Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H23/00—Registering, tensioning, smoothing or guiding webs
  • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
  • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
  • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
  • B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2301/00—Handling processes for sheets or webs
  • B65H2301/40—Type of handling process
  • B65H2301/41—Winding, unwinding
  • B65H2301/414—Winding
  • B65H2301/4148—Winding slitting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
  • B65H2557/20—Calculating means; Controlling methods
  • B65H2557/264—Calculating means; Controlling methods with key characteristics based on closed loop control
  • B65H2557/2644—Calculating means; Controlling methods with key characteristics based on closed loop control characterised by PID control
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2801/00—Application field
  • B65H2801/03—Image reproduction devices
  • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

• the invention relates to a method and a device for regulating a web tension according to the preamble of claims 1, 2 and 24, respectively.
• a method for controlling the web tension is disclosed by EP 08 37 825 B1, in which, in addition to the measured actual values for the web tension, further parameters characteristic of the machine condition and process-related properties are used for the control. In addition to the currently measured voltage values, specifiable path-specific parameters also flow into the control algorithm.
• DE 198 34 725 A1 shows u. a. a method for controlling a web tension, wherein web tension actual values before and / or after the printing units of a control device is supplied, which regulates the web tension at the infeed so that despite disturbances such.
• the invention has for its object to provide a method and an apparatus for controlling a web tension.
• the achievable with the present invention consist in particular in that by means of a pre-regulation or feedforward at a predictable disturbance, in particular a roll change, expected effect on the printing process reduced, and thus the accumulated amount of waste can be minimized.
• the regulation takes place shortly before or with the occurrence of the fault on an affected unit and not after a negative effect.
• a long settling time and the risk of a web break can be reduced.
• the reduction or elimination of an effect on an expected disturbance thus accesses the disturbance itself, or proceeds without being dependent on retrospectively determined measured values at the same time as the structure of the disturbance.
• measured values for the web tension can additionally be used. This can be advantageous for optimization and / or for a self-optimizing or learning system.
• the disorder when changing substrates or their roles is counteract by means of the scheme and the accumulated amounts of waste can be minimized.
• this is achieved in that when gluing, at the section of the "old" web or entry of the beginning of a new printing material in the press pre-regulation or pre-control of drives or adjustment takes place with regard to the expected changes in web tension ,
• the pre-control or pre-regulation considerably reduces the response times of the control (cause-effect countermeasure) operating during the production and / or the time of a transient or asymptotic approximation to the desired value
• the tension is preferably at the intake train in one embodiment by a predetermined value, and in another embodiment to a specific, lowered predetermined value.
• This offset can be superimposed as a one-time amount, as discrete steps or as a continuous function within a time interval to the setpoint at the infeed station.
• the time interval can be z.
• the offset or the ramp without ramp at the relevant time in the form of a step function is abandoned.
• the actuators or the individual drives can still, for example by means of a corresponding control command, already with entry or in advance of the occurrence of the fault, z. B. the new web start in the printing press, a correction, so as to minimize the expected error or compensate.
• Fig. 1 is a schematic representation of a rotary printing machine with regulation of the web tension
• Fig. 2 is a schematic representation of the time course of a voltage without application of the method; 3 is a schematic representation of a first embodiment of the time course of the change of a setpoint value for the regulation of the voltage;
• FIG. 4 shows a schematic illustration of a second exemplary embodiment of the time profile of the change of a setpoint value for the regulation of the voltage
• Fig. 5 is a schematic representation of a third embodiment of the time course of the change of a setpoint value for the control of the voltage.
• a processing machine z. B. a web-fed rotary printing press, has along a production direction, d. H. along a path of a web 01, z. B. a printing substrate 01, in particular a paper web 01, in the transport direction T more processing stages or units.
• FIG. B. a roll changer 02, an infeed 03, one or more printing units 04; 06, a tension roller 07, possibly a longitudinal cutting device 08, Wende 09 and register devices 11, such.
• B. a longitudinal register roller 11, a further draw roller 12, z. B. as so-called.
