EP1048460A2 - Influence de la déformation en éventail dans l'impression en offset humide rotative - Google Patents

Influence de la déformation en éventail dans l'impression en offset humide rotative Download PDF

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Publication number
EP1048460A2
EP1048460A2 EP00810346A EP00810346A EP1048460A2 EP 1048460 A2 EP1048460 A2 EP 1048460A2 EP 00810346 A EP00810346 A EP 00810346A EP 00810346 A EP00810346 A EP 00810346A EP 1048460 A2 EP1048460 A2 EP 1048460A2
Authority
EP
European Patent Office
Prior art keywords
web
printing
roller
speed
register
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00810346A
Other languages
German (de)
English (en)
Other versions
EP1048460A3 (fr
Inventor
Herbert Janser
Walter Dr. Siegl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wifag Maschinenfabrik AG
Original Assignee
Wifag Maschinenfabrik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19918399A external-priority patent/DE19918399B4/de
Application filed by Wifag Maschinenfabrik AG filed Critical Wifag Maschinenfabrik AG
Publication of EP1048460A2 publication Critical patent/EP1048460A2/fr
Publication of EP1048460A3 publication Critical patent/EP1048460A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices

Definitions

  • the invention relates to influencing the FAN-OUT in a wet offset rotary printing especially in a newspaper offset print.
  • the paper web also stretches under the influence of dampening solution between adjacent pressure points both lengthways and crossways to Running direction. Changes in transverse expansion between the pressure points, which are also under the Keyword of the FAN-OUT are particularly problematic. Have so So-called image regulator rollers for mastering the FAN-OUT in the Can not prove practice.
  • the invention has set itself the task of changes in transverse expansion or Changes in web width between successively printing on a printing web Reduce impression cylinders.
  • the transverse stretch of the printing web for a section of the web passes through several printing gaps arranged one behind the other between pairs of printing cylinders, by means of a pulling element or several pulling elements in the sense of a width or Constant elongation influenced.
  • the pretensioner or last pull roller used before the printing cylinders.
  • These pull rollers can also be used for Maintain a constant transverse expansion.
  • the transverse stretch is in a suitable place between the last pull roller in front of the printing cylinders and the next pull roller behind the printing cylinders by measurement, preferably by means of a Web width detection, determined, preferably based on those attached to the printing web Brands.
  • the transverse stretch on the web path is preferably between two successive ones Printing columns or behind the last printing gap of the print on the printing web Printing cylinder measured.
  • a single measuring point is sufficiently representative to be able to the transverse expansion at other points on the web between two successive ones To close printing columns. Basically, however, can alleviate between all Druckzy, that print one after the other on the same side of the web, one measurement of the transverse stretch and a mean value for the transverse elongation can be obtained.
  • the tension roller of the pretensioner or the tension roller of the pull-out mechanism or both tension rollers is or are particularly preferred in the sense of a disturbance variable compensation with the Cross elongation controlled as a disturbance variable.
  • the transverse expansion can also be the only one Feedback for the drive control of the pull roller or several for keeping constant the transverse expansion interacting pull rollers. Will the pull roller or will Pull rollers controlled to maintain a specified web tension, so is the web tension is specified in the form of a band, within which the web tension may fluctuate in order to enable the transverse expansion compensation.
  • Register inaccuracies i.e. Inaccuracies in the register and the cutting register
  • Register inaccuracies can be caused by drives for printing cylinders.
  • In acceleration and Deceleration phases of the machine is due to the inertia of the drives and the driven cylinders, while regulator drifts in production are taken into account.
  • An important cause for inaccuracies in the register, also with Longitudinal register is also a changing transport behavior of a web to be printed.
  • the modulus of elasticity generally changes Printing web.
  • There are also changes in the route to be taken into account for example when changing production while the machine is running by delivering and parking printing cylinders.
  • the invention has therefore also set itself the task of register inaccuracies Eliminate registers and / or cutting registers quickly and precisely or from the outset avoid.
  • a change in a method for a register-driven drive of a cylinder or a Register roller of a rotary printing machine is a change according to the invention Longitudinal stretching of a section of a printing web or that running through the machine Printing web determined overall from measured variables and by register adjustment of the cylinder or the register roller compensated.
  • the change is due to a change in the rotational position of the cylinder relative to a reference and / or by changing the position of the register roller so balanced that the color register and / or the cutting register despite the The change in longitudinal expansion is or will be complied with correctly.
  • Register roller should also be understood as other types of register adjustment means; ultimately the register-driven cylinders are also within the meaning of the invention Register adjustment means.
