Splicing method and splicing apparatus

Abstract

A splicing method of a splicing device on a ring spinning machine with a plurality of spinning stations, from which rovings are brought out from delivery rolls and are converted into yarn and are wound on a tube, in the event of a yarn break, the splicing device produces a splice in which a yarn end is connected to a roving coming out from a delivery roll and the spinning process is continued. Alternatively according to procedure a), a yarn end of the broken yarn is searched for, the found yarn end is detected and is used for splicing to obtain a tube without yarn interruption, or according to procedure b), an auxiliary yarn from a yarn supply is fastened to the tube, then the auxiliary yarn is separated to obtain a yarn end fastened to the tube, and the yarn end is used for splicing to obtain a tube with yarn interruption. Depending on the degree of utilization of the capacity of the splicing device and / or the possible prospect of success of procedure a), it is selected whether a yarn end is provided according to procedure a) or b), assuming that procedure a) takes more time than procedure b.

Description

TECHNICAL FIELD

[0001] The invention relates to a splicing method for a splicing device of a ring spinning machine having a plurality of spinning stations, at which a roving is converted into a yarn from a delivery roller of a drafting system and is wound onto a tube bobbin by a rotor and a rotating tube, in the event of a yarn breakage, the splicing device automatically produces a splice, in which a yarn end is connected to the roving from the delivery roller and the spinning process is then continued, and alternatively according to procedure a), a yarn end of the broken yarn is searched for, detected and used for the splice in order to obtain a tube bobbin without a yarn interruption, or according to procedure b), an auxiliary yarn from a yarn supply is fastened to the tube bobbin, is then detached in order to obtain a yarn end fastened to the tube bobbin and is used for the splice in order to obtain a tube bobbin with a yarn interruption, and to a suitable splicing device. BACKGROUND

[0002] From DE 23 51 312 A1 a splicing device is known, which is equipped with means for carrying out two different splicing methods. On the one hand, the splicing device can search for a yarn end on the tube bobbin and connect it to the fiber composite in the drafting system. On the other hand, it can also splice the yarn with an auxiliary yarn, which is placed on the tube bobbin and then fed into the drafting system. It primarily attempts to carry out a splicing method, in which an end of the broken yarn is searched for on the tube bobbin and connected to the yarn end. Only when this method cannot be carried out, the yarn is thrown onto the tube bobbin and spliced to the yarn according to the second procedure described.

[0003] This ensures that the repair of the broken yarn will not fail in any case, since a yarn end cannot be found on the tube bobbin and only in the event that the broken yarn cannot be repaired in any other way, there is a yarn interruption in the winding of the tube bobbin.

[0004] However, disadvantageous in this case is that the described procedure is very time-consuming. It is always attempted to first find a yarn end on the tube bobbin. Only when this attempt fails, an auxiliary yarn is used to repair the yarn interruption. As a result, the splicing device is tied up for a considerable amount of time at the respective spinning station. Other spinning stations, for which the splicing device is required to splice the yarn, cannot be produced at the same time. SUMMARY

[0005] It is an object of the invention to eliminate the disadvantages known from the prior art and in particular to increase the productivity of a ring spinning machine.

[0006] The problem is solved by the splicing method and the splicing device having the features of the invention.

[0007] A splicing method for a splicing device of a ring spinning machine is proposed, which ring spinning machine has a plurality of spinning stations, at which rovings are brought out of the delivery roller of a drafting system and are converted into yarn and are wound onto a tube with the aid of a rotor and a rotating tube. In the event of a yarn breakage, the splicing device automatically produces a splice, in which a yarn end is connected with a roving coming out of the delivery roller. The rotation process is then continued. Alternatively, according to procedure a), the yarn end of the broken yarn is searched for, the found yarn end is detected and used for splicing in order to obtain a tube without a yarn interruption. Alternatively, according to procedure b), a yarn end of an auxiliary yarn from a yarn supply is fastened to the tube, the auxiliary yarn is then separated in order to obtain another yarn end fastened to the tube and this other yarn end is used for splicing. In this way, a tube with a yarn interruption is obtained. The method produces a higher quality tube, since it does not contain any yarn interruption and, therefore, further processing on the winding machine can also take place substantially without interruption.

[0008] The splicing according to procedure a) is more time-consuming for the splicing device, since the yarn end has to be searched for and found somewhere on the tube. The success rate in procedure a) is also lower than in procedure b), since it can happen that the yarn end on the tube is only found after a long time or not at all.

