US2124498A - Winding machine - Google Patents

Description

July 19, 1938. SWANSON 2,124,498

WINDING MACHINE Filed Aug. 22, 1934 s sheets-sheet 1 Jul '19, 1938.

E. R. SWANSON WINDING MACHINE Filed Aug. 22, 1934 5 Sheets-Sheet 2 jirzii az- /Zi'arm .5:

. E. R. SWANSON Jill 19,1938,

WINDING MACHINE 5 Sheets-Sheet 3' Filed Aug. 22,. 1954 July 19, 1938.- E. R. SWANSON WINDING MACHINE Filed Aug. 22, 1934 5 Sheets-Sheet 4 July-19, 1938. E. R. SWANSON WINDING MACHINE Filed Aug. 22, 1934 5 Sheets-Sheet 5 Patented July 19, 1938 PATENT OFFICE WINDING MACHINE Ernest R. Swanson, Cranston, R. I., assignor to Universal Winding Company, Boston, Mass, a- 'corporation of Massachusetts Application August 22,1934, Serial. No. 7.41.012

21 Claims. (.01. 74---217) which operates to control the disposition of the turns of winding on the surface of the package to prevent the formationof bands or ribbons in which the yarn coils are crowded together or piledf.

One objectof the invention is to provide a simplified mechanism incorporated in the driving 7 means of the winding machine and operating to disrupt the synchrony between the rotation of the package and the traverse of the yarn during the winding.

Another object of the invention is to provide a mechanism of the type indicated for periodically varying the speed ratio between the rotation of the package and the traverse of the yarn-guiding means at recurring cycles throughout the winding.

Another object of the invention is to provide a mechanism of thetype indicated adapted for use on machines embodying a single rotating element for driving the package and traversing the'yarn; for example, a drive-roll with a helical yarnguiding, groove or grooves on its periphery, the

ribbon-breaking means operating to effect rapid fluctuationsin the speed of the roll to cause slippage between the roll and the package.

Another object of the-invention is to provide a I mechanism of the type indicated which is com.-

pletely automatic in its operation and adjustable to meet all requirements.

Further objects of the invention are set forth in the following specification which describes a preferred form of construction of the device, by

way of example, as illustrated by the accompanying drawings.

In the drawings: I V

Fig. 1 is a front elevation of a portion of a wind; ingjrame or gang winder showing the essential elements of the winding mechanism of one unit thereof in connection with the driving means which embodies the present improved .ribbon breaker or speed-changing device;

Fig. 2 is an end view of the winding frame showing the driving mechanism thereof connected to be driven by an electric motor;

Fig. 3 is an enlarged end View of the present improved ribbon-breaking mechanism;

Fig.4 is a detailed sectional view of the same taken on line 44 of Fig. 3;

Fig. 5 is a transverse sectional view through the mechanism taken on line 55 of Fig. 4; and

Fig. 6 is a detailed end view of the mechanism 5 for oscillating the stop-motion rocker-shaft from the ribbon-breaker rocker-shaft.

The present invention relates particularly to means for imparting an alternately accelerated and retarded rate of speedto one of the winding 10 elements of the machine, for example, the driveroll for-rotating the package; or in other instances it may be'applied to the drive for the yarn-traversing means when the latter is operated independently of the drive-roll. More spe- 15 cifically, the invention contemplates-the employ-,-

ment of automatically-operated means for periodically tightening and loosening the belt which transmits motion to the driven elementwhereby an acceleration and deceleration in the speed of go said element is effected. Referring to the drawings, the winding machine herein illustrated by way of example is of the double gang type comprising a plurality of winding Iunits arranged in series along the oppo- 5 site sides of a horizontal frame or bed 2 which is supported at its ends by suitable legs 3. Spaced along the top of the bed 2 are a series of brackets l which support bearings for the driving-shafts and other parts of the several winding mecha- 30 nisms, two opposite units being located between each pair 'of brackets but only one unit being herein shown.

In the construction of the machine as shown in Fig. 1 the winding mechanism comprises only 3 two principal elements, namely, the windingmandrel or spindle I5 on which the yarn-receiver or cop-tube C is rotatably supported, and the drive-roll ill for rotating the yarn-receiver and a in which is embodied the'means for traversing 40 I the yarn back and forth'axially of the package being wound. In this form of construction the usual reciprocating. thread-guide is dispensed with, the drive-roll having its peripheral surface provided with a helical groove or grooves 8 and 9 4 extending in opposite directions and adapted to receive the strand of yarn to guide it back and forth between the ends of the package. This particular form of traversing-means is shown and described in United States Letters Patent No. 50 1,749,355 dated March 4, 1930; It is to be understood, however, that the present ribbon-breaker or speed-changing device is adapted for use on winding machines of other types, for example, those wherein the package is driven by contact 55 frames 20 and 2|.

with a drive-roll and the yarn traversed by means of a reciprocating guide, or with any other arrangement of drum-driven winders.

