EP0511158A1 - Method and apparatus for transferring cops and bobbin tubes between a ring spinning machine and an associated winding machine - Google Patents

Abstract

A method for operating a composite machine in a spinning installation, consisting of the components: winding machine 31, spinning machine 27 and conveying arrangement 17 for cops 15 and empty tubes 16 from and to the spinning machine 27 and winding machine 31, is designed so that the working speed of a first component is determined continuously and is compared with the working speed of a connected component, and so that the working speed of the connected component is matched to the working speed of the first component in such a way as to result in as continuous an operation of the connected component as possible. <IMAGE>

Description

The invention relates to a method for operating a machine network according to the preamble of patent claim 1 and in particular to a method for removing cops from a ring spinning machine to a winding machine or for supplying empty tubes from the winding machine to the ring spinning machine according to the preamble of patent claim 2.

A combination of ring spinning machine and winding machine, as is used with particular advantage in the method according to the invention, is known from European patent application 0 404 875 (WO 90/03461).

In general, the average operating speed (winding capacity) of the winding machines is adapted to the ring spinning machines. This means that the take-up capacity of copters differs from machine to machine.

The number of spindles on a ring spinning machine can normally be between approx. 600 and 1200 spindles. The cop run time is 0.75 to 24 hours and in most ring spinning machines 3 to 6 hours. For clearing the cops during the spinning process, a reserve of 10 min should be planned in addition to the normal cop run time. Accordingly, the average working speed (clearing capacity) of the conveyor arrangement provided on the ring spinning machine must be able to work in a range as wide as 0.5 to 30 cops / min, which corresponds to a variation in the working speed in a ratio of 1:60.

It should also be noted that after a fault on the winding machine or on the conveyor arrangement of the ring spinning machine it should be possible to increase the average working speed (take-over capacity) of the winding machine so that all cops are cleared by the next doffing process.

In the known combinations of ring spinning machines and winding machines, the removal of the cops or delivery of the empty tubes is accomplished by a start-stop operation of the conveyor arrangement. This means that if the winding machine needs cops, the conveyor arrangement is put into operation until one or more cops in accordance with the winding machine's requirements have been transferred from the conveyor arrangement via the unloading buffer line to the winding machine, whereupon the conveyor arrangement again until the occurrence of the next Kopsbedarf is stopped. This leads to an undesirable jerky operation of the conveyor arrangement. The constant acceleration and stopping of the conveyor arrangement requires a high amount of energy and places an increased load on the mechanical components.

The aim of the present invention is to substantially reduce the energy requirement and the mechanical stress on the conveyor arrangement.

To achieve this object, the features of the characterizing parts of patent claims 1 and in particular of claim 2 are provided.

In this way, the working speeds of the ring spinning machine and the winding machine are successively matched to one another in such a way that the number of stops in the conveyor arrangement can be greatly reduced.

Advantageous developments of the invention are characterized by claims 3 to 13.

It is therefore preferable not to stop the conveyor arrangement when there is no need on the part of the winding machine, but the incremental adaptation of the mean operating speeds of the ring spinning machine and the winding machine ensures that the number of stops of the conveyor arrangement is significantly reduced with increasing operating time. E.g. it is possible to reduce the number of stops in a ring spinning machine with 1200 spindles from approx. 500 to approx. 50 in a conventional method with start-stop operation, i.e. to reduce by a factor of 10. This means a correspondingly reduced energy requirement and a considerably reduced stress on the mechanical components.

According to claim 6, it is preferred that the speed of the conveyor arrangement is successively reduced. Correspondingly, the working speed of the winding machine could also be gradually increased to the working speed of the conveyor arrangement. It is also possible to successively change both the working speed of the conveyor arrangement and of the winding machine in the sense of an approximation.

Due to the measures of claim 7 it is achieved that during normal clearing operation the speed of the conveyor arrangement oscillates with a small stroke around the mean or optimal working speed defined in claim 13.

While there is a stop of the conveyor arrangement when the speed is reduced between the successive speed levels, the incremental increase in the operating speed of the conveyor arrangement takes place without an intermediate stop. Because of the slight increase in speed between the individual stages, the energy requirement for this speed increase remains low, just as the stress on the mechanical components is negligible.

As long as there are no drivers at the transfer points, the conveyor arrangement according to claim 11 should be advanced at a speed significantly higher than the relative maximum speed.

The incremental speed reduction in relatively small steps, as defined in claim 12 according to a preferred embodiment, is particularly advantageous.

In the method according to the invention, the capacity of the winding machine is fundamentally at least roughly adapted to the working capacity of the ring spinning machine in a particular spinning program by, for example, in a spinning program where the ring spinning machine works more slowly, individual stations of the winding machine are switched off or the winding speed of the winding machine is increased a lower level is set. This setting is advantageously carried out according to claim 13.

