Protective device for a machine for winding and rewinding a web of material

Abstract

The invention relates to a machine (1) for winding and rewinding a web of material (M) or material sub-webs (M), preferably a paper, cardboard or tissue web, wherein the web of material (M) or material sub-webs (M) is wound onto at least one winding roller (2) and the winding roller (2) is supported and driven by at least one second support roller (4), wherein the second support roller (4) and the winding roller (2a, 2b, 2c) form a retracting nip (8) and wherein the protective device (10) comprises a retractable functional unit (11) which substantially completely covers the retracting nip (8) and in particular the second support roller (4), so that protection against retraction by the extremities of the operating personnel in a protective position (SP) of the functional unit (11) is ensured. According to the invention, the protective device (10) comprises a functional unit (11) which is accessible in the protective position (SP).

Description

[0001] The invention relates to a protective device for use in a machine for winding and rewinding a web or partial webs of material, preferably a paper, cardboard or tissue web, wherein the web or partial webs of material are wound onto at least one winding roller and the winding roller is supported and driven by at least one second support roller, wherein the second support roller and the winding roller form a retractable nip and wherein the protective device comprises a retractable functional unit which substantially completely covers the retractable nip and in particular the second support roller, so that protection against entrapment by the extremities of the operating personnel is ensured in a protective position of the functional unit.

[0002] The invention is explained below in connection with the treatment of a paper web. However, it is also applicable to other material webs that are handled similarly. These include, but are not limited to, fibrous webs made of paper, cardboard, corrugated board, or tissue.

[0003] Paper webs are produced in relatively large widths of up to over 11 meters in a paper machine. Production is virtually continuous. The direction of travel of the paper machine defines the longitudinal direction for all machines and equipment in the paper mill, and the transverse direction is defined perpendicular to it in the horizontal plane.

[0004] At the end of the paper machine, the produced paper web is wound onto a core at its full width. This core is replaced cyclically, usually during ongoing production. The resulting web-width reel is commonly referred to as a master reel or full reel.

[0005] To be manageable for a later user, such as a printing company, the paper web wound on a master roll must be cut into several parallel sections, the widths of which are suitable for the respective end user. These widths can vary considerably, so the division of the paper web is usually carried out according to a custom-defined cutting pattern.

[0006] The material webs are then wound onto rolls, which are called partial web or finished rolls, and which are issued together as a so-called roll pack. The cutting pattern can be changed from roll pack to roll pack. Strictly speaking, the slitting and winding are performed in a single machine, which is then often referred to as a roll slitting machine.

[0007] All the winding devices described above, i.e., those for producing parent rolls as well as those for producing partial or finished rolls, have in common that the web to be wound to form a winding roll creates a winding gap with at least one winding roller against which it is supported or rests, and which is accordingly referred to as a support or carrying roller. These winding rollers, which are in direct contact with the forming winding rolls, thus also represent the directly acting tools by means of which the winding quality can be influenced.

[0008] Currently, high speeds of up to 3500 m / min are achieved during winding and rewinding.

[0009] During machine operation, material webs and / or material sections may break. This can occur throughout the entire winding process of the at least one winding roller, and therefore with varying diameters. To rectify this fault, the operator must enter the stationary machine and the hazardous areas. As long as the machine is stationary, this does not pose an increased risk to the operator; however, the broken material web and / or material sections must be re-threaded between the winding roller and the support roller and manually attached or glued to the incomplete winding rollers by the operator. Since the material web and / or material sections are guided between the at least one support roller and the at least one winding roller, the support roller and the winding roller must be moved, preferably slowly.Since it is now unavoidable that the operating personnel are in the danger zone of the now moving winding roller and at least one support roller, protection against the forming inward nip must be ensured.

[0010] Document EP 1 334 305 A1 discloses a protective device that can be pivoted in from below the support roller and winding roller for a machine of the generic type for winding a web of material, which provides protection against entrapment for the operating personnel.

[0011] Documents JPH 04 122 549 U and JP 3 913 929 B2 disclose a protective barrier that pivots or retracts from below or above the support roller and winding roller for a machine of this type for winding a web of material, which is intended to prevent the operating personnel from entering the dangerous area.

[0012] The aforementioned solutions have a number of disadvantages.

[0013] For example, operators are often particularly creative when it comes to circumventing safety devices that make operation or accessibility difficult. Unfortunately, accidents, some of them fatal, still occur far too frequently because the safety devices are too easy to bypass or the danger zone is not fully secured. Often, safety precautions are circumvented because they prevent operators from quickly adjusting or repairing something on the machine, or because necessary accessible areas are not easily reachable.

