Method for operating a cleaning device for cleaning a rotating body and cleaning device for cleaning a rotating body

Abstract

The invention relates to a method for operating the cleaning device for cleaning a rotating body, in particular a rotating body of a machine applying a coating agent to a substrate, a cleaning substrate being continuously or intermittently unwound from a first roll, brought into operative contact with a lateral surface of a rotating body to be cleaned via a transport path and wound up downstream of the contact on a second roll, wherein during a cleaning process a sensor system indirectly or directly monitors the storage quantity of cleaning substrate held on the first roll to determine whether it is reaching its end or a critical residual storage quantity.In addition, for the purpose of monitoring the functionality of the sensors during the cleaning process, a qualitative or quantitative comparison is performed continuously or intermittently between a parameter correlated with the consumption of cleaning substrate, which is obtained on the one hand via the sensors and on the other hand is expected based on a previous feed of the cleaning substrate. The invention further relates to a cleaning device for cleaning a rotating body.

Description

[0001] The invention relates to a method for operating a cleaning device for cleaning a rotating body, in particular a rotating body of a machine applying a coating agent to a substrate, and to a cleaning device for cleaning a rotating body, in particular a rotating body of a machine applying a coating agent to a substrate, according to claims 1 and 10, respectively.

[0002] DE 100 44 861 A1 discloses a washing device for a cleaning device for the outer surface of a rotating cylinder. The cleaning device comprises a cleaning cloth roll from which a cleaning cloth web is unwound, guided over a pressure element, pressed against the outer surface, and finally rewound onto a dirty cloth roll. To prevent the cleaning cloth web from being completely unwound and possibly drawn into the printing unit, a switch assembly is provided. When the cleaning cloth roll reaches a minimum diameter, the switch assembly actuates an electrical switch, interrupting the electrical circuit to a motor that advances the cleaning cloth web.

[0003] With cleaning devices of this type, where the amount of residual cloth left on the cleaning cloth roll is monitored by a sensor to ensure that it falls below a minimum permissible residual quantity, i.e. a minimum amount of cleaning cloth, significant problems can arise if, for whatever reason, e.g. contamination of a non-contact distance sensor or a "sticking" of a sensor mechanism, the cloth continues to unwind without the sensor being triggered and the cleaning process or at least the further cloth feed being interrupted and / or at least a visual and / or acoustic warning signal being triggered. Such problems can range from simple damage to the cleaning device, e.g. to a pressure element pressing the cleaning cloth against the casing surface, to serious machine damage caused by the end of the cleaning cloth being pulled into the printing press.

[0004] The invention is based on the object of providing an improved method for operating a cleaning device in a printing press and a cleaning device for cleaning a rotating body of a printing press.

[0005] The object is achieved according to the invention by the features of claim 1 and 11 respectively.

[0006] The advantages achievable with the invention consist, in particular, in the fact that the cleaning device or its operation is monitored for a malfunction or error in the sensor system monitoring the washcloth supply, i.e., the monitoring of the end of the washcloth with respect to the sensor system is, for example, figuratively speaking, designed to be error-proof. In particular, the solution according to the invention monitors the intended function of the sensor system monitoring the cleaning cloth supply, or cloth sensor for short, and thus also the safe operation of the cleaning device as a whole.

[0007] The monitoring of whether the end of the washcloth or a critical remaining length has been reached can be carried out directly by monitoring the clean cloth roll for a minimum winding thickness or a value representing the minimum winding thickness, or - assuming knowledge of the cloth length and radius ratios - indirectly by monitoring the dirty cloth roll for a maximum winding thickness or a value representing the maximum winding thickness.

[0008] However, in order to prevent the above-mentioned malfunctions, the sensor's output signal is also queried during washing and a comparison is made between detected and expected changes in the remaining storage quantity.

[0009] In this case, during operation of the cleaning device for a rotating body, in particular a rotating body of a machine which applies a coating agent to a substrate, a cleaning substrate is unwound continuously or in a timed manner from a first roll, brought into operative contact with a lateral surface of a rotating body to be cleaned via a transport path and wound up downstream of the contact on a second roll, wherein during a cleaning process a sensor system directly or indirectly monitors a storage quantity of cleaning substrate held on the first roll to determine whether the end or a critical residual storage quantity has been reached.In addition, in order to monitor the function of the sensors during the cleaning process, a qualitative or quantitative comparison is carried out continuously or discontinuously between a value correlating with the consumption of cleaning substrate, which is obtained on the one hand via the sensors and on the other hand is to be expected due to a previous advance of the cleaning substrate.

