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EP-4735676-A1 - METHOD FOR MONITORING AT LEAST ONE ROLLER OF A DRAFTING UNIT OF A TEXTILE MACHINE, TEXTILE MACHINE, AND USE OF A MONITORING UNIT

EP4735676A1EP 4735676 A1EP4735676 A1EP 4735676A1EP-4735676-A1

Abstract

The invention relates to a method for monitoring at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) of a drafting unit (2) of a textile machine (1), in particular at least one top roller (4a, 5a, 6a) of the drafting unit (2). According to the invention, an actual state of a roller surface (8) of the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) is detected by means of at least one non-contact detection device (9), and the actual state is compared with a desired state of the roller surface (8), wherein the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) is illuminated by at least one light source (13). The invention also relates to a textile machine (1) and to a use of a monitoring unit (15).

Inventors

  • MUELLER, JUERGEN

Assignees

  • Rieter AG

Dates

Publication Date
20260506
Application Date
20240606

Claims (19)

  1. 1. Method for monitoring at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) of a drafting system (2) of a textile machine (1), in particular at least one upper roller (4a, 5a, 6a) of the drafting system (2), characterized in that an actual state of a roller surface (8) of the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) is detected by means of at least one contactless detection device (9), and the actual state is compared with a desired state of the roller surface (8), wherein the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) is illuminated by at least one light source (13).
  2. 2. Method according to the preceding claim, characterized in that the detection device (9) detects the actual state of the roller surface (8) of a roller cover (10) of the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) and/or of a top roller (4a, 5a, 6a) following a main draft, in particular an output top roller (6a), of the drafting system (2).
  3. 3. Method according to one or more of the preceding claims, characterized in that a deviation (11) of the roller surface (8) is detected on the basis of the comparison between the actual state and the desired state, wherein the deviation (11) is preferably categorized depending on the type and/or origin, for example into a structural deviation and/or dimensional deviation.
  4. 4. Method according to one or more of the preceding claims, characterized in that the structural deviation exists, - if the actual state of surface roughness falls below or exceeds the target state, which for rollers (4a, 4b, 5a, 5b, 6a, 6b, 7) of the drafting system (2) is preferably in an RA value range between 0.4 and 1.1, - if the actual state of a depression or elevation of the roller surface (8) exceeds the desired state, which in the case of rollers (4a, 4b, 5a, 5b, 6a, 6b, 7) of the drafting system (2) is preferably at most at a depth or height of 0.3 mm, and/or - if the actual state of a surface colouring exceeds the target state, which is preferably 40% for rollers (4a, 4b, 5a, 5b, 6a, 6b, 7) of the drafting system (2).
  5. 5. Method according to one or more of the preceding claims, characterized in that the dimensional deviation exists when the actual state of a roller diameter falls below the target state, which for rollers (4a, 4b, 5a, 5b, 6a, 6b, 7) of the drafting system (2) is preferably at least 36 mm.
  6. 6. Method according to one or more of the preceding claims, characterized in that when the deviation (11) occurs, this is indicated and/or the drafting system (2) is stopped.
  7. 7. Method according to one or more of the preceding claims, characterized in that following a machine stop, in particular triggered by a fiber band sensor (12), the actual state of the roller surface (8) is checked and/or the deviation (11) is displayed.
  8. 8. Method according to one or more of the preceding claims, characterized in that the detection device (9) and/or the light source (13) is cleaned, in particular with the aid of a cleaning device (14).
  9. 9. Method according to one or more of the preceding claims, characterized in that the detection device (9) and/or the light source (13), in particular with the aid of an adjusting device (28), is brought into a detection position and/or pivoted in the detection position.
  10. 10. Textile machine (1), in particular a draw frame and/or air spinning machine and/or ring spinning machine, with a drafting system (2) having at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7), characterized in that the textile machine (1) has a monitoring unit (15) with at least one contactless detection device (9) for monitoring and with at least one light source (13) for illuminating the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7), in particular at least one top roller (4a, 5a, 6a), of the drafting system (2).
  11. 11. Textile machine (1) according to the preceding claim, characterized in that the monitoring unit (15) has a fastening section (16) which is arranged in the region of a bearing device (17) of the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) and/or a suction unit (18) of the textile machine (1).
  12. 12. Textile machine (1) according to one or more of the preceding claims, characterized in that the monitoring unit (15) is provided with a control device (19) which is designed to control the monitoring unit (15) and/or the textile machine (1) according to a method of one or more of the preceding claims 1 - 9.
  13. 13. Textile machine (1) according to one or more of the preceding claims, characterized in that the at least one detection device (9) is designed as a sensor and/or camera, wherein the at least one detection device (9) preferably has a resolution for detecting a deviation (11) with an extent of 0.1 mm 2 on the roller surface (8).
  14. 14. Textile machine (1) according to one or more of the preceding claims, characterized in that the monitoring unit (15) is arranged at least partially centrally to the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7).
  15. 15. Textile machine (1) according to one or more of the preceding claims, characterized in that a detection axis (20) of the at least one detection device (9) forms a first angle (23) with a normal plane (22) running normal to a rotation axis (21) of the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) and/or a light axis (24) of the at least one light source (13) forms a second angle (25) with the normal plane (22) of the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7), wherein the first angle (23) and/or the second angle (25) is preferably less than or equal to 30°.
  16. 16. Textile machine (1) according to one or more of the preceding claims, characterized in that the detection axis (20) and/or the light axis (24) are within a range of 5 mm to the normal plane (22) strikes the roller surface (8), wherein the normal plane (22) preferably runs substantially centrally to the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7).
  17. 17. Textile machine (1) according to one or more of the preceding claims, characterized in that the textile machine (1) comprises a display device (26) and/or a fiber band sensor (12), wherein the control device (19), the display device (26), the fiber band sensor (12) and/or the monitoring unit (15) are operatively connected to one another.
  18. 18. Use of a monitoring unit (15) for monitoring at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7) of a drafting system (2) of a textile machine (1), characterized in that the monitoring unit (15) has at least one contactless detection device (9) and at least one light source (13), wherein the monitoring unit (15) is designed to detect and/or monitor an actual state of a roller surface (8) of the at least one roller (4a, 4b, 5a, 5b, 6a, 6b, 7).
  19. 19. Use according to the preceding claim, characterized in that the monitoring unit (15) comprises at least one feature of the preceding claims.

