DEVICE AND METHOD FOR CARRYING OUT CLEANING A HEAD SLEEVE ARRANGED ON A MOUNTING SCREEN OF A MOVABLE CARRIER OF A HEAD AND SLEEVE TRANSPORT SYSTEM

Description

[0001] The invention relates to a method for cleaning a coping sleeve arranged on a mounting mandrel of a movable carrier of a coping and sleeve transport system, with stripping jaws of a thread stripping device adjustable in the longitudinal axis direction of the mounting mandrel along the surface of the coping sleeve, comprising the steps Locking the coping sleeve onto the mounting mandrel by means of a hold-down device with a hold-down element, applying the stripping jaws to the surface of the coping sleeve, starting the stripping process by moving the stripping jaws over a defined cleaning distance along the surface of the coping sleeve towards the upper end of the coping sleeve facing the hold-down element.

[0002] Especially for automatic winding machines, it has long been known to transport the bobbins produced in a ring spinning machine, which serve as unwinding bobbins, as well as empty bobbins or partially wound bobbins, by means of movable carriers within closed transport circuits.

[0003] The necessary head and sleeve transport system typically features a conveyor belt guided along a track, on which the carriers with their vertically arranged mounting mandrels circulate. The head sleeves are mounted onto the mounting mandrels of the carriers and remain on these carriers during feeding, unwinding, and also as empty sleeves during return.

[0004] The cop and cartridge transport systems preferably have several transport loops that lead either to the individual winding stations or to specific processing equipment, such as cop preparation devices, cartridge cleaning devices, or mounting devices. For cops requiring manual intervention, there are alternative track sections where they are temporarily stored and accessible to the operating personnel.

[0005] Depending on the winding status of the respective core, the carrier supporting it is transported to the designated processing station, e.g., to a core cleaning unit or a core preparation unit. A core that is completely unwound is considered empty. A core typically referred to as a residual core has a small amount of remaining thread, which is usually detected by a core monitor located at the winding point. If the amount of remaining thread on a residual core falls below a predetermined quantity, it is not rewound. Conversely, if the amount of remaining thread on a partially unwound core exceeds a predetermined quantity—for example, because the thread start could no longer be detected after a thread break at the winding point, or because a yarn cleaner detected a number of yarn defects exceeding a limit—it is considered an alarm core.Unpreparable bobbins are those bobbins where the thread end could not be prepared appropriately for the winding process, so that the bobbin preparation device then outputs a bobbin that contains the entire original amount of thread, but is not forwarded to the winding station.

[0006] A device for removing a winding residue from a textile winding machine is known from DE4332787A1.

[0007] Cartridge cases with residual thread, as well as alarm cases or cases that can no longer be prepared, must be cleaned of the thread before they can be rewound. This is done in cartridge case cleaning units, for example, by stripping jaws to remove the residual thread from the cartridge case. If the amount of residual thread exceeds a predetermined limit, the cleaning process may fail, as experience has shown that such cartridge cases can cause the stripping jaws to become blocked, potentially destroying the entire cartridge case. Therefore, if a cartridge case with excessive thread residue is detected, for example, by a cartridge case monitor, then, as with alarm cases and cases that cannot be prepared, operator intervention is required to clean the cartridge case.

[0008] Based on this, the invention aims to provide a device and a method for cleaning a coping, which ensures reliable cleaning even with an increased amount of residual thread.

[0009] The invention solves the problem by means of a method with the features of claim 1 and a device with the features of claim 6. Advantageous further developments of the method according to the invention are specified in dependent claims 2 to 5.

[0010] A characteristic feature of the method according to the invention is that the movement speed of the stripping jaws is detected during the stripping process and, if a defined minimum speed is undershot, a fault correction process is carried out in which the stripping jaws, the surface of the cop sleeve is disengaged, then moved within the cleaning path towards the hold-down element into an intermediate position and subsequently placed back against the surface of the cop sleeve in the intermediate position, after which the wiping process is restarted until the end of the cleaning section is reached, and then the wiping process is repeated as a supplementary wiping process in the area of ​​the position of the wiping jaws at the beginning of a previous troubleshooting process until the entire cleaning section is cleaned.