[0010] Preferably, in the event of a deviation between the determined and the expected value or its course, a warning and / or an abort of the cleaning process or at least the substrate feed is issued.

[0011] As a measure for monitoring the end or the remaining residual storage quantity and / or as a measure for the quantity correlating with the consumption of cleaning substrate in the function monitoring by the sensor system, a quantity correlating with the thickness of the substrate winding on the first or second roll is preferably determined and used.

[0012] When monitoring the function of the sensors, the value to be compared is, for example, the value provided by the sensors for the residual storage quantity itself or, preferably, a change in this value that occurred in a considered interval or, if necessary, only its qualitative course, i.e. evaluated only with regard to the direction of increase, and is compared with the expected value for the value of the residual storage quantity itself or its change or the expected qualitative course, taking into account the feed rate that occurred overall or in the considered interval.

[0013] A cleaning device for cleaning a rotating body, in particular a rotating body of a machine which applies a coating agent to a substrate, which is particularly suitable for carrying out the above method, comprises a first spindle which carries or can receive a first roll formed from a web-shaped cleaning substrate, a pressing element, via which cleaning substrate unwound from the first roll is or can be guided along a transport path and by means of which it is or can be brought into operative contact with a lateral surface of the rotating body to be cleaned, and a second spindle, on which the cleaning substrate unwound from the first roll is or can be wound up into a second roll, wherein a sensor system is provided,by which a storage quantity held on the first roll occurs or can occur directly or indirectly upon reaching an end or a critical remaining storage quantity.

[0014] The sensor system is furthermore in signal connection with evaluation and / or data processing means which are set up to continuously or repeatedly carry out a qualitative or quantitative comparison between a measure of the residual storage quantity provided by the sensor system or for a change in this measure that has occurred in a considered interval with a course or value for the measure of the residual storage quantity that is to be expected, taking into account a previous advance of the cleaning substrate, or for the change to be expected in the previous interval under consideration, in order to monitor the function of the sensor system during the cleaning process.

[0015] For the comparison to be made, a functional or tabular relationship between a feed length and a measure for a residual storage quantity to be expected as a result of this or for a change in this measure to be expected as a result of a feed length in a considered interval is maintained, in particular in the evaluation and / or data processing means.

[0016] An embodiment of the invention is illustrated in the drawings and is described in more detail below.

[0017] They show: Fig. 1 an application unit using the example of a printing unit with several possible positions for the arrangement of a cleaning device; Fig. 2 a cleaning device with a cleaning cloth that can be wound from a cleaning cloth roll via a pressure element onto a dirty cloth roll and with schematically illustrated evaluation and / or data processing means for monitoring the function of a sensor system that monitors the amount of cleaning cloth.

[0018] The invention relates to the operation of a cleaning device 01 and to a cleaning device 01 with a web-shaped cleaning substrate 02, in particular a cleaning cloth 02. Such a device can be provided, for example, in an application unit 03 of a machine, e.g. a printing and / or coating machine, by means of which in particular a flat substrate, e.g. a web-shaped or in particular bar-shaped substrate, is or can be exposed to a coating agent, for cleaning the outer surface of rotating bodies 04; 06; 07 in order to free the outer surface of contaminants, e.g. by the coating agent. A flowable substance such as varnish or in particular printing ink, but in principle also, for example, fluidized powder, can be used as the coating agent. The application unit 03 can accordingly be designed as a varnishing unit or in particular a printing unit 03, e.g. a sheet-fed printing unit 03, or as another type of coating unit.

[0019] Unless explicitly differentiated, the term "web- or sheet-like substrate" refers here to flat printing materials, preferably made of paper or cardboard, but also, in principle, of plastic, corrugated cardboard, or metal. Sheet-like substrates can include not only sheets of paper or cardboard, but also panels or sheets of corrugated cardboard, plastic, glass, or metal.