• other processing stages not shown, such. B. coating unit, dryer, etc., be arranged.
• Each printing unit 04; 06 has one or more printing units 16; 17; 18; 19, z. B. double printing units 16; 17; 18; 19 for the two-sided printing, on, wherein the printing units 16; 17; 18; 19 can be arranged side by side or one above the other.
• the web 01 is unwound from the roll changer 02 and passes through the printing units 16; 17; 18; 19, which the web 01 successively z. B. print four times on the same page.
• the registration for double-sided printing the registration and when merging several webs 01; 01 'or partial webs 01; 01 'and the cutting across the cut register, can be checked at one or more points along the path of the web 01, the Passer- or Registerhaltmaschine.
• This is done for fully automatic printing machines, for example by means of the measurement of the position of the printing units 16; 17; 18; 19 applied marks or printed images by means of a sensor, not shown.
• the signals of the sensor are supplied in this case a control unit, not shown, for the correction of registered deviations in the register and register, whereupon z.
• adjusting means such as longitudinal register rollers, angular positions, etc. are provided.
• a control principle which operates "in retrospect” in this manner leads to a measured, already occurred deviation of an actual value from a nominal value This back to the desired setpoint by controlling drives or actuators.
• Such a control principle is z. For example, during "normal” printing, with no major fluctuations in conditions, it will respond to changes that have already occurred and are registered.
• the cause of disturbances and resulting changes can be manifold: z.
• changes in the machine state such as accelerations, changes in sizes from the printing process such as fountain solution or ink supply, changes in contact pressures, changes in the properties of the web 01 as the stress-strain behavior, the thickness, the moisture absorption, etc.
• An essential, but also foreseeable disturbance is a roll change and the associated run of a connection 26 between an old and a new web 01, in particular a splice 26 by the printing press.
• the splice 26 has a larger compared to the thickness of the single web 01 Starch, optionally plus an adhesive tape or adhesive, and of the web 01 different elastic properties.
• old and new web 01 can also have different properties (moisture, winding hardness and / or stress-strain characteristics).
• the present method of regulation now provides for the imminent change in the voltage SO; S1 counteract in such a way that a setpoint specified by the regulation SO-soll; S1-should be changed, in particular lowered.
• the setpoint is SO-soll; S1-soll should be lowered by a certain amount ⁇ S-soll compared to the "normal" setpoint SO-soll; S1-soll, and in a second example, at least temporarily, to a predefinable new setpoint value SO-fix; S1-f ⁇ x by lowering the setpoint SO-soll of the voltage SO before the first printing unit 16 by means of the feed unit 03.
• Fig. 2 shows schematically a time course z.
• the voltage S1 without the application of the method described.
• a steep rise in the voltage S1 sets in, which continues until the splice 26 enters the funnel inlet.
• the voltage S1 is at a level increased by an amount .DELTA.S1 level and degrades only slowly , and in particular with a large amplitude of the setpoint SO-soll; S1-soll deviating level in the voltages SO, S1, etc. caused by changing the strain register error between the printing units 16 to 19.
• the amount .DELTA.S-soll may in particular also be selected such that the voltage SO resulting from the change in the setpoint value SO.sub.soll after the reduction is initially below the original setpoint value SO-soll; S1-soll, and after passing through the setpoint SO-soll; S1-soll should be above the setpoint SO-soll; S1- is intended to oscillate, with the respective absolute deviation in the minimum or the maximum from the original desired value SO-soll; S1-should be significantly higher than the resulting deviation without the sag.
• the voltage SO; S1 then swings significantly reduced amplitude around the original setpoint SO-soll; S1-soll. This amount .DELTA.S- soll can z. B.
• Fig. 3 is a schematic, and parallel to the voltage SO or S1 of Fig. 2, the time course of the setpoint SO-soll applied.
• the setpoint SO-soll is lowered. This may be done in a single stage, continuously (e.g., as a ramp), or in multiple stages as shown in FIG.
• the desired value S0-soll is not lowered in one step, but in a time interval ⁇ t, which can be determined from the empirical values on the one hand and in particular by the transit time of the web 01 from the infeed 03 to the funnel inlet roller 12.
