EP0210183A1

EP0210183A1 - Open-end spinning machine with a plurality of spinning points, whose spinning elements are driven jointly by a combined drive.

Info

Publication number: EP0210183A1
Application number: EP86900066A
Authority: EP
Inventors: Eberhard Grimm; Rudolf Oexler; Martin Ostermaier; Kurt Beitzinger
Original assignee: Schubert und Salzer Maschinenfabrik AG
Current assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
Priority date: 1984-12-24
Filing date: 1985-12-20
Publication date: 1987-02-04
Also published as: CZ973285A3; CZ280812B6; US4760688A; EP0210183B1; SU1584753A3; CN85109711A; JPS62502126A; DE3447428A1; CN1020640C; DE3566685D1; BR8507083A; WO1986003792A1; JPH0723565B2; DE3447428C2; IN167042B

Abstract

Métier à filer open-end dans lequel un entraînement commun (56) est prévu pour l'entraînement commun d'éléments de filature (1) d'une pluralité de points de filature (S) disposés les uns à côté des autres. Au point de filature (S) est prévu un dispositif de commutation (2), au moyen duquel ce point de filature (3) peut être commuté sur un entraînement auxiliaire fixe (57). L'entraînement commun (56) possède une courroie d'entraînement principale (5) pour l'entraînement commun de cette pluralité d'éléments de filature (1), ainsi qu'une courroie d'entraînement auxiliaire (53) entraînée à une seconde vitesse pour l'entraînement individuel d'un ensemble de filature (1). Au moyen du dispositif de commutation (2) la courroie d'entraînement principale (5) ou la courroie d'entraînement auxiliaire (53) peut être utilisée comme entraînement de l'ensemble de filature (1). Le raccordement des fils s'effectue à une vitesse de rotor proche de celle utilisée lors de la fabrication.Open-end spinning machine in which a common drive (56) is provided for the common drive of spinning elements (1) from a plurality of spinning points (S) arranged next to each other. A switching device (2) is provided at the spinning point (S), by means of which this spinning point (3) can be switched to a fixed auxiliary drive (57). The common drive (56) has a main drive belt (5) for the common drive of this plurality of spinning elements (1), as well as an auxiliary drive belt (53) driven at a second. speed for the individual drive of a spinning unit (1). By means of the switching device (2) the main drive belt (5) or the auxiliary drive belt (53) can be used as a drive for the spinning unit (1). The wires are connected at a rotor speed close to that used during manufacture.

Description

Open-end spinning machine with a large number of spinning stations arranged side by side, the spinning elements of which are driven together by a collective drive, and method for piecing

The present invention relates to an open-end spinning machine with a large number of spinning stations arranged side by side, the spinning elements of which are driven together by a collective drive, and to a method for spinning on the spinning stations.

It is known to carry out the piecing process at a reduced rotor speed, the speeds of fiber feeding and thread take-off being adapted to this reduced rotor speed in such a way that the rotor speed ratio between the individual spinning elements, which is predetermined for the spinning production, is always maintained (DE-OS 2.058 .604). In order to easily achieve this reduced rotor speed for spinning on a single spinning station with a large number of jointly driven spinning stations, the speed of the spinning rotor is scanned for the production speed during the run-up and the piecing process when the reduced speed is reached speed initiated (DE-AS 2.341.528 and DE-OS 2.610.575). However, the time available here and the rotor speed are not constant and vary in particular depending on the running state of the machine and the individual rotor bearings. This affects not only the piecing success, but also the speed and quality of the piecing.

^ s--. 1 It is also known to have between one per spinning station

2 drive belts and the rotor shaft a transmission gear

3 be used with two specified gear ratios

₄ hen, which alternately take over the drive of the spinning rotor c for piecing or for production ₆ (DE-OS 2,754,785, JP-PS-AS 21.966 / 84). As a result, _{η is} a percentage reduction in the piecing rotor speed

8 give, but always in a fixed relationship to the

9 Production rotor speed is set. The piecing speed is therefore 0 different depending on the production rotor speed. 1 2

The invention is based on the surprising finding that 3 the rotor speed for the attachment process should not always be 4 equally low and should not always be reduced in a fixed ratio to the production rotor speed. 6 The correct rotor spinning speed depends on the 7 spinning fiber material. It is therefore the purpose of the present invention to avoid the disadvantages shown above. In particular, it is 2 the object of the invention to create a simple device 3 with which a second rotor speed can be reached individually at a spinning station 4, which can be selected in a simple manner, regardless of the production speed, according to the spinning conditions. 7 ⁼ A further object of the invention is to create a piecing process which improves the success and the quality of the piecers. 1 2 This object is achieved in that, in addition to the collective drive, 3 a stationary 4 auxiliary drive is provided, which can be individually assigned to the spinning element of each 5 spinning station instead of the collective drive. This second, the spinning elements individually Deliverable stationary auxiliary drive can be adapted centrally to the piecing speed required for the respective fiber material, the rotor diameter etc. Since this setting is carried out once per machine or section, such an adaptation to another fiber section etc. takes place economically in terms of material and time. The auxiliary drive is advantageously located in the end frame of the machine.

For the purposes of the invention, the term “spinning element” is intended to encompass all elements which are required for the spinning process. This is preferably a spinning rotor, but in addition to a spinning rotor, this term is also intended to refer to a pair of friction rollers and other elements of a spinning station, such as e.g. the delivery roller, etc.

According to a preferred embodiment of the subject matter of the invention, a drive motor which is separate from the collective drive is assigned to the auxiliary drive. In this way, the speed ratio between the two drives can be controlled in a particularly simple manner.

In an alternative embodiment of the subject matter of the invention, however, a single drive motor can also be provided, which is assigned directly to the collective drive and to the auxiliary drive via a transmission gear.

For the purposes of the invention, the term “step-up gear” is understood to mean both a gear for translating and a gear for reducing the speed.

Depending on the production speed and the material to be spun, the gear ratio of the gear mechanism can advantageously be set between 95: 100 to 75: 100, so that the spinning speed of the spinning element 1 only 5% to 25% lower than the production

2 speed.

3

4 For many applications, it is not necessary to

5 that the spinning unit gently on the spinning speed

6 the production speed is accelerated. Invent

7 In accordance with this, for the translation transmission

8 be provided a step washer.

9

10 The transmission gear is preferably preferred

H continuously adjustable, it is advantageous if the

12 The speed of the auxiliary drive can be increased to the speed of the collective drive.

14

15 It has been shown that even if the

16 fiber beards through the fiber delivery device the fibers

17 do not suddenly get into the spinning element, but

18 that the amount of fibers entering the spinning element

19 increased along a ramp up until finally per

20 unit of time always the amount of fiber in the spinning element 2, which is determined by the delivery speed of the fiber 2? Device is specified. The auxiliary drive is now expediently not in any way, but along

_{24 of} this run-up curve of the amount of fiber arriving after the release of the fiber delivery device, c direction to the spinning element

2 ₅ nigbar.

27

- _c For many purposes it is also advantageous if the auxiliary

"~ Is reversible in its direction of rotation. This is true

__ especially for the friction rollers and the delivery roller

31 ^{CLOSE *}

32

33

34

35

36 Advantageously, the auxiliary drive can be controlled by a control device which is arranged on a maintenance device which can be moved along a large number of spinning stations and by which the entire piecing process is also controlled. According to a preferred embodiment of the invention, the control device controlling the auxiliary drive on the maintenance device is also connected in a control manner to an auxiliary drive device for the device pulling the thread during the piecing process. In this way, a thread take-off speed which is matched to the speed of the spinning element and the piecing process is achieved. The thread take-off speed can also be controlled asynchronously to the speed of the spinning element, for example to temporarily give the thread an increased rotation for the piecing process.

