EP1778490B2 - Method for controlling a machine for processing sheet material - Google Patents

Description

The invention relates to a method for controlling a processing machine for sheet material with at least one printing or coating unit according to the preamble of the independent claims 1 and 2.

A processing machine of this kind is according to EP 0 812 683 A1 with a controllable direct drive for a single driven cylinder known. From at least for the transport of the sheet material provided gear train a sheetfed offset printing decoupled a plate cylinder or a blanket cylinder is at least one printing unit by means of individual drive in a predeterminable manner directly driven. By individually and independently of other cylinders directly driven plate cylinder in addition to printing correction possibilities also other processes, such as plate replacement or cleaning of cylinders, realized.

Out US-A 5,983,793 (see also EP 0 834 398 A1 ) is a drivable sheet-fed printing machine, in which the cylinders and drums (for the sheet transport and the respective blanket cylinder) and the plate / forme cylinder via a gear train with controllable main drive can be driven. The plate / form cylinders are each associated with clutches and a single controllable drive. The drives are only available as auxiliary drives with open clutches and do not drive the plate cylinder in the printing operation. The rollers of the inking and / or dampening units can be driven by the plate / forming cylinders each having its own drive.

In a control programs for driving the plate / forme cylinder with dissolved clutches and the related color / dampening units are stored for pre-inking or pre-moistening. Furthermore, in the control programs for driving the remaining cylinders and drums on the main drive with disengaged clutches for washing at least one of the cylinders and drums are stored.

According to DE 42 23 583 A1 is a printing machine and a method for driving this when changing the plate known. The printing press comprises a plurality of plate cylinders drivable by a continuous gear train from a main drive. The plate cylinders are uncoupled and coupled by the continuous gear train for rotational displacement from a pressure-positional angular assignment in the plate change position and from this back.

In the document DE 101 29 555 A1 is a method for duplication-reducing control of a printing press described. Before printing a first of the sheets in a printing unit, all printing units are switched to print-on position.

Out US-A 5,964,157 a method and a printing machine are known, according to which at least a part of a printing unit of the printing press is associated with a washing device and the printing press comprises a controller. During the machine run, the ink consumption occurring in the printing unit is determined according to at least one characteristic of the ink metering, and the frequency and / or the nature of the washing process are determined from this particular ink consumption.

According to US 2004/0074409 A1 is a painting device for a rotary printing press with a printing cylinder, a blanket cylinder and a plate cylinder with at least one inking known. On the plate cylinder plate clamping devices are peripherally arranged to fix a bendable laminate. The laminated body comprises a carrier layer and at least one blanket cover layer arranged on the carrier layer, wherein only the carrier layer is fixed by means of the plate clamping devices.

The invention is based on the object to provide methods of the type mentioned with a cleaning device, with a significant set-up time reduction by superposition of setup operations in connection with a plate change is to be achieved.

This problem is solved by the training features of claims 1 and 2.

Further developments emerge from the dependent claims.

An advantage of the method for controlling a processing machine with at least one directly driven cylinder is that a significant set-up time reduction is realized by the controlled, simultaneous combination of previously individual or sequential operations on a processing machine.

One advantage is based on the fact that preferably before the change of the printing plates on the plate cylinder, the inking rollers and the respective printing forme are cleaned by means of a known inking unit washing device. As a result, a cleaned printing plate is always removed from the plate cylinder by means of the printing plate changing device, a new printing plate can be fed back to the plate cylinder and the possible contamination of the printing plate changing device or contacted parts by a not or insufficiently cleaned printing plate is avoided.

Alternatively, it is possible that a first, still colored (printed) printing form is replaced by the printing form changing device against a second printing plate on the plate cylinder. However, this is - as already mentioned - to expect dirt on the printing plate changing device.

Furthermore, it is possible to remove from a colored printing form, the ink or noticeably reduced by the printing plate on the plate cylinder with the blanket on the blanket cylinder in contact and are printed by blanket cylinder or blanket a predetermined number of sheets, previously the Ink supply to the printing form is interrupted. A printing form with removed or noticeably reduced printing ink can then be exchanged for a second printing form by means of a printing form changing device, or the printing plate is additionally cleaned by means of the inking unit washing device (in the case of employed inking rollers).

An advantage is to be noted that according to the invention before the change of the printing plates on the forme cylinder, the respective printing forme by means of a cleaning device, according to the invention with canceled pressure contact between the forme cylinder and the sheet guiding cylinder cleaned. As a result, a cleaned printing forme is always removed from the forme cylinder by means of the printing plate changing device, a new printing forme can again be supplied to the forme cylinder, and possible fouling of the printing plate changing device or contacted parts by a not or insufficiently cleaned printing forme is avoided.

Alternatively, it is possible for a first, printed printing form to be replaced by the printing form changing device against a second printing form on the forme cylinder. Here, however, as already mentioned, dirt can be expected.

If required, the metering system associated with the forme cylinder, for example a chambered doctor blade with a screened application roller, can be cleaned simultaneously with the printing form change.

