EP3744521A1 - Procédé de réglage de traction d'une bande à imprimer, dispositif de réglage et dispositif de transport de bande à imprimer - Google Patents

Procédé de réglage de traction d'une bande à imprimer, dispositif de réglage et dispositif de transport de bande à imprimer Download PDF

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Publication number
EP3744521A1
EP3744521A1 EP19177061.9A EP19177061A EP3744521A1 EP 3744521 A1 EP3744521 A1 EP 3744521A1 EP 19177061 A EP19177061 A EP 19177061A EP 3744521 A1 EP3744521 A1 EP 3744521A1
Authority
EP
European Patent Office
Prior art keywords
roller
motor
tension
function
printing web
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Withdrawn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
EP19177061.9A
Other languages
German (de)
English (en)
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 EP19177061.9A priority Critical patent/EP3744521A1/fr
Publication of EP3744521A1 publication Critical patent/EP3744521A1/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Withdrawn legal-status Critical Current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
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/16—Means for tensioning or winding the web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • 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
    • B65H23/192—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 motor-controlled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B65H2513/11—Speed angular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/31—Tensile forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/32—Torque e.g. braking torque
    • 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
    • B65H2801/15—Digital printing machines

Definitions

  • the present invention relates to a method for regulating the tension of a printing web, a regulating device for regulating the tension of a printing web and a printing web conveying device with such a regulating device.
  • measuring roller with which the tensile stress is measured directly and output as a control variable for a drive roller for setting the tensile stress.
  • the measuring roller must have a sufficient wrap around the fabric.
  • the measuring roller must be arranged in the web section in which the tensile stress is to be regulated, for example in the pressure area. The measuring roller therefore has a direct influence on the print web in this area. In particular, interference from the measuring roller can occur.
  • an object of the present invention is to propose an improved method for regulating the tension of a printing web.
  • a method for tension control of a printing web conveyed between a driven first roller and a driven second roller is proposed.
  • a first operating parameter of the first roller is recorded.
  • a second operating parameter of the second roller is recorded.
  • an actual tension value of the printing web is determined as a function of the recorded first operating parameter and the recorded second operating parameter.
  • a tension control signal is determined as a function of a predetermined target tension value and the determined tension value, and in a fifth step a first motor driving the first roller and / or a second motor driving the second roller is controlled as a function of the tension control signal determined.
  • This method advantageously enables the tension control of the printing web between the first roller and the second roller without an explicit measurement of a current tension of the printing web between the first roller and the second roller being carried out for this purpose.
  • a corresponding measuring device in particular a measuring roller, can therefore be omitted between the first roller and the second roller, where, for example, a pressure area is arranged.
  • a printing press operated with this method can therefore be constructed in a significantly simpler and more cost-effective manner. Since the print area is also particularly sensitive to disturbances that are caused, for example, by the measuring roller, a printing operation can be more stable and a consistently high print quality can be ensured.
  • the method is particularly suitable for use in digital web printing machines that use a digital print head.
  • the printing web consists, for example, of a material that includes fibers, such as paper or textile materials. Such materials have the property that they stretch under tension, since the fibers behave like a spring. Furthermore, a material structure can change as a result of the printing process, which can also affect the stretching of the print web.
  • dynamic control is therefore advantageous.
  • the proposed method has the particular advantage that, in embodiments of the method, a fixed point of the printing web, that is to say a position between the rollers at which the conveying speed of the printing web is constant, can be freely selected.
  • the print web is conveyed by two driven rollers in or through the print area.
  • the printing area is determined in particular by a print head which is preferably arranged above the printing path.
  • non-driven guide rollers can be arranged, which define a course for the printing web.
  • the printing path can run along a planar or also a curved, for example convex, path.
  • the printing web wraps around the first and the second roller along their respective circumference. The greater the wrap, the greater the force that can be transmitted from the roller to the printing web (and vice versa).
  • the first operating parameter and the second operating parameter are, for example, the respective peripheral speed of the first or the second roller.
  • the first roller and the second roller are each driven by an electric motor, for example.
