GB2261629A - Drive for a printing press with a plurality of printing units - Google Patents

Drive for a printing press with a plurality of printing units Download PDF

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Publication number
GB2261629A
GB2261629A GB9221398A GB9221398A GB2261629A GB 2261629 A GB2261629 A GB 2261629A GB 9221398 A GB9221398 A GB 9221398A GB 9221398 A GB9221398 A GB 9221398A GB 2261629 A GB2261629 A GB 2261629A
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GB
United Kingdom
Prior art keywords
printing
angle
unit
units
rotation
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.)
Granted
Application number
GB9221398A
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GB2261629B (en
GB9221398D0 (en
Inventor
Bertold Gruetzmacher
Anton Rodi
Bernhard Wagensommer
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen 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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of GB9221398D0 publication Critical patent/GB9221398D0/en
Publication of GB2261629A publication Critical patent/GB2261629A/en
Application granted granted Critical
Publication of GB2261629B publication Critical patent/GB2261629B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/70—Driving devices associated with particular installations or situations
    • B41P2213/73—Driving devices for multicolour presses
    • B41P2213/734—Driving devices for multicolour presses each printing unit being driven by its own electric motor, i.e. electric shaft

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

The invention relates to a multiple drive for a printing press with a plurality of printing units. The units are mechanically separate and are driven by individual motors. The drive is of such design that sheet transfer between the individual printing units is synchronized, and takes place with the units being in defined positions. The object of the invention is achieved in that a device for angle feedback control is provided, said device dimensioning the permissible angle-of-rotation deviation phi to1 of the individual printing units (1) or printing-unit groups from a preselected angle setpoint value phi set point such that said deviation is minimal at least in the angle-of-rotation position in which sheet transfer takes place. <IMAGE>