In the form of construction shown in Fig. 1 the drive-rolls l0 are carried on and rotated by a horizontal shaft journaled in ball-bearings.

the drive-rolls, not herein shown, for the other series of winding units arranged on the opposite side of the winding frame or at the right-hand side as viewed in Fig. 2.

The present machine is shown as adapted for winding packages of conical form with the yarn built up on a suitable axial core or receiver, a wooden or fiber conical cop-tube C being illustrated in Fig. 1 as mounted to rotate on the winding-spindle or mandrel IS. The winding-spindle I5 is swiveled to the forward end of a weighted arm l6 which is pivotally supported at its rearward end to adapt the surface of the yarn-receiver C, or of the package'P, to be held firmly in contact with the periphery of the drive-roll I3. As the yarn is built up on the cop-tube C it forces the latter upwardly with the arm I5 swinging on its pivot in the manner common to machines of the present type.

Each winding unit is equipped with a suitable stopping mechanism, indicated generally by the reference numeral H in Fig.1, which is auto matically actuated when the yarn breaks or its supply is exhausted to arrest the winding operation by raising the package away from the driveroll Ill. The operation of the stopping mechanism is initiated by a rocker-shaft I9 journaled in bearings in the frames 4 and extending throughout the entire length of the machine. The rocker-shaft I9 is constantly oscillated during the operation of the machine by means to be later described.

The combined driving and ribbon-breaking mechanism of the machine is constructed and arranged as next described. Bolted to the top of the bed 2 are a pair of spaced brackets or cross- The drive-roll shaft -pro jects beyond the bearing |2 in the end bracket'4 with its reduced extremity 22 journaled in a ball-bearing 25 on the frame 20, see Fig. 4. A belt-pulley is keyed to the reduced end 22 of the shaft H at 28 and secured in place by means of a nut 29. The periphery of the pulley 30 is provided with spaced V-shaped grooves 21 for a pair of belts 99 by which it is driven from means to be later described.

The opposite drive-roll shaft 19 is somewhat longer than the shaft above mentioned, with its reduced end projecting through a clearance opening in the frame-member 23 and journaled in a ball-bearing on the frame-member 2|.

Mounted fast on the reduced end of the shaft |3 ,is a pulley of the same form and size as the pulley 30 previously described. The pulley 35 is keyed to the shaft I3 at 2B and held axially in place by a nut 29, see Fig. 3.

Arranged for vertical adjustment on the facing sides of the frame-members 2,8 and 2| are two complementary brackets 31 and 38, see Fig. 4. The brackets 31 and 38 are received in vertical grooves or guideways 39 on the frames 29 and 2| and held in adjusted position by means of disks 40 eccentrically mounted on the reduced portions 4| of a shaft 42. The ends 4| of the shaft 52 en a es project through holes in the frames 20 and 2| with nuts 53 screwed onto their threaded extremities and set up against the side of the frames to hold the shaft from turning. The peripheries of the eccentric disks 40 engage the opposite sides of horizontal slots on the outer sides of. the brackets 31 and 38, see Fig. 5, with the main portion of the-shaft 42 passing through vertical openings 45 in the webs at the side of the slots.

The brackets 37 and 38 support a rockable housing enclosing mechanism to be later described and carrying pulleys, to be later described, belted to the pulleys 33 and 3|. The brackets 31 and-38 are vertically adjustable for regulating the tension of the belts connecting the pulleys 30 and 35 with the driving pulleys carried by the housing 55. To adjust the brackets 3! and 38 the nuts 43 are loosened, after which the shaft 42 may be manually turned in either direction by inserting a rod through a hole 49 in the shaft toserve as a lever. As the shaft 52 is turned the eccentric disks 43 act on the sides of the grooves 45 to raise or lower the brackets 31 and 38 in the guideways 33, depending upon the direction of rotation of the shaft. After the brackets 31 and 38 have been adjusted to the proper height'the nuts 43 are again tightened to lock them in fixed position.

