JP2008183901A - Method and apparatus for cleaning plate cylinder and roller in printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus related for cleaning plate cylinders and rollers in a printer, especially the method and the apparatus capable of remarkably decreasing down time in an operating mode "cleaning the rollers (and the plate cylinders)". <P>SOLUTION: In this method for cleaning, for cleaning a dampening apparatus 5, a dampening water container 13 in which dampening water is stored moves from a first operating position for operating printing in which a dampening water doctor 12 is immersed in the dampening water to a second operating position. After cleaning is executed, the down time can be remarkably decreased by either retaining the dampening water container 13 in which the dampening water is stored at the second operating position as it is or returning it to the first operation position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printing machine, and more particularly to a method and apparatus for cleaning cylinders and rollers in an offset printing machine.

Patent Document 1 discloses a cylinder and roller cleaning method capable of cleaning a dampening device roller group. The dampening device roller group is integrated into the inking device roller group via a bridge roller for cleaning. At this time, the dampening roller can be separated from the plate cylinder.
In Patent Document 2, the dampening solution doctor immersed in the dampening solution container is driven at a rotational speed that is temporarily higher than that during the printing operation using another drive device. A method for cleaning cylinders and rollers in a printing press is disclosed. To perform this method, remove the dampening solution from the dampening solution container or place the dampening solution doctor in the dampening solution container so that it is not immersed in the dampening solution remaining in the dampening solution container. It is necessary to reduce the amount of dampening water. These methods are relatively expensive.

Patent Document 3 discloses a dampening device including a dampening water container capable of closing a weir. Thereby, the fountain solution can be discharged from the fountain solution container in a relatively short time if necessary.
German Patent Invention No. 19501806 German Patent Invention No. 19645169 German Patent Invention No. 29505355

  An object of the present invention is to provide a method and apparatus capable of significantly reducing downtime, particularly in an operation mode of “roller (and cylinder) cleaning”.

  This problem can be solved by the configurations and features of claims 1 and 2. Developments are defined by the dependent claims.

The printing apparatus of the offset printing machine is preferably configured to be able to clean the plate cylinder / plate cylinder and the dampening apparatus roller group in addition to the ink apparatus roller group. The inking roller group, plate cylinder / plate cylinder and dampening roller group can be controlled to be treated individually or group by group or together in a cleaning process. In the operation mode of “roller cleaning”, the dampening device wheel group is integrated with the inking device roller group via the bridge roller. For this purpose, the inking device roller and the dampening device roller are configured to be separated from the plate cylinder / plate cylinder.
The dampening roller of the dampening device roller group can selectively contact the plate cylinder / plate cylinder in the cleaning process.
In the cleaning process, it is desirable to use a vegetable cleaning agent and / or water as the cleaning liquid, and this cleaning agent and / or water can be placed in the inking device using a spray device.

The amount of dampening water required for the printing operation remains appropriately in the dampening water container, particularly in order to reduce downtime (stopping time) due to cleaning of the dampening device roller group or printing interruption. Therefore, the fountain solution is not removed or discharged to such an extent that the fountain solution doctor cannot contact the fountain solution. The first advantage is that the dampening solution can be removed or removed by moving the dampening solution container with the full amount of dampening solution (for printing operation) out of the contact area of the dampening solution doctor. It is possible to avoid downtime or downtime for at least partially draining and refilling with dampening water after the cleaning step.
For example, a dampening water container containing dampening water is lowered below the dampening water doctor and raised again after the cleaning process so that the dampening water doctor for printing operation can come into contact with the dampening water again. Can be. Alternatively, the dampening solution container containing the dampening solution is arranged tangentially to the dampening solution doctor and away from the dampening solution doctor.

  The second advantage is that the cleaning process of the rollers in the dampening device roller group and / or the inking device can be started earlier by eliminating the downtime or the stationary time, thereby achieving a significant improvement in the roller cleaning result. It can be done. In this case, the plate cylinder can also be incorporated into the cleaning process by maintaining the dampening roller in contact with the plate cylinder during the cleaning process.

  Hereinafter, the present invention will be described in detail with reference to the drawings based on one embodiment.

  The printing apparatus basically comprises one inking device 6, one dampening device 5, one plate cylinder / plate cylinder 1, and one rubber cylinder 2. The rubber cylinder 2 is operatively connected to a sheet guide cylinder (represented as an impression cylinder 4 in this figure) that conveys the sheet in the conveying direction 3, thereby forming a printing gap 7.

  The inking device 6 can be contacted / released with a roller group (in the figure, the cross section is shaded) including an ink groove, an ink doctor, an ink transfer roller, and an ink kneading roller, and a plate cylinder / plate cylinder 1. A form roller (shown as an ink form roller 9 in the figure) disposed at the end is provided.

  A spray device 14 operable with a vegetable cleaning agent and / or water is disposed in the inking roller group. The spray device 14 is connected to the machine controller in circuit and data technology and is preferably controllable by a control station.

  A blade device 15 configured to be able to contact and release the last roller is disposed on the roller of the inking device 6 positioned last in the rotation direction of the plate cylinder / plate cylinder 1. The blade device 15 is preferably connected to an operating device having a gear mechanism connected to a machine control unit in terms of circuit technology and data technology, and can be controlled by a control station.