• the setpoint SO-soll which is ultimately reduced by the amount .DELTA.S-soll, can be maintained beyond the time of the maximum voltage S1 (FIG. 2) to be expected without being lowered in one embodiment by a time interval .DELTA.t '(FIG Setpoint SO-soll is then returned to the setpoint SO-soll desired for the machine state either in one step, continuously or stepwise.
• the "normal" voltage regulation then takes over again the regulation of the voltages SO;
• the desired value SO-soll is not lowered by a fixed amount ⁇ S-soll, but temporarily to a fixed, but predeterminable and / or variable new value SO-fix. This can be ensured, for example, that the voltage SO before the printing unit 04 does not drop so far that the voltage S1 behind the printing unit 04 in a critical for the web running area, z. B. below 8 daN / m, drops.
• FIG. 4 shows the time profile of the setpoint value SO-soll, which initially remains at a constant level.
• This setpoint SO-soll is now consciously lowered in the context of a foreseeable disturbance, in particular a roll change, to a fixed value SO-fix.
• the lowering can in principle be carried out at any, but fixed, point in time relative to the time of the roll change, and triggered by a wide variety of signals present or also measured by the control / regulation of the printing press.
• the lowering is fixed in the example of FIG. 4 on the bonding process (activation of the adhesive roller and / or the bladed knife), but not at the time t ⁇ of triggering the adhesive roller and / or the bladed knife, but in anticipation of sticking / cutting earlier respectively.
• the time interval At ⁇ the lowering of the nominal value is SO-to in a fixed, but adjustable time interval prior to the time t ⁇ of bonding / cutting.
• the time interval is, for example, between 50 and 400 ms, in particular 50 and 250 ms.
• the time interval .DELTA.t.sub.K By means of the selection of the time interval .DELTA.t.sub.K, an adaptation and optimization of the above-mentioned "transient response " to the printing press and the paper path can take place. Since the point in time for the lowering of the setpoint value SO-soll is before the actual time point t "for the bonding / cutting off, it is advantageous to fix the point in time for the lowering of information about the machine state or to measured values, by means of which the point in time t k for gluing / cutting is determined. This can be, for example, a determined diameter of the old, to be changed role. Also, the time for lowering may be correlated relative to a process related to gluing / clipping in direct temporal relationship.
• Such a process represents the positioning of an adhesive frame, ie, a time t s of the signal for pivoting.
• a time t s is z. B. 100 to 500 ms before the time t ⁇ for sticking / cutting, so that the lowering is about 50 to 450 ms after the time t s for panning.
• the lowering can, for example, at a certain roll diameter, z. 130 mm, and gluing / cutting at 125 mm.
• the distance between the two variables used can also be correlated with the instantaneous production speed or rotational speed (eg linear).
• the target value specification ie the target value SO target
• the target value specification is now z. B. lowered without time ramp in one step to SO-fix, and remains there for a constant, but predeterminable time interval .DELTA.t1.
• the desired value SO target along a ramp (possibly also along a step function) within a time interval .DELTA.t2 is raised again to the original desired value SO target.
• the time intervals .DELTA.t1 and .DELTA.t2 are z. B. in the same order of magnitude, for example, 0.5 * .DELTA.t1 ⁇ .DELTA.t2 ⁇ 2.0 * .DELTA.
• Fig. 1 an example of a possible control circuit for the control of the voltage SO is schematically integrated.
• the control unit 22 ensures in a conventional control circuit that the voltages SO; S1 on each of the desired setpoint SO-soll; S1-should be held. For this, actual values are SO-ist; S1-is supplied as input values, these with the setpoint values SO-soll; S1-shall be compared and provided by appropriate output values corresponding drives.
• the setpoints SO-soll; For example, S1-soll may be supplied from a machine control 24, or else quantities g supplied from the control unit 22 and characterizing the machine condition may be formed in the control unit 22 itself.
