EP1650147B1 - Méthode pour controler le répérage d'une découpeuse dans une machine rotative d'impression - Google Patents

Méthode pour controler le répérage d'une découpeuse dans une machine rotative d'impression Download PDF

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Publication number
EP1650147B1
EP1650147B1 EP05022978A EP05022978A EP1650147B1 EP 1650147 B1 EP1650147 B1 EP 1650147B1 EP 05022978 A EP05022978 A EP 05022978A EP 05022978 A EP05022978 A EP 05022978A EP 1650147 B1 EP1650147 B1 EP 1650147B1
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EP
European Patent Office
Prior art keywords
cutting
register
printing
value
speed
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EP05022978A
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German (de)
English (en)
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EP1650147A1 (fr
Inventor
Klaus Theilacker
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Manroland AG
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Manroland AG
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    • 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
    • B65H23/1882—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 longitudinal register of web
    • B65H23/1886—Synchronising two or more webs
    • 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
    • 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 for cutting register control in a web-fed rotary printing press and to a computer program for cutting register control.
  • the DE 199 36 291 A1 describes a method for determining the cutting positions of partial webs of a longitudinally cut substrate web in a web-fed rotary printing press, in which the partial webs are brought together into strands, folded on a funnel and finally cross-cut by a knife cylinder.
  • the cut individual webs are referred to as partial webs and the sub-webs merged after the funnel as strands.
  • the determined cutting positions are used to control the cut register, with a separate control loop and additionally an external control loop for the already folded strand being provided for each partial web. This should make it possible to keep the cutting positions of all partial webs of the folded strand each at a desired value.
  • Such a control with cascade structure is complex and requires in particular the use of a large number of sensors for detecting the actual values of the cutting position on the individual partial webs and on the folded strand. This is not only costly, but with the number of sensors used also increases the probability of failure of the cut register control, as failures of automated systems are generally caused by sensor failures in the vast majority.
  • the cutting position after folding by conventional optical means can only be detected by means of a mark on the respective outer part of each strand.
  • a shift in the cutting position of the inner partial webs between the former and the knife cylinder is no longer measurable, which is why said cascade control of the cutting position of a strand based on the assumption that a post-folding occurs the cutting position in all partial webs of a folded strand has the same extent.
  • the object of the invention is to provide a method for cutting register control in a web-fed rotary printing press, by which the cut register error, i. the deviation of the cutting position from a predetermined desired value, in the simplest possible, cost-effective and reliable manner can be minimized with high accuracy.
  • a first basic embodiment of the invention is based on the finding that in a web-fed rotary printing press the contribution of the turning unit and the folding unit to the cutting register error, ie to shift the cutting position relative to its desired position, can be predicted in relation to the contribution of the remaining units of the printing machine.
  • the contribution to the cutting register error arising in the units mentioned is approximately in a fixed relationship to the contributions arising in the other units of the printing press.
  • the position of a cut register mark can be measured for the last time just before the merger to the strand at the beginning of the folding unit.
  • the cutting position of a printing material web or partial web, to which the measured value is assigned is therefore predicted on the basis of a measured value of the position of a cut register mark, in order to approximate the behavior of a fictitious control loop, in which the isfinrert forms the control difference for each web would be detected directly on the knife cylinder.
  • a preferred procedure consists of correcting the control difference of a respective cutting register control loop resulting from said measured value by adding a control correction value in the respective control loop to the control difference between the measured actual value and a predetermined setpoint of the cutting position, which is multiplied by the difference from the uncorrected control difference and a correction term derived from the current set value of the cut register setting element is calculated with a fixed correction factor.
  • Such a correction is signal processing technology very easy to carry out and therefore compared to a cutting register control in which the position of a cut register mark is controlled before the strand formation without taking into account the subsequent influence of the folding unit on the cutting position, only with a very small additional cost of operations. In particular, it does not require additional sensors for measuring the position of a cut register mark on the outer web of an already folded strand.
  • a preferred embodiment of the invention provides that the value of the correction factor depends on the ratio of the path length of the printing material web between the measuring location of the cut register mark and the location of the cross section to the path length of the printing material between the printing unit and the measuring location of the cut register mark, and preferably at least approximately corresponding to this ratio , Said path lengths are known as technical specification data for each printing press.
  • the subtraction of a correction term is used to ensure a stable behavior of the control loop despite the manipulation of the control difference.
  • the difference between the instantaneous setting value of the cut register setting element and a reference value is used as a correction term, an appropriate reference value being that setting value of the cut register setting element in which the control difference has reached the value zero for the first time after the last change of the predetermined setpoint value ,
  • This criterion for establishing the reference value can be evaluated automatically without any problem.
  • the operations for forming the correction term require only a small additional effort.
  • the printing unit in which the printing material is printed can be used by the speed of the impression cylinder is temporarily changed to adjust the cut register.
  • the method according to the invention is just as applicable to printing presses in which, for the cut register setting, setting elements of a different type are provided alone or in addition to the printing unit.
  • the invention In a printing machine, the invention generally makes it possible to compensate for an unmeasured contribution to the cut register error.
  • the cut register setting of a turning sub-web is corrected relative to that of the direct printing web originating from the same printing web on the basis of a mathematical model for the error contribution of the additional path of the turning sub-web in the turning unit. This eliminates the need for a separate measurement and control of the turning partial web, which means a considerable effort savings.
  • For the error contribution of the additional path of the turning sub-path is primarily a linear model into consideration.
