Patent Application
20160355954
The present invention relates to a method for operating a spinning machine with a multiple number of work stations arranged next to each other, whereas the work stations, as work elements, feature at least one spinning unit for producing the thread, one winding device for winding the thread on a coil, and handling elements of their own work station for spinning back in the thread. With the method, if production is interrupted, a thread end on the coil side is provided in a defined receiving position at the work station. For spinning back in a thread (F), the thread end on the coil side is cut to length by work elements of the work station, in particular the handling elements of their own work station, received from the receiving position, prepared for spinning back in and spun in. Furthermore, the invention relates to a spinning machine with a multiple number of work stations arranged next to each other in a longitudinal direction of the spinning machine, which, as work elements, feature at least one spinning unit for producing a thread, one winding device for winding the thread on a coil, and multiple handling elements of their own work station for spinning back in the thread. By means of the work elements, in particular the handling elements of their own work station, a thread end on the coil side can be received, cut to length, prepared for spinning back in and spun in.
For conducting a spinning-in process after an interruption in the spinning process, various methods and devices are known in the state of the art. Thus, with many spinning machines, it is customary that they are equipped with maintenance devices, movable along the work stations, which carry out all maintenance operations on the spinning units, such as the repair of thread breakages, coil changing, rotor cleaning, spinning-in on the empty tube and the like. For this purpose, the maintenance devices feature a highly complex structure with a variety of different handling elements. Such a spinning machine with a movable maintenance device is described, for example, in DE 198 27 605 A1. However, in the case of multiple spinning units that require maintenance at the same time, considerable delays in the maintenance device may arise. The problem of waiting times is exacerbated by today's increasing trend of spinning machines with more and more spinning units.
In order to reduce the waiting times on a movable maintenance device, it has also been known to provide multiple maintenance devices on each side of a spinning machine, DE 101 37 081 A1 describes such a spinning machine. For such machines with multiple maintenance devices, laborious processes for controlling the travel movement of the maintenance devices and the assignment of the individual work stations to the various maintenance devices are required. Nevertheless, when there are multiple spinning units that require maintenance at the same time, waiting times at the maintenance device and thus production losses arise, which reduces the efficiency of the machine.
Therefore, EP 1 283 288 B1 proposes a different approach for maintaining the work stations, with which all handling elements for spinning back in a thread, and possibly additional maintenance elements, are arranged directly at each work station. For this purpose, the work stations of the spinning machine feature defined controllable individual drives, in order to, in a suitable manner, drive the work elements of the spinning unit according to the requirements, both during spinning back in and upon regular spinning operations. Thus, after the spinning process is interrupted, each work station is able to independently spin the thread back in. In doing so, the problem of waiting times and the associated loss of production can be avoided. However, such a machine equipped with individual station automation is relatively expensive. In addition, due to the variety of the components to be arranged for each work station, the construction cost is high.
In order to avoid a time-consuming seeking out of a thread end accumulated at the coil and simplify the spinning-in process, it was further proposed by DE 10 2011 053 811 A1 to, in the event of a foreseeable interruption of the spinning process, shut down the work elements of the individual work stations in a controlled manner. Thereby, the conveying speeds of the individual work elements of the spinning machine is reduced to a standstill in a controlled manner, such that a controlled thread breakage arises. Thereby, the thread end does not accumulate on the coil; rather, it remains in a defined placing position in the thread path. From there, it can be received directly through handling elements of a movable maintenance device or through handling elements of their own work station and fed to the spinning-in process.
The task of the present invention is to propose a method and spinning machine, by means of which, even in the event of unforeseen interruptions in the spinning process, the thread end can be rapidly supplied to the spinning-in process.
The task is solved with the characteristics of the independent claims.
