DE102007020727A1 - Printing machine and method for operating a printing press - Google Patents

Abstract

The invention relates to a printing machine, in particular a sheet-fed printing press, with a plurality of printing units (10, 11, 12, 13), each printing unit having a forme cylinder (17), a transfer cylinder (15) rolling on the forme cylinder (17), 15) rolling counter-pressure cylinder (14), an inking unit (16) and preferably a dampening unit, and with a plurality of drives (19, 20), di in printing units, namely in a cylinder thereof, drive, each drive (19, 20) a associated with a separate drive controller, which generates based on a deviation between he the corresponding drive. According to the invention, at least one drive controller (22) is assigned a device (25) which generates a torsional vibration compensation variable during operation of the printing machine from at least one state variable of the drive control loop into which the respective drive controller (22) is integrated Torsional vibration compensation is valid.

Description

The The invention relates to a printing press, in particular a sheet-fed press, according to the preamble of claim 1. Furthermore the invention relates to a method for operating a printing press, in particular a sheet-fed printing machine, according to the Preamble of claim 7.

In a printing machine, such. As a sheet-fed press, is a Substrate moves through several printing units of the press, to print on the substrate. Every printing unit of a printing press has a form cylinder, one on the form cylinder rolling transfer cylinder, a on the transfer cylinder rolling counter-pressure cylinder and an inking unit and preferably a dampening unit. On the form cylinder at least one printing form is arranged, whereby form cylinder also be referred to as a plate cylinder. On the transfer cylinder is arranged at least one transmission form, wherein transfer cylinder Also referred to as rubber cylinder.

The The present invention relates to a printing machine having a plurality Printing units and with multiple drives, the drives in Drive printing units, namely into a cylinder of the printing units. Each drive of the printing press is a separate drive controller each drive together with the respective drive controller forms a drive control loop, and wherein the respective drive controller based on a deviation between a setpoint and an actual value a control signal for the corresponding drive of the drive control loop generated.

During operation of a printing press, the cylinders of the printing units can form the printing quality negatively influencing torsional vibrations. From the prior art, it is already known to compensate for such torsional vibrations on printing units of a printing press. So revealed the EP 1 202 147 B1 , a method for the compensation of torsional vibrations, in which with the help of harmonic balancing torques are compensated torsional vibrations. For this purpose, it is necessary to analyze in advance via a modal analysis of the printing press the vibration behavior of the same. This is complicated and expensive. There is therefore a need for a printing machine and a method for operating a printing press, in which or with which a torsional vibration compensation can be carried out with simpler means.

Of these, Based on the present invention, the problem is based a novel printing press and a novel method of operation to create a printing press.

This Problem is solved by a printing machine according to claim 1 solved. According to the invention is at least a controller associated with a device online during the operation of the printing machine from at least one state variable of the drive control loop, in which the respective drive controller is integrated is, generates a torsional vibration compensation quantity, the exclusively in this drive control loop for torsional vibration compensation is valid.

in the As used herein, the invention will be described during the operation of the printing machine from at least one state variable at least one drive control loop of the printing press for the drive controller of this drive control loop a Drehschwingungskompensationsgröße generated exclusively in this drive loop valid for torsional vibration compensation or used becomes. No modal analysis of the press is required for this.

Of Further, there is no spectrally differentiated harmonic compensation Compensation torques necessary. The invention is characterized by a high robustness and reliability in torsional vibration compensation out. The effort for a torsional vibration compensation is minimized with the present invention.

Preferably The device associated with a drive controller comprises a first Means to determine from the or each state quantity of the respective drive control loop to be compensated torsional vibration of the respective driven cylinder, and a second one Means for converting the detected torsional vibration to the torsional vibration compensation amount to generate for the respective drive control loop, wherein the first means and the second means associated with the drive controller Device each comprise at least one function, and wherein at least one parameter of these functions in the sense of an adaptation customizable online during operation of the printing press is.

The inventive method for operating a Printing machine is defined in claim 7.

preferred Further developments of the invention will become apparent from the dependent claims and the description below. Embodiments of the Invention are provided without being limited thereto explained in detail the drawing. Showing:

1 : a schematic representation of a sheet-fed press; and

2 : a printing unit of the sheet printing machine the 1 in greater detail.

Hereinafter, the present invention will be described with reference to FIG 1 to 2 described for a sheetfed press, the four printing units 10 . 11 . 12 and 13 includes. Each of the printing units 10 . 11 . 12 and 13 the sheet-fed press according to 1 an impression cylinder 14 , a transfer cylinder 15 , an inking unit 16 as well as a form cylinder 17 , In addition, each printing unit can also include a dampening unit.

Between the counter-pressure cylinders 14 two adjacent printing units 10 and 11 . 11 and 12 such as 12 and 13 is in the embodiment shown the 1 one transfer cylinder each 18 positioned to print substrate sheets between each printing units 10 . 11 . 12 and 13 to convict.