Fig. 1

eine Bogenrotationsdruckmaschine mit mehreren Druckwerken und einem Lackwerk.

The invention will be explained in more detail using an exemplary embodiment. It shows schematically:

Fig. 1

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

The sheet-fed rotary printing press is exemplified 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, 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 supply device 11 for the medium to be processed (lacquer, paint), for example a chambered doctor blade with assigned, screened application roller, and a forme cylinder 9. Plate cylinder 10 and forme cylinder 9 each carry at least one printing plate.

For the sheet transport in the conveying direction 3 more sheet guiding cylinder 6 are provided. In each printing or coating unit 1.2 is formed 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 printing unit 1 formed as a printing cylinder sheet guiding cylinder 6 a plant drum is arranged as a sheet guiding cylinder 6. For the sheet transport between the printing cylinders as designed sheet guiding cylinders 6 of the printing or coating units 1, 2 more sheet guiding cylinder 6 are arranged as a transfer cylinder.

Each blanket cylinder 8, preferably each form cylinder 9 and each preferably designed as a printing cylinder sheet guiding cylinder 6 is associated with a cleaning device 7. Each inking unit 12 has a Farbwerkschwascheinrichtung, for example, directed to the compactor detergent spraying system and a engageable doctor device on a in the direction of rotation of the plate cylinder 10 last inking roller, on.

At least all of the sheet guiding cylinders 6 are coupled together via a not-shown main drive gear train. Each plate cylinder 10, and preferably each forme cylinder 9, is driven by a direct drive, i. a separate drive motor, driven. These direct drives take place in a predeterminable manner at least with respect to the sheet guiding cylinders 6.

Each blanket cylinder 8 is driven by means of the main drive via a gear train of the sheet guiding cylinder 6.

The process for controlling the processing machine takes place in each offset printing unit 1 or coating unit 2 as follows.

In a contact zone of the printing plate bearing, designed as a plate cylinder of an offset printing unit 1 directly driven cylinder 10 to a neighboring blanket cylinder 8 a pressure contact is released. Subsequently, the plate cylinder 10 is rotated from its current angle assignment in an angular position for removing a first located on the plate cylinder 10 printing form by direct drive. Subsequently, the first printing form is removed from the directly driven plate cylinder 10 and fed a second printing plate to the plate cylinder 10 and fixed thereon. Subsequently, the plate cylinder 10 is rotated with the second printing form in an angular assignment for the printing process by direct drive. Simultaneously with the above-described changing of the printing plates on the plate cylinder 10 and with canceled pressure contact between plate and blanket cylinder 10; 8, a cleaning device 7 is set to the blanket cylinder 8, the blanket is cleaned and then the cleaning device 7 is turned off by the blanket cylinder 8. Then be the blanket cylinder 8 and the now the second printing plate bearing plate cylinder 10 in the contact zone brought into renewed pressure contact.

During the printing plate change on the plate cylinder 10 and the cleaning of the blanket on the blanket cylinder 8 a cleaning device 7 is simultaneously employed on a driven by the main drive and gear train sheet guiding cylinder 6, cleaned the cylinder surface and then turned off the cleaning device 7 again.

The cleaning device 7 is in particular to a as a printing cylinder (offset printing unit 1) formed sheet guiding cylinder 6 on / off, so that each offset printing unit 1 during the printing form change on the plate cylinder 10, the blanket on the blanket cylinder 8 and the blanket cylinder 8 adjacent sheet guiding cylinder 6 are cleaned simultaneously , If necessary, formed as a printing cylinder sheet guiding cylinder 6 is also cleaned independently of the blanket cylinder 8.

According to the invention, the pressure contact between the plate cylinder 10 and blanket cylinder 8 is canceled before the change of a printing plate on the plate cylinder 10 and the inking rollers and the printing plate on the direct drive plate cylinder 10 are cleaned by means of a Farbwerkschwascheinrichtung. As a result, a cleaned printing plate is always available on the directly drivable plate cylinder 10 for the subsequent printing plate change.

In a contact zone of the printing plate-bearing, designed as a forme cylinder of a coating unit 2 directly driven cylinder 9 is lifted to an adjacent sheet guiding cylinder 6, a pressure contact. The forme cylinder 9 is rotated from its current angle assignment in an angular position for removing a first printing form located on the forme cylinder 9 by means of direct drive, the first printing form is removed from the forme cylinder 9 and a second printing forme is fed to the forme cylinder 9 and fixed thereon. Subsequently, the forme cylinder 9 is rotated with the second printing forme in an angular assignment for the printing process (painting) by means of direct drive.

Simultaneously with the change of the printing plates on the direct drive cylinder 9 and canceled pressure contact between the form cylinder 9 and the pressure cylinder formed as a sheet guiding cylinder 6, a cleaning device 7 is employed on these driven by the main drive and gear train sheet guiding cylinder 6, cleaned the cylinder surface and then turned off the cleaning device 7. Subsequently, the sheet guiding cylinder 6 and the meantime the second printing plate-carrying forme cylinder 9 are brought in the contact zone in renewed pressure contact.

