US3009662A

US3009662A - Device for starting winding operations in yarn winding machines

Info

Publication number: US3009662A
Application number: US589454A
Authority: US
Inventors: Furst Stefan
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-06-10
Filing date: 1956-06-05
Publication date: 1961-11-21
Anticipated expiration: 1978-11-21

Description

s. FURST 3,009,662

DEVICE FOR STARTING WINDING OPERATIONS IN YARN WINDING MACHINES 4 Sheets-Sheet 1 Nov. 21, 1961 Filed June 5, 1956 Nov. 21, 1961 s. FURST 3,0 2

DEVICE FOR STARTING WINDING OPERATIONS v IN YARN WINDING MACHINES Filed June 5, 1956 4 Sheets-Sheet 2 Nov. 21, 1961 5 U s DEVICE FOR STARTING WINDING QPERATIQNS 4 IN YARN WINDING MACHINES 4 Sheets-Sheet 15 Filed June 5, 1956 Nov. 21, 1961 s. FURST 3,009,662

DEVICE FOR STARTING WINDING OPERATIONS IN YARN WINDING MACHINES Filed June 5, 1956 4 Sheets-Sheet 4 United States Patent I 3,009,662 DEVICE FOR STARTING WINDING OPERATIONS IN YARN WINDING MACHINES Stefan Fiirst, M. Gladbach, Germany, assignor to Walter Reiners, M. Gladbach, Germany Filed June 5, 1956, Ser. No. 589,454 Claims priority, application Germany June 10, 1955 Claims. (Cl. 24227) My invention relates to a method and means for starting, in coil winding machines, the winding of a new coil or bobbin after completion of a bobbin previously wound.

This application is an improvement in the methods and devices described in my copending application Serial N0. 538,234, filed October 3, 1955.

The conventional method of starting a bobbin in automatic coil-changing winding machines for textile manufacture is as follows. The yarn end of a just completed bobbin is held fixed to the spindle head until after the next bobbin-winding operation is started. During starting of the next bobbin, the yarn is either cut or torn from the previously wound bobbin. The severed end remains clamped beneath the core head of the bobbin being newly wound. Then the yarn end protrudes at the core head out of the bobbin. Reference may be had to my US. Patent 2,657,867 for a more detailed description of the operation of known automatic means for performing the working actions required for the exchange of coils at each particular winding station after the winding on the cop has reached its predetermined size.

It is an object of my invention to provide a method and means for use in automatic coil winding machines which causes this thread end to be stuck into and beneath the first windings of the bobbin so that, when the bobbin is completely wound, the end will no longer protrude and cannot become entangled or cause disorder of the bobbined yarn during the subsequent use of the bobbin.

To this end, and in accordance with my invention, the yarn end forming the start of a new bobbin is gripped during an interval of time within which the Winding spindle or spindle head is started and brought up to the rated speed, and the yarn end is thereafter released not later than when the rated operating speed of the spindle head is reached. According to another feature of my invention, the just mentioned temporary gripping and timed releasing of the yarn end is effected by automatic means mounted on the spindle head.

Since, particularly during the first turns of yarn being wound upon a bobbin core, some of these turns are wound in the vicinity of the bore head, the yarn end, upon its release, is caught into and beneath the first layers of yarn so that the continued winding operation results in a package of yarn from which only the end of the last-wound layer will protrude but not the starting end of the first layer.

It is essential that the yarn end severed from the previously wound bobbin be clamped before the rotating winding motion for the next bobbin is started, and that the same yarn end be released at a given limit value of speed which is reached during the accelerating period of the winding operation. Consequently, according to another feature of the invention, the release of the previously clamped thread end is made dependent upon the speed or preferably the acceleration of the winding operation during its starting interval.

The magnitude of the clamping force when starting the new winding operation may either be larger or smaller than corresponds to the tearing force of the yarn being Wound. If the clamping force is greater than the tear limit of the yarn, then the yarn end, during starting of the next bobbin, is severed from the preceding bobbin simply by tearing. On the other hand, if the clamping force is smaller, then a separate cutting operation is needed for severing the yarn from the preceding bobbin. T 0 this end, a cutter or similar severing device may be provided. In such cases, cutting may be effected immediately after starting the winding operation. If desired, however, the yarn may also be cut at an earlier moment prior to inserting the core of the next bobbin to be wound; hence, the severing operation may be terminated a relatively long time prior to the starting moment of the next winding operation. In the latter case, the yarn must be kept in a given position a period of time sutlicient for the gripping operation so that the yarn end is securely clamped to the spindle head before the yarn is released from the cutting device.

