• 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 adjusting the web tension in a processing machine (10) for processing a web (101), in particular a shaftless printing machine, wherein for adjusting the web tension in a first, by a first nip (3) upstream and a second nip (4). downstream of the web tension section (34) of a length L (l34), the first nip (3) is acted on by a first manipulated variable (v3) generated using a first link (133) having a first transfer function G1 (s) (G3) is applied, and the second nip (4) with a second manipulated variable (v4), which is generated using a second member (134) having a second transfer function G2 (s) (G4), characterized in that: c1 G1 (s) = -c2 G2 (s). With the invention it is possible, at a fixed or variable point x within the web tension section (34), to keep the speed constant even during the control, where x = | c1 / (c1 + c2) | L is behind the first nip (3).
    公开号:AT511027A2
    申请号:T16142011
    申请日:2011-11-02
    公开日:2012-08-15
    发明作者:Holger Schnabel；Stephan Schultze；Mario Goeb
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    * ·
    Method for web tension detection
    description
    The present invention relates to a method for web tension adjustment in a processing machine.
    Although the invention is described below essentially with reference to printing presses, it is not limited to such an application, but rather can be used in all types of processing machines in which a tension of a web or web of material is to be determined. The web can be made of paper, cloth, cardboard, plastic, metal, rubber, in foil form, etc.
    State of the art
    In processing machines, in particular printing machines, a web of material along driven axes (Balmtransportachsen), such. Pull rolls or feed rolls, and non-driven axes, such as e.g. Deflection, guide, drying or cooling rollers, moved. The web is simultaneously processed by usually also driven processing axes, for example. Printed, stamped, cut, folded, etc.
    The web tension of the web is, for example, via so-called. Clamp set influenced that pinch the web positive or non-positive. These are usually driven transport or processing plants. In a gravure printing machine, a nip is usually formed by a printing unit, in which a frictional unit between the driven pressure cylinder, the impression roller and the material web consists. The web is divided into web tension sections, wherein a Bahnspannungsabschnitl is limited by two terminal points. Within a web tension section further * · · · * · · · · · · · · · b · · -.2 / 12:, driven and / or non-driven axles may be arranged. Often, the entire web is divided into several web tension sections, sometimes with different web tension setpoints. In order to maintain the setpoints, usually a web tension control is used.
    The adjustment or regulation of the web tension of a web tension section can be effected by different methods. Downstream means that the terminal point limiting the web tension section downstream is adjusted, upstream means that the clamping point limiting the web tension section upstream is adjusted. In this simple embodiment, however, the web tension in leading and / or subsequent web tension sections is not decoupled from the positioning movement. Rather, the change in the web tension following the web course is transported through the machine and is ausuregcln in all subsequent sections. In addition to this indirect disturbance due to the transport of the material web, a direct disturbance due to the adjusting movement is to be found in the web section adjoining the displaced clamping station.
    It is possible, in a downstream control by means of a (dynamic) downstream pilot control, to control all subsequent clamping parts in such a way that they directly compensate for the effects of the leading clamping point. As a result, it is ensured that all subsequent web tension controllers do not have to compensate for the disturbances of the positioning movement and the coupling through the mattress web. DE 10 2008 056 132 A1 proposes a decoupling for an upstream control, wherein in addition to a (constant) upstream pre-control, a (dynamic) downstream pre-control by means of a PT1 element is also carried out. DE 10 2009 016 206 A1 discloses a method with decoupling implemented exclusively in the upstream direction. In this case, a combination of a feedforward control weighted in the upstream direction by a DT | -component and a control weighted by a negative PT, -Glied only the rear bounding nip disclosed. The indications " before " and " behind " A nip or web portion refers to the transport direction of the web, i.e., the web. the
    Web course «4 • * 4 ·« • · • *
    All known decoupling strategies have the disadvantage that siel) changes the web speed within the web sections. But since, for example, in digital printing, the printheads are located within a track section and not directly on a small ms parts, resulting in the sequence each adjusting movement during the regulation of the web tension to a material web speed change and therefore to a register error.
    It is therefore desirable to provide a method for adjusting the web tension in a processing machine, in which the web speed can be kept constant or selectively changed at any point within a web tension section during decoupling.
    Disclosure of the invention
    According to the invention, a method for adjusting the web tension in a processing machine having the features of patent claim 1 is proposed. Advantageous embodiments are the subject of the dependent claims and the following description.
