 96 is threadably embedded and which is held in adjusted position therein by a lock nut ifll threadably mounted on the link 96 and bearing against the free end of the cuff member Hill. This connecting rod or link 96 extends rearwardly and downwardly in a stepped manner so as to'clear the parts ii to 55 heretofore described and is pivotally mounted at its rear end on the stud M heretofore described (Figures 1 and 2).

The tubular spacing member 65 (Figure 3) is of less length than the distance between the bearing portions 62 and 63 so as to assist in obtaining 6. blade ii relativeto the ringstt on the base 0f the bobbin. frhis-spacingmembertt will also permit a relatively slight endwise movement of the shaft LSO the projections 14 on the blade H may center themselves with respect to the spaces between the rings 36.

Referringto Figured there will beobserved a modified form of blade mi which may be employed in lieu of the blade 'i-i heretofore described. Thisiblade 10'! is also adapted to be secured to the forwardly bent portion :10 of the blade support member 51 by any suitable means such as screws 102. It win he noted that this blade 4 0! differs materiarlly from the blade ll in that it is provided with a plurality of spaced 'fiat bottom cavities 163, which are defined by a plurality of substantially V-shaped projections or prongs FM. Tneseprojectionsmfl function in the identical manner-or" the projections '74 on the blade 1 I.

Method of operation It is well-known, to those familiar with the art, themanner in which bobbins suchas the bobbin 34, are fed to the chuck or bobbin holder-32 as preceding bobbins are transferred automatically through conventional means associated with-this machine and as a new bobbin is positioned in engagement with the bobbin holder 32 as shown in Figures l, 2, 3 and 4, the bobbin holderor chuck 30 32 partially recedes into the casing II and asthe new bobbin is positioned in alinement with the same, the tail portion of the yarn, which is indicated at T in Figures 3 and 4, is clampingly held between the bobbin holder 32 and the base 35 of the bobbin. The carriage '20 then directs the yarn to the bobbin in a conventional manner and, in so doing, the tail portion T of the yarn-is pulled tightly'across the outer edges of the peripherally disposed rings 36 on the base of the bobbin 34 as is clearly shown in Figures 3 and 4.

The chain 23 then functions in a well known manner to gradually move the carriage 26 from left to right in Figure 1 until the bobbinis filled with yarn and, at which time, the projection) on the carriage will engage the mating knockofi' block ll on'the cam lever rod 43 and will cause the cam lever rod 43 to move from left to right in Figure 1. This will, in turn, cause the arm #5 to rotate a partial revelution in a counter-clockwise direction to impart movement to the link 96 from left to right in Figure 1.

This willcause the bell crank 82 to move in-a counter-clockwise direction in Figure l, with the result that the first arm will move upwardly in Figures 1 and 2. This will cause the blade supporting member 6'! to move in a clockwise direction'fr'om the position shown in Figure 4 tothe position'shown in Figure 3, that is, until the tab portion 15 of the blade supporting member 67 engages the lower end of the adjustment screw 76. This adjustment screw 76 will have been adjustedin such a manner that, upon the tab it of the blade supporting. arm 61 engaging the adjustrnentscrew T6, the walls of the notches 13, in Figure 5, will assume a position in precise closely spaced relation to the outer peripheral edges or the rings 36. The space between the outer edges of the rings 36 and the walls or" the notches 13 may thus be determined within a few thousandths o'f-an inch as desired.

The notches 13 are of such depth that the lower edges of the projections 14 on the blade H in Figure 5 will assume a position in precise closely spaced relation to the periphery of the an optimum adjustment of the "position of the '75 base 350i the bobbin 34. Thus, 'the'clearan'ce between the edges of the projections 14 and the base 35 of the bobbin 34 and the clearance between the rings 38 and the walls of the notches 13 is less than the diameter of the yarn and the tail of the yarn T, which extends across the outer edges of the rings 36, will, due to rotation of the bobbin 34, engage the projections 14 on the blade H to be severed thereby, in which instance, the projections will either cut or break the tail of yarn immediately adjacent the point at which the yarn is initially wound onto the bobbin 34.