According to 1 the printing press has a main drive 19 on, being the main drive 19 in the impression cylinder 14 of the printing unit 10 one rubs. About the main drive 19 are all impression cylinders 14 , Transfer cylinder 15 as well as inking units 16 the printing works 10 . 11 . 12 and 13 as well as the transfer cylinders 18 drivable in the sense of a closed gear train. As 1 It is possible that in addition to the main drive 19 another main drive 19 ' is present to drive decentralized in the closed gear train.

According to 1 is every form cylinder 17 a separate direct drive 20 assigned to the forme cylinder 17 all printing works 10 . 11 . 12 and 13 drive on own motor. Every form cylinder 17 every printing unit 10 . 11 . 12 and 13 is via a clutch 21 from the closed gear train into which the impression cylinders 14 , the transfer cylinder 15 , the inking units 16 as well as the transfer cylinders 18 are integrated, uncoupled. The couplings 21 are therefore when the form cylinder 17 from their direct drives 20 powered by an engine, opened to the forme cylinder 17 on the drive side to decouple from the rest of the printing units or printing press.

2 shows details of the drive controls of the form cylinder 17 the printing works 10 . 11 . 12 and 13 by the same direct drives assigned 20 , So can 2 be taken that every direct drive 20 of every printing unit 10 . 11 . 12 respectively. 13 one drive controller each 22 assigned. The controller 22 generates a manipulated variable for the direct drive based on a control deviation between a setpoint and an actual value 20 of the printing unit. The actual value is preferably an actual position value of the direct drive 20 on driving cylinder 17 of the respective printing unit, wherein this position actual value of the forme cylinder 17 from a same assigned position encoder 23 provided. The desired value is preferably the position actual value of the with the forme cylinder 17 cooperating transfer cylinder 15 of the respective printing unit 10 . 11 . 12 respectively. 13 , This actual position of the transfer cylinder 15 from a same assigned position encoder 24 provided. A control deviation between this actual value and this setpoint is, as already mentioned, the drive controller 22 fed, the drive controller 22 Based on this control deviation, a control signal for the direct drive 20 of the forme cylinder 17 of the respective printing unit 10 . 11 . 12 respectively. 13 generated.

In order to ensure a torsional vibration compensation in such a printing press, the drive controller is proposed according to the invention 22 the direct drive 20 at least one printing unit, preferably the drive controller 22 the direct drive 20 every printing unit, a facility 25 assigned online during operation of the printing machine from at least one state variable of the corresponding drive control loop, in which the respective drive controller 22 is integrated, a Drehschwingungskompensationsgröße generated, which is used exclusively in this drive control loop for torsional vibration compensation or is valid for this drive control loop.

In the embodiment of 1 and 2 is every drive controller 22 every direct drive 20 of every printing unit 10 . 11 . 12 and 13 such a device 25 assigned, the one exclusively for the respective drive controller 22 valid torsional vibration compensation quantity generated.

In the exemplary embodiment shown, the state variable from which the torsional vibration compensation variable is generated online during operation serves as the actual value of the respective drive control loop, namely the actual position value of the corresponding forme cylinder 17 , At this point it should be noted that when a real leading axis of the printing press is present, in addition to or alternatively to the actual value of the respective drive control loop and the setpoint of the respective drive control loop, namely the actual position of the corresponding transfer cylinder 15 , can be used. Also, as a state quantity from which the torsional vibration compensation quantity is generated online during operation, a motor current or a motor rotational speed of the direct drive 20 or any other control technical state variable of the respective drive control loop are used.

The one each drive controller 22 every direct drive 20 associated device 25 Has a first means to get out of or each State variable of the respective drive control loop, here from the actual position value of the forme cylinder 17 , a torsional vibration of the driven forme cylinder to be compensated 17 to detect. Furthermore, this facility has 25 via a second means for generating from the detected torsional vibration the torsional vibration compensation variable for the respective drive control loop.

Each drive controller 22 is preferably designed as a cascaded controller from a current control, speed control and position control. The for the respective drive controller 22 with the help of the device 25 Generated torsional vibration compensation variable is in the current control, speed control and position control of the respective drive controller 22 available. Accordingly, the torsional vibration compensation variable can be a current variable, rotational speed variable or position variable which is acted upon as compensation variable of the current control, rotational speed control or position control.

According to an advantageous development, it is provided that the regulation according to the invention for torsional vibration compensation changes online during the operation of the printing machine in the sense of an adaptation. The first means and the second means of each drive controller 22 associated device 25 in each case comprises at least one function, wherein at least one parameter of these functions in the sense of an adaptation can be adapted online during the operation of the printing press.

The Adaptation can be based on the evaluation of an additional Criteria, such as B. a maximum following error or temporary lag error, at particularly interesting operating points, in order to do so accordingly adapted torsional vibration compensation quantities to generate. At the torsional vibration compensation quantities it is changeable over time Compensation amounts.

According to 1 and 2 accordingly takes place in the area of each printing unit 10 . 11 . 12 and 13 , each a direct drive 20 is assigned, independently of the other printing units online during operation of the printing press a torsional vibration compensation. This torsional vibration compensation is carried out using the already existing shaft encoder 23 . 24 the form cylinder 17 and transfer cylinders 15 the respective printing units.