According to another feature of the invention, the

severing device is so designed that the yarn is held fast by the cutting member itself with a holding force smaller than the clamping force that holds the yarnv end to' the spindle head. As a result, the yarn end is simply torn out of the severing device by the pulling force of the following winding operation. The most favorable forces to be exerted by the clamping and severing devices may vary with different kinds of yarn. The clamping devices therefore are preferably designed to permit varying and adjusting the clamping force.

The foregoing and more specific objects and features of the invention will be apparent from the following description in conjunction with the embodiments of devices according to the invention illustrated by way of example on the accompanying drawings in which: 7

FIG. 1 shows an individual winding station of a coil winding machine by a lateral view.

FIG. 2 shows the spindle head and adjacent components of the same embodiment on a larger scale and partly in section.

FIGS. 3 and 4 are partial front views of the spindle head in respectively different operating conditions.

FIGS. 5 and 6 show schematically a front view of part of the same device in two different operating conditions, FIG. 6 being a fragmentary end view of the position of the spindle head according to FIG. 14. v

FIGS. 7, 8 and 9 illustrate front views of the spindle head and associated parts for a somewhat modified design. 1 7

FIGS. 10 and 11 are schematic force diagrams explanatory of the operation of the device in the condition shown in FIGS. 3 and 4 respectively, for which purpose the diagrams of FIGS. 10 and 11 appear immediatelyabove FiGS.3 and,4respectively.; r 1' '3. ,2 Ti

FIGS. 12 and 13 show, in cross section, two modifications of the spindle head applicable in a machine other wise similar to the one described with. reference to'the preceding illustrations. 7 3

FIG. 14 shows an individual winding station similar to FIG. 1 but provided with adevice for facilitating the; starting of a new winding.

FIG. 15 shows a further modification of the spindle head, and FIG. 16 a front view of a component of the same device.

FIG. 17 is a perspective view of a coil winding machine comprising a number of coil winding stations ac cording to the invention.

As a rule, a coil winding machine of the type here of interest comprises a large number of individual winding stations as exemplified by FIG. 17. Each station is supplied with yarn from a package A from which the thread passes through an eye B or other guide means to the thread guide of the winding unit proper. v

FIG. 1 shows the essential parts of one of the coil winding stations of the machine. It comprises a spindle Patented Nov. 21, 186i head I mounted on a winding spindle 1a which is journalled in, and protrudes from, a gear housing 1b and, when in operation, is driven in the direction of rotation denoted by an arrow 1c. Mounted between the spindle head 1 and a counter bearing 2 is the bobbin core or quill 3 to be covered with a package of yarn. A rotating thread guide 4 is mounted on a shaft 4a which is also journalled in the gear housing 1b and during operation of the winding station rotates simultaneously with spindle 1a. FIG. 1 shows the winding station shortly after a completely wound bobbin 5 has been discharged into a receiving tray 6 and has been pushed to the rear side of the station. The yarn F, coming from the supply package (A in FIG. 17) passes through a guiding groove 4b of the rotating thread guide 4 past the spindle head 1 to the full bobbin 5. Mounted between spindle head 1 and receiving tray 6 is a severing and clamping device 7 (FIGS. 1, 7, 8, 9) which is active after each coil change.

- When, after termination of a winding operation, the full coil drops out of the coiling position into the trough 6 and is pushed to the left of the trough (according to the view of FIGURE 1) by a suitable pusher arm (not shown), such as is described in my Patent No. 2,657,867, then the thread F from the completely wound coil 5 must pass from the right end of the coil, past the coil entrainer head 1, to the thread guide 4. Separate means are not necessary for correctly positioning the thread, and the thread automatically takes the position according to that illustrated in FIGURE 7 after the arm 7 has seized and clamped the thread. Consequently, the Winding spindle can then come to a standstill at any rotary position during the preceding winding operation. However, if it starts running at the beginning of the now succeeding coil winding operation, then the gripper hook 8, which has for its purpose to fasten and hold the thread, has now moved into the angular position shown in FIGURE 7. In this position, the gripper hook 8 seizes the thread lying across the head of the spindle, as shown in FIGURE 7. Gripper hook 8 is adapted to function moving from any rotary position of spindle head 1 to that of FIGURE 7, and it is immaterial in which position the spindle head has previously come to rest.