It might be stated that, if so desired, an operator may cause the bobbin 34 to transfer before it is filled by grasping the manually operable cam rod trigger lever M and moving the same from left to right in Figure 1, which will, in turn, move the cam lever rod 43 from left to right to also impart movement of the tail cutter blade H into operative position.

Whether the device is operated manually or automatically, as heretofore described, the arm 45 may continue its movement in a counterclockwise direction in Figure 1 after the portion 15 of the blade supporting member 6'! has engaged the lower end of the adjustment screw 16 and, therefore, the tension spring 90 is provided to permit the bell crank 82 to continue its movement in a counter-clockwise direction in Figure 1 after the blade H has assumed the desired operative position. The blade H is moved into operative position only momentarily and conventional means disposed within the casing H of the framework l will cause the shaft 4'6, along with its arm 45, to move a partial revolution in a clockwise direction in Figure l to thus return the associated parts to inoperative position.

In this instance, the bell crank 82 is moved in a clockwise direction, in Figure 1, causing its first arm 85 to move downwardly in Figure 4 until its spring anchor 91 engages the upper end of the pin 93, the lower end of the pin 93 normally resting upon the spring anchor 92 of the blade supporting arm 61. Upon the spring anchor 9| being moved into engagement with the pin 93, it is evident that continued downward movement of the arm 86 will cause the blade supporting member 6'! to move in a counter-clockwise direction, in Figure 3 until it assumes substantially the position shown in Figures 1 and l. A transfer operation then takes place, that is, the bobbin on which the yarn has been wound is discharged from the bobbin holder 32 and an empty bobbin replaces the same, and the cycle in the operation of the device is repeated as heretofore described. 1

The modified form of blade |0I functions in the identical manner in which the blade H functions upon being moved into and out of operating positio and a further description thereof is unnecessary.

In the drawings and specification, there has been set forth a preferred embodiment of the invention and although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. An improvement in a winding machine for winding yarn onto a bobbin provided with a base having a plurality of spaced peripherally disposed rings thereon, said winding machine having means for receiving the bobbin and for imparting rotation thereto and also having means for 8 directing the yarn to the bobbin and also having means for clampingly holding the tail of the yarn during a winding operation and whereby the yarn will extend across the outer periphery of said rings as it is being wound on said bobbin, said machine also having a pivoted arm extending from one side thereof and also having means automatically operable upon a predetermined amount of yarn being deposited on a bobbin for moving the pivoted arm in one direction and then returning the arm to its original position, said improvement comprising a blade supporting member pivoted intermediate its ends to the framework of the winder, a blade secured to one end of said pivoted member and normally disposed in an inoperative position relative to the base of the bobbin during a winding operation, means automatically operable upon a desired amount of yarn being wound onto said bobbin for moving the pivoted member to cause the blade to move into operative position, said blade being provided with a plurality of closely spaced substantially semi-circular cavities in its end adjacent the bobbin, said cavities defining a plurality of spaced projections, means limiting movement of the pivoted member upon the blade moving into operative position so the projections will enter the spaces between the rings and said cavities being of such depth that the walls of the cavities will be disposed in precise closely spaced relation to the outer periphery of said rings and the outer edges of the projections will be disposed in closely spaced relation to the periphery of the base of the bobbin for entering the path of the tail of yarn extending across the rings so as to cause a severance of said tail of yarn, a mechanical connection between the blade supporting member and the pivoted arm extending from the side of the machine and a resilient means interposed in the mechanical connection to permit movement of the pivoted arm on the side of the machine and its corresponding mechanical connection beyond the limited move- .-ment of the pivoted member.