[0009] According to the degree of capacity utilization of the joint device and / or the possible prospects of success of procedure a), it is selected accordingly whether the yarn end is provided according to procedure a) or according to procedure b). If procedure a) is assumed to take more time than procedure b), the joint device can be operated particularly effectively with the method according to the application. A compromise is thus achieved between the productivity of the ring spinning machine and the quality of the tube. It is assumed that a tube of higher quality is a tube without yarn interruptions. In principle, the best possible quality of the tube is accordingly attempted. This good quality is desired in the joint device in which the yarn end is picked up by the tube and is fed to the drafting system of the ring spinning machine in order to be connected to the band of fibers located in the drafting system of the ring spinning machine (procedure a). This results in a tube without interruptions of yarn on the tube. A tube without heterogeneous yarn or without yarn interruptions is considered to be a tube of higher quality. However, if it is attempted to always joint according to this procedure a), the productivity of the ring spinning machine would thus be impaired, since this procedure takes longer and, in addition, usually also involves a higher risk associated with the success of the joint. The application therefore proposes that, under certain conditions, not procedure a) but procedure b) is selected in order to produce the joint device. It is thus decided whether to joint with procedure a) and thus to achieve a tube of higher quality or whether to joint with procedure b) and thus to achieve a tube of slightly poorer quality, but to achieve a fast completion of the production sequence. According to the application, this decision depends on the degree of capacity utilization of the joint device and / or the possible prospects of success of procedure a). The production quantity of the ring spinning machine can thus be optimally controlled in terms of the production quality of the tubes.

[0010] If the joint device is heavily utilized, i.e. there are, for example, already requests for broken yarns from a plurality of other spinning stations to be repaired, it is attempted to increase the productivity of the ring spinning machine as much as possible to select procedure b), since this allows the joint device to complete the work to be processed in less time. In comparison to the execution of the more time-consuming procedure a) at each spinning station and the joint device needing a longer time until all the work to be executed beforehand has been completed, the respective spinning stations are accordingly also deactivated for a shorter time. However, the tubes produced on the ring spinning machine with the joint according to procedure b) will have yarn interruptions in the area of the joint with the auxiliary yarn.

[0011] The same selection is also made if the probable prospect of success of the procedure a) is low. This can be the case, for example, if the key yarn is spun on the spinning station, which is problematic for finding the yarn end on the tube. Another reason can also be that the device required for the process of searching for the yarn end on the tube cannot or cannot fully work. It is also advantageous in this case to select the procedure b) immediately instead of attempting the procedure a), at least until the required faulty device for locating the yarn end is repaired. In order to benefit the productivity of the ring spinning machine, it is therefore acceptable to produce the tube with a yarn interruption in the joint region. The ring spinning machine is thus able to operate as efficiently as possible in this sense.

[0012] The method according to the invention thus has the advantage that the productivity of the ring spinning machine can be significantly increased since the joint device is able to alternatively select the procedure a) or the procedure b) as the preferred procedure for eliminating the joint. This selection takes into account the procedures a) or b) with which the ring spinning machine is also able to produce the highest possible tube quality or the highest possible number of tubes without interruption of the yarn at the highest possible productivity. In one aspect, if there is sufficient time available, the joint device is attempted to be obtained particularly high quality, as is possible with the procedure a), since the joint device is not required at any other spinning station. Since this procedure a) is very time-consuming compared to the procedure b), in order to benefit the productivity of the ring spinning machine, the downtimes of the individual spinning stations are attempted to be as short as possible, the joint device thus attempts to have the individual spinning stations produce again as quickly as possible at the expense of the tube quality. In the time-critical case of the ring spinning machine, the procedure b) for joining the new yarn to the requested spinning station of the ring spinning machine is accordingly selected without the preceding procedure a).

[0013] It is also advantageous if the tube is produced without yarn interruption or if there is already a predetermined number of yarn interruptions on the tube to select the procedure a). If possible, the procedure a) for joining the yarn interruption is first attempted if a particularly high-quality tube is to be produced without yarn interruption. The longer processing time is not taken into account, but rather the quality of the tube. It can also be advantageous if the required quality of the tube allows a predetermined number of yarn interruptions on the tube, but a number exceeding this predetermined number is no longer accepted. In this case, the alternative method of the invention is used as long as the predetermined number of yarn interruptions is allowed. The first attempt is thus always successfully using the procedure a).

[0014] It is advantageous if the number of spinning stations waiting for the splicing device exceeds a predetermined number, then the procedure b) is selected. If a yarn breakage exists at this predetermined number of spinning stations and thus the respective spinning stations cannot produce any further yarn, the faster procedure b) is selected until the predetermined number of spinning stations is again below this limit. Thereafter, the alternative procedure a) or b) according to the application is used again.

[0015] It is also advantageous if the yarn spun on the spinning stations exceeds a predetermined yarn count, then the procedure b) is selected. If the predetermined yarn count is exceeded, i.e. very fine yarns exist, experience has shown that it is more difficult to find the yarn end on the tube. Therefore, it is necessary to plan for a longer time until the yarn end is usually found or it can even be assumed that the yarn end is often not found at all. In this case, it is advantageous to select the safe procedure b) so that the splicing device is not held at the individual spinning stations for too long.

[0016] It is also advantageous if the repair of a yarn breakage using the procedure a) is not successful, then the procedure b) is selected. In order to obtain a high-quality tube with as few yarn interruptions as possible inside the tube, it is advantageous to first attempt the procedure a). Only when this procedure a) is not successful is the procedure b) used.