[0011] According to the inventive method, a suitable control unit monitors the movement speed of the stripping jaws during the cleaning process of the head sleeve, i.e., while the stripping jaws are moved along the cleaning path on the surface of the head sleeve towards the hold-down element and thereby strip any remaining thread from the head sleeve. The control unit interrupts the stripping process if the speed falls below a preset minimum. A drop in the movement speed of the stripping jaws below the minimum speed during the cleaning process results from a blockage of the stripping jaws caused by the thread residue.Subsequently, after the wiping process is interrupted, the wiping jaws are lifted from the cylinder sleeve, then moved along the cleaning path towards its end and placed back against the cylinder sleeve in an intermediate position, from where the wiping process is then restarted.

[0012] The inventive method is based on the understanding that, after the relocation to the intermediate position, a smaller amount of thread initially needs to be stripped over the stripping jaws towards the hold-down device. This smaller amount offers less resistance to the stripping jaws, thus increasing the likelihood that the remaining, reduced cleaning path will be cleaned from the intermediate position towards the hold-down device without further interruption. After the stripping process from the intermediate position has been completed without any problems, i.e., after the remaining, predetermined cleaning path has been traversed, the stripping jaws are then reset to the position they occupied at the beginning of the troubleshooting process, i.e., the position in which they were previously lifted from the head sleeve.After the scraper jaws are positioned in this location, the remaining, uncleaned section of the cylinder head, between the scraper jaw position at the time of troubleshooting and the intermediate position, is cleaned by a supplementary scraping process. Reliable cleaning of the remaining cleaning path results from the reduced resistance encountered due to the previously completed cleaning of the cylinder head from the intermediate position to the end of the cleaning path.

[0013] The inventive method thus makes it possible to clean not only cops with an increased amount of residual thread, but also cops that, such as alarm cops or cops that cannot be prepared, have a high amount of thread on their surface which cannot be removed in a single pass. Crucially, the cleaning process involves monitoring the speed of the stripping jaws moving towards the hold-down element and interrupting the process if the speed falls below a predetermined minimum. Following this, the stripping jaws are moved within the cleaning path to an intermediate position on the cop, facing the hold-down element, from which the cleaning process is restarted or continued.

[0014] Should the movement speed drop below the specified minimum speed again, a further troubleshooting step can be performed. In this step, the scraper jaws are lifted again and moved to another intermediate position, from where the cleaning process is restarted. Once the end of the cleaning path is reached during the cleaning process, the first supplementary scraping step is performed. In this step, the scraper jaws are moved to the position they were in at the beginning of the previous troubleshooting step, and the cleaning process is then started.

[0015] The number of supplementary wiper cycles thus results directly from the number of troubleshooting operations performed during cleaning. In each case, the wiper jaws are moved step-by-step to the positions they occupied at the beginning of the previous troubleshooting operation, and then the cleaning process is started. Should the movement speed fall below the defined minimum speed again during a supplementary wiper cycle, another troubleshooting operation is initiated.

[0016] The method according to the invention thus enables one- or multi-step cleaning of the surface of the cartridge case until it is completely free of thread residue. The method according to the invention also allows the parameters for the cartridge cases to be set on the cartridge case monitor in such a way that even cartridge cases that cannot be prepared in advance and alarm cartridge cases are directed to the cartridge case cleaning process, thereby completely eliminating the need for cleaning or preparation by the operating personnel.

[0017] The inventive method is based on the principle that, after an interruption of the stripping process due to a drop below a previously defined minimum speed, a fault clearance process is carried out. During this process, the cleaning process is interrupted and restarted at a higher point within the cleaning path on the head sleeve (relative to the operating position). From this point, the amount of residual thread to be stripped from the head sleeve offers less resistance to the stripping jaws. Should the speed again drop below the minimum threshold, even from this intermediate position, another fault clearance process is initiated. During this process, the stripping jaws are again positioned higher against the head sleeve, from where the stripping process is restarted.To ensure complete cleaning of the cylinder head, once the end of the cleaning path is reached, the scraper jaws must be moved back to the position they were in at the beginning of the previous clearing process. In the subsequent supplementary scraping process, it is generally possible to move the scraper jaws back to the end of the cleaning path. However, according to a particularly advantageous embodiment of the invention, the supplementary scraping process is limited to the area between the position of the scraper jaws at the beginning of the previous clearing process and the associated intermediate position.

[0018] According to this embodiment of the invention, the supplementary wiping process(s) to be carried out are performed only in the area between the position of the wiping jaws where the sleeve was previously lifted from the head and the intermediate position, i.e., where the wiping jaws were reapplied to the head during the troubleshooting process. This embodiment of the invention eliminates the need to perform the supplementary wiping processes all the way to the end of the cleaning section. Particularly when multiple troubleshooting processes are involved, this reduces the cycle time for cleaning such head sleeves.

