Devices for producing thread or yarn reserve windings are commonly known in practical use, which are either relatively simple but depend on the thread tension, or which are rela¬ tively complex due to the elements to be controlled if they are independent of the thread tension.

In the German DOS 2*347'644 e.g. a device depending on the thread tension is described, in which the thread to be placed onto the bobbin tube is guided by a mobile suction gun to a thread stop, which is held back magnetically, and subsequent- ly is guided into the thread catching zone at the face side of the tube for taking up the thread on the bobbin tube. After the thread is taken over by the rotating tube, a force increasingly acting onto the aforementioned thread stop is generated, which force pivots the stop out of the magnetic field, in which process the thread after initially forming thread reserve layers moves towardsthe centre of the bobbin tube, i.e. into the zone of thread traversing otion.

Devices depending on the thread tension of such typashow the disadvantage that the number of windings, or the distance between windings respectively, vary according to the thread tension which is adapted to the winding speed and to the

thread material processed.

A device, which functions independently of the thread tension but is relatively complicated, is described in German DAS 1'806'243, in which device the thread reserve windings are for ed by a lever arrangement activated stepwise by the tra- versing motion device.

It thus is the object of the present invention to create an apparatus, which functions independently of thread tension, and using which the thread in ost simple Operation and with simplest design can be transferred onto the rotating bobbin tube for producing thread reserve windings.

This object is achieved by the apparatus described in claim Further advantageous embodiments of the present invention ar characterized in the subsequent Claims. Thus, as e.g. descri ed in claim .4 the functions of the lever and of the force means are combined in advantageous manner by designing the second lever as a flat spring.

Furthermore, by the elements described in claim 5, and their combination respectively, a sufficient dampening effect is achieved in simple manner.

The invention is described in more detail in the following with reference to illustrated design examples. It is shown i

Fig. 1 a schematic view of an apparatus for producing threa reserve windings, seen in axial direction of the bobbin tube,

Fig. 2 a schematic, partial side view of the apparatus according to Fig. 1,

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Fig. 3 a simplified section of a detail of the apparatus,

Fig. 4 an alternative design example of the apparatus shown partially in a section parallel to the bobbin axis,

Fig. 5 the apparatus according to Fig. 4 shown in a section along the line V - V of Fig. 4.

An apparatus 1 for producing thread reserve windings on a bobbin tube 2 placed on a rotating bobbin chuck 3 comprises a lever 5 pivotable about an axis 4, with a thread guide 6, and a lever 7, also pivotable about the axis 4, arranged, as seen in longitudinal direction towards the bobbin centre, behind the lever 5. The lever 5 as well as the lever 7 each are connected via a tension spring 8, and 9 respectively, with a base plate 10. The base plate 10 in turn is rigidly connected with a machine frame 27 (indicated merely) of the winding device. The axis 4 is rigidly mounted in a support member 11 mounted onto the base plate 10.

The lever 5 further ore is provided with a carrier member 12 extending to below the lever 7.

Between the lever 7 and the base plate 10 a dampening element

13 is provided. The dampening element 13 consists of a cylindre 13 connected to the base plate 10 and- of a piston

14 connected with the lever 7. Between the part 14a of the piston 14, located in the cylindre 13a,and the inside wall of the cylindre 13a a highly viscuous oil (of e.g. a viscosi- ttyy ooff 1100 CCeennttii--SSttookkeess)) is provided, which dampens the move- ments of the piston 14.

The clearance between the piston part 14a and the inside wall of the cylindre is chosen such that the movement between the

piston 14 and the cylindre 13a is not prevented.

Instead of the combination shown, consisting of the cylindre 13a and the piston 14a, also a combination not shown can be provided, consisting of a plate connected to the base plate, and of a plate connected with the lever 7. A highly viscuous oil provided between the two plates da pens the movement of lever 7. The distance between the plates is chosen such that the oil substantially can not leak fro between the plates and, on the other hand, such that the relative movement of the plates is possible.

At the end of lever 7 furthermore a thread stop 15 is pro¬ vided.

On the end of the base plate 10 extending towards the bobbin tube, a plate 16 with a thread guide curve 17 is arranged, which curve 17 extends, as seen from the face side 18 of the tube in the direction of the bobbin tube centre, downward, i.e. extends inclined towards the base plate.

The bobbin tube is driven by a friction drive drum 19. If, after a new empty tube 2 is donned, the thread 22 being sucked off into an opening 20 of the suction tube 21, arrang ed below the lever 5, as shown in Fig. 2, is to be trans¬ ferred onto the bobbin tube 2 again for the subsequent next winding process, the thread 22 is taken by hand-, the lever 5 also manually is set back from its position A (Fig. 1) against the tension force of the spring 8 into the position B, and the thread 22, as indicated in Figures 1 and 2 with a solid line, is placed into the thread guide 6, and subse- quently the lever 5 is released again, in such manner that it moves back to its position A under the influence of the spring 8. In this position the thread 22 is deflected on the face side tube edge 24, as the thread 22 is guided in the

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thread guide 23 provided for forming the thread traversing triangle known as such, until it is caught by a thread catch- ing slot 25 located on the face side 18 of the tube 2 and is wound onto the bobbin tube end.

