EP1961560B1 - Method for operating a processing machine - Google Patents

Abstract

The processing machine has a printing unit (12) or a varnishing unit (2). A plate cylinder (10) of the printing unit or a form cylinder (9) of the varnishing unit is drivable in the gear train in an integrated way by the main drive and gear train. A control unit is indirectly present in a security control incident of a synchronous processing.

Description

The invention relates to a method for operating a processing machine, in particular a sheet material-processing printing machine or varnishing machine, according to the preamble of claim 1.

Sheet-fed printing machines and painting machines have a variety of facilities that need to be driven in the printing / painting, setting or maintenance operation of the respective machine. In classical constellations all driven devices of such a printing or coating machine are driven by a so-called main drive. All driven devices are then usually mechanically connected via a transmission technology coupling, in particular a closed gear train, with the main drive.

In modern concepts for sheet material processing printing presses at least some of the driven devices of a printing press are driven by an engine. Thus, it is already known from the prior art to drive form cylinders or plate cylinders of printing units of the printing press by virtue of the fact that each of the form cylinder is assigned a separate drive, so that the form cylinder can be driven independently of the main drive.

A sheet material processing printing machine whose printing works have self-propelled forme cylinder (plate cylinder), is from the EP 0 834 398 B1 known, according to this prior art driven by the main drive rubber cylinder of the printing units and the respective self-powered Form cylinder (plate cylinder) of each printing unit via a switchable coupling can be coupled or decoupled.

In order to ensure safe operation of a printing machine, protective measures must be implemented on the control side for all hazards caused by drives of the printing press. This applies both to the main drive as well as each independently driven by the main drive drive a self-propelled device. Thus, a safe operation of a drive is usually only to be ensured if basic protective measures or safety specifications are implemented for it, in particular measures for a safe shutdown of the drive, measures against an unexpected start of the drive, measures to maintain maximum speeds of the drive, measures to comply with maximum distances of the drive and measures to maintain a correct direction of rotation of the same. The implementation of all these protective measures for the main drive and each independently driven from the main drive drive the self-propelled devices of the printing press requires a lot of effort on the control side. This is disadvantageous overall.

The object of the invention is to provide a method for operating the processing machine of the type mentioned above with at least one individually driven, a printing plate-bearing cylinder, which improves the reliability.

The object is solved by the training features of claim 1. Further developments emerge from the dependent claims.

The processing machine according to the invention has a control device which, when a safety-relevant event is present, predetermines a plate cylinder or forme cylinder driven by a braking force on the individual motor driven by a single drive.

In this case, the plate cylinder of the respective printing unit or the forme cylinder of the respective coating unit is braked under adhesion by means of one frame-fixed braking device and the single drive of the plate cylinder or the forme cylinder is switched torqueless.

The term "single drive of the forme cylinder in the coating unit" also includes an own motor driven (single drive) drive of a forme cylinder in a flexographic printing unit. Likewise, the term "printing form" includes a paint form or a flexographic printing form. The term of operational safety includes the emergency operation of a single-motor driven plate cylinder / forme cylinder in case of failure of the individual drive and the reliability supporting diagnostic options.

With this mode of operation an uncontrolled turning (tumbling) of a cylinder can be prevented after failure of the drive torque of the individual drive assigned to the cylinder.

Fig. 1:

eine Bogenrotationsdruckmaschine mit mehreren Druckwerken und einem Lackwerk,

Fig. 2:

eine erste Antriebseinrichtung für einen Plattenzylinder in einem Offsetdruckwerk,

Fig. 3

eine zweite Antriebseinrichtung für einen Formzylinder in einem Lackwerk, alternativ in einem Flexodruckwerk.

The invention will be explained in more detail below using an exemplary embodiment. Showing:

Fig. 1:

a sheet-fed rotary printing machine with several printing units and a coating unit,

Fig. 2:

a first drive device for a plate cylinder in an offset printing unit,

Fig. 3

a second drive means for a forme cylinder in a coating unit, alternatively in a flexographic printing unit.

The sheet-fed rotary printing machine is shown for example with a feeder 4, five offset printing units 1, a coating unit 2 and a boom 5. Each offset printing unit 1 has, in a known manner, an inking unit 12 with inking unit rollers, a cylinder 10 carrying a printing plate, here as a plate cylinder 10, and a blanket cylinder 8. If necessary, each plate cylinder 10 is associated with a dampening unit.

The coating unit 2 has in a known manner a metering device 11 for the medium to be processed (paint, ink), preferably a chambered doctor blade with assigned, screened applicator roll, as well as a printing plate (paint form, flexographic printing) carrying cylinder 9, here as a forme cylinder 9, on.