Once the thread is seized from the finished coil 5 and clamped by the gripper hook 8, it then travels during the winding operation, or else it is severed oft" at its most highly stressed position by means of shears 16 1718 (FIGURES 5, 6) located between the clamping position of the arm 7 and the gripper 8.

v A hook 8 is mounted on spindle head 1 and is displaceable and rotatable relative thereto (FIGS. 1 to 11). Hook 8 is rigidly connected with an unbalance weight 9 (FIG. 2) by means of a shaft 10. Weight 9 has a slanting cam portion 11 in sliding engagement with a corresponding slanted cam portion 12 of the spindle head 1. As a result, a rotating movement of weight 9 causes not only a corresponding rotation of hook 8 but also a shifting motion of hook 8 parallel to the axis of shaft 10, this shifting motion being caused by the interengagement of the cam faces 11 and 12. The weight 9 is biased by a spring 13 tending to retain the weight 9 within a recess 14 of the spindle head, this position being best apparent from FIGS. 2 and 3.

The hook or catch member 8 which clamps the yarn is rigidly connected with the weight or body 9. This body is under the action of a spring 13 of which one end is fixed in the spindle head 1, and the other end is fixed at the body 9. A fastening of spring 13 to body 9 can be effected in the same manner as at the spindle head 1 (see FIG. 2), namely by means of an angular portion of the spring wire which enters into a bore in body 9. The spring end may also be fastened to the body 9 by means of point welding. The body 9 is normally held by spring 13 in the position illustrated in FIG. 2. The body 9 then lies in a recess 14 of the spindle head and its cam portion 11 rests upon a cam recess 12 of the spindle head 1. The body 9 was urged into this position by the rotating returning action and axial shoving force of the spring 13 which causes the body 9 to perform a returning rotation as well as an axial displacement. The body 9 will remain in this position under the action of spring 13 also during the initially slow starting operation. Only when the speed of rotation has exceeded a given predetermined magnitude will the body 9 rotate outwardly under the effect of the now increased centrifugal force, and the turning motion of the shaft 10 of the catch member 8, due to the sliding of cam portion 11 upon cam portion 12, also causes the axial displacement which releases the yarn end. This motion of shaft 10, and hence also of catch member 8, however, takes place only after the spindle head 1 has reached a relatively high speed of rotation, i.e. shortly before the normal operating speed is attained. Separate means which cause the yarn end to be released and which operate by extraneous action are, therefore, not

necessary.

The spindle head 1 has a recess 1d (FIG. 2) at its front side which engages and centers the head 3a of the bobbin core 3. The rim of the spindle head 1 facing the bobbin head has a projecting portion 15 (FIGS. 1 to 4) which has a concave recess within the range of rotary motion of hook 8 as is apparent particularly from FIG. 1. This recess permits the thread F to more readily enter into the operating range of book 8 as soon as the thread, during coil change, is placed in the vicinity of the spindle head. When during coil change the full bobbin 5 is pushed to the rear, the thread F is simultaneously shifted into engagement with hook 8 and, during the subsequent starting motion of the spindle head, is seized by the hook. Thus the thread is clamped fast between the book 8 and the front face of the spindle head shortly after initiation of spindle rotation. The clamping force must be so large that the thread will tear between the temporarily active thread-clamping device 7 (FIGS. 7, 8, 9) and the hook 8. According to a modification however, the clamping device 7 may be replaced by a combined clamping and cutting device which automatically severs the thread, for instance by a

cutter

16, 17 as illustrated in FIGS. 5 and 6. The cutter is preferably supplemented at the rear of the cutter blades 17 by a clamping member 18 which holds the end of the thread in clamped condition only until the thread is seized by the hook and is pulled out of the clamping engagement. As soon as the end of the thread F is seized and firmly clamped by book 8, three or four turns of spindle head and bobbin core are usually sufficient to make the thread self-adhering to the bobbin core. After a few turns are wound up, the yarn end becomes covered by layers of thread and is thus fixed upon the core of the coil so that the yarn end cannot unwind itself when being released by the gripper 8. As aforesaid, for thus covering the starting end of the yarn, two to three rotations of the winding spindle are necessary. The release of the yarn end fixed to the gripper hook 8 is preferably effected by centrifugal force. When first starting the winding operation, the winding spindle requires some period of time and consequently a number of rotations in order to reach its full speed. This number is approximately 10 to 15 revolutions of the winding spindle.