  • the invention can also be used in a folding unit with several hopper levels.
  • the correction of the cut register setting of a printing material web depends on the funnel plane in which the printing material web enters the folding unit.
  • a second basic embodiment of the invention is based on the recognition that in a web-fed rotary printing press, knowing the exact cutting register error of a single printing substrate, it is possible to draw conclusions about the cutting register errors of the remaining webs from the paths of the various webs, i. that the measurement of the cutting register error of a single web predicts those of the remaining webs with a certain, in many cases sufficient, accuracy on the basis of a mathematical model.
  • the different path lengths of the individual webs as parameters, in the simplest case in the form of a linear relationship between the cut register error of the measured web and that of another, unmeasured web.
  • the particular advantage of the second basic embodiment of the invention is that it is very low effort and therefore cost feasible, since it requires only a single cutting mark sensor with associated signal processing electronics for the entire printing press, which compared to the cutting mark measurement on each track or sub-web an enormous Reduction in the scope of the sensors and the downstream signal processing electronics and thus an enormous cost savings means. It goes without saying that with the omission of a single measurement on each track, a potentially greater residual error is to be accepted. For applications with not too high accuracy requirements, the accuracy of the scheme may still be sufficient.
  • a further advantageous embodiment of the invention is based on the finding that at constant operating speed of a printing press the cutting position remains almost constant and therefore for a given speed with a static setting of the cut register, so theoretically without a cut register control, a sufficient accuracy of the cutting position can be achieved can.
  • a comparatively large dynamic cutting register error occurs during the course of the printing operation.
  • this dynamic cutting register error has a characteristic time profile for a given time course of the operating speed, which is well reproducible given otherwise constant operating parameters of the printing press.
  • a predetermined speed function describing a temporal variation of the operating speed of the printing machine proceeding from a predetermined initial value is assigned a cut register function which describes a temporal variation of another set value of the cut register.
  • the cutting register function is empirically selected such that it counteracts a change in the actual value of the cutting position as a result of the change in the operating speed.
  • the second set value is available to the cut register control for determining the first set value, so that already part of the determined control error can be compensated in advance. Consequently, according to this embodiment of the invention, only a residual error must be corrected by means of the first set value, as a result of which a faster cut register control is available.
  • the negative value of a function representing the time variation of the actual position of the cutting position from the value at the predetermined initial operating speed of the printing machine can be used as the cutting register function describes the case that a variation of the operation speed according to the predetermined speed function is performed while keeping the set value of the edit register constant.
  • Such a function can be determined by measurements, ie by changing the operating speed according to the speed function of interest for the actual operation and thereby measuring the actual value of the cutting position with constant cutting register setting by measurements, either manually on the basis of samples taken or sensorially by means of suitable marks on the printing material , For simplification, it can then be used as a cutting register function a mathematical approximation function be used for the metrologically determined course.
  • a real speed function typically starts from a phase of constant initial speed, followed successively by a constant rate increase rate, a constant speed over a variable length interval but a predetermined minimum length, and a constant rate drop rate.
  • a phase of constant final velocity generally completes the velocity function.
  • the associated cut register function has a constant first value during the constant initial phase of the speed function.
  • the constant phase of higher speed it reaches a constant second value.
  • the rising phase of the speed it has a curved course, which may contain a maximum that exceeds the constant second value in absolute value. This results from a characteristic overshoot of the cut register error observed with a linear increase in velocity in the case of a constant slice register setting.
  • the cut register function associated with the speed function described above which has a constant first value during the constant initial phase of the speed function, achieves a constant second value not only during the higher speed constant phase but also during the constant final phase of the speed, a constant third value. In the declining velocity phase between the constant second value and the constant third value, it then proceeds approximately linearly.
  • each of these adjusters may be assigned an individual cut register function to accommodate different effects of machine speed change different path guides and path lengths of the individual webs or the resulting by longitudinal section and folding partial webs and strands in the context of the possible compensate.
  • Fig. 1 a brief overview of the path of a printing material in a printing press are given, as far as it is relevant to the present invention.
  • a printing press usually has a plurality of printing units, in each of which a printing material web is printed.
  • Fig. 1 For simplicity, only the printed in the printing unit 1 web 2 after leaving the printing unit 1 is shown.
  • This web 2 is first cut longitudinally into two partial webs 3A and 3B like the webs coming from the other printing units.
  • a partial web 3B is turned in a turning unit 4, before the two partial webs 3A and 3B are brought together with other printing units, not shown partial webs to form a strand 5 and this is folded at a hopper 6.
  • the funnel 6 By folding the funnel 6, the strand 5 is rotated by 90 ° and then runs to a knife cylinder 7, where it is cross-cut into individual sections.
  • the position of the cut must be matched to the position of the printed image in order to maintain a constant, predetermined distance of the printed image from the cut edges in the longitudinal direction.
  • the web 2 or the partial webs 3A, 3B and optionally additionally the strand 5 can be guided over rollers which can be displaced transversely to the transport direction, with the aid of which the printing unit 1 to to the knife cylinder 7 to be traversed path length can be selectively varied.
  • Another possibility is to adjust the angle of rotation of the printing cylinder of the printing unit 1 to at the same Path length of the printing unit 1 to the knife cylinder 7 to move the printed image relative to the cutting position.
  • the latter has the advantage that additional cutting register adjusting elements are not required for all partial webs, but only for the partial webs turned in the turning unit 4.
