EP3715136B1 - Verfahren zum betreiben einer digitalen bahndruckmaschine, steuerungsvorrichtung und bahndruckmaschine - Google Patents

Verfahren zum betreiben einer digitalen bahndruckmaschine, steuerungsvorrichtung und bahndruckmaschine Download PDF

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Publication number
EP3715136B1
EP3715136B1 EP19165838.4A EP19165838A EP3715136B1 EP 3715136 B1 EP3715136 B1 EP 3715136B1 EP 19165838 A EP19165838 A EP 19165838A EP 3715136 B1 EP3715136 B1 EP 3715136B1
Authority
EP
European Patent Office
Prior art keywords
web
roller
print
conveying speed
basis
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.)
Active
Application number
EP19165838.4A
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German (de)
English (en)
French (fr)
Other versions
EP3715136A1 (de
Inventor
Philipp Rost
Bernhard Dirsch
Elmar SCHÄFERS
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.)
Siemens AG
Original Assignee
Siemens 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
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP19165838.4A priority Critical patent/EP3715136B1/de
Priority to ES19165838T priority patent/ES2931776T3/es
Priority to US16/831,037 priority patent/US11396192B2/en
Priority to CN202010231348.7A priority patent/CN111746162B/zh
Publication of EP3715136A1 publication Critical patent/EP3715136A1/de
Application granted granted Critical
Publication of EP3715136B1 publication Critical patent/EP3715136B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B41J3/546—Combination of different types, e.g. using a thermal transfer head and an inkjet print head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/008—Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • B41J11/46—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering by marks or formations on the paper being fed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/66—Applications of cutting devices
    • B41J11/663—Controlling cutting, cutting resulting in special shapes of the cutting line, e.g. controlling cutting positions, e.g. for cutting in the immediate vicinity of a printed image