Plate cylinder 10 and forme cylinder 9 each carry at least one printing plate and are in contact with the inking rollers of the inking unit 12 or the applicator roller of the metering device 11. For the sheet transport in the conveying direction 3 more sheet guiding cylinder 6 are provided. In each offset printing or coating unit 1, 2 is designed as a printing cylinder sheet guiding cylinder 6 with the respective blanket cylinder 8 and form cylinder 9 in functional connection, wherein in the first offset printing unit 1 formed as a printing cylinder sheet guiding cylinder 6 a collision drum is arranged as a sheet guiding cylinder 6. For the sheet transport between the printing cylinder 2 designed as a pressure cylinder sheet of the printing or coating units 1, 2 more sheet guiding cylinder 6 are arranged as a transfer cylinder. The sheet-guiding cylinders 6 designed as pressure cylinders and the blanket cylinders 8 and the forme cylinder 9 are preferably associated with washing devices 7.

At least all of the sheet guiding cylinders 6 are coupled to each other via an unspecified main drive (at least one feeding drive motor) and a closed gear train on the drive side. In this gear train also the blanket cylinder 8 of the offset printing units 1, each with a blanket cylinder gear 13 are integrated. In the coating units 2 of the forme cylinder 9 adjacent sheet guiding cylinder 6, each with a sheet guiding cylinder gear 17 is integrated into this gear train.

Each plate cylinder 10 and preferably each form cylinder 9 is - mechanically decoupled from the main drive and gear train - each by a single drive M (also called direct drive), ie a separate drive motor, driven. These individual drives M are coupled with a machine control and are in vorgebbärer Way with respect to the main drive and gear train with the sheet guiding cylinders 6 in the coating units 2 and additionally coupled with the main drive and gear train blanket cylinders 8 in the offset printing units 1 individually driven. When form cylinder 9.und plate cylinder 10 is therefore a self-propelled by means of individual drive M device of the sheet-fed rotary printing press.

It should be noted at this point that the sheet-fed rotary printing press may comprise a plurality of main drives which feed into the closed gear train. In the offset printing 1 each with the adjacent sheet guiding cylinder 6 drive side coupled blanket cylinder 8 is driven by the main drive with gear train and in the offset printing units 1, preferably each plate cylinder 10 is driven by motor M by means of individual drive. The forme cylinder 9 in the coating unit 2 adjacent sheet guiding cylinder 6 is driven by the main drive with gear train and preferably each of the forme cylinder 9 of the coating units 2 is driven by an individual motor M self-propelled. Alternatively, a sheet-fed rotary printing machine having a plurality of offset printing units 1 or coating units 2 can also have individual offset printing units 1 and / or coating units 2 whose plate or forme cylinders 10, 9 have no individual drive M. Such conventional plants 1, 2 are driven in total by means of the main drive and gear train within the processing machine. The corresponding plate or forme cylinder 10, 9 are thus integrated into the gear train.

In printing units 1, the clutch 15 is disposed between the driven by the main drive and gear train cylinders and the respective by means of individual drive motor driven plate cylinder 10.
As in Fig. 2 is shown, a force-locking clutch 15 is disposed between the blanket cylinder 8 and the plate cylinder 10 of an offset printing unit 1. Alternatively, the clutch 15 can also be arranged between a sheet guiding cylinder 6 and the plate cylinder 10.

In the present example, the clutch 15 is disposed on the plate cylinder 10 and the plate cylinder 10, a freely rotatable gear 14 of the clutch 15 is further arranged adjacent. The freely rotatable gear 14 is in constant mesh with the blanket cylinder gear 13 of the gear train driven by the main drive. Of the main drive and gear train is thus fed to the blanket cylinder gear 13 a drive 16 (from the main drive with gear train).
In a further embodiment, the freely rotatable gear 14 may be coupled by means of a transmission connection directly or by means of another coupling with the downstream inking unit 12 on the drive side.

In normal pressure operation, in which the plate cylinder 10 is driven by an individual motor M, the clutch 15 is opened, so as to decouple the plate cylinder 10, especially the gear 14, from the main drive or from the blanket cylinder gear 13.

To implement the necessary safety measures for the self-propelled plate cylinder 10 is proposed in the sense of the present invention, the safety measures of the main drive (with gear train) on the control side on the self-powered plate cylinder 10 of the respective offset printing unit 1 in that it is monitored whether a security relevant Event exists, wherein immediately in the presence of a safety-relevant event, a control device 18 prescribes a braking force to the respective own motor driven by single drive M plate cylinder 10 or forme cylinder 9. That ever a frame-fixed braking device brakes the plate cylinder 10 of the respective printing unit 1 or the forme cylinder 9 of the respective coating unit 2 under adhesion and the single drive M of the plate cylinder 10 or the forme cylinder 9 is switched torqueless.

For this purpose, in the context of the present invention, the control device 18, which is supplied with a signal as an input signal, which contains data on whether a security-relevant event is present or not. The control device 18 or more control devices 18 are preferably coupled to a control station.

In Fig. 3 It is shown that between the form cylinder 9 and the adjacent sheet guiding cylinder 6 (printing cylinder) of a coating unit 2, a force-acting clutch 15 is arranged.
In the present example, the clutch 15 is arranged on the forme cylinder 9 and on the forme cylinder 9, a freely rotatable gear 14 of the clutch 15 is also arranged adjacent. The freely rotatable gear 14 is in constant mesh with the sheet guiding cylinder gear 17 of the gear train driven by the main drive. From main drive and gear train is a drive 16 (from the main drive with gear train) fed to the sheet guiding cylinder gear 17. In a further embodiment, the freely rotatable gear 14 may be coupled to the downstream applicator roller of the metering device 11 by means of a transmission connection directly or by means of a further coupling on the drive side.
In solid color operation or normal pressure operation, in which the forme cylinder 9 is driven by the individual drive M, the clutch 15 is opened so as to decouple the forme cylinder 9 from the main drive or from the sheet guiding gear 17.