Description

Method for monitoring at least one roller of a drafting system of a textile machine, textile machine and use of a monitoring unit The present invention relates to a method for monitoring at least one roller of a drafting system of a textile machine, in particular at least one upper roller of the drafting system. The invention further relates to a textile machine and to the use of a monitoring unit. It is known in the art to monitor a roller of a drafting system of a textile machine, in particular a drafting system, so that unwanted winding of a fiber structure, which can also be called a lap or winder, is detected. This is often done using sensing rollers that rest against the roller. However, systems are also known that monitor the lap formation on rollers using sensors. For example, WO 96/15969 A1 discloses a method and a device for detecting a thread winding (= winder) on a rotating roller of a rinsing device that is partially wrapped around by the thread. Here, a light sensor detects reflected light from a monitoring area. The disadvantage of this is that only thread windings that are already on the roller are detected. In order to minimize operational disruptions and/or damage to the textile machine or the fiber structure or the thread, an immediate reaction, such as cutting the thread, may be necessary after a thread winding has formed, which leads to a loss of production. In addition, detection and evaluation based on scattered light can be inaccurate or false detection can occur. In addition, DE 10 2021 120 188 A1 discloses a drafting system of a spinning preparation machine, comprising a plurality of drafting system rollers known. An optical monitoring device is assigned to the drafting system. The disadvantage of this is that the laps are not detected or estimated before they are created. The object of the present invention is to eliminate the disadvantages known from the prior art. The object is in particular to create a method, a textile machine and/or a use of a monitoring unit with which a winding of the fiber structure or a lap can be detected at an early stage and/or the formation of the lap can be avoided. The object is achieved by a method for monitoring at least one roller of a drafting system of a textile machine, a textile machine and a use of a monitoring unit with the features of the independent patent claims. A method is proposed for monitoring at least one roller of a drafting system of a textile machine, in particular at least one upper roller of the drafting system. The textile machine is preferably a sliver-forming textile machine, in particular a drafting system. With the help of the drafting system, at least one fiber sliver is drawn in the textile machine. This fiber sliver can then be processed further. In a textile machine designed as a drafting system, several individual fiber slivers are combined and drawn so that a fiber fleece is initially formed. The fiber fleece emerging from the drafting system is thereby more homogeneous. The fiber sliver leaves the drafting system as a fiber fleece or as a spread fiber sliver, i.e. it is thin compared to its width. After leaving the drafting system, the fiber fleece is fed to a fleece nozzle, which forms the fiber fleece back into a fiber sliver. Both the fiber fleece and the fiber sliver can be called a fiber structure. The drafting system preferably comprises three or more pairs of rollers or roller arrangements, each of which can comprise at least one lower roller and one upper roller. The lower rollers are often also referred to as cylinders. The desired drafting of the fiber structure is caused by the fact that the individual cylindrical lower rollers and thus also the individual upper rollers in contact with them have an increasingly higher peripheral speed in a transport direction of the fiber structure. This causes the fiber structure to be pulled apart in the transport direction and thus stretched. The drafting system usually has an input roller pair, a middle roller pair and/or an output roller pair. Preferably, in the proposed method, at least one of the upper rollers of the input roller pair, the middle roller pair and/or the output roller pair is monitored. According to the invention, an actual state of a roller surface of the at least one roller is detected by means of at least one contactless detection device. In addition, the actual state is compared with a target state of the roller surface. Furthermore, the at least one roller is illuminated by at least one light source. The target state is defined in this case by the fact that the at least one roller of the drafting system works essentially without errors and/or a fiber structure is produced in high quality. In addition or alternatively, the target state is defined by the fact that there is as little probability as possible of the formation of wraps or windings of the fiber structure on the at least one monitored roller. This probability is low if the roller sur