DE19816654A1 - Compact printing machine cylinder developer device - Google Patents

Abstract

A developer device (5) is directly associated with a writing/imaging device (3) and removes particles and electrostatic forces from a printing machine cylinder (1). A device (5) for developing cylindrical surfaces in printing machines is directly associated with a writing/imaging device (3) for removing dust and silicone particles resulting from a writing/imaging operation through a suction device (8) and has a system for eliminating electrostatic attractive forces from the active faces (2) of a printing cylinder (1).

Description

The invention relates to a device for developing cylindrical surfaces in Druckma machines with at least one integrated device for describing / imaging Effective surfaces of a printing form cylinder.

When writing / imaging using a special on integrated in a printing press direction, the active surfaces of the printing form cylinder usually consist of one color pointing silicone layer and a color-guiding image layer. Are the effective areas written / illustrated, the silicone layer is converted into particles at the required points converts and thus exposes the underlying color-bearing layer. The silicone particles must who are removed in a development step that follows the description / illustration the, these in the lower lying zones, but especially in the edge areas Partially adhere silicone particles so that their removal is problematic.

According to DE 196 00 846 C1 is a device for removing the direct writing ben / images resulting silicone particles known. The device has one on the Width of the printing form extending soft rubber strip. In the direction of rotation of the printing form cylinder is behind the rubber strip a device for suction of loosened silicone particles provided, which is followed by a roller with an adhesive surface. It's white means are also provided for moistening and for traversing displacement of the Rubber strip.

The device has the disadvantage that due to the direction of rotation of the printing form cylinder Working unit arranged one behind the other and extending across the width of the printing form cylinder gane rubber strip, suction device and adhesive roller takes up a large amount of space and access to the printing form cylinder is restricted. It’s also disadvantageous that with this device only in the edge areas of the lower lying areas only loosened silicone particles that run approximately in the circumferential direction can be safely removed or lie in the front in the axial direction and in the direction of rotation of the printing form cylinder, so that additional options must be provided to ensure that the Loosened silicone particles in the edge areas are removed in the axial direction and lie behind in the direction of rotation of the impression cylinder.

Furthermore, from DE 196 00 844 is a device for removing the direct loading write / images emerging silicone particles known that spread over a width  of the printing form cylinder extending cleaning element, which with a Plastic fleece is provided. The cleaning element is an inevitably driven whale ze formed, which can be adjusted to the printing form cylinder and which leads back into a latching position is cash. The roller is arranged in a housing which, on the one hand, has a sealing lip sealed against the circumference of the printing form cylinder and on the other hand with a rotating direction of the printing form cylinder arranged behind the roller suction device verse hen is sucked through the silicone particles detached from the printing form.

This device also takes up a large amount of space and limits access to the printing form cylinder. There is also a risk that the Ge housing sealing lips against the printing form cylinder the quality of the active surfaces of the printing form cylinder are adversely affected.

The object of the invention is a device for developing cylindrical surfaces create that takes up little space and increases the effectiveness of the press.

According to the invention the object is solved by the claims.

By using electrostatic neutralization to eliminate the between the Particles arising during writing / illustration and the elec Trostatic holding forces make it possible to remove these particles from the active surfaces of the printing form remove the cylinder by suction. This procedure also has the advantage that between the developing device provided for removing the particles and the active surfaces no mechanical contact is required, so that damage to the Effective areas are excluded. Because a mechanical contact of the development facility and the effective area is not provided, is also the possibility of initiating Vibrations in the system development facility / facility for writing / Bebil excluded. This gives the opportunity to design the development facility as train separate assembly and so the device for writing / imaging directly assign. But it is also possible to develop the facility and the facility to be trained as a functional unit for writing / illustration. So that's a very com compact and space-saving training and arrangement of the development facility possible.

The invention will be explained in more detail using an exemplary embodiment. In the associated Drawing is a schematic side view of a printing form cylinder with an invent shown appropriate device.

