Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F35/00—Cleaning arrangements or devices
  • B41F35/06—Cleaning arrangements or devices for offset cylinders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
  • B41P2235/00—Cleaning
  • B41P2235/10—Cleaning characterised by the methods or devices
  • B41P2235/20—Wiping devices
  • B41P2235/22—Rollers

Definitions

• the invention relates to a device for cleaning a cylinder surface in a printing press, with a cleaning surface for contacting the cylinder surface, which cleaning surface can be rotated by a motor about an axis of rotation parallel to the axis of the cylinder to be cleaned.
• An adjusting device ensures that the cleaning surface can be placed against the cylinder surface and can be switched off as required.
• Such or similar cleaning devices are necessary in printing machines in order to wash off ink residues and paper dust as well as other contaminants from the cylinders involved in the printing, but also from other cylinders of the printing machine that come into contact with the printing material, unless this is done in the traditional way Hand is supposed to happen.
• printing machines are nowadays equipped with such cleaning devices.
• Brush rollers for example, are used as the cleaning surface for contacting the cylinder surface, which are arranged parallel to the cylinder to be cleaned and turned on or off on the cylinder.
• the brush roller is set in rotation by a motor, that is usually hydraulically, pneumatically or by means of an electric motor.
• the brush roller is rotated against the cylinder surface, usually during the operation of the printing press, sometimes even during production, in order to clean it.
• the dirt removed from the cylinder surface with the brush roller which is normally dissolved by water and / or detergent and mixed with these washing liquids, is scraped off with a doctor blade and collected in a tub.
• BESTATIGUNGSKOPIE In addition to the cleaning devices mentioned at the outset, there are those which operate on a different principle, namely with a washcloth which is placed against the cylinder surface to be cleaned and which wipes the dirt from the cylinder surface due to the rotational movement thereof.
• a feed device In cooperation with a winding and unwinding device for the wash cloth, a feed device ensures that the section of the wash cloth that comes into contact with the cylinder surface is continuously renewed.
• this principle is maintenance-intensive since the washcloth has to be replaced regularly.
• cloth roll systems are heavy, so that cleaning devices cannot be removed by one person according to this principle.
• Another known principle for mechanically cleaning a cylinder surface in a printing press would be a simple doctor blade, which is placed on the cylinder surface in order to scrape off the dirt directly from it. In this way, high contact forces can be achieved to remove hard dirt, but the cleaning result is usually not optimal.
• the present invention is therefore based on the object of improving a cleaning device of the type mentioned at the outset with regard to the best possible use of the user, by combining advantages of different functional principles of known cleaning devices.
• a known device of the type mentioned at the outset is therefore fundamentally modified in accordance with the present invention in that a stepping drive is provided for motorized rotation of the cleaning surface to gradually change the angular position of the cleaning surface with respect to the axis of rotation parallel to the axis of the cylinder to be cleaned.
• This step drive can in particular be operated pneumatically, hydraulically or electrically.
• This measure according to the invention thus modifies the principle known from the devices with rotating brush rollers of a cleaning surface which can be adjusted to the cylinder surface and is rotated by a motor about an axis of rotation parallel to the cylinder axis, in addition to the advantages of a simple doctor blade, namely the possibility of hard application - Lens as well as the simple adjustment or the elimination of the need for readjustment in the event of wear.
• the invention makes use of the fact that the cylinder surface to be cleaned generally rotates during the cleaning process, and therefore a rotation of the cleaning surface of the cleaning device is not necessary to generate a relative movement against the cylinder surface. Instead, only the angular position of the cleaning surface is changed in order to always bring a fresh piece of cleaning surface to the cylinder surface.
• the invention offers the advantage that in newspaper web printing machines, both in the print-on position and in the print-off position, can be cleaned at full production speed, specifically cylinder surfaces with and without paper contact.
