Printing – Planographic – Dampeners
Patent
1997-01-09
1998-07-21
Fisher, J. Reed
Printing
Planographic
Dampeners
B41F 730, B41F 726
Patent
active
057821801
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for dampening articles, in particular to a dampening agent roller of an offset rotary printing press.
DESCRIPTION OF THE PRIOR ART
It is generally known in connection with offset printing processes to employ, besides inking units, also dampening units, for example nozzle dampening units with spray nozzles arranged next to each other in the axial direction, for dampening the printing cylinder; see, for example, U.S. Pat. No. 40 44 674. It is disadvantageous in connection with such nozzle systems that it is possible for changes in the geometry of the nozzle outlet openings to occur as a result of wear or soiling of the nozzle openings, so that a high quality print image can no longer be obtained. It is necessary to replace the nozzles to remove these deficiencies, which results in down-time for the press and loss of production.
SUMMARY OF THE INVENTION
It is the object of the invention to create a device for dampening a dampening agent roller of a rotary printing press by means of nozzles.
A device for dampening a dampening agent roller of a rotary printing press with a spray medium uses a plurality of spray nozzles that are arranged next to each other in a spray dampening unit. A spray area and an operating position is assigned to each nozzle. One magazine that is assigned to each spray area is structured to receive at least two spray nozzles. In each of these magazines at least one of the spray nozzles is held in a reserve position and can be moved from the reserve position to an operating position where it will be connected with a source of the spray medium. Each spray nozzle can be moved back to its reserve position.
The advantages of the invention reside in particular in that it is possible to make an immediate change of the spray nozzles in case of the worsening of the print image, without this resulting in a loss of production. The device in accordance with the invention is also suitable for spraying other than the articles named in the specification with dampening agent or ink, and it can be employed wherever spray nozzles might become clogged.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in detail below by means of several exemplary embodiments. The associated drawings show in
FIG. 1, a schematic representation of a cross section through a first preferred embodiment of a spray dampening device in accordance with the invention,
FIG. 2, a view taken in the direction of arrow A of FIG. 1, but without the front part of the housing and without a dampening distribution roller,
FIG. 3, a lateral view of another arrangement of the shaft of the magazines,
FIG. 4, a top view of FIG. 3,
FIG. 5, a schematic view of the representation of a second exemplary embodiment of a device in accordance with the invention, but without the housing,
FIG. 6, a schematic sectional view of a third exemplary embodiment of a device in accordance with the invention, but without the housing,
FIG. 7, a representation of FIG. 6, but with a replaced spray nozzle,
FIG. 8, a partial section taken along line VIII--VIII of FIG. 6 in an enlarged representation,
FIG. 9, a partial section taken along line IX--IX of FIG. 6 in an enlarged representation,
FIG. 10, a section taken along line X--X of FIG. 9,
FIG. 11, a schematic representation of a cross section through a device in accordance with the invention with a rotatable nozzle magazine with a special dampening agent supply line in a fourth exemplary embodiment,
FIG. 12, a schematic representation of a longitudinal section through a device in accordance with the invention with a displaceable nozzle magazine with a special dampening agent supply line in a fifth exemplary embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring initially to FIGS. 1 and 2, a shaft 3 is rotatably seated in a lateral frame 1, 2 and connected via a shaft end 4 with a drive element, not shown, for example an adjustment lever for manual operation or with a known electric motor drive. Two or more supports 6, 7,
REFERENCES:
patent: 4044674 (1977-08-01), Smith, Jr.
patent: 4469043 (1984-09-01), Kohler et al.
patent: 4719129 (1988-01-01), Caudill
patent: 4815375 (1989-03-01), Switall et al.
patent: 5438923 (1995-08-01), Schoeps
Schneider Georg
Schoeps Martin Heinz
Fisher J. Reed
Koenig & Bauer--Albert Aktiengesellschaft
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