[0019] The cleaning path can be determined in any way, but is usually determined by a casing monitor that detects the surface of the casing to be cleaned and determines the corresponding cleaning path based on the length of the yarn spools on the casing. If, advantageously, alarm casings or casings that cannot be prepared are also included, the cleaning path generally extends over the entire winding length of the casing, which can also be determined by a casing monitor. It is particularly advantageous that the cleaning path is determined by a sensory, especially optical, inspection of the casing.This embodiment of the invention allows the cleaning path to be limited to the necessary area on the coping sleeve, thereby additionally reducing the overall cleaning time and thus the cycle time for cleaning the coping sleeves.

[0020] In principle, the distance over which the wiper jaws are moved from the start of the fault clearance process to the intermediate position is freely selectable and can, for example, be set in a control unit. However, according to a particularly advantageous embodiment of the invention, the adjustment path of the wiper jaws between the position at the start of the fault clearance process and the intermediate position is set depending on the position of the wiper jaws in the longitudinal axis direction of the head sleeve and / or the number of previous fault clearance processes.

[0021] According to this embodiment of the invention, the control unit can regulate that if the minimum speed of the stripping jaws is undershot at the beginning of the stripping process, the displacement distance of the stripping jaws between their position at the beginning of the fault clearance process and the intermediate position is greater than is the case in a fault clearance process initiated when the stripping jaws – relative to their operating position – fall below the minimum speed at a higher point on the head sleeve. This reduces the number of fault clearance processes and the resulting supplementary stripping processes.It is assumed that even with a very early reduction in the wiping speed of the wiper jaws after the start of the cleaning process, a longer distance must be covered between the position of the wiper jaws at the start of the troubleshooting process and the intermediate position in order to be able to carry out the wiping process with the continued cleaning process until the end of the cleaning path.

[0022] It is also possible that the control unit increases the displacement distance based on the number of previous fault clearance operations, in order to reduce the overall number of fault clearance operations and the resulting supplementary wiper operations.

[0023] The minimum speed of the scraper jaws, which triggers the fault clearance process, is generally freely selectable and adjustable in the control unit. However, according to a particularly advantageous embodiment of the invention, the fault clearance process is only carried out when the scraper jaws have come to a standstill.

[0024] According to this embodiment of the invention, the movement speed of the scraper jaws is detected in the manner according to the invention, and a fault clearance is only carried out when the scraper jaws come to a standstill. This allows the number of fault clearance operations and the subsequent supplementary scraping operations to be reduced in a particularly significant way, since it is ensured that the maximum possible length of the cleaning path is cleaned by the thread scraper device before a fault clearance operation becomes necessary.

[0025] The invention further solves the problem by means of a device for carrying out a method for cleaning a cop sleeve arranged on a mounting mandrel of a movable carrier of a cop and sleeve transport system according to one or more of claims 1 to 5, with a thread stripping device with stripping jaws adjustable in the longitudinal direction of the mounting mandrel along the surface of the head sleeve and a hold-down device with a hold-down element for locking the head sleeve on the mounting mandrel and a control unit which detects the movement speed of the stripping jaws and, if a defined minimum speed is undershot, performs a fault correction process in which the stripping jaws are disengaged from the surface of the head sleeve, then moved within the cleaning path towards the hold-down element into an intermediate position and afterwards reapplied to the surface of the head sleeve in the intermediate position.whereupon the wiping process is restarted until the end of the cleaning section is reached, and then the wiping process is repeated as a supplementary wiping process in the area of ​​the position of the wiper jaws at the beginning of a previous troubleshooting process until the entire cleaning section is cleaned.

[0026] The device according to the invention allows for the cleaning of cops with any winding condition, including cops that, as alarm cops or cops that cannot be prepared, have a substantially complete thread winding. The control unit ensures that the cops are cleaned along the entire defined cleaning path.

[0027] Two embodiments of the method according to the invention are shown in the figures below. The figures show: Fig. 1 shows a process flow of a head cleaning without stopping the scraper jaws and Fig. 2 shows a process flow of a head cleaning with a stoppage of the scraper jaws during the cleaning process.

[0028] In Figure 1 The process steps of a coping cleaning are shown, which takes place without a standstill of the scraper jaws, whereby a standstill in a control unit is defined as a minimum speed, upon reaching which a fault rectification process is carried out.