  • the measured variables for determining the change in the longitudinal expansion of the printing web can sizes or operating parameters of traction elements measured directly on the track those in a sufficiently good approximation of the longitudinal expansion or the change in Longitudinal expansion can be closed.
  • the change in longitudinal elongation is from a comparison of measured variables determined at different times have been included. There are measured variables at a first point in time and one added later, second time, and by comparing that to the first time Measured variables recorded with the measured variables recorded at the second point in time the temporal change in the longitudinal expansion is determined. The continuously determined in this way Changes are compensated by register adjustments.
  • the Printing web recorded a first web speed in front of a draw roller.
  • the Pull roller is preferably that of the pretensioner before Impression cylinders.
  • the first path speed thus represents the path speed between, for example, a reel changer and the leader.
  • a second Web speed of the same printing web is on a path of the printing web between this pull roller and a further pull roller next to the pull roller added.
  • the further pull roller is preferably that of the Pull-out mechanism behind the printing cylinders.
  • the second web speed between the draw roller of the Preload unit and the printing cylinder or printing unit following this pull roller added. At most, the web speed changes between the printing units slight, so that such speed changes can be neglected.
  • Out a value of the second web speed that was recorded at a first point in time and a value of the second web speed, which in a later, second A difference is formed.
  • the change in longitudinal expansion is determined. From the size of this Change according to amount and sign will be a register correction size for a Control device of a cylinder to be driven in register and / or an adjustment formed a register roller and switched off this control device.
  • Changes in longitudinal expansion can also be made by comparing the second Path speed can be determined with a third path speed, the third Web speed is measured immediately behind a pull roller of a pull-out unit. They can also be determined by comparing operating parameters of traction elements, the operating parameters are also measured variables.
  • the indirect compensation according to the invention of changes in longitudinal expansion by a Register adjustment or register regulation opens up scope for the invention Solution of the further problem of the change in transverse elongation.
  • the indirect compensation is but can also be used advantageously with other methods of transverse expansion compensation.
  • the invention also relates to a device for transporting and tensioning a web in a web-fed rotary printing press, especially in the Newspaper offset.
  • the device comprises a first pull roller and one with respect to the Direction of transport of the web spaced apart second pull roller. At least one these two rollers are preferably controlled with a web tension feedback or regulated driven to a certain web tension or a certain Maintain web tension profile.
  • Key figures for a longitudinal expansion within the Web-fed rotary printing presses are preferably made up of operating parameters for Control devices of the at least two rollers derived.
  • the operating parameters are measured variables which are used in regulators of drive motors of the rolls of Accruing from home, as they are used as control variables or to form control variables for the Drive control itself are needed.
  • the operating parameters can be one a roller or an actual speed that is tapped for this purpose on a motor shaft of the roller or actual angle of rotation position. In this case, these are the same Determination of the longitudinal stretch used for the key figures. However, these can also come from the Motor specification and primary operating parameters such as current and voltage are formed become. In this case, the actual speed or actual angle of rotation of the roller or the motor shaft is formed from these measured variables and then as a key figure for the Longitudinal stretching used.
  • the actual web tension can in connection with the measured or derived actual speed or actual angle of rotation position also serve as a key figure for determining the longitudinal elongation of the web.
  • the guide variable for the drive controller both the speed and the position is suitable, the following is also only representative of the position Speed cited.
  • a basic idea is that with ideal web management, if possible, over all Operating conditions of a web a web tension profile specified for this web during operation between a certain lower and upper web tension limit becomes.
  • the individual web tension profile is used for the multiple webs in a production each of these tracks is kept within the specified limits via the rail transport route.
  • this means that the webs are preferably on all the way through the machine by means of appropriately controlled web tension Pull rollers are guided. This can be done on the premise of keeping the constant Cross expansion between two pressure gaps. Will not the problem of FAN-OUT by changing the web tension by means of a corresponding regulation of Tension organ drives encountered, so fluctuations in the web tension are in a wide narrower tolerance band only permitted.
  • the modified invention also begins with the knowledge that to master the Web guidance provided that a predetermined web tension is set or a predetermined web tension profile is controlled or regulated, Changes in stretch of the web should also be recorded to determine the transport behavior describe the path and thereby the path guidance in terms of the most exact possible To be able to control the circumference register.
  • a web tension controlled draw roller is thus a predefined web tension profile set and maintained, and a web stretch, preferably a web elongation profile, with the help of a detection of the speeds determined by suitably selected or all traction elements.
  • a machine reference is basically the prerequisite for universal register control given in relation to the section and color register.
  • strain changes on the individual lanes of a production e.g. due to speed changes or roll changes can be recognized by the stretch profile of the individual web.
  • This Strain changes can be used as an essential controller input for influencing the Manipulated variables, e.g. of pressure cylinder drives and / or an adjustment drive Register roller can be used.