Although the working speeds of the ring spinning machine and the winding machine are adapted to one another as far as possible even before the start of operation, the conveyor arrangement of the ring spinning machine must contain a considerable spare capacity, which takes into account the maximum clearing capacity ratio of 1:60 that occurs in practice, referred to above. After the winding machine has been roughly adapted to the winding capacity corresponding to the currently selected spinning process, the initially significantly higher operating speed of the conveyor arrangement according to the method of the invention automatically adjusts itself to the fact that the control in normal operation with a minimum of stops the conveyor arrangement gets by.

An increased clearing capacity of the conveyor arrangement is also necessary so that after a fault on the winding machine or on the conveyor arrangement of the ring spinning machine, the transfer of cops to the winding machine or of empty sleeves to the ring spinning machine can be increased so that all cops are cleared until the next doffing operation are what has already been mentioned above.

An advantageous device for carrying out the method according to the invention is characterized by claim 14. Advantageous developments of this device are defined by claims 15 to 20.

• Fig. 1 eine schematische Draufsicht einer erfindungsgemäßen Vorrichtung bestehend aus einer Ringspinnmaschine mit daran angeschlossener Spulmaschine,
• Fig. 2 ein Diagramm, welches den funktionellen Zusammenhang zwischen der Geschwindigkeit v der erfindungsgemäßen Förderanordnung von der Zeit wiedergibt,
• Fig. 3 drei die gleiche Zeitachse (t) aufweisende Diagramme, wobei das oberste Diagramm angibt, zu welchen Zeiten der Doffvorgang und zu welchen Zeiten das spinnen an der Ringspinnmaschine stattfindet, das zweite Diagramm schematisch andeutet, wann an der Kopsübergabestelle bzw. Leerhülsenübergabestelle Kopse bzw. Leerhülsen vorhanden oder nicht vorhanden sind, und das unterste Diagramm schematisch andeutet, mit welcher Geschwindigkeit bzw. in welchem Geschwindigkeitsbereich die Förderanordnung der erfindungsgemäßen Ringspinnmaschine arbeitet, und
• Fig. 4 zwei mit gleicher Zeitachse (t) übereinander angeordnete Diagramme, von denen das obere den Kopsbedarf der Spulmaschine in Abhängigkeit von der Zeit darstellt, während das untere Diagramm die momentane Arbeitsgeschwindigkeit der Förderanordnung in Abhängigkeit von der zeit wiedergibt, wobei die Zeitachsen der beiden Diagramme in senkrechter Projektion jeweils die gleichen Zeiten angeben.

The invention is described below, for example with reference to the drawing; in this shows:

• 1 is a schematic plan view of a device according to the invention consisting of a ring spinning machine with a winding machine connected thereto,
• 2 shows a diagram which shows the functional relationship between the speed v of the conveyor arrangement according to the invention over time,
• 3 three diagrams with the same time axis (t), the uppermost diagram indicating the times at which the doffing process and the times at which the spinning takes place on the ring spinning machine, the second diagram schematically indicates when at the cop transfer point or empty tube transfer point cops or Empty sleeves are present or not, and the bottom diagram schematically indicates at what speed or at what speed Speed range, the conveyor arrangement of the ring spinning machine according to the invention works, and
• Fig. 4 two with the same time axis (t) superimposed diagrams, the upper one of which shows the coping requirement of the winding machine as a function of time, while the lower diagram shows the current operating speed of the conveyor arrangement as a function of time, the time axes of the two Diagrams in vertical projection indicate the same times.

According to FIG. 1, a ring spinning machine 27 has spinning unit groups 12a and 12b running parallel to one another on opposite machine sides, each of which consists of spinning units 11 only indicated schematically. The same possible distance between spinning positions is designated by 24. Further details of the ring spinning machine 27, in particular the machine heads, are not shown because the arrangements are customary and known. For the sake of clarity, the number of spinning stations 11 is reproduced in a greatly reduced manner.

Around the two spinning unit groups 12a, 12b, an endless conveyor 17 is guided in the form of a vertically running steel belt, which is placed around the deflecting rollers 39, 40, 41, 42 with a vertical axis at the two ends of the spinning unit groups 12a, 12b running parallel and in alignment with one another. The deflection roller 40 is driven by a main drive motor 9. There are therefore two long debris extending along a respective spinning unit group 12a or 12b and two short debris of the endless conveyor 17 connecting the two spinning unit groups 12a, 12b at the ends.

On the endless conveyor 17 are aligned with the individual spinning positions 11 extending from the endless conveyor 17 outward drivers 19 attached. Immediately next to and below the endless conveyor 17, a horizontal support rail 22 extends in the region of the spinning station groups 12a, 12b, which is also guided around the left end of the ring spinning machine 27 parallel to the endless conveyor 17 in order to establish a transport connection between the two sides of the ring spinning machine 27. The conveyor 17, the driver 19 and the mounting rail 22 together form a conveyor arrangement.

On the support rail 22 are arranged one behind the other at a distance with the drivers 19 pin slides 18, which consist of a circular disc-shaped sliding body 44 and a sleeve pin 13 arranged vertically thereon, which are preferably made of plastic in one piece. The drivers 19 have mechanical driver fingers 45 engaging behind the pins 13.

