• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for setting the machining position of at least one processing device (110, 120, 130, 140) not to be processed in a longitudinal register control in a processing machine (100), wherein the at least one processing device (110, 120 , 130, 140) is arranged in a path section which is delimited by two clamping points (102, 103), wherein the at least one processing device (110, 120, 130, 140) is acted upon by a control variable for adjusting the processing position in the context of precontrol wherein the manipulated variable for adjusting the machining position is calculated on the basis of a register deviation expected from a setting engagement of a traction control device (160, 161) for controlling the tensile force (Fi2) in the web section.
    公开号:AT511893A2
    申请号:T950/2012
    申请日:2012-08-30
    公开日:2013-03-15
    发明作者:Stephan Schultze；Mario Goeb；Holger Schnabel
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    Method for adjusting the machining surface of at least one machining device not clamping a machining web
    description
    The present invention relates to a method for adjusting the processing position of at least one processing device that does not clamp a material web to be processed.
    Although the invention is described below essentially with reference to digital printing machines, it is not limited to such an application, but rather usable in all types of processing machines in which the web is not clamped by the processing device during processing, ie substantially during the Machining no contact between processing device and web is made (eg digital printing with inkjet printing units, laser processing of a web, ...). No pinching in the sense of the invention always takes place when a change in the machining position of the machining device does not lead to a significant change in the web speed. Thus, the inventive method is, for example, also applicable to screen printing and other printing methods that do not form a nip with the web.
    State of the art
    The Applicant has numerous applications relating to a longitudinal register control in processing machines, in which the processing facilities are realized as terminal points and therefore there is a coupling between the longitudinal register and web tension. In this case, a correction of the processing position always leads to a "." # / ·. Λ · · * * · * · ·· iL! ···· ·· * * *
    Speed change of the web and thus to a change in the tensile force and vice versa.
    However, there are no solutions for the non-contact case on which no speed change occurs as a result of a longitudinal register control. However, a speed change occurs with a change in the web tension without simultaneously changing the machining position. The known methods for avoiding longitudinal register errors are not applicable here.
    It is therefore desirable to provide a method with which a register deviation as a result of a change in tensile force can be minimized or eliminated.
    Disclosure of the invention
    According to the invention, a method for adjusting the processing position of at least one processing device not clamping a material to be processed with the features of claim 1 is proposed. Advantageous embodiments are the subject of the dependent claims and the following description.
    Advantages of the invention
    The invention is advantageously realized in the context of a precontrol. Since a closed-loop control can only respond to disturbances, a register error (i.e., an incorrect processing position) must first occur before it can be corrected. On the other hand, a precontrol makes it possible that a register error does not even occur. This is particularly advantageous in view of the ever-increasing requirements with regard to accuracy, especially with regard to printed electronics. In the context of the invention, a method has been developed with which an expected register deviation can be calculated based on known process variables, so that the invention is particularly easy to implement.
    An arithmetic unit according to the invention, e.g. a control device of a printing press, is, in particular programmatically, adapted to perform a erfmdungsgemäßes method.
    Also, the implementation of the invention in the form of software is advantageous because this allows very low cost, especially if an executing processing unit is still used for other tasks and therefore already exists. Suitable data carriers for providing the computer program are, in particular, floppy disks, hard disks, flash memories, EEPROMs, CD-ROMs, DVDs and the like. It is also possible to download a program via computer networks (Internet, intranet, etc.).
    Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.
    It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.
    The invention is illustrated schematically by means of exemplary embodiments in the drawing and will be described in detail below with reference to the drawing. Detailed description
    FIG. 1 shows a non-contact working machine designed as a digital printing machine
    Processing machine, as they may be based on the invention.
    Figure 2 shows a section of a processing machine with two non-clamping processing device as a starting point for determining web speeds.
    FIG. 3 shows a scheme for the calculation of a process variable resulting from
    Register deviation.
    FIG. 1 schematically shows a processing machine 100, which can underlie the present invention. The processing machine 100 is designed as a digital printing machine with four digital printing units 110, 120, 130 and 140 for four-color printing. The • t · Λ Λ, ~ »· ·« «/ PA - * * ϊ * *«
    Digital printing units work without contact, in the present example via an ink jet method (inkjet).