  • the web tension for the purpose of Drive control measured, for example with a measuring roller.
  • the actual value of the Web tension is applied to a drive controller or a setpoint device for a Drive controller fed back from it and a web tension setpoint and one Velocity master value forms a manipulated variable for the drive motor.
  • a web tension sensor for example a measuring roller, a Speed or rotary encoder required for the roller or the motor. It do not have all traction elements, their actual speed values to determine an elongation or of strains can be used on the basis of measured actual web tension values be tension controlled, although this also corresponds to a preferred variant.
  • At least those traction elements are preferably measured using Actual web tension values are driven in a web tension controlled manner, which immediately before the die Pressure column forming cylinders are arranged. If on compliance with one if possible constant transverse expansion to control the FAN-OUT is regulated, as preferred is, a fluctuation in the web tension within a given bands.
  • a drive motor for at least one pull roller due to the corresponding web tension feedback torque controlled Preferably, a three-phase motor with a direct Torque control used.
  • Torque control also drops the required speed information automatically within the drive control itself, so that encoders or encoders for Angle of rotation position need not be provided.
  • the at least one is preferably driven in a controlled manner via the web tension Pull roller driven by a drive motor provided only for the pull roller. If several pull rollers controlled by the web tension are provided, each These rollers are driven by their own drive motor, which drives the other drives Machine is electronically coupled.
  • the drive motor is preferably a AC motor.
  • a drive of a pull roller has a DROOP behavior on.
  • the drive controller includes a load-dependent speed reduction or - increase.
  • the motor is driven by the drive controller along a load characteristic Speed-controlled dependence on a load torque.
  • Speed-controlled dependence on a load torque In the case of one of the Machine speed compared to a feed roller operated with a lead
  • the extractor behind a printing unit is the speed of the drive motor Pull roller with an increase in the web tension in front of the pull roller and associated with it Increasing the load torque is regulated so that a drop in the speed of the drive motor is permitted along the load characteristic.
  • one operated with lag Pull roller of a pretensioner in front of the printing units will increase accordingly Roller speed allowed when the web tension increases.
  • the web and the traction roller with motor behave like two springs connected in series.
  • a web tension control is approximated by the controller with droop behavior, whereby the actual web tension is not necessarily fed back as a controlled variable for drive control must, although this is preferred.
  • a web B is replaced by a reel changer PR Preload unit with a pull roller 3, a printing unit DW, the printing unit downstream Guide rollers LW and a pulling roller 6 of a pulling unit in a turning bar area WS transported.
  • the web B is cut lengthways; two web strands B1 and B2 are shown after the longitudinal section.
  • Railway line B1 passes over another guide roller LW and the web strand B2 over another pull roller 11 behind the turning bar area WS and a register roller RW to a former.
  • the two web strands B1 and B2 are brought together in front of the former.
  • the pull roller 3 and the two further pull rollers 6 and 11 are the transport speeds in relation to the Machine speed, i.e. in the form of a lag or advance, likewise represented qualitatively.
  • the pull roller 6 in front of the turning bar area WS is also Lead operated. Since the web tension in the turning bar area WS drops rapidly, points the downstream pulling roller 11 is roughly the same size as the pulling roller 6.
  • the drive motors are at least the essential ones Traction elements controlled or regulated with a web tension feedback, so that the qualitatively displayed web tension profile in all operating conditions, in particular a change of roles and changes in speed of the web. On Ultimately, slip that can never be completely avoided can be tolerated.
  • the web B which unwinds from a reel changer, is about a pretensioner or a first tension roller 3 and an associated web tension measuring roller 4 promoted by printing units DW 1 to DW 4 of a printing tower DT and at the exit of the last printing unit transported by means of a second pull roller 6.
  • To tension the Web B becomes the first draw roller 3 with respect to the machine speed Latching driven while the second pull roller 6 of machine speed is driven prematurely.
  • the first draw roller 3 is driven by a drive motor 7 and the second draw roller 6 by driven another drive motor 7.
  • the drive motors 7 each drive only the respective pull roller 3 or 6.
  • Each of the drive motors 7 is controlled by a control device with a drive controller 8 Constantly speed or position controlled.
  • Changes in web tension for example by a or more than one of the aforementioned reasons can be caused in itself in a known manner by driving the at least the first one in accordance with the web voltage control Draw roller 3 balanced, such that the drive motor 7 of the first draw roller 3 Compliance with a predetermined web tension S2 should be regulated on the first pull roller 3.
  • a reference value generator 9 of the control device is used to determine the reference speed Printing cylinder surface as the master setpoint VL, the web tension to be set in the form of the Setpoint S2soll and the measured actual web tension S2 from the measuring roller 4.