  • an optical sensor 8 is arranged, which detects the position of a cutting register mark on the partial web 3A, 3B.
  • the knife cylinder 7 may be equipped with an incremental encoder which supplies a clock signal having a predetermined number of pulses and a reference pulse per revolution of the knife cylinder.
  • the number of such pulses generated since that time since the last reference pulse can be used as a measure of the position of the cut register mark.
  • Such a measured position of a cutting register mark provides a measure of the actual value of the cutting position, i. represents the expected distance of the cut from the mark and can be used to control the cut register of the respective substrate web.
  • the path of the printing material web 2 or the part webs 3A, 3B cut therefrom from the printing unit 1 to the location of the cutting register measurement by the sensor 8 is in Fig. 1 marked as L1.
  • L2 is in Fig. 1 the distance of the printing material in the form of the strand 5 from the location of the cutting register measurement by the sensor 8 to the knife cylinder 7 marked.
  • Fig. 2 in the form of a control signal flow diagram showing a single control loop.
  • a control loop is provided for each partial track 3A, 3B.
  • G1 (p) denotes the transmission behavior of the line component L1.
  • the input signal of this transfer element G1 (p) is the set value RI of the edit register.
  • the printing substrate is subject to disturbances along the line segment L1, which lead to a dynamic shift in the cutting position, in particular when the operating speed of the printing press changes. These disturbing influences are in Fig. 2 considered by the addition of a fault Z1 to the output signal of the transmission element G1 (p).
  • the superimposition of the output signal of G1 (p) and Z1 gives the measured value M for the cutting position which the optical sensor 8 arranged between the turning unit and the folding unit supplies.
  • the track share L1 is followed by the track share L1 in the folding unit.
  • G2 (p) denotes the transmission behavior of the link L2.
  • the input signal of this transmission element G2 (p) is said measured value M for the cutting position at the end of the path component L1.
  • the printing material web with the measured value M is subject to further disturbing influences along the path L2, which lead to a further dynamic displacement of the cutting position, in particular given a change in the operating speed of the printing press.
  • These further disturbances are in Fig. 2 considered by the addition of a further disturbance Z2 to the output signal of the transmission element G2 (p).
  • the result of this addition is the actual distance Y of the cut register mark from the cut on the knife cylinder 7.
  • the measured value M detected by the sensor 8 is subtracted from a setpoint value W which can be set by the printer and the control deviation D thus formed is fed to a controller having the transmission behavior R (p).
  • the position of the cut register mark on the measured substrate part web 3 with respect to the rotational angle position of the knife cylinder 7 is meant by said desired value W.
  • the rule correction value KW, after Fig. 2 is added to the control difference D is equal to zero in the previously considered conventional control loop, ie the serving for forming the control correction value KW branches of the signal flow plan after Fig. 2 do not exist there.
  • the output signal of the controller R (p) is the current set value RI of the cut register setting member formed in the example under consideration for the straight-ahead part sheet 3A by the printing unit 1 itself and for the reversing part sheet 3B by an additional adjusting member not shown in the figure is supplemented.
  • the conventional control circuit described above merely aims to maintain a correspondence of the measured value M with the target value W, so that the error of the actual distance Y between the cut register mark and the cut on the knife cylinder 7 is substantially due to the disturbance contribution Z2 of the link portion L2 is determined.
  • the route length L2 is of the same order of magnitude as the route length L1, and this also applies to the respective interference contributions Z1 and Z2, so that the effectiveness of the regulation as a whole is in need of improvement altogether.
  • the previous change ⁇ RI means the difference between the current value of RI and a reference value RB, which is the value of RI at the first coincidence of the measured value M with the desired value W after a change of the setpoint W.
  • the set value RI of the cut register must change even if the set value W is changed. However, this does not represent a response of the control loop to disturbances Z1 and Z2, and therefore, after settling to a steady state following a change in W, the new value of RI is stored as reference value RB of the cut register setting for further control.
  • FIG. 3 a schematic partial side view of a printing machine, ie an enlarged section of Fig. 1 in which details of the turning unit 4 and the folding unit can be seen, according to a first embodiment of the invention.
  • the reference numerals of Fig. 3 correspond to those of Fig. 1 , wherein only one printing unit 1 is shown, in which the printing substrate 2 is printed.
  • Two further printing material webs 12 and 22 come from other printing units, not shown, which are located to the right of the printing unit 1. Because of the basic consistency of the representation of Fig. 3 with that of Fig. 1 there is no need for a new description of it contained and already based Fig. 1 mentioned elements.
  • the printing material web 2 is cut in length on a longitudinal cutting cylinder 9 into two partial webs 3A and 3B, namely a straight-ahead part web 3A and a turning sub-web 3B.
  • the straight-ahead part track 3A runs directly into the folding unit, while the turning part track 3B is previously deflected in the turning unit 4 on schematically indicated turning bars 10 and thereby turned. It is clear that the path of the turning partial path 3B in the turning unit 4 is thereby significantly longer than that of the straight-ahead part track 3A, and that the turning partial path 3B is exposed to additional frictional forces and consequently greater elongation as a result of the deflection at the turning bars 10.
  • sensor 8 which provides a measured value M for the cutting position of the straight-ahead part track 3A.
  • Similar sensors are also provided for the straight part tracks of the other printing material webs 12 and 22, which are also cut longitudinally, but in Fig. 3 for the sake of clarity not shown.