According to a preferred embodiment of the subject matter of the invention, the collective drive has a main drive belt for simultaneously driving a plurality of spinning elements and the auxiliary drive has an auxiliary drive belt for individually driving a spinning element. The main drive belt drives all normal spinning elements at the same speed during production. In contrast, spinning elements in which a thread is to be re-spun are separated from this main drive belt during the spinning phase and are instead individually driven by the auxiliary drive belt, which in turn is driven at a speed which differs from the speed of the main drive belt. Thus, the spinning element to be spun in each case has a different speed in comparison to the spinning elements driven at production speed of the undisturbed spinning stations. To save material and space, the auxiliary drive belt can be made narrower than the main drive belt. Since the auxiliary drive belt drives only one spinning element at a time, functional reliability is always guaranteed.

The selection of the desired drive for a particular spinning element is advantageously carried out with the aid of an individual switching device which alternately assigns one of the two drives to the spinning element, the switching device being acted upon by an elastic element such that the main drive belt when the switchover device is released, it can be brought or held against a drive element which is connected in a rotationally fixed manner to the spinning element.

A two-armed U shift lever is expediently provided for each spinning station, which lever carries a main pressure roller on one arm and an auxiliary pressure roller on its other arm for alternating engagement of the main drive belt or the auxiliary drive belt on the spinning element. In this way, a simple design of the subject matter of the invention is achieved.

In order to avoid additional operating elements per spinning station, the switching lever is preferably connected in terms of control to a brake for the spinning element. This tax-related connection can be implemented in various ways. According to a preferred embodiment of the device according to the invention, the brake is arranged on a brake lever carried by the changeover lever.

According to the invention, the brake for the spinning element and the switching device can be easily controlled in that the brake lever has at least one driver and by moving from a neutral spinning position In its end position forming the braking position, the main pressure roller lifts out of the main drive belt and, through its movement into the other end position forming the piecing position, causes the auxiliary pressure roller to bear against the auxiliary drive belt.

According to an advantageous embodiment of the subject matter of the invention, the brake lever is pivotally mounted at one end on the axis of the two-armed lever that carries the main drive roller, is connected at its free end to an actuating device, carries a braking surface between its two ends, and is so movable into its bre position that the brake lever, after reaching its braking position and continuing its movement by engaging its braking surface on the spinning element, causes the switching lever to pivot.

It is advantageous if the spinning element is in the immediate vicinity of the main pressure roller and the distance between the free, actuating end of the brake lever and the brake which can be brought into effect on the spinning element is greater than the distance between the brake and the bearing axis.

According to an advantageous constructive embodiment of the device according to the invention, an intermediate lever is assigned to the brake lever, which is pivotably mounted together with the changeover lever on a common axis and one end of which engages with the actuating device and the two-armed lever of the changeover device which overlaps the side facing away from the spinning element and the other end of which is connected in an articulated manner to the brake lever which engages under the two-armed switch lever on the side facing the spinning element. In this way, only small switching forces are required despite the short switching travel. In order to be able to reduce the driving forces for actuating the brake and the changeover device by more favorably selecting lever arms and drive torques and to increase operational safety, the brake lever is preferably mounted independently of the two-armed lever of the changeover device, with the brake lever on both sides has a driver of the pivot axis of the two-armed switching lever for optionally pivoting the two-armed switching lever in one or the other pivoting direction. Due to the fact that the brake lever is mounted independently of the changeover lever, its pivot point can be selected so that the brake performs an essentially linear movement when it is moved into or out of the braking position. This increases the safety of the device against firing.

In an expedient development of such an embodiment of the subject matter of the invention, the shaft of a spinning element designed as a spinning rotor is mounted in a wedge gap formed by support disks, while the brake lever is movable in the direction of the support disks during its braking movement. This results in particularly advantageous space conditions if the shaft of the spinning rotor is supported with respect to the drive belt and the auxiliary drive belt on the side facing the spinning rotor by a single pair of support disks and on the side facing away from the spinning rotor by a combined axial / radial bearing.

In the case of fully automatic open-end spinning machines, a maintenance device which can be moved along a multiplicity of spinning stations is usually provided, which can optionally be delivered to each spinning station. Here, the maintenance device advantageously has a drive device that can be controlled by a control program for actuating the changeover device. The switchover device for selectively assigning the collective drive or the central auxiliary drive to a spinning element per spinning station is preferably assigned a control lever which can be pivoted relative to a hinged cover which covers the spinning station. This control lever permits simple control of the device according to the invention, in particular when, in a further expedient embodiment of the subject of the invention, the control lever can assume three relative positions with respect to the cover, in its basic position it is flush with the cover, in its braking position out of the cover is pivoted out and pressed into the cover in its piecing position.

In order to enable the device according to the invention to be controlled manually in a simple manner, a locking device is expediently assigned to the control lever. During the piecing process, the operator needs both hands for lifting the bobbin, searching for and returning the thread, lowering the bobbin and switching on the fiber feed. The locking device is the prerequisite for the operator not also having to keep the control lever in its piecing position during the piecing process.

If, in a further embodiment of the subject of the invention, the locking device is acted upon elastically in such a way that it allows the control lever to move into the piecing position, but prevents return to the production position, and a controllable electromagnet is also assigned to the locking device, then the release can be made of the control lever so that it returns to the production position, can be easily controlled by means of an electrical switch. This switch is advantageously the switching device which controls the fiber feed, for which purpose the electronics , tromagnet controlled with this with the fiber feeding-

_{2 is connected to} the switching device.

3

4 To prevent the main pinch roller and its position

5 due to a possible imbalance in the spinning element

6 is subject to premature wear is advantageous

7 assigned a damping device to the switching lever.

3 This is expediently designed as friction damping, which is preferably arranged in the bearing of the changeover lever. 1

12 The device described above in the construction makes it possible

13 in a simple way, the piecing in an optimal way.

14 feed. It is for a constant yarn character

15 of essential importance that the rotor speed is kept substantially constant during the spinning process 6

Turns 17. The yarn production already begins during the spinning process, which is why, according to the invention, piecing advantageously takes place at a rotor speed close to the production rotor speed, the piecing rotor speed depending on the fiber material to be spun.

22 rial, rotor diameter etc. selected as high as possible

2 will.

24

25 It has been shown that, as a rule, optimal results

26 se at a piecing rotor speed during piecing

27 can be achieved, which is 5% to 25% below the production rotor speed.

29

30 The device according to the invention enables without pro

31 spinning station requires a single drive for the spinning element

32 is, in a simple and safe manner, that each

33 Spinning element at the desired time in the desired duration

34 has defined piecing speed. hereby

35 a given piecing program can be used,

36 The piecing security is compared to the known state - 11 -

¹ the technology is significantly increased and the attachments are

2 firmer and firmer. 3

⁴ Several embodiments of the invention are described below.

5 fertilized explained with reference to drawings. It shows: 6

⁷ Fig. 1 in a schematic plan view of an embodiment

8 of the subject matter of the invention with two drive

9 belts as well as a switch lever for changing the 0 drive belts into and out of action; 2 3 Figure 2 shows a modification of the subject matter 4 in plan view. 5 6 Figure 3 in the diagram a further modification with a 7 continuously variable transmission 8 according to the invention; 4 in a schematic front view one with a

21 brake-coupled device according to the 2 invention for the optional drive of a spinning

23 rotors with the operating speed or one

24 lower starting speed; 25

5 a modification of the pre-shown in FIG.