On both sides of the machine, doffer 14, indicated by dashed lines, are provided in FIG. 1, which serve to remove cops 15 from the spindles of the spinning stations 11 and instead to place empty tubes 16 on the spindles, which have been brought to the individual spinning stations 11 by means of the endless conveyor 17. After removing the empty sleeves 16 from the pin carriage 18, the cops 15 are placed on them.

The deflecting rollers 41, 42 are connected to one another by a tensioning beam 47 which is movable in the direction of the double arrows in the longitudinal direction of the machine and which is set by a tensioning device 48 which is supported on the machine frame and under a pre-tensioning tensioning the endless conveyor 17.

At the end of the spinning unit groups 12a, 12b facing away from the tensioning beam 47, discharge or loading buffer sections 28, 29 formed by driven conveyor belts 34, 35 are provided in alignment with the sections of the support rails 22 running along the spinning units 11, to which only one section is attached schematically indicated winding machine 26 with guide rails 30 and winding units 31 connects. The number of winding units 31 is at least one order of magnitude smaller than the number of spinning units 11.

The endless conveyor 17 is driven in the direction of the arrows at a variable working speed according to the invention. At the end of the support rail 22 of the spinning station group 12b lying in the conveying direction, there is a cop transfer point 32 behind the doffer 14. There is a deflector 36 which grips the pin slides 18 in the region of the deflection roller 39 and separates them from the drivers 19 guided around the deflection roller 39 , so that they reach the conveyor belt 34 beginning in the region of the deflecting roller 39 and are carried by it in the direction of the winding machine 26, initially only up to a stop 55 provided at the end of the conveyor belt 34.

At the end of the support rail 22 of the spinning station group 12a lying opposite to the conveying direction, an empty tube transfer point 33 is provided, to which the trunnion slide 18 equipped with empty tubes 16 is fed from the winding machine 26 by the conveyor belt 35. In front of the empty sleeve transfer point 33 there is a stop 37 which can be briefly retracted by means of a drive device 50 controlled by a light barrier 49 to release the foremost peg slide 18. The conveyor belts 34, 35 are driven in a controlled manner at times or continuously during a sleeve changing process.

At the front end of the conveyor belt 35, the support rail 22 associated with the spinning station group 12a connects, so that pin carriage 18 released from the holding stop 37 and equipped with empty sleeves 16 is pushed from the conveyor belt 35 onto the stationary support rail 22 and gripped there by the driver finger 45 of a driver 19 can be.

At the beginning and end of each conveyor belt 34, 35, light barriers 51, 52, 53, 54 are provided, which serve to determine the presence or absence of trunnion carriages 18 at the relevant point and accordingly the mode of operation of the conveyor arrangements of the ring spinning machine 27 or To control winding machine 26. A further light barrier, not shown, can be provided above the light barrier 54 in order to determine whether the journal carriage 18 located there is equipped with an empty sleeve 16 or not.

At the front end of the conveyor belt 34 there is provided a further stop stop 55 which can be retracted and extended mechanically and which is temporarily withdrawn when the winding machine 26 requires a corresponding number of cops in order to allow a predetermined number of cops 15 to pass to the winding machine 26.

As indicated in Fig. 1 by dashed lines, the main drive motor 9 of the endless conveyor 17 is driven by a switching control device 10, which contains a frequency converter 8, in the manner described below. The switching control device 10 is also connected to the sensors 49, 51, 52, 53, 54, which are in particular designed as light barriers, and possibly also to the other sensors 5, 6, 7 shown and described below, in order to obtain actual values for the control of the main drive motor 9.

With 56 a guide edge of the support rails 26 is designated, which serves to guide the pin carriage 18 laterally.

The operation of the described combination of a ring spinning machine with a winding machine is as follows:

In the position shown in FIG. 1, in front of each spinning station 11 there is a journal slide 18 equipped with an empty sleeve 16. As soon as the sleeves arranged on the spindles of the spinning stations 11 are fully spooled with yarn, the empty sleeves 16 located on the individual journal carriages 18 are replaced by the Doffer 14 is lifted off the support pin 13, and the cops 15 located on the spindles of the spinning stations are lifted off and exchanged for the empty tubes 16. The cops 15 arrive on the support pins 13 of the associated pin slides 18. For the sake of clarity, the intermediate pins required for exchanging the sleeves are not shown.

As soon as the exchange of cops 15 and empty tubes 16 has taken place, the spinning process on the ring spinning machine 27 is started again, and the endless conveyor 17 is started up in the direction of the arrows at a speed which is determined according to the invention in the manner explained below. whereupon the cops 15 are successively transferred by the deflector 36 onto the conveyor belt 34 of the unloading buffer section 28 until the unloading buffer section 28 is full, whereupon the endless conveyor 17 is stopped until there is a renewed need. At the other end of the conveyor belt 34, the winding machine 30 calls the required number of cops 5 in order to produce the final cross-wound bobbins at the winding stations 31.