  The dampening device 5 is placed in front of the inking device 6 in the direction of rotation of the plate cylinder / plate cylinder, if necessary. The dampening device 5 is provided with at least one application roller that can be brought into contact with and released from the plate cylinder / plate cylinder 1, and is configured as a dampening application roller 8 in this embodiment. The dampening device 5 is further provided with at least one dampening solution doctor 12 which is immersed in the dampening solution container 13 and scoops out dampening solution in the dampening solution container 13 as is well known. . If necessary, the surveying roller 11 can be applied to the fountain solution doctor 12, and at least one rider roller can be applied to the fountain solution application roller 8. In this embodiment, one of the rider rollers functions as a bridge roller 10, 10 '. The bridge roller is provided on the dampening roller 8 as a rider roller at the reference numeral 10 '. The bridge roller is connected to the ink device 6 at the reference numeral 10 and to the first ink roller 9 in this embodiment. It is possible. The dampening device 5 is provided with a dampening water doctor 12 connected to another driving device capable of controlling the number of rotations, along with dampening wet roller 8 and bridge rollers 10, 10 '. In this embodiment, the fountain solution doctor 12 is in contact with the surveying roller 11.

  After the roller group of the inking device 6 has been washed, or after the roller group of the inking device 6 has been washed together with the roller group of the dampening device 5, the bridge roller 10 ′ in contact with the dampening roller 8 is operated. It is connected to the inking device 6 for the mode “roller cleaning” (bridge roller 10). As a result, the roller group of the dampening device 5 is incorporated into the roller group of the inking device 6. At the same time, the fountain solution container 13 containing the fountain solution moves from the first operation position for printing operation where the fountain solution doctor 12 is immersed in the fountain solution to the second operation position for cleaning. The contact of the fountain solution doctor 12 with the fountain solution container 13 with no change in the amount of fountain solution is interrupted. Thereafter (the fountain solution container is located at the second operating position), cleaning is performed, and then the fountain solution container 13 remains in that position (position 13 ') or the first operating position. Return to (position 13).

If necessary, the spray device 14 is operated by a predetermined working method. Further, the fountain solution doctor 12 is also operated, and the fountain solution doctor 12 is driven at a predetermined rotational speed. At the same time, when the machine speed of the printing apparatus is set to a predetermined rotation speed and the machine speed reaches that rotation speed, the rotation speed of the dampening roller 8 driven by the plate cylinder / plate cylinder 1 is dampened. Synchronize with the water doctor 12. Alternatively, the plate cylinder / plate cylinder 12 is mechanically disconnected from the mechanical drive and can be synchronously or asynchronously provided by a separate drive connected to the machine controller in terms of circuit technology and data technology. Can be driven.
The mixture of ink and cleaning liquid is wiped off via the blade device 15 in contact with the inking device roller.
When the cleaning process is completed, the dampening solution container 13 containing the remaining dampening solution contacts the dampening solution doctor 12 so that the dampening solution doctor 12 can be immersed in the dampening solution and the operation of the printing press can be resumed. .

  The apparatus for cleaning the cylinder and the rollers in the printing press is provided with a fountain solution container 13 connected to the operating device via a gear device. The fountain solution container 13 in which all of the fountain solution for the printing process is stored is from the first operation position for the printing operation in which the fountain solution doctor 12 is immersed in the fountain solution by the operation device. The dampening device 5 can be moved to a second operation position (fountain solution container 13 ′) for cleaning. In this second operating position, the fountain solution container 13 ′ and the fountain solution have no functional relevance to the fountain solution doctor 12. When the dampening device 5 is cleaned, the dampening water container 13 containing dampening water next maintains the second operating position (dampening water container 13 ′ in FIG. 1) or the first dampening water container 13 It can be moved to the operating position (dampening water container 13 in FIG. 1).

In one configuration, the fountain solution container 13 is disposed below the fountain solution doctor 12 so as to be lowered.
In other configurations, the fountain solution container 13 can be lowered tangent to the fountain solution doctor 12 and below the fountain solution doctor 12.
In yet another configuration, the fountain solution container 13 can be lowered onto the curved guide and below the fountain solution doctor 12.

1 is a printing apparatus of an offset printing machine according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder / plate cylinder 2 Rubber cylinder 3 Conveyance direction 4 Impression cylinder 5 Dampening device 6 Inking device 7 Printing gap 8 Dampening wet roller 9 Inking roller 10 Bridge roller 11 Surveying roller 12 Dampening water doctor 13 Dampening water Container 14 Spray device 15 Blade device

Claims (5)

One ink device roller group provided with a spray device and a blade device, a dampening water doctor and a dampening water doctor immersed in a dampening water container containing dampening water, and a switchable one. In a method of cleaning a cylinder and a roller in a printing press comprising at least one dampening device roller group integrated into the inking device roller group by two bridge rollers,
The dampening water container (13) in which dampening water is stored is connected to the dampening device (5) from the first operating position for printing operation in which the dampening water doctor (12) is immersed in dampening water. Moving to a second operating position for cleaning and maintaining the second operating position after cleaning or returning to the first operating position. One ink device roller group provided with a spray device and a blade device, a dampening water doctor and a dampening water doctor immersed in a dampening water container containing dampening water, and a switchable one. In an apparatus for cleaning a cylinder and a roller in a printing press comprising at least one dampening device roller group integrated into the inking device roller group by two bridge rollers,
The fountain solution container (13) is connected to an operating device via a gear device,
The dampening water container (13) containing dampening water is dampened from the first operating position for printing operation where the dampening water doctor (12) is immersed in dampening water by the operating device. It is possible to move to the second operating position for cleaning of the device (5) and to maintain the second operating position after cleaning or return to the first operating position. A device characterized by that.   Device according to claim 2, characterized in that the dampening solution container (13) can be lowered below the dampening solution doctor (12).   The apparatus according to claim 2, characterized in that the dampening solution container (13) is lowered in the tangential direction of the dampening solution doctor and below the dampening solution doctor (12).   Device according to claim 2, characterized in that the fountain solution container (13) is lowered on the curved guide and below the fountain solution doctor (12).

Images