The housing 53 suspended between the brackets 37 and 38is in the form of a box-like cradle'having an opening in its top with a removable cover 5| set thereover. The side walls of the housing 50 are provided with bores for receiving a pair of cylindrical hubs 55 and 56 held therein by bolts 51 passing through flanges 58 on the hubs. A horizontal shaft 60' passes through the bore of the right-hand hub 56, see Fig. 4, with its reduced end "6| journaled in a bearing 4'! at the lower end of the bracket 38. The opposite hub 55 has a larger bore to adapt it to receive the reduced end of a sleeve 62 integral with the hub of a pinion gear I39 rotatably mounted on a relatively short shaft 63. The shaft 63 is journaled in the bearing 41 on the left-hand bracket 31 and projects therefrom in axial alinement with the shaft 60. Through this arrangement the two shafts 60 and 53 provide a pivot mounting for the housing 50 to adapt it to be oscillated about a fixed axis for a purpose as later explained. The shaft 63 is connected to oscillate the rocker-shaft l9, previously mentioned as employed for actuating the stop-motion of the machine, being coupled thereto by a universal-joint '65. The lastdescribed arrangement permits vertical displace ment of the shaft 63 with the adjustment of the bracket 31 without breaking its connection with the rocker-shaft l9.

Fast on the shaft 5|! within the housing 50 is a crank-arm 56 keyed to the shaft at 61 and secured in place axially by a set-screw 68. The lower end of the crank-arm 66 carries a stud II,

on which is journaled a bowl or roller 70 engaging vented by the hub of a worm-wheel 80 keyed to' the shaft 11 at 8| and held against the end of the cam by a nut 82 screwed onto a threaded portion Of the shaft. The cam 15 is "extended in a hub spur-gear 83 which drives a train of gearing to be later described.

Extending at right-angles below the shaft 11 is a horizontal drive-shaft 85 formed with a worm 86 which meshes with the worm-wheel 88, see Fig. 4. The ends of the shaft 85 are journaled in ball-bearings 81 and 88 mounted in the end-walls of the'housing 58. As illustrated in Fig. 4, the ball-bearings 81 and 88 are pocketed in journal-boxes 89 secured to the side walls of the housing 58 by means of bolts 98. The inner race of the ball-bearings 81 abuts the side of a flange 9| on the shaft 85 and a double-grooved pulley 92 keyed to the shaft at 93 has its hubv reduced and extended into the housing 89 to abut the opposite side of the race. The pulley 92 is arranged in alinement with the pulley 38 "on the roll-shaft II, being held in the shaft 85'by a nut 94 set up against a washer 95. An annular cap 96 secured to the outer end of the journal-box 89 by the bolts 98 serves as a closure therefor. The pulley 92 is connected to drive the pulley 38 on the drive-roll shaft II by a pair of endless V- shaped belts 99.

The right-hand end of the drive-shaft 85, as

viewed inFig. 4, is provided with a flange IN.

and keyed to the shaft at I82 between the flange and the inner race of the ball-bearing 88 is a spur-gear I83. The 'inner ball-race is held against the side of the gear I83 by-means of a nut I84 screwed onto the threaded end of the shaft 85 and set up against a washer I85. The outer ball-race of the bearing 88 is held against the inner flanged end of the journal-box 89 by an annular cap- I86 fastened in place by the bolts '98. With this form of. construction the axial thrust of the shaft 85 is taken by the ball-bearing 88.

A second transverse shaft I88, see Figs. 4 and 5, extending parallel to the shaft 85 is journaled in ball-bearings at the sides of the housing 58 with a mounting substantially identical withthat above described and therefore not herein shown in detail. Keyed to the shaft. I88 at I89 is a spur-gear II8, shown in Fig. 5, which meshes with the spur-gear I83 on the shaft 85. The shaft I88 projects from the side of the housing 58 to carry a pair of double-grooved pulleys III and I I2 keyed thereto and held in place by a nut I I3. The outer pulley, H2 is connected to drive the pulley 35 on the drive-roll shaft I3 by a pair of V- shaped belts I88.

' Referring to Fig. 2 of the drawings, the pulley III is connected by a pair of belts II6 to a similar pulley II4 fast on the armature-shaft of an electric motor H5. The motor H5 is bolted to a bed-plate I I! which may be mounted for vertical adjustment upon a base-plate II8 by means of bolts I I9. A suitable manually-operable switch, not herein shown, is usually provided for switching the current to the motor to control the drive for the whole, machine.