From the guide rail 30 of the winding machine 26, the empty-wound empty tubes 16 with the journal slides carrying them 18 placed on the conveyor belt 35 of the loading buffer section 29, wherein they are initially only transported to the stop 37. In this way, as well as on the conveyor belt 34, a series of pin carriages 18 lying directly next to one another and equipped with empty sleeves 16 are created, which represent a reserve for the transfer to the endless conveyor 17.

As soon as a driver 19 with driver finger 45 comes into the position shown in dashed lines in FIG. 1 immediately in front of the deflection roller 40, the light barrier 49 releases the control line 49 'indicated by the dashed line and the drive device 50 clears the way for the foremost journal slide 18 by the holding stop 37 is temporarily withdrawn. Thereupon, the conveyor belt 35 displaces this trunnion carriage into the position 18 'indicated by dashed lines in FIG. 1. Here, the pin carriage 18 is already on the stationary support rail 22. It now waits until the driver finger 45 of the driver 19 grasps it and conveys it along the support rail 22 to the assigned spinning station of the spinning stations 11.

In Fig. 1 the endless conveyor 17 is shown in the fully loaded with empty sleeves 16 state immediately before doffing, while there are still a few cops 15 on the unloading buffer section 28.

The following describes how the instantaneous speed of the endless conveyor 17 is determined according to the invention.

After the number of spinning stations 11 or spindles in a ring spinning machine 27 is known and the bobbin running time (in minutes) has also been determined for a specific spinning program, the working speed with which the onto the endless conveyor 17 can be determined can be determined from these two specifications transferred cops must be moved continuously to have them completely transferred to the winder 26 by the next doffing operation. This working speed corresponds to the quotient of the number of spindles and the cop run time (cops / min).

However, a reserve of at least 10 minutes should be available for the optimum working speed or clearing capacity, so that an amount of 10 minutes is to be deducted from the cop running time when the aforementioned quotient is formed.

However, in order to have a reserve available in the event of intermittent malfunctions on the winding machine or the ring spinning machine, the maximum working speed should be increased by 100% compared to the optimal working speed or clearing capacity.

However, it is also possible to determine the time until doffing at any point in time when the ring spinning machine 27 is working by counting the cops 15 which have already been cleared. From the time until the next doffing process and the number of spindles, the working speed can then be determined, which is necessary for the clearing of the remaining cops. This working speed is equal to the quotient from the cops still to be cleared and the time until the next doffing process (cops / min).

In this case, there should also be a reserve of at least 10 minutes for the optimum working speed, so that the optimum clearing capacity is obtained in this case by the fact that this reserve time of e.g. Is withdrawn for 10 minutes.

In this case, too, the maximum working speed should be greater by a factor of 2.

According to the invention, the maximum and optimal working speed (clearing capacity) is now determined taking into account the entire cop running time and continuously taking into account only the time until the next doffing process. The higher clearing speed (clearing capacity) resulting from the two values is selected according to the invention as the maximum speed relevant for the clearing process, which is referred to as v _{max rel} .

According to FIG. 2, the speed v of the endless conveyor 17 is set to the value v _{max rel} after a doffing process at a feasting time, that is to say that the endless conveyor 17 runs, for example, at the start at a working speed which is twice as high as is required to clear all the cops .

As soon as the first requirement of the winding machine is then met, the endless conveyor 17 according to FIG. 2 stops in the same way as is the case with the known ring spinning machines of this type. There then follows a stop time which lasts until the next request is registered by the winding machine 26. The endless conveyor 17 is then switched on again, but according to the invention at a somewhat reduced operating speed. The rate of decrease in speed is approximately 2% of the respective speed.

After the next stop, the speed is reduced again until finally a minimum working speed v _{min is} reached, which is preferably less than the quotient of the number of spindles and the running time of the cops or the number of cops still present and the time until the next doffing process. After reaching this minimum speed at the latest, the endless conveyor 17 will not be for a long time switched off more because now the requirement of the winding machine is greater than or equal to the supply from the ring spinning machine 27.

For reasons of clarity, the number of stop times is shown in a greatly reduced manner in FIG. 2.

According to the invention is further provided according to Fig. 2 that at the latest after reaching the minimum speed, the working speed increases after a certain uninterrupted time t 1 by an incremental step until either the relative maximum speed v _{max rel is} reached or the need of the winder 26 is met is, so that stops with corresponding incremental speed reduction are inserted again.

In a typical embodiment, the time t 1 is 5 seconds, while the incremental speed increase after the time t 1 should also be about 2% of the respective speed.

1, the main drive motor 9 for the endless conveyor 17 in the sense of the diagram of FIG. 2 is driven in a controlled manner by the switching control device 10, the sensors 51, 52, 53, 54 of the switching control device 10 each reporting whether the winding machine 26 has a need for cops or for the transfer to the ring spinning machine 27 empty tubes 16 are available on the loading buffer line 29.

