JP3027706U - Cleaning device for printing section of printing machine - Google Patents

Abstract

(57) Abstract: In a cleaning device for a printing section of a printing press, an accurately metered cleaning program using a fresh cleaning medium is made possible with low technical cost, and cleaning is performed after completion of the cleaning process. Be sure to prevent the media from hanging down. A cylinder (6) is provided in a supply pipe (4) separately from a cleaning medium supply, and a piston (8) movable by a pneumatic or electric drive means (10) is provided in the cylinder. Is pulled back in the cylinder 6 by the drive means 10 via the control device after the supply of the cleaning medium is stopped, whereby the cleaning medium is supplied to the nozzle 1
It is designed to suck back from 2.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention is a cleaning device for a printing section of a printing machine, which supplies a supply pipe having an outlet nozzle for spraying the cleaning medium onto the cylinder and a cleaning medium under an overpressure to the supply pipe in a metered manner. Of the type having a control device for.

[0002]

[Prior art]

 A cleaning device of said type is known from DE-A 2504572 C2, in which a cleaning medium from a storage container is introduced under pressure into a chamber via a control device to compress a piston. Move it back against the force of the spring. The second piston is moved by this piston movement, and the cleaning medium existing in the second chamber is pushed out onto the cylinder through the nozzle. In order to prevent the nozzle from dripping, the control device is switched so that the fresh cleaning medium is not caused to flow, but the first piston is moved through the compression medium and the cleaning medium present there is introduced into the conduit. Is pushed into the chamber in front of the second piston. At the same time, the cleaning medium is sucked back from the outlet nozzle and the supply pipe and introduced into the second chamber. The cleaning medium is maintained in the second chamber, for example until the next cleaning process, which takes place over the weekend after a few days. Since the second chamber is connected to the outside air and is only partially filled, part of the cleaning medium evaporates. Furthermore, the construction of the known device is extremely large and does not allow an accurate metered delivery of fresh washing medium.

[0003]

[Problems to be solved by the device]

 The object of the present invention is to improve the cleaning device starting from the known technology, to enable an accurately metered cleaning program with fresh cleaning medium at a low technical cost and after the cleaning process has ended. This is to prevent the dripping of the cleaning medium.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the configuration according to the present invention, a cylinder is arranged in the supply pipe separately from the cleaning medium supply, and the cylinder is movable by pneumatic or electric drive means. A piston is provided, and after the supply of the cleaning medium is stopped, the piston is pulled back in the cylinder by the driving means via the control device, whereby the cleaning medium is sucked back from the nozzle.

[0005]

[Effect of device]

 With the above-mentioned configuration according to the present invention, the nozzle is prevented from being reliably drooped with a small structure and at a low cost, and the cleaning medium is sucked back from the front part of the nozzle, and as a result, the highest point of the nozzle is exceeded. Runoff no longer occurs. The device based on this idea can also be installed in existing cleaning devices.

In an advantageous configuration of the invention, pneumatic cylinders or electromagnets are provided as drive means. Such a drive means may be connected to the control device, for example via an electrical path, so that when the supply of cleaning medium is stopped, the drive means is automatically switched over and the piston drives the cleaning medium out of the nozzle. Suck back. When the cleaning device is activated again, the piston pushes the cleaning medium back into the supply pipe, so that the cleaning program is run in the manner already described.

In an advantageous further development of the invention, a cylinder is provided at the end of the supply pipe, the stroke chamber of the cylinder extending over an extension of the inner chamber of the supply pipe. Instead of a closure cap at the end of the supply pipe, the cylinder is simply screwed on and connected to the control device.

[0008]

[Embodiment of device]

 In the cylinder of the inking unit (not shown) of the printing press, the cleaning medium 3 is brought to the peripheral surface of the cylinder 1 via a plurality of outlet nozzles 2 arranged over the length of the cylinder. A supply pipe 4 is attached to the outlet nozzle, and fresh cleaning medium is supplied to the supply pipe, for example via the supply pipe 5. The supply pipe 5 is connected to a control device (not shown), in which the cleaning medium supply is controlled, for example via an electrically operable valve.