2. An improvement in a winding machine provided with means for successively receiving and transferring the bases of bobbins, each having a plurality of spaced peripherally disposed rings on its base, said winding machine having a framework and also having means for imparting rotation to the bobbin, and also having means for directing yarn to the bobbin and also having means for clamping the yarn at the base of the bobbin as the yarn is initially fed to the bobbin so the tail of the yarn extends across said rings and said framework also having a shaft extending from one side thereof and also having an arm extending radially from said shaft and also having means automatically operable upon a transfer operation taking place for moving said arm about the axis of said shaft, said improvement comprising a blade supporting member pivoted intermediate its ends on the framework, a blade secured to one end of said blade supporting member and having a plurality of closely spaced projections on its free end, said projections being spaced substantially parallel to the axis of a bobbin on which yarn is being wound, a bell crank pivoted on said framework and having a pair of radially extending arms thereon, a resilient connection between one of the arms of said bell crank and the end of the blade supporting member remote from the blade, a link pivotally connected at one end thereof to the other arm of the bell crank and 9 i pivotally connected at the other end thereof to said arm extending from the shaft at the side of the framework and means limiting movement of said blade supporting member whereby, upon a predetermined amount of yarn being deposited on the bobbin, the arm extending from the shaft will impart movement in one direction to the bell crank to, in turn, impart movement to the blade supporting member to cause the projections on said blade to move into the spaces between the rings on the bobbin and whereby the projections will come to rest in closely spaced relation to the periphery of the base of the bobbin between said rings and in the path of the tail of yarn extending thereacross so as to cause a severance of the tail and the resilient connection serving to permit movement of the bell crank in a given direction after the blade supporting member has ceased its movement.

3. An improvement in winding machine provided with means for successively receiving and transferring the bases of bobbins, each having a plurality of spaced peripherally disposed rings on. its base, said winding machine also having a framework and also having means for imparting rotation to. the bobbin, and also having means for'directing yarn to the bobbin and also having means for clamping the yarn at the base of the bobbin as the yarn is initially fed to the bobbin so the tail of the yarn extends across said rings and said framework also having a shaft extending from one side thereof and also having an armextending radially from said shaft and also having means automatically operable upon a transfer operation taking place for oscillating said arm about the axis of said shaft, said. improvement comprising a blade supporting member pivoted intermediate its ends on the framework, a blade secured to one end of said blade supporting member and having a plurality of closely spaced projections on its free end, said projections being spaced substantially parallel to the axis of a bobbin on which yarn is being wound, a bell crank pivoted on said framework and having first and second radially extending arms thereon, a resilient connection between the first of the arms of said bell crank and the end of the blade supporting member remote from the blade, a link pivotally connected at one end thereof to the second arm of the bell crank and pivotally connected at the other end thereof to said arm extending from the shaft at the side of the framework and means limiting movement of said blade supporting member whereby, upon a predetermined amount of yarn being deposited on the bobbin, the arm extending from the shaft will impart movement in one direction to the bell crank to, in turn, impart movement to the blade supporting member to cause the projections on said blade to move into the spaces between the rings on the bobbin and whereby the projections will come to rest in closely spaced relation to the periphery of the base of the bobbin between said rings and in the path of the tail of yarn extending thereacross so as to cause a severance of the tail and the resilient connection serving to permit movement of the bell crank in a same direction after the blade supporting member has ceased its movement, the resilient connection including a coiled tension spring connected at one end thereof to the first arm of the bell crank and connected at its other end to the end of the blade supporting member remote from the end to which the blade is secured, a pin disposed within the confines of the tension spring and opposed ends thereof nor-' mally engaging the bell crank and the blade supporting member so as to permit the bell crank tocontinue its movement in said same direction after the blade supporting member has ceased its movement and to permit the bell crank to move the blade supporting member to inoperative position upon movement of the arm extending from its said shaft at the side of the framework in the opposite direction.

4. In a winding machine for winding yarn on bobbins having a base provided with a plurality of spaced rings encircling the base of the bobbins and across the tail of the yarn is passed at the beginning of the winding operation whereby the tail of the yarn rotates with the bobbin, said machine also having a pivoted arm extending from one side thereof and means automatically operable upon a predetermined amount of yarn being deposited on a bobbin for moving the pivoted arm in one direction and then returning thearm to its original position; the combination of movable means mounted adjacent the base of the bobbin and having a plurality of projections thereon adapted to pass between said rings simultaneously, said movable means normally occupying an inoperative position relative to the base of the bobbin during a winding operation, mechanical connections between said movable means and said pivoted arm whereby said pivoted arm will.

move the projections on said movable means be tween the rings simultaneously and into the path of the tail of yarn to break the same upon the completion ofwinding of yarn on a bobbin and then return said movable means to its normal position, and a resilient means interposed in said mechanical connections to permit movement of the pivoted arm; and its corresponding connections after the projections on the movable means have passed between said rings.