1, there are no drivers 19 in the areas of the endless conveyor 17 between the deflection rollers 39, 40 on the one hand and 41, 42 on the other hand. During the times when free areas of the endless conveyor 17 move from the drivers 19 at the points 32, 33, the speed of the endless conveyor 17 can be compared to that relative maximum speed according to FIG. 2 can be increased to an even higher maximum speed v _max . However, when the first driver arrives at the cop transfer point 32, the speed is reduced again to v _{max rel} .

The driver-free locations of the endless conveyor 17 can be identified as follows:

With the respectively specified working speed, it is also known at what time intervals a driver 19 comes past the empty tube transfer point 33. If there is no driver 19 during two such time intervals, the speed is increased to v _max .

The overall process is as follows:

According to FIG. 3, the endless conveyor 17 is started at the speed v _max after the doffing. As soon as the first driver 19 comes to the cop transfer point 32, the speed of the endless conveyor 17 is reduced by the switching control device 10 to the speed v _{max rel} . The unloading buffer section 28 is then filled and the speed is further regulated as described above with reference to FIG. 2, as a result of which a stop-start working _cycle takes place between the speeds v = O, v _min and v _{max rel} .

As soon as the first driver 19, freed from its cop 15, arrives at the empty tube transfer point 33 after passing through the route between the deflection rollers 39, 40, an empty tube 16 is fed to it from the loading buffer route 29.

The middle diagram in FIG. 3 illustrates the times during which there are no heads 15 at points 32, 33 or empty sleeves 16 are present. There the speed of the endless conveyor 17 is increased to v _max until a driver 19 appears again in front of the cop transfer point 32 or the empty tube transfer point 33. Then the speed of the endless conveyor 17 is reduced again to v _{max rel} and the work cycle shown in FIG. 2 starts again.

When the doff position (FIG. 1) is reached after clearing the cops 15 at the spinning station group 12a, 12b and completely filling them with empty tubes 16, the endless conveyor 17 stops until the end of the doffing process. The imminent reaching of the doff position can be determined by a pre-sensor 5, the final reaching by a main sensor 6 and the switching control device 10 can be notified to stop the main drive motor 9 in good time.

When the drivers 19 of the endless conveyor 17, each of which are free of the cops 15, arrive at the empty tube transfer point 33, they each take up an empty tube 16 supplied in the manner described above, which has been placed on a journal carriage 18 by the winding machine 26.

Due to the distance of the cop transfer point 32 from the empty tube transfer point 33, there is a phase shift between the delivery of a cop 15 from a specific driver 19 and the loading with an empty tube 16 at the empty tube transfer point 33, which must be taken into account in the above-described mode of operation by the maximum speed v _{max is} only started if there is no driver 19 at the cop transfer point 32 or at the empty tube transfer point 33.

The following is a concrete work cycle 4 explains the device according to the invention:

In the upper diagram of FIG. 4, the cop requirement of the winding machine 26 existing at a certain point in time is indicated by the tip of an arrow. It is assumed that at a time 0, the winder needs 30 cops. In this case, the operating speed of the conveyor arrangement is set by the switching control device 10 to a speed v _{max rel} of 30 cops / min, for example. After a minute, 30 cops were then delivered to the unloading buffer line 28 or the winding machine 26, whereupon the endless conveyor 17 stops, until a time of 1.5 minutes, again 20 cops are requested from the winding machine 26. At the same time, the switching control device 10 according to FIG. 1 rotates the main drive motor 9 again, but now at a somewhat reduced speed of, for example, 28 cops / min. A time of about 0.7 min is now required to deliver 20 cops, after which the endless conveyor 17 is stopped again.

At the time of 3 minutes, the winder 26 may request another 10 cops, followed by another incremental. reduced speed of 26 cops / min, the endless conveyor 17 is switched on again, this time for a period of about 0.4 sec.

At the time of 3.75 min, 30 cops may again be requested, whereupon the endless conveyor 17 starts moving again and initially works at a working speed of 24 cops / min for a period of 1 min. On the basis of a corresponding setting of the switching control device 10, the speed at the time 4.75 min is then increased by 2 cops / min, whereupon the endless conveyor 17 continues to run for 0.23 min until the requested 30 cops are delivered have been.

This working cycle then continues until the working speed of the endless conveyor 17 is reduced to 14 cops / min at a time of 10.25 minutes. Since 5 cops are requested by the winding machine at this moment, the speed below the average or optimum working speed of 15 cops / min is maintained for a time of 0.35 min.

At the time of 11 min, 8 cops are then requested, which leads to a further reduction in the working speed to 12 cops / min, which is then maintained for 0.66 min in order to deliver the requested 8 cops.

At the time of 12.25 minutes, 25 cops are requested by the winding machine 26, which initially leads to the endless conveyor 17 being switched on to a further reduced speed of 10 cops / min. After 1 min, 10 cops are then delivered and the speed is increased according to the invention by 2 cops / min to 12 cops / min. After another minute, this leads to the delivery of a total of 22 cops. Then the speed is increased again to 14 cops / min, so that the required number of 25 cops is delivered after a total of 2.21 min.