  • the rollers are preferably driven directly, but a transmission can also be provided.
  • a circumferential speed of the first roller or the second roller can be determined directly from a speed of the electric motor, a diameter of the respective roller, and possibly a gear ratio. Since the diameter of the respective roller and the gear ratio are known, the first and / or second operating parameter can also be determined as a function of a signal output by a motor encoder of the respective motor.
  • the first operating parameter and the second operating parameter are preferably a torque with which the first roller and the second roller each act on the printing web.
  • the actual pull value the print web can then be determined, for example, as a function of the difference between the first operating parameter and the second operating parameter.
  • the actual tension value corresponds, for example, to an instantaneous tension in the printing web between the first roller and the second roller.
  • the instantaneous tensile stress can be location-dependent, which means that it is not constant over the entire area between the first roller and the second roller.
  • a tension control signal is determined as a function of the determined actual tension value and a predetermined target tension value. If the actual tension value corresponds to the target tension value, the tension control signal is zero.
  • the determined tension control signal is used to control the first motor and / or the second motor.
  • the first motor and the second motor are regulated, for example, in order to achieve a specific rotational frequency.
  • the tension control signal is fed to a respective controller, for example.
  • the tension control signal can in particular be different for the first motor and the second motor.
  • the predetermined target tension value of the printing web is advantageously set or regulated in the printing area without the need for a measuring roller. This ensures particularly trouble-free operation.
  • a first conveying parameter of the printing web before the first roller and a second conveying parameter of the printing web after the second roller are also recorded.
  • the actual tension value of the printing web is determined as a function of the recorded first conveying parameter and the recorded second conveying parameter.
  • the first conveying parameter is, for example, an actual tension value of the printing web in front of the first roller. In front of the first roller, this refers to a point on the printing path in the conveying direction the print web is in front of the first roller.
  • the first conveying parameter can also include a conveying speed of the printing web on or near the first roller.
  • the second conveying parameter is, for example, an actual tension value of the printing web after the second roller. After the second roller refers here to a point on the print web which, viewed in the conveying direction of the print web, lies after the second roller.
  • the second conveying parameter can also include a conveying speed of the printing web on or near the second roller.
  • the first and / or second conveying parameter can, for example, be specified or predetermined. For example, it can be ensured by a corresponding device upstream of the first roller or downstream of the second roller that the actual tension value of the printing web each has a certain value, to which the respective predetermined conveying parameter then corresponds, for example.
  • the first and / or second conveying parameter can also be recorded by means of a measuring device or the like, the corresponding measuring device being arranged in front of the first roller or after the second roller, so that it is ensured that the printing web is between the first roller and the second roller is not affected by this.
  • the actual tension value of the printing web is determined exclusively as a function of the recorded first operating parameter, the recorded first conveying parameter, the recorded second operating parameter and the recorded second conveying parameter.
  • This embodiment excludes the use of explicit measuring devices for determining the actual tension value between the first roller and the second roller.
  • the method can therefore advantageously be used in printing machines that do not have such a measuring device.
  • the tension control signal is also determined as a function of a material parameter of the printing web.
  • the actual tension value is set as a function of various material parameters, which are taken into account accordingly. These are, for example, a modulus of elasticity (E-module) and / or an elongation of the printing web.
  • E-module modulus of elasticity
  • the tension control can thus work even more precisely.
  • the tension control signal is also determined as a function of a geometric parameter of the printing web.
  • the actual tension value is set in particular as a function of the geometric dimensions, such as a thickness and / or a width, of the printing web, which is hereby taken into account accordingly.
  • the tension control can thus work even more precisely.
  • the first operating parameter and / or the second operating parameter comprises a torque, a rotational frequency, a gear ratio, a roller diameter, a wrap and / or a coefficient of friction.
  • the first operating parameter relates to the first roller
  • the second operating parameter relates to the second roller.
  • the roller diameter, the wrap and the coefficient of friction determine, in particular, a power transmission between the roller and the printing web.
  • the wrap indicates, for example, which portion of the respective roller is wrapped by the print 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.