[0029] After the cleaning process is started, the stripping jaws of the thread stripping device are positioned at the beginning of the cleaning path in a lower area of ​​the bobbin (relative to its operating position). The cleaning path extends over the length of the yarn winding of the bobbin being cleaned. Once the stripping jaws are in contact with the surface of the bobbin, they are moved towards the hold-down device, which secures the bobbin to a mounting mandrel of a movable carrier within a bobbin and bobbin transport system.

[0030] After the cylinder head is locked in place and the cleaning path is defined, the stripping process begins. This process is carried out without the stripping jaws stopping, thus avoiding any troubleshooting steps. Once the stripping process is complete, i.e., after the stripping jaws have reached the top of the cleaning path, they are lifted from the cylinder head and returned to their starting position. The cleaned cylinder head can then be transported further for use.

[0031] In the Figure 2In the described process sequence, after the start of the stripping operation, the stripping jaws come to a standstill, which is detected by a control unit. This unit then initiates a fault correction process, which first lifts the stripping jaws from the cylinder head. Subsequently, the stripping jaws are moved to an intermediate position on the cylinder head that is higher relative to their operating position, where they are then reattached to the cylinder head. After the stripping jaws are reattached, the cleaning process is restarted, and the stripping jaws reach the end of the cleaning path without any further standstill, thus completing the cleaning process.

[0032] After the cleaning process is complete, the scraper jaws are lifted from the head sleeve and returned to the position in which they came to rest at the beginning of the previous troubleshooting process. In this position, the scraper jaws are then reattached to the head sleeve, and a supplementary scraping process takes place, during which the scraper jaws are moved again to the end of the cleaning path without any further stops.

Claims

1. Method for cleaning a cop tube arranged on an arbor of a movable carrier of a cop and tube transport system, with scraper jaws of a thread scraper device which are adjustable along the surface of the cop tube in the longitudinal axis direction of the arbor, comprising the steps of: - locking the cop tube on the arbor by means of a hold-down device with a hold-down element, - placing the scraper jaws on the surface of the cop tube, - starting the scraping operation by moving the scraper jaws over a defined cleaning path along the surface of the cop tube in the direction of the upper end of the cop tube which faces the hold-down element, characterized in that during the scraping operation, the movement speed of the scraper jaws is detected and, if a defined minimum speed is undershot, a fault elimination operation is carried out, in which the scraper jaws - are brought out of engagement with the surface of the cop tube, - are subsequently adjusted within the cleaning path in the direction of the hold-down element into an intermediate position, and - are thereafter again placed on the surface of the cop tube in the intermediate position, after which the scraping operation is restarted until the end of the cleaning path is reached, and the scraping operation is repeated thereafter as a supplementary scraping operation in the region of the position of the scraper jaws at the start of a preceding fault elimination operation until the entire cleaning path is cleaned.

2. Method according to claim 1, characterized in that the supplementary scraping operation is limited to the region between the position of the scraper jaws at the start of the preceding fault elimination operation and the associated intermediate position.

3. Method according to claim 1 or 2, characterized in that the cleaning path is defined by means of a sensory, in particular optical, inspection of the cop tube.

4. Method according to one or more of the preceding claims, characterized in that the adjustment path of the scraper jaws between the position at the start of the fault elimination operation and the intermediate position is set as a function of the position of the scraper jaws in the longitudinal axis direction of the cop tube and / or the number of preceding fault elimination operations.

5. Method according to one or more of the preceding claims, characterized in that the fault elimination operation is carried out when the scraper jaws are at a standstill.

6. Device for carrying out a method for cleaning a cop tube arranged on an arbor of a movable carrier of a cop and tube transport system, according to one or more of the preceding claims, comprising - a thread scraper device with scraper jaws adjustable in the longitudinal direction of the arbor along the surface of the cop tube, and a hold-down device with a hold-down element for locking the cop tube on the arbor, and - a control unit which detects the movement speed of the scraper jaws and, if a defined minimum speed is undershot, carries out a fault elimination operation in which the scraper jaws - are brought out of engagement with the surface of the cop tube, - are subsequently adjusted within the cleaning path in the direction of the hold-down element into an intermediate position, and - are thereafter again placed on the surface of the cop tube in the intermediate position, after which the scraping operation is restarted until the end of the cleaning path is reached, and the scraping operation is repeated thereafter as a supplementary scraping operation in the region of the position of the scraper jaws at the start of a preceding fault elimination operation until the entire cleaning path is cleaned.