It has been stated that the present ribbonbreakingdevice operates to periodically accelerate andretard the speed of rotation of the driverolls I8 of the several winding units. This is accomplished by rocking the housing 58 about the axis of the shafts 68-63 to alternately tighten and loosen the belts 99 and I88 whereby they are caused to alternately grip and release their hold upon the pulleys 38 and 35which rotate the driveroll shafts II and I3.

As the shaft I88 is driven from the motor II5 by the belts II6 the worm 88 rotates the wormwheel 88 to turn the cam I5 whereby to oscillate the crank-arm as and thereby the shaft to. Means are provided for limiting the swinging movement of the crank-arm 66 under the action of the cam 15 to regulate the extent of rocking f motion imparted to the cradle or housing 58. When the limit of movement of the arm 66 is reached the roller 18 remains stationary Whereof it will cause the cam I5 to be moved bodily in the direction of its axis during its further rotation. By this action the housing 58 1s swung ,on its pivot, first in one direction and then in the opposite direction, to tighten and loosen the belts 99 and I88. The means for controlling the range of action of the arm 66 is constructed and arranged as next described.

As shown in Fig. 4, the reduced end 6| of the rocker-shaft 68 projects beyond its right-hand bearing 41 to receive a rectangular block I2I, see also Fig. 3, which is secured fast thereto by a set-screw I22. Fitted to slide in a vertical slot I23 in the outer face of the block I2I is an adjusting member or arm I25. The arm I25 is provided with a .slotted opening I26, see Fig. 3, through which projects a bolt I21 with its end screwed into a threaded'hole in the block I2I. The upper end of the arm I25 is provided with a triangularly-shaped opening I28 having its apex at the bottom as shown in Figs. 2 and 3. Referring to Fig. 4, the end of the adjusting shaft 42, previously described, is reduced in diameter to provide a stop-pin or stud I38 which projects through the triangular opening I28 in the arm I25 to limit the swinging movement of the latter in the manner and for the purpose as later explained.

It has been stated that the rocker-shaft I9 for the stop-motion is oscillated'from the shaft 63 and the means for imparting motion to this 1 latter shaft comprises connections asnext briefly described. Referring to Fig. 5, the gear 83, previously mentioned, meshes with a similar spurgear I32 on a stub-shaft I33 journaled in a bearing I34 onthe side of the housing'58. The gear I32 carries a bevel-gear I35 meshing with a similar bevel I36 free to turn on the shaft 68 and having the end of its hub keyed to the sleeve 62.at I31, see Fig. 4. The sleeve 62 is formed with the gear I39, previously mentioned, which meshes with a spur-gear I48 fast on a stub-shaft I4I journaled in a bearing I42 on the bracket 31 and held in place by a collar I43 at its outer end. The gear I48 carries an eccentric disk I45 on its side, see Fig. 6, with an eccentricstrap encompassing its periphery and formed with a crank-arm I46. A second crank-arm I48 is secured fast to the shaft 63 by a set-screw I49 and carries a pin I58 at its end engaging a hole in the'end of the eccentric-arm I46. Through these connections the shaft 63 is rocked to oscillate the rocker-shaft I9 connected thereto by the universal joint or coupling 65; the arrangement being such-as to impart a slower rate of movement to theshaft I9.

The parts of the; various mechanisms having now 'been described in detail, the method of operation of the complete machine will next be explained. The belts 99, I88 and H6 are placed over their respective pulleys to connect the ribbon-breaking mechanism with the drive by rocking the cradle 58 first one way and then the other as required. The tension of the belts 99 and I88 is regulated'by adjusting the brackets .31 and" to raise or lower the cradle 58. This is at its ends have been loosened. By turning the shaft 42 in its bearings the eccentric disks 40 ceiver in helical coils which make several turns may be rotated to either raise or lower the brackets 31 and 38 in the manner as before indicated. The distance between the driving shafts 85 and I08 carried in the housing 50 and the drive-r011 shafts II and I3 may thus be shortened or lengthened so that the pairs of belts 98 and eifect the drive, after which the nuts 43 are tightened to maintain the parts in their adjusted position. The pair of belts I I5 are placed around the pulleys III and I I4 to effect the connection between the driving mechanism and the motor To complete the adjustment at the driving end of the machine the control-aim I25 'may be moved vertically in the slot I23 of the block I2I and secured fast thereto by the bolt I21, whereby to regulate the extent of rocking motion of the housing 50. The arm I25 is herein illustrated, by way of example, as adjusted to its lowermost position with the fixed stud I30 projecting through the widest part of its triangular opening I28. With this adjustment the arm I25 is permitted to swing back and forth with a maximum range of throw during the oscillation of the shaft 60, and consequently the cam I5 will be moved axially to rock the housing 50 to the minimum extent as will be later explained.