  • this further comprises regulating the first motor as a function of the detected first operating parameter and a first setpoint, and regulating the second motor as a function of the detected second operating parameter and a second setpoint.
  • the first target value and the second target value are, for example, a target rotational frequency. This can be used to set a specific conveyor speed.
  • the first target value and the second target value are preferably determined as a function of a predetermined conveying speed. Furthermore, the first delivery parameter and the second delivery parameter can be taken into account.
  • the first motor and the second motor are regulated as a function of a predeterminable fixed point on the printing web.
  • the fixed point can also be referred to as a terminal point.
  • the fixed point is characterized in that a conveying speed of the printing web at the fixed point is kept constant by the regulation.
  • the fixed point can be chosen freely. For example, this can be done by specifying weighting factors by means of which the first conveying parameter and / or the second conveying parameter are applied.
  • a computer program product such as a computer program means
  • a regulating device for regulating the tension of a printing web conveyed between a driven first roller and a driven second roller.
  • the control device comprises a first motor controller for controlling the first motor driving the first roller, a second motor controller for controlling the second motor driving the second roller, a first means for detecting a first operating parameter of the first roller, a second means for detecting a second operating parameter of the second roller and a tension controller for generating a tension control signal as a function of the recorded first operating parameter, the recorded second operating parameter and a predetermined target tension value.
  • the first motor controller is set up to control the first motor as a function of the generated tension control signal and / or the second motor controller is set up to control the second motor as a function of the generated tension control signal.
  • This regulating device is preferably set up to regulate a tensile stress of a printing web according to the method of the first aspect, which is why it has the advantages described there.
  • the embodiments of the first aspect apply accordingly to the control device.
  • the control device is at least partially implemented in terms of hardware, but can also be implemented at least partially in terms of software.
  • the control device can be designed as a device or as part of a device, for example a computer or a microprocessor. Parts implemented using software technology 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 first motor controller, the second motor controller and the tension controller are preferably designed as proportional-integral controllers.
  • control device further comprises a controller for determining a first setpoint and a second setpoint as a function of a predetermined setpoint.
  • the first motor controller is set up to control the first motor as a function of the first setpoint value and the second motor controller is set up to control the second motor as a function of the second setpoint value.
  • the regulator is preferably set up for setting a conveying speed of the printing web.
  • the regulator is superordinate to the tension regulator.
  • the predetermined setpoint relates in particular to the conveying speed.
  • the controller is designed, for example, as a proportional controller.
  • this further comprises a first means for detecting a first conveying parameter and a second means for detecting a second conveying parameter.
  • the controller is set up to determine the first setpoint value and the second setpoint value as a function of the recorded first conveying parameter and the detected second conveying parameter.
  • the first and / or the second conveying parameter are, for example, an actual conveying speed of the printing web for the first roller or the second roller.
  • the first conveying parameter relates to an actual tension value of the printing web before the first roller
  • the second conveying parameter relates to an actual tension value of the printing web after the second roller.
  • certain dynamic effects such as a slip between the first and / or the second roller and the printing web, can therefore be taken into account.
  • the controller is set up to determine the first setpoint and the second setpoint as a function of a predeterminable fixed point of the printing web.
  • the fixed point can also be referred to as a terminal point.
  • the fixed point is characterized in that a conveying speed of the printing web at the fixed point is kept constant by the regulation.
  • the fixed point can be chosen freely. For example, this can be done by specifying weighting factors by means of which the first conveying parameter and / or the second conveying parameter are applied.
  • a printing web conveying device for conveying a printing web between a driven first roller and a driven second roller with a control device for regulating the tension of the printing web according to the second aspect.
  • the printing web conveying device comprises a first motor driving the first roller and a second motor driving the second roller.
  • the printing web is free of tension measuring devices between the first roller and the second roller.
  • the printing web conveying device can in particular be used as part of a web printing machine, preferably for conveying the printing web in a printing area.
  • the printing web conveyor device has the particular advantage that a tensile stress of the printing web can be regulated without a disruptive measuring device. This has the advantage, especially in digital printing machines with a digital print head, that interference is avoided.