  • the extent of the necessary correction of the cut register setting value obviously also depends on which funnel plane a printing material web or partial web enters into the folding unit, so that the funnel plane must enter into the determination of the correction.
  • the path length-dependent correction described above already implicitly takes into account the funnel plane in that the path length in the folding unit naturally depends on the funnel plane in which a printing material web or partial web enters the folding unit.
  • a correction that is specifically dependent on the funnel level can be added to a path-length-dependent correction as an additional measure if required, as well as replace it for simplification.
  • a manually adjustable correction value can be provided for each hopper level which is additively added to the setting value of the cut register of all printing material webs running across the respective hopper level.
  • the funnel plane-specific correction value could also be selected in functional dependence on the cut register settings of the printing material webs running over the respective funnel plane. In particular, it could be a linear function of the respective slice register setting.
  • Fig. 4 which exemplifies some time histories of cut register error as measured in a trial of the present invention for a typical speed profile of linear press operation of a printing machine.
  • said speed profile is shown in dashed lines and designated v. It starts from a relatively low speed, namely the set-up speed of the printing press, then increases linearly to the printing press, it remains constant for a certain time and then drops linearly down to the set-up speed.
  • the curve marked ⁇ Y0 shows the time course of the cutting register error which results in the velocity profile v, if no countermeasures are taken. It can be seen that the error increases nonlinearly during the linear velocity increase, flattening out after reaching the phase of constant print speed and also remains at least approximately constant, falls nonlinearly during the linear velocity drop, and changes to negative region approximately when the setup speed is reestablished.
  • the curve marked ⁇ Y1 shows the time course of the cutting register error which results in the velocity profile v when a conventional control with actual value measurement is applied before the folding unit without taking into account the error contribution of the folding unit.
  • the weighting factor F L2 / L1 has a value of about 0.35. It can be seen that the maximum value of the cutting register error was significantly reduced by the invention in comparison with the conventional control, namely to only about 15% of that of the control curve ⁇ Y0 that applied without regulation.
  • the curve marked ⁇ Y3 shows the time course of the cutting register error, which results in the velocity profile v, when a regulation according to the invention with actual value measurement before the folding unit and taking into account the error contribution of the folding unit by correction with a wrong weighting factor F is applied.
  • the weighting factor F corresponds to the curve .DELTA.Y3 not the ratio L2 / L1 of the path portions L2 and L1 of the printing substrate in the printing press, but is significantly larger than this ratio, namely twice as large.
  • This means that the curve ⁇ Y3 is the result of an incorrect parameterization of the control loop Fig. 2 illustrated. In this case, in comparison with the operation without regulation, a maximum value of the cut register error of approximately -50%, which is lower in absolute value than the value achieved with a conventional control at the curve ⁇ Y1, results.
  • the application of the method according to the invention to the folding unit in comparison to a conventional cutting register control without consideration of the folding unit requires only a small additional effort, which is predominantly in the field of programming in a digital realization of the control loop.
  • the application of the invention to the turning unit provides even compared to a conventional cut-off register control in which are measured at all sub-webs Thomasregistermarken, a considerable effort reduction.
  • Fig. 5 shows a schematic partial side view of a printing press according to a second embodiment of the invention, which is largely similar to the in Fig. 3 corresponds to a first description of the contained therein and already based Fig. 3 mentioned elements are superfluous and only the differences need to be explained.
  • the reference numerals of Fig. 5 as far as possible correspond to those of Fig. 3 ,
  • the measured brand position can only be used directly as an actual value for the regulation of the cutting register of this partial web 3B the cutting position can be used.
  • the section register error of each other partial path can be determined in a simple manner from the section register error measured with the aid of the sensor 8 'on the outer partial path 3B linear relationship, predict.
  • the cut register error of the other web part 3A cut from the same web 2 is smaller since its path is shorter while the errors of all the other part webs are larger since the webs 12 and 22 from which these part webs are cut are farther from, in Fig. 5 not shown printing units and thus have a longer path, provided that the distance of the other printing units of the printing unit 1 is greater than the additional path portion of the turning partial web 3 B relative to the straight-ahead part of the sheet 3A.
  • the reduction of the cut register sensor to only a single sensor 8 'on the knife cylinder 7 provides an enormous amount of hardware expenditure, while the mathematical modeling of the dependence of the cut register error of the unmeasured sub-webs from that measured by the single sensor 8' on the sub-web 3B Error purely in the field of software and therefore can also be easily adapted to different types of printing presses.
  • the embodiment according to Fig. 5 is therefore of particular interest for applications where less accuracy is required, but low cost.
  • Fig. 6 shows a speed course from the set-up operation over the production run until the printing machine is shut down.
  • a press In setup mode, a press usually runs at a relatively low speed to attack To keep paper waste low. Once the machine has been set up, the speed is increased to the machine's production speed, which increase can not be instantaneous, but occurs continuously with a usually constant rate of increase fixed by the electronic control of the machine.
  • This time course of the operating speed of a printing press is in Fig. 6 the dashed curve 23 again, wherein the phase of constant Einricht Bulgaria with A and the phase linear velocity increase with B is characterized.
  • the scaling of both axes is in Fig. 6 linear.
  • phase C If the printing speed is reached, it is maintained in a phase C until an intended number of printed products is produced.
  • This phase C is in Fig. 6 shown greatly shortened compared to the real printing operation.