Referring to Fig. 1 of the drawings, the machine is prepared for winding bymounting a suitable wooden or fiber cone-tube or yarn-receiver C to rotate on the spindle I5. For this purpose the arm I6 is raised on its pivot and the spindle I5 swung outwardly on its swiveled joint at the outer end of the arm in accordance with the usual method. After the cop-tube C is in place the spindle I5 is swung back into position above the drive-roll I0 and the arm I6 lowered to bring the surface of the tube into driving contact with the periphery of the roll. The strand of yarn y or other material is led up from its source of supply through a tension-device, not herein illustrated, thence drawn across the periphery of the drive-roll I0and its end attached to thecop-tube C in any suitable manner.

The drive-roll I0 is rotated continuously during the operation of the machine and as the cop-tube C makes contact with its periphery it will be driven from the roll to wind on the yarn. .As the yarn is taken up by the rotation of the cop-tube C the strand 1! enters the helical groove.

or grooves 8 and 9 on the periphery of the roll to be traversed thereby to deposit it on the refirst in one direction and then in the opposite direction. In this way the yarn is given a continuous traverse from one end of the cop-tube to the other and back again to build up a succession of courses forming overlying. layers whichof coils equal to the number of turns in.the groove or grooves 8 and 8. As the yarn builds up on the cop-tube C the latter recedes, from the drive-roll I0 and with the increasein diameter of the yarn mass its angularvelocity or I 00 are placed under proper tension to- 4 bands or ribbons.

tative speed of the package and drive-roll and,

consequently, there will be a corresponding variation in the number of turns laid on the surface ofthe package, or in the wind as it is called.

At the start of the winding the yarn coils are laid in open or spaced relationship, but when turns is lessened and the coils gradually close up and eventually tend to crowd together in This crowding or piling of the yarn coils takes'place each time the wind changes from a greater to a lesser number of even turns and ordinarily causes a ribbon wind on the surface of the package. several coils are laid over each other in the ribbon they tend to slip and slide out of place and roll on the surface of the package. This disturbs the twist of the yarn and tends to weaken it so that its quality is impaired and, as another serious defect, the ribbon prevents the yarn from delivering freely when it is drawn oif over the end of the package. The present invention operates to overcome this defect of ribbon wind in drum-wound packages by periodically disrupting the synchrony between the rotation of the package and the traverses of the yarn thereon.

The machine is driven by the belts II6 connecting the pulley II4 of the motor II5 with the pulley III on the shaft I08. The shaft I08 is rotated in a contra-clockwise direction as viewed in Figs. 2 and 5 while the opposite shaft 85 is rotated in a clockwise direction from the shaft I08 by the gears H0 and I03.

Assuming for the'purpose .of the following ex- When g planation that the housing 50 is in the position shown in Figs. 2 and 5 with the control arm I25 swung toward the right and limited from further movement by the fixed stud I30 engaging the left-hand side of its slot I28, then the pulley 92 will have been drawn downwardly to tighten the belts 88 which connect it with the pulley 30 on the drive-roll shaft II. At this juncture the opposite shaft I08 will be raised toward the other drive-roll shaft I3 so that the-pulley II2 will have been lifted slightly to slacken the belt I00 which drives the pulley 35. At this point in the cycle of operations of the ribbon-breaking mechanism the shaft II will be driven at maximum speed while the shaft I3 will have had its speed retarded under the eifect of inertia and such friction as occurs in the bearings, due to the release of tension on the belt I00 which allows it to slip on the peripheries of the pulleys 35 and H2. It will be understood that as each of the shafts II and I3 carriesa plurality of drive rolls I0 the load is multiplied by the cumulative weight and inertia of the several rolls.