With one method for operating a spinning machine with a multiple number of work stations arranged next to each other arranged in a longitudinal direction of the spinning machine, the work stations, as work elements, feature at least one spinning unit with one spinning device for producing the thread, one winding device for winding the thread on a coil, handling elements of their own work station for spinning back in the thread. In the event that the spinning process is interrupted, a thread end on the coil side is provided in a defined receiving position at the work station. For spinning back in a thread, the thread end on the coil side is cut to length by work elements of the work station, in particular the handling elements of their own work station, received from the receiving position, prepared for spinning back in and spun in.
In the event of an accumulation of the thread end on the coil, it is now provided that a thread end accumulated on the coil is sought out by means of a thread seeking device on the surface of the coil movable in the area of multiple work stations of the spinning machine, and the thread end is subsequently moved into the receiving position at the work station. In the receiving position, the thread end is finally received by a work element of the work station, in particular a handling element of its own work station, and is fed to the setting process.
A spinning machine features a multiple number of work stations arranged next to each other in a longitudinal direction of the spinning machine. Each of the work stations includes, as a work element, at least one spinning unit with one spinning device for producing a thread, one winding device for winding the thread on a coil, and multiple handling elements of their own work station for spinning back in the thread. By means of the work elements, in particular the handling elements of their own work station, a thread end on the coil side is received from a defined receiving position, cut to length, prepared for spinning back in and spun in.
The spinning machine features at least one thread seeking device movable in the area of multiple work stations of the spinning machine, which features a suction nozzle subjected to negative pressure for seeking out a thread end accumulated on the coil. Furthermore, a transfer element is provided for moving the thread end from the suction nozzle to the receiving position at the work station, from which the thread end is receivable by a work element, in particular a handling element of its own work station.
With the described method or the described spinning machine, it is possible that work stations are to be equipped to be largely self-sufficient, such that, in most cases, they are able to carry out the spinning-in process, independently and without waiting times. Since, when the spinning process is interrupted, the thread end is always provided in the defined receiving position, from which it can be acquired directly by work elements of the work station, a thread seeking device of its own work station is unnecessary. This results in a significant cost advantage compared to a complete individual station automation along with a simplified design of the individual work stations, since a space-intensive thread seeking device need not be accommodated therein. Nevertheless, in the case of a thread end accumulated on the coil, it is possible that it is rapidly sought out by means of the movable thread seeking device deliverable to multiple work stations and fed for spinning back in. Since the thread seeking device movable back and forth between multiple work stations is reduced to only one or two functions, namely thread seeking and (if applicable) the transfer to the spinning unit, considerable cost advantages compared to a traditional maintenance device and complete individual station automation arise. In addition, even if a thread breakage must be repaired at multiple work stations at the same time, the waiting times for the thread seeking device are considerably reduced, since it only needs to seek out the thread and transfer it to the spinning unit. Thus, the next work station can be operated significantly more rapidly.
According to a particularly advantageous design of the method, the thread end is moved by means of a transfer element of the thread seeking device into the receiving position at the work station. With the spinning machine, at least one transfer element is accordingly arranged on the thread seeking device. In this case, the thread seeking device, as a work element, includes only one suction nozzle, one transfer element and possibly even one thread cutting device. The transfer element may be designed, for example, as a swivel arm, movable hooks, a linearly movable or crank-guided feeder arm or as a pneumatic transfer element. Thus, the thread end can be transferred by the thread seeking device directly to the work station or the work elements of the work station. In principle, however, it is also conceivable to arrange a transfer element at the work station, which then acquires the thread end from the suction nozzle and transfers it to the receiving position.
According to an advantageous embodiment of the invention, the receiving position, from which the thread end is received by a work element, in particular a handling element of its own work station, is located in the thread path between an output of the spinning unit and the winding device, in particular between the output of the spinning unit and a draw-off device of the spinning unit. This area of the work station is easily accessible, such that the thread end can be easily transferred by the thread seeking device or the transfer element into this receiving position.