During the subsequent starting operation, while the rotating speed of the spindle head is gradually increasing, the unbalance weight 9 is subjected to an accelerating force A (FIGS. 3, 10) which retains the weight and acts in opposition to the direction of the rotating motion denoted by the arrow 10. Consequently, at first, the hook 8 also remains turned forward in the direction of rotation 1c (FIG. 3). However, when the rotary speed of the spindle head reaches a considerably higher value which may occur already after a few turns of thread are wound, then a centrifugal force C (FIGS. 10, 4, l1)

becomes increasingly effective in addition to the force of acceleration A, because the gravity center S (FIGS. 3, 4) of the weight 9 is not located on the pivot axis which is identical with the axis of shaft 10. Consequently, the unbalance weight 9 remains in the position of FIG. 3 only as long as the centrifugal force 3, or its active component, does not exceed the counteracting force of component of acceleration. However, when the speed of spindle rotation reaches its rated value, the centrifugal force C (FIGS. 4, 11) considerably exceeds the force of acceleration. The resultant force R then flings the balance weight 9 out to the position shown in FIG. 4. During this movement, shaft also rotates the hook 8 about its pivot axis in opposition to the direction of rotat'ion 1c, i.e. to the rear. Since, as described above, the rotary movement of unbalance weight 9 produces an axial displacement of the hook 8, the hook now releases the thread F which is flung upwardly by centrifugal force and enters into the range of the turns of thread being wound near the bobbin head 3a. As a result, only a few turns, for instance, three or four, are sufficient to thus wind the end of the thread into the starting portion of the bobbin being wound.

As a result, the starting end of the yarn or the bobbin is firmly and reliably coiled into and beneath layers of yarn and can no longer protrude or hang out of the bobbin. Approximately twenty turns are sufficient, for instance, to completely cover the yarn end.

In FIGS. 10 and 11 there is shown how the effects of the individual forces combine with each other in accordance with a force vector diagram, or parallelogram. The centrifugal force, aside from overcoming the spring force 13, is also required to overcome the force of acceleration during the starting operation, which accelerating force is effective upon the center of gravity S of body 9 only during the starting period. However, when the spindle head 10 has approximately attained its highest speed of rotation, then the acceleration has become small, as is shown in the vector diagram of FIG. 11, whereas the centrifugal force has become large. Consequently, the resultant force R acting at the gravity center S is also large, so that the body 9 turns outwardly with the effect of causing the above-described rotating motion of the catch member 8 and the subsequent release of the yarn 11.

It will be recognized that in a device according to the invention, the spindle head with its gripping and clamping device is active during the starting period of the spindle to catch the thread, to clamp it, and to again release it after a given interval of starting operation. Utilized for performing this automatic operation isthe force of acceleration acting upon an unbalance weight, and also the centrifugal force which subsequently overpowers the effect of acceleration I upon the weight. Switching from clamping to releasing of the thread occurs when a given revolving speed is exceeded. The angle of rotating motion traversed by the unbalance weight during the just-mentioned starting interval is less than 180. In many cases an angular movement of about 90 is sufficient. The angular position of the clamping hook 8 is preferably so chosen that, when starting, it forms an angle of about 45 with the spindle radius extending through the pivot axis of the hook, whereas after the releasing motion the hook 8 forms about the same angle of 45 with the same radius in the opposite direction.

According to another feature of my invention, the control of the gripping and clamping device of the spindle head is effected by means extraneous to the spindle head and of the parts rotating together therewith. Embodiments of this kind are illustrated in FIGS. 12 and 13.