With reference to 1 and 2 the invention has been described on the preferred embodiment of a sheet-fed press whose printing units direct drives 20 for the form cylinder 17 have the same. There is every drive controller 22 every direct drive 20 of each printing unit a device 25 assigned to the torsional vibration compensation, which for each controller 22 and thus individually generates a torsional vibration compensation quantity for each printing unit.

The above torsional vibration compensation is preferably on the direct drives 20 or the direct drives 20 assigned drive controller 22 limited. Alternatively, however, it is also possible on the or each main drive 19 . 19 ' the press to use this torsional vibration compensation, in which case the drive controllers of the main drives 19 . 19 ' a device for generating an individual torsional vibration compensation quantity is assigned.

The Invention can also be used with such printing machines, whose printing units have no direct drives, but exclusively includes several main drives.

10

printing unit

11

printing unit

12

printing unit

13

printing unit

14

Impression cylinder

15

transfer cylinder

16

inking

17

form cylinder

18

transfer cylinder

19 19 '

main drive

20

direct drive

21

clutch

22

drive controller

23

encoders

24

encoders

25

Facility

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1202147 B1 [0004]

Claims (9)

Printing machine, in particular sheet-fed printing machine, with a plurality of printing units, each printing unit having a forme cylinder, a transfer cylinder rolling on the forme cylinder, an impression cylinder rolling on the transfer cylinder, an inking unit and preferably a dampening unit, and having a plurality of drives in printing units, namely a cylinder the same drive, wherein each drive is assigned a separate drive controller, which generates a control signal for the corresponding drive based on a deviation between a setpoint and an actual value, characterized in that at least one drive controller ( 22 ) An institution ( 25 ) is assigned during online operation of the printing machine from at least one state variable of the drive control loop, in which the respective drive controller ( 22 ), generates a torsional vibration compensation quantity which is valid exclusively in this drive control loop for torsional vibration compensation. Printing machine according to claim 1, characterized in that the one drive controller ( 22 ) associated device ( 25 ) comprises first means for detecting from the or each state variable of the respective drive control loop a torsional vibration of the respective driven cylinder to be compensated, and in that the device ( 25 ) comprises second means for generating from the detected torsional vibration the torsional vibration compensation quantity for the respective drive control loop. Printing machine according to claim 2, characterized in that the first means and the second means of the drive controller ( 22 ) associated device ( 25 ) comprise at least one function, wherein at least one parameter of these functions in the sense of an adaptation online during the operation of the printing press is customizable. Printing machine according to one of claims 1 to 3, characterized in that it is designed as a sheet-fed press, wherein the same at least one main drive ( 19 ) to the transfer cylinder ( 15 ), the impression cylinders ( 14 ), the inking units ( 16 ) and preferably dampening units of the printing units, and wherein the forme cylinder ( 17 ) each printing unit in each case a direct drive ( 20 ) is assigned to the form cylinder ( 17 ) to drive the printing works on their own. Printing machine according to claim 4, characterized in that each drive controller ( 22 ) of a direct drive ( 20 ) An institution ( 25 ) is assigned to the torsional vibration compensation, wherein the a direct drive ( 20 ) assigned drive controllers ( 22 ) from the actual value of the corresponding drive control loop, in particular from a position actual value of the driven forme cylinder ( 17 ), and from the desired value of the corresponding drive control loop, in particular from a position actual value of the on the forme cylinder ( 17 ) rolling transfer cylinder ( 15 ), a control signal for the direct drive ( 20 ) of the forme cylinder ( 17 ), and wherein the device ( 25 ) for torsional vibration compensation from the or each state variable of the corresponding drive control loop, in particular from the actual position value and / or the position setpoint, generated online during the operation of the printing machine, the torsional vibration compensation quantity, which is valid exclusively in this drive control loop for torsional vibration compensation. Printing machine according to one of claims 1 to 5, characterized in that each drive controller ( 22 ) is a cascaded controller of a current control, speed control and position control, whereby the for the respective drive controller ( 22 ) generated torsional vibration compensation variable in the current control, speed control and position control is available. Method for operating a printing press, in particular a sheetfed press, with several printing units and several Drives, each printing unit a form cylinder, one on the Form cylinder rolling transfer cylinder, one on the impression cylinder rolling counter-pressure cylinder, an inking unit and preferably a dampening unit, wherein the Actuators in printing units, namely in a cylinder of the same, drive, and wherein each drive a separate drive controller assigned based on a deviation between a setpoint and an actual value is a control signal for the corresponding drive generated, characterized in that online during the Operation of the printing machine for at least one drive controller from at least one state variable of the drive control loop, in which the respective drive controller is integrated, a torsional vibration compensation quantity is generated exclusively in this drive loop is used for torsional vibration compensation. Method according to claim 7, characterized in that that from the or each state variable of respective drive control loop to be compensated torsional vibration of the respective driven cylinder is detected, wherein from the detected torsional vibration, the torsional vibration compensation quantity is generated for the respective drive control loop. A method according to claim 8, characterized in that at least one parameter of a function for detecting the torsional vibration to be compensated and / or a function to genes tion of the torsional vibration compensation variable in the sense of an adaptation online during operation of the printing press is adjusted.