According to the invention, before the change of a printing forme on the direct-drive forme cylinder 9, the pressure contact between the forme cylinder 9 and the sheet guiding cylinder 6 designed as a printing cylinder is canceled and the printing forme on the forme cylinder 9 is cleaned by means of a cleaning device 7 which can be turned on / off. Preferably, the forme cylinder 9 adjacent, for example, screened, applicator roll on / off adjustable trained and cleaning to form cylinder 9 out of contact.

LIST OF REFERENCE NUMBERS

1

Offset printing

2

coating unit

3

conveying direction

4

investor

5

boom

6

Sheet guiding cylinder

7

cleaning device

8th

Blanket cylinder

9

Form cylinder (directly driven cylinder)

10

Plate cylinder (direct drive cylinder)

11

supply

12

inking

Claims (3)

1. Method to control a processing machine for sheet material with at least one offset printing mechanism (1), whereby a plate cylinder (10) situated in a side frame carrying a printing plate is coupled with a direct drive and is mechanically decoupled from a main drive acting on the drive train of a cylinder designed as sheet-guide cylinders (6) and cylinders for sheet transport in such a way that the plate cylinder (10) is driven in printing mode by means of the direct drive, whereby the plate cylinder (10) can be selectively driven at least towards the sheet-guide cylinders (6) and whereby a blanket cylinder (8) is situated adjacent to the plate cylinder (10) and directly adjacent to the sheet-guide cylinder (6) of the printing mechanism (1) located directly adjacent, which a cleaning apparatus (7) is assigned to, characterized in that a printing contact to the blanket cylinder (8) is eliminated in a contact zone of the directly driven plate cylinder (10) carrying the printing plate so that the plate cylinder (10) is rotated out its current angle assignment into an angular position to remove a first printing plate located on the plate cylinder (10) by means of a direct drive, the first printing plate is removed from the plate cylinder (10) and a section printing plate is supplied to the plate cylinder (10) and fixed upon it and then, the plate cylinder (10) with the second printing plate is rotated into an angle assignment for the printing cycle by means of a direct drive and that, at the same time the change of the printing plates takes place on the plate cylinder (10) and when the printing contact between the plate and blanket cylinders (10; 8) is eliminated, a cleaning apparatus (7) is placed onto the blanket cylinder (8) so that the blanket cylinder (8) is driven by means of a main drive via a gear train of the sheet-guide cylinder (6), the rubber blanket is cleaned and afterwards, the cleaning apparatus (7) is turned off and then the blanket cylinder (8) as well as the plate cylinder (10), which, in the meantime, is now carrying the second printing plate are brought into printing contact again at the contact zone and that, before changing a printing plate on the plate cylinder (10), the printing contact between the plate cylinder (10) and the blanket cylinder (8) is eliminated and the inking-system rollers and the printing plate on the directly driven plate cylinder (10) are cleaned by means of a inking-system washing device.
2. Method to control a processing machine for sheet material with at least one coating unit (2), whereby a form cylinder (9) situated in a side frame carrying a printing plate is coupled with a direct drive and is mechanically decoupled from a main drive acting on the drive train of a cylinder designed as sheet-guide cylinder (6) and cylinders for sheet transport in such a way that the form cylinder (9) is driven in printing mode by means of the direct drive, whereby the form cylinder (9) can be selectively driven at least towards the sheet-guide cylinders (6) and whereby, directly adjacent to the form cylinder (10) and to the sheet-guide cylinder (6) of the coating unit (1) located directly adjacent, a cleaning apparatus (7) is assigned, characterized in that a printing contact to the directly adjacent sheet-guide cylinder (6) is eliminated in a contact zone of the directly driven form cylinder (9) of the coating unit (2) carrying the printing plate so that the form cylinder (9) is rotated out its current angle assignment into an angular position to eliminate a first printing plate located on the form cylinder (9) by means of a direct drive, the first printing plate is removed from the form cylinder (9) and a section printing plate is supplied to the form cylinder (9) and fixed upon it and then, the form cylinder (9) with the second printing plate is rotated into an angle assignment for the printing cycle by means of a direct drive and that, at the same time the change of the printing plates takes place on the form cylinder (9) and when the printing contact between the form cylinder (9) and the sheet-guide cylinder (6) is eliminated, a cleaning apparatus (7) is placed onto this by means of a main drive and sheet-guide cylinders (6) that can be driven via a gear train, the cylinder barrel of which is cleaned and afterwards, the cleaning apparatus (7) is turned off and then the sheet-guide cylinder (6) as well as the form cylinder (9), which is, in the meantime, holding the second printing plate, are brought into contact again at the contact zone.
3. Method according to Claim 2, characterized in that, before changing a printing plate on the form cylinder (9), the printing contact between the form cylinder (9) and the sheet-guiding cylinder (6) located directly adjacent is eliminated and the printing plate on the form cylinder (9) is cleaned by means of a cleaning apparatus (7).

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