[0014] The available guards often still have gaps that are too large or open, uncovered areas of the incoming nip. This is often due to the basic design of the guard, which does not allow for complete coverage of the nip. The risk of damage to the winding roller and / or support roller is also a reason to provide sufficient clearance, as these can be damaged upon contact with the guard.

[0015] The object of the invention is to provide an improved protective device for the operating personnel, which allows better access to the winding roll during use and at the same time ensures improved protection against entanglement.

[0016] Another aspect of the invention is to design the protective device in such a way that it can be easily retrofitted to existing systems without making any major changes.

[0017] The problem is solved according to the invention by a protective device according to independent claim 1, a machine comprising the protective device according to claim 8, and a method for operating the protective device according to claim 9. Further advantageous embodiments of the present invention are found in the dependent claims.

[0018] The protective device is characterized by the fact that the functional unit is accessible in the protective position.

[0019] A "tuck-in nip" is generally understood to mean a rather acute opening angle of the nip of 30° or less, in particular 20° or less, and preferably greater than 0°, since below this angle, objects can easily be sucked in when the support roller and winding roller are moving and cannot be freed again. Nips with an opening angle greater than 30°, in particular greater than 45°, and preferably greater than 90°, do not tend to suck in.

[0020] Therefore, the functional unit is designed in such a way that for each possible protective position for variable diameters, a correspondingly obtuse opening angle is set for at least one winding roller.

[0021] Furthermore, it is important for the functional unit that the smallest possible free, open gap forms between it and the winding roller, which is less than or equal to 15mm, in particular 10mm, preferably 5mm.

[0022] This means that the limbs of the operating personnel can no longer be retracted.

[0023] In an alternative embodiment, the functional unit is rigid in itself.

[0024] In an alternative embodiment, the functional unit comprises a top surface which, in the protective position, has a walkable and flat surface; preferably, the surface is also designed to be non-slip.

[0025] In an alternative embodiment, the functional unit comprises an underside which, in the protective position, is directed towards the second support roller and the underside has a curved shape corresponding to the outer contour of the second support roller.

[0026] For optimal protection, the underside of the functional unit is shaped according to the outer contour of at least one support roller, or congruent to the circular shape.

[0027] In an alternative embodiment, the functional unit has a maximum extension in the machine direction, which in the protective position covers the second support roller with a wrap angle of greater than or equal to 35°, in particular 45°, preferably 55°, and most preferably up to 90°.

[0028] In an alternative embodiment, the functional unit can be stored in a parking position in the vertical direction above the winding roller when not in use and can be lowered and retracted from above the winding roller in the direction of the retracting nip into a protective position.

[0029] In an alternative embodiment, the functional unit can be variably inserted into the protective position to accommodate different winding roller diameters.

[0030] In an alternative embodiment, the functional unit extends over the entire width in the transverse direction of the second support roller and is designed in particular as a single piece or in multiple parts.

[0031] In an alternative embodiment, the functional unit can be locked in the protective position to prevent unintentional extension.

[0032] In an alternative embodiment, the functional unit is in contact with the at least one winding roller in the protective position.

[0033] In an alternative embodiment, the functional unit comprises a deflector unit on a side facing at least one winding roller.

[0034] In an alternative embodiment, the functional unit and / or a deflector unit included in the functional unit comprises at least two contact rollers on its side facing the winding roller, preferably at least one contact roller for each provided winding roller, which are distributed in the transverse direction.

[0035] Depending on the embodiment of the functional unit in the direction of the winding roller, the contact rollers can be arranged directly on the functional unit or on the deflector unit. Preferably, the contact roller is arranged on the deflector unit.

[0036] The contact roller is preferably made of a softer plastic material, for example nylon, so that the functional unit can be moved into direct contact with the at least one winding roller without the risk of damaging the winding roller on the outer layers of the material web, since the winding roller can rotate away from underneath due to the contact rollers.

[0037] A contact or support roller is mounted on a rotatable bearing, allowing it to rotate freely around an axis. Typically, the roller itself is not driven and is only rotated by contact with a counter element, such as the winding roller or the support roller.

[0038] In an alternative embodiment, the functional unit and / or a deflector unit includes at least two sensors on a side facing at least one winding roll, preferably at least one sensor for each winding roll distributed in the transverse direction.