[0020] An above-mentioned application unit 03 comprises, for example, at least a first rotary body 04, e.g. cylinder 04, and a second rotary body 06, e.g. cylinder 06, which form an application point 08, e.g. printing point 08, in a nip formed therebetween. The first cylinder 04 can act as an impression cylinder 04 to provide an abutment for the second cylinder 06 and / or, in the case of a sheet-shaped substrate, can act as a transport cylinder which conveys the substrate through the application point 08, which transport cylinder receives the sheet-shaped substrate upstream and delivers it downstream with respect to a production direction P, e.g. to another rotary body 09, for example a transfer cylinder 09.

[0021] In the case of a direct application process not shown here, e.g. a direct printing or varnishing process, the second rotary body 06 can be designed as a forme cylinder, which carries on its circumference the form carrying the pattern to be coated, e.g. a printing or varnishing form. For the case shown here and preferred for the design of the application unit 03 as a printing unit 03, of an application unit 03, in particular an offset printing unit 03, which operates according to an indirect application process, e.g. an indirect printing process, the second rotary body 06 is designed as a transfer cylinder 06, e.g. a blanket cylinder 06, and cooperates upstream with regard to the coating agent with a third rotary body 07, in particular a cylinder 07, which in this case is designed as a forme cylinder 07, e.g. a plate cylinder 07, and carries on its circumference the form carrying the pattern to be coated, e.g.Printing or lacquer form, often also referred to as printing or lacquer plate.

[0022] Fundamentally independent of the above-mentioned application method, the respective forme cylinder 07 receives the coating agent via a device 11 supplying the forme cylinder 07 with coating agent, e.g., an inking unit 11 or a coating system, which comprises at least one rotating body 12; 14; 13, e.g., one or more applicator or transfer rollers 14 and / or one or more distribution cylinders 13, or, in the case of a short inking or coating unit (not shown), an anilox roller. In the case of an offset printing unit 03, a dampening unit 16 can additionally be provided, e.g., also with at least one rotating body 12; 14 designed as an applicator roller 12 and optionally as a transfer roller 14.

[0023] The above-mentioned cleaning device 01 is arranged, for example, on a frame of the applicator unit 03, for example between side plates not shown here, preferably in a detachable manner. In principle, such a cleaning device 01 can be provided on the circumference of one or more of the above-mentioned rotating bodies 04; 06; 07; 12; 13; 14 for cleaning the latter, but preferably such a cleaning device 01 is provided on at least one of the cylinders 04; 06 forming the application point 08, e.g. on the above-mentioned first and / or the above-mentioned second cylinder 04; 06. In particular, in a preferred embodiment of the applicator unit 03, the above-mentioned cleaning device 01 is assigned to the transfer cylinder 06 of the applicator unit 03 operating according to an indirect method and / or, for example, independently of a direct or indirect application method, to the impression cylinder 04 of the applicator unit 03.

[0024] The cleaning cloth 02 can preferably be placed directly or indirectly against the outer surface to be cleaned by an actuator 17. The part of the cleaning cloth 02 which is effective in a contact area facing the rotating body 04; 06; 07; 12; 13; 14 to be cleaned and which comes into contact with the outer surface to be cleaned can be successively renewed during a washing process by a fresh part being unwound in a conveying direction F from a roll 21, e.g. also referred to as a cleaning cloth roll 21, which is carried e.g. on an axis 23 or shaft 23, in particular spindle 23, and is guided past the contact area and e.g. the actuator 17 which places or presses the cleaning cloth 02 directly or indirectly against the outer surface to be cleaned in the contact area, and is placed on another roll, e.g. B. on an axis 24 or shaft 24, in particular spindle 24, carried, roll 22, e.g. also referred to as dirty cloth roll 22, is rewound.This part of the cleaning cloth 02 is positioned, for example, via a pressure bar 18 that can be positioned directly or indirectly by the actuator 17. The pressure bar 18 can comprise an elastically deformable pressure element 19, e.g., a rubber membrane 19 or a rubber lip 19, which is received, for example, on or in a support, e.g., a U-profile support, that runs transversely to an adjustment direction for the pressure bar 18 and is directly or indirectly mechanically connected to the actuator 17.

[0025] The actuator 17 for actuating an above-mentioned cleaning substrate 02 is, in an advantageous embodiment, designed as a single-acting cylinder-piston system 17 with a piston and a cylinder that accommodates the piston at least over a longitudinal section. The piston can be moved, preferably pneumatically, into a working position, i.e., into a position in which the cleaning cloth 02 is or will be pressed against the outer surface, by pressurizing a working chamber located in a cylinder housing of the cylinder-piston system 17 on a pressure side of the piston, and can be brought back into a rest position, for example by at least one spring element. In principle, a pressurized fluid can be understood or used as, for example, a liquid under excess pressure compared to the environment or, preferably, a gas or gas mixture under excess pressure, in particular compressed air.