  • the speed in a phase D is again reduced with a constant rate of decay fixedly determined by the electronic control of the machine until a predetermined final speed, which usually corresponds to the set-up speed, and thus the last operating phase E is reached.
  • the result is a cut register error, ie, a deviation of the cut position from its setpoint, such as curve 24 in FIG Fig. 6 shows. Also with regard to the edit register, the scaling is in Fig. 6 linear.
  • the cut register error is almost zero, ie only slight fluctuations of the curve 24 near the zero position can be detected in phase A.
  • the cut register error increases sharply, its time course being clearly nonlinear and significantly flattening as the rise time increases despite the rate of increase in the rate being constant.
  • phase C At the transition of the velocity increase to the constant pressure velocity phase C, the cut register error decreases almost abruptly to a certain extent below the value reached at the end of phase B and then remains during phase C apart from minor variations comparable to those of phase A, almost constant.
  • phase C is in Fig. 6 shown greatly shortened, but in view of the approximate constancy of the cutting register error in this phase for the understanding of the invention does not matter.
  • phase D If the speed in phase D is reduced starting from the constant value of phase C at a constant decay rate, then the clipping register error also drops, but not vice versa to its course in the speed increase, but much faster. In this case, even the zero line is exceeded and the cut register error reaches at the end of the phase D a negative value, which is in the same order of magnitude as the approximately constant positive value in the phase C. In a first approximation, the profile of the cutting register error in the phase D as be viewed linearly.
  • the basic idea of the invention is based on the fact that the cutting register error, which was set to zero by the operator of the machine in phase A, can be compensated for, ie kept at a value of zero, during the passage of a predetermined time course Machine speed, the cut register setting is selectively varied, in accordance with the negative value of previously empirically determined curve 24. This reflection of the curve 24 on the time axis is in Fig. 6 shown as curve 25.
  • the curve 24 is undoubtedly subject to certain stochastic fluctuations, it would not make sense to actually use the negative measured curve 25 to compensate for the cut register error. Rather, the curve 25 can be described relatively accurately with a mathematical approximation function, and this must likewise be defined in sections according to the subdivision of the curves 23 and 24 into clearly distinguishable sections.
  • Fig. 6 If such an approximation function is shown by way of example as a curve 26.
  • This approximation function 26 is zero in phase A, has a curved course in phase B and at the beginning of phase C, which has an absolute maximum within phase B. It can be approximated by a cubic polynomial, for example, with good accuracy.
  • phase C In the course of phase C, it goes into a constant value, which lasts relatively long in real printing operation compared to the curved initial region of this phase.
  • phase D the approximation function 26 is linear, changing the sign.
  • At the beginning of phase E it returns to a constant value, which is maintained as long as necessary.
  • Fig. 6 some guideline values for parameters for characterizing curve 26 are given by way of example.
  • the time period from the beginning of phase B to the absolute value maximum is about 50-80% of the total duration of phase B.
  • the transition range at the beginning of phase C until a constant value is reached takes about 10-30% of the length of phase B.
  • the magnitude of the magnitude maximum in phase B is approximately 100-150% of the constant value reached during phase C.
  • the magnitude of the constant end value with reversed sign in phase E is in the range of 50-300% of the constant value reached during phase C.
  • the range in which the slope of the curve 26 lies within the phase D is clear from the other parameters.
  • the compensation curve 26 is for the phases of start-up B, run-out C and run-out D in Fig. 7 again shown alone.
  • the compensation curve 26 can be completely described by a total of five parameters. These are the position of the amount maximum in phase B as part b1 of the total startup time B, the duration of the transition in the B phase.
  • Phase C as proportion c1 of the total printing time C, the value S of the cutting register setting in the stationary region of the printing time C, the ratio b2 of the height of the maximum amount of the cutting register setting in the phase B to the value S, and the ratio d2 of the final value of the cutting register setting at the end of the Phase D to value S.
  • the printer determines by control measurements during the printing operation that the compensation effect in one or more phases is insufficient, ie that an impermissibly large cut register error occurs at the compensation curve 26 specified at the beginning of the printing operation, then it can use one or more of the parameters b1, c1, Change S, b2 and d2 by manual intervention.
  • This change acts directly on the current printing operation and is stored for the next run of the printing press as a new waveform of the compensation curve 11.
  • the shape of the compensation curve 11 can, if necessary, track slow changes over time in the behavior of the printing press, ie a long-term drift of the dynamic cut register error.
  • the duration of the setup phase A and the duration of the final phase E are arbitrary, because the compensation begins only with the entry into the phase B and after the end of the phase D, the cut register setting d2xS reached there is no longer changed.
  • the method according to the invention can also be used if a printing machine is to be operated optionally with different rates of increase and decrease of the speed and / or with different speeds of production.
  • an associated compensation function 26 for each possible speed curve 23, an associated compensation function 26 must be stored or the existing one spread differently.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (28)

  1. Procédé de régulation du repère de coupe d'une machine d'impression rotative à bobines dont les bandes imprimées sont rassemblées en au moins une nappe et cette nappe est pliée et après pliage, elle est coupée transversalement, et
    avant la réunion des bandes imprimées pour former au moins une nappe, on mesure les positions des repères de coupe, imprimés, et on les utilise dans des boucles de régulation comme mesure de la valeur réelle de la longueur de coupe pour la régulation des repères de coupe, procédé caractérisé en ce que
    lorsqu'on détermine une première valeur de réglage (RI) d'un élément de réglage de repères de coupe associé à une bande imprimée (2, 3A, 3B), on corrige sur la base d'un modèle mathématique pour la composante d'erreur de la partie non saisie par la mesure de la valeur réelle de la course de la bande imprimée (2, 3A, 3B) dans la machine d'impression, la première valeur de réglage qui serait nécessaire pour avoir une différence de régulation (D) égale à zéro entre une mesure réelle (M), associée à la bande imprimée (2, 3A, 3B) respective et une valeur de consigne (W) prédéfinie de la position de coupe,
    la correction étant faite pour que la composante d'erreur soit au moins sensiblement compensée.