The shafts 85 and I08 are driven continuously at a constant rate of speed from the motor I5 and consequently the shaft 'l'l carrying the cam 15 will be driven continuously, but at' a relatively slow rate of speed by the worm-86 and gear 80 connecting the two shafts. A relatively slow rocking motion is therefore imparted to thecrank-arm 86 to oscillate the shaft I50 carrying the control arm I25. During the turning of the cam I5 the crank-arm 66 is rocked first to swing the control arm I25 from one extreme-of throw to the other extreme and with the parts in position as shown in Figs.,2-and 5, and last described, the arm I25 will be rocked to the left until the right-hand side of its slot I28 brings up against the fixed stud I30 as shown in Fig.3 of the drawings. At this juncture the arm I25 is held from further movement and since the cam I5 has a throw greater than thatrequired to rock the arm I25 to its extreme. of movement in either direction the cam itself will be moved bodily to the left as the roller I is held immovable at the end of its throw. The movement of the cam I in the direction above indicatedacts to swing the whole housing or cradle 50 to the left as viewed in Fig. 3, thereby raising the pulley 92 toward the pulley 30 to slacken the belt 99.. The slackening of the belt 99 causes it to slip on the pulleys 30' and 92 to lessen its driving effect so that the drive-roll shaft II has its speedreduced by the inertia of the parts and other causes. Meanwhile, as the belts 99 are slackened the pulley H2 is rccked downwardly to tighten the other pair of belts I00 to cause the full effect of the driving force to be transmitted to the pulley 35 to speed up the drive-rolls carried on the opposite shaft I3.

As the cam I5 continues its rotation the opposite return portion of its groove I4 will act on the roller to rock the crank-arm 56 back in the opposite direction to swing the control arm I25 toward the right as viewed in Fig. 3. The control arm I25 is moved in this direction until the left-hand side of its triangular slot I28 brings up against the fixed stud I30, whereafter as the roller I0 is held stationary it will force the cam I5 bodily toward the right to rock the casing 50 in the same direction. The belts 99 are thus again tightened on the pulleys 92.and 30 and the belts I00 between the pulleys H2 and 35 are concurrently slackened to effect the result first explained; that is, an acceleration in the speed of the shaft I I and a corresponding deceleration in the speed of the shaft I3.

The ribbon-breaking mechanism continues to surface contact with the rolls I0 the speed of.

rotation of the packages should remain the same as that of the rolls. This is not the case, however, since there is necessarily some slippage between the surface of the packages and the peripheries of the drive-rolls due to various conditions. The cop-tubes C and the yarn wound thereon are of considerable-mass and the weight thereof increases with the growth in the winding. Moreover, as the packages are driven at a high rate of speed the force of momentumis very considerable. Hence when the speed of the driverolls I0 is retarded the velocity of the packages is not materially affected so that they continue their rotation at substantially the maximum rate.

It has been determined in practice that due to slippage between the surface of the package and the drive-roll the retardation in the speed of the roll does not appreciably alter the speed of the package. It is therefore the fact that the intermittent change in the speed of the roll I0 as controlled by the operation of the ribbon-breaking mechanism has only one effect, that is to change the ratio between the traverse of the yarn and the angular velocity of the package being wound.

' That is to say, the action of the ribbon-breaking mains substantially constant. In this way, the synchronism of the traverse with the rotation of the package is disrupted with the result that the usual crowding or piling of the yarn-turns on the surface of the winding is prevented to eliminate ribbon wind as usually present in drumwound packages.

It has been noted that in the present invention means are provided for adjusting the control arm I25 to regulate the extent of its throw whereby to control the range of movement of the rockable housing or cradle 50 which carries the belt pulleys 92 and i I2. Through this means the duration of driving contact of the belts 99 and I00 on their respective pulleys may be regulated to control the variation in speed of the drive-roll shafts in accordance with different requirements. With the arm I25 adjusted to the position shown in Fig. 3 of the drawings a maximum throw of the control arm is obtained before the crank-arm 06 is arrested in its motion to effect the shifting of the cam I5 which rocks the housing 50. With this setting of the parts the pulleys 92 and 2 will be moved to only a minimum extent with a dwell between their motions so that the alternate periods of driving contact and release of the belts will be relatively extended.

On the other hand, with the control arm I25 adjusted toward its uppermost position it will have only a slight range of movement as governed by the apex portion of, its. slot G28 and further to rock the housing 50 with the maximum extent of motion. .11 required, the full throw of the cam 15 may be utilized to swing the housing- 50 to the maximum extent so that the belts 99 and I00 will have only a relatively short period of driving contact withthepulleys 30 and 3'5. It will be understood that the control arm I25 is adjustable to various positions between the two extremes to accurately regulate the change in Epeed of the shafts u and I3 and the drive-rolls I0 carried thereby. In this way a'greater or less variation in the rate of traverse of the yarn iseffected to regulate the disposition of the turns of winding on the package in a manner to prevent any semblance of ribbon winding.