According to FIG. 12, the unbalance weight in a device otherwise similar to that described with reference to FIGS. 1 through 11, is substituted by the armature 21 of an electromagnetic device, the armature cooperates with a stationary field system 22 of annular shape which surrounds the spindle head 1 and forms a pole gap of annular shape adjacent to the path of rotation of the armature 21 about the spindle 1a. When the coil 22a of the magnet system 22 is electrically excited, the field magnet attracts the armature 21. Mounted on the armature 21 is a cam 11' which cooperates with a cam face 12' of the spindle head 1 to impart rotating movement to the armature 21 about the axis of the hook shaft 10 when the armature 21 is moved by magnet 22 toward the left. Consequently, the axial movement of hook 8 caused by the excitation of magnet 22 is accompanied by a rotating movement of hook 8 so that the hook, when magnet 22 is excited, is placed into thread-clamping position. The electromagnet is excited only when the spindle'la is stopped and during the starting interval, but is switched off during the coil winding operation as soon as a given revolving speed or the rated speed is reached.

In the modification illustrated in FIG. 13, otherwise similar to the device described with reference to FIGS. 1 through 11, the operation of clamping hook 8 is controlled by extraneous mechanical means. The hook shaft 10' is designed as a threaded spindle of high pitch which is in threaded engagement with the spindle head 1 so that axial displacement of shaft 10 is accompanied by the desired rotating movement of shaft 10' and hook 8. The shaft 10 has a cam 23 for cooperation with the respective slide-cam: faces of

twocam members

24 and 25. The cam members 24, 25' have limited length in the peripheral direction of the spindle head and each acts upon the cam 23 as the cam passes by the

member

24 or 25, provided the cam member is shifted into the path of cam 23. Displacement of the

cam members

24 and 25 in the directions indicated by respective arrows 24a and 25a thus causes the shaft 10' to shift axially and to simultaneously rotate the hook 8. The proper clamping and releasing positions of hook 8 are secured by means of

catches

26 and 27 each comprising a spring located in a bore of spindle head 1 and a spring-biased ball which catches into a groove or recess of shaft 10 in one or the other limit position of the hook 8. The actuation of

cam members

24 and 25 is effected either mechanically or in any other desired manner in conjunction with the coil changing operation.

In the embodiment shown in FIGS. 15 and 16, which otherwise is similar to those previously described, a propeller vane or a small turbine wheel 32 is mounted on the shaft 10 of hook 8. Turbine wheel 32 extends on one side into the spindle head 1 and protrudes therefrom on the other side. Whilethe spindle head rotation is just beginning, and as long as the speed thereof is still slow, the vaned wheel 32 has toovercome only slight air resistance. Consequently, the force acting upon the protruding portion of the wheel and stemming from the air resistance can exert only a slight torque upon the shaft 10. With increasing speed of the spindle head 1, however, the force acting upon the vaned wheel 32 likewise increases. The spring 13 and the vanes of wheel 32 are so dimensioned that shortly before attaining the normal operating speed of the spindle head, the force acting upon the vaned wheel 32 is large enough to overcome the force of spring 13. Then the shaft 10 of the gripper hook 8 is turned as a result of the torque imposed upon the shaft by the vaned wheel 32. Simultaneously with the rotating motion, the gripper shaft 10 is axially displaced by the cam portion 11 sliding upon the cam 12. Hence, the gripper book 8 is also displaced axially, thus releasing the yarn end. Once the yarn end is released, it follows the centrifugal force and hence protrudes perpendicularly away from the axis of the coil core. It is it relevant whether the yarn end is then straight or has a curved shape, and it in any event becomes covered by subsequent turns of yarn being wound up. Only when the spindle head 1 rotates at sufficiently high speed, is the force exerted upon member 32 by air friction so large as to cause rotation of shaft 10 relative to the spindle head. Cam faces at 11, 12 are provided as in the above-described embodiments for producing a simultaneous axial movement of shaft and book 8. In such a device, the air current can be utilized not only for the control of the hook 8 but also for acting upon the end of the thread as soon as it is released from hook 8 so that the end is caused to flutter. This has the effect of bringing the thread end, at least temporarily, into the range of the thread running onto the bobbin core, thus expediting the coiling and covering of the loose end into the layers of thread being wound onto the core.