5. In a winding machine for winding yarn onto a bobbin having a plurality of spaced peripherally disposed rings thereon said machine having means for receiving the bobbins, one at a time,

' and for imparting rotation thereto, means for directing the yarn to the bobbin, means for clampingly holding the tail of yarn during the winding operation whereby the yarn will extend across the outer periphery of said rings as it is being wound on said bobbin, said machine also having a first pivoted arm extending from one side thereof and means automatically operable upon a predetermined amount of yarn being deposited on a bobbin for moving the pivoted arm in one direction and then returning the arm to its original position; the combination of a blade supporting member pivoted intermediate its ends to the framework of the winder, a blade fixed to one end of said blade supporting member and normally disposed in an inoperative position relative to the base of the bobbin during a winding operation, a second pivoted arm spaced from the blade supporting member, a, mechanical connection between the second pivoted arm and the first pivoted arm extending from one side of the machine, a resilient means connecting the second pivoted arm to the blade supporting member and being relaxed while the blade is in said normally inoperative position whereby said blade will be resiliently moved into operative position relative to the rings on the bobbin for ensnaring and causing a severance of said tail of yarn upon movement of said first pivoted arm in said one direction.

6. In a structure according to claim 5, said blade having a plurality of closely spaced projections on its end adjacent the bobbin and being so arranged as to enter the spaces between the rings when moved to operative position, and means limiting movement of said blade toward operative position whereby said resilient means permits movement of the first pivoted arm on the side of the machine and its corresponding mechanical connections beyond the limited movement of the blade supporting member.

7. In a winding machine provided with means for successively receiving and transferring the bases of bobbins, each having a plurality of spaced peripherally disposed rings on its base, said winding machine having a framework, means for imparting rotation to the bobbin, means for directing yarn to the bobbin, means for clamping the yarn at the base of the bobbin as the yarn is initially fed thereto so the tail of yarn extends across said rings, a shaft extending from one side of said framework, an arm extending radially from said shaft and means operable automatically upon the occurrence of a transfer operation for oscillatably moving said arm about the axis of said shaft; the combination of a, blade supporting member pivoted intermediate its ends on said framework, a blade fixed to one end of said blade supporting member and having a plurality of closely spaced projections on its free end, said projections being spaced substantially parallel to the axis of a bobbin on which yarn is being wound, alever pivoted on said framework, a resilient connection between the lever and the end of the blade supporting member remote from the blade, a link connection between said lever and said arm extending from the shaft at the side of the framework, adjustable limiting means limiting movement of said blade supporting member whereby,

during a transfer operation the arm at the side of the framework will impart movement in one direction to said lever and the blade supporting member to cause the projections on said blade to move into predetermined closely spaced relation to the base of the bobbin and between said rings so as to cause a severance of the tail of the yarn extending across the rings, and the resilient connection serving to permit movement of the lever in a given direction after the blade supporting member has ceased its movement as limited by said limiting means.

8. In a structure according to claim '7, said resilient connection including a coiled tension spring connected at one end thereof to said lever and connected at its other end to the end of the blade supporting member remote from the end to which the blade is fixed, a pin disposed within the confines of the tension spring and opposed ends thereof normally engaging the lever and the blade supporting member so as to permit the lever to continue its movement in said given direction after the blade supporting member has ceased its movement and whereby said lever will move the blade supporting member to inoperative position upon movement of the arm at the side of the framework in the opposite direction.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 332,512 Hoggas M Dec. 15, 1885 539,869 Holland et al May 28, 1895 2,343,935 Senfleben Mar. 14, 1944 2,361,813 Beckman Oct. 13, 1944 2,449,328 Schweiter Sept. 14, 1948

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