For this purpose, within the meaning of the present invention, at least one control device 18 is used, to which a signal is fed as input signal which contains data on whether or not there is a safety-relevant event. Each with a single drive M coupled plate cylinder 10 and forme cylinder 9 is preferably circuit technology coupled with its own control device 18. The control device 18 is preferably coupled to a control station.

In order to prevent a relative movement of the cylinder, in particular in the contact point (print zone, painting) of the blanket cylinder 8 or the forme cylinder 9 with the associated sheet guiding cylinder 6 (impression cylinder), in a further embodiment of the blanket cylinder 8 or the forme cylinder 9, preferably predetermined by the control device 18, in pressure from - moved position.

As a security-relevant event, it is preferably monitored whether a protective device is open on the sheet-fed printing press and thus a danger zone is accessible to it. However, any other signal can be evaluated as a security-relevant event. Thus, in particular in case of failure of an auxiliary power source or a single drive M, a synchronous operation, as described above, be enforced. An uncontrolled moving (tumbling) of a cylinder after failure of the drive torque of the single drive M on this cylinder is thus also prevented.

A further process configuration allows, for example for diagnostic purposes, the optional drive of the plate cylinder 10 or forme cylinder 9 via the main drive with gear train or the single drive M. Thus, the causes of changes in printing or Lackierqualität in the production process in the field of single drive M or the main drive with gear train, alternatively the other machine peripherals - after analysis assigned and changed or turned off.
In the case of several offset printing units 1, each work 1 preferably has a plate cylinder 10 which can be driven by its own motor, to which a single drive M is assigned. In the case of several coating units 2, each work 2 preferably has a form cylinder 9 which can be driven by an own motor, to which a single drive M is assigned. It is within the meaning of the present invention that for each self-propelled plate cylinder 10 or forme cylinder 9 for each offset printing unit 1 and coating unit 2 separately or individually the presence of at least one security-relevant event is monitored.

The method for operating a processing machine, in particular sheet material processing printing or varnishing machine, with at least one printing / coating unit 1, 2, wherein each printing / coating unit 1, 2 each one a printing plate supporting, coupled with a single drive M plate cylinder 10 and forme cylinder 9, the plate / forme cylinder 10, 9 of a on a gear train of cylinders and drums (sheet guiding cylinder 6) for the sheet transport and printing units 1 acting on the blanket cylinder 8 main drive mechanically decoupled and in a predeterminable manner with respect to the sheet guiding cylinders 6 and blanket cylinders 8 are driven, is
characterized,
that is monitored whether a safety-relevant event is present, wherein immediately in the presence of a safety-relevant event, a control device 18, a braking force to the respective own motor driven by single drive M plate cylinder 10 or forme cylinder 9 dictates that each frame-mounted braking device the plate cylinder 10 of each printing unit. 1 or the form cylinder 9 of the respective coating unit 2 brakes under adhesion and the single drive M of the plate cylinder 10 or the forme cylinder 9 is switched torqueless. The torque of the preferred mechanical braking device is so large that the plate cylinder 10 can be fixed in its braking position.

LIST OF REFERENCE NUMBERS

1

Offset printing

2

coating unit

3

conveying direction

4

investor

5

boom

6

Sheet guiding cylinder

7

washer

8th

Blanket cylinder

9

Printing form bearing cylinder / forme cylinder

10

Printing plate bearing cylinder / plate cylinder

11

metering

12

inking

13

Blanket cylinder gear

14

freely rotatable gear

15

clutch

16

input drive

17

Sheet guiding cylinder gear

18

control device

M

individual drive

Claims (2)

1. A method for operating a processing machine, more preferably a printing or coating machine processing sheet material with at least one printing/coating system, wherein each printing/coating system comprises a plate cylinder or form cylinder coupled with an individual drive each carrying a printing form, the plate/form cylinders can be mechanically decoupled from a main drive acting on a wheel train of the cylinders and drums (sheet guiding cylinder) for the sheet transport and in the case of printing systems acting on the rubber blanket cylinders and, in a manner that can be predetermined, can be driven with respect to the sheet guiding cylinders and rubber blanket cylinders,
   characterized in that
   it is monitored if a safety-relevant event is present, wherein immediately in the presence of a safety-relevant event a control device predetermines a braking force to the plate cylinder or form cylinder in each case driven by its own motor by means of individual drive in such a manner that a frame-fixed braking device each brakes the plate cylinder of the respective printing system or the form cylinder of the respective coating system by way of friction and the individual drive of the plate cylinder or the form cylinder is switched momentless.
2. The method according to Claim 1,
   characterized in that
   the rotational moment of the braking device is so great that the cylinder is fixed in its braking position.

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