Devices according to the invention may further be equipped with a guide member 31 as illustrated in FIG. 14. The guide member 31 consists of wire and is located in the vicinity of the bobbin head. It enters into the path of the loose thread end, as soon as the end is released by the hook 8, with the effect of urging the hook temporarily toward the axis of the bobbin and producing a flutter motion of the thread end. This flutter motion is produced as close as possible to the running-on point of the thread being wound so that the free end is readily caught by the incoming thread and is securely covered by the first few turns of thread being wound onto the core. The guide member 31, as shown in FIG. 14, may be mounted on the clamping or cutting device 7 because this device, after starting of the new coil has terminated its clamping or cutting activity for the particular coil being wound. Consequently, the thread end is moved close to the running-on point of the incoming thread F in the direction required for having the loose end covered by the thread. The position occupied by device 7 and member 31 when thus effective is shown in FIG. 14 by dotand-dash lines. Guide member 31 is affixed to carrying arm 7 which clamps the yarn during the coil exchange.

It will be apparent to those skilled in the art that my invention permits of various modifications and may be embodied or performed in devices other than those particularly illustrated and described, without departing from the essential features of my invention and within the scope of the claims annexed hereto.

I claim:

1. In a yarn-coil winding machine, a device for startmg a coil winding operation after completion of the precedingly wound coil, comprising a revolvable spindle head having means for entraining a coil core, a thread guide defining a path for the yarn to be wound onto the core, a yarn clamping device having an eccentrically disposed shaft journalled in said spindle head in parallel relation to and oflset with respect to the axis of revolution, said shaft being axially and revolvably displaceable relative to said spindle head, said clamping device having a yarnclampmg member mounted on and comprising an angular extension of said shaft on the spindle-head side facing the core, and said device having automatic means cooperatively joined with said shaft for causing automatic simultaneous axial displacement and revolution of said shaft was to move said clamping member angularly as well as axially between yarn-clamping and yarn-releasing positrons, the angular movement causing the displacement of the yarn-clamping surface of the clamping member in a direction having at least a substantial radial component, said automatic means being adapted to actuate said clamping device to clamp the yarn end only during the starting interval of said spindle head, the yarn end when released being wound into and beneath the yarn layers subsequently wound onto the core.

2. In a coil starting device according to claim 1, said automatic means comprising a weight pivotally mounted on said spindle head and movable between two angular positions relative thereto to produce said radial displacement, said weight being connected with said shaft for imparting control motion thereto and being subject to force of peripheral linear acceleration and centrifugal force due to revolution of said spindle head, said force of peripheral linear acceleration having relative to said weight a direction corresponding to movement of said clamping member toward the yarn clamping position, and said centrifugal force having relative to said weight a direction corresponding to movement of said clamping member toward the yarn releasing position, whereby said weight causes said clamping device to clamp the yarn end at the start of the coil winding operation and to release the yarn end due to acceleration of said spindle head shortly prior to reaching the rated winding speed.

3. In a coil starting device according to claim 2, said weight being fixedly mounted on said shaft, and the respective centers of gravity of said weight and of said clamping member being located on respective radii angularly spaced approximately 45 from each other.

4. In a coil starting device according to claim 2, said shaft and said clamping member having a range of angular movement of approximately 5. A coil starting device according to claim 1, comprising a yarn deflector member mounted near said spindle head and displaceable into the path of the yarn end when the yarn end is released from said clamping device, whereby the yarn end is urged toward and beneath the incoming yarn being wound.

6. In a yarn-coil winding machine, a device for starting a coil winding operation after completion of the preceding coil, comprising a revolvable spindle head having means for entraining a coil core, a thread guide defining a path for the yarn to be wound onto the core, a yarn clamping device mounted on and rotating at the same angular velocity and about the same axis, as said spindle head, said clamping device having a yarn clamping portion displaceable in a direction having a radial component, said portion being engageable with the yarn coming from said guide, said portion being radially displaceable between yarn clamping and yarn releasing positions, and automatic control means connected with said clamping device for causing said portion to be displaced radially to keep the yarn end clamped during the starting interval of said spindle head and to subsequently be displaced radially in opposite direction to release the yarn end, the yarn end when released being wound into and beneath the yarn layers that have been wound onto the core.