[0039] In a design with at least two sensors, these are ideally each positioned in a section at the respective end, transversely to the functional unit and / or deflector unit. This enables contact detection at at least both ends, as it is possible that the functional unit is not fully retracted parallel and thus exhibits a transverse position, not completely covering the retracting nip on one side and creating a hazard. A double-sided design, as described above, ensures parallel contact of the functional unit and therefore uniform transverse coverage.

[0040] The sensor is a distance sensor, in particular a distance sensor that works with light or sound, preferably a laser distance sensor or an ultrasonic sensor.

[0041] In an alternative embodiment, the functional unit comprises at least one support roller on a side facing the second support roller.

[0042] In particular, several support rollers are included, depending on the transverse extension of the carrying roller, and are arranged distributed in the transverse direction.

[0043] Preferably, two or three support rollers are arranged in a row or circumferentially in relation to the second support roller. These support rollers arranged in a row are aligned with, or, more preferably, offset transversely to, the respective front row.

[0044] In an alternative embodiment, the functional unit is supported at least at both ends in the transverse direction. However, since roll slitting machines are manufactured for material web widths of up to 11 m, additional support between the two ends may be necessary at such widths. This is because, depending on the materials used and the weight of the operator, deflection can occur when the functional unit is walked on, potentially leading to contact with the surface of the support roller. Such contact is undesirable, as it can always result in significant damage and downtime to at least one support roller, and a flawless surface is essential for winding speeds of up to 3500 m / min.

[0045] Preferably, at least one support roller should be provided, depending on the machine width, the materials used, and the maximum load during foot traffic. For example, the spacing can be increased when using a material with high flexural stiffness. As an embodiment, for machine widths of 3 m or more, at least one support roller should be provided, positioned centrally between the two ends of the functional unit. This means that support rollers should be provided at least every 1.5 m, preferably 2.0 m, starting from one end of the functional unit.

[0046] Possible materials include metals such as steel, titanium, or aluminum, which are both inexpensive and lightweight. Plastics, especially glass fiber or carbon fiber reinforced plastics, are also conceivable.

[0047] By attaching support rollers, the functional unit can be made more cost-effective and lighter at the same time.

[0048] Furthermore, a common problem with existing protective devices that can cover a support roller is that they have to be operated individually for variable diameters of the winding roller, thus creating a balance between the smallest possible gap width to the winding roller and contact with a rigid functional unit.

[0049] In an alternative embodiment, the protective device is suitable for reliably covering an incoming nip with variable winding roll diameters from at least 300 mm to a maximum of 2000 mm. Preferably with variable winding roll diameters from at least 300 mm to a maximum of 1600 mm.

[0050] Contact between a winding roller and a rigid functional unit usually results in damage to the material web on the winding roller.

[0051] Depending on the width of the nip width to be covered in the transverse direction, it is structurally advantageous to provide support points in the form of support rollers towards the support roller. These support rollers allow the functional unit to rest on the rotating second support roller below when in the retracted protective position. This prevents deflection and any potential unintended direct contact between the functional unit and the rotating support roller.

[0052] In an alternative embodiment, the protective device comprises a signaling system which is controlled depending on the at least two sensors, such that only after detection of a contact or a minimum distance of the functional unit to the winding roller is a visual and / or acoustic signal is emitted in the area of ​​the protective device in order to signal to the operating personnel located in the danger zone that a movement of the winding roller and the at least one support roller and thus a new drawing-in process of the new material web can now be started.

[0053] In an alternative embodiment, the protective device is embedded in a higher-level control and regulation system, such that the second support drum can only be driven if the at least one sensor detects a contact or a minimum distance between the functional unit and the winding roller.

[0054] In an alternative embodiment, the protective device has a driveable retraction mechanism for the functional unit.

[0055] In an alternative embodiment, the insertion mechanism comprises a first guide, in particular a second guide, and a drive.

[0056] In an alternative embodiment, the functional unit comprises at each of its two ends in the transverse direction one, preferably two, guide roller(s) which are suitable for being guided in the first guide, in particular in the second guide.

[0057] In an alternative embodiment, the drive of the functional unit comprises a cable pull system.

[0058] Furthermore, the cable pull system can be controlled via a single or dual actuator. For example, a pneumatic cylinder, a hydraulic cylinder and / or an electric drive can be used.

[0059] A further claim is a machine for winding and rewinding a material web and / or material sub-webs, preferably a paper, cardboard or tissue web, into at least one winding roll, wherein the winding roll is supported and driven by at least one second support drum, and wherein the at least second support drum and the at least one winding roll form a drawing-in nip.