Depending on how many cops are subsequently requested, the speed curve of the conveyor arrangement continues to rise or fall, with further oscillation around the average of 15 cops / min taking place and the switch-on times between two stops becoming longer and longer.

As can be seen from the above, the time t 1 of the embodiment according to FIG. 2 in the embodiment according to FIG. 4 has been chosen equal to 1 min.

Due to the minimization of the stop processes achieved in the device according to the invention, the service life of the conveyor arrangement is increased considerably.

The arrangement of the sensors 51 and 54 in FIG. 1 is of particular importance for the practical implementation of the invention, because in this way the presence of a free space in the unloading buffer zone 28 or an empty sleeve 16 at the end of the loading buffer zone 29 can be determined, which is proper operation is of particular importance.

It is also useful if the following sensors are also provided:

A sensor 7 determines whether a cop 15 is located at the cop transfer point 32 and is ready for unloading. This is reported to the shift control device 10. Correspondingly, the sensor 49 already mentioned detects the presence of a driver 19 directly in front of the empty sleeve transfer point 33. The sensor 49 transmits an empty sleeve release signal to the drive device 50 either directly or via the switching control device 10.

The main sensor 6 already mentioned detects the doff position of the first driver 19 on the spinning unit group 12b, so that the endless conveyor 17 can be stopped at a suitable point. Reaching this position should be announced by the aforementioned sensor 5 of the switching control device 10, which is arranged somewhat further in front.

Furthermore, a sensor (not shown) for an intermediate position could be arranged between the main sensor 6 for the doff position and the sensor 7 for determining whether a cop 15 is ready for unloading.

Finally, it is expedient if sensors are still present on the conveyor belts 34, 35 or their drives, which determine whether the conveyor belt 34, 35 is driven or not.

In Fig. 1, the distance between the doff position of the foremost driver 19 and the transfer point 32 is shown relatively small; in practice it is considerably larger, so that the distance between the sensors 6, 7 is also larger than that shown in FIG. 1.

For the device according to the invention it is important to choose a motor whose speed can be regulated.

DC motors are suitable for this purpose, which have a high accuracy even in the lower speed range. Frequency-controlled asynchronous motors can also be used, which operate with sufficient accuracy up to a speed ratio of approx. 1:10. Asynchronous motors with multiple windings can also be used.

Should the cops be removed as continuously as possible. a frequency-controlled asynchronous motor must be selected. The regulation takes place either via a digital / analog converter in the switching control device 10 or with outputs as digital information.

A frequency-controlled asynchronous motor should also be selected for mechanical reasons. The frequency converter 8 in the switching control device 10 is controlled via a digital / analog converter.

The gear, not shown, between the main drive motor 9 and the deflection roller 40 according to FIG. 1 must be designed in this way be that the highest speed of the endless conveyor 17 is approximately 40 mm / sec and the lowest belt speed is approximately 4 mm / sec, which corresponds to a frequency range from 100 to 10 Hz.

1, the main drive motor 9 is controlled by a frequency converter 8 provided in the switching control device 10. The frequency converter 8 receives the speed specification from a computer present in the switching control device 10 or connected to it. In order for the control to become independent of the engine and transmission, the speed should be continuously adjusted. The delivered cops per unit of time serve as the basis.

The speed specification for the frequency converter 8 can be implemented, for example, in the form of a voltage of 0 to 10 V. The switching control device 10 or the computer connected to it can determine which voltage corresponds to which speed in the following manner:

A voltage is given to the frequency converter 8. The number of cops 15 delivered is then determined over a certain time without stopping the endless conveyor 17. The conversion factor for the voltage to be specified is then determined from this.

It is now assumed that in a ring spinning machine with 1200 spindles, the cop run time is 120 minutes. The frequency converter 8 may be controllable with an input voltage of 0 to 10 volts at frequencies between 0 and 100 Hz. The main drive motor 9 has a speed of 5.6 rpm at 50 Hz. A voltage of 4 volts is then specified, which corresponds to a frequency of 40 Hz.

At the voltage of 4 volts, the cops passing the cop transfer point 32 in 30 seconds are counted, and it is assumed that 15 cops pass in 30 seconds. From this it can be calculated that the voltage of 4 volts corresponds to a working speed of 30 cops / min.

The speed v _{max rel} can then be selected, for example, to be 1200 x 1.5 / (120-10) = 16.4 ≈ 17 cops / min. This speed can then be achieved by setting the voltage of 4 x 17/30 = 2.3 volts on the frequency converter 8.

In such an embodiment, the speed v _min can then be realized by a voltage of 1 V, the speed v _{max rel} by a voltage of _2.3 V and the speed v _max by a voltage of 8 V at the input of the frequency converter 8.