Definitions

  • the present invention relates to a method for operating a digital web printing machine, a control device for operating a digital web printing machine and a web printing machine with such a control device.
  • DE 10 2015 104 575 discloses a method for optimizing halftone dot positioning in digital printing.
  • an object of the present invention is to propose an improved method for operating a digital web printing machine.
  • a method for operating a digital web printing machine comprises the following steps.
  • a frequency is selected for driving a digital print head at the frequency for dispensing ink onto a print swath.
  • a target conveying speed for conveying the print web is determined as a function of the selected frequency and of print data.
  • a motor driving a first roller and/or a motor driving a second roller is controlled depending on the target conveying speed in such a way that the printing web between the first roller and the second roller, in particular directly under the digital print head, is fed with the target -Conveying speed is promoted.
  • the digital print head is controlled with the selected frequency and depending on the print data.
  • This method has the advantage that the digital print head of the web printing machine is controlled with a selected, fixed frequency, which is why a complex dynamic control of the digital print head and an associated measurement and control system can be omitted.
  • a web printing machine operated with this method can therefore be constructed less complex and thus be cheaper to manufacture.
  • the digital print head is arranged above the print web between the first and the second roller.
  • the target conveying speed preferably relates to the position of the print web exactly under the print head. This means that the target conveying speed for the print web is reached directly under the print head so that the print result matches the print data.
  • the digital print head hereinafter also simply print head, includes, for example, a number of print nozzles.
  • the number determines a maximum print resolution of the print head.
  • the maximum print resolution depends on how large a minimum quantity of printing ink is that the print head can emit with a print nozzle in one cycle.
  • clock is understood to mean the length of a period at the selected frequency.
  • Frequency determines the number of times a given print nozzle can eject ink.
  • the amount of printing ink to be output per cycle or per activation can be set individually for each nozzle of the print head. Furthermore, the amount can be different and adjustable from cycle to cycle.
  • the printing ink is understood to mean the consumable material that is used to produce a print, for example ink or toner. Which material is used as the printing ink depends on the printing technique used.
  • the print data include the motif to be printed, for example as a machine-readable data set.
  • the motif to be printed is available as a digital image data record, for example as a vector graphic or as a bitmap, which is also referred to below as a template.
  • this template will converted or translated into the print data by means of a printer driver, with a maximum resolution of the print head being taken into account in particular.
  • the print data include a resolution with which the original is to be reproduced. If the frequency is known and the print data are available, the target conveying speed at which the print web is to be conveyed under the print head can be determined.
  • the print data includes two lines which are 1 cm apart and are to be printed perpendicularly to the conveying direction of the print web.
  • the target conveying speed results, for example, as the product of the print head resolution and the frequency. For example, with a resolution of 10,000 points per cm and a frequency of 10 kHz, the target conveying speed is 1 cm/s or 0.6 m/min.
  • the target conveying speed determined in this way as a function of the selected frequency is set by appropriate regulation of the motors that drive the first roller and/or second roller conveying the printed web. This means that the print web is conveyed at the target conveying speed so that correct printing according to the artwork is guaranteed.
  • a peripheral speed of the respective roller can be derived from a rotational frequency of the motor driving the respective roller, a gear ratio and the diameter of the respective roller.
  • the peripheral speed of the respective roller corresponds to the transport speed of the printing web at the roller.
  • the print web is conveyed, for example, with a specific tension. This can lead to an elongation of the printed web, which is why a conveying speed can be different on the first roller and on the second roller and also between the rollers can assume different values, which must be taken into account in the regulation.
  • the print result achieved, the printout will correspond to the template.
  • the dimensions of the printout and a color intensity will correspond to those of the template.
  • a conveying parameter of the first roller and/or the second roller is detected and a conveying speed of the printed web is determined as a function of the conveying parameter.
  • the first motor and/or the second motor is controlled as a function of the determined conveying speed, so that the conveying speed corresponds to the desired conveying speed.
  • This embodiment has the advantage that an actual conveying speed is determined and is used to control the motors for conveying the printed web at the target conveying speed.
  • a conveying parameter includes, for example, a rotational frequency, a torque, a diameter, the wrapping of the respective roller with the printing web and/or a coefficient of friction between the respective roller and the printing web.