  2. Procédé de régulation du repère de coupe selon la revendication 1,
    caractérisé en ce que
    le modèle mathématique applique une relation linéaire entre la composante d'erreur de la partie du trajet de la bande imprimée (2, 3A, 3B) dans la machine d'impression, partie non contenue dans la mesure réelle et la différence de régulation (D) entre la mesure réelle (M), mesurée, associée à la bande imprimée (2, 3A, 3B), et une valeur de consigne (W) prédéfinie.
  3. Procédé de régulation du repère de coupe selon la revendication 1 ou 2,
    caractérisé en ce que
    dans les circuits de régulation, chaque fois pour la différence de régulation (D) entre la valeur réelle (M) mesurée de la bande imprimée (2, 3A, 3B) et la valeur de consigne prédéfinie (W) de la position de coupe, on calcule une valeur de correction de régulation (KW) que l'on ajoute, et qui résulte de la multiplication par un coefficient de correction (F), fixe, de la différence entre la différence de régulation (D) non corrigée et une première valeur de réglage (RI) du terme de correction ((ΔRI) déduit de l'élément de réglage de repère de coupe.
  4. Procédé de régulation du repère de coupe selon la revendication 3,
    caractérisé en ce que
    la valeur du coefficient de correction (F) dépend du rapport (L2/L1) de la longueur de trajet (L2) de la matière imprimée (2, 3A, 3B, 5) entre le point de mesure du repère de coupe et l'emplacement de la coupe transversale par rapport à la longueur de trajet (L1) de la matière imprimée (2, 3A, 3B, 5) entre l'unité d'impression (1) et l'emplacement de mesure du repère de coupe.
  5. Procédé de régulation du repère de coupe selon la revendication 4,
    caractérisé en ce que
    le coefficient de correction (F) entre sensiblement le rapport (L2/L1) de la longueur de trajet (L2) de la matière imprimée (2, 3A, 3B, 5) de l'emplacement de mesure du repère de coupe à l'emplacement de la coupe transversale, par rapport à la longueur de trajet (L1) de la matière imprimée (2, 3A, 3B, 5) entre l'unité d'impression (1) et l'emplacement de mesure, correspond au repère de coupe.
  6. Procédé de régulation du repère de coupe selon l'une des revendications 3 à 5,
    caractérisé en ce que
    le terme de correction (ΔRI) est la différence entre la première valeur de réglage instantanée (RI) de l'élément de réglage du repère de coupe et une valeur de référence (RB).
  7. Procédé de régulation du repère de coupe selon la revendication 6,
    caractérisé en ce que
    la valeur de référence (RB) est la première valeur de réglage (RI) de l'élément de réglage du repère de coupe pour laquelle, après la dernière variation de la valeur de consigne prédéfinie (W), la différence de régulation (D) atteint pour la première fois la valeur nulle.
  8. Procédé de régulation du repère de coupe selon l'une des revendications 1 à 7,
    caractérisé en ce que
    l'unité d'impression (1) qui imprime la bande (2, 3A, 3B, 5) est utilisée comme élément de réglage du repère de coupe en ce que pour régler le repère de coupe, on modifie de temps en temps la vitesse de rotation des cylindres d'impression.
  9. Procédé de régulation du repère de coupe selon la revendication 8,
    caractérisé en ce que
    pour une variation de la vitesse de rotation des cylindres d'impression d'une unité d'impression (1), on modifie en même temps la vitesse de rotation des cylindres entraînés de tous les points de pincement suivants de la bande imprimée (2, 3A, 3B) provenant de cette unité d'impression (1) de façon à avoir partout la même variation de vitesse périphérique.
  10. Procédé de régulation du repère de coupe selon l'une des revendications 1 à 9,
    caractérisé en ce que
    les bandes imprimées (2) sont coupées longitudinalement en parties de bandes (3A, 3B) qui sont retournées au moins en partie dans une unité de retournement (4) avant d'être réunies pour former au moins une nappe (5), et
    le réglage du repère de coupe d'une partie de bande (3B), retournée, est corrigé par rapport à la partie de bande (3A) non retournée, provenant de la même bande imprimée (2), selon un modèle mathématique pour la composante d'erreur correspondant à la course supplémentaire parcourue par la partie de bande (3B), retournée, dans l'unité de retournement (4).
  11. Procédé de régulation du repère de coupe selon la revendication 10,
    caractérisé en ce que
    le modèle mathématique de la composante d'erreur de la course supplémentaire de la partie de bande (3B) retournée dans l'unité de retournement (4), correspond à une relation linéaire entre cette composante d'erreur et la composante d'erreur de la course de la partie de bande (3A) non retournée, entre l'emplacement de la coupe longitudinale et l'emplacement de mesure des repères de coupe sur la partie de bande (3A) non retournée.