A cylinder 6 may be screwed onto the thread 7 of the supply pipe 4 separately from the cleaning medium supply. The cylinder 6 in this case extends on an extension of the supply pipe 4. A piston 8 is arranged in the cylinder 6 and is connected to a drive means 10 via a piston rod 9. The drive means 10 may be, for example, a pneumatic cylinder, an electromagnet, or an electric motor. The drive means 10 is connected to the cylinder 6 via a fitting 11.

FIG. 2 shows the piston 8 in the returned position, in which the cleaning medium supply is interrupted. In this case, the stroke chamber 12 is filled with the cleaning medium sucked back from the front part of the nozzle 2. When the liquid level 13 of the cleaning medium in the nozzle 2 reaches the lower side of the highest point of the nozzle 2, the cleaning medium does not drop undesirably. The stroke chamber 12 is configured to correspond to the number of nozzles 2 and the volume of suction of the cleaning medium. In FIG. 3, the piston 8 is moved to the left side, and the cleaning medium existing in the stroke chamber 12 is pushed back into the supply pipe 4, and the cleaning process of the inking device is performed at this position.

In the embodiment shown in FIG. 4, the cylinder 6 is arranged in the supply conduit 5 between the control device and the supply pipe 4 and the same effect is obtained in this case.

In the example shown in FIG. 5, a cleaning medium based on vegetable oil is used. Two supply lines 5 are provided in this case, one for the washing medium and the other for the water for the post-wash. Both piston rods 9 are connected to each other via a bridge 14. The drive means 10 is engaged with the bridge 14.

[Brief description of drawings]

FIG. 1 is a sectional view of a supply pipe having an outlet nozzle.

FIG. 2 is a partial vertical cross-sectional view of the supply pipe in a state where the supply of the cleaning medium is stopped.

FIG. 3 is a diagram showing a piston position during a cleaning process.

FIG. 4 is a side view of another embodiment.

FIG. 5 is a partial cross-sectional view of an embodiment with dual feed conduits.

[Explanation of symbols]

1 barrel, 2 outlet nozzles, 3 cleaning medium,
4 supply pipes, 5 supply conduits, 6 cylinders,
7 Threads, 8 Pistons, 9 Piston Rods, 10 Driving Means, 12 Stroke Chambers, 13
Liquid level, 14 bridge

Continued Front Page (72) Creator Gärhard Roth Mannheim Kimseestraße 92 Germany

Claims (5)

[Scope of utility model registration request] 1. A cleaning device for a printing section of a printing press, comprising: a supply pipe having an outlet nozzle for spraying a cleaning medium onto a cylinder; A control unit for controlling the cleaning medium, a cylinder (6) is provided in the supply pipe (4) separately from the cleaning medium supply, and pneumatic or electric drive means is provided in the cylinder. A piston (8) movable by (10) is provided, which piston is pulled back in the cylinder (6) by the drive means (10) via the control device after the supply of the cleaning medium is stopped, whereby the cleaning is performed. A cleaning device for a printing section of a printing press, characterized in that the medium is sucked back from the nozzle (12). 2. Cleaning device according to claim 1, characterized in that a pneumatic cylinder or an electromagnet is provided as drive means (10) for the movable piston (8). 3. A cylinder (6) is provided at the end of the supply pipe (4), the stroke chamber (12) of the cylinder (6) extending on an extension of the inner chamber of the supply pipe (4). The cleaning device according to claim 1 or 2. 4. Cleaning device according to claim 1, wherein a cylinder (6) is provided in the supply conduit (5) between the control device and the supply pipe (4). 5. The cylinder (6) has two pistons (8) for the cleaning medium and water, the pistons being connected to the drive means (10) via one bridge (14). The cleaning device according to claim 1 or 2.