  • the wrap indicates, for example, what proportion of the respective roller is wrapped by the printing web.
  • the wrap can be specified as an angle, for example.
  • the coefficient of friction relates in particular to a particular combination of a roller with a specific material.
  • the speed or the torque of the respective roller can be inferred from the speed or the torque of the respective motor.
  • a transfer function is preferably used for this purpose known, which takes into account, for example, a gear ratio and/or a loss value.
  • the conveying speed determined can include a first conveying speed of the print web on the first roller, a second conveying speed of the print web on the second roller and/or a conveying speed at one or more points between the two rollers.
  • a print web parameter of the print web is detected and the first motor and/or the second motor is/are controlled as a function of the detected print web parameter.
  • This embodiment has the advantage that parameters of the print web that can affect a conveying characteristic, in particular a conveying speed, are taken into account.
  • Printing web parameters include, in particular, material parameters such as a modulus of elasticity and/or a behavior of the printing material during printing. Furthermore, geometric parameters such as a thickness of the printing material and/or a width of the printing web can be taken into account.
  • a thickness of the print material can be variable, which can directly affect the conveying speed.
  • the material thickness is detected and the conveying speed is regulated accordingly as a function of the detected thickness.
  • a register mark is periodically printed onto the print web by the digital print head.
  • a distance between two consecutively printed register marks on the print web is then detected and the first motor and/or the second motor is controlled as a function of the detected distance.
  • Periodic printing of register marks is preferably understood to mean that there is a fixed time interval between two register marks printed one after the other, for example one second.
  • the actual conveying speed results from the detected distance between two consecutively printed register marks, for example as the quotient of the distance divided by the time interval.
  • a specific register mark sensor can be provided, which is arranged after the print head in the conveying direction.
  • a color saturation or color intensity of the register marks can also be recorded, for example. If the saturation is too low, for example, the amount of ink emitted by a print nozzle per cycle can be adjusted.
  • image data are generated as a function of a print motif printed on the print web by the digital print head.
  • the image data is compared with the print data.
  • the first motor and/or the second motor are controlled depending on a result of the comparison.
  • This embodiment is advantageous because the print result is recorded at least partially, advantageously also in its entirety, and checked by means of the comparison.
  • a digital image sensor such as a CCD camera, is arranged after the print head in the conveying direction and captures the image data.
  • a dimension of a printed graphic with the dimension of the graphic in the print data is compared. For example, a difference is formed between the recorded value and the theoretical value. If the result of the difference is positive, then the printed graphic is larger than the template (feed rate too high) and if the difference is negative, then the printed graphic is smaller than the template (feed rate too low).
  • An incorrect conveying speed therefore leads to a stretching or compression of a graphic in comparison with the template, which can be corrected in this embodiment by adjusting the conveying speed.
  • a color saturation or color intensity of the printed graphic can be compared with the original and the output quantity of printing ink of a printing nozzle per cycle can be adjusted accordingly.
  • an output quantity of the printing ink for a printing nozzle of the digital print head is set in a period of the selected frequency as a function of the print data and the set conveying speed.
  • This embodiment is advantageous because it allows a maximum color intensity or print density to be adjusted. Furthermore, shades or color gradations can also be produced in the same way at different conveying speeds.
  • a control device for operating a digital web printing machine includes a setting unit for setting a selected frequency, a determination unit for determining a target conveying speed of a print web as a function of the frequency and print data, a control unit for controlling a first motor driving a first roller and/or a second motor driving a second roller for setting the conveying speed of the print web running between the first roller and the second roller as a function of the determined target conveying speed, and a control unit for controlling a digital print head for outputting printing ink at the frequency and as a function of the print data.
  • This control device is advantageously set up to operate a digital web printing machine according to the method according to the first aspect, from which the above-mentioned advantages result.
  • the embodiments and features explained for the method apply correspondingly to the control device.
  • the control device is implemented at least partially in hardware, but can also be implemented at least partially in software.
  • the control device can be designed, for example, as a computer or as a microprocessor.
  • Parts implemented by software are designed, for example, as a computer program product, as a function, as a routine, as part of a program code or as an executable object.
  • the setting unit preferably includes a clock that is set up to output the selected frequency.