• the gradual advance of the cleaning surface by gradually changing its angular position with respect the axis of rotation is preferably clocked.
• the clocked advance of the cleaning surface enables a relatively hard adjustment to the cylinder surface, so that complex adjustment work for the adaptation of the cleaning surface to the cylinder surface and readjustment work are unnecessary.
• the cleaning surface can be formed as the outer surface of a cylinder, for example also as a brush roller, or just a cylinder segment.
• cleaning surfaces can also be present, each of which then forms a cylindrical segment lateral surface.
• a brush surface can be combined with a sponge surface and a cloth.
• the brush surface can be equipped with hard bristles for the quick detachment of the boundary layer of dirt on the cylinder surface, followed by a cloth or sponge surface for wiping the loosened dirt layer.
• Other cleaning surfaces can consist of sponge cloths, microfiber materials and / or brushes of different hardness or softness.
• all cylinder segments can also be covered with a single type of cleaning surface, it then being possible, for example, to replace only one cylinder segment for maintenance purposes while the remainder of the device is installed and even remains operational.
• the cylinder segments or their lateral surfaces according to this preferred embodiment of the invention can be shaped and arranged such that they are not arranged coaxially to the axis of rotation, but rather form the shape of a circular piston in cross section.
• a quick-change system comprises, in particular, quick-release fasteners with axial and radial locking elements, as are known per se, for example for attaching printing plates to a printing cylinder.
• the entire device In order to replace a cleaning surface due to wear or excessive contamination or to clean it outside the cleaning device, the entire device does not have to be removed as a result, but only the cleaning surface in question is removed using the quick-change system and replaced if necessary. The rest of the device even remains operational.
• the profile or frame used here can consist of extruded aluminum; however, it may be advantageous for weight reasons to manufacture the profile from carbon fiber. As a result, the entire device can then be removed and assembled in one-man operation.
• a doctor blade and / or wringing device can be assigned to the cleaning surfaces of the device according to the invention, this preferably acting on a cleaning surface which is not placed against the cylinder surface to be cleaned and which frees it from the cleaned dirt and the washing liquids. After a further gradual twisting of the cleaning surface, this piece can then be used freshly again for positioning against the cylinder surface to be cleaned.
• a spray device for spraying the cylinder surface and / or the cleaning surface with washing liquids can be present, as is known per se in the form of a separate spray tube.
• the washing liquids can also be brought to the cleaning surface inside the above-mentioned profile or frame and brought through them into the contact area between the cleaning surface and the cylinder surface to be cleaned, so that a distributor device for washing liquids is integrated into the cleaning surface.
• the stepping drive of the device according to the invention comprises a ratchet or ratchet mechanism, which is preferably associated with a hydraulic or pneumatic piston-cylinder unit.
• the cutting drive can also be an electric stepper motor, which, however, is disadvantageous in terms of its weight compared to the simpler ratchet or ratchet mechanism.
• a uniform piston stroke of the piston-cylinder unit is transferred to the cleaning surface via the ratchet or ratchet mechanism in such a way that the cleaning surface is fed in cycles, rotating with respect to the axis of rotation parallel to the axis of the cylinder to be cleaned.
• FIG. 1 shows a perspective view of a first exemplary embodiment of a device according to the invention
• FIG. 2 an exploded view of the device from FIG. 1;
• FIG. 3 a detail from FIG. 1, in a slightly changed perspective
• Fig. 4 a schematic side view of a second embodiment.
• FIG. 1 shows, in perspective, an exemplary embodiment of a device according to the invention, which, like conventional washing machines in web offset printing presses, is positioned on the cylinder surface to be cleaned (likewise not visible here) by means of an adjusting mechanism which is known per se and is therefore not shown here.
• This adjustment mechanism usually comprises two short-stroke cylinders, each of which is attached to a side plate in the printing press.
• the device shown in FIG. 1 comprises four cleaning surfaces 1, each of which is designed as a jacket surface of a cylinder segment and together forms a complete cylinder jacket.