  • the printing web conveying device can in particular have a simpler structure and can be manufactured more cheaply than conventional printing web conveying devices with an explicit tensile stress measuring device.
  • the printing web conveying device has the regulating device according to the second aspect, this is advantageous according to the method according to the first aspect can be operated, which brings the advantages described there with it.
  • the embodiments of the first and / or second aspect apply accordingly to the printing web conveyor.
  • Fig. 1 shows a schematic block diagram of an embodiment of a method for tension control of a printing web 110 (see Fig. 2 , 3 or 4th ) in one between one driven first roller 120 and a driven second roller 130 arranged printing area 112.
  • An exemplary printing web conveyor 200 is shown in FIG Fig. 2 and is explained below.
  • a first operating parameter P1 (see Fig. 3 or 4th ) of the first roller 120 detected.
  • the operating parameter P1 is, for example, a current rotational frequency of a motor M1 driving the first roller 120.
  • a second operating parameter P2 of the second roller 130 is recorded.
  • the operating parameter P2 is, for example, a current rotational frequency of a motor M2 driving the second roller 130.
  • the motors M1, M2 are in particular electric motors. To regulate the electric motors M1, M2, they each have a motor encoder, for example, which in particular detects the respective rotational frequency and sends it to a respective motor controller R1, R2 (see FIG Fig. 3 or 4th ) outputs.
  • the rotational frequency of the respective motor M1, M2 also corresponds to the rotational frequency v1, v2 (see FIG Fig. 2 ) of the respective roller 120, 130. If the motors M1, M2 drive the respective roller 120, 130 via a gear, a respective gear ratio must be taken into account. As an alternative or in addition to the rotational frequency, in particular a respective torque can be recorded.
  • an actual tension value of the printing web 110 is determined as a function of the recorded first operating parameter P1 and the recorded second operating parameter P2.
  • the actual tension value can be determined in particular from a difference in the torques with which the first roller 120 and the second roller 130 act on the printing web 110. Material parameters and geometric parameters of the printing web 110 are preferably taken into account here.
  • a tension control signal Zr is determined as a function of a predetermined target tension value Zs and the actual tension value determined.
  • the tension control signal Zr Service in particular for setting or adjusting the motors M1, M2 so that the printing web 110 is conveyed between the first roller 120 and the second roller 130 with the tension setpoint.
  • the predetermined target tension value Zs can in particular be specified externally.
  • the predetermined target tension value is preferably determined as a function of a conveying speed and / or a material of the printing web.
  • the first motor M1 and / or the second motor M2 is controlled as a function of the determined tension control signal Zr.
  • the first motor M1 and the second motor M2 are preferably controlled by a respective motor controller R1, R2 for setting a specific conveying speed of the printing web 110.
  • the tension control signal Zr is in this respect also fed to at least one motor controller R1, R2.
  • This motor controller R1, R2 then regulates the respective motor M1, M2 accordingly.
  • An exemplary embodiment of a control device 100 is shown in which only the second motor M2 is controlled as a function of the tension control signal Zr.
  • An exemplary embodiment of a further control device 100 is shown in which both motors M1, M2 are controlled as a function of the tension control signal Zr.
  • FIG. 3 shows a schematic view of an exemplary embodiment of a printing web conveyor device 200.
  • the printing web conveyor device 200 in particular has a regulating device 100, which uses the FIG Fig. 1 explained methods for controlling the motors M1, M2 are used.
  • Exemplary embodiments of a structure of the control device 100 are shown in FIGS Fig. 3 and 4th and are explained below.
  • the printing web conveying device 200 is set up for conveying a printing web 110 in or through a printing area 112 which is arranged between a first roller 120 and a second roller 130.
  • the printing web conveying device 200 is, for example, part of a larger printing press.
  • the print area 112 is determined in particular by the arrangement of a print head 140.
  • the print head 140 is set up to print the print web 110 in the print area 112.
  • the first roller 120 is driven by a first motor M1 and the second roller 130 is driven by a second motor M2.
  • the first roller 120 can also be referred to as a feed roller
  • the second roller 130 can also be referred to as a discharge roller.