    Advantages of the invention
    The invention makes substantial use of the knowledge that the web speed can be predetermined at any desired point within a web tension section with a length L bounded downstream by a first nip and downstream with a length L during a web transporting process (for example, kept constant or can be selectively changed ), if the manipulated variable output by the control is applied in a certain way to both clamp points. For this purpose, the manipulated variable is in each case guided via a link, wherein the transfer function of one of the links is the negative of the transfer function of the other of the links. The location within the web tension section at which the web speed is specified is set via the factors of the links. The length L is aufgcteilt in this sense in the ratio of the pre-factors. The invention makes it possible to predetermine the web speed at any point within the web tension section during a web tension control. If the links are time-dependent, the location may be
    A point of constant speed can be varied, the links are constant, this is also the point of constant web speed.
    Moreover, the invention can be particularly easily implemented in practice. In particular, it may be based on control structures as known in the art and described in the introduction. In the context of this invention, reference is expressly made to the control structures according to DE 10 2008 056 132 A1 and DE 10 2009 016 206 A1. The combination of the present invention with these regulatory structures is expressly referred to as particularly preferred export form of the invention. This can be done decoupling further sections.
    Starting from an existing control structure, a control structure according to the invention can be obtained by a simple mathematical combination (for example by addition, subtraction, multiplication or division) with a static or dynamic member, so that, as a result, the members for the clamping points of the material web segment of interest fulfill the conditions according to the invention. A dynamic link has a non-constant transfer function. A non-constant transfer function is any transfer function that does not have the form G (s) ~ k, but instead exhibits a dependence on s. For example, a D, 1, PI, PID, PT1. DT1, PTn, DTn member each have a non-constant transfer function, whereas a P-member has a constant transfer function. Members with a non-constant transfer function are referred to as dynamic members in this application, whereas members with a constant transfer function are called static members.
    An arithmetic unit according to the invention, e.g. a control unit of a printing press is, in particular programmatically, set up to drive a method according to the invention.
    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 devices. ··. * '·· *
    Memory, 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.
    figure description
    Figure 1 shows a schematic representation of a generalized Rcgelungsstruktur for decoupled control of the web tension for a Bablspannungsabschnitt.
    FIG. 1 describes a generalized control structure for the decoupled regulation of the web volume for a web tension section in a printing press. A schematic section of a printing press 10 is shown, in which a material web 101 is transported and processed by five clamping points formed here as printing units 1 to 5. Between each two adjacent clamping points, a web tension section is formed. For example, a web tension section 12 is bounded by the printing units 1 and 2, a web tension section 23 through the printing units 2 and 3, a web tension section 34 through the printing units 3 and 4 and a web tension section 45 through the printing units 4 and 5. The printing machine also has here as load cells 121 to 124 formed web tension sensors for determining the web tension or the tensile force in the respective web tension sections. The determination of the respective Bahnspamuingen can also be done by other methods than by measurement, for example, in DE 10 2005 058 810 Λ1 an alternative method is published. In the illustration shown, the web tension is influenced by influencing the peripheral velocities V | to •> δ. ' 13. ν5 of the printing units 1 to 5 set. In principle, the web tension can be adjusted by means of angular adjustment, speed control and / or limitation of the drive torque of at least one clamping point delimiting this web tension section.
    The physical parameters, namely the length /, the elongation ε and the web tension or tensile force F of the individual web tension sections are also indicated in the figure with corresponding indices.
    To control the web tension, a control deviation e is fed to a control element 140, for example a PI controller, which calculates a manipulated variable therefrom. This manipulated variable acts via individual members 131 to 135 with associated transfer functions G1 to G5 to the peripheral speeds v] to v3. The terms 131 to 135 may be zero (ie G - 0), but also P, I, D, PTi, PT2, PT ", DT, DT3, DTn, etc act with the known associated transfer functions. The elements 131 to 135 and 140 are expediently implemented in a computing unit.
    Below, basic examples of web tension control in section 34 will be described. The control deviation e is determined in this case from a comparison of the actual value E'34 with a desired value. The following control and decoupling strategies are known: (1) upstream control: Gl = 0, G2 = 0, G3 = 1, G4 = 0, G5 = 0 (2) Downstream control: Gl = 0, G2 = 0, G3 = 0, G4 = 1, G5 = 0 (3) upstream control with upstream decoupling: G1 = 1, G2 = 1, G3 = 1, G4 = 0, G5 = 0 (4) upstream control with upstream and downstream Downstream decoupling: Gi = 1, G2 ~ 1, G3 = I, G4 = 0, G5 = PT1 (5) Downstream control with downstream decoupling: Gl = 0, G2 = 0, G3 = 0, G4 = 1, G5 = DT1 * · • ·
    With these control strategies, it is not possible to keep the web speed constant at any point in section 34. Rather, either the speed v2 or the speed v.i remains constant.