  • the setpoint generator 9 processes the master setpoint VL for the reference speed by this value is a change in speed in the form of a lag from the TARGET-ACTUAL comparison of the web tensions S2soll and S2 superimposed.
  • the drive system for the second pull roller 6 has the same components as that of the Pull roller 3 on. However, this system does not have a setpoint for the web tension specified, and it also contains no feedback for the actual value of the web tension.
  • the Web tension is applied to the second pull roller 6 at the pressing speed Observe the web or manually using a measuring roller with web tension display set by the leading setpoint VL in the setpoint generator 9 a speed advance d3VL is superimposed. This lead value d3VL usually remains throughout Working speed range constant.
  • the drive system for the second pull roller 6 the same control as in the case of the drive system for the first Pull roller 3 with specification of its own setpoint and feedback of an actual value for the Web tension on the second pull roller 6 can be used.
  • the ACTUAL speeds V2 and V3 for the two pull rollers 3 and 6 and the TARGET web tension S2 should the first pull roller 3 in a register correction computer 15th read.
  • Required register corrections are made from the known speed-strain relationship determined, the elongation e1 in front of the first pull roller 3 in Embodiment from the web tension S1 and the current for production Web tension-elongation diagram is determined.
  • the longitudinal expansion e2 in the pressure tower DT between the drawing rollers 3 and 6 then becomes e1 and the codes V2 and V3 determined.
  • the register correction computer 15 finally forms from changes in the Longitudinal expansion e2 register correction values, which the control devices of the register driven cylinders of the printing units DW1 to DW4 and an actuator for Setting and correction of the cutting register.
  • the printing units DW1 to DW4 of Druckturm DT or the drive motors of their cylinders, in particular the Blanket cylinder, and an actuator of one or more register rollers on the Transport path of the single track B is provided.
  • Strain changes between the first Pull roller 3 and the second pull roller 6 are preferably by simultaneous, coordinated adjustment of printing cylinders printing on this web B is compensated. If Further tension rollers arranged on the transport path of the web B are controlled by the web tension are driven, for example, the drawing rollers 6 and 11 indicated in Fig. 1, in Each intermediate piece of the transport route between two in a row in the transport direction arranged pulling rollers determines a longitudinal expansion taking place in this area and be compensated in a targeted manner.
  • the compensation of the individual webs in the sense of a clean cutting register is used of the register correction computer 15 coordinates. Instead of a section by rail In principle, it would also be possible to compensate, only the total stretch of everyone individual of the paths to be merged between the farthest apart located drawing rollers, in the exemplary embodiment the drawing rollers 3 and 11 (Fig. 1) and then compensate accordingly.
  • Fig. 3 shows an example of an alternative embodiment for the drive control of Pull rollers of the printing machine. Only the first pull roller 3 is indicated Drive motor 7, a direct torque control is provided.
  • An actual value computer 12 receives the measured values for motor current and voltage I and U as input values and determines the exact ones from these at given cycle times Actual values D and B for torque and magnetic flux.
  • the actual values D and B are fed to a drive controller 8.
  • the actual value computer 12 also determines the actual value from its input variables Motor speed V, which is also supplied to the drive controller 8 as a controlled variable.
  • the setpoint generator 9 receives the master setpoint VL for the Reference speed of the impression cylinder surface supplied. From the master setpoint VL and a TARGET-ACTUAL comparison of the setpoint Ssoll of the web tension and that by means of Measuring roller 1 of the actual value S of the web tension measured forms the setpoint generator 9 as already the setpoint generator in the embodiment of FIG. 2, the speed setpoint Vsoll, which is placed on the input of the drive controller 8. With this input it turns out then if Vsoll and V match, this is for the required web tension corresponding torque, which is now the drive controller 8 as a torque setpoint It should be specified.
  • the above basic setting of the drive according to Fig. 3 is carried out by as in 2 with the aid of a measuring roller 1 and the setpoint device 9th for example at the pressing speed and the desired web tension Speed setpoint Vset is set.
  • the drive can then use the master setpoint Follow VL while observing the torque Dsoll corresponding to the web tension, see above that a corresponding actual speed V arises, which in the direct Torque control advantageously without a specific speed or Position sensor is transmitted to the drive controller 8.
  • direct torque control can in particular have high dynamic requirements for accelerations and decelerations be mastered safely.
  • Appropriate calibration methods can ultimately be used for the Measuring roller 1 can be dispensed with. This is in the diagram of FIG. 3 with the dashed line indicated for the web tension feedback.