In order to, in the event of a predictable interruption in the spinning process, provide the thread end on the coil side in the receiving position, it is also advantageous if the work station is shut down in a controlled manner or can be shut down in a controlled manner. For this purpose, the work elements of the work station can be slowed down to a standstill in a manner that is controlled and coordinated with each other, such that the thread end ultimately remains in the defined receiving position and does not accumulate on the coil. In doing so, possible waiting times on the thread seeking device are shortened even further, since it is only necessary in the event of unplanned interruptions in the spinning process, upon which the thread end accumulates on the coil.
It is advantageous if, upon moving into the receiving position, the thread seeking device moves the thread end into the effective area of a pneumatic work element, in particular a pneumatic handling element, of the work station. Such a pneumatic handling element is usually provided at the work stations in any event, in order to fix the thread end upon the spinning-in process or to form a thread reserve. However, an additional pneumatic handling element for acquiring the thread end by the thread seeking device can be provided. It is also possible that the thread end is directly received by a pneumatic work element, for example, the spinning device. In the case of a rotor spinning machine, the thread end can be received, for example through the draw-off nozzle of the rotor spinning device or, in the case of an air spinning machine, through the air spinning nozzle. In any case, the thread end can thus be very quickly transferred through the thread seeking device to the work station, such that waiting times can be further reduced.
It is also advantageous if, upon moving into the receiving position, the thread seeking device inserts the thread end at the same time into the draw-off device of the work station and/or into a thread guide of the winding device and/or into a yarn monitoring device. Thus, the thread end is moved directly by the thread seeking device into a position in the thread path in which it would be located even after a controlled shutdown of the work station. Thus, additional handling facilities at the work station are not necessary. However, in principle, it is also conceivable that, in the receiving position, the thread end is transferred through the thread seeking device solely to a pneumatic handling element, and from there is inserted by additional handling elements of their own work station into the draw-off device and/or into the thread guide and/or into the yarn monitoring device.
With a particularly advantageous embodiment of the spinning machine, the thread seeking device is movable in a longitudinal direction of the spinning machine along multiple work stations arranged next to each other. Thereby, it is in turn advantageous if the thread seeking device is movable by its own travel drive.
However, it is also conceivable to arrange a drive for the thread seeking device on the spinning machine and to connect the thread seeking device to the drive by means of a coupling element, for example a belt drive. Such a movable thread seeking device can be designed in a particularly space-saving manner, such that the arrangement of the work elements of the work station is thereby structurally more simple.
If the spinning machine is provided as a double-sided spinning machine, such a thread seeking device movable in a longitudinal direction of the spinning machine can be designed in a simple and space-saving manner, if this is centrally movable between two longitudinal sides of the spinning machine. The thread seeking device may thereby include, for each of the two longitudinal sides, separate work elements, thus one suction nozzle each and, if applicable, one transfer element each. Alternatively, for both longitudinal sides of the spinning machine, a common suction nozzle can be provided, which can be delivered to the two longitudinal sides or their work stations in exchange. For this purpose, the common suction nozzle and, if applicable, a common transfer element can be arranged on a movable frame in a manner that is, for example, able to be swiveled or folded on both longitudinal sides.
According to an additional advantageous form, the thread seeking device is arranged between at least two work stations of the spinning machine in a manner that can be moved back and forth on the spinning machine. For example, a thread seeking device may be arranged between two work stations that are next to each other in a longitudinal direction, and can be swiveled back and forth between these. In addition, the thread seeking device may also be foldable and/or (if applicable) telescopic in such a manner that, for example, four work stations located next to each other can be operated.
According to an advantageous design of the spinning machine, the handling elements of their own work station further comprise at least one thread separating unit for cutting the thread end to length, one thread preparing unit for preparing the pre-cut thread end and one feedback unit for returning the prepared thread end to the spinning unit and/or at a connection point located outside of the spinning unit. Thereby, the feedback unit may be both designed by an additional device, such as a pair of auxiliary rollers, or formed by the regular draw-off device.