It will be observed from the foregoing that the presentv invention provides a particularly' ing mechanism. whereby to eflfect disruption in the synchrony between the rotation'of the pack age and the traverse of the yarn thereon to prevent ribbon winding. The present, improved ribbon-breaker may be embodied in the drive of the machine without materially adding to the parts thereof while making for greater compactness to save space. The principal operating elements of the drive are enclosed in the housing 50 to provide for continuous lubrication and prevent injury to the operator from the gearing and other moving parts. v

It is to be understood that the present-ribbonbreaking mechanism or speed-changing device may be applied to machines of a type different from that herein illustrated, for example, ma-

7 chines wherein .thepackage is rotated from a drive-rolland the yarn traversed by a reciprocating thread-guide or other means. It is also to be understood that while the present device is shown and described as embodied in a preferred ,form of construction. various modifications may be made in the structure and arrangement of out limiting myself in this respect, I claim:

1. In a machine for winding yarn, a variable speed drive for preventing ribbon winding comprising a driven pulley, a driving pulley movable with respect to the driven pulley, means for continuously rotating the driving pulley, a belt connecting said pulleys, and means for periodically moving the driving pulley with respect to the driven pulley at such frequency as to cause the driven pulley to be continuously driven in the same direction at alternately accelerating and decelerating speeds due to alternate gripping and slipping of the belt.

2. In a machine for winding yarn, a variable speed drive for preventing ribbon winding comprising a driven pulley, a driving pulley mounted.

to oscillate about an axis eccentric to that of the driven pulley, means to continuously rotate the driving pulley, a belt connecting said pulleys,-

said belt gripping the pulleys-in one position of the driving pulley and slipping thereon in an opposite position of the driving pulley, and means for oscillating the driving pulley from one to the other of two positions at such frequency as to cause the driven pulley to be continuously driven in the same direction at alternately accelerating and decelerating speeds.

3. In a machine for winding yarn, a variable speed drive for preventing ribbon winding comprising a driven pulley, a driving pulley movable with respect to the driven pulley, power-operated means for continuously rotating the driving pulley, a belt connecting said pulleys, and means directly connected to the power-operated means for continuously moving the driving pulley toward and away from the driven pulley to alternately tighten and slacken the belt on the pulleys to periodically change the speed ratio of the pulleys as the belt alternately grips the pulleys and slips thereon, said speed changing being efiected without arresting the vrotation of the driven pulley.

4. In a machine for winding yarn, a variable speed drive for preventing ribbon winding comprising a'driven shaft, a non-expansible pulley on the driven shaft, a driving shaft, a non-expan'sible pulley on the driving shaft, means for continuously rotating said driving pulley, a belt connecting said pulleys, and means for periodically displacing one of said pulleys with respect to the other pulley at such frequency as to cause the driven pulley to be continuously driven in the same direction at alternately accelerating and,

ley, a belt connecting said pulleys, and continuously operated means connected to oscillate the cradle to alternately tighten and slacken the belt. to cause it to slip whereby to varythe speed of the driven pulley without arresting the rotation of said pulley.

6. In a machine for winding yarn, a variable a speed drive for preventing ribbon winding comprising a driven shaft, a pulley on said shaft, a driving shaft mounted for movement toward and away from the driven shaft, a pulley on said driving shaft, a belt connecting said pulleys, and

continuously. operated means directly connected area-nee to the driving shaft to alternately move said shaft toward and away from the driven shaft to periodically tighten and slacken the belt to cause it to slip whereby to vary the speed of the driven pulley during continuous rotation of said pulley.

7. In a winding machine, a driven shaft, a pulley on said driven shaft, a driving shaft mount- 8. In a winding machine, a frame, a driven shaft journaled in the frame, a cradle, means on 1 the frame for mounting the cradle for rocking movement toward and away from the driven shaft, '2, driving shaft mounted on the cradle, means for continuously rotating said driving shaft, aligned pulleys onthe driving shaft and driven shaft, a belt connecting the pulleys, and means acting between the driving shaft and frame'for periodically rocking the cradle to altershaft, a belt connecting said pulleys, and means on the cradle acting between the driving shaft and rocker-shaft for periodicallyv rocking the cradle to alternately tighten and slacken the belt to vary the speed of the driven shaft during its continuous rotation by the driving shaft.

10.-In a winding machine, a pair of driven shafts, pulleys on said driven shafts, a driving shaft, means to continuously rotate the driving shaft, pulleys on the driving shaft aligned respectively with the pulleys on the driven shafts, belts connecting the pulleys on the driving and driven shafts, and means for periodically displacing the driving shaft to tighten the belt leading to the pulley on one of the driven shaftswhile slackening the belt leading to the pulley on the other driven shaft to alternately cause each belt to slip whereby to alternately accelerate and decelerate the rate of speed of the driven shafts without arresting the rotation of said driven shafts.