27 direction in the front view; <_ö

29 FIG. 6 an inventive spinning position

30 le and one working with it

31 Maintenance device in the transverse transverse

32 cut; 33

34 FIG. 7 a damping device for the

35 device in section; 36 1 to 8 in a schematic front view the preferred

2nd training of the subject of the invention with

3 a switching lever and one of these

4 dependent brake levers in the

5 spinning, spinning or braking position;

6

7 Fig. 11 in a schematic side view of a spinning

8 digits with a pair of friction rollers as well

9 a delivery roller, each with a first 0 and a second drive; and 1 2 FIG. 12 in a schematic side view of a spinning 3-position cover and a control lever ₄ which are particularly suitable 5 for manual control 5 of the device according to the invention. The invention is first explained using the example of the embodiment shown in FIG. 1. At each spinning station S, a spinning element designed as a spinning rotor 1 is provided. i The spinning rotor 1 is supported 2 by means of a shaft 10 and is driven by means of a main drive belt 5. This main drive belt 5 is part of a collective drive 56, by means of which the spinning rotors 1 of a plurality of spinning stations S arranged next to one another are driven simultaneously with the spinning rotor 1 of the spinning station S shown via this main driving belt 5. The main drive belt 5 in turn er¬ 9 keeps its drive from a main motor 54 in Maschi¬ 0 NEN-engine frame 500, which is controlled by a control device 6 in ₁ desired. 2 3 In addition to the aforementioned collective drive 56, a stationary auxiliary drive 57 is also provided, which has an auxiliary drive belt 5 which, in addition to the main drive belt 5, drives the spinning rotors 1 with normal ones Spinning speed extends along the machine. While the main drive belt 5 is intended to drive a plurality of spinning rotors 1 together, the auxiliary drive belt 53 has the task of driving only a single spinning rotor 1 in the piecing phase. For this reason, the auxiliary drive belt 53 does not need to be designed as strong, so that a smaller width in comparison to the width of the main drive belt 5 is sufficient for it. This has a favorable effect on the space required.

1 shows, as the central drive for the auxiliary drive belt 53, a step-up transmission 3 with a step pulley 34. This has a first length section 340 with a larger diameter for driving the main drive belt 5 and a second length section 341 with a smaller diameter Drive of the auxiliary drive belt 53. The diameter ratio between the length sections 340 and 341 determines the gradation between the production speed and the clamping speed of the spinning rotor 1.

The shaft 10 is mounted with its end facing the spinning rotor 1 in the gusset of a pair of support rollers 11. Its end 100 facing away from the spinning rotor 1 is reduced in diameter and is supported by a combined axial / radial bearing 13 (FIG. 6).

At each spinning station S there is a changeover device 2 with a two-armed changeover lever 20 which is pivotably mounted on an axis 201. On one arm 230, this changeover lever 20 carries a main pressure roller 211, which can be brought into contact with the main drive belt 5, while the changeover lever 20 carries on its other arm 231 an auxiliary pressure roller 212, which can be brought into contact with the auxiliary drive belt 53. Between the individual spinning positions S there are support disks 50 and 51 (FIG. 8), which lift the main drive belt 5 or the auxiliary drive belt 53 from the shaft 10 of the spinning rotor 1 when released by the main pressure roller 211 or the auxiliary pressure roller 212. In this way, only the belt 5 or 53 lies against the shaft 10 of the spinning rotor 1, which is forced to this system by the corresponding pressure roller 211 or 212.

If a thread is to be individually spun at a spinning station S after a thread break or for any other reason, the changeover lever 20 is pivoted at the relevant spinning station S in a manner which will be explained in more detail below in such a way that the main pressure roller - Le 211 releases the main drive belt 5 so that the support pulleys 50 and 51 lift this main drive belt 5 off the shaft 10 and the auxiliary pressure roller 212 presses the auxiliary drive belt 53 against the shaft 10 of the spinning rotor 1. The spinning rotor 1 of this spinning station S is thus separated from the collective drive formed by the main drive belt 5 and is now driven at the lower piecing speed.

After piecing, the normal spinning speed is selected again by changing over the changeover lever 20, in that the auxiliary pressure roller 212 releases the auxiliary drive belt 53 - which now stands out from the shaft 10 - and the main pressure roller 211 the main drive belt 5 on the shaft 10 of the spinning rotor 1 presses.

The changeover lever 20 thus optionally brings the main drive belt 5 or the auxiliary drive belt 53 to act on the spinning rotor 1. The switching lever 20 can be controlled in various ways, as will be explained later with reference to various exemplary embodiments. In the simplest case, the switching lever 20 is pivoted by hand.

The setting of the piecing speed by changing the transmission ratio takes place by appropriate selection of the stepped disk 34 in the drive frame 500 of the machine. The speed ratio is thus set for all spinning positions S of the machine, so that the desired adaptation can be achieved quickly when changing lots, yarn numbers or rotors etc.

FIG. 2 shows a modification of the central drive for the auxiliary drive belt 53 shown in FIG. 1. This central drive allows the speed of the auxiliary drive belt to ramp up in a controlled manner. 53. In this exemplary embodiment, both the main drive belt 5 and the auxiliary drive belt 53 are driven from a central location, namely the drive frame 500, which for this purpose also has an auxiliary drive motor 530 in addition to the already mentioned main motor 54. The main drive belt 5 is driven by the main motor 54 via a pulley 540. The speed for the motor 54 and thus for the main drive belt 5 is determined by the control device 6 already mentioned in connection with FIG. 1. The auxiliary drive pulley 53 is driven by the auxiliary drive motor 530 via a pulley 531. A control device 63 is assigned to the auxiliary drive motor 530, by means of which the speed for the auxiliary drive motor 530 and thus for the auxiliary drive belt 53 is determined. The auxiliary drive motor 530 drives the auxiliary drive belt 53 at a speed which is lower than the speed of the main drive belt 5. It has been shown that, depending on the intended rotational speed of the spinning rotor 1 and its diameter, a piecing speed of the spinning rotor 1 of 75% to 95% of the normal production speed of the spinning rotor 1 ensures a particularly safe piecing. For this reason, the speed difference is chosen so that the speed ratio between piecing speed and spinning speed is in the range between 95: 100 and 2 75: 100.