[0017] It is advantageous if the means for searching for the yarn do not work for the procedure a), then the procedure b) is selected. Such means for searching for the yarn can be, for example, a suction nozzle which searches the surface of the tube for the yarn end. Such a suction nozzle is usually also designed to be movable. For example, if the drive of the suction nozzle has failed, the splicing device remains in operation since it can continue to perform the splicing process using the procedure b) and the productivity of the ring spinning machine is not reduced and the quality of the tubes produced is only slightly reduced.

[0018] It is also advantageous that the selection of the procedure a) or b) is made by the control device of the spinning machine or by the operator. The control device can process information from the status of all spinning stations of the ring spinning machine and select the most productive procedure a) or b) for the splicing device. It can also be advantageous for the preferred procedure a) or b) to be set manually by the operator, in particular if the operator determines that certain means of the splicing device are not functioning.

[0019] Advantageously, the end of yarn of the broken yarn is searched for on the tube or at a predetermined position of the spinning station in procedure a). In the case of procedure a), the end of yarn of the tube has to be grasped. In order to be able to find the end of yarn of the tube as quickly as possible, the end of yarn is searched for on the surface of the tube. Alternatively, a predetermined position can also be provided at the spinning station in order to find the end of yarn as quickly as possible. For example, in the case of a purposeful interruption of the spinning process, the end of yarn at the spinning station can be stopped before it reaches the tube and can be picked up again at this point by the splicing device.

[0020] It is also advantageous to draft the end of yarn into the rotor and / or the guide. The splicing device is preferably able to thread the end of yarn from the drafting system or from an auxiliary yarn supply, which carries an auxiliary yarn through the rotor and / or the guide of the spinning station.

[0021] It is also advantageous to mark whether the tube has a splice according to procedure a) and / or b) and / or how much length of yarn is wound on the tube between two yarn interruptions. For example, such a marking can be done by a data carrier connected to the tube. It can be recorded on the data carrier whether and how many splices according to procedure a) or procedure b) are contained on the tube. Information about the length of yarn wound on the tube between two yarn interruptions can also be recorded on the data carrier. This is advantageous for further processing of the tube on a subsequent winding machine. The data carrier can be designed to be electronically or optically readable, for example with a label that can be read by an operator, but the data carrier can also be connected to the tube. The marking can be carried out directly or indirectly on the tube. For example, the data carrier can be fastened on the tube itself or on a transport device for the tube on which the tube is arranged. The data can also be recorded directly or indirectly on the data carrier. Thus, on the one hand, the data carrier can have the respective information directly, i.e. itself. However, the tube can also have an indirect, for example fixed, constant marking, for example a number, and this number is linked in a database with the respective information about procedure a) or b) or the length of the individual yarn portions.

[0022] During further processing of similar yarns and / or cones on subsequent preparation stations and / or winding machines, the selection of the procedure a) or b) is advantageously made on the basis of the experience value. For example, during further processing, it can be determined that a maximum number of yarn interruptions (for example, a maximum of 3 yarn interruptions or heterogeneous yarns per cone or a maximum of 120 yarn interruptions or heterogeneous yarns per batch) can exist on the cones or in the batch, otherwise the efficiency of the winding machine is significantly reduced. With this experience, the maximum number of yarn interruptions, i.e. joints according to the procedure b), which can be allowed on the ring spinning machine in the case of similar yarns or cones, can be limited. For example, the efficiency of the winding machine can be reduced due to the too much time spent on preparing the yarn ends.

[0023] In an advantageous embodiment of the application, the selection of the procedure a) or b) can also be determined if the successful implementation of the procedure a) and / or b) is stored in a data memory and the likely prospect of a successful procedure a) is thereby determined, in particular in relation to a particular batch. If there is a high likely prospect of a successful procedure a) for the yarns of the respective batch, the procedure a) is more frequently used and more precisely the procedure b) is omitted.

[0024] If at the beginning of a batch the likely prospect of a successful procedure a) for the batch is advantageously used as a starting parameter and / or is updated during the run of the batch and stored in an updated manner at the end of the batch, the experience already made for other spinning with regard to the batch or the yarns can be used first. If in the further course of the demonstration new findings and experiences with regard to the prospect of a successful procedure a) occur, the experience value is also updated and saved and can be used again as a starting parameter for the next batch. This has the advantage that the likely limits of the procedure a) can be applied at the beginning of the batch. Thus, the efficiency of the ring spinning machine can be optimized. For example, a dynamic optimization can be carried out during production. If the preparation station / winding machine is able to process the cones, although the number of heterogeneous yarns is relatively large, the number of permissible heterogeneous yarns can be increased and vice versa.

[0025] The joint device according to the application for forming a joint on a ring spinning machine has the means a) and b) for automatically jointing in the event of a yarn break in order to connect the yarn end to the roving.