  12. Procédé de régulation du repère de coupe selon l'une des revendications 1 à 11,
    caractérisé en ce que
    dans le cas d'une unité de pliage à plusieurs niveaux de cônes de pliage (6), la première valeur de réglage (RI) d'un élément de réglage du repère de coupe associé à une bande imprimée (2, 3A, 3B) est corrigée en fonction du niveau des cônes de pliage dans lequel la bande imprimée (2, 3A, 3B) entre dans l'unité de pliage.
  13. Procédé de régulation du repère de coupe dans une machine d'impression rotative à bobines dans laquelle les bandes imprimées sont réunies pour former au moins une nappe et cette nappe est pliée puis coupée transversalement après le pliage, et
    après la réunion des bandes imprimées en au moins une nappe, on mesure la position d'au moins un repère de coupe, imprimé, et on l'utilise dans au moins un circuit de régulation comme mesure de la valeur réelle de la position de coupe pour assurer la régulation du repère de coupe,
    procédé caractérisé en ce qu'
    on utilise la position mesurée du repère servant à la régulation du repère de coupe de la bande imprimée sur laquelle se trouve le repère imprimé, directement comme valeur réelle de la position de coupe, et pour la régulation du repère de coupe des autres bandes imprimées, on calcule la valeur réelle de la position de coupe de la bande respective à partir de la position mesurée des repères en s'appuyant sur un modèle mathématique tenant compte de la différence de parcours des différents trajets dans la machine d'impression.
  14. Procédé de régulation du repère de coupe selon la revendication 13,
    caractérisé en ce que
    dans le modèle mathématique, on introduit comme paramètre, les différentes longueurs des trajets des différentes bandes dans la machine d'impression.
  15. Procédé de régulation du repère de coupe selon la revendication 14,
    caractérisé en ce que
    le modèle mathématique correspond à une relation linéaire entre la position mesurée des repères et la valeur réelle respectivement calculée de la position de coupe de l'une des autres bandes dans lesquelles intervient la longueur du trajet de la bande respective portant l'impression du repère et l'autre bande respective, dans la machine d'impression.
  16. Procédé de régulation du repère de coupe selon l'une des revendications 13 à 15,
    caractérisé en ce que
    l'unité d'impression (1) dans laquelle on imprime la bande (2, 3A, 3B, 5) est utilisée comme élément de réglage du repère de coupe en ce qu'on modifie de temps en temps la vitesse de rotation des cylindres d'impression pour déplacer le repère de coupe.
  17. Procédé de régulation du repère de coupe selon la revendication 16,
    caractérisé en ce que
    lorsqu'on modifie la vitesse de rotation des cylindres d'impression d'une unité d'impression (1), on modifie en même temps la vitesse de rotation des cylindres entraînés de tous les points de pincement suivants, de la bande imprimée (2, 3A, 3B) venant de cette unité d'impression pour avoir partout la même variation de la vitesse périphérique.
  18. Procédé de régulation du repère de coupe selon l'une des revendications 13 à 17,
    caractérisé en ce que
    dans le cas d'une unité de pliage comportant dans plusieurs niveaux, des cônes de pliage (6), la première valeur de réglage d'un élément de réglage du repère de coupe associé à une bande imprimée (2, 3A, 3B), est corrigée en fonction du niveau des cônes de pliage dans lequel la bande de matière imprimée (2, 3A, 3B), entre dans l'unité de pliage.
  19. Procédé de régulation du repère de coupe selon l'une des revendications précédentes,
    caractérisé en ce qu'
    à une fonction de vitesse prédéfinie (23) qui décrit une variation dans le temps de la vitesse de fonctionnement de la machine d'impression à partir d'une valeur initiale prédéfinie, on associe une fonction de repère de coupe (26) décrivant une variation dans le temps d'une seconde valeur de réglage du repère de coupe, et
    dans le cas d'une variation de la vitesse de fonctionnement de la machine d'impression selon une fonction de vitesse prédéfinie (23), on modifie la seconde valeur de réglage du repère de coupe, en continu, de manière synchrone selon la fonction de repère de coupe (26), associée, la fonction de repère de coupe (26) étant choisie empiriquement pour qu'elle s'oppose à une variation de la valeur réelle de la position de coupe liée à la variation de la vitesse de fonctionnement.
  20. Procédé de régulation du repère de coupe selon la revendication 19,
    caractérisé en ce que
    comme fonction de repère de coupe (26), on utilise la valeur négative d'une fonction représentant la variation dans le temps de la valeur réelle de la position de coupe par rapport à la valeur correspondant à la valeur initiale prédéfinie de la vitesse de fonctionnement de la machine d'impression dans le cas où une variation de la vitesse de fonctionnement se fait selon la fonction de vitesse (23), prédéfinie, en maintenant constante la seconde valeur de réglage du repère de coupe.
  21. Procédé de régulation du repère de coupe selon la revendication 20,
    caractérisé en ce que
    la fonction de repère de coupe (26) est une fonction mathématique approchée d'une fonction (25) obtenue par des mesures.
  22. Procédé de régulation du repère de coupe selon la revendication 21,
    caractérisé en ce qu'
    au moins une partie des paramètres de la fonction approchée (26), est enregistrée dans une mémoire qui peut être affichée et peut être modifiée manuellement.
  23. Procédé de régulation du repère de coupe selon l'une des revendications 19 à 22,
    caractérisé en ce que
    la fonction de vitesse (23), est subdivisée en différents segments caractéristiques auxquels sont associés des segments caractéristiques de la fonction de repère de coupe (26).