7. In a yarn-coil winding machine, a device for starting a coil winding operation, comprising a revolvable spindle head for entraining a coil core on which the yarn is to be wound, a yarn clamping device comprising a clamping member mounted for movement longitudinally of the rotational axis of the spindle head and for rotation about said axis at the same angular velocity as the spindle head, the clamping member having pivot means permitting it to also turn in a plane transverse to said rotational axis, automatic means to shift the member longitudinally and to turn it in one direction transversely to hold the beginning portion of the yarn while the coil is started on the coil core, and to shift the member longitudinally in the opposite direction and to turn it in another direction transversely to release the said portion after a few turns of the coil have been wound on the core.

8. In a yarn-coil winding machine, a device for starting a coil winding operation, comprising a revolvable spindle head for entraining a coil core on which the yarn is to be wound, a yarn clamping device comprising a clamping member mounted for movement longitudinally of the rotational axis of the spindle head and for rotation about said axis at the same angular velocity as the spindle head, the clamping member having pivot means permitting it to also turn in a plane transverse to said rotational axis, automatic means to shift the member longitudinally and to turn it in one direction transversely to hold the beginning portion of the yarn while the coil is started on the coil core, and to shift the member longitudinally in the opposite direction and to turn it in another direction transversely to release the said portion after a few turns of the coil have been wound on the core, said automatic means comprising a weight mounted for rotation with and about the rotational axis of the spindle head, the weight being operatively connected to said clamping member, the Weight being urged radially outwardly when the rotational speed of the spindle reaches a predetermined value, to accomplish said release, the clamping device and the spindle head having abutting cam surfaces which cooperate to produce one of said longitudinal shifting movements.

9. In a yarn-coil winding machine, a device for starting a coil winding operation, comprising a revolvable spindle head for entraining a coil core on which the yarn is to be wound, a yarn clamping device comprising a clamping member mounted for movement longitudinally of the rotational axis of the spindle head and for rotation about said axis at the same angular velocity as the spindle head, the clamping member having pivot means permitting it to also turn in a plane transverse to said rotational axis, automatic means to shift the member longitudinally and to turn it in one direction transversely to hold the beginning portion of the yarn while the coil is started on the coil core, and to shift the member longitudinally in the opposite direction and to turn it in another direction transversely to release the said portion after a few turns of the coil have been wound on the core, said automatic means comprising an air resistance-driven turbine turning with the spindle head and connected to turn the clamping member on its pivot means when air friction is sufficiently great, the clamping device and the spindle head having abutting cam surfaces which cooperate to produce one of said longitudinal movements.

10. In a yarn-coil winding machine, a-device for starting a coil winding operation after completion of the precedingly wound coil, comprising a revolvable spindle head having means for entraining a coil core, a thread guide defining a path for the yarn to be wound onto the core,

a yarn clamping device having a shaft journalled in said spindle head in parallel relation to the axis of revolution, said shaft being axially and revolvably displaceable relative to said spindle head, said clamping device having a yarn-clamping hook member mounted on and comprising an angular extension of said shaft on the spindle-head side facing the core, the spindle head having on said side facing the core a rim having a recessed surface within the operating range of said hook member, and said device having means cooperatively joined with said shaft and abutting a surface of said spindle head for causing automatic simultaneous axial displacement and revolution of said shaft so as to move said clamping member angularly as well as axially between yarn-clamping and yarn-releasing positions, the angular movement causing the radial displacement of the yarn-clamping surface of the clamping hook member, and automatic control means for actuating said clamping device to clamp the yarn end between the hook member and said recessed surface only during the starting interval of said spindle head, the yarn end when released being wound into and beneath the yarn layers subsequently wound onto the core, said automatic means comprising a weight eccentrically pivoted on a pivot which is mounted for rotation with and about the rotational axis of the spindle head, the weight being operatively connected with the clamping member, the Weight being urged to turn on its pivot outwardly from the spindle head axis when the rotational speed of the spindle head re aches a predetermined value.

References Cited in the file of this patent UNITED STATES PATENTS 2,657,867 Furst Nov. 3, 1953 2,692,089 Siegenthaler Oct. 19, 1954 2,718,360 Joyce Sept. 20, 1955 FOREIGN PATENTS 712,617 Great Britain July 28, 1954;