Description

. --- j '- Drive for a printing press with a pluralilty of printing units
The invention relates to a multiple drive for a prin-1k-inc press with a plurality of printing units according to the definina clause of the main claim.
In the field of printing, there are de.mands both for rationalization and also for an improvement in quality. In order to produce high-quality multi-colour prints that are printed on both sides and possibly also varnished in one passage through the printing press, it is necessary, particularly in sheet-fed of-Efset printing, to dispose a multiplicity O:E printing units one behind the other. Such printing units must bez highly coordinated with respect to their mode of operation.
In order to guarantee the latter, the fmpression cylinders of the individual printing unlits usually mesh with the transfer drum disposed between two printing units and form a closed gear train. Throuah one or more motors, the power is fed into the gear train at one or more points.
It becomes apparent in practice that, civen an ident-ical press speed, the greater the number of mechanically - L. - interconnected printing units, the greater is the tendency c--- a printing press to vibrate. Such vibrations result in mackling in the printed image, which has a negative effect on the quality of the printed product.
In order to obviate the disadvantages arising from the rigid connection of the printing units, a drive on a multi-colcur printing press has already become known in which the individual mechanically decoupled printing units or printing- unit groups are each driven by a separate drive.motor. The synchronization of the printing units is achieved in this case no longer by the rigid gear train, but by the electrical synchronization of the individual drive motors.
One possible way of accomplishing such synchronization is descr.'-ed in DE 35 03 178 Al. In order to ensure compliance with the control ledmovement. conditions and thus to ensure the safeguarding of the quality parameters and the reduction of consequential damage through operator errors or mishaps, the aforementioned publication describes a process for the Caital feedback control of n parallel -connected drives: each ofE the n drives is associated with a subsidiary setpoint generator which determines the time- ol state-dependent movement relationship of the drive and supplies the J n'.
drive-specific setpoint values. The subsidiary setpo- generators are subordinate to a master setpoint generator, which processes all the influencing variables. For the dynamic monitoring of tChe drives, the difference between the largest and smallest deviations of the n drives is constantly formed and compared with a maximum permissible difference. If the difference exceeds the value specified by the master setpoint generator, then, while maintaining the mutual movement relationship, the speed level of all drives is lowered to the specified limit according to any desired functional relationship.
The aim of this process is, at all times, to minimize the angular difference between the individual drives. Both the control parameters and also the control structure are thus independent of the p,--ase angles of the printing units.
3 - The object of the invention is to create a multiple drive for a printing press with a plurality of printing units, said drive being of such design that sheet transfer between the individual printing units is synchronized.
The object of the invention is achieved by the characterizing part of the main claim.
The drive according to the invention guaran4Cees a very high repeat. accuracy with regard to sheet transfer. This is of great importance in sheet-fed offset printing, since irregularities in sheet transfer result in macklinc: and thus in colour displacements, which have an extremely negative effect on the quality Of the printed products.
According zo a further development of 1Che drive according to the invention, it is provided that the permissible angle-of-rota4L--icn deviation of the individual printing units or printing-unit groups from a angle setpoint value exhibits a preselecit Lpreselectable dependence on the angular position of the printing u----it or printing-unit group. It is provided, in particuar, that the permissible anale-of-rotation deviation;,;ithin a preselectable range about the angleof-rotatic.n position in which sheet transfer takes place is smaller than at angle-of-rotation positions outside said range.
According to the invention, the drive is of such a design that the cylinders of the individual printing units or Printing-unit groups have a precisely defined angular position at sheet transfer in order to prevent the aforementioned mackling effects. However, also - 4 within specified limits Outside this sheet-transfer range, a specified permissible angle-of-rotation deviation must not be exceeded, because, otherwise, there might be gripper collisions between the gripper bridges of the impression cylinders and those of the transfer cylinders. Outside this critical range about the defined angular position at sheet transfer, the requirements in terms of the permissible angle-ofrotation deviations of the individual printing units or printing-unit groups are less stringent.
0 the drive According-t-o an advantageous embodiment of according to the invention, it is provided that, for the synchronization of the printing units or Printing-unit groups, the same angle setpoint is specified for each drive motor. This variant has the advantage that any deviations from the angle setpoint are compensated at the point at which they occur.
An alternative embodiment provides that, -'--or the synchronization of the printing units or Printing-unit groups, an angle setpoint is specified for a selected drive motor and that the next drive motor receives as its setpoint the actual value of the preceding drive motor.
The drive according to the invention is based on the notion not of correcting angular differences at each angular position or at each point in time, but of monitoring them so that a correct sheet transfer is achieved. The aim, furthermore, is to prevent mechanical collisions between the gripper bridges. Intervenition in the printing process - and thus the excitation of vibrations - is reduced by specifying a relatively large tolerance band outside the range about the angular position for sheet transfer. Intervention - 5 in the control structure is concentrated in the range about the angular position at which sheet transfer takes place.
In order to minimize any angular differences between the individual printing units or printing-unit groups, particularly in the range of sheet transfer. an advantageous embodiment of the drive according to the invention provides that a correction value na:Lz= is added to the rotational-speed setpoint- value said correction value nci:Lzz being dimensioned such that the detec"--ed angular difference between the printing units or printing-unit groups is just compensated by the time sheet transfer takes place. For this purpose, t-he angle feedback control computes the time to sheet transfer from the rotational-speed setpoint value and the angle setpoint value at which sheet- transfer is t_o take place. On the basis of the angle-of-rotation difference between the angle setpoint value and the angular ncsition of the respective printing unit or printing-unit group and on the basis of the remaining time to sheet transfer, the feedback control determines the rotall..4onal-speed difference which, when added to the rotational-speed setpoint value, precisely compensates, by the tir-ne of sheet transfer, for the existing angleof-rotation difference. This calculated rotationalspeed se.11-point value is inputted into the rotationalspeed feedback control as the new setpoint value.
According to an advantageous further development of the process according to the invention, it is further provided 1Chat the angle-of-rotation deviations regularly occurring during each revolution are stored as a function of the respective angular position of the printing unit or printing-unit group and as a function of the rotational speed. In particular, therefore, periodically occurring fluctuations in torque and rotational speed - and, connected with them, the periodically occurring deviations in angle of rotation are used here in order to compute and prepare in advance the necessary changes in rotational speed as a function of the angular position. One of the causes of the periodic fluctuations in torque is, for example, the cyclical movement of the gripper bridges.
The drive according to the invention is explained in greater detail with reference to the following figures, in which:
Fig. 1 shows a schematic representation of a printing press with two printing units, with each printing unit being associated with its own drive motor; Fig. 2 shows a graph representing the dependence of the permissible ro.1Lational-speed deviation on th ---ing unit L--e angular position of the print according to an embodiment of the drive according to the invention; Fig. 3 s'--.ows a flowchart for the control of the drives according to an embodiment of the drive according to the invention; Fig. 4 shows a flowchart for the control of the drives according to a further embodiment of the drive according to the invention and Fig. 5 s.hows a flowchart for the control of the drives according to a further embodiment of the drive according to the invention.
Fig. 1 shows a schematic represent at i on of a printing press (not shown separately) with two printing units 1, 1'. Each of the two printing units 1, 11 is associated with a drive 2, 2'. Disposed on a single-revolution 7 - n angle sensor 3, shaft of the printing units 1, 1, is a. 3', which detects the respective angular position 0 Y 1..r..2. of the printing units 1, 1 1. Said angular position of the two printing units 1, 1' is supplied to a microcomputer 4.Said microCOMMUt-er is further provided from a setpoint-input device 5 with the rotational-speed setpoint value and the angle set-Doint value at which sheet transfer is to take place. On the basis of the angular difference 'Pdtúz:c between "-he preselected angle setpoint value and the angular positions. of the printing units 1, 1', the microcomputer 4 computes the torque setpoint values Said torque values t are dimensioned such that &.he permissible angle-of-rotation deviation of the individual printing units 1, 1' from the preselected t- setpoint value i.e. the ancular position all which sheet transfer takes place, is minimal.
The following Fig. 2 to 5 show specimen- embodiments of the drive according to the invention.
Fig. 2 shows the tolerable anggle-of-rottation and rotational-speed deviation SOc., and n=,=,, respectively, as a function of the respective angular position 'P of the printing units 1, 1'. This graph shows the case in which sheet transfer takes place with the printing press in the zero position (0-, 360-, 720-, _). Ideally, the drive according to the invention operates in such a manner that the setpoint. angular position SO C.E the printing units 1, 11 is reached precisely at the instant of sheet transfer. At least, however, any angular deviation must be kept so small that mackling does not have an adverse effect on the quality of the printed product.
4r 8 - Outside of this angular-position range at which sheet transfer takes place, the requirements in terms of the tolerable angular deviations between the individual printing units 1, 1' are less stringent. It must be noted, nevertheless, that, within a range about the angular position at which sheet transfer takes place, the permissible angle-of-rotation deviation is restricted by the gripper movement of the cylinders.
If, in this case, a preselectable angle-of-rotation tolerance SP.,r,.L is exceeded, there may be gripper collisions and thus damage to the gripper bridges and cylinders. Outside this range, in which the tolerable angular deviation T-=,,, is restricted only by the specific design of the cylinders, the permissible angle of-rotation deviations Y.,-,:,, are greater.
Through the specification of an angle- of-rotation tolerance Y.,.L that is deoendent on t-he resDective angular position of the printing units 1, 1', major control interventions in the drives 2, 21 of the printing units 1, 11 are concentrated around the range of the angular position at sheet transfer.
Outside a narrow range about the angular position at which sheet transfer takes place, interventi.ons are required only to a minor extent, if at all.
Fig. 3 shows a flowchart for the control of the drives 2, 2' according to an embodiment of the drive according to the invention. The algorithm is suitable for the general determination of manipulated variables, i.e. for the determination of the torque M, M' with reference to Fig. 1.
In the following, the det ermination of manipulated variables according to the invention is described al-ways for one printing unit 1, 1'.
The start of a sampling cycle begins at 6. Then, at 7, using the rotational-speed setpoint value and the angle setpoint value at which sheet takes place, the angle difference Y-c.L=z to transfer z sheet transfer is determined. Using the rotational speed setpoint value and the ancle difference SOc:Lz:c, the time tu to sheet transfer is computed at 8.
At point 9 in the flowchart, the manipulated variable M, M' is computed such that the angle difference Y aú:c= is compensated in the time te remaining before sheet transfer. At 10, the manipulated variable M, M' is suitably corrected. Following the correction c-E the manipulated variable M, M', the program starts the next sampling cycle at 6.
Fig. 4 shows a flowchart for the control of the drives 2, 21 according to a further embodiment of the drive according to the invention. This flowc. hart shows an embodiment of the drive according to the invention with secondary -r-ojt--ational-speed feedback control.
- 11. At 12, as The program starts the sampling cycle at in the previously described specimen embodiment, the angle difference SOaúú= between the ancular position lpaL=.=,.xaL3./ of the printing units 1, 1' and the preselected angle setpoint value is determined. Then, at 13, the remaininc time te to sheet transfer is computed from the rotational-speed setpoint value and the calculated angle difference Y Using the computed time te, th.e rotational speed chance naúrr is COMDUted at 14, said rotational speed chance niúrz being dimensioned such that the ancle difference SO,%.Le= is compensated precisely in the time te remaining before sheet transfer. At 15, the comDuted rotational-speed change ne:Lx= is added to the rotational -speed setpoint value The new rotational-speed setpoint value n..., is used as the basis for the rotational-speed feedback control of the drives 2, 2'. Then, at 11, the program starts the next sampling cycle.
A further advantageous embodiment for the control of the drive according to the inventi on is shown in Fig. 5. 1 n this specimen embodiment, use is made of the fact that the torque fluctuations and thus also the angleofrotation deviations at the individual printing units 1, 11 occur as a function of the angular position Y of the printing units 1, 11, if one disregards irregularly occurring, random fluctuations. The regularly occurring fluctuations are repeated cyclically at each revolution of the printing press. It should be noted in this respect that the occurring torque flUCtuations and thus also the angle-of-rotation deviations between the individual printing units 1, 1' depend on the press speed v and thus on the rotational speed n of the printing press.
The program starts at 16. Then - -as in the previously described embodiments - the angle difference,:Lz_e from the preselected angle setpoint value Y is determined. Furthermore, as described likewise in the preceding examples, at 18, the time tt, to sheet transfer is computed from the rotational-speed setpoint value and the angle-of -rotation difference Y -c:m:L:e:e to sheet transfer. The angle-of-rotation difference IP a.Lez of the printing unit 1 from the -preselected angle setpoint value is stored at-19 as a function of the current angle-of-rotation position of the printing unit 1. The previously stored angle difference ( kP + A%0) is read at 20. Then, in part 21 of the program, a manipulated variable M is computed which compensates for the angular deviation Ps:L== in the time tu remaining before sheet transfer, with use being made of the knowledge of SOeLú== ( Y +ASO) from an earlier measurement. In this case, therefore, an additional manipulated variable is computed from 1Che known angle difference Tm:L== (tp) from a previous revolution of printing press, said additional manipulated variable taking account of the likely angular deviation. In order to compute the additional manipulated variable, the angle difference Y:iiz:E is stored with the informaticn on the angular position (P during a revolutio--- of- the printing Dress. A kind of rotational speed trend is then computed for each stored value. This computation of the additional manipulated variable takes place, therefore, concurrently with the execution of the control algorithm.
It will be appreciated that the invention has been described above by way of example only and that changes may be made without departing-from the scope of the invention.
1