[0060] The machine is characterized in that the machine comprises a protective device according to claim 1 and the protective device is arranged in a park position in the machine direction towards and, in particular, above in the vertical direction, at least one winding roller.

[0061] Alternatively, the machine can include a protective gate arranged downstream of at least one winding roller in the direction of the machine, and the protective device can be arranged upstream or downstream of the protective gate in the direction of the machine.

[0062] As a modernization solution, the present protective device is ideally suited due to its space-saving and simple design, allowing it to be retrofitted without extensive modifications to the existing machine layout.

[0063] This is possible with almost all layouts; for example, it can be positioned on an existing support or guide of a safety gate enclosed within the machine, in the direction of the machine, behind the safety gate. This allows for easy attachment or screwing of the safety device to the outside of the safety gate's support and usually requires no major modifications to the existing machine layout.

[0064] The proposed protective device can also be retrofitted in machine layouts without a separate safety gate, for example where a raised lowering platform for the winding rollers takes over the protective function during operation.

[0065] If a new machine is planned and the protective device can already be fundamentally integrated into the layout, it is also advisable to arrange the protective device in the direction of the machine immediately after the at least one winding roller, especially in front of a protective gate.

[0066] The protective device and the integrated drive system are arranged within the machine in such a way that they do not collide with the seating or other components. For example, the actuators of the cable pull system are positioned laterally outside the main machine components, and the protective device is arranged so that minimal or no intervention in the machine layout of the main components is necessary.

[0067] A further claim is made for a method for winding and rewinding a material web or material sub-webs, preferably a paper, cardboard or tissue web, to at least one winding roll, wherein the winding roll is supported and driven via at least one second support roll, and wherein the at least second support roll and the at least one winding roll form a drawing-in nip.

[0068] The method is characterized in that a functional unit of a protective device according to claim 1 is moved into contact with the at least one winding roller and after the functional unit has been moved into position a) this is locked against an automatic process in the machine direction from the protective position and b) in particular a visual and / or acoustic signal is emitted in the area of ​​the protective device, and c) only then will the at least second support roller be released for a drive by a control and regulation system.

[0069] This achieves maximum safety for the operating personnel located in the danger zone and / or on the functional unit.

[0070] The invention expressly extends to embodiments which are not given by combinations of features from explicit cross-references of the claims, whereby the disclosed features of the invention can be combined with each other - insofar as this is technically meaningful.

[0071] Corresponding elements of the embodiments shown in the figures are identified by the same reference numerals. The functions of such elements in the individual figures are identical unless otherwise described and provided this does not lead to contradictions. Therefore, a repeated description is omitted.

[0072] It should also be noted that the differing features of the illustrated embodiments can be interchanged and combined. The invention is therefore not limited to the combinations of features shown in the illustrated embodiments.

[0073] Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.

[0074] The invention will be explained below with reference to the following figures. Fig. Figure 1 shows a top view of an arrangement of a protective device in a machine for winding and rewinding a web of material. Fig. 2 shows a side view of the Fig. 1, with different operating positions of a protective device. Fig. Figures 3a-c show a protective device in park position with three different winding roller diameters. Fig. Figures 4a-c show a protective device in the protective position with three different winding roller diameters. Fig. Figures 5a-b show a detailed view of the functional unit.

[0075] The figures are shown in a common coordinate system, where MD is the machine direction or the main direction of movement of the material web, CD is the transverse direction of the material web or the machine, and z is the third axis in a right-handed coordinate system as the height direction.

[0076] L is the direction of travel of the material web, which in principle follows the machine direction, but can be deflected several times in the machine and thus can change direction in the MD-z plane, but retains the CD orientation.

[0077] The Fig. Figure 1 shows a schematic and simplified representation of a machine 1 for winding and rewinding a material web M or several material sub-webs M. The material web M is unwound from a master roll or drum by an unwinding device (not shown).

[0078] In an alternative embodiment, the material web M coming from the parent roll is cut into several material sub-webs in a longitudinal cutting device (not shown) and conveyed further.

[0079] The material web M or material webs M move in a direction L, which is indicated by directional arrows. Coming from the parent roll, the material web M is guided and deflected over at least one deflecting roller 5. Subsequently, the material web M is guided to a first support drum 3 and wound onto at least one winding core, forming at least one winding roller 2. The winding roller 2 is supported and driven by the first support drum 3 and a second support drum 4, forming at least one winding gap. In the illustrated case, the material web M is cut into six material webs and wound onto six winding cores, forming six winding rollers 2 arranged side by side in the transverse direction CD. Winding can be performed with at least one winding roller up to any number of winding rollers.In the vertical direction z, above the winding rollers 2, there is usually a pressure roller 6 which is attached to a crossbeam 7 and presses the winding rollers 2 towards the support drums 3, 4 throughout the entire winding process in order to achieve a clean winding and to minimize vibrations of the winding roller 2.