4 The speed gradation is preselected by setting the control devices 6 and 63 accordingly. It can be provided that, with the help of the control device 63, the speed of the auxiliary drive motor 530 after spinning has been increased to such an extent that the 9 main drive belt 5 and the auxiliary drive belt 53 0 finally have the same speed. For this purpose, a coupling (not shown 2) can be provided between the control devices 6 and 63, which also takes into account any 3 dimensional differences of the pulley 540 and 531 ₄ . 5 5 The piecing cannot always be carried out optimally at the same piecing speed. Depending on the fiber material to be spun, the yarn number, the rotor diameter, etc., a different piecing speed 0 must be selected for piecing in order to achieve perfect piecing in terms of strength and appearance. For this reason, the speed of the auxiliary drive motor 530 in comparison with the main motor 54 is selected in such a way that the speed of the motor is 5, depending on the given conditions, which are essentially influenced by the factors mentioned above Spinning rotor 1 25% to 5% below normal 1 production speed, which the spinning rotors 1

2 is issued using the main drive belt 5. 3

4 The higher the piecing rotor speed, i.e. the less

5 it deviates from the production rotor speed, the less

6 eng the character of the piecer and the following

7 following yarn section from the rest of the yarn. For this reason, the aim is to carry out the piecing at the highest possible rotor speed. Depending on the elasticity of the fiber material, the same speed for the spinning rotor 1 cannot be selected in each case. 2 If the rotor speed is too high, the yarn in the process of 3 formation is overturned and therefore twisted off, 4 so that the thread breaks. If the rotor speed 5 is too low, the piecing deviates too much from the remaining 6 yarn. Particularly in the case of living fiber materials such as 7 cotton or wool, the application is therefore carried out at an 8 rotor speed which is only 5% to 25% below g of the production rotor speed. 0 i By ramping up the rotor speed from the piecing 2 speed to the normal spinning speed for the subsequent 3 transition of the rotor drive from the auxiliary drive belt 53 to the main drive belt 5, the transfer to the 5 main drive can be carried out without jump and thus gentle on the yarn. 5 Less yarn breaks are the result. 7 3 It has been shown that the fibers do not suddenly enter the spinning rotor 1 after piecing 9. The delivery device (not shown in FIG. 0) in the form of a fiber beard 2 i has different lengths of 32 and is therefore not released at the same time after the delivery device _C 3 is switched on again. First are

3 ₄ there are only a few fibers that are also not from the

35 shown dissolving device are conveyed 35 to the spinning rotor 1. Over time it will become more, until finally the 2 normal delivery quantity reached the spinning rotor 1. The fiber

2 amount that gets into the spinning rotor 1 increases

3 along a run-up curve, the course of which varies

₄ factors such as fiber length, delivery speed etc.

5 depends.

6

7 The run-up curve of the

₈ controlled Hil drive motor 530 can be connected to the ramp-up

₉ ve of the amount of fibers that after spinning in the Spinnro¬

10 gate 1 arrives, be adjusted so that a

, Stantes relationship between two run-up curves Closing is hold _12th

_13. In the embodiment shown in Fig. 3, the

, _c pulley 531 of the auxiliary drive belt 53 also - _ ₆ as shown in Fig. 1 - with the interposition of a Über¬

17 setting gear 3 from the main drive motor 54 from 18 ben. At this point there is a cone wheel 55 of a 21 cone gear transmission on the shaft 541, on which the pulley 540 for the drive belt 5 20 is mounted in a motion-locking manner. The second cone wheel 550 of this transmission is located on a shaft 532 which also carries the 22 23 pulley 531 for the auxiliary drive belt 53. 24 The two cone wheels 55 and 550 are wrapped together by a belt 551, which can be displaced 26 parallel to the shafts 541 and 532 by an adjusting device 630. 27 23

In a manner similar to that described for the two motors 54 and 29 530 (FIG. 2), the speed of the auxiliary drive belt 53 can also be accelerated to the speed of the drive belt 5 after it has been tightened . 33 34 35 36 1 The actuating device 630, possibly also the control device

2 tung 6, stands in a suitable manner along the

3 spinning machine movable maintenance device 64 control

4 moderately connected. This can be done, for example, using towing

5 cables happen that also power the maintenance

6 Ensure device 64. The previously described

7 increase in speed of the auxiliary drive belt 53 can

8 with control from the movable maintenance device 64

9 be.

10 1 A certain basic

12 position of the belt 551 can be determined by which

13 - taking into account a possible difference in diameter between the pulleys 540 and 531 - that

15 Gear ratio between the drives for the

16 main drive belt 5 and the auxiliary drive belt 53

17 is true.

18th

19 The maintenance device 64 carries one according to FIGS. 3 and 11

20 auxiliary drive roller 640, which is driven in a known, not shown 2i manner from the maintenance device 64.

22 This auxiliary drive roller 640 can be used during the piecing phase 3 at the spinning position S to be pieced

2 bobbin 70 are brought to the thread for piecing

25 Return spinning rotor 1 and to pull the thread out of spinning rotor 1 again after it has been attached. So that a constant ratio between rotor speed and 2s thread take-off speed can be maintained here

<_y the drive of the auxiliary drive roller 640 and the actuator

30 device 630 via the maintenance device 64 control

- ,, moderately coupled.

32

33 The spinning speed also applies to the device

34 according to FIG. 3 by one at each spinning station S individually

35 provided switch lever 20 (see Fig. 1 and 2) 35 selected. FIG. 4 shows the switching device 2 shown in FIGS. 1 and 3 with the switching lever 20 in the front view. Such a switch lever 20 is provided individually for each spinning position S. The arm 230 with the main pressure roller 211 is assigned a compression spring 22 which, when the switch lever 20 is released by means of the main pressure roller 211, normally holds the main drive belt 5 in contact with the shaft 10 of the spinning rotor 1.

According to the embodiment shown in FIG. 4, a brake 4 for the spinning element is connected to the changeover lever 20 for control purposes. For this purpose, a brake lever 44 is pivotally mounted on the axis 213 of the main pressure roller 211, on the free end of which a pull rod 8 engages. The brake lever 44 is arranged at an angle to the arm 230 of the switch lever 20. Its free end is in closer proximity to the plane defined by the main drive belt 5 than the arm 230 of the lever 20. This arm 230 has a stop 232 on its side facing the brake lever 44, against which a stop near the free end of the brake lever 44 provided driver 440 can be brought to the plant.

The brake lever 44 has in the vicinity of the axis 213 a brake lining 441 which can be brought into contact with the shaft 10 of the spinning rotor 1, which is accordingly also arranged in the immediate vicinity of the main pressure roller 211. The position of the brake lever 44 with the brake lining 441 divides the brake lever 44 into a shorter lever arm 442, which faces the main pressure roller 211, and a longer lever arm 443, which faces the free end, on which the pull rod 8 engages. 4 shows the device in the spinning position, in which the main drive belt 5 rests on the shaft 10 of the spinning rotor 1. If the spinning rotor 1 is to be stopped, the brake lever 44 is brought to bear against the shaft 10 by means of the pull rod 8 with its brake lining 441 in the direction of the support rollers 11. When the pull rod 8 is moved further, the brake lever 44 acts as a two-armed lever, which is supported on the shaft 10 of the spinning rotor 1 and, with its lever arm 442, lifts the main pressure roller 211 to such an extent that the main drive belt 5 passes through the support disks 50 and 51 (see FIG 8) is lifted off the shaft 10. The switch lever 20 is only pivoted so far that the auxiliary pressure roller 212 does not yet bring the auxiliary drive belt 53 into contact with the shaft 10 of the spinning rotor 1.

If the lower rotor speed is now to be selected for the piecing, the pull rod 8 is moved against the changeover lever 20. The driver 440 0 of the brake lever 44 comes to rest against the stop 232 of the switch lever 20 ^' . This is pivoted so that 2 the main pressure roller 211 releases the main drive belt 5 and the Hil sand return roller 212 presses against the auxiliary drive belt 53. The main drive belt 5 is lifted off the shaft 10 by the 5 support disks 50 and 51, while 5 the auxiliary drive belt 53, which is driven by the stepped roller 34 (FIG. 3), the auxiliary drive motor 530 (FIG. 1) or 3 the conical gear transmission 55, 550 (Fig. 2) with a reduced speed 5 reasonable _Q is exaggerated relative to the main drive belt g, comes to bear against the shaft 10. 1 2 By moving the rod 8 and therefore also of Bremshe- 3 bels 44 in one direction is thus braked, the spinning rotor 1 _4, wherein at the same time both the Hauptantriebsrie- ₅ men 5 and the auxiliary drive belt 53 are lifted from the shaft 10 5, while by moving the pull rod 8 1 and the brake lever 44 in the opposite direction

2 main drive belt 5 stands out from the shaft 10 while

3 the auxiliary drive belt 53 for abutting the shaft 10

₄ arrives.