[0026] The device a) has search and handling means to search for a yarn end of a broken yarn, to detect a found yarn end and to use it for a joint in order to obtain a tube with no yarn interruption. The device b) has fastening and handling means to fasten an auxiliary yarn from a yarn supply to the tube and then to detach the auxiliary yarn in order to obtain a yarn end fastened to the tube and to use it for a joint in order to obtain a tube with a yarn interruption. The search and handling means and the fastening and handling means can be realized in a single or in different structural units. According to the invention, the joint device comprises control means which are adapted to select whether to use the device a) or the device b) to provide the yarn end depending on the degree of utilization of the capacity of the joint device and / or the possible prospects of success of the device a). Thus, the joint device is able to operate as efficiently as possible, assuming that the device a) requires more time for a joint than the device b). Thus, the joint device according to the invention makes a significant contribution to the fact that the efficiency of the ring spinning machine is high and is not reduced by long idle times and waiting for the spinning stations of the joint device. Alternatively, the joint device uses the device a) or the device b) to perform the joint process depending on whether the quality of the produced tubes or the productivity of the spinning stations is required.

[0027] The ring spinning machine is equipped with a plurality of spinning stations at which the roving comes out of the delivery roller of the drafting system and is converted into a yarn and is wound on a tube with a rotor and a rotating tube. If the joint is connected according to the procedure a) or b) or is connected using the device a) or b), the spinning process can be continued again. The control means can work both automatically according to specified rules and be influenced and switched manually by the operator.

[0028] It is also advantageous if the device a) has at least one suction device. With the suction device, the device a) is able to suck a yarn end on the ground surface of the tube and to further process it for the joint process. The suction device can be designed to be movable, for example, in which it can be moved towards or away from the tube.

[0029] It is also advantageous if the device b) has an auxiliary bobbin for the yarn supply. The auxiliary yarn is stored on the auxiliary bobbin and is used by the device b) for the joint process as required. The auxiliary yarn can be of the same type as the yarn itself. However, it can also be different from the yarn, thus, for example, simplifying the joint process or it can be better distinguished from the ordinary yarn.

[0030] Furthermore, it is advantageous if the control device is adapted to evaluate information relating to the number of requests of the splicing device to the spinning machine. Based on the splicing processes to be processed to be carried out by the splicing device, it can be determined whether a slower device a) working with higher quality or a faster device b) working with less quality or differently is to be used in order to obtain a desired and permissible ratio of productivity and quality.

[0031] It is also advantageous if the splicing device and / or the control device cooperate with a marking device to mark the cop in order to mark whether the cop has a splice of the device a) and / or the device b). The marking device marks the cop directly or indirectly, for example by its transport carrier. This information can be passed on to the device controller in order to be able to deliver the respective cop to the appropriate further processing point.

[0032] Splicing robots for ring spinning machines are known, which, if possible, search for the yarn end on the cop and thus carry out the splicing process. If the yarn end cannot be found, spinning is carried out with an auxiliary yarn which is carried along. Since splicing with an auxiliary yarn can usually be carried out faster, significantly more yarn breaks per time and per splicing robot can be carried out in the case of a general splicing with an auxiliary yarn. In a simple embodiment, the operator can select in which mode (hybrid or only with auxiliary yarn) the splicing robot is to be operated. However, it is particularly advantageous if the machine itself decides according to an automatic efficiency optimization whether the search process for the thread end should be intensified or completely omitted due to the yarn breakage location (or the degree of capacity utilization of the splicing robot).

[0033] The device is designed according to the foregoing explanations and the features mentioned can exist individually or in any combination. The splicing device can be manufactured and sold together with the ring spinning machine. However, the splicing device can also be manufactured and sold as a separate structural unit and attached to an existing ring spinning machine. BRIEF DESCRIPTION OF DRAWINGS

[0034] Aspects of the application are explained in more detail using the embodiments shown in the following drawings and the associated description. In the drawings, schematically:

[0035] Figure 1 is a side view of a ring spinning machine and a splicing device;

[0036] Figure 2 shows a cop;

[0037] Figure 3 is a side view of a winding machine; and

[0038] Figure 4 shows a schematic top view of a spinning device. DETAILED DESCRIPTION

[0039] In the following description of alternative embodiments shown in the drawings, the same reference signs are used for features which are identical and / or at least comparable in terms of their design and / or mode of operation compared to the embodiments described above. Unless these are explained again in detail, the design and / or mode of operation of the features correspond to the design and mode of operation of the features already described above. For the sake of clarity, not all identical components are provided with reference signs, but they are drawn in the same way.

[0040] Figure 1 is a side view of a ring spinning machine 1 and a splicing device 2. The splicing device 2 is arranged in a mobile robot 3, which can be moved along the ring spinning machine 1 on a roller 4. The ring spinning machine 1 has a drafting system 5, which drafts a roving 6 with pairs of rollers running at different speeds and causes it to leave the drafting system 5 on a delivery roller 7. The drafted roving 6 then runs in a known manner through a guide 8 and a rotor 9 in order to be wound as a yarn 10 on a bobbin 11 in the end. The bobbin 11 is set in rotation by a drive 12, whereby the rotor 9 turns around the bobbin 11 and thus causes a rotation in the yarn 10. Figure 1 A spinning station 13 is shown, at which the yarn 10 is broken off and has to be spliced again to the roving 6. According to the illustration, a yarn end 14, which is the yarn end 10 wound on the bobbin 11, is sucked into a search and handling device 15 of the splicing device 2. The yarn end 14 is searched by the search and handling device 15 using suction means on the surface of the bobbin 11, through the rotor 9 and the guide 8 and is now ready to be spliced to the roving 6. To this end, the search and handling device 15 can be pivoted according to the double arrow shown and can also be designed to be movable in other ways, for example more linearly. The search and handling device 15 or the splicing device 2 can have additional handling elements (not shown) in order to be able to grasp the yarn end 14 on the bobbin 11, to lead it through the rotor 9 and the guide 8 and to splice it to the roving 6 in the drafting system 5.