[0080] Furthermore, in the top view, a safety gate 9 is shown in the machine direction MD after the second support drum 4, which is closed during operation of the machine 1 and is moved to the height of the winding roller 2 (position safety gate 9a in Fig. 2) to prevent unintentional ejection of the winding rollers 2, for example in the event of a malfunction due to very strong vibrations, and thus to protect the operating personnel.

[0081] Following the machine direction MD further, a dashed line shows an ejected, finished winding roll 2d with maximum diameter.

[0082] Furthermore, a protective device 10 with its functional unit 11 is shown in the top view in the machine direction. The Fig. 1 the functional unit 11 in two operating positions, the parking position PP and the protective position SP.

[0083] During normal operation of machine 1, the functional unit is typically in a park position PP, which is located outside the ejection area of ​​the finished winding roll 2d. Furthermore, in this configuration, the park position PP is located downstream of the safety gate 9 in the machine direction MD. Alternatively, the park position PP can also be located upstream of the safety gate 9 in the machine direction MD.

[0084] The protective device 10 is used in the event of an unintentional material web break at the winding roller, which requires manual intervention by the operating personnel in the direct danger zone of the winding roller and support drums.

[0085] The functional unit 11 of the protective device 10 is in Fig. Figure 1 is also shown in the retracted protective position SP, where it essentially completely covers the support drum 4. It goes without saying that the functional unit 11 can only be in either the parked position PP or the protective position SP, and both positions are for illustrative purposes only.

[0086] The Fig. 2 shows a side view of the arrangement. Fig. Figure 1 shows different operating positions of the protective device 10 with the enclosed functional unit 11, the winding roller 2a, 2b, 2c, 2d and the safety gate 9a, 9b. An arrangement of the protective device 10 with the functional unit 11 in park position PP in the machine direction MD after the safety gate 9a, 9b is shown; however, it is equally conceivable that the functional unit 11 in park position PP in the machine direction MD could be arranged in front of the safety gate 9a, 9b. The functional unit 11 extends at least over the entire transverse direction CD of the second support drum 4.

[0087] The winding roller 2 typically experiences a constant increase in diameter during the winding process. Fig. Figure 2 shows four states of the winding roll 2a, 2b, 2c, 2d, where • the winding roller 2a with a minimum diameter, • the winding roller 2b with a medium diameter and • the winding roller 2c with a maximum diameter • The ejected, finished winding roll 2d with a maximum diameter corresponding to winding roll 2cim is shown in the winding process. These positions are described in the following Fig. 3a to 3c and 4a to 4c are discussed again in detail,

[0088] Following the machine direction MD further, a dashed line shows an ejected, finished winding roll 2d with maximum diameter.

[0089] In the vertical direction z, above the winding rollers 2, is a pressure roller 6, which is attached to a crossbeam 7 and presses the winding rollers 2 towards the support drums 3, 4 throughout the entire winding process to achieve clean winding and minimize vibrations of the winding roller 2. For the sake of simplicity, only the position for the winding roller 2c with maximum diameter is shown.

[0090] Furthermore, in Fig. 2 A protective gate 9a, 9b arranged in the machine direction MD after the second support drum 4 is shown, which is closed during operation of the machine 1 and is moved to the height of the winding roller 2 (position protective gate 9a) in order to prevent unintentional ejection of the winding rollers 2, for example in the event of a fault due to very strong vibrations and thus to protect the operating personnel.

[0091] For access to the winding rolls 2 in case of a malfunction, and also for the normal ejection of a finished winding roll 2d, the safety gate 9b is moved into an open position. This open position of the safety gate 9b, as well as the parking position PP of the safety device 10 with its functional unit 11, is characterized by the fact that it is necessary to be positioned above the maximum height 14 of the finished winding roll 2c in order to ensure unimpeded ejection. The maximum height 14 is in the Fig. 2 to 4c are shown as a dashed line.

[0092] Access is typically gained from a machine level 15, opposite the machine direction MD. The height z of machine level 15 can vary depending on the machine design to accommodate and transport the finished winding rolls 2d. Furthermore, if the height differs, for example, if machine level 15 is lower than the upper apex of the support rollers, an ejection lift platform (not shown) for the winding rolls may be provided before they are transported further on machine level 15.