  • control device comprises a first detection unit for detecting a conveying parameter of the first roller and/or the second roller, the determination unit being set up to determine the conveying speed as a function of the detected operating parameter.
  • the control unit is set up to control the first motor and/or the second motor as a function of the determined conveying speed.
  • the regulation of the conveying speed thus advantageously takes place as a function of the conveying speed derived from the conveying parameters.
  • a conveying parameter includes, for example, a rotational frequency, a torque, a diameter, the wrapping of the respective roller with the printing web and/or a coefficient of friction between the respective roller and the printing web.
  • the wrap indicates, for example, what proportion of the respective roller is wrapped by the printing web.
  • the wrap can be specified as an angle, for example.
  • the coefficient of friction relates in particular to a particular combination of a roller with a specific material.
  • the speed or the torque of the respective roller can be inferred from the speed or the torque of the respective motor.
  • a transfer function is preferably known for this purpose, which takes into account a gear ratio and/or a loss value, for example.
  • the conveying speed determined can include a first conveying speed of the print web on the first roller, a second conveying speed of the print web on the second roller and/or a conveying speed at one or more points between the two rollers.
  • control device comprises a second detection unit for detecting a print web parameter of the print web.
  • the determination unit is set up to determine the conveying speed as a function of the recorded printing web parameter.
  • the control unit is set up to control the first motor and/or the second motor as a function of the determined conveying speed.
  • the regulation of the conveying speed thus advantageously takes place as a function of the conveying speed derived from the printing web parameters.
  • Printing web parameters include, in particular, material parameters such as a modulus of elasticity and/or a behavior of the printing material during printing. Furthermore, geometric parameters such as a thickness of the printing material and/or a width of the printing web can be taken into account.
  • a thickness of the print material can be variable, which has a direct effect on the conveying speed.
  • the material thickness is detected and the conveying speed is regulated according to the detected thickness.
  • control device comprises a third acquisition unit for acquiring sensor data from the printed web and a correction unit for determining a correction value as a function of the print data and the acquired sensor data.
  • the determination unit is set up to determine a corrected conveying speed as a function of the correction value and the control unit is set up to control the first motor driving the first roller and/or the second motor driving the second roller in order to set the corrected conveying speed.
  • This embodiment is advantageous because errors in a printed image, which can result, for example, from incorrect assumptions and/or inaccuracies in a physical model of the operated web printing machine on which the determination of the conveying speed is based, can be directly corrected on the basis of a print result actually achieved.
  • the third detection unit includes, for example, an optical sensor, such as an image sensor, which detects the printed print motif and converts it into image data.
  • the correction unit compares the captured image data with the print data.
  • the correction unit is part of the determination unit, for example. In particular, the correction unit determines whether the image data matches the print data in terms of the dimensions of graphics and the color intensities, or whether there are any deviations. The type of deviation is also determined, for example whether compression or stretching is present.
  • a corresponding correction value is determined and output. The correction value is used to determine a corrected conveying speed, for example by addition or by multiplication.
  • a web printing machine is proposed with a printing web running between a driven first roller and a driven second roller.
  • a digital print head is positioned between the first roller and the second roller above the print web for dispensing ink onto the print web.
  • the web printing machine comprises a control device according to the second aspect, which is set up to operate the web printing machine.
  • This web printing machine can advantageously be operated using the control device according to the method according to the first aspect, which results in the above-mentioned advantages.
  • the embodiments and features explained for the method apply correspondingly to the web printing machine.
  • the web printing machine comprises a means for detecting a conveying parameter of the first roller and/or the second roller.
  • the control device is set up to operate the printing machine as a function of the conveying parameter that has been detected.
  • the means comprises a sensor which, for example, detects a peripheral speed of the respective roller and/or a torque on the roller surface of the respective roller as the conveying parameter.
  • the control device takes the conveying parameter into account, in particular for controlling the motors that drive the respective roller.
  • the conveying parameter can also be a derived value, for example the circumferential speed or the torque on the roll surface can be deduced from a speed or a torque of a motor with a known gear ratio and roll diameter.