[0041] The splicing device 2 also comprises a fastening and handling device 35 with a yarn supply 16. The yarn supply 16 is arranged in the robot 3 in the form of a bobbin. The yarn supply 16 has an auxiliary yarn 17, which can be pulled off the bobbin by a conveyor roller 18. According to the present embodiment, the conveyor roller 18 provides a yarn end 14' of the fastening and handling device 35. It moves in the direction of the yarn end 14' and causes the yarn end 14' to perform the splicing process. The conveyor roller 18 is set in rotary motion by a control device 19 and removes the required length of the auxiliary yarn 17 from the yarn supply 16. The control device 19 also ensures the corresponding movement of the search and handling device 15, the fastening and handling device 35 or other handling devices (not shown) of the splicing device 2 in order to be able to perform the splicing process correctly.

[0042] For the joint of the yarn end portion 14' of the auxiliary yarn 17, the yarn end portion 14' is placed on the tube yarn 11 and fastened there, for example by several turns (see Figure 2 ). The auxiliary yarn 17 is passed through the rotor 9 and the guide 8, comes into contact with the roving 6 and is separated before or after, so that the yarn end portion, which is not visible later, forms a joint with the roving 6 in the drafting system 5.

[0043] The control device 19 provides the joint device 2 with a signal as to whether the yarn end portion 14 or the yarn end portion 14' is to be used for the joint device. This decision is made depending on the degree of utilization of the capacity of the joint device 2 and / or the possible success prospects when using the yarn end portion 14 for the joint. The yarn end portion 14 is preferably used for the joint since there is no yarn interruption on the tube yarn 11 when the yarn 10 of the direct spinning tube yarn 11 and its yarn end portion 14 are joined. However, it is disadvantageous in this case that finding the yarn end portion 14 on the tube yarn 11 is time-consuming and not always successful. If the joint device is therefore required to spin at a plurality of further spinning stations 13, since there are also yarn breaks there, it is advantageous according to the application that the joint device 2 uses the auxiliary yarn 17 for a faster and safer joint process. In this case, the yarn end portion 14' of the auxiliary yarn 17 is clamped at a predetermined point on the conveyor roller 18 and placed on the tube yarn 11. This yarn end portion 14' forms an interruption in the yarn 10 located on the tube yarn 11. This interruption of the yarn 10 on the tube yarn 11 leads to an interruption of the winding process during further processing, for example on a winder, and possibly to a reduction in the efficiency of the winder there. However, this process is more advantageous for the productivity of the ring spinning machine 1 since a better but more time-consuming joint is made with the yarn end portion 14, but in order not to unnecessarily reduce the productivity of the spinning machine 1, the auxiliary yarn 17 with its yarn end portion 14' is used in the case of an exceptional work load or if it is foreseeable that the yarn end portion 14 can only be found on the tube yarn 11 very badly or not at all.

[0044] A marking device 20 is provided in order to mark the tube yarn 11 as a tube yarn 11 with one or more yarn interruptions due to the joint using the yarn end portion 14' or as a tube yarn 11 without yarn interruptions during further processing. The marking device 20 marks the tube yarn 11, for example by a corresponding marking or inscription on a data carrier 21 (see Figure 2 ). Thus, for example, the tube yarn 11 can be specially treated during further processing if it has yarn interruptions. This special treatment can mean that the subsequent machines, for example winders, can work as productively as possible despite the yarn interruptions.