In principle, it is also possible to continuously adapt the working speed of the winding machine 26 to the bobbin output of the ring spinning machine 27, although it is important to keep the thread tension constant when winding from the bobbins to cross-wound bobbins. The thread tension in the thread to be wound would decrease, for example, when the speed was reduced from 1400 m / min to 1200 m / min if no change was made to the thread brake in the winding station. According to the invention, the thread tension must be changed by suitable intervention in the thread brake with the change in the operating speed of the winding machine. If the winding speed is reduced, the thread brake between the spinning bobbin and the package should be adjusted more strongly, while conversely, if the winding speed is increased, a weaker setting of the thread brake is necessary.

For the thread brakes in the winding machine, actuators according to the invention are provided which are either controlled as a function of the winding speed or have an automatic control which regulates the thread tension to a constant value independently of the winding speed. The positioning of the pin carriage 44 for the impending cop change requires a high degree of accuracy, so that disruptions when removing and fitting the sleeves or copings are avoided. To a certain extent, this positioning process represents the completion of a complete cop / sleeve exchange with the winding machine, and therefore occurs only once for each doffing process. The accuracy of the stopping point required for this is much higher than with the intermediate stops that arise when the cop is handed over and which are dealt with in detail in the description.

The required positioning accuracy can practically only be achieved by moving to the final position at a reduced speed. This requires at least a second drive speed of the motor, which in turn can advantageously be realized with a frequency converter. The drive with converter therefore has a second functionally important meaning: it allows stopping at a creep speed that is practically as low as desired and thus a highly precise stopping point.

Claims (21)