    A web 101 is transported by driven transport devices 102, 103, 104 through the printing press. The transport devices are nip points, i. between them, the web 101 is clamped. The transport device 102 is driven at a speed vb the transport device 103 at a speed v2 and the transport device 104 at the speed v3. As a result, tensile forces F0i, Fi2, F23 and F34 are formed in the web between the transport facilities.
    For the control (in the closed loop) of the tensile forces F12 and F23, two traction control devices 160 and 161 are provided, which by appropriate change of velocities vlt v2 and v3, the actual tensile forces Fl2 and F23 to target tensile forces F! 2, Soi) and F23j should adjust. The actual tractive forces can be measured, for example, via load cells or via the drive torques at the transport devices. This is well known in the art. The traction control devices 160 and 161 are usually realized in a common computing unit, the so-called. Zugkraftregler.
    For the control (in the closed loop) of the longitudinal register (ie the relative processing positions in the material flow direction) longitudinal register control devices 180, 181 and 182 are provided, the processing positions of the digital printing units 120,130 and 140 in the material flow direction based on detected register deviations y] 2 (ie deviation of the register position between the printing unit 110 and 120), y! 3 (ie deviation of the register position between the printing unit 110 and 130) and y14 (ie deviation of the register position between the printing unit 110 and 140) in order to align it relative to the processing position of the digital printing unit 110. Likewise, other reference color controls are possible, such as e.g. Control of register deviations yi4) y24, and y34 (digital printing unit 140 is the reference printing unit, in which case the longitudinal register controller 182 would correct the digital printing unit 110). Furthermore, detection and control of the registers as the predecessor color control, i. a regulation of the registers yi2, y23, y34 possible.
    For detecting the register deviations y! 2 and / or the processing positions, one or more corresponding sensors 170 (for example (color) brand sensor, camera) are provided, which are
    Ml, for example, record printed register marks. This is well known in the art. For register correction, the longitudinal register control device 180 adjusts the processing position of the printing unit 120, the longitudinal register control device 181, the processing position of the printing unit 130 and the longitudinal register control device 182 the processing position of the printing unit 130 in a manner well known in the art. This is to ensure that the individual images printed by the printing units lie correctly on top of each other. The longitudinal register control devices 180, 181 and 182 are often implemented in a common arithmetic unit, the so-called register controller. The register controller may, for example, also be implemented in the sensor 170.
    Even tension controller and register controller can be implemented in a common processing unit.
    For example, there is a dryer 150 between the transporting devices 103 and 104 for drying the sprayed-on paint.
    To describe the invention, reference will be made below to the web section with the tensile force F) 2. The control of the web tension can be effected by control actions on the front transport device 102 and / or on the rear transport device 103. In this case, a fine adjustment (corresponds to a change in the ratio between the drive - usually the electric motor - and the transport device and thus a percentage change in speed) is usually adjusted as a control intervention, which leads to a change in the speed at the controlled transport device.
    If the tension regulator makes an adjustment, the speed of at least one of the two clamping points is changed. This leads to a change in the speed profile among the printing units, which in turn has an effect on the longitudinal register and leads to waste. To avoid waste, within the scope of the invention, the individual printing units 120, 130, 140 are precontrolled such that a change in the velocity profile does not lead to a change in the register. In contrast to jammed printing units, it is not possible to adjust non-clamping printing units without this having an effect on the speed of the material web. * * * # * * * * * * ♦ * ♦ * * * * # * > ·········································. Λ Λ, + * · ♦ ··· ** θ / · ίΖ ··· ·· ····
    In the following, it will be explained with reference to FIG. 2 how a speed change affects the register. FIG. 2 shows a path section which is delimited by two clamping points 202, 203 at the speed v (0, s) and v (L, s), respectively. The length of the web 101 between the nips is L. The web runs with an elongation eo (s) in the considered track section.
    Furthermore, there are two printing units 210, 220 at the positions x, or x2. The distance between the printing units is x2 - Xi. The two printing units spray paint onto the web. The web 101 has a web speed v (x1 (s) and v (x2, s) immediately below the printing units.) The processing speed is v ^ s) or v2 (s); This is essentially defined by the time span between two print lines.