Claims (8)

WHAT IS CLAIMED IS:
1. Drive for a printing press with a plurality of printing units, with the individual printing units or printing-unit groups being mechanically decoupled from one another, with each printing unit or print-ing-unit group being associated with a drive motor and with each printing unit or printing-unit group being provided with a device for rotational speed and/or angle-of-rotation determination, characterized in that a dev-:.ce for angle feedback control is provided, said device dimensioning the permissible angle-o'_ rotation deviation of the indiv-idual printing units (1) or printing-unit groups from a preselected angle setpoint value such that said deviation is minimal at least in the angle-of rotation position in which sheet transfer takes place.
2.
Drive according to claim 1, characterized in that the permissible angle-of -rotation deviation of the individual printing units (1) or printing-unit groups from a preselected angle setpoint value exhibits a preselectable dependence on the angular position of the printing unit (1) or printi-ng-unit group.
Drive according to claim 1 or 2, characterized in that the permissible angular deviation Yc., within a preselectable range about the angle-ofrotation position in which sheet transfer takes place is 13 - smaller than at angle-of-rotation Positions outside said range.
Drive according to claim 1, 2 or 3, characterized in that the angle feedback control preselects an angle setpoint value and the respective angle of-rotation deviation of the individual printing units (1) or printing-unit groups is determined with respect to said preselected angle setpoint value mom'ri;>C):Lzl,'e.
5. Drive according to claim 1, 2 or 3, characterized in that the angle feedback control preselects an angle setpoint value for a first printing unit (1) or first printing-unit group and determines the angle-of-rotation deviation of eac.-. of the following units (1) or printing-unit groups with respect to the angle-of-rotation position of the preced:.ng printing unit (1) or preceding printing unit group.
6. Drive according to claim 1, 2 or 3, cha racteri zed in that the device for angle feedback.control determines the tational-speed time tu to sheet transfer from the rot setpoint- value and the angle setpoint value in that the device for angle feedback control continues to COMPUte the rotational-speed difference naLz:c by which the rotational speed must be increased or reduced in order to minimize the angle-of-rotation deviation in the remaining time to sheet transfer, and in that the device for angle feedback control controls the corresponding drive motor according to - 14 the calculated new rotational-speed setpoint value n = + ne-ú:zz.
7. Drive according to claim 6, c h a r a c t e r i z e d i n t h a t the device for angle feedback control is associated with a storage apparatus in which the calculated rotational-speed setpoint values are stored as a function of the angle-of-rotation position of the printing units (1) or printing-unit groups and as a function of the respective rotational speed n of the printing press.
8. Drive for a printing press with a plurality of printing units, substantially as hereinbefore described with reference to the accompanying drawings.
31
GB9221398A 1991-11-19 1992-10-12 Drive for a printing press with a plurality of printing units Expired - Fee Related GB2261629B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19914137979 DE4137979B4 (en) 1991-11-19 1991-11-19 Drive for a printing press with at least two mechanically decoupled printing units