  • this comprises a means for detecting a printing web parameter of the printing web, the control device being set up to operate the printing machine as a function of the detected material parameter.
  • the means includes a sensor that detects, for example, a conveying speed and/or a tensile stress of the print web in the area of the first roller, in the area of the second roller and/or between the rollers as the print web parameter.
  • the sensor preferably works without contact, such as an optical sensor, so that the sensor does not influence the conveying characteristics.
  • the print web parameter is not used to adjust a drive frequency of the print head, but to regulate the transport speed of the print web.
  • Further printing path parameters are, for example, material parameters of the printing material used, such as a modulus of elasticity.
  • this comprises a sensor arranged after the digital print head in the conveying direction of the print web for acquiring sensor data from the printed print web.
  • the control device is set up to determine a correction value as a function of the detected sensor data and the print data and to operate the web printing press as a function of the correction value.
  • This embodiment is advantageous because it eliminates errors in a printed image that occur, for example, due to incorrect assumptions and/or inaccuracies in a physical model of the operated web printing machine can be corrected directly on the basis of an actually achieved printing result.
  • the sensor is preferably an optical sensor and set up to detect register marks and/or the printed print motif.
  • Register marks are, in particular, periodic markings printed on the print web by the digital print head. In this respect, the register marks are part of the print data. A distance between two consecutively printed register marks depends on the conveying speed. Therefore, the conveying speed can be inferred from the distance and this can therefore be regulated accordingly. If the printed print motif is recorded, a match between the printed print motif and the print data can be determined. Depending on whether the printed print motif matches the print data or how it deviates therefrom, a correction value can be determined, in particular for the conveying speed to be set, in order to achieve a match.
  • a computer program product such as a computer program means
  • a server in a network, for example, as a storage medium such as a memory card, USB stick, CD-ROM, DVD, or in the form of a downloadable file. This can be done, for example, in a wireless communication network by transferring a corresponding file with the computer program product or the computer program means.
  • FIG. 1 shows a schematic block diagram of an embodiment of a method for operating a digital web printing machine 200 (see 4 ).
  • a frequency F (see Figures 2 - 4 ) with which the digital print head 210 (see 4 ) to emit ink 212 (see 4 ) is selected.
  • selection means, for example, that an operator of the web printing machine 200 enters the frequency F via a suitable input device.
  • the frequency F can be derived from certain boundary conditions will. Provision can furthermore be made for the frequency F to be permanently specified, for example by the print head 210, since this can only be operated at a specific frequency F.
  • a target conveying speed vs (see 2 , 3 ) for the conveying speed v (see 4 ) determined.
  • the target conveying speed vs can be determined, in particular calculated, for example from a relationship between the frequency F and a desired print resolution.
  • the print resolution results, for example, from print data D (see Figures 2 - 4 ).
  • the rollers 220, 230 which includes a print web 240 (see 4 ) through a print area 250 (see 4 ) promote, regulated in such a way that the conveying speed v of the printing web 240 corresponds to the target conveying speed vs.
  • a first motor M1 that drives the first roller 220
  • a second motor M2 that drives the second roller 220 can be regulated accordingly.
  • a fourth step 40 the digital print head 210 is driven with the selected frequency F and the print data D.
  • This method can be used in particular to operate a web printing machine 200 whose print head 210 is not controlled at a variable frequency as a function of a detected conveying speed of the print web 240 .
  • control device 100 which can operate a web printing machine 200 by means of the method described.
  • FIG. 1 shows a schematic block diagram of a first exemplary embodiment of a control device 100.
  • the control device 100 includes a setting unit 110 that is set up for setting a selected frequency F.
  • the setting unit 110 includes, in particular, a clock generator. Furthermore, the setting unit 110 can have an input means or a receiving means for selecting the frequency F.
  • the setting unit 110 outputs the selected and set frequency F to a determination unit 120 and a control unit 140 .
  • the determination unit 120 is set up to determine a setpoint delivery speed vs as a function of the frequency F and pressure data D.
  • the print data D are specified or entered from the outside in particular and include, for example, a print motif M to be printed (see 4 ) in the form of machine-readable data.
  • the control unit 140 is set up to read the print data D and a digital print head 210 (see 4 ) to be controlled accordingly.
  • the ink 212 emitted in one period creates a pixel on the print swath 240 .
  • the determination unit 120 outputs the determined target delivery speed vs to a control unit 130 .
  • the control unit 130 controls a first motor M1 as a function of the target conveying speed vs (see 4 ), which has a first roller 220 (see 4 ) drives, and/or a second motor M2 (see 4 ), which has a second roller 230 (see 4 ) drives.
  • the conveying speed v (see 4 ) of the print web 240 is set to the setpoint conveying speed vs. This ensures that the printed print motif M matches the print data D.