5

6 As Fig. 4 shows, the arm 230 of the two-armed Umschal.t-

7 lift 20 with the main pressure roller 211 through a pressure

8 of the 22 so acted that the switch lever 20 returns to its g spinning position when it is neither subjected to a pull nor a push through the pull rod 8. In this spinning position, the main pressure roller 211 presses the

1 main drive belt 5 against the shaft 10 of the spinning rotor 1, while the auxiliary pressure roller 212 releases the auxiliary drive belt 53, which by the action of the support

1 disks 50 and 51 (see FIG. 8) are lifted 5 from the shaft 10. By means of this compression spring 22 - or possibly another 7 elastic element - the main drive belt 5 is thus released when the switching device 2 is released to abut against the shaft 10 of the spinning rotor 1 (or, if appropriate, another connection connected to the spinning rotor 1 in a rotationally fixed manner. 2i drive element, e.g. a drive host1).

22

23 In the embodiment shown in Fig. 5 there is the brake

2 4 from a driven intermediate lever 45 and the actual

_j.- loan brake lever 44. The intermediate lever 45 is arranged on the 5 axis 201 of the switch lever 20 and stands with

27 its end facing the auxiliary drive roller 212 with the

28 tie rod 8 engaged. In addition, this end of the

29 intermediate lever 45 a driver 450, which the arm

30 231 of the switching lever 2 on which the shaft 10 is

32 overlaps.

32

33 The end of the intermediate

34 hebeis 45 is designed as a fork 451 and encompasses one

35 pin 444 at the free end of the brake lever 44 mounted on the axis 213 of the main pressure roller 211. The intermediate lever 45 is thus articulated with the end of the on the

2 axis 213 of the main pressure roller 211 pivotally mounted

3 brake levers 44 in connection. This carries - as in Fig. 4

4 - a driver 440, with which it is on the side of the

5 arm 230 of the switching lever 20 can be brought into contact 5, which faces the shaft 10 of the spinning rotor 1

7 is so that the brake lever 44 with its driver 440 the

₈ engages under arm 230 of the switching lever 20.

9 0 The arm 231 of the switch lever 20 is acted upon by a tension spring 220 such that when the switch lever 20 is released, the main pressure roller 211 pushes the main drive belt

23 men 5 moved against the shaft 10 of the spinning rotor 1.

14

25 In this version of the device, the movement

2 devices of the rod 8 in order to obtain certain ₂ 7 functions from those of the Vorrich¬ shown in Fig. 4 t _e tung vice versa. When the pull rod 8 is lifted

19 follower 450 of the intermediate lever 45 of the shift lever 2 Um¬ 20 is lifted from the arm 231 and the brake lever 44 pivoted by the 21 Zwiεchenhebel 45 against the shaft 10 of the spinning rotor 1 _ _P. The spinning rotor 1 is thus stopped. With __ continuation of the movement of the pull rod 8, the is supported

24 brake lever 44 on the shaft 10, which is now a pivot axis for

25 forms the Eremεhebel 44, and lifts the main pressure

26 roll 211 from the main drive belt 5 without the

27 auxiliary pressure roller 212 for contact with the auxiliary drive belt

28 men 53 brings.

29

30 When pulling down the drawbar 8, the stop 450

31 of the intermediate lever 45 entrains the changeover lever 2 32 and presses the auxiliary pressure

33 drive belt 53 on the shaft 10. The main drive belt released simultaneously by 4 the main pressure roller 211

35 men 5 is lifted from the shaft 10 of the spinning rotor 1 by the support disks 50 and 51 3 (see FIG. 8). 2 In the basic position of the drawbar 8, the two-armed

2 switch lever 20 due to the action of the pull

3 spring 220 the spinning position in which the spinning

4 gate 1 receives its drive from the main drive belt 5.

5

6 The control of the pull rod 8 can be carried out with the aid of the in FIG. 6

7 device shown. A spring 80 exercises here

8 direct or indirect constant pulling force on the pulling

9 rod 8, wherein it is held in the position in which the brake pad 440 of the brake lever 44 is lifted from the 1 shaft 10. The feeder 8 is connected to a two-armed lever 81 3 which can be pivoted about an axis 810. The two-armed lever 81 is locked by a control lever 82 which can be pivoted about an axis 820. For this purpose, the control lever 82 has a drive 6 at 821, which engages around a roller 811 of the lever 81. The 7 control lever 82 is arranged in a slot 700 (FIG. 12) of an 8 cover 7 of the spinning station S and can be moved relative to it. 6, the control lever 82 is in alignment with the cover 7. In this position I, the changeover lever 20 assumes its spinning position 2, in which the main pressure roller 211, the main drive belt 5 is in contact with the shaft 10 of the spinning rotor 1 holds. 4 5 If the spinning rotor 1 is to be made accessible for maintenance 6, the rotor housing (not shown) is opened by folding down the cover 7 (FIG. 6). With this 8 cover 7, the control lever 82 is actuated simultaneously 9, which is pivoted in the direction of the arrow 83 into the position II and thereby releases the lever 81. The spring 1 80 thus moves the pull rod 8 in such a way that the 2 brake lever 44 is brought into its braking position and the switchover 3 at 20 into its neutral intermediate position, 4 in which neither the main drive belt 5 nor the auxiliary drive belt 53 in System located on shaft 10. 6 After maintenance, the cover 7 (FIG. 6) of the rotor housing (not shown) is closed again. The control lever 82 is left in the folded position for piecing or is brought into this folded position. The brake lever 44 thus continues to assume a braking position.

Matched to the return of the thread end into the spinning element, the control lever 82 is then pressed in the direction of arrow 84 against the action of a return spring 822 into position III in the cover 7. Here, the main pressure roller 211 is lifted from the main drive belt 5 in the manner described and the auxiliary pressure rollers 212 are pressed against the auxiliary drive belt 53 via the pull rod 81, so that the spinning rotor 1 is now driven by the auxiliary drive belt 53.

The movement of the control lever 82 independently of or together with the cover 7 can be controlled by hand or also from the maintenance device 64. In the usual way, this maintenance device 64 has a control device 641 (FIG. 6), which controls the entire piecing process. This control device 641 is connected to a drive device 642 for an unlocking device 643 for the control lever 82 or the cover 7. The drive device 642 is designed, for example, as a camshaft with a multiplicity of cams, of which one cam also causes the cover 7 and / or the control lever 82 to be returned from the position II to the position I, in which it is flush with the cover 7 closes. This drive device 642 also has a bolt 644 which is pressed against the control lever 82 to switch on the reduced piecing speed and which pivots it out of position I against the action of the return spring 822 into position III. Thus, it is used in the maintenance device 64 1 provided drive device 642 for controlling the urinal

2 shift lever 20 in such a way that the unlocking

3 device 643 the spinning rotor 1 stopped, over the

4 bolts 644 the spinning rotor 1 for piecing with reduced

5 rotor speed driven and in not shown

6 way powered at normal production speed

7 will.

8 g The previously described configuration of the device for control

10 The drive of a spinning element is particularly suitable

11 for control by a maintenance device 64,

12 which can be moved along the spinning machine.