  • Both rollers 120, 130 preferably have the same diameter, which is 30 cm here, for example.
  • the printing web 110 is conveyed at a conveying speed in the range of 80-160 m / min. This corresponds to a rotational frequency of approx. 85 - 170 rpm.
  • the rollers 120, 130 are wrapped around the printing web 110 to a sufficient degree so that an effective transmission of force from a respective roller 120, 130 to the printing web 110 can take place.
  • five guide rollers 150 are arranged between the first roller 120 and the second roller 130, only one of the guide rollers 150 being identified with a reference symbol for reasons of clarity.
  • the guide rollers 150 are arranged in particular in the printing area 112.
  • the guide rollers 150 support the printing web 110 and ensure that it runs in a specific manner.
  • the guide rollers 150 are preferably mounted very smoothly and rotate with the movement of the printing web 110.
  • the guide rollers 150 are not driven.
  • the regulating device 100 regulates the motors M1, M2 as a function of detected operating parameters P1, P2 of the first roller 120 and the second roller 130, as well as as a function of a predetermined target tension value Zs that is specified externally.
  • the control device 100 outputs a corresponding control signal RM1 to the first motor M1 and outputs a corresponding control signal RM2 to the second motor M2.
  • the first motor M1 and the second motor M2 are controlled in such a way that the first roller rotates at a rotational frequency v1 and conveys the printing web 110 and that the second roller 130 rotates at a rotational frequency v2 and conveys the printing web 110.
  • This regulation also ensures that the tensile stress of the printing web 110 is regulated in accordance with the predetermined nominal tensile value Zs.
  • the rotational frequencies v1, v2 of the first roller 120 and the second roller 130 can in particular be different, for example in order to take into account an expansion of the printing web 110 between the first roller 120 and the second roller 130.
  • FIG. 10 shows a schematic block diagram of a first exemplary embodiment of a control device 100, which is used, for example, in the printing web conveying device 200 of Fig. 2 can be used.
  • the control device 100 is in particular for performing the based on Fig. 1 explained procedure.
  • the control device 100 comprises four controllers: a first motor controller R1, a second motor controller R2, a tension controller RZ and a controller R0, which is set up in particular for higher-level position control, for example adjusting to a predetermined conveying speed.
  • the two motor controllers R1, R2 and the tension controller RZ are designed, for example, as a proportional-integral controller (PI controller), the controller R0 is designed, for example, as a proportional controller (P controller).
  • PI controller proportional-integral controller
  • P controller proportional controller
  • the controller R0 receives an externally specified setpoint value vs for the conveying speed. Depending on the setpoint vs, the controller R0 outputs a first setpoint S1 to the first motor controller R1 and a second setpoint S2 to the second motor controller R2.
  • the motors M1, M2 each have a motor encoder which is used to acquire a motor parameter for regulating the respective motor M1, M2.
  • An operating parameter P1, P2 of the respective roller 120, 130 can be determined from the respective motor parameter as a function of the specific structure of the first roller 120 and the second roller 130.
  • the motor controller R1 determines a control signal depending on the parameter P1 and the setpoint S1 RM1, by means of which the first motor M1 is regulated.
  • the control signal RM1 is also fed to the tension controller RZ.
  • the tension controller RZ determines a tension control signal Zr as a function of the control signal RM1, a predetermined target tension value Zs and a control signal RM2 determined by the second motor controller R2 for controlling the second motor M2. It should be noted that the tension controller RZ alternatively or additionally uses the operating parameters P1, P2 of the first roller 120 and the second roller 130 directly for tension control. In the present case, only the second motor M2 is controlled with the tension control signal Zr, which is why the tension control signal Zr is only fed to the second motor controller R2 as an input signal. The motor controller R2 thus determines the control signal RM2 by means of which the second motor M2 is controlled as a function of the parameter P2, the setpoint S2 and the tension control signal Zr.
  • the tension controller RZ therefore only acts on the motor M2 by supplying the motor controller R2 with an additional speed setpoint that is dependent on the actual conditions and the predetermined tension setpoint Zs.