  24. Procédé de régulation du repère de coupe selon la revendication 23,
    caractérisé en ce que
    la fonction de vitesse (23) commence par une phase (A) à vitesse initiale constante suivie par une montée (B) de la vitesse suivant une pente constante, puis une vitesse constante dans un intervalle (C) de longueur variable, mais de longueur minimale prédéfinie et une descente (D) de la vitesse à pente constante et une phase (E) de vitesse finale constante.
  25. Procédé de régulation du repère de coupe selon la revendication 24,
    caractérisé en ce que
    la fonction de repère de coupe (26) a une première valeur constante pendant la phase initiale constante (A) de la fonction de vitesse (23), et pendant la phase constante (C), elle atteint une vitesse plus élevée pour une seconde valeur constante, et
    dans la phase de montée (B), la vitesse a un tracé qui correspond à une seconde valeur constante dont l'amplitude dépasse un maximum.
  26. Procédé de régulation du repère de coupe selon la revendication 24 ou 25,
    caractérisé en ce que
    la fonction de repère de coupe (26) a une première valeur constante pendant la phase initiale constante (A) de la fonction de vitesse (23), et pendant la phase constante (C), elle a une seconde valeur constante supérieure à la première vitesse et pendant la phase finale constante (E) à une troisième valeur constante et dans la phase (D) de vitesse décroissante, le tracé est pratiquement linéaire.
  27. Procédé de régulation du repère de coupe selon l'une des revendications 19 à 26,
    caractérisé en ce qu'
    une fonction de repère de coupe (26), individuelle, est associée à chaque organe de réglage de la machine d'impression servant au réglage du repère de coupe.
  28. Procédé de régulation du repère de coupe selon l'une des revendications 19 à 27,
    caractérisé en ce que
    la seconde valeur de réglage du repère de coupe, est la base du calcul de la première valeur de réglage.
EP05022978A 2004-10-23 2005-10-21 Méthode pour controler le répérage d'une découpeuse dans une machine rotative d'impression Not-in-force EP1650147B1 (fr)

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DE10335888B4 (de) * 2003-08-06 2008-03-13 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zum Regeln des Gesamt-Schnittregisterfehlers einer Rollenrotationsdruckmaschine
DE102007054987A1 (de) * 2007-11-17 2009-05-20 Manroland Ag Rollendruckmaschine
DE102008017532A1 (de) * 2008-04-03 2009-10-08 Manroland Ag Schnittregisterregelung

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US4452140A (en) * 1981-02-19 1984-06-05 Crosfield Electronics Limited Printed web registration control apparatus
DE4225122A1 (de) 1992-07-30 1994-02-03 Roland Man Druckmasch Vorrichtung zur Korrektur des Schnittregisters
DE4238387B4 (de) 1992-11-13 2004-02-26 Heidelberger Druckmaschinen Ag Querschneider für Materialbahnen mit einer Regelungsvorrichtung für das Schnittregister
DE19623223C2 (de) * 1996-06-11 2001-05-17 Roland Man Druckmasch Antrieb für eine Druckmaschine
DE19719553A1 (de) * 1997-05-09 1998-11-12 Koenig & Bauer Albert Ag Falzapparat
DE19910835C1 (de) * 1999-03-11 2000-09-07 Innomess Elektronik Gmbh Verfahren zur Regelung einer Schnittposition an einer bedruckten Bahn für eine Rollenrotationsdruckmaschine
DE19936291B4 (de) 1999-08-02 2015-12-24 Wifag Maschinenfabrik Ag Bestimmung von Schnittlagen von Bahnsträngen in einer Rotationsdruckmaschine
DE10038551A1 (de) * 2000-08-03 2002-02-14 Roland Man Druckmasch Ermittlung der Voreinstelldaten für das Schnittregister (und das Farbregister) für längswellenlose Druckwerke
DE10154003A1 (de) * 2001-11-02 2003-05-15 Heidelberger Druckmasch Ag Vorrichtung und Verfahren zur Positionierung eines Querschnitts auf einem Bedruckstoff in Rollendruckmaschinen
DE10307202B4 (de) 2003-02-20 2006-09-28 Koenig & Bauer Ag Verfahren zur Voreinstellung von Produktionen einer Rollenrotationsdruckmaschine
DE10335885A1 (de) * 2003-08-06 2005-03-17 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zur Regelung der Bahnzugkräfte und der Schnittregisterfehler einer Rollenrotationsdruckmaschine
DE10335886B4 (de) * 2003-08-06 2013-12-19 Manroland Web Systems Gmbh Verfahren und Vorrichtung zum Regeln eines Gesamtschnittregisterfehlers einer Rotationsdruckmaschine
DE10355122A1 (de) 2003-11-24 2005-06-23 Man Roland Druckmaschinen Ag Vorrichtung und Regelverfahren zur Kompensation von Regelabweichungen bei geregelten Antriebssystemen von Transport- und Bearbeitungsmaschinen, insbesondere Druckmaschinen
DE102004051635A1 (de) * 2004-10-23 2006-05-18 Man Roland Druckmaschinen Ag Verfahren zur Schnittregistereinstellung bei einer Rollenrotationsdruckmaschine

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US20060102027A1 (en) 2006-05-18
EP1650147A1 (fr) 2006-04-26
US7496426B2 (en) 2009-02-24

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