[0093] Between the second support roller 4 and the winding rollers 2a, 2b, 2c, a retracting nip 8 typically forms, characterized by an acute opening angle. This retracting nip 8 poses a significant hazard to the operating personnel in machine 1, who, in the event of a malfunction such as a material web break, must enter the machine to reattach the torn web to the winding rollers 2a, 2b, 2c.

[0094] The protective device 10 comprises, in addition to the functional unit 10, a first guide 12 and optionally a second guide 13, which are shown as dashed lines. Both guides are attached at the two ends in the transverse direction CD of the functional unit 10 outside the maximum transverse extent CD of the material web M and preferably also outside the maximum extent of the support roller, in order to achieve a substantially complete overlap of the drawing nip 8 and the second support roller 4.

[0095] The first leadership 12a is a fixed leadership in which a first leadership role 19a ( Fig. 5a), which is located on the functional unit 11c in the front area directed towards the retracting nip 8. Or the area in protective position SP opposite the machine direction MD.

[0096] Alternatively, a second guide 12b can be provided, which can enable further stabilization when entering the protective position SP for a possible second guide roller 19b on the functional unit 11c in the rear area, i.e. the area opposite the front area in machine direction MD.

[0097] In Fig. For clarity, only the protective position SP of the functional unit 11c for a maximum winding roll diameter 2c is shown, as well as the parking position PP of the functional unit 11d as a dashed contour.

[0098] The Fig. 3a, Fig. 3b and Fig. 3c shows the side view of the Fig. 2 of the protective device 10 with its functional unit 10 in park position PP with different diameters of the winding roll 2 over the course of a normal winding process. The winding roll 2 typically experiences a constant increase in diameter during the winding process.

[0099] The protective gate 9a is shown in the closed position during normal operation.

[0100] The functional element 11d of the protective device in park position PP.

[0101] It is in Fig. 3a the winding roller 2a with a minimum diameter in the winding process for the use of the protective device 10 is shown.

[0102] It is in Fig. 3b the winding roller 2b with a medium diameter in the winding process for the use of the protective device 10 is shown.

[0103] It is in Fig. 3c the winding roller 2c with a maximum diameter in the winding process for the use of the protective device 10 is shown.

[0104] The Fig. 4a, Fig. 4b and Fig. 4c show the side view of the Fig. 2 of the protective device 10 with its functional unit 10 in retracted protective position SP with different diameters of the winding roller 2 over the course of a normal winding process. The protective position SP is usually set in the event of a fault or when it is necessary for the operating personnel to enter the danger zone near the winding rollers 2a, 2b, 2c.

[0105] The winding roll 2 typically experiences a constant increase in its diameter during the winding process.

[0106] The Fig. 4a, Fig. 4b and Fig. Figure 4c shows the functional unit 11 of the protective device 10 in the possible protective positions SP depending on the diameter of the winding roll 2a, 2b, 2c.

[0107] It is in Fig. Figure 4a shows the winding roller 2a with a minimum diameter in the winding process for the use of the protective device 10. Also shown is the functional unit 11a, retracted to the winding roller 2a in protective position SP, which is in contact with the winding roller 2a at its minimum diameter. At the minimum diameter of the winding roller 2a, the functional unit 11a has its maximum overlap with the second support roller 4 located below it.

[0108] It is in Fig. Figure 4b shows the winding roller 2b with a medium diameter in the winding process for the use of the protective device 10. Also shown is the functional unit 11b, retracted up to the winding roller 2b in protective position SP, which is in contact with the winding roller 2b having a medium diameter.

[0109] It is in Fig. Figure 4c shows the winding roller 2c with a maximum diameter in the winding process for the use of the protective device 10. Also shown is the functional unit 11c, retracted up to the winding roller 2c in protective position SP, which is in contact with the winding roller 2b having the maximum diameter.

[0110] The Fig. 5a and Fig. Figure 5b shows a detailed view of functional unit 11.

[0111] In Fig. Figure 5a shows a side view of functional unit 11.

[0112] In Fig. Figure 5b shows a top view of functional unit 11.

[0113] Both figures show the following additional elements arranged on functional unit 11.

[0114] The functional unit 11 is designed to be accessible to operating personnel, in particular one, two, three, or four operators at the same time, and has a walkable top surface 21. The surface 21 can optionally be made particularly slip-resistant to prevent slipping. This can be achieved by applying a slip-resistant coating or by specially adapting the surface structure, for example, by incorporating grooves.