    In order to achieve this aim, in the context of the invention, the two elements involved, in order to remain in the above example G3 and G4, are chosen such that: c, G3 = -c2 G4
    The respective signs result from the sense of control. Increasing the speed v3 of the front nip 3 causes a reduction in the web tension, and conversely, increasing the speed vA of the rear nip 4 causes the web tension to increase. A weighted combination of increasing and decreasing the velocities vr and v4 can be used to influence the constant velocity point, where the ratio C] / (ci + c2) is the point x behind nip 3, at which the velocity remains constant, according to x = | ci / (c [+ C2) | I34 determined.
    Zwischckmäßigerwcise becomes | c, + c2 | = 1, then x = | cjj
    The invention enables the targeted specification of the web speed. If the terms C and c2 are not time-dependent, the web speed is constant at point x. By specifying time-dependent terms C) and c2, i. c ((t) and c2 (t), it can be achieved that the point x of constant web speed travels through the web tension section and / or a targeted change in the web speed is achieved at the original point x.
    For example, G3 = 1/2 and G4 = -1 / 2 can be chosen, where then x lies exactly in the middle between 3 and 4. The signs indicate a negative control sense, i. if the control value is positive, the web tension decreases.
    The known decoupling strategies can be easily maintained, i. the web tension control of one section still does not affect other sections if G3 = 1/2 and G4 = -1 / 2 are obtainable from the known scheme by linking (eg, addition, subtraction, multiplication or division) of a link. For example, the upstream control discussed above with upstream and downstream; & / U <
    Decoupling (4) (G1 = 1, G2 = 1, G3 = 1, G4 = 0, G5 = PT1) can be easily redesigned according to the invention by subtracting a term G = 1/2. One then obtains a preferred upstream control with upstream and downstream decoupling at a constant speed in the middle between 3 and 4 according to:
    G1 = 1/2, G2 = 1/2, G3 - 1/2, G4 = -1 / 2, GS = PT1-1 / 2.
    If it is intended that the constant velocity point x lies 0.9 / ¾ behind 3, G3 = 0.9 and G4 = -0, i to choose. This results, for example, from (4) by subtracting G = 0, 1 to:
    Gl = 0.9, G2 = 0.9, G3 = 0.9, G4 = -0.1, G5 = PTl-0.1.
    From the downstream control with downstream decoupling (5) (G1 = 0, G2 = 0, G3 = 0, G4 = 1, G5 = DT1) one obtains by subtracting G = 1/2 and then multiplying by G = - 1:
    G1 = 1/2, G2 = 1/2, G3 = 1/2, G4 = -1 / 2, G5 = 1/2-DT1.
    It should be noted that the web tension portion to be controlled need not be the web tension portion in which a constant speed is desired. For example, it is known from DE 10 2009 016 206 A1: G1 = DT1, G2 = DT1, G3 = DT1, G4 = -PT1, G5 = 0. This is obtained by adding G = 1/2 PT1:
    Gl - DT1 + 1/2 PT1, G2 = DT 1 + 1/2 PT1, G3 = DT1 + 1/2 PT1, G4 = -1/2 PT1, G5 = 1/2 PT1, so now the position of the constant Speed is in the middle between 4 and 5.
    The invention offers the advantage that over a difference control, i. simultaneous control of both clamping points, in combination with a modified pilot control of the clamping points all Materialbahnabschnilte can be decoupled controlled and at the same time the Maleriabahngeschwindigkeit at any position of the system (for example, digital printhead) does not depend on the regulation and decoupling. Depending on the selected control method of the individual track sections (up, down or differential control) and the part-line dynamics, the pilot controls of the Klennnstelien be weighted or ungeiehtet and executed dynamically with the appropriate line time constants or static. The dynamic pre-control of all terminal points can be done with one or more combined dynamic timers. These may be P, I, D, PT, PTI, PT ", DT, DT2, □ '", ..., and dead times. It can be one or more
    Terminal points are acted upon with this dynamic decoupling. The feedforward controls can also be statically weighted here.