[0026] The advance of the cleaning cloth 02 can in principle be realized by any drive that effects an advance of the cleaning cloth 02 in a conveying direction F. In this case, for example, one of the rollers 21; 22, preferably the dirty cloth roll 22 or one of the spindles 23; 24 carrying the respective roller 21; 22, in particular the spindle 24 of the dirty cloth roll 22, can be driven by a - e.g. in Fig.2 only symbolically indicated - drive means 26, e.g. an electric drive motor 26, can be continuously driven or drivable. In a preferred embodiment, the drive means 26 is a drive means 26 that drives the respective spindle 23; 24 discontinuously or in a cycled manner, which is designed, for example, by a correspondingly controlled electric drive motor 26 or, in a preferred embodiment, by a cylinder-piston system 26 operable by pressure medium. In the latter case, this is in drive connection with the respective spindle 23; 24, for example, via a coupling that is non-rotatable in the feed direction and, counter to the feed direction, via a freewheel. In the case of discontinuous drive, with each stroke on the cylinder-piston system 26, the cleaning cloth 02 is pulled with a - preferably constant - feed length via the pressure element 19 onto the dirty cloth roll 22.In the opposite direction, the direction of rotation of the spindle 24 is blocked, for example, by a freewheel.

[0027] In any case, the discontinuous drive is preferably designed such that the cloth feed is constant in length per unit of time or per cycle at a constant speed of the rotating body 04; 06; 07; 12; 13; 14 to be cleaned - despite varying roll diameters. For this purpose, in the case of the cylinder-piston system 26, for example, the drivable spindle 23; 24 is assigned a mechanical feed regulator with a correspondingly varying mechanical limitation of the stroke length, which compensates for a diameter variation of the roller 21; 22 carried by the spindle 23; 24 with regard to the constant feed or cycle. Such a mechanism comprises, for example, a movable stop controlled by a cam lever that senses the diameter of the dirty cloth spindle.

[0028] In order to ensure and / or effect that the cloth feed is terminated in good time before or at the latest when the end of the cloth runs off the cleaning cloth roll, a sensor system 27 is provided, by means of which, during a cleaning process, a storage quantity of cleaning substrate 02 held on the first roll 21 is monitored directly or indirectly for reaching the end or a critical residual storage quantity, for example by detecting or being able to detect the end or a defined critical residual storage quantity, for example the residual cloth length still held on the roll 21, for example on the cleaning cloth roll 21. In this case, the sensor system 27 is at least designed to monitor the residual cloth quantity on the cleaning cloth roll 21 for the end or a threshold value φ representing the critical residual storage quantity. k to monitor, whereby upon reaching the end or the threshold value φ representing the critical remaining storage quantity ke.g., at least one warning and / or an interruption of the cleaning process or at least of the substrate feed and / or a blocking of a renewed activation of the cleaning process takes place on the relevant cleaning device 01. In this case, the sensor system 27, together with the evaluation and / or data processing means 32 evaluating the signal from the sensor system 27, acts in the manner of a limit switch, which carries out or initiates one or more of the above-mentioned measures upon reaching the criterion or signal representing the end or the critical remaining storage quantity.

[0029] In an advantageous embodiment, the sensor 27 is not only used to monitor the threshold value φ k , but also before reaching the threshold value φ kto output a dimension φ representing the currently available remaining storage quantity, i.e., the remaining cloth length still available, for the quantity representing the remaining storage quantity. The determined dimension φ, if necessary, standardized to the actual length in a length unit, can be displayed at an operating station 33 of the machine, e.g., a control station 33, as such a dimension φ or standardized accordingly as a percentage or absolute remaining length.