  • the drive controller 8 From the command variables Vsoll and Dsoll, or in the simplified control variant instead of VL and Dsoll, and the control variables V, D and B, the drive controller 8 forms the manipulated variable for the motor 7.
  • the direct torque control also supplies the actual values for the Speeds of the drawing rollers, namely in the form of the measured variables I and U determined speed V of the respective drive motor 7. These values can be like already described in connection with FIG. 2, a register correction computer 15 supplied and as a key figure for determining the register correction values, in particular the Cutting register can be used.
  • DROOP means here that at a certain torque increase from Mi to Mj, the speed or Velocity decreases from Vi to Vj.
  • the DROOP factor a is defined as the Difference quotient from speed difference and moment difference.
  • the one Drive controller 8 having DROOP behavior so that the Difference quotient of speed and torque in the size arrangement of a Factor 10 behaves softer than the spring characteristic of the web.
  • DROOP-adjusted drive controller from the setpoint generator 9 so that by means of Web tension measurement and comparison with the web tension setpoint one corresponding lag to the master setpoint of the reference speed.
  • Another advantageous possibility to use the large speed range consists of directly pulling the pull rollers within the permissible web tension range Regulate web stretching.
  • the acquisition of a Register control is not primarily used to determine the corresponding angular positions of the Adjust pressure cylinder and / or register rollers, but around the pull rollers to control that no expansion deviations between pressure and Production speed arise.
  • the setting of the DROOP behavior can advantageously also with drives direct torque control can be applied.
  • Each drive controller 8 of the first Embodiment can be equipped with the DROOP function.
  • FIG. 6 shows a particularly simple exemplary embodiment for regulating the Draw roller drives shown.
  • the actual value feedback the web tension only for determining the lower and upper limit values SU, SO and the working point C.
  • the drive motors 7 of the two pull rollers 3 and 6 are based on the speed guide value VL performed, which in the case of the first pull roller 3 a lag d2VL and in In the case of the second pull roller 6, an advance d3VL is superimposed.
  • the two drive controllers 8 each have a DROOP behavior, so that the pull roller drives corresponding to the controller characteristic curve set for each of the drive controllers 8 have soft elastic behavior that is in good approximation to the compliance with the Tension rollers 3 and 6 desired web tensions are sufficient.
  • the measuring roller 4 can with the tension roller 3 with web tension display primarily used to track the lag for the first draw roller 3 at the beginning of the Manual setting of production at pressure speed.
  • the same goes for in principle also for the drive system of the second pull roller 6.
  • the control of the drive of the first pull roller 3 also a constant TARGET-ACTUAL comparison the web tension are carried out; also optional for the drive control for the second pull roller 6.
  • the drive control without Actual value feedback of the web tension due to the DROOP behavior as Web tension control can be called.
  • web B winds from a paper roll changer PR from. It is from the paper roll changer PR via a measuring roller 1 for measuring the Web tension and a speed measuring device 2 to the drawing roller 3.
  • the web B passes from the pull roller 3 via a further measuring roller 4 for measuring the Web tension in a printing tower DT with 4 printing units DW1 to DW4, of which only the first printing unit DW1 and the last printing unit DW4 are shown.
  • web B is printed on both sides in four colors. Behind the last printing unit is DW4 the second pull roller 6 of the pull-out mechanism is arranged. Between the two pull rollers 3 and 6, the web B is tensioned.
  • Each of the printing units DW1 to DW4 has two Printing cylinders D1 to D4 forming pressure gaps, in the exemplary embodiment blanket cylinders, a plate cylinder for each impression cylinder, the mechanical one for a common drive is coupled to the respectively assigned pressure cylinder D1 to D4, and subordinate Ink and dampening systems.
  • Each of the impression cylinders D1 to D4 is individually made by one own drive motor 17 each driven by a single toothed belt.
  • the each assigned plate cylinders and the subsequent inking and dampening unit are towed driven by their pressure cylinder D1 to D4.
  • the drive can also on the Plate cylinder take place from which would then be driven.
  • a drive connection via the Web does not exist, i.e. between two opposing pressure cylinders D1 to D4 path B forms the only mechanical coupling.
  • the printing cylinders D1 to D4 are driven to each other in accordance with the color register. Changes the longitudinal expansion of the continuous path are adjusted by coordinated register adjustments those of the impression cylinders D1 to D4, which are on the same side of the web B to press.
  • one of the printing cylinders D1 to D4 is one for each web side
  • the reference cylinder and the other printing cylinders are driven in register.
  • the two first printing cylinders D1 in the web running direction are the Reference cylinder, and the subsequent printing cylinders D2 to D4 are kept in register Driven with respect to their respective reference cylinder D1.
  • the register regulation allows advantageously this flexibility.