13

14 For manual piecing, the operator needs both

15 de hands to return the thread to the spinning rotor 1

16 and in order to match the

17 to release the supply of fibers into the spinning rotor 1. The

13 The operator, as is the case with an ig embodiment according to FIG. 6 by the maintenance device 64 20, cannot hold the control lever 82 pressed in the direction of arrow 84 during the piecing process.

22

23 In order to ensure that the rotor

24 speed for the piecing process in a simple manner

To be able to control 25, the device 25 shown in FIG. 6 is modified according to FIG. 12. A locking device 85 is assigned to the control lever 82 27, which holds the control lever 82 back in the piecing position III. Thus, the locking device 85 not advertising both the movement _Q 3 supply of the control lever 82 from the production position I 32 (see Fig. 6) in the piecing position III and 32 for the return movement into the production position actuated 2g

33 must, the locking device 85 has one

24 elastically loaded catch 850, which when the

25 control lever 82 evades and when reaching the piecing

36 position III engages behind the control lever 82 again. To release the control lever 82, the catch 850 is assigned a controllable electromagnet 851.

In the embodiment shown, a switching device 852 for the fiber delivery device 72 (see also FIG. 11) is attached to the cover and is actuated by means of a switching button 853. The switching device 852 is connected via a control device 854 to the fiber delivery device 72 mentioned and the electromagnet 851 in terms of control.

For the piecing process, the control lever 82 is brought into the piecing position III, in which it is secured by the latching catch. The spinning rotor 1 is thus driven in the manner described at a low speed. The thread (not shown) is returned to the collecting surface of the spinning rotor 1 in a known manner. Likewise, the fiber feed to the spinning rotor 1 is switched on in a known manner by actuating the switch button 853 at the desired point in time. When the piecing process is complete and the usual thread monitor (and therefore not shown) detects the presence of the usual spinning tension, the switch button 853 is released.

When the switch button 853 is released, the control device 854 briefly excites the electromagnet 851. This releases the control lever 82 so that it returns to its production position I by the action of the return spring 822, in which it is held by another stop, not shown. The spinning rotor 1 is thus driven again at full production speed. 1 If the piecing process has failed, the tax

2 at 82 again in its piecing position III and

3 the piecing process is repeated. 4

5 In practice, possibly due to deposits

6 genes of dirt in the collecting groove of the spinning

7 rotor 1, an unbalance of the spinning rotor 1 is not completely corrected

Avoid 8. To prevent this unbalance from becoming one

9 leads to increased wear of the main pressure roller 211 of the switching lever 20 and its mounting, in the 1 embodiments shown the switching lever 20 is assigned a damping device 9. 1, the damping device 9 is designed as a friction damping, which in the 4 exemplary embodiment shown has the shape of a rubber bushing 90. 5 6 The damping device 9 can have different designs 7. FIG. 7 shows a modification in which an elastic bushing 91 is provided between 3 of a disk 26, which rests on the part 27 of the machine frame that supports the axis 201 of the switch lever 20, and the switch lever 20. At its end facing away from part 27, axis 201 has a thread 200, onto which a nut 92 3 and a lock nut 920 are screwed. A compression spring 93 is clamped between 4 the switch lever 20 and a washer 930 on one side and 5 the two nuts 92 and 920 and a washer 931 5 on the other. Depending on _{7 of} the preload of the compression spring 93 set by the nut 92 and the lock nut 920, the changeover hinge at 20 is pressed more or less strongly against the elastic bushing 0 91, so that the damping effect 2 of the damping device 9 is caused by the preload can be adjusted. FIG. 5 shows a further modification of a damping device 9 for the changeover lever 20. In this embodiment 5, a piston 94 is connected to the changeover lever 20 via a piston rod 940 5, which piston 95 in a cylinder 95 1 chambers 950 and 951 separate. The two chambers 950 and 951 are connected to one another by a throttle line 96, in which, according to the embodiment shown, a throttle valve 960 is installed. The cylinder 95 and the throttle line 96 are filled with a medium which is brought by the piston 94 from one chamber 950 into the other chamber 951 (or vice versa). However, due to the small cross-section of the throttle line 96 and the presetting of the throttle valve 960, the medium cannot pass unhindered from one chamber to the other, as a result of which the desired damping is achieved. 2 As the above description shows, the device for driving at 4 different speeds can be designed in different ways. DA 5 in the invention is approximately examples not only to the shown execution 7 ^'limited. Rather, the different 8 characteristics can be exchanged with one another or with equivalents or can be used in other combinations. So 0 it is of course possible, instead of the shown i supporting rollers 11 and combined axial / radial bearings 13, to also provide two pairs of disks and a standard axial bearing or a standard 3 direct bearing for the spinning rotor 1. 4 5 It is also not necessary to provide two tangential belts (main drive belts 5 and 7 auxiliary drive belts 53) as drives for the spinning rotors 1. Rather, another suitable collective drive and / or auxiliary drive 9 can also be provided here, for example by driving one or more spinning rotors 1 from a main role via a belt 1 assigned to one or more spinning rotors 1, which drives the shaft 10 of the spinning rotor 1 3 wraps more or less strongly. It is also not necessary that the auxiliary drive 57 be accommodated in the drive frame 500 5 of the machine. Alternatively, it is possible to provide this in the middle between several sections of the machine or stationary per section. 2 The switching device 2 does not necessarily have to be a

2 two-armed switch lever 20 may be formed. Instead of

3 ses two-armed switch lever 20 can also be used for both

₄ main pressure roller 211 and the auxiliary pressure roller 212 _c, a separate changeover lever may be provided, whereby only

5 loaned in a suitable manner, η that their movements are coordinated to achieve the effects described Q. This can thereby elec- ₉ tro-pneumatically or electrically or otherwise

10 happen. The same applies to the brake lever, which

₂₂ by a connection independent of the switching device 2

» _P drive device, but tailored to its actuation,

₁₃ can be moved.

14

15 Such a device in which the brake lever 40

16 is stored independently of the switch lever 20, but

17 is still moved in a coordinated manner, will now

18 explained with reference to FIGS. 8 to 10.

19

20 The brake lever 40 is on one side of the shaft 10

21 pivotally mounted and extends on a bearing pin 41

22 over the two support disks 11 and the shaft 10

23 of the spinning rotor 1 to the other side of the

24 shaft 10. Here, the tension

25 ge 8 connected to the free end of the brake lever 40. The

26 bolt 42 protrudes beyond arm 231 of the two-armed switching lever

27 lever 20 on its side facing away from the shaft 10 of the spinning rotor 1, which is designed as a stop surface 233. g The bolt 42 of the brake lever 40 is in turn

30 impact trained to the abutment to this stop

31 surface 233 of the switching lever 20 can be brought.

32

33 As indicated schematically, the control lever 82 is at

34 this embodiment as a two-armed lever

35 det, which carries at its end facing the lever 81 a 3 roller 823, which by a fork 812 of the lever 81st 1 is included. The position of the pull rod 8 is thus

2 inevitably depending on the position of the tax

3 bels 82 controlled.

4

5 In the spinning position in which the control lever 82 is

6 assumes position I (see FIG. 6), take brake lever 40

7 and switch lever 20 in the position shown in FIG. 9.