[0045] Figure 2A cop 11 is shown, which is connected with a peg tray 22. The peg tray 22 is a transport element with which the cop 11 can be transported in a spinning apparatus. For this purpose, the cop 11 is attached to the peg tray 22 via a sleeve 23 on which the yarn 10 is wound. A data carrier 21 is provided for noting whether there is a yarn break on the cop 11 or how many yarn breaks there are. The data carrier 21, which is shown here for example in the form of a bar code, can be identified at a corresponding identification point on the spinning apparatus and evaluated with regard to further processing of the cop 11. The data carrier 21 can be fastened for example to the sleeve 23. However, it can also be provided on the peg tray 22. In addition to the information about the presence of a yarn break, the data carrier 21 can also provide information about the length of at least one yarn portion wound on the cop. In Figure 2 In the middle, a yarn end 14'' can also be seen, which lies on the surface of the cop 11. This yarn end 14'' forms the end of the complete yarn 10 wound on the cop 11. On the other hand, the dashed line indicates that there is a yarn break on the cop 11. Thus, a yarn end 14 is shown, which has arisen since the beginning of the winding of the cop 11 with the yarn 10 as a result of a yarn break. By making a splice with the auxiliary yarn 17 (see Figure 1 ), a further yarn end 14' is formed on the cop 11, which, since it is not visible, is also indicated with a dashed line. Since, after the splice with the auxiliary yarn 17, further yarn 10 is wound on the cop 11, this yarn end 14' now lies in the interior of the cop 11. In some cases, this yarn end 14' can also be visible, for example if it is fixed in a defined position on the sleeve 23. Usually, the yarn end 14' as well as the yarn break are not visible in the cop 11. Therefore, it is advantageous to note on the data carrier 21 whether the yarn break, i.e. the yarn ends 14 and 14', lie in the interior of the cop 11 or how many yarn breaks there are.

[0046] Figure 3A sketch showing a side view of the winding machine 25 is shown. From the tube yarn 11a arranged on the peg tray 22, the yarn 10 is wound on a cross-wound bobbin 26. On the winding machine 25, a suction tube 27 is arranged which can be pivoted according to a double arrow and a gripper 28 which can also be pivoted and optionally linearly moved. Only one of a plurality of winding stations 29 of the winding machine 25 is shown. With the suction tube 27, after a yarn breakage, a yarn end which has been wound on the cross-wound bobbin 26 can be searched for and detected. The sketched gripper 28 is also able to search for a yarn end 14 from the tube yarn 11a and to grasp it after a yarn breakage. Both yarn ends can then be introduced into a splicing device 30 and connected to one another in a known manner. A yarn breakage can occur during a normal winding process. A yarn breakage also occurs if there is a yarn interruption with two yarn ends 14 and 14' on the tube yarn 11a. As mentioned above, these two yarn ends 14 and 14' are formed when the auxiliary yarn 17 is spliced to the ring spinning machine 1 upstream. This yarn interruption is wrapped with the yarn 10 during the subsequent further spinning of the yarn 10 on the ring spinning machine 1. However, during the unwinding of the yarn 10 on the winding machine 25, this yarn interruption inevitably leads to an interruption of the winding process. In the case of such a yarn interruption, the yarn end 14' is wound on the cross-wound bobbin 26, while the yarn end 14 remains on the tube yarn 11a. However, the position of the yarn end 14 on the tube yarn 11a is not determined. Therefore, the tube yarn 11a is removed from the spinning station 29 and replaced by a tube yarn 11b. In the tube yarn 11b, a yarn end 14'' which is located outside the tube yarn 11b has been placed in a defined position in a preparation station and can therefore be quickly picked up by the gripper 28.

[0047] Figure 3 Different variants of the tube yarns 11a to 11d are shown. While the tube yarn 11a currently is unwound and two yarn ends 14 and 14' are still inside it, the tube yarn 11b behind has a yarn end 14'' in a defined position on its outer circumference. Inside the tube yarn 11b two yarn interruptions can be found. Therefore, two yarn ends 14 and two yarn ends 14' exist inside the tube yarn 11b. In contrast, the tube yarn 11c has no yarn interruption at all. If no yarn breakage occurs during the rewinding process, the yarn 10 will be able to be completely wound on the cross-wound bobbin 26 through this tube yarn 11c. Finally, in the tube yarn 11d, again a yarn interruption with a yarn end 14 and a yarn end 14' exists.

[0048] Figure 4 A sketch showing a plan view of the spinning plant 40 is shown. According to the present embodiment, a ring spinning machine 1 is shown in the spinning plant 40. Of course, a plurality of ring spinning machines 1 can exist in the spinning plant 40. The ring spinning machine 1 has a plurality of spinning stations 13. With its splicing device 2 (seeFigure 1 ) and, if necessary, perform joint processing at the respective tube yarn spinning station 13. The finished tube yarns 11 produced on the spinning stations 13 are then transferred to a transport device 41 which transports the tube yarns 11 (optionally on peg trays 22) to a preparation station 42. In the preparation station 42, the exposed yarn end is searched for by a yarn searching device 43 and placed at a defined point on the tube yarn 11. The tube yarn 11 is then transported on the transport device 41 to one of the plurality of winding machines 25. When the tube yarn 11 is rewound at the winding station 29 onto a crossover winding bobbin 26, the tube yarn 11 is removed from the winding station 29 and fed back to the preparation station 42 as soon as a yarn breakage occurs. The now exposed yarn end 14'' of the yarn breakage can be searched for again and placed again at a defined point on the tube yarn 11. This tube yarn 11, now only partially wound, is fed again to the winding station 29 of one of the winding machines 25.