  • FIG 3 shows a schematic block diagram of a second embodiment of a control device 100.
  • This second embodiment has all the features of the first embodiment of FIG 2 on.
  • the control device 100 here includes three acquisition units 150, 160, 170 and a correction unit 172.
  • the first detection unit 150 is for detecting a conveying parameter P1, P2 of the first roller 220 (see 4 ) and/or the second roller 230 (see 4 ) furnished.
  • the first conveying parameter P1 includes, for example, a peripheral speed v1 (see 4 ) of the first roller 220 and the second conveying parameter P2 includes, for example, a peripheral speed v2 (see 4 ) of the second roller 230.
  • the determination unit 120 is set up to determine the conveying speed v of the printing web 240 as a function of the parameters P1, P2.
  • the control unit 130 is set up to control the conveying speed v as a function of the determined conveying speed v.
  • the second detection unit 160 is set up to detect a printing path parameter P3. This is, for example, a thickness of the print web 240.
  • the determination unit 120 is set up to determine the conveying speed v of the print web 240 as a function of the parameter P3.
  • the control unit 130 is set up to control the conveying speed v as a function of the determined conveying speed v.
  • the third acquisition unit 170 is for acquiring image data B from a digital print head 210 (see 4 ) printed print motif M (see 4 ) furnished.
  • the correction unit 172 determines a correction value K as a function of the captured image data B and the print data D.
  • the correction value K is used by the determination unit 120 to determine a corrected conveying speed vk.
  • the corrected conveying speed vk is a sum from the target conveying speed vs and the correction value K.
  • the determination unit 120 outputs the target conveying speed vs or the corrected conveying speed vk to the control unit 130, whereupon the latter controls the conveying speed v of the print web 240 accordingly.
  • FIG. 12 schematically shows an exemplary embodiment of a web printing machine 200.
  • the web printing machine 200 comprises, in particular, a control device 100 that is set up to operate the web printing machine 200.
  • the control device 100 can, for example, one of the in the 2 or 3 shown embodiments correspond.
  • the control device 100 is for performing the basis of 1 set up the procedure described.
  • the web printing machine 200 includes a digital print head 210 which is arranged over a printing web 240 .
  • the digital print head 210 is set up to eject ink 212 onto the print web 240 by means of print nozzles (not shown).
  • the area in which the print head 210 can eject ink 212 onto the print swath 240 is referred to as the print area 250 .
  • the print area 250 is located between a first roller 220 and a second roller 230 which convey the print web 240 .
  • the first roller 220 can also be referred to as a feed roller
  • the second roller 230 can also be referred to as a discharge roller.
  • Four guide rollers 260 are arranged between the rollers 220, 230 and serve to support and guide the print web 240 in the printing area 250. For reasons of clarity, only one guide roller 260 is marked with a reference number.
  • the guide rollers 260 are not driven and are preferably mounted so that they can rotate very easily, so that they rotate with the printing web 240 without affecting it.
  • the first roller 220 is driven by a first motor M1 and the second roller 230 is driven by a second motor M2.
  • the motors M1, M2 are in particular electric motors and drive the rollers 220, 230 directly, which means that there is no gearing between the motor M1, M2 and the respective roller 220, 230.
  • a particularly precise control of the conveying speed v of the print web 240 can be implemented.
  • the control device 100 operates the web printing machine 200. This is done according to the basis of 1 described procedure.
  • the control device 100 operates the web printing machine 200 as a function of print data D and a selected frequency F.
  • the frequency F determines the time intervals at which a print nozzle of the print head 210 can emit printing ink 212 .
  • the control device 100 determines the target conveying speed vs at which the print web 240 is to be conveyed through the print area 250, so that the printed print motif M matches the print data D.
  • the control device 100 comprises in particular a determination unit 120 (see FIG 2 or 3 ).
  • the control device 100 includes a control unit 130 (see FIG 2 or 3 ), which regulates the motors M1, M2 in such a way that the printed web 240 is conveyed at the setpoint conveying speed vs.
  • the printing machine 200 also includes an optional sensor 270, which is embodied here as a CCD camera.
  • the CCD camera 270 is arranged behind the print head 210 in the conveying direction.
  • the CCD camera 270 captures the print motifs M printed by the print head 210 and converts them into image data B.
  • the image data B are output to the control device 100 . This monitors whether the image data B match the print data D, ie whether the print result achieved corresponds to the print data D. If there is a discrepancy between the image data B and the print data D, a correction unit 172 (see 3 ) a correction value K, which the control device 100 takes into account during the operation of the web printing machine 200.
  • the conveying speed v of the print web 240 is set to a corrected conveying speed vk set.
  • an output amount of printing ink 212 can also be adjusted by a printing nozzle per activation period if, for example, a color intensity of the printed print motif M deviates from the print data D. In the case of multicolored printouts, a color mixture can also be adjusted.