11. In a winding machine, a pair of driven shafts, pulleys on said driven shafts, a cradle mounted for oscillatory movement between the driven-shafts, a driving shaft on the cradle, means for continuously rotating the driving shaft, pulleys on the driving shaft aligned respectively with the pulleys. on the driven shafts,

and means for oscillating the cradle to periodically move the driving shaft toward and away from the driven shafts to tighten one of the belts while slackening the other belt whereby to cause each belt to slip in alternate relation to alternately decelerate and accelerate the rate of speed of the driven shafts without arresting the rotation of said driven shafts.

12. In a winding machine, the combination of a nonexpansible driven pulley, a rockable cradle,

a nonexpansible driving pulley journaled on the cradle, a belt connecting the pulleys, and a cam driven by the driving pulley for rocking the cradle to cause periodic slipping of the belt.

13. In a winding machine, the combination of a driven pulley, a rockable cradle, a driving pulley journaled on said cradle, a belt connecting the pulleys, a cam journaled on the cradle, means for driving the cam from the driving pulley, and means engaged by the cam to oscillate the cradle.

14. In a winding machine, the combination of a driven pulley, a rockable cradle, a driving pulley journaled on the cradle, a belt connecting the pulleys, a cam carried on the cradle, means for driving the cam, a crank-arm for oscillating the cradle, and means on the crank-arm engaging the cam.

15. In combination, a driven pulley, a rockably-mounted cradle, a driving pulley journaled on the cradle, a belt connecting said pulleys, a crank-arm for rocking the cradle, a cam on the cradle for oscillating the crank-arm, and means for limiting the motion of the crank-arm to cause it to move the cam to rock the cradle with a predetermined range of movement.

16. In combination, a driven pulley, a rockershaft, a-cradle rockable about the axis of said shaft, a driving pulley carried on the cradle, a

belt connecting the pulleys, a crank-arm fast on the shaft, a cam on the cradle for oscillating the crank-arm, and adjustable means for defining the extent of oscillation of the crank-arm tocause the cam to rock the cradle within predetermined limits to alternately tighten and slacken the belt on the pulleys.

17. In combination, a driven pulley, a rockershaft, a cradle rockable about the axis of said shaft, a crank for rocking the shaft, a cam journaled on the cradle and connected to oscillate the crank-arm, a driving shaft journaled on the cradle, means connecting said driving shaft to drive the cam, a pulley on the driving shaft, and a belt connecting said pulley with the driven pulley..

18. In'combination, a. driven pulley, a rockable cradle, a driving pulley journaled on the cradle, means for continuously rotating the driving pulley, means for adjusting the cradle to vary the distance between the driving pulley and v driven pulley, a belt connectlngsaid pulleys, and

continuously operated means for rocking the cradle to alternately tighten and slacken the belt to cause it to slip whereby to vary the speed of the driven pulley during continuous rotation of said pulley by the driving pulley.

19. In combination, a driven pulley, a rocka'ble cradle, a driving pulley journaled on the cradle, means for continuously' rotating the driving pulley, a belt connecting the pulleys, a cranlrarm vrockable independently of the cradle, a cam journaled on the cradle and connected to oscillate the crank-arm, means for driving the cam, and

means for limiting the extent of throw ofthe the driven-shaft, a cradle supported from the rocker-shaft, a driving shaft journaled on the cradle, means for continuously rotating the driving shaft, a pulley on'the driving. shaft, a belt connecting the pulleys, a cam carried on the cradle, gearing connecting the driving shaft to drive the cam, a crank-arm fast on the rockershaft, means on the crank-arm engaging the cam, and means for controllii'ig the range of movement of the crank-arm to cause the cam to be moved bodily to rockthe cradle to alternately tighten and slacken the belt to vary the speed of the driven shaft during its continuous rotation from the driving shaft.

21. In combination, a driven shaft, a cradle pivoted on the rocker-shaft, a driving pulley journaled on the cradle, a belt connecting the pulleys, a crank-arm fast on the rocker-shaft, a cam on the cradle for rocking the crank-arm, a control-arm connected to oscillate with the crank, and means to limit the motion of the control-arm to regulate the range of motion of the crank-arm whereby to cause it to move the cam to oscillate the cradle.

muns'ra. swmsou.

pulley, a rocker-

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