[0049] The tube yarns 11 transported on the transport device 41 are marked in order to record the number of known yarn interruptions caused by the joint processing of the auxiliary yarn 17 on the ring spinning machine 1. This marking of the tube yarns 11 is read by an identification device 44 and transmitted to a device controller 45. The device controller 45 is connected to all the essential devices of the spinning device 40. The marking of the tube yarns 11 can be in the form of an optically readable code, for example a bar code or a pixel code, or in the form of a data carrier connected to the tube yarn 11, which has been marked accordingly and can be read electronically. The marking of the tube yarns can also be done in such a way that the auxiliary yarn 17 used for the joint inside the tube yarn 11 is different from the normal yarn 10 used for the rest of the winding. A constant marking of the tube yarn 11, for example a number of the tube yarn 11, can also be linked to data in a database, for example in the device controller 45, in which information about this tube yarn 11 is stored.

[0050] The delivery controller 46 is instructed via the device controller 45 that the respective identified tube 11 is to be fed to a specific winding machine 25 or to a specific winding station 29 via a delivery path 47. Tube 11 s containing one or even more known yarn interruptions are preferably fed to winding machines 25 or winding stations 29 that are located near the preparation station 42. Since for this type of tube 11 with known yarn interruptions it can be safely assumed that they have to be fed again to the preparation station 42, this control of the tube 11 means that the return delivery path from the winding station 29 to the preparation station 42 can be kept as short as possible. These short delivery paths for the tube 11 allow a faster re-feeding of the prepared tube 11 to the winding station 29, which is expected to have to be delivered more frequently to the preparation station 42. In contrast thereto, tube 11 s without at least a known yarn interruption are delivered by winding machines 25 or winding machines 25 further away from the preparation station 42 to the winding station 29, since in the case of these tube 11 s it is assumed that they do not have to be returned to the preparation station 42 (at least not definitely). Overall, the processing program is thus shortened and accelerated, the result of which is that all tube 11 s present can be processed faster.

[0051] Depending on the degree of capacity utilization of the winding machines 25 or winding stations 29, tube 11 s with at least one additional, known yarn interruption can be fed to the parking position 48 or processed primarily before other tube 11 s. When the winding machines 29 are started after a change process on the ring spinning machine 1, all winding stations 29 of the winding machine 25 must be supplied with tube 11 s as quickly as possible. There, tube 11 s that have to be changed again after a short operating time are to be avoided, since they have an additional known yarn interruption, thus additionally burdening the preparation station 42. Such type of tube 11 s are therefore preferably fed to the parking position 48 in order not to hinder other tube 11 s. When all winding stations 29 are in operation and there are enough prepared tube 11 s in the system, one can preferably process tube 11 s with an additional known yarn interruption. Thus, depending on the phase or capacity utilization of the winding machine 25, such tube 11 s are either processed preferentially or ignored.

[0052] Even if there are multiple preparation stations 42 in the spinning device 40, the device controller 45 can determine after recognizing the number of yarn interruptions in the tube yarn 11, to which preparation station 42 the tube yarn 11 is preferably delivered. It can be provided, for example, that certain preparation stations 42 are particularly dedicated to searching for yarn ends 14' which originally lie inside the tube yarn 11 and are therefore more difficult to find than yarn ends 14'' which lie on the circumference of the finished tube yarn 11 after leaving the ring spinning machine 1. Such a dedicated treatment can include, for example, a stronger or longer suction of the tube yarn 11 in order to be able to find this more difficult yarn end 14'' more easily. The preparation stations 42 dedicated to this manner do not block the tube yarn 11, the yarn end 14'' of which can be found more quickly and easily. The tube yarn 11 with a known yarn interruption can thus be fed to a predetermined preparation station 42 and / or to a predetermined winding machine 25 or winding station 29.

[0053] The application is not limited to the embodiments shown and described. Modifications within the scope of the claims are possible, such as combinations of features, even if these are shown and described in different embodiments.

[0054] List of reference signs

[0055] 1 ring spinning machine

[0056] 2 joint device

[0057] 3 robot

[0058] 4 roller

[0059] 5 drafting system

[0060] 6 slubbing

[0061] 7 delivery roller

[0062] 8 guide

[0063] 9 rotor

[0064] 10 yarn

[0065] 11 tube yarn

[0066] 12 drive

[0067] 13 spinning station

[0068] 14 yarn end

[0069] 15 searching and treatment device

[0070] 16 yarn supply

[0071] 17 auxiliary yarn

[0072] 18 conveyor roller

[0073] 19 control device

[0074] 20 marking device

[0075] 21 data carrier

[0076] 22 pin tray

[0077] 23 sleeve

[0078] 25 winding machine

[0079] 26 cross-wound bobbin

[0080] 27 suction tube

[0081] 28 gripper

[0082] 29 winding station

[0083] 30 splicing device

[0084] 35 fastening and handling device

[0085] 40 spinning device

[0086] 41 conveying device

[0087] 42 preparation station

[0088] 43 yarn search device

[0089] 44 identification device

[0090] 45 device controller

[0091] 46 conveying controller

[0092] 47 conveying path

[0093] 48 parking position.