8 Here, the switch lever 20 is held in contact with the bolt 42 of the brake lever 40 due to the action of the tension spring 220 with its stop surface 233 0. In 1 of this position of the change-over lever 20, the main pressure roller 211 presses the main drive belt 5 against the shaft 3 10 of the spinning rotor 1, while the auxiliary pressure roller 212 4 releases the auxiliary drive belt 53, which is caused by the action of the support rollers 50 and 51 from the shaft 10 is lifted off. 7 g To stop the spinning rotor 1, the control lever 82 9 is moved independently of a movement of the cover 7 (see FIG. 6) or together with it in the direction of the arrow 2 83 (FIG. 10). The pull rod 8 is pulled downward here and brings the brake lever 40 with its brake lining 441 to bear against the shaft 10 of the spinning rotor 24 1. The spinning rotor 1 is stopped. Moreover

25 brings the pull rod 8 during this movement as a bolt

- 42 trained driver of the brake lever 40 to the system 7 to the stop surface 233 of the switch lever 20 and finally takes the switch lever 20 with it. The main push roll

₂₉ le 211 thus releases the main pressure belt 5, so that

-> this through the two support disks 50 and 51 from the shaft

22 10 lifted off and is therefore no longer driven.

32

33 From Figs. 8 to 10 it can be seen that by

3 ₄ Bearing of the brake lever 40 independent of the switchover

35 at 20 the distance of the brake pad 441 from the bearing pin 41 35 can be chosen to be relatively large. The brake pad 441 leads 2 therefore during the braking process in the area of the sheep

2 tes 10 of the spinning rotor 1 an approximately linear braking movement. This ensures that even at

4 Greater wear of the brake pad 441 is moving.

5 direction to the shaft 10 does not change significantly, so that regardless of the degree of wear of the brake pad 441 there is no risk that the brake lever 40 on the shaft 10th

3 can get stuck.

9

20 Is the maintenance work for which the spinning rotor 1 is

22 was set, the piecing is carried out

22 leads. In coordination with the other operations of the

22 piecing the control lever 82 after closing

24 of the cover 7 in the direction of arrow 84 in the position

2 III brought (Fig. 8). The pull rod 8 is thus raised, the bolt 42 engaging the arm 231 of the switch lever 20

₂ 7 releases. With this lifting movement of the pull rod 8 is also

₂₈ the brake lever 40 is pivoted about its axis 41. there

29, the carrier 440 of the environmental _2Q shift lever 20 lies against the stop 232nd This is pivoted so that

₂₁ that the main pressure roller 211 from the main drive belt 5

₂₂ lifted and the auxiliary pressure roller 212 against the auxiliary

₂₃ drive belt 53 is pressed. This will help the

₂₄ drive belt 53 brought to rest on the shaft 10 of the spinning _ _ι - rotor 1, which is thus by this auxiliary drive belt

26 men 53 is driven; the main drive belt 5 released by the main pressure roller 27 le 211 has been lifted off the shaft 10 by the support rollers 50 and 51. 28 29

The brake lever thus serves in the embodiment described with reference to FIGS. 8 to 30 for the optional pivoting 31 of the changeover lever 20 in one or the other pivoting 32 direction, in order to brake the spinning rotor 1 33 in this way or, in deviation from the production speed, with one 34 to drive a specified piecing speed. Here, the spinning rotor 1 can be used with the aid of 36 after the piecing has taken place 11 shows a further modification of an open-end spinning station. In this embodiment, a pair of friction rollers 12 is provided as a spinning element instead of a spinning rotor. The friction rollers 12, of which only one roller can be seen in FIG. 11, each carry a whorl 120, against which either the main drive belt 5 or the auxiliary drive belt 53 bears. For this purpose, each of the two belts 5 and 53 is assigned a fork (not shown). Each of these forks is connected in terms of control to a separate lifting drive, for example an electromagnet 52 or 520, the two electromagnets 52 and 520 being controlled in a coordinated manner by the control device 641 on the maintenance device 64. For example, by dropping the electromagnet 52 via the fork it moves, which is equipped with rollers to reduce the friction between the fork and the belt, the main drive belt 5 can be brought into contact with the whorl 120 while it excites the whorl 120 releases. Conversely, the electromagnet 520 can bring the auxiliary drive belt 53 into contact with the whorl 120 when excited and lift the auxiliary drive belt 53 off the whorl when it falls off. If the electromagnet 52 is excited and the electromagnet 520 has dropped off, the whorl 120 is not driven at all.

The main drive belt 53 can in turn, as described in connection with FIGS. 2 and 3, be reduced in relation to the speed of the main drive belt 5

Speed driven and then up to the speed 1 strap 5 can be done bumpless. The auxiliary drive belt

2 men 53 can also from the maintenance device 64 in

3 Dependence on a piecing program in its transport

₄ direction can be reversed if this is for example for

5 cleaning of the friction rollers 12 is desired. Here-

6 at remains the drive of the friction rollers 12 other

7 spinning positions unaffected, so that these rollers are driven there after 3 as before by the main drive belt 5 at 9 production speed. 11 shows that the friction rollers 12 are fed with the fiber material 71 through a fiber delivery device 72 and a 3 opening roller 73. The fiber delivery device 72 has a delivery roller 720 which sits at one end of a delivery shaft 721. The delivery shaft 721 is connected via a g coupling 75 to a delivery shaft 722 which

2 carries a worm wheel 723. This is in engagement with

28 a screw 740, which in turn rotationally fixed on a drive collecting the .. 56 forming the main drive shaft 74 is angeord- net _ _0th

21

22 Between the delivery roller 720 and the clutch 75 carries the

23 delivery shaft 721 a gear 724, which is connected via a chain 725

24 is in drive connection with a gear 760.

25 The gear 760 sits at the end of an intermediate shaft 76, the

26 via a clutch 750 with another intermediate shaft 76

27 is connected. This carries a worm gear 762 at its free end and is supported by an auxiliary

29 drive shaft 77 (auxiliary drive 57) driven out.

30

31 By controlling the couplings 75 and 750 accordingly

32, the delivery roller 720 can optionally by the main drive

33 shaft 74 or through the auxiliary drive shaft 77 or through

34 neither of these two shafts 74 and 77 are driven.

35 If desired, the delivery roller 720 can also be driven by the auxiliary 3 drive shaft 77 in the opposite direction to the feed direction are rotated to bring the fiber beard out of the area of the opening roller 73. This reversal of the direction of rotation can be initiated by the usual thread monitor (not shown) or by the maintenance device 64.

After piecing, the auxiliary drive shaft 77 can be accelerated synchronously with the spool 70 and / or with the friction rollers 12 to the production speed specified by the main drive shaft 74, whereupon the drive from the auxiliary drive shaft 77 onto that can be actuated by simultaneous actuation of the clutches 75 and 750 Main drive shaft 74 is handed over. It goes without saying that such a control of the delivery roller can also be used in connection with a spinning element designed as a spinning rotor 1 (see FIGS. 1 to 10).

Claims

Patent claims

1. Open-end spinning machine with a large number of spinning stations arranged side by side, the spinning elements of which are driven jointly by a collective drive, characterized by a stationary auxiliary drive (57), each of which supports the spinning element (1, 12, 72) the spinning station (S) can be individually assigned instead of the collective drive (56).

2. Spinning machine according to claim 1, so that the auxiliary drive (57) is arranged in the drive frame (500).

3. Spinning machine according to claim 1 or 2, so that the auxiliary drive (57) is assigned a drive motor (530) which is separate from the collective drive (56).

4. Spinning machine according to claim 1 or 2, characterized ¬ characterized by a ^• drive motor (54) which is directly associated with the collective drive (56) and the auxiliary drive (57) via a transmission gear (3).

5. spinning machine according to claim 4, d a d u r c h g e ¬ k e n n z e i c h n e t that the gear ratio of the translation gear (3) vorzugεweiεe between

95: 100 and 75: 100 is adjustable.