[0115] Furthermore, it has a bottom surface 22 opposite the top surface 21, which is curved in a manner roughly corresponding to the second support roller contour 4 in order to enable the functional unit 11 to be positioned as close as possible to the surface of the second support roller 4.

[0116] Optionally, in the front area facing the winding roller 2, the functional unit 11 can have a deflector unit 23 which can come into contact with the winding roller 2 in order to keep the gap between the winding roller 2 and the functional unit 11 as small as possible. For example, the gap should be less than or equal to 15 mm, in particular less than or equal to 10 mm, preferably less than or equal to 5 mm, in order to minimize or prevent the risk of entrapment of the operator's extremities.

[0117] Furthermore, in the front area facing the winding roller 2, the functional unit 11 can have at least two contact rollers 17 arranged either directly or at the end of the deflector unit 23 facing the winding roller 2, distributed in the transverse direction CD. These contact rollers 17 enable the necessary further creep operation of the winding roller 2 and the support roller 4 to reconnect the material web M upon direct contact with the winding roller 2. The direct contact enables an almost completely sealed incoming nip 8 and simultaneously allows rotation of the winding roller 2 without damaging the outer layers of the material web on the winding roller 2. At least one or two contact rollers 17 can be provided per winding roller 2 in the transverse direction CD. As shown in Fig. 5a shows six contact rollers 17 arranged in the transverse direction of the CD.

[0118] At least one sensor 18 is arranged in the front area of ​​the functional unit 11 and / or on the deflector unit 23; in particular, two, three, four sensors are distributed in the transverse direction CD (as shown in...). Fig. (5b shown) Sensors 18 are arranged, preferably at least one sensor 18 per winding roll 2 in the transverse direction CD. The at least one sensor 18 can detect contact with the winding roll 2 and report it to a control system.

[0119] The sensor 18 can be a distance sensor, in particular a distance sensor operating with light or sound, preferably a laser distance sensor or an ultrasonic sensor.

[0120] The functional unit 11 comprises at least one support roller 20, in particular several support rollers 20 depending on the extent of the support roller in the transverse direction CD, on a lower surface 22 facing the second support roller 4.

[0121] Preferably, two or three support rollers 20 are arranged one behind the other in the circumferential direction of the second support roller 4 and are particularly preferably offset from each other in the transverse direction CD.

[0122] The functional unit 11 comprises at both ends in the transverse direction CD a first guide roller 19a in the front area pointing towards the winding roller 2 and optionally a second guide roller 19b in the rear area pointing away from the winding roller.

[0123] A drive system 16 can be provided to move the functional unit 11 into its protective and parking position.

[0124] For example, the drive system can be designed as a cable pull system. Furthermore, the cable pull system can be moved by one or two pneumatic or hydraulic cylinders. Reference symbol list 1 machine for winding and rewinding 2 winding rolls 2a Winding roller with minimum diameter for protective position 2b Medium diameter winding roller for protective position 2c winding roller with maximum diameter for protective position 2d ejected finished winding roll 3 first carrying drum 4 second carrying drum 5 Deflection roller 6 Pressure roller 7 Crossbar of the pressure roller 8 incoming nip between second support drum and winding roller 9 Protective Gate 10 Protective device 11 Functional unit 11a Functional unit in protective position with minimum winding roll 11b Functional unit in protective position with middle winding roller 11c Functional unit in protective position at maximum winding roll 12a first guided tour 12b second guide 14 Maximum extension of the winding roll in the z-direction 15 Machine level 16 Drive, cable pull system 17 Contact roller 18 Sensor 19a first leadership role 19b second leadership role 20 support roller 21 Top side of the functional unit 22 Underside of the functional unit 23 Deflector unit 24 Signaling system PP Parking Position SP protective position M Material track L Direction of material flow MD Machine direction CD transverse direction Z height coordinate QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 1 334 305 A1

[0010] JP 3 913 929 B2

[0011]

