DE102008000712A1 - Drying device operating method for sheet printing machine, involves supplying thermal air such that each thermal air supply is intermitted in direction of drying module within seconds by mobile sliding device during occurrence of stopper - Google Patents

Abstract

The method involves directing thermal air over drying modules (13, 14) i.e. infra red radiator, for drying a printed sheet during printing. The thermal air is supplied such that each thermal air supply is intermitted in a direction of the drying module (14) within seconds by a mobile sliding device during occurrence of the stopper. The thermal air quantity not supplied to the module (14) is supplied to the module (13) and/or is dissipated into surroundings over a bypass. The supply of the thermal air is unblocked in the direction of the drying module (14) after removing the stopper.

Description

The The invention relates to a method for operating a drying device A printing press according to the preamble of claim 1.

Sheetfed feature next to a feeder and a jib continue over at least a printing unit and / or at least one coating unit and / or a painting device, to print sheets. Starting from the transport direction the printed sheet seen last printing unit or coating unit or the painting device can Printed sheet with the help of a sheet transport the Boom fed to the printing press to be in the range of the boom under training of a so-called Auslegestapels be ejected from the sheetfed press.

Out In practice, it is already known a sheetfed press a Assign drying device to dry printed sheets. So the drying device can comprise a first drying module, which in the area of the boom or in the area of the boom leading sheet transport device is positioned to print out printed sheets before discharging the sheetfed press to dry. This first drying module, which in the area of the boom or in the area of the boom leading sheet transport device is also referred to as the final drying module. Farther the drying device may be an upstream of the first drying module second drying module, which also as an intermediate drying module is referred to and preferably in the range between two printing units or in the area between two coating units or painting equipment or in the area between a printing unit and a coating unit or a painting device is positioned.

These Drying modules are preferably as thermo-air drying modules executed which are preferably associated with IR emitters to the by the Thermo air caused drying assist.

During the Printing with such a sheet-fed printing machine, a so-called Machine stopper, which is also referred to as a stopper, happen. When a stopper occurs, it must be avoided that printed sheets in the area of the drying device, in particular in the area of second drying module to z. B. the hot IR emitters same, ignite, so as to avoid a paper fire.

at from the practice known printing presses when a Stopper no further air supply provided, including a fan and a heater the drying device, the promotion and temperature of the Thermo air serve to be switched off. In this case, after Elimination of a stopper and resumption of production the provision of thermo air only restart, which is why after resumption of production a relatively large amount of waste is printed. This is a disadvantage.

It There is therefore a need for a method for operating a Drying device of a printing press, with which after removal of a Stoppers and after resumption of printing the printed waste part can be reduced.

Of these, Based on the present invention, the problem is based a novel method for operating a drying device of a To create a printing machine.

This Problem is solved by a method according to claim 1. According to the invention when occurring a stopper thermo air further provided, the air supply but in the direction of the second drying module is interrupted.

At the inventive method it is proposed, when a stopper thermo air continues to provide the supply of thermal air towards the second Drying module but to interrupt.

to Further provision of thermo air will be a blower and a Heating device of the promotion and temperature of the thermo-air serve, continue to operate. The way provided air is not supplied to the second drying module, however, since the air supply to the second drying module is interrupted.

To Removal of the stopper may interrupt the supply of air be lifted in the direction of the second drying module, wherein then directly suitable tempered air for drying air Printed sheet is available so that as good as no waste part after resumption of Print production is printed.

preferred Further developments of the invention will become apparent from the dependent claims and the following description. Embodiments of the invention without being limited to this to be closer to the drawing explained. Showing:

1 : a schematic section of a sheet-fed printing machine to illustrate the inventive method; and

2 : A schematic representation of a drying device of the sheet-fed press for further clarification of the method according to the invention.

1 shows a section of a sheet-fed press in the area of a printing unit 1 , seen in the transport direction to be printed sheet seen downstream of the printing unit 1 positioned coating unit 2 and one downstream of the coating unit 2 positioned jib 3 , where printed sheets starting from the coating plant 2 the boom 3 with the help of a sheet transport device 4 be supplied.

Between adjacent printing units and coating units are in each case so-called transfer cylinders 5 positioned to print sheets to each individual printing unit 1 or coating unit 2 to be able to supply. Every printing unit 1 has a form cylinder 6 , an inking unit 7 , a transfer cylinder and a printing cylinder 9 , In addition, every printing unit 1 include a dampening unit. The coating plant 2 has a printing cylinder 9 , a form cylinder 10 , a paint application roller 11 and a paint dosing device 12 ,

The sheetfed press of the 1 is associated with a drying device, wherein in the illustrated embodiment, the drying device comprises two drying modules. A first drying module 13 is according to 1 to the boom 3 leading sheet transport device 4 assigned. This first drying module 13 is used for final drying of printed sheets before discharge of the same in the area of the jib 3 , which is why the first drying module 13 Also referred to as the final drying module. The first drying module 13 is a second drying module 14 upstream, which is also referred to as intermediate drying module. According to 1 is the second drying module 14 in an area between the printing unit 1 and the coating plant 2 positioned.