[0030] Although the sensor system 27 can fundamentally be implemented in different ways, it is preferably directed towards detecting a measurement φ that correlates with the thickness of the substrate winding on one of the two rolls 21; 22 or its outer diameter, preferably the cleaning cloth roll 21. The monitoring of the storage quantity on the cleaning cloth roll 21 can be carried out directly on the cleaning cloth roll 21, but also indirectly via the detection of the increasing winding thickness, i.e. the outer diameter, on the dirty cloth roll 22. The detection of the measurement φ relating to the thickness of the substrate winding can, for example, in principle be implemented using any mechanical or contactless distance measurement of a sensor scanning the outer circumference of the relevant roll 21; 22, wherein, for example,as the thickness of the substrate winding on the first or second roll 21; 22 representing the measured value φ, a measuring signal strictly correlated with the diameter of the roll 21; 22 is output by the sensor system 27 on the output side.

[0031] In a preferred embodiment here, the sensor system 27 comprises a sensor 28, e.g. a sensor lever 28, which can be pivoted about a pivot axis S, preferably running parallel to the roller axis, and which, during operation, rests on the outer circumference of the respective roller 21; 22 and / or is pre-tensioned against the outer circumference with a force, e.g. resiliently, and a sensor 29 which detects the angular position φ of the sensor lever 28 as a measured variable φ or the above-mentioned dimension φ. The sensor lever 28 acting on the circumference of the respective roller 21; 22, in particular the cleaning cloth roll 21, rotates, e.g. with a varying diameter of the roll 21; 22 a rotatably mounted shaft 31 carrying the sensing lever 28, which is in operative connection with a sensor 29 detecting the rotational angle position φ of the dimension φ for or a change in the angular position Δφ of the shaft 31.For example, a sensor 29 configured as a rotary encoder 29 or angular position encoder 29 is arranged with its rotor in a rotationally fixed manner at a front end of the shaft 31 carrying the sensor 28. Its output signal, for example via the rotational angle position φ, provides a value that is firmly correlated to the remaining winding thickness and thus to the remaining cloth length, which - e.g., appropriately standardized - can be displayed as the remaining cloth length in percent or as a length at the operating station 33.

[0032] In order to prevent incorrect operation and any associated damage that could be caused, for example, by a faulty sensor system 27, the sensor system 27 or the cleaning device 01 is monitored for a malfunction or error in the sensor system 27 monitoring the wash cloth supply. In order to monitor the function of the sensor system 27, a plausibility test is carried out continuously or discontinuously during the cleaning process using a qualitative or quantitative comparison between a value obtained via the sensor system 27 for a variable correlating with the consumption of cleaning substrate 02 and a value to be expected for this variable, taking into account a previous feed that occurred when unwinding from the clean cloth roll 21 and winding onto the dirty cloth roll 22. In the event of a deviation between the determined and the expected value or its curve for the variable in question, a warning is then preferably issued, e.g.B. by an acoustic and / or optical signal and / or a corresponding display at an operating station 33 and / or an interruption of the cleaning process or at least of the substrate feed or even a stop of the entire machine. The above-mentioned deviation should also be understood as a deviation taking into account a permissible tolerance.

[0033] As a measure φ for such a quantity to be compared, a quantity φ correlating with the thickness of the substrate winding on preferably the first or possibly the second roll 21; 22 is preferably determined and used. In this case, for function monitoring, the quantity to be compared can in principle be the measure φ supplied by the sensor system 27 for the remaining storage quantity itself, i.e. for example the measure φ correlating with the remaining storage quantity and output by the sensor system 27 or the remaining length resulting therefrom through appropriate standardization, or preferably a change Δφ in this measure φ occurring in a considered interval, i.e. for example the difference between the output signals of the sensor system 27 correlating with the remaining storage quantity or the difference in the remaining length resulting therefrom through appropriate standardization, or merely the determination of a qualitative curve sgn(φ̇), i.e. thethe direction of the change identified as increasing or decreasing course sgn(φ̇) of the determined measure φ.

[0034] This value determined by the sensor 27 is compared, for example, taking into account the feed rate that has occurred overall or in the interval under consideration, with the expected value for the value used, e.g. the expected value of the measure correlated with the storage quantity or the expected value for the change that has occurred in the interval, or merely the expected qualitative course, i.e. the course expected to be increasing or decreasing with regard to the direction of change. The interval under consideration can here and in the following, depending on the definition, be the entire interval since the start of the process or the beginning of the currently unwound roll 21, or it can be a defined immediately preceding comparison interval. The interval under consideration can be, for example,Depending on the type of drive for the cloth feed, this can also be a defined period of time, a feed effected via the defined operation of the motor or a defined number x of cycles with a known cycle feed length.