• a pneumatic Stepping drive which consists of a pneumatic short-stroke cylinder 2, a linkage 3 and a commercially available ratchet mechanism 4, the cleaning surface 1 is clocked past the rotating cylinder surface to be cleaned.
• the up and down movement of the pneumatic short-stroke cylinder 2 is converted via the linkage 3 into a rotary movement of the ratchet mechanism 4, so that depending on the position of its actuating device 5, with each stroke of the short-stroke cylinder 2, the cleaning surface 1 is advanced, that is to say a change in it Angular position with respect to the axis of rotation running through the center of the ratchet mechanism 4, in or against the direction of rotation of the cylinder surface.
• the ratchet mechanism 4 latches into the corresponding position after each stroke of the short-stroke cylinder 2 and holds the cleaning surface 1 in a defined angular position.
• This advance of the cleaning surface 1 repeatedly brings an area with fresh, unused cleaning surface into contact with the cylinder surface, whereby on the one hand the dirt is already partially removed and on the other hand clean cleaning surface is always available to ensure clean material transport.
• a spray tube 6 ensures that washing liquids are sprayed onto the cylinder surface to be cleaned, specifically in the area in which the cleaning, that is to say the contact between the cleaning surface 1 and the cylinder surface, takes place.
• washing liquid could also be introduced from the inside through the cleaning surfaces 1 into the contact area between the cleaning surface 1 and the cylinder surface to be cleaned.
• the cleaned and entrained dirt on the cleaning surface 1 and the remaining washing liquids are guided to a doctor device 7 due to the constant clocked feed and are stripped and / or wrung out there. This ensures constant self-cleaning and reconditioning of the respective cleaning surfaces 1.
• the doctor blade 7 is carried by a number of doctor blade holders 8, which vary in number depending on the width of the device.
• the depth of engagement of the squeegee and the associated intensity of self-cleaning is carried out by means of installation screws 9.
• the individual parts of the device according to the invention just described are held by a frame which essentially consists of two side cheeks 10, a holding profile 11 and a tubular profile 12.
• the cleaning surfaces 1 are fastened to the tubular profile 12 by means of axial and radial locking elements 13, which form quick-release fasteners of a quick-change system. Because of this quick-change system, those cleaning surfaces 1 which require external cleaning or renewal in the course of prolonged use can be removed or replaced even when the device is installed.
• Fig. 3 shows an enlargement of one side of the device shown in Fig. 1 for further clarification of its principle of operation.
• the ratchet mechanism 4 acts through the side cheek 10 on the tubular profile 12 mounted on the side cheek 10, which moves as soon as the short-stroke cylinder 2 carries out a lifting movement via the linkage 3.
• Fig. 4 shows a schematic representation of a second embodiment of a device according to the invention.
• a brush surface 1 a fabric covering 1 'and a sponge covering 1 ", a frame with a circular piston is provided in cross-section, with a coaxially arranged stepping motor 14 acting as a step drive.
• a doctor blade or wringing roller 7 and a spray tube 6 for washing liquids 15 complete the device for cleaning a cylinder surface 16.
• the device shown in FIG. 4 makes it possible to brush off hard dirt build-up on the cylinder surface 16 with the hard brush surface 1, to cleanly remove the residual dirt by means of a sponge covering 1 "and to dry it by means of a cloth covering 1 '.
• a quick-change system is easy to use - And dismantling the cleaning surfaces 1, 1 ', 1 "for use.
• the present invention is thus a new type of cleaning device which can be used universally for cleaning, in particular, blanket cylinders in newspaper, commercial and floor printing machines.
• a brush or cloth system this is a combination of these principles, whereby both brushes and cloths as well as additional cleaning media such as sponges, microfibers or the like can be used as cleaning surfaces.

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• Inking, Control Or Cleaning Of Printing Machines (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34894857

Family Applications (1)

Country Status (4)

Cited By (4)

Families Citing this family (2)

Citations (4)

Family Cites Families (5)

• 2005
  • 2005-02-15 JP JP2006553510A patent/JP2007522962A/ja active Pending
  • 2005-02-15 DE DE502005010104T patent/DE502005010104D1/de active Active
  • 2005-02-15 WO PCT/EP2005/001502 patent/WO2005082626A1/de active Application Filing
  • 2005-02-15 EP EP05707396A patent/EP1727681B1/de not_active Expired - Fee Related

Patent Citations (4)

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