Method for operating a machine assembly in a spinning plant, in particular consisting of the components winding machine (26), spinning machines (27), a conveyor arrangement (17, 19, 22) for cops (15) and empty tubes (16) from or to the spinning machine (27 ) and winding machine (26),
characterized,
that the working speed of a first component is continuously determined and compared with the working speed of a connected component, and that the working speed of the connected component is adapted to the working speed of the first component in such a way that the connected component is operated as continuously as possible. Method for the removal of cops (15) which can be displaced along one side of a ring spinning machine (27) by a conveyor arrangement (17, 19, 22) which is arranged at a distance from the spinning stations (11) and which is conveyed by a doffer (14) of each a spinning station (11) of the ring spinning machine (27) has been transferred to the conveyor arrangement (17, 19, 22) arranged along the relevant side of the ring spinning machine (27), to a winding machine (26) adjoining the ring spinning machine (27), preferably via an unloading device - Buffer section (28), at the beginning of which there is a cop transfer point (32), and for feeding empty tubes (16) that can be transferred through the doffer (14) to a spinning position (11) from the winding machine (26) to one side of the ring spinning machine (27) by means of the conveyor arrangement (17, 19, 22) preferably via a loading buffer section (29), at the end of which there is an empty tube transfer point (33), the cops (15) and empty tubes (16) conveyor arrangement (17, 19, 22) as a function of the need for the cops (15) delivered by the ring spinning machine (27) with a winding machine (26) that processes the work speed and provides empty cores (16) to copes (15) and the supply of empty cores (16 ) is temporarily stopped by the winding machine (26) so that cops (15) only reach the cop transfer point (32) when the winding machine (26) or the unloading buffer line (28) reports a demand, and thus the drivers ( 19) only reach the empty tube transfer point (33) if the winding machine (26) or the loading buffer section (29) provides an empty tube (16), in particular according to claim 1,
characterized,
that the working speed of the conveyor arrangement (17, 19, 22) and / or the winding machine (26) is variable controlled and the variable working speed (s) is changed continuously or preferably in small steps in the direction of a mutual approximation of the two working speeds or . will. Method according to claim 2,
characterized,
that the preferably incremental change in the working speed (s) in the direction of mutual approximation of the two working speeds is carried out each time the conveyor arrangement (17, 19, 22) is stopped. Method according to claim 2 or 3,
characterized,
that at the beginning of the operation the working speed of the conveyor arrangement (17, 19, 22) is made greater than that of the winding machine (26) and then the incremental steps are used to adapt the two working speeds he follows. Method according to one of the preceding claims,
characterized,
that after the two working speeds have been largely adapted, the working speed of the conveyor arrangement (17, 19, 22) and the winding machine (26) relative to one another is so small that a stroke between a value where one is somewhat larger than the other, and vice versa, fluctuates that the conveyor arrangement (17, 19, 22) must be stopped as rarely as possible. Method according to one of the preceding claims,
characterized,
that the conveyor arrangement (17, 19, 22) starts to work at a significantly higher working speed than the winding machine (26) and after each stop of the conveyor arrangement (17, 19, 22) the renewed operation is carried out at a somewhat reduced speed, so that after a certain number of stops, the operating speed of the conveyor arrangement (17, 19, 22) is adapted to the operating speed of the winding machine (26) as far as possible in view of the fluctuating demand of the winding machine (26). Method according to claim 6,
characterized,
that the operating speed of the conveyor arrangement (17, 19, 22) is reduced until it is at least an incremental step below the average operating speed of the winding machine (26) and that subsequently an incremental increase in the operating speed of the conveyor arrangement (17, 19, 22 ) he follows. Method according to claim 6 or 7,
characterized,
that if the conveyor arrangement (17, 19, 22) runs without a stop for a predetermined period of time, which is preferably 1 to 10 sec, in particular about 5 sec, because the winding machine (26) has a corresponding need for cops (15) or correspondingly many empty tubes (16) are available, the speed is increased by a small amount in each case. Method according to one of the preceding claims,
characterized,
that the working speed of the conveyor arrangement (17, 19, 22) between a relative maximum speed (V _{rel max} ), which is the quotient of the number of spindles or the number of cops still to be cleared (15) and cop run time or time to the next doffing process multiplied by one Factor which is greater than 1 and in particular 1.5 to 2, and a minimum speed (V _min ), which is equal to and preferably slightly less than the quotient of the number of spindles or the number of cops (15) to be cleared and the copter running time or Time until the next doffing process can be changed. Method according to claim 9,
characterized,
that the minimum speed (V _min ) by a factor of 0.5 to 0.9, in particular 0.6 to 0.8 and preferably 0.7 less than the quotient of the number of spindles or the number of heads still to be cleared and the head time or time to to the next doffing process. Method according to one of the preceding claims,
characterized,
that the working speed for as long as there are vacancies of the conveyor arrangement (17, 19, 22) past the transfer points (32, 33), is brought to a significantly higher value (V _max ) than the relative maximum speed (V _{rel max} ), which is preferably a factor of 2 to 4, in particular about 3, greater than the relative maximum Speed (v _{rel max} ) is. Method according to one of the preceding claims,
characterized,
that the incremental speed reduction and / or increase takes place in steps of 1 to 5%, in particular 1 to 3% and preferably about 2% of the speed before the stop, and in each case only until the minimum speed (V _min ) or relative maximum speed (V _{rel max} ). Method according to one of the preceding claims,
characterized,
that the quotient of the number of spindles and the copter running time reduced by a small fraction of the bobbin running time, in particular 5 to 15 min, preferably about 10 min, and the average working speed of the winding machine (26th) is defined as the average or optimal working speed of the conveyor arrangement (17, 19, 22) ) is at least approximately set to this value. Device for carrying out the method according to one of the preceding claims, with a ring spinning machine (27), around which a conveyor arrangement (17, 19, 22) having a driver (19) is provided, and one optionally via an unloading buffer section (28) and a Loading buffer section (29) connected winding machine (26),
featured
by a the main drive motor (9) of the conveyor arrangement (17, 19, 22) triggering switching control device (10) which temporarily stops the main drive motor (9) in accordance with the head saturation of the winding machine (26) or in accordance with a lack of empty tubes (16) provided by the winding machine (26) , wherein the main drive motor (9) is initially driven at such a high speed after doffing that the operating speed of the conveyor arrangement (17, 19, 22) is significantly higher than that of the winding machine (26) and each time the main drive motor (9 ) after a stop, the speed is reduced by a small amount, and the speed of the main drive motor (9) increases by a small step, provided the main drive motor (9) has been running continuously for a predetermined period of time since the last stop. Device according to claim 16,
characterized,
that the main drive motor (9) has a frequency-dependent speed and is controlled by a frequency converter (8) provided in the switching control device (10), at which, depending on the required speed of the main drive motor (9), different voltages of, for example, 0 to 10 V can be created. Device according to claim 14 or 15,
characterized,
that the storage capacity of the discharge buffer section (28) and loading buffer section (29) is designed for more than 10, in particular more than 20 and preferably 25 to 30 cops (15) or empty tubes (16). Device according to one of claims 14 to 16,
characterized,
that the storage capacity of load buffer (28) and discharge buffer (29) is designed for less than 50 cops (15) or empty tubes (16). Device according to one of claims 14 to 17,
characterized,
that the cops (15) are arranged on trunnion carriages (18) which, by means of the conveyor arrangement (17, 19, 22) from the ring spinning machine (27) to the unloading buffer section (28), from this to the winding machine (26) and after replacing the Copes (15) are conveyed through empty sleeves (16) to the loading buffer section (29) and from there again to the conveyor arrangement (17, 19, 22). Device according to one of claims 14 to 18,
characterized,
that the conveyor arrangement (17, 19, 22) consists of a flexible, preferably endless conveyor (17), in particular a vertical steel belt, guided around the ring spinning machine, carriers (19) arranged thereon and a support rail (22) arranged along the conveyor (17). Device according to one of claims 14 to 19,
characterized,
that the coping requirement of the winding machine (26) or the presence of empty tubes (16) for supplying the conveyor arrangement (17, 19, 22) is determined by sensors (51, 52, 53, 54) that operate in particular photoelectrically and sent to the switching control device ( 10) is reported. Device according to one of claims 14 to 20, characterized in that an arbitrary position of the conveyor arrangement (17, 19, 22) is approached with reduced working speed, the motor being operable with at least a second reduced working speed, and in that the motor is operated by one Frequency converter is fed with a variably adjustable frequency.

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