Landscapes

  • Ink Jet (AREA)
  • Handling Of Sheets (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
EP19165838.4A 2019-03-28 2019-03-28 Verfahren zum betreiben einer digitalen bahndruckmaschine, steuerungsvorrichtung und bahndruckmaschine Active EP3715136B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19165838.4A EP3715136B1 (de) 2019-03-28 2019-03-28 Verfahren zum betreiben einer digitalen bahndruckmaschine, steuerungsvorrichtung und bahndruckmaschine
ES19165838T ES2931776T3 (es) 2019-03-28 2019-03-28 Procedimiento para operar una máquina de impresión digital en bobina, equipo de control y máquina de impresión en bobina
US16/831,037 US11396192B2 (en) 2019-03-28 2020-03-26 Digital web printing press, control apparatus and method for operating the digital web printing press
CN202010231348.7A CN111746162B (zh) 2019-03-28 2020-03-27 运行数字卷筒纸印刷机的方法、控制装置和卷筒纸印刷机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19165838.4A EP3715136B1 (de) 2019-03-28 2019-03-28 Verfahren zum betreiben einer digitalen bahndruckmaschine, steuerungsvorrichtung und bahndruckmaschine

Publications (2)

Publication Number Publication Date
EP3715136A1 EP3715136A1 (de) 2020-09-30
EP3715136B1 true EP3715136B1 (de) 2022-11-16

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EP19165838.4A Active EP3715136B1 (de) 2019-03-28 2019-03-28 Verfahren zum betreiben einer digitalen bahndruckmaschine, steuerungsvorrichtung und bahndruckmaschine

Country Status (4)

Country Link
US (1) US11396192B2 (zh)
EP (1) EP3715136B1 (zh)
CN (1) CN111746162B (zh)
ES (1) ES2931776T3 (zh)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005169628A (ja) * 2003-12-05 2005-06-30 Canon Inc インクジェット記録装置およびインクジェット記録方法
JP4622400B2 (ja) 2004-09-08 2011-02-02 富士ゼロックス株式会社 画像記録装置
US8411308B2 (en) 2008-03-13 2013-04-02 Riso Kagaku Corporation Printing machine and ejection control method for the same
JP5566792B2 (ja) 2010-06-25 2014-08-06 富士フイルム株式会社 画像記録方法および画像記録装置
US9004629B2 (en) 2012-12-17 2015-04-14 Xerox Corporation Image quality by printing frequency adjustment using belt surface velocity measurement
JP2015013454A (ja) 2013-07-08 2015-01-22 富士ゼロックス株式会社 画像形成装置
DE102015104575A1 (de) * 2015-03-26 2016-09-29 Océ Printing Systems GmbH & Co. KG Verfahren zur Optimierung der Rasterpunktpositionierung im Digitaldruck
JP6715120B2 (ja) 2016-07-25 2020-07-01 株式会社Ｓｃｒｅｅｎホールディングス 基材処理装置および蛇行予測方法
US10792930B2 (en) * 2017-09-29 2020-10-06 Canon Kabushiki Kaisha Liquid ejection apparatus and liquid ejection head
JP6971828B2 (ja) * 2017-12-19 2021-11-24 キヤノン株式会社 記録装置および記録方法

Also Published As

Publication number Publication date
ES2931776T3 (es) 2023-01-02
US20200307264A1 (en) 2020-10-01
CN111746162A (zh) 2020-10-09
CN111746162B (zh) 2022-05-31
EP3715136A1 (de) 2020-09-30
US11396192B2 (en) 2022-07-26

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