During print production, printed sheet is dried to print with both the first drying module 13 as well as with the second drying module 14 tempered thermo-air directed at the printed sheet for drying the same. This drying via thermo-air is preferably carried out by means of the drying modules 13 . 14 Assigned assigned IR emitter.

At this point it should be noted that the in 1 shown arrangement of the second drying module 14 is purely exemplary. The second drying module 14 may also be arranged downstream of a painting, which is positioned in front of a turning cylinder of the printing press.

2 shows further details of the drying device of the printing press according to 1 , wherein according to 2 the drying device is a blower 15 for conveying thermal air and a heating device 16 for the temperature control of the thermo-air includes, which via the blower 15 and the heater 16 provided air air both in the direction of the first drying module 13 as well as towards the second drying module 14 the drying device can be transported.

When a stopper occurs, the drying device of the printing press is operated in such a way that, although thermo-air is still provided, it is the thermo-air supply in the direction of the second drying module 14 is interrupted. When a stopper occurs, therefore, the fan 15 , which serves to promote the thermal air, and the heater 16 , which serves the tempering of the thermo-air, continue to operate. However, the thermal air thus provided is due to the interruption of the thermal air supply in the direction of the second drying module 14 not further the second drying module 14 supplied but the first drying module 13 supplied and / or discharged via a bypass into the environment.

To interrupt the air supply to the second drying module 14 serves a Schnellschiebereinrichtung 17 , with the help of which the air supply to the second drying module 14 can be interrupted within a few seconds. This ensures that when a stopper occurs, the air supply to the second drying module 14 can be interrupted within a very short time.

According to an advantageous development of the present invention, when a stopper occurs, not only is the heat-air supply directed towards the second thermo-air module 14 interrupted, rather, in addition with the help of a blower 18 Room air or cold air in the direction of the second drying module 14 promoted so as to effectively cool the second drying module 14 , In particular its IR emitters, and to ensure its environment. This increases security for printers operating on the press. Furthermore, the cold air of bowing or bow deflation is used. The bow defloration avoids that printed sheets come into contact with hot parts and thus can ignite.

According to 2 is between the blower 18 , which is the promotion of indoor air or cold air in the direction of the second drying module 14 serves, and the second drying module 14 a return shock device 19 positioned in regular printing operation, a discharge of thermal air in the direction of the blower 18 prevented.

After removal of a stopper and resumption of print production, the supply of thermal air is directed towards the second drying module 14 released again according to 2 the quick-shift device 17 is opened again. Furthermore, after removal of the stopper, the supply air from room air or cold air through the fan 18 stopped by the blower 18 is stopped.

Accordingly, after removal of a stopper, suitably tempered thermo-air can return to the second drying module within a few seconds 14 be fed so that after resumption of print production as good as no waste part accrues.

1

printing unit

2

coating unit

3

boom

4

Sheet transport device

5

transfer cylinder

6

form cylinder

7

inking

8th

transfer cylinder

9

pressure cylinder

10

form cylinder

11

Lacquer application roller

12

Lackdosiereinrichtung

13

drying module

14

drying module

15

fan

16

heater

17

Quick shift means

18

fan

19

check facility

Claims (8)

Method for operating a drying device of a printing press, which comprises a first drying module positioned in the region of a jib or in the region of a sheet transport device leading to the jib, in particular an end drying module, and a second drying module upstream of the first drying module, in particular an intermediate drying module, wherein during printing Drying printed print sheet thermo air on the first drying module and the second drying module is directed to the same, characterized in that at the occurrence of a stopper thermo air is still provided, but that the thermal air supply in the direction of the second drying module ( 14 ) is interrupted. A method according to claim 1, characterized in that when a stopper occurs with the aid of a quick-shift device ( 17 ) the thermal air supply in the direction of the second drying module ( 14 ) is interrupted within a few seconds. A method according to claim 1 or 2, characterized in that in this case a blower ( 15 ) for conveying the thermal air and a heating device ( 16 ) continue to operate for controlling the temperature of the thermo-air, and that one not on the second drying module ( 14 ) conveyed air volume of the first drying module ( 13 ) and / or is discharged via a bypass into the environment. Method according to one of claims 1 to 3, characterized in that after removal of the stopper, the supply of thermal air in the direction of the second drying module ( 14 ) is released again. Method according to one of claims 1 to 4, characterized in that when a stopper with the aid of a blower ( 18 ) Room air or cold air in the direction of the second drying module ( 14 ). A method according to claim 5, characterized in that the room air or cold air, the second drying module ( 14 ), in particular IR emitter thereof, and / or the environment thereof is cooled or be. Method according to claim 5 or 6, characterized that over the room air or cold air is realized a bow holddown. Method according to one of claims 5 to 7, characterized in that after removal of the stopper, the supply of room air or cold air via the blower ( 18 ) in the direction of the second drying module ( 14 ) is terminated.