    For non-pinching printing units a matching web and processing speed is not given per se. The location-dependent and time-dependent speed of a free web rather results independently of the processing speed in a purely elastic web behavior - without climatic dependencies - by the following description: Lx - x s ..... l + s · - V (X, S) = -ϊ ~ - (ν (0.5) -ν · £ 0 (5)) + - l + j · - l + s · -
    V v
    Combining the linear elongation behavior of the web with known equations of registration error results in register error y for non-clamping printing units as a function of the peripheral speeds of the limiting clamping points v (0, s) and v (L, s), the elongation entering the web section eo (s) (this results, for example, from tensile force and cross-section) and the processing speeds v ^ s) or v2 (s) to: • .sriui
    S · iL> s) 1 L-x. l + s-1 1 L 1 + Ä · - VL - x, i_sl + s ~ 2: 0) - 1 1 + 5 · - (V (°, s) -V50 (s)) - * - jv (L, s)
    1 +5 · - V
    For further details on the derivation, reference is made to the publication "Web Traction Force and Register Correlation on Machines with Non Impact Printing", M. Göb, H. Schnabel, S. Schultze, SPS / IPC / DRIVES 2011, Nuremberg.
    This results in the context shown schematically in Figure 3, from which a resulting register deviation yXiiX2 can be determined, i. a distance by which the print image of the printing unit at the position X] is shifted relative to the print image of the printing unit at the position X2. Lol designates the length L, L12 the distance between xi and x2 and v an unchanged speed (corresponds to a "DC component" of the speed or the unchanged master axis speed),
    In order to avoid this register deviation within the scope of the invention, for example, the printing unit is pre-controlled at the position x2 such that its processing position is adjusted by the expected register error Δχ = yxliX2. In a simple embodiment, this can take place in that the pressure is offset (sooner or later) by a certain amount of time. As a result, the pressure position (processing position) on the material web, for example, is changed by the desired distance Δχ.
    It will be appreciated that the register error yxliX2 may be calculated based on the quantities vi (s), v2 (s), v (0, s), v (L, s) and eo (s) commonly known in machine control are or at least can be easily determined. Furthermore, the register error is dependent on the positions xi and x2 and the free web length L between the nips. These sizes are usually constant in the printing process and also easily determinable. The feedforward control according to the invention can therefore be implemented particularly easily.
    According to a particularly preferred embodiment of the invention, the following steps are carried out.
    In the course of normal machine operation, it comes to control actions of the draft regulator, tim adjust the actual tensile force to a predetermined target tensile force. For this purpose, the web tension controller calculates a manipulated variable, for example a fine adjustment, with which the speed of the upstream and / or the downstream transport device is changed.
    One cause of a change in the tensile force is in particular a change in the modulus of elasticity. This may be due to a change in the amount of moisture introduced, for example due to a change in the printed image, also on-the-fly.
    The speed change of the controlled transport device is taken into account and it is preferably calculated according to the above-described analytical model of the resulting register error for the respective printing units. It has been found that the control of the upstream transport device is advantageous, since upon adjustment of the incoming nip only a dynamic register error occurs that is self-compensating (i.e., self-degrading).
    The calculated expected register error is added inversely as a feedforward control to the respective printing units additively, whereby an actual occurrence of the register error is counteracted. The pre-controlled manipulated variable can be a distance Ax, around which the printed image to be applied is shifted. This information can be transmitted over any bus (e.g., Ethernet) or over a real-time bus (e.g., Sercos 3). Furthermore, the shift of the printed image can be done via a Geberemulation. In digital printing, it is common to control the actuation of the print nozzles based on a high accuracy machine speed / angle (e.g., master axis position). The transmission of the machine speed is read in, for example, in the prior art by means of incremental encoder signals (via an encoder mounted on a transport device of the machine or via an emulator signal emulated based on a machine angle) from the printing unit drive. For example, if the emulated machine angle transmitted to a first printing unit 210 is shifted by an angle with respect to the emulated machine angle transmitted to a second printing unit 220, the printed images on the web are shifted. Furthermore, the • · »· ητ / 1Τ &gt; · · * • ir; WZr «<i» ·
    Encoder information - as published in DE 10 2010 044 645 - are transmitted via a real-time bus. Alternatively, the control (outputs of controllers 180, 181, 182) may not be via the adjustment of a transmitted machine position, but via a transfer of an additive printing unit angle to be pre-outserted via a standard communication system, such as an Ethernet link, between a machine controller and the digital printer engine respectively.