  • the paper roll changer PR is controlled by the web tension using a drive motor MPR driven to maintain a constant web tension S1.
  • S2 is the web tension for that section of the web whose longitudinal extension e2 is. In the exemplary embodiment, this is the section between the pull roller 3 and the Printing gap of the first printing unit DW1.
  • the web tension S2 is measured by means of the measuring roller 4 measured.
  • the web speed V1 is the web speed in front of the draw roller 3 and the web speed V2 is the web speed between the draw roller 3 and the printing gap of the printing unit DW1.
  • the web speed V1 represents the Speed of the web between the paper roll changer PR and the pull roller 3 and is measured by means of the measuring device 2.
  • the web speed V2 is called Operating parameters of the drive motor 7 for the pull roller 3 by means of a Motor speed sensor 7a added to the motor shaft.
  • a change in the longitudinal extension e2 can be determined in a particularly simple manner.
  • the web tension S1 does not change within a time interval dt or only changes in a negligible manner.
  • the same is assumed for the web speed V1. Basically, this can also be assumed for the modulus of elasticity.
  • the necessary for this Measurands i.e. either only the web speeds V1 and V2 or V2 and V3 or all four variables V1, V2, S1 and S2 are fed into the register correction computer 15.
  • the register correction computer 15 Longitudinal elongation change de2 is calculated.
  • the register correction computer 15 determines from this Color register correction values FK2 for the second printing unit, FK3 for the third printing unit and FK4 for the fourth printing unit.
  • the color register correction sizes are Control devices 18 for the drive motors 17 of the pressure cylinders D2 to D4 activated.
  • the control devices 18 for the respective drive motors 17 provide Framework of the drive control for the necessary register adjustments due to Longitudinal changes de2.
  • the change in elongation de2 can Control devices 18 can also be connected directly, but then each individually Correction size for the respective printing cylinder must form.
  • the correction is made by the change in the angular position of the printing cylinder to be corrected with respect to the reference cylinder.
  • the regulation of the drive motors 17 is otherwise known provided.
  • the pressure cylinder D1-D4 referred to EP 0 644 048 A2, one of which, for example describes the drive control that can be used, but without applying changes the longitudinal expansion of a printing web.
  • the transverse stretch is a function of the web speed, the Web tension and the dampening of the web. It can also be influenced via these parameters become.
  • Figure 8 illustrates the applicable laws for two assumed web tensions S2. After that, with increasing web tension, in addition to the reduction in transverse elongation overall, the influence of more or less dampening solution can also be reduced.
  • This Connections are used for corrective measures with regard to the transverse expansion, in particular by influencing the web tension. So it is by means of a suitable Web width detection sensors possible, changes in transverse elongation with the help of To regulate web tension as a manipulated variable within permissible side pass tolerances.
  • the pull roller 3 is driven in a tension-controlled manner, as is already the case in principle the embodiments of Figures 1 to 6 has been described. However, one Fluctuation of the web tension - in the case of the tension roller 3 of the web tension S2 - in one given bandwidth allowed.
  • the pull roller 3 is namely not on compliance constant web tension S2 regulated, but to maintain a constant transverse elongation or web width, for example a predetermined transverse extension Qsoll.
  • the Web tension can also be regulated so that the temporal change in the web width or Transverse elongation, i.e. Q (t2) - Q (t1) is made zero.
  • the default Fluctuation bandwidth for the web tension is chosen as large as possible. On However, trouble-free rail transport must of course be guaranteed.
  • a DROOP controlled The drive of the pull roller 3 is suitable from the start.
  • a measuring sensor is used 5 the transverse elongation Q of the continuous web B is measured or determined.
  • a transverse stretch measurement takes place between two of the pressure cylinders D1 to D4 and if possible directly in front of one of the printing cylinders D2 to D4.
  • a measurement immediately behind the last printing cylinder D4 of the print is particularly advantageous. This enables the FAN-OUT-related change in transverse expansion to be recorded immediately become.
  • a camera in particular a CCD camera, is suitable as the measurement sensor 5.
  • the markings on the printing web B are recorded and the measured transverse expansion Q is output.
  • the calculation of the transverse expansion Q from the measured values can also be carried out elsewhere respectively.
  • the measured transverse elongation Q is compared with the specified one in a comparator 10 or the transverse expansion to be observed Qsoll.
  • the Transverse expansion deviation dQ is the control device 8, 9 for the pull roller 3 as Abandoned variable.
  • the transverse elongation deviation dQ is given by Change in speed of the pull roller 3 or change in the rotational position of the pull roller 3 in Regarding the rotational position of the pull roller 6 regulated towards zero. Changes in web tension As long as they are within a tolerance band, S2 become in the sense of a Constant elongation maintenance permitted.