[0035] In an advantageous embodiment of the function monitoring, which is particularly easy to evaluate, the value supplied by the sensor system 27 for the measure φ representing the thickness of the substrate winding is checked continuously or repeatedly during the cleaning process for its above-mentioned qualitative curve, i.e. for a falling or rising curve, over at least one above-mentioned interval. In the case of a detection on the first roller 21, this is checked for the presence of a curve sgn(φ̇) of the measure φ representing a falling curve for the residual storage quantity, and in the case of a detection on the second roller 22, it is checked for the presence of a curve sgn(φ̇) of the measure φ representing an rising curve for the residual storage quantity. I.e.For example, it is expected that when the cleaning substrate 02 is unwound from the first roll 21 and the sensor system 27 is functioning, the residual storage quantity represented by the dimension φ decreases.

[0036] If, despite advancement, a curve is detected that remains at a constant value or deviates from the expected decreasing or increasing curve, i.e., a constant curve or a curve with a gradient that is opposite in sign, a warning is issued and / or the cleaning process or at least the substrate advance is aborted, or the entire machine is even stopped. It should be noted that, depending on the technical design of the sensor system 27 and the selection of the roll 21; 22 under consideration, the curve of the residual storage quantity on the cleaning cloth roll 21 and that of the measurement φ on which the determination is based can have the same or an opposite direction, for example, a value for the measurement φ that also decreases with the decrease in the residual storage quantity, or increases.

[0037] In an advantageous embodiment of the function monitoring with more detailed information content, a comparison is carried out continuously or intermittently during the cleaning process of the value supplied by the sensor system 27 for the dimension φ representing the thickness of the substrate winding or of a change Δφ in this dimension φ determined in the interval under consideration with a value to be expected from the previous and known feed for the dimension φ itself or for its change Δφ to be expected in the interval under consideration. The value of the dimension φ or its change Δφ and the value expected for this are evaluated to determine whether, for the known feed or the known number of cycles, the detected value has changed to an expected value for the dimension φ or by at least an expected difference value Δφ in the interval under consideration. If, for example,If a deviation between the determined and expected value for the dimension φ or for the change Δφ in the dimension φ is detected - taking into account a tolerance and / or repeating over a defined duration or number of measuring cycles - a warning and / or an abort of the cleaning process or at least of the substrate feed or even a stop of the entire machine is issued.

[0038] In a preferred embodiment with a feed cycled by the drive means 26 with, for example, a known cycle feed length, a specific change Δφ in the winding thickness or the outer roll diameter, and therefore also a specific change Δφ in the size or the dimension φ characterizing the size, is expected for a feed over a specific number x of cycles. Thus, for example, for a number x of feed cycles - for example taking into account the radius change and, if applicable, permissible tolerances - a specific change Δφ(x) for the dimension φ or the cloth length change standardized for this is expected and compared with the corresponding result from the measurement. If no difference or a difference that is too small is detected for this number X of feed cycles, one of the measures mentioned above is taken.

[0039] For carrying out the above-mentioned measures relating to the cleaning device 01 or the cloth feed, the evaluation and / or data processing means are in signal connection on the output side, for example, with a control means 34 controlling the drive means 26 of the driven spindle 23; 24.

[0040] When determining the expected value for the dimension φ or the expected change Δφ as mentioned above, the radius change occurring during unwinding or rewinding and, in the case of a clocked feed without compensating feed control, the feed length varying with the radius change are also taken into account.

[0041] For the above-mentioned monitoring of the end or a critical residual storage quantity and / or for the above-mentioned function monitoring, the sensor system 27 is in signal connection with evaluation and / or data processing means 32, which are set up to carry out the above-mentioned evaluations and the testing of courses and / or the above-mentioned comparison of values ​​for the dimension used or its change and, if necessary, via a signal connection to the drive means 26 which effects the cloth feed, depending on the result of the test or the comparison, to effect an above-mentioned measure to stop the cleaning device 01 or at least the cloth feed.