The printing form cylinder 1 is provided with active surfaces 2 , which by means of a device 3 , for. B. can be described / illustrated by means of laser beams. The device 3 is arranged on a traverse 4 , which extends in the axial direction of the printing form cylinder 1 . To describe / illustrate the active surfaces 2 of the printing form cylinder 1 , the device 3 is mounted by means not shown in the axial direction at a distance from the active surfaces 2 ver slidably on the cross member 4 . The device 3 is assigned to a development device 5 which forcibly follows the axially directed movement of the device 3 . The development device 5 consists of a housing 6 , which encloses the device 3 for writing / imaging in the area assigned to the active surfaces 2 and extends to this without touching the active surfaces 2 . The housing 6 encloses an air chamber 7 , to which a suction 8 is assigned. The air chamber 7 , in order to eliminate the existing between the writing / imaging of the active surfaces 2 by the device 3 , the dust and silicone particles and the active surfaces 2 existing electrostatic holding forces, ions, whereby an electrostatic neutralization of the particles and Effective areas is realized. Enriching the air chamber 7 with ions can be done by z. B. through an unillustrated supply line, an ionized gas or ionized air into the air chamber 7 and thus a neutralization is realized. However, commercially available ionizers 9 can also be provided in the air chamber 7 , which ionize the air flowing into the air chamber and thus bring about an electrostatic neutralization. Instead of the ionizers 9 , whose direction of action is directed towards the active surfaces 2 in a region downstream of the device 3 in the direction of rotation 11 of the printing form cylinder 1 , discharge electrodes 10 can also be provided, which electrostatically neutralize the particles formed during the writing / imaging and the active surfaces 2 and so on allow removal of these particles through the suction 8 . It is also possible to electrostatically charge the active surfaces 2 by means known per se and to provide the discharge electrodes 10 with a reverse polarity. The particles formed during writing / imaging are thus detached from the active surfaces 2 by the electrostatic forces and removed by the suction 8 .

Reference list

1

Printing form cylinder

2nd

Effective area

3rd

Device for describing / imaging

4th

traverse

5

Development facility

6

casing

7

Air chamber

8th

Suction

9

Ionizer

10th

Discharge electrode

11

Direction of rotation

Claims (8)

1. Device for developing cylindrical surfaces in printing machines

• - With at least one device ( 3 ) for describing / imaging active surfaces ( 2 ) of a printing form cylinder ( 1 ),
• - And a developing device ( 5 ) for removing the dust and silicone particles that occur during writing / imaging,
• - The development device ( 5 ) is directly associated with the device ( 3 ) for describing / imaging,
• - The development device ( 5 ) has to eliminate the existing between the dust and silicone particles and the active surfaces ( 2 ) existing electrostatic holding forces means for electrostatic neutralization
• - And a suction ( 8 ) for removing the dust and silicone particles.

2. Device for developing cylindrical surfaces in printing machines

• - With at least one device ( 3 ) for describing / imaging active surfaces ( 2 ) of a printing form cylinder ( 1 ),
• - And a developing device ( 5 ) for removing the dust and silicone particles that occur during writing / imaging,
• - The development device ( 5 ) is directly associated with the device ( 3 ) for describing / imaging,
• - The development device ( 5 ) has means for electrostatically charging the active surfaces ( 2 )
• - And electrodes provided with a reverse polarity ( 10 )
• - And a suction ( 8 ) for removing the dust and silicone particles.

3. Device according to claim 1

• - With a connection for supplying an ionized gas or air to the developing device ( 5 ).

4. Device according to claim 1

• - With the development device ( 5 ) associated ionizers ( 9 ) or discharge electrodes ( 10 ).

5. Device according to claim 1 or 2

• - With a development device ( 5 ) having an air chamber ( 7 ) enclosing housing ( 6 ).

6. Device according to claim 1 or 2

• - With a housing ( 6 ), which includes the device ( 3 ) for writing / imaging in the active surfaces ( 2 ) facing area
• - And extends to the active surfaces ( 2 ) without touching them.

7. Device according to claim 1

• - With a housing ( 6 ) in which the ionizers ( 9 ) or the discharge electrodes ( 10 ) are arranged.

8. Device according to claim 1

• - With in the housing ( 6 ) arranged ionizers ( 9 ) or discharge electrodes ( 10 ), whose direction of action is directed to a region of the active surfaces ( 2 ), which is arranged in the direction of rotation of the printing form cylinder ( 1 ) of the device ( 3 ) for writing / imaging is.