  • the next to the transverse stretch for the print quality only significant changes in the longitudinal expansion e2 are made by color register adjustments balanced in the pressure cylinders.
  • the comparison 10 is advantageously more integrated Part of the register correction computer 15.
  • the transverse elongation Q determined with the aid of a measurement sensor 5 is shown in FIG Register correction computer 15 performed.
  • the register correction computer 15 forms by comparison with the specified, to be maintained or adjusted transverse expansion Qsoll Speed correction variable dV2.
  • the correction variable dV2 becomes the target tension variable V2 target of the DROOP-controlled Drive of the pull roller 3 superimposed. Because the constant elongation through Change in web tension S2 is effected and changes in web tension S2 Longitudinal elongation changes de2 cause corrective interventions also due to the Keeping the transverse expansion constant on the pressure cylinders or on the register roller 20 required.
  • Each control device for the drive motors of the impression cylinder and the Control device 28 for the drive motor 27 of the register roller 20 is the Longitudinal elongation change de2 abandoned.
  • the correction quantity de2 is determined using the individual Control devices converted into individual register adjustments.
  • the existing pull rollers with the DROOP-controlled drive can be regulated with web tension driven pull rollers, as in the embodiments of Figures 2 and 7 also are used, and can also be realized with torque-controlled drawing rollers.
  • Combinations of pull rollers with different control concepts can be used, for example, a tension roller 3 driven by web tension and a DROOP-controlled or torque-controlled pull roller 6.
  • both pull rollers 3 and 6 are torque controlled. It can also control the tension roller 6 web tension and the pull roller 3 can be driven by DROOP or torque control.
  • the DROOP-controlled, but also the torque-controlled drive have a desired Compliance.
  • a web tension controlled drive roller has the advantage that the approved fluctuation band close to that in the sense of a trouble-free Rail transportation possible upper and lower limit of the web tension can be expanded.
  • the other two concepts require larger safety margins.
  • a very beneficial one It is a combination if one of the two pull rollers 3 and 6, preferably the pull roller 3, web tension controlled is driven with the largest possible in the above sense Belt in which the web tension may fluctuate and the other pull roller just open constant speed controlled or DROOP or torque controlled or regulated are driven.
  • the drive controls of the traction elements, in particular the combinations mentioned above can also be advantageous without the invention Elongation compensation can be used, for example for a rail transport on Compliance with a predetermined web tension is aligned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
EP00810346A 1999-04-22 2000-04-20 Influence de la déformation en éventail dans l'impression en offset humide rotative Withdrawn EP1048460A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19918399A DE19918399B4 (de) 1998-04-22 1999-04-22 Beeinflussung des FAN-OUT in einem Nassoffset Rotationsdruck
DE19918399 1999-04-22

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EP1048460A2 true EP1048460A2 (fr) 2000-11-02
EP1048460A3 EP1048460A3 (fr) 2002-10-09

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005007406A2 (fr) * 2003-07-11 2005-01-27 Koenig & Bauer Aktiengesellschaft Procede et dispositif pour influer sur le phenomene de tuilage
WO2005072967A3 (fr) * 2004-01-28 2006-02-02 Koenig & Bauer Ag Procedes pour compenser un allongement transversal et/ou un allongement longitudinal d'une matiere d'impression et machine a imprimer comportant plusieurs groupes d'impression produisant une image imprimee sur une matiere d'impression
DE102007037564A1 (de) * 2007-08-09 2009-02-19 Robert Bosch Gmbh Verfahren zur Achskorrektur bei einer Verarbeitungsmaschine sowie Verarbeitungsmaschine
EP2447071A1 (fr) * 2009-06-25 2012-05-02 Mitsubishi Heavy Industries Printing & Packaging Machinery, Ltd. Dispositif de correction d'alignement en largeur, imprimante et procédé de correction d'alignement en largeur
EP2703160A1 (fr) * 2012-08-27 2014-03-05 Goss International Americas, Inc. Contrôle de l'élongation d'alimentation