  • the web tension is thus adjusted by changing the rotational speed of the discharge roller 130.
  • the feed roller 120 thus represents a fixed point for the web conveyance.
  • FIG. 3 shows a schematic block diagram of a second exemplary embodiment of a control device 100, which is used, for example, in the printing web conveying device 200 of Fig. 2 can be used.
  • the control device 100 is in particular for performing the based on Fig. 1 explained procedure.
  • the control device 100 shown here has all based on Fig. 3 explained features, whereby various other influencing factors can also be taken into account.
  • the control device 100 is thus constructed somewhat more complex, but at the same time can be used more flexibly than that in FIG Fig. 3 shown.
  • a first difference is that both the first motor controller R1 and the second motor controller R2 regulate as a function of the tension control signal Zr. Furthermore, a means 122 for detecting a first conveying parameter f1, in particular a current conveying speed and / or an actual tension value, of the printing web 110 at or in front of the first roller 120 is arranged on the first roller 120. Furthermore, a means 132 for detecting a second conveying parameter f2, in particular a current conveying speed and / or an actual tension value, of the printing web 110 at or after the second roller 130 is arranged on the second roller 130.
  • This structure is advantageous because, for example, different material thicknesses of the printing web 110, which can have a direct effect on the conveying speed, are taken into account. Furthermore, a slip between one of the rollers 120, 130 and the printing web 110 as well as a dynamic behavior of the printing web 110 influenced by further factors, such as an elongation as a function of the print motif, can be taken into account in this embodiment.
  • the controller R0 determines a setpoint S1 for the first motor controller R1 and a setpoint S2 for the second motor controller R2 depending on the delivery parameters f1 ', f2', these corresponding to the delivery parameters f1, f2 to which a weighting factor u1, u2 is applied.
  • the weighting factors u1, u2 the nip or the fixed point of the printing web 110, the position of which is regulated by the controller R0, can be flexibly defined between the two rollers 120, 130.
  • u1 + u2 1.
  • the tension controller RZ determines a tension control signal Zr, which is sent to the first motor controller R1 as a tension control signal, taking into account a weighting factor g1 Zr1 is fed, and which is fed to the second motor controller R2, taking into account a weighting factor g2, as a tension control signal Zr2.
  • the tension control can be interfered with using the weighting factors g1, g2.
  • the tension regulator RZ receives the control signals RM1 ', RM2' as input signals, which correspond to the control signals RM1, RM2 to which the weighting factors w1, w2 act.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP19177061.9A 2019-05-28 2019-05-28 Procédé de réglage de traction d'une bande à imprimer, dispositif de réglage et dispositif de transport de bande à imprimer Withdrawn EP3744521A1 (fr)

Priority Applications (1)

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EP19177061.9A EP3744521A1 (fr) 2019-05-28 2019-05-28 Procédé de réglage de traction d'une bande à imprimer, dispositif de réglage et dispositif de transport de bande à imprimer

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EP19177061.9A EP3744521A1 (fr) 2019-05-28 2019-05-28 Procédé de réglage de traction d'une bande à imprimer, dispositif de réglage et dispositif de transport de bande à imprimer

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1701903A2 (fr) * 2003-12-22 2006-09-20 3M Innovative Properties Company Determination en temps reel de la tension de bande et dispositif de commande utilisant des capteurs de positions
US20070051264A1 (en) * 2005-09-07 2007-03-08 Dainippon Screen Mfg. Co., Ltd. Printing apparatus and method of tension control
US20070131036A1 (en) * 2005-12-09 2007-06-14 Stephan Schultze Method for determining a web tension

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1701903A2 (fr) * 2003-12-22 2006-09-20 3M Innovative Properties Company Determination en temps reel de la tension de bande et dispositif de commande utilisant des capteurs de positions
US20070051264A1 (en) * 2005-09-07 2007-03-08 Dainippon Screen Mfg. Co., Ltd. Printing apparatus and method of tension control
US20070131036A1 (en) * 2005-12-09 2007-06-14 Stephan Schultze Method for determining a web tension

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