• the memory or computing unit 23 are in a development of the invention in addition to the information about the material, eg. As the paper type, and z. B. web width in addition essential, the properties or the behavior of the web 01 influencing variables g from the printing process, the machine condition and / or the web guide, such. B. dampening solution and / or ink supply, current web tension, contact pressures, speed, temperatures, accelerations and / or path of the web 01, respectively.
• the suitable temporary correction of the setpoint value SO-soll can be selected or calculated by the amount ⁇ SO for the voltage SO or the optimized time sequences (time points and time intervals ⁇ t; ⁇ t1; ⁇ t2, ⁇ t ') in the two exemplary embodiments determine or retrieve for the corresponding production.
• any other suitable method can be used for triggering the lowering of the setpoint SO-soll. For example, detecting the steep edge of one of the voltages SO; S1, an optically detected passage of the splice 26 at some point, or the definition of a time relative to the roll change in the context of a program of the machine control determine the time. However, it is important that in order to counteract the disturbance, the setpoint for the voltage is intentionally changed at least temporarily, and not only after the extent of the negative disturbance has been determined.
• the setpoint SO-soll is in contrast to the second Embodiment of the fixed value SO-fix not along a predetermined ramp, but on the basis of a measurement of the voltage S1; SO, in particular the voltage S1 behind the last printing unit 19, z. B. measured by means of the measuring roller 21, to the original setpoint SO-soll (or a new fixed setpoint SO-soll ') returned.
• a new setpoint SO-soll ' may be required, for example, if z. B. with the roll change and the paper type, ie the basic properties to be changed. This information can then, for example, taken back from the machine control and in the formation of the setpoint SO-soll; S1-soll; SO-soll 'should be considered for undisturbed operation.
• the recirculation may for example be based on continuous or discontinuous measurement value decrease, but .DELTA.t m is a valid for the next interval of time m setpoint S0-soll m determined in certain, possibly adjustable time intervals on the basis of the measured value and the control is supplied.
• a resulting step-like feedback of the setpoint value SO-soll is shown by way of example in FIG. 5.
• the feedback to the original setpoint SO-soll (or a new setpoint setpoint SO-soll ') can also be determined and specified in another way on the basis of the measured values S 1 -ist. So z. B. from two or more measured values sections of a slope of partial ramps are determined, in which case the ramp shown in Fig. 4 then in sections may have different slopes depending on the measured values.
• the determination and regulation of the setpoint values S0-soll m or the sections-wise defined gradients can be determined from the measurements in an advantageous embodiment, for. B. based on a fuzzy control, be executed in a simpler version by means of a PID controller.
• control unit control device

Landscapes

• Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
• Control Of Eletrric Generators (AREA)
• Discharge Heating (AREA)

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• 2003
  • 2003-01-22 EP EP03706245A patent/EP1472167B1/fr not_active Expired - Lifetime
  • 2003-01-22 DE DE50308253T patent/DE50308253D1/de not_active Expired - Lifetime
  • 2003-01-22 AT AT06101352T patent/ATE373618T1/de not_active IP Right Cessation
  • 2003-01-22 DE DE50304465T patent/DE50304465D1/de not_active Expired - Lifetime
  • 2003-01-22 JP JP2003565882A patent/JP4138666B2/ja not_active Expired - Fee Related
  • 2003-01-22 CN CNB038033046A patent/CN1317171C/zh not_active Expired - Fee Related
  • 2003-01-22 US US10/501,922 patent/US7191973B2/en not_active Expired - Fee Related
  • 2003-01-22 AU AU2003208270A patent/AU2003208270A1/en not_active Abandoned
  • 2003-01-22 ES ES03706245T patent/ES2266780T3/es not_active Expired - Lifetime
  • 2003-01-22 WO PCT/DE2003/000163 patent/WO2003066492A1/fr active IP Right Grant
  • 2003-01-22 AT AT03706245T patent/ATE334925T1/de not_active IP Right Cessation
  • 2003-01-22 EP EP06101352A patent/EP1657197B1/fr not_active Expired - Lifetime
  • 2003-01-22 ES ES06101352T patent/ES2290941T3/es not_active Expired - Lifetime

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