While the lever 5 is set back, as described above, the lever 7 also is lifted, activated by the carrier member 12, from an initial position (not indicated) into a position shown in Fig. 1, the force of the spring 9 being overcome in this pro- cess, in which position the thread stop 15 exceeds over the thread guide curve 17.

During the above mentioned winding process the thread, which tends towards the centre of the bobbin tube owing to the thread tension, is guided along the thread guide curve 17 (shown in Fig. 1) to the thread stop 15, and thus produces, owing to this thread stop, thread reserve windings until the spring 9 has pulled down the lever 7, delayed by the influ- ence of the dampening element 13, towards the aforementioned initial position, of the lever 7, thus far, that the thread 22 no longer is held back by the thread stop 15, continues to move along the thread guide curve 17 into the reachof a traversing thread guide 26 into the position indicated in Fig. 1 with broken lines, in such manner that the normal bobbin package winding process can start.

Instead of the lever 7 and of the spring 9 a flät spring (not shown) provided with the thread stop 15 can be applied, which is mounted onto the axis 4 and is pivotable in the sense of its bendability.

Instead of the tension Springs acting onto the levers, also pressure Springs can be applied.

In Figures 4 and 5 an alternative design example of the in ventive apparatus is shown schematically, only the element in the arrangement differing from the corresponding elemen described with reference to Figures 1 through 3 being illustrated.

The apparatus 27 for producing thread or yarn reserve wind ings on a bobbin tube also here comprises a lever 30, whic is arranged pivotable about an axis 28 on a hub 29, with a thread guide device 31. The axis 28 on both sides is rigid supported in a support 32. A force eans 33 in the form of e.g. a torsion spring, ensures that the lever 30 can be pivoted from its idling position illustrated in Figures 4 5 counterclockwise (according to the arrow m of Fig. 5) on if a torsion momentum is overcome.

On the axis 28 furthermore a sleeve 34 is supported, also rotatably,on the surface of which a thread stop 35 in the form of a small round rod (indicated in a cross-section in Fig. 4 and indicated with dash-dotted lines in ^' Fig. 5) ^' is provided.

A force means 36, provided also here in the form of a torsi spring, ensures that also the sleeve 34 with the thread st 35 can be rotated in the same direction as the lever 30 onl if a momentum is overcome. Whereas the lever 30, or the hu 29, under the influence of the spring 33 can be pivoted bac freely (not considering the neglegible friction .between the hub 29 and the axis 28), the sleeve 34 can be rotated back under the dampening influence of the spring 36, as accordin

34 to the invention the thread stop 35 (or the sleeve support- ing it, respectively) , which is arranged rotatable about th axis 28, is provided with a dampening element. The dampenin element 37 consists of a highly viscuous oil, which fills the annular gap 37a between the inner cylindrical surface 38 of the sleeve 34 and the outer cylindrical surface 39 of

the collar 40, which is rigidly connected with the support 32 and extends into the sleeve 34. The annular gap 37a, if re- quired, is sealed by suitable seals not shown. The sleeve 34 thus can be rotated on the axis 28 only if predetermined friction forces exerting a dampening action are overcome.

In the sleeve 34 furthermore a carrier member,designed in the form of a pin 41,is rigidly achored, which with its free end extends into a kidney-shaped groove 42 provided in the hub 29. In the idling position of the apparatus illustrated in Fig. 5 the groove 42 is laid out such that the pin 41 is located with its end in the groove 42.

If now for the formation of the thread reserve the lever 30 is pivoted manually counterclockwise ^" (arrow m, ^' Fig. 5) , which corresponds to the pivoting of the lever 5 from the position A into the position B as described with reference to Figures 1 through 3, also the sleeve 34, and thus the thread stop 35, are carried on, or rotated, respectively, counterclockwise by the pin 41.

The thread stop 35 thus is brought into the position shown in Fig. 1 for the thread stop 15, in which position it protrudes over the thread guide curve (not shown, but corresponds exact- ly to the thread guide curve 17 shown in Fig. 1) and thus re- tains the thread for the formation of the thread reserve wind¬ ings. ^«•

If the lever 30 now is released, it jumps back to its initial position immediately (clockwise) under the influence of the spring 33, whereas the sleeve 34 rotates back slowly, against the friction forces of the dampening element 37, which must be overcome, unter the influence of the spring 36. The pin 41 in this process slowly oves freely in the groove 42.

The operational function of the apparatus according to Figur 4 and 5 entirely corresponds to the one of the apparatus des cribed with reference to Figures 1 through 3 and thus does n require repeated description of its function. Instead of the dampening element 37 (i.e. the oil layer or film) of course any other element dampening the rotational movement of the sleeve 34 can be applied.

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