Claims

1. A splicing method for a splicing device (2) for a ring spinning machine (1), the ring spinning machine having a plurality of spinning stations (13), at which roving (6) emerges from the conveying roller (7) of the drafting system (5) and is converted into yarn (10) and wound onto the bobbin (11) by means of a rotor (9) and a rotating bobbin (11), in, In the event of yarn breakage, the splicing device (2) automatically generates a splice in which the yarn ends (14, 14') are connected to the roving (6) exiting from the conveying roller (7), and the spinning process then continues. Alternatively, according to - Procedure a) searches for the yarn end (14) of the broken yarn (10), and the found yarn end (14) is detected and used for splicing to obtain a bobbin (11) without yarn breaks; or -According to procedure b), an auxiliary yarn (17) from the yarn supply source (16) is fastened to the bobbin (11), and then the auxiliary yarn (17) is separated to obtain a yarn end (14') fastened to the bobbin (11), and the yarn end (14') is used for splicing to obtain a bobbin (11) with a yarn break. Its features are, Based on the capacity utilization of the splicing device (2) and / or the likely prospects of success of procedure a), the choice is made whether to provide the yarn ends (14, 14') according to procedure a) or procedure b), assuming that procedure a) takes more time than procedure b). If the number of spinning stations (13) waiting for the splicing device (2) exceeds a predetermined number, then procedure b) is selected.

2. The joint method according to claim 1, characterized in that, If the yarn tube (11) will be produced without yarn breaks, or if a predetermined number of yarn breaks already exist on the yarn tube (11), then select procedure a).

3. The joint method according to claim 1 or 2, characterized in that, If the yarn (10) spun at the spinning station (13) exceeds the predetermined yarn count, then select procedure b).

4. The joint method according to claim 1 or 2, characterized in that, If program a) fails to repair the yarn breakage, then select program b).

5. The joint method according to claim 1 or 2, characterized in that, If the device used to search for the yarn (10) does not work for procedure a), then procedure b) is selected.

6. The joint method according to claim 1 or 2, characterized in that, The selection of program a) or b) is made by the control device of the spinning machine, by the equipment controller (45), or by the operator.

7. The joint method according to claim 1 or 2, characterized in that, In procedure a), the yarn end (14) of the broken yarn (10) is searched on the bobbin (11) or at a predetermined location in the spinning station (13).

8. The joint method according to claim 1 or 2, characterized in that, The yarn ends (14, 14') are drawn into the rotor (9) and / or the yarn guide (8).

9. The joint method according to claim 1 or 2, characterized in that, The tube (11) is marked to determine whether it has a splice according to procedure a) and / or b) and / or the length of the yarn (10) wound on the tube (11) between two yarn breaks.

10. The joint method according to claim 1 or 2, characterized in that, During the subsequent processing of similar yarns (10) and / or bobbins (11) at the preparation station (42) and / or winding machine (25), the choice of procedure a) or b) is made based on empirical values.

11. The joint method according to claim 1 or 2, characterized in that, Successful implementation of procedures a) and / or b) is stored in the data memory, thereby determining the probable prospects of success for procedure a).

12. The joint method according to claim 11, characterized in that, Successful implementation of procedures a) and / or b) is stored in the data memory, thereby determining the probable prospects of success of procedure a) for a particular batch.

13. The joint method according to claim 1 or 2, characterized in that, At the start of a batch, the probable success of program a) in the batch is used as a start parameter and / or updated during the run of the batch, and stored in an updated manner at the end of the batch.

14. A splicing device for producing a splice in a ring spinning machine (1), in, In the event of yarn breakage, the splicing device (2) has means a) and b) for attaching the yarn ends (14, 14') to the roving (6) for automatic splicing, and The device a) includes a searching and processing device (15) for searching for the yarn ends (14, 14') of a broken yarn (10), detecting the found yarn ends (14, 14'), and using them for splicing to obtain a bobbin (11) without yarn breaks. The device b) has a fastening and processing device (35) for fastening an auxiliary yarn (17) from a yarn supply source (16) onto the bobbin (11), then separating the auxiliary yarn (17) to obtain yarn ends (14, 14') fastened to the bobbin (11), and using the yarn ends (14') for splicing to obtain a bobbin (11) with yarn breaks. Its features The splicing device (2) includes a control device (19, 45) adapted to select, based on the capacity utilization of the splicing device (2) and / or the likely prospects of success of device a), whether to use device a) or b) to provide the yarn end (14, 14'). The control devices (19, 45) are adapted to evaluate information relating to the number of requests made by the splicing device (2) to the spinning machine (1).

15. The connector device according to claim 14, characterized in that, The splicing device (2) cooperates with an evaluation device adapted to evaluate the timing and / or the likelihood of success of the device a) and / or the device b) used for splicing the yarn (10).

16. The connector device according to claim 14 or 15, characterized in that, The device a) has a suction device.

17. The connector device according to claim 14 or 15, characterized in that, The device b) has an auxiliary tube for the yarn supply source (16).

18. The connector device according to claim 14 or 15, characterized in that, The splicing device (2) and / or the control device (19, 45) cooperate with the marking device (20) to mark whether the yarn tube (11) has a splice of the device a) and / or the device b).

Images