Publications (3)

Publication Number Publication Date
GB9221398D0 GB9221398D0 (en) 1992-11-25
GB2261629A true GB2261629A (en) 1993-05-26
GB2261629B GB2261629B (en) 1994-11-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9221398A Expired - Fee Related GB2261629B (en) 1991-11-19 1992-10-12 Drive for a printing press with a plurality of printing units

Country Status (4)

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JP (1) JP3272421B2 (en)
DE (1) DE4137979B4 (en)
FR (1) FR2683767B1 (en)
GB (1) GB2261629B (en)

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EP0644048A3 (en) * 1993-12-29 1995-06-28 Wifag Maschf Rotary printing machine with blanket- and plate cylinders arranged in cylinder units in couples.
EP0699524A3 (en) * 1994-08-30 1997-02-05 Roland Man Druckmasch Offset printing machine
WO1997011848A1 (en) * 1995-09-28 1997-04-03 Siemens Aktiengesellschaft Rotary printing press without shafting
EP0878302A1 (en) * 1997-05-17 1998-11-18 MAN Roland Druckmaschinen AG Displaceable cylinder driven by an individual electrical drive
EP0904934A1 (en) * 1997-09-26 1999-03-31 Heidelberger Druckmaschinen Aktiengesellschaft Device and method for driving printing machines with a plurality of independent driving motors
EP1110722A1 (en) * 1994-08-30 2001-06-27 MAN Roland Druckmaschinen AG Offset printing machine
EP1116582A1 (en) * 2000-01-13 2001-07-18 Fischer & Krecke Gmbh & Co. Method and device for driving a printing cylinder
US6446553B1 (en) 1996-10-12 2002-09-10 John Ian Costin Printing apparatus
US6644184B1 (en) 1995-02-09 2003-11-11 Man Roland Druckmaschinen Ag Offset printing machine
DE4344896C5 (en) * 1993-12-29 2004-07-29 Maschinenfabrik Wifag Drive for cylinder of a web-fed rotary printing machine
CN100358715C (en) * 2002-04-17 2008-01-02 海德堡印刷机械股份公司 Compensation of cylinder vibration for printing material processing machine

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DE19525169C2 (en) * 1995-03-18 2000-02-03 Koenig & Bauer Ag Method for driving a folder
DE19520642C1 (en) * 1995-06-09 1996-12-05 Roland Man Druckmasch Method for controlling a multi-motor drive of a printing press and corresponding control
DE19525593C2 (en) * 1995-07-13 1997-04-30 Roland Man Druckmasch Multi-motor drive for a printing press
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CN1061301C (en) * 1993-12-29 2001-01-31 Wif机械制造公司 Rotative press in wich cylinder groups are formed by pairs of rubber fabric cylinder and plate cylinder
EP0644048A3 (en) * 1993-12-29 1995-06-28 Wifag Maschf Rotary printing machine with blanket- and plate cylinders arranged in cylinder units in couples.
DE4344896C5 (en) * 1993-12-29 2004-07-29 Maschinenfabrik Wifag Drive for cylinder of a web-fed rotary printing machine
US7146908B2 (en) 1994-08-30 2006-12-12 Man Roland Druckmaschinen Ag Offset printing machine
US7000539B2 (en) 1994-08-30 2006-02-21 Man Roland Druckmaschinen Ag Offset printing machine
EP1493564A1 (en) * 1994-08-30 2005-01-05 MAN Roland Druckmaschinen AG Offset printing machine
US6779446B2 (en) 1994-08-30 2004-08-24 Man Roland Druckmaschinen Ag Offset printing machine
EP1277575A1 (en) * 1994-08-30 2003-01-22 MAN Roland Druckmaschinen AG Offset printing machine
EP1110722A1 (en) * 1994-08-30 2001-06-27 MAN Roland Druckmaschinen AG Offset printing machine
US7159513B2 (en) 1994-08-30 2007-01-09 Man Roland Druckmaschinen Ag Offset printing machine
EP1132202A1 (en) * 1994-08-30 2001-09-12 MAN Roland Druckmaschinen AG Offset printing machine
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Also Published As

Publication number Publication date
GB2261629B (en) 1994-11-02
JP3272421B2 (en) 2002-04-08
FR2683767A1 (en) 1993-05-21
FR2683767B1 (en) 1997-03-28
DE4137979B4 (en) 2004-05-06
JPH05229103A (en) 1993-09-07
DE4137979A1 (en) 1993-05-27
GB9221398D0 (en) 1992-11-25

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