Claims

Protective device (10) for use in a machine (1) for winding and rewinding a material web (M) or material sub-webs (M), preferably a paper, cardboard or tissue web, wherein the material web (M) or material sub-webs (M) is wound onto at least one winding roller (2) and the winding roller (2) is supported and driven via at least one second support roller (4), wherein the second support roller (4) and the winding roller (2a, 2b, 2c) form a retracting nip (8) and wherein the protective device (10) comprises a retractable functional unit (11) which substantially completely covers the retracting nip (8) and in particular the second support roller (4), so that protection against entrapment by the extremities of the operating personnel is ensured in a protective position (SP) of the functional unit (11), characterized in that the functional unit (11) is accessible in the protective position (SP). Protective device (10) according to claim 1, wherein the functional unit (11) forms a gap of less than or equal to 15mm, in particular 10mm, preferably 5mm, to the winding roller (2). Protective device (10) according to claim 1 or 2, wherein the functional unit (11) comprises a top surface (21) which in the protective position (SP) has a walkable and flat surface (21), preferably the surface (21) is additionally designed to be non-slip. Protective device (10) according to one of the preceding claims, wherein the functional unit (11) comprises a bottom surface (22) which in the protective position (SP) is directed towards the second support roller (4) and the bottom surface (22) has a curved shape substantially corresponding to the outer contour of the second support roller (4). Protective device (10) according to one of the preceding claims, wherein the functional unit (11) has a maximum extension in the machine direction (MD) which in the protective position (SP) covers the second support roller (4) with a wrap angle of greater than or equal to 35°, in particular 45°, preferably 55°. Protective device (10) according to one of the preceding claims, wherein the functional unit (11) can be stored in a park position (PP) in the vertical direction (z) above the winding roller (2) when not in use and can be lowered and retracted from above the winding roller (2) in the direction of the retracting nip (8) into a protective position (SP). Protective device (10) according to one of the preceding claims, wherein the functional unit (11) can be locked in the protective position (SP) against unintentional extension in the machine direction (MD). Protective device (10) according to one of the preceding claims, wherein the functional unit (11) in the protective position (SP) is in contact with the at least one winding roller (2). Protective device (10) according to one of the preceding claims, wherein the functional unit (11) comprises a deflector unit (23) on a side facing at least one winding roller (2). Protective device (10) according to one of the preceding claims, wherein the functional unit (10) and / or a deflector unit (23) included in the functional unit (10) has at least two contact rollers (17) on its side facing the winding roller (2), preferably at least one contact roller (17) for each provided winding roller (2) distributed in the transverse direction (CD). Protective device (10) according to one of the preceding claims, wherein the functional unit (11) and / or a deflector unit (23) included in the functional unit (10) comprises at least two sensors (18), preferably at least one sensor (18) for each provided winding roll (2) distributed in the transverse direction (CD), on a side facing at least one winding roll (2). Protective device (10) according to one of the preceding claims, wherein the functional unit (11) comprises at least one support roller (20) on a side facing the second support roller (4), in particular several support rollers (20) are included depending on the extent of the support roller in the transverse direction (CD) and are arranged distributed in the transverse direction (CD), preferably two or three support rollers (20) are also included one behind the other in the circumferential direction of the second support roller (4) and are particularly preferably arranged offset from each other in the transverse direction (CD). Protective device (10) according to claim 10, wherein the protective device (10) has a signaling system (24) which is controlled depending on the at least two sensors (18) such that only after detection of a contact or a minimum distance of the functional unit (11) to the winding roller (2) is a visual and / or acoustic signal is emitted in the area of ​​the protective device (10) in order to signal safe entry for the operating personnel. Protective device (10) according to one of the preceding claims, wherein the protective device (10) is embedded in a higher-level control and regulation system such that the second support drum (4) can only be driven if the at least one sensor (18) detects a contact or a minimum distance of the functional unit (11) to the winding roller (2). Machine (1) for winding and rewinding a material web (M) and / or material partial webs (M), preferably a paper, cardboard or tissue web, to at least one winding roll (2), wherein the winding roll (2) is supported and driven by at least one second support drum (4), wherein the at least second support drum (4) and the at least one winding roll (2) form a retracting nip (8), characterized in that the machine (1) comprises a protective device (10) according to claim 1 and the protective device (10) is arranged in a park position (PP) in the machine direction (MD) towards and in particular above in the height direction (z) of the at least one winding roll (2). Method for winding and rewinding a material web (M) or material partial webs (M), preferably a paper, cardboard or tissue web, into at least one winding roll (2), wherein the winding roll (2) is supported and driven via at least one second support roller (4), and wherein the at least second support roller (4) and the at least one winding roll (2) form a retracting nip (8), characterized in that a functional unit (11) of a protective device (10) according to claim 1 is moved into contact with the at least one winding roll (2) and after the functional unit (11) is moved into position a) it is locked against automatic movement in the machine direction (MD) from the protective position (SP) and b) in particular a visual and / or acoustic signal is emitted in the area of ​​the protective device (10), and c) only then is the at least second support roller (4) released for a drive by a control system.

Images