6. spinning machine according to claim 5, d a d u r c h g e k e n n z e i c h n e t that the transmission gear (3) has a step disc (34).

7. Spinning machine according to claim 4 or 5, d a d u r c h g e - k e n n z e i c h n e t that the transmission gear (3) is infinitely adjustable.

8. Spinning machine according to claim 3 or 7, so that the speed of the auxiliary drive (57) can be increased up to the speed of the collective drive (56).

9. Spinning machine according to claim 8, so that the auxiliary drive (57) can be accelerated along the run-up curve of the fiber quantity reaching the spinning element (1, 12) after the release of the fiber delivery device (72).

10. Spinning machine according to one or more of claims 3, 7 and 8, d a d u r c h g e k e n n z e i c h n e t that the auxiliary drive (57) is reversible in its direction of rotation.

11. Spinning machine according to one or more of claims 8 to 10, so that the auxiliary drive (57) can be controlled by a control device (641) arranged on a maintenance device (64) which can be moved along a plurality of spinning positions (S) (64).

12. Spinning machine according to claim 11, dadurchge ¬ indicates that the control device (64) controlling the auxiliary drive (57) on the maintenance device (64) in terms of control with an auxiliary drive device (640) for the device pulling the thread during the piecing process ( 70) is connected.

13. Spinning machine according to one or more of claims 1 to 12, characterized in that the collective drive (56) has a main drive belt (5) for simultaneously driving a plurality of spinning elements (1, 12, 72) and the auxiliary drive (57) an auxiliary drive belt (53) for individually driving a spinning element (1, 12, 72).

14. Spinning machine according to claim 13, so that the auxiliary drive belt (53) is narrower than the main drive belt (5).

15. Spinning machine according to claim 13 or 14, characterized in that at each spinning station (S) an individual switching device (2) is provided for alternately assigning one of the two drives (56, 57) to the spinning unit (1, 12, 72), which by an elastic element (22, 220) is acted on in such a way that the main drive belt (5), when the switchover device (2) is released, for contact with a drive element (10) connected to the spinning element (1, 12, 72) in a rotationally fixed manner , 120) is feasible or durable.

16. Spinning machine according to one or more of claims 13 to 15, characterized in that a two-armed switch lever (20) is seen per spinning station (S), which for alternating installation of the main drive belt (5) or the auxiliary drive belt (53) on Spinning element (1, 12, 72) carries a main pressure roller (211) on one arm (230) and an auxiliary pressure roller (212) on its other arm (231).

17. Spinning machine according to claim 16, dadurchge - indicates that the switching lever (20) is connected in terms of control with a brake (4) for the spinning element (1, 12, 72).

18. Spinning machine according to claim 17, so that the brake (4) is arranged on a brake lever (44) carried by the switch lever (20).

19. Spinning machine according to claim 17 or 18, characterized in that the brake lever (44) has at least one driver (440) and by moving from a neutral spinning position into its end position forming the brake position, the main pressure roller (211) from the main drive belt (5th ) lifts and by its movement into the other end position forming the piecing position causes the auxiliary pressure roller (212) to bear against the auxiliary drive belt (53).

20. Spinning machine according to claim 19, dadurchge - indicates that the brake lever (44) with its one end on the main pressure roller (211) carrying axis (213) of the two-armed switch lever (20) is pivotally mounted and at its free end with an actuating device (8) is connected and carries a braking surface (441) between its two ends and can be moved into its braking position in such a way that the brake lever (44) after reaching its braking position and continuing its movement by resting its braking surface (441) on the spinning wheel ¬ element (1, 12, 72) causes the switching lever (20) to pivot.

21. Spinning machine according to claim 20, dadurchge - indicates that the spinning element (1, 12, 72) is in the immediate vicinity of the main pressure roller (211) and that the distance between the free, the actuating end of the brake lever (44) and the to act on the spinning element (1, 12, 72) bring brake (441) is greater than the distance between the brake (441) and the bearing axis (213).

22. Spinning machine according to one or more of claims 18 to 21, characterized in that the brake lever (44) is assigned an intermediate lever (45) which is pivotally mounted together with the switch lever (20) on a common axis (201) and one of which End engages with the actuating device (8) and engages over the two-armed switch lever (20) on its side facing away from the spinning unit (1, 12, 72) and its other end is articulatedly connected to the brake lever (44), which is the two-armed one Changeover lever (20) engages with the aid of a driver (440) on its side facing the spinning element (1, 12, 72).

23. Spinning machine according to claim 17, characterized by a brake lever (40) which is mounted independently of the two-armed switch lever (2Q) and which has a driver (42, 440) on both sides of the pivot axis (201) of the two-armed switch lever (20). has for selectively pivoting the two-armed switch lever (20) in one or the other pivoting direction.

24. Spinning machine according to one or more of claims 18 to 23, with a Spinnele¬ element designed as a spinning rotor, characterized in that the shaft (10) of the spinning rotor (1) is mounted in a wedge gap formed by support disks (11) and the Brake lever (40, 44) can be moved in the direction of the support disks (11) during its braking movement.

25. Spinning machine according to claim 24, dadurchge ¬ indicates that the shaft (10) of the spinning rotor (1) with respect to the main drive belt (5) and the auxiliary drive belt (53) on the side facing the spinning rotor (1) by a single pair of support disks (11) and on the side facing away from the spinning rotor (1) is supported by a combined axial / radial bearing (13).

26. Spinning machine according to one or more of claims 1 to 25, with a maintenance device which can be moved along a plurality of spinning positions, characterized in that the maintenance device (64) has a drive device (642) which can be controlled by a control program for actuating r- he has switching device (2).

27. Spinning machine according to one or more of claims 1 to 26, characterized in that for the optional assignment of the collective drive (56) or the central auxiliary drive (57) to a spinning element (1, 12, 72) per spinning station (S) a relative to a pivotable control lever (82) which covers the spinning position (S) and can be swung down and is provided.

28. Spinning machine according to claim 27, dadurchge ¬ indicates that the control lever (82) relative to the cover (7) can assume three relative positions (I, II, III), in the production position (I) flush with the cover (7) completes, in its braking position (II) is pivoted away from the spinning position (S) and in its piecing position (III) is pressed into the cover (7).

29. Spinning machine according to claim 28, d a d u r c h g e ¬ k e n n e e c h n e t that the control lever (82) is associated with a locking device (85).

30. Spinning machine according to claim 29, dadurchge ¬ indicates that the locking device (85) is acted upon elastically such that it allows the movement of the control lever (82) into the piecing position (III), but the return to the production position (I) prevents, and that the locking device (85) is associated with a controllable electromagnet (851).

31. Spinning machine according to claim 30, so that the electromagnet (851) is connected in terms of control to a switching device (852) controlling the fiber feed.

32. Spinning machine according to one or more of claims 1 to 31, d a d u r c h g e k e n n z e i c h n e t that the switching device (2) is assigned a damping device (9).

33. Spinning machine according to claim 32, so that the damping device (9) is designed as friction damping.

34. Spinning machine according to claim 33, that the friction damping (9) in the bearing (20) of the switching device (2) is arranged.

35. A method for piecing the spinning positions of an open-end spinning machine, in particular according to one or more of claims 1 to 34, at a piecing rotor speed below the production rotor speed, characterized in that the piecing at a rotor speed close to the production Rotor speed.

36. The method of claim 35, d a d u r c h g e k e n n ¬ z e i c h n e t that the piecing rotor speed is between 5% to 25% below the production speed.