[0042] For the comparison of the above-mentioned determined and expected values ​​for the quantity used or the dimension φ itself or the comparison of determined and expected changes Δφ or differences Δφ in the values ​​for the quantity used or the dimension φ in a considered interval, a tabular or functional relationship Δφ(x) between a specific interval for the feed, e.g. in the form of a value representing a feed length or a number x of cycles with a known feed length, and an expected change Δφ of the quantity under consideration or its dimension φ, e.g. the value or the change in value of the dimension φ, is implemented or maintained in the evaluation and / or data processing means 32. Via this relationship Δφ(x), the expected result, ieDepending on the quantity under consideration, a new expected value for the measure φ, an expected change Δφ, or a qualitative course is compared with the result determined via the sensor system 27 for the quantity under consideration. List of reference symbols 01 Cleaning device 02 Cleaning substrate, cleaning cloth 03 Application unit, printing unit, coating unit, sheet-fed printing unit, offset printing unit 04 Rotational body, cylinder, impression cylinder 05 - 06 Rotary body, cylinder, transfer cylinder, blanket cylinder 07 Rotational bodies, cylinders, forme cylinders, plate cylinders 08 Application point, printing point 09 Rotational body, transfer cylinder 10 - 11 Furnishings, inking unit 12 rotating bodies, application roller 13 rotating bodies, distribution cylinders 14 rotating body, transfer roller 15 - 16 Dampening system 17 Actuator, cylinder-piston system 18 Pressure bar 19 Pressure element, rubber membrane, rubber lip 20 - 21 roll, cleaning cloth roll 22 roll, dirty cloth roll 23 Axis, shaft, spindle 24 Axis, shaft, spindle 25 - 26 Drive means, drive motor, cylinder-piston system 27 Sensor technology 28 buttons, push-button levers 29 Sensor, rotary encoder, angular position encoder 30 - 31 Wave 32 Evaluation and / or data processing tools 33 Operating station, control center 34 control means F Conveying direction P Production direction S swivel axis φ measure, measured quantity, angular position Δφ(x) relationship QUOTES CONTAINED IN THE DESCRIPTION

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

[0000] DE 100 44 861 A1

[0002]