Additional advantages of the invention are described on the basis of the following presented embodiments. The following is shown:
Furthermore, a series of handling elements 10, 16, 17, 18 is provided at the work station 2, by means of which, after an interruption in the spinning process, a thread end 6 on the coil side can be spun back in. For this purpose, the thread end 6 is cut to length by a thread separating unit 16, prepared for spinning back in by a thread preparing unit 17 and returned through a feedback unit 18 into the spinning unit, or through the spinning unit 3 through a connection point 19 outside of the spinning unit 3. In the present case, the feedback unit 18 is formed by the draw-off device 9 of the work station, which is driven to return the thread end 6 counter to the regular draw-off direction. However, the feedback unit 18 may be designed as a separate unit, for example as a pair of auxiliary rollers.
In the present case, a pneumatic handling element 10 is arranged at the work station 2 to temporarily fix the thread end 6. However, this is not absolutely necessary; depending on the arrangement of the individual components and the handling elements 16, 17, 18 at the work station 2, it is also possible to fix the thread end 6 by means of the draw-off device 9. Furthermore, a pneumatic handling element 10 for fixing the thread end 6 or for forming a thread reserve upon spinning back in can also be provided in another place within the thread path at the work station 2, or a multiple number of pneumatic handling elements 10 may be present. Finally, by way of deviation from the illustration shown, it is also possible that handling elements 10, 16, 17, 18 are arranged at each work station 2; rather, such handling elements of their own work station 10, 16, 17, 18 are provided, for example, for two work stations 2 together.
The present illustration now shows a situation at the work station 2 after a targeted disruption of the spinning process. Such a controlled shutdown may occur at any predictable spin stop, for example, to remove a yarn defect, to change the coil or to switch off the work station 2 or the spinning machine. For this purpose, the conveying speeds of the individual work elements 27, 9, 4 of the work station 2, here at least the delivery rollers 27, the draw-off device 9 and the winding device 4 are reduced to a standstill in a manner that is gradual and coordinated with each other. For this purpose, the drives of the individual work elements 27, 9, 4 are equipped with individually controllable drive units (not shown), which are accordingly controllable by a control device (not shown) of the work station 2 or the spinning machine 1. Thereby, the thread end 6 does not accumulate on the coil, but is located in a defined receiving position A between an output 8 of the spinning unit 3 and the winding device 4. From there, it can be easily received and spun back in by the handling elements 10, 16, 17, 18 of the work station 2. Since the thread end 6 on the coil side thereby essentially remains in its regular thread path, after spinning in, it no longer needs to be inserted at the work elements of the work station 2, in particular the draw-off device 9, the yarn monitoring device 15 and the thread guide 11. In the present case, the receiving position A is located between the output 8 of the spinning unit 3 and the draw-off device 9. The thread seeking device of the present invention, in particular a movable thread seeking device for a multiple number of work stations, may be particularly advantageously deployed on a spinning machine, the work stations of which can be shut down in a controlled manner. With such machines, the thread seeking device is required only in the event of unplanned interruptions of the spinning process, such that only a few or even only one thread seeking device is to be provided for each spinning machine. However, a thread seeking device movable between multiple work stations is also advantageous at conventional work stations without the possibility of the controlled shutdown.
If an unforeseen interruption in the spinning process now arises, for example because of a thread breakage, the thread end 6 on the coil side accumulates on the surface of the coil 5. In this case as well, the movable thread seeking device 7 is provided in order to enable a resumption of the spinning process. The thread seeking device 7 may be positioned at the respective work station 2 and seek out the thread end 6 on the coil 5 by means of the movable suction nozzle 12. For this purpose, the coil 5 is driven against its regular direction of rotation by a drive (not shown) at the work station 2, such that the thread end 6 can be sucked into the suction nozzle 12. After the successful receiving of the thread end 6 in the suction nozzle 12, which can be detected by a sensor, the thread end 6 is received from the suction nozzle 12 by the transfer element 13, and is transferred to the pneumatic handling element 10 of the work station 2 in the form of a thread loop. The thread end 6 is now present in the defined receiving position A.