    Infeed unit and unwinder 5 can also be included in the taxation in upstream processing; extracting unit and rewinder can also be included in the feedforward control in the downstream direction.
    These decoupling strategies illustrated in the invention apply to the regulation of force, web tension and elongation. Thus, the input values for the control can also be the actual load, the actual web tension and / or the actual strain. Furthermore, a control and / or precontrol would be conceivable by reconstructed by observers sizes.
    Furthermore, the control variables of the members 131 to 135, which act on the speeds v, to v5, can be combined with control variables of web tension control of further web sections 15. In the above description, a control with measurement in the web section 34 has been described. If there are also other web tension controls, e.g. with measurement in the web sections 12, 23 and 45, their control variables are added to the speeds vj to v5.
    权利要求:
    Claims (12)
    [1]
    Claims 1. A method for adjusting web tension in a processing machine (10) for processing a web (101), in particular a shaftless printing machine, wherein for adjusting the web tension in a first, by a first nip (3) upstream and a second nip (4) downstream web tension section (34) having a length L, the first nip (3) is acted upon by a first manipulated variable (vj) generated using a first link (133) having a first transfer function Gi (s) (G3) is applied, and the second nip (4) is applied to a second manipulated variable (vj), which is generated using a second member (134) having a second transfer function G2 (s) (G4), characterized in that c, G, (s) = -c2 G2 (s); wherein a position x within the web tension section (34) at which the velocity is kept constant is a length x = | ci / (ci + c2) | L is behind the first Kiemmstelle (3).
    [2]
    2. The method of claim 1, wherein | ci + c2 | = 1.
    [3]
    A method according to any one of the preceding claims, wherein the first member (133) and the second member (134) are obtained by mathematically linking a control structure to a static or dynamic member.
    [4]
    4. The method according to any one of the preceding claims, wherein the first manipulated variable (v ) Using the first member (133) and the second manipulated variable (v7) are generated using the second member (134) from one and the same controller output variable.
    [5]
    5. The method of claim 4, wherein at least a third, in the web before the first Kiemmstelle (3) located Kiemmstelle (1,2) with a third manipulated variable (vl7 v2) is applied, which by using a third member (131, 132 ) is also produced from the Reglcrausgangsgröße. i 1 / J2 .- *
    [6]
    6. The method according to claims 3 and 5, wherein also the third member (131, 132) is obtained by mathematically linking the control structure with the static or dynamic member.
    [7]
    7. The method of claim 4, 5 or 6, wherein at least a fourth, in the web path behind the second nip (4) located nip (5) is acted upon by a fourth manipulated variable (v5), which by using a fourth member (135) also is generated from the controller output.
    [8]
    8. The method according to claims 3 and 7, wherein also the fourth member (135) is obtained by mathematically linking the Rcgelungsstruktur with the static or dynamic member.
    [9]
    A method according to any one of the preceding claims, wherein the first member (133) and the second member (134) are a proportional member or a PTi member.
    [10]
    10. The method according to any one of the preceding claims, wherein Ci and c2 are each time-independent, cI; qj! I IR, so that x is independent of ccit.
    [11]
    11. The method according to any one of claims 1 to 9, wherein Ci and c2 are each time-dependent, so that also x is time-dependent.
    [12]
    12. Arithmetic unit which is set up to carry out a method according to one of the preceding claims,

    02. K'ov, 2011
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    同族专利:
    公开号 | 公开日
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    DE102011014074A1|2012-02-16|
    US20120211581A1|2012-08-23|
    US9010603B2|2015-04-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE10335886B4|2003-08-06|2013-12-19|Manroland Web Systems Gmbh|Method and apparatus for controlling a total cut register error of a rotary press|
    DE10335885A1|2003-08-06|2005-03-17|Man Roland Druckmaschinen Ag|Method and device for regulating the web tension and the cutting register error of a web-fed rotary printing press|
    DE102005058810A1|2005-12-09|2007-06-14|Bosch Rexroth Ag|Method for determining a web tension|
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    法律状态:
    2016-05-15| REJ| Rejection|Effective date: 20160515 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011007989|2011-01-04|
    DE201110014074|DE102011014074A1|2011-01-04|2011-03-16|Method for setting web tension in shaftless printing machine, involves adjusting web tension and satisfying specific relation fixed or floating point to be kept constant within web tension and speed during control|
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