WO2015130389A1 (fr) * 2014-02-27 2015-09-03 Eastman Kodak Company Procédé de réduction d'artefacts utilisant une commande de tension

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US3025791A (en) * 1957-09-09 1962-03-20 Champlain Company Inc Variable web tension for uniform layoff
DE1290406B (de) * 1962-07-10 1969-03-06 Huck Design Corp Vorrichtung zum Fuehren einer laufenden Bahn
DE2642381A1 (de) * 1976-09-21 1978-03-23 Goebel Gmbh Maschf Einrichtung zum registerhaltigen zufuehren einer bahn
DE2807469A1 (de) * 1977-02-24 1978-08-31 Zimmer Maschf P Verfahren zum kontinuierlichen ausrichten von warenbahnen sowie geraderichteinheit hierzu
USRE32967E (en) * 1982-11-24 1989-06-27 Xerox Corporation Web tracking system
US5365847A (en) * 1993-09-22 1994-11-22 Rockwell International Corporation Control system for a printing press
EP0644048A2 (fr) * 1993-12-29 1995-03-22 Maschinenfabrik Wifag Machine d'impression rotative, avec des cylindres porte-blanchet et porte-clichés réunisen groupes de cylindres par paires
EP0951993A1 (fr) * 1998-04-22 1999-10-27 Maschinenfabrik Wifag Entraínement en parfait repérage pour un cylindre ou pour un rouleau de registre d'une machine rotative

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Publication number Priority date Publication date Assignee Title
US3025791A (en) * 1957-09-09 1962-03-20 Champlain Company Inc Variable web tension for uniform layoff
DE1290406B (de) * 1962-07-10 1969-03-06 Huck Design Corp Vorrichtung zum Fuehren einer laufenden Bahn
DE2642381A1 (de) * 1976-09-21 1978-03-23 Goebel Gmbh Maschf Einrichtung zum registerhaltigen zufuehren einer bahn
DE2807469A1 (de) * 1977-02-24 1978-08-31 Zimmer Maschf P Verfahren zum kontinuierlichen ausrichten von warenbahnen sowie geraderichteinheit hierzu
USRE32967E (en) * 1982-11-24 1989-06-27 Xerox Corporation Web tracking system
US5365847A (en) * 1993-09-22 1994-11-22 Rockwell International Corporation Control system for a printing press
EP0644048A2 (fr) * 1993-12-29 1995-03-22 Maschinenfabrik Wifag Machine d'impression rotative, avec des cylindres porte-blanchet et porte-clichés réunisen groupes de cylindres par paires
EP0951993A1 (fr) * 1998-04-22 1999-10-27 Maschinenfabrik Wifag Entraínement en parfait repérage pour un cylindre ou pour un rouleau de registre d'une machine rotative

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101428495B (zh) * 2003-07-11 2010-09-01 柯尼格及包尔公开股份有限公司 利用影响捻开效应的装置用于影响捻开效应的方法
WO2005007406A3 (fr) * 2003-07-11 2005-06-16 Koenig & Bauer Ag Procede et dispositif pour influer sur le phenomene de tuilage
WO2005007406A2 (fr) * 2003-07-11 2005-01-27 Koenig & Bauer Aktiengesellschaft Procede et dispositif pour influer sur le phenomene de tuilage
US7536955B2 (en) 2003-07-11 2009-05-26 Koenig & Bauer Aktiengesellschaft Method and device for influencing the fan-out effect
WO2005072967A3 (fr) * 2004-01-28 2006-02-02 Koenig & Bauer Ag Procedes pour compenser un allongement transversal et/ou un allongement longitudinal d'une matiere d'impression et machine a imprimer comportant plusieurs groupes d'impression produisant une image imprimee sur une matiere d'impression
US7614343B2 (en) 2004-01-28 2009-11-10 Koenig & Bauer Aktiengesellschaft Methods for the compensation of a transverse elongation and/or longitudinal elongation of a printing material and printing press with several printing couples generating at least one printed image on a printing material
DE102007037564A1 (de) * 2007-08-09 2009-02-19 Robert Bosch Gmbh Verfahren zur Achskorrektur bei einer Verarbeitungsmaschine sowie Verarbeitungsmaschine
DE102007037564B4 (de) * 2007-08-09 2013-11-14 Robert Bosch Gmbh Verfahren zur Achskorrektur bei einer Verarbeitungsmaschine
EP2447071A1 (fr) * 2009-06-25 2012-05-02 Mitsubishi Heavy Industries Printing & Packaging Machinery, Ltd. Dispositif de correction d'alignement en largeur, imprimante et procédé de correction d'alignement en largeur
CN102458858A (zh) * 2009-06-25 2012-05-16 三菱重工印刷纸工机械有限公司 宽度套准修正装置、印刷机及宽度套准修正方法
EP2447071A4 (fr) * 2009-06-25 2012-11-21 Mitsubishi Heavy Ind Printing Dispositif de correction d'alignement en largeur, imprimante et procédé de correction d'alignement en largeur
EP2703160A1 (fr) * 2012-08-27 2014-03-05 Goss International Americas, Inc. Contrôle de l'élongation d'alimentation
WO2015130389A1 (fr) * 2014-02-27 2015-09-03 Eastman Kodak Company Procédé de réduction d'artefacts utilisant une commande de tension

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