Upon the movement of the thread end 6 into the receiving position A, the thread end 6 is thereby simultaneously inserted into the work elements of the spinning unit, in the present case at least the yarn monitoring device 15 and the draw-off device 9, such that the thread end 6, just like that described in
Given the fact that, in the present case, the thread seeking device 7 must, with respect to the setting process, carry out exclusively the two functions of thread seeking and thread transfer, while the handling elements for spinning in 10, 16, 17, 18 are found at the work station 2, the thread seeking device 7 may be carried out with a highly simple design and may be produced cost-effectively. According to an additional design, the thread seeking device may also carry out a cutting operation, whereas, however, the thread seeking device 7 may still be designed very simply and cost-effectively. In addition, after the transfer of the thread end 6, the thread seeking device 7 immediately seeks out the next work station 2 at which a thread breakage has arisen. Since, in addition, the thread seeking device 7 is necessary solely in the event of an unforeseen, comparatively rare thread breakage, but not for predictable interruptions in the spinning operation, waiting times at the work stations 2 with corresponding production losses can almost be completely avoided.
In the present case, the suction nozzle 12 is designed to have a swiveling motion and for this purpose features a drive 14. However, the suction nozzle 12 may also be designed to be linearly movable or deliverable in another manner to the coil 5. It is also not absolutely necessary to provide a separate transfer element 13. Depending on the design and movability of the suction nozzle, the thread end 6 may be moved directly by the suction nozzle 12 into the receiving position A at the work station 2. It is also conceivable to arrange a multiple number of transfer elements 13 in the thread seeking device 7, in order to insert the thread F in the work elements of the spinning machine, in particular the draw-off device 9, the yarn monitoring device 15 and the thread guide 11, and to transfer it to the handling elements 10, 16, 17, 18. Finally, by way of deviation from the illustration shown here, a cutting device for the thread may be provided on the thread seeking device.
Finally,
Each work station 2 of the spinning machine 1 of
Moreover, in its structure and function, the thread seeking device 7 corresponds to the thread seeking device 7 of
In the present case, a situation in turn is presented in which a thread end 6 accumulated on the coil 5 has already been received by the suction nozzle 12 and has been moved by the transfer element 13 into the defined receiving position A, in which it now is in the form of a thread loop. The thread end 6 is received and fixed in the receiving position A in the handling element 10. As the yarn is now present in the defined receiving position, in turn, as with spinning in, it may be cut to length by the thread separating unit 16 after a controlled shut down, prepared for spinning back in by the thread preparing unit 17 and returned to it by the feedback unit 18 through the output 8 of the spinning unit 3.
The described thread seeking device 7 may be used in various spinning machines 1 such as air spinning machines or rotor spinning machines. Since the thread seeking device 7 is used only briefly for thread seeking and thread transfer to a work station 2, while all time-consuming work of the spinning-in process, in particular the cutting and preparation of the thread end 6, can be carried out directly by the work station 2, a significant time advantage compared to a conventional maintenance device arises. After the thread transfer into the receiving position has taken place, the thread seeking device 7 immediately seeks out the next work station, such that waiting times with corresponding production losses can be avoided. In the case of a work station that can be shut down in a controlled manner, that predictable interruptions of the spinning process can be processed without the thread seeking device 7 contributes to avoiding waiting times, such that this must be used only in the relatively few cases of unforeseeable thread breakages. Since the movable thread seeking device 7 may operate a multiple number of work stations 2 in a short time after one another, it is not necessary to arrange a cost-intensive thread seeking device with a high need for space at each of the work stations 2. It is also advantageous that the number of the thread seeking devices 7 at a spinning machine can be adapted without any problems for different machines lengths or different numbers of work stations 2 or for the expected fiber breakage rate. The proposed thread seeking device 7 may also be produced very cost-effectively, since, in addition to its basic components such as the frame 20, the chassis 21, and devices for supplying power and control, it features as work elements only one suction nozzle 12 and one or more transfer elements 13.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2015 108 740.5 | Jun 2015 | DE | national |