    Then the process starts again from the.
    A preferred embodiment of the invention, in addition to the change in the situation also includes a change in the length of the printed image. A change in the web speed at the location of a printing unit means that the image to be applied must be applied in a shorter or longer time if the printing length is not to change. For this reason, a change in the speed profile (due to a tension control intervention, for example, in response to a changing modulus of elasticity and, as a result, a speed change at one of the clamping points) affects the length of the printed image. As explained above, the web speed resulting therefrom at the location of the printing unit can be determined, so that the expected change in printing length can be determined. This Dmcklängenänderung can be counteracted by controlling the printing unit, for example, by the time period between two lines of pressure is affected. This may also be transmitted over any bus (e.g., Ethernet) or over a real-time bus (e.g., Sercos 3). Furthermore, the shift of the printed image can be done via a Geberemulation.
    权利要求:
    Claims (12)
    [1]
    * .. * - "ίο / .Λ" .. * .. * ΡΑ ~ Γ £ λ; Τ Claims 1. Method for adjusting the machining position of at least one processing device (110, 120, 130, 140) not clamping a material web (101) to be processed in the context of a longitudinal register control in a processing machine (100), wherein the at least one processing device (110, 120, 130, 140) is arranged in a path section bounded by two clamping points (102, 103, 202, 203), wherein the at least one processing device (110, 120, 130, 140) is acted upon in the context of a control with a manipulated variable for setting the processing position, wherein the manipulated variable for setting the processing position based on a from a control intervention of a traction control device (160, 161) for control the tensile force (F12) in the web section resulting register deviation (yxiiX2) is calculated.
    [2]
    2. Method according to claim 1, wherein the manipulated variable is calculated from a speed (v (0, s), v (L, s)) of the two clamping points (102, 103, 202, 203) and an elongation of the material web (101).
    [3]
    3. The method of claim 1 or 2, wherein the manipulated variable from a speed (V [(s), v2 (s)) of the at least one processing device (110, 120, 130, 140) is calculated.
    [4]
    4. The method according to any one of the preceding claims, wherein the manipulated variable of positions (x1, x2, 0, L) of the at least one processing device (110, 120, 130, 140) and the two nips is calculated.
    [5]
    5. The method according to any one of the preceding claims, wherein the at least one processing means (110, 120,130, 140) is applied to the manipulated variable to move the processing position by a distance corresponding to the expected register deviation (y * i.x2).




    [6]
    6. The method according to any one of the preceding claims, wherein additionally a processing length of the at least one processing device (110,120, 130,140) is set, wherein the at least one processing device (110, 120, 130, 140) in the context of a feedforward control with a manipulated variable for adjusting the processing length 5, wherein the manipulated variable for setting the machining length is calculated on the basis of a speed change expected from a setting engagement of a traction control means (160, 161) for controlling the traction force (F12) in the web section.
    [7]
    7. The method according to any one of the preceding claims, wherein the manipulated variable is transmitted via a 10 bus connection to the at least one processing device (110, 120, 130, 140).
    [8]
    8. The method according to any one of the preceding claims, wherein the manipulated variable is generated as the output of a Geberemulation. 15
    [9]
    9. Method according to one of the preceding claims, wherein the precontrol takes place precisely when a process variable changes,
    [10]
    10. The method according to any one of the preceding claims in a digital printing machine 20 (100) as a processing machine with at least one inkjet printing unit (110, 120, 130, 140) as a processing device.
    [11]
    11. The method according to any one of the preceding claims in a processing machine with at least one laser processing device.


    [12]
    12. arithmetic unit which is adapted to perform a method according to any one of the preceding claims. Aug. 0, 2012 25
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    法律状态:
    2016-01-15| REJ| Rejection|Effective date: 20160115 |
    2016-05-15| REJ| Rejection|Effective date: 20160515 |
    优先权:
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    DE102011112116A|DE102011112116A1|2011-09-02|2011-09-02|Method for adjusting processing position of material web in e.g. digital inkjet printing machine, involves controlling resultant force in web section based on control variable for adjusting processing position of material web|
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