Claims

[1] Method for operating a cleaning device (01) for cleaning a rotating body (04; 06; 07; 12; 13; 14), wherein a cleaning substrate (02) is unwound continuously or intermittently from a first roll (21), brought into operative contact with a lateral surface of a rotating body (04; 06; 07; 12; 13; 14) to be cleaned via a transport path and wound up downstream of the contact on a second roll (22), and wherein during a cleaning process a sensor system (27) directly or indirectly monitors a storage quantity of cleaning substrate (02) held on the first roll (21) for reaching the end or a critical residual storage quantity, characterized byin that, in order to monitor the function of the sensor system (27) during the cleaning process, a qualitative or quantitative comparison is carried out continuously or discontinuously between a variable correlating with the consumption of cleaning substrate (02), which is obtained on the one hand via the sensor system (27) and on the other hand is to be expected due to a previously carried out advance of the cleaning substrate (02). [2] Method according to claim 1, characterized by that in the event of a deviation between the determined and the expected value or its course, a warning and / or termination of the cleaning process or at least of the substrate feed is given and / or initiated. [3] Method according to claim 1 or 2, characterized bythat as a measure (φ) for monitoring the end or the remaining residual storage quantity and / or as a measure (φ) for the variable correlating with the consumption of cleaning substrate (02) during the function monitoring by the sensor system (27), a variable correlating with the thickness of the substrate winding on the first or second roll (21; 22) is determined and used. [4] Method according to claim 3, characterized by that when monitoring for the end or the critical remaining storage quantity as a result of reaching a value φ k for the end or the critical remaining storage amount representing threshold φ k a warning and / or an abort of the cleaning process or at least of the substrate feed and / or a blocking of a reactivation of the cleaning process on the cleaning device in question occurs. [5] Method according to claim 3 or 4, characterized bythat when monitoring the function of the sensor system (27), the value to be compared is the value (φ) supplied by the sensor system (27) for the residual storage quantity itself or a change Δφ in this value (φ) occurring in a considered interval or its qualitative course sgn(φ̇) and, taking into account the feed rate that has occurred overall or in the considered interval, a comparison is made with the expected value or the expected course for the value (φ) of the residual storage quantity itself or with the expected value for the change to be expected in the considered interval. [6] Method according to claim 3, 4 or 5, characterized byin that, for functional monitoring during the cleaning process, a value supplied by the sensor system (27) for the measure (φ) representing the thickness of the substrate winding is checked continuously or repeatedly over at least one interval or a number of cycles in the case of detection on the first roller (21) for the presence of a profile of the measure (φ) representing a falling profile sgn(φ̇) for the residual storage quantity and in the case of detection on the second roller (22) for the presence of a profile of the measure (φ) representing an increasing profile for the residual storage quantity, and as a result of a value remaining at a constant value over at least one defined interval or a profile which is the opposite of the expected profile, a warning and / or an interruption of the cleaning process or at least of the substrate feed is issued and / or initiated. [7] Method according to claim 3, 4 or 5, characterized bythat for the purpose of monitoring the function during the cleaning process, a comparison is carried out continuously or in a cyclical manner between the value supplied by the sensor system (27) for the dimension (φ) representing the thickness of the substrate winding or a change Δφ in the dimension determined in the interval under consideration and a value for this dimension to be expected from a feed that has taken place or for the change to be expected in the interval under consideration. [8] Method according to claim 7, characterized bythat the value of the dimension (φ) or its change Δφ and the expected value are evaluated to determine whether, for the known feed and / or the known number of cycles (x), the detected value has changed to an expected value or by an at least expected difference value in the interval under consideration and / or that as a result of a deviation between the determined and expected value for the dimension (φ) or for the change Δφ of the dimension (φ), in particular determined taking into account a tolerance and / or repeating over a defined duration or measuring cycles, a warning and / or an abort of the cleaning process or at least of the substrate feed is issued and / or initiated. [9] Method according to claim 3, 4, 5, 6, 7 or 8, characterized bythat a measurement signal strictly correlated with the diameter of the roll (21; 22) is output by the sensor system (27) as a variable representing the thickness of the substrate winding on the first or second roll (21; 22). [10] Method according to claim 9, characterized by that an electrical signal representing an angle of rotation (φ) of a probe (28) which can be pivoted about a pivot axis (S) and is located on the outer circumference of the roller (21; 22) in question and / or is pre-tensioned against this outer circumference is output as the measured variable (φ) and is fed to the evaluation. [11] Cleaning device for cleaning a rotating body (04; 06; 07; 12; 13; 14) with a first spindle (23) which carries or can receive a first roll (21) formed from a web-shaped cleaning substrate (02), with a pressing element (19) via which cleaning substrate (02) unwound from the first roll (21) is or can be guided along a transport path and by means of which it is or can be brought into operative contact with a lateral surface of the rotating body (04; 06; 07; 12; 13; 14) to be cleaned, and with a second spindle (24) on which the cleaning substrate (02) unwound from the first roll (21) is or can be wound up to form a second roll (22), wherein a sensor system (27) is provided by which a storage quantity held on the first roll (21) can be transferred directly or indirectly to Reaching an end or a critical remaining storage amount occurs or can occur, characterized bythat the sensor system (27) is in signal connection with evaluation and / or data processing means (32) which are set up to continuously or repeatedly carry out a qualitative or quantitative comparison between a measure (φ) supplied by the sensor system (27) for the residual storage quantity or for a change Δφ in this measure that has occurred in a considered interval, with a course or value to be expected for the measure (φ) of the residual storage quantity or for the change Δφ to be expected in the considered past interval, taking into account a previous advance of the cleaning substrate (02), in order to monitor the function of the sensor system (27) during the cleaning process. [12] Cleaning device according to claim 11, characterized bythat in the evaluation and / or data processing means (32) a functional or tabular relationship (Δφ(x)) between a feed length and a measure (φ) for a residual storage quantity to be expected thereby or for a change Δφ in this measure (φ) to be expected due to a feed length in a considered interval is maintained. [13] Device according to claim 11 or 12, characterized by that the evaluation and / or data processing means (32) are connected on the output side to a control means (34) controlling one of the spindles (23; 24) driving drive means (26). [14] Device according to claim 13, characterized by that a cylinder-piston system (26) which drives the spindle (23; 24) discontinuously and can be operated by pressure medium is provided as the drive means (26), which is in drive connection with the spindle (23; 24) via a coupling which is non-rotatable in the feed direction and counter to the feed direction via a freewheel. [15] Device according to claim 11, 12, 13 or 14, characterized by in that the sensor system (27) comprises a sensing lever (28) which is pivotable about a pivot axis (S) and which rests on the outer circumference of the roller (21; 22) in question and / or is prestressed against the outer circumference, and a sensor which detects an angular position of the sensing lever (28).

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