Printing – Antismut device – Anti-offset material application
Patent
1998-07-16
2000-05-30
Hilten, John S.
Printing
Antismut device
Anti-offset material application
101483, B41F 3500
Patent
active
060679085
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method keeping clean a nozzle mouthpiece of a nozzle of a spray moistening device of a rotary printing press; the and to a device for executing the method.
DESCRIPTION OF THE PRIOR ART
A spray moistening device with spray nozzles, which are arranged next to each other in the axial direction on a so-called spray beam for moistening a printing cylinder of an offset rotary printing press, is known from U.S. Pat. No. 4,044,647.
U.S. Pat. No. 4,241,656 discloses a self-cleaning nozzle of a spray moistening device for a rotary printing press. Here, a moistening agent is swirled with air after exiting from a nozzle mouthpiece.
EP 0 126 536 A2 describes a pushbutton for a ink jet printer. The ink reservoir, the nozzle plate and nozzle bores arranged therein are cleaned by means of ultrasound excitation. The ultrasound excitation is activated during the cleaning operation.
DE 31 08 541 A1 discloses a device for generating a moistening agent fog for a moistening device of an offset printing press, using an ultrasound atomizer.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a method for keeping the nozzle mouthpieces of a spray moistening device clean, as well as an associated device, by means of which it is possible to perform preventive maintenance on spray nozzles of a spray moistening device without having to remove them.
This object is attained in accordance with the present invention by periodically activating the moistening agent that is supplied to the nozzle mouthpieces of the spray moistening device by the use of ultrasound upstream of, or in the nozzle mouthpieces. An ultrasound vibration transmitter is in communication with the fluid either in an upstream fluid chamber, or at the nozzle mouthpiece;
The advantages which can be achieved by means of the present invention lie, in particular, in that the fluid conducted through the nozzles can be activated by means of ultrasound because of the arrangement of a moistening agent, which in the operational state, is not activated by ultrasound during a spraying process and is charged with pressure, or respectively by an ultrasound vibration transmitter, which can be switched on during a cleaning process. When the fluid activated by ultrasound exits through the nozzles, the paper and ink particles on the nozzle outlet opening, or respectively on the nozzle mouthpiece, are removed.
In this way, it is easily possible to perform preventive cleaning of the spray nozzles without having to remove the nozzles. A long, trouble-free operation of the moistening device is made possible by the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is represented in the drawings by two preferred embodiments and will be described in more detail in what follows. Shown are in:
FIG. 1, a cross section through the schematic representation of a spray nozzle unit with a device; in accordance with a first preferred embodiments of the present invention; and
FIG. 2, a detailed representation of a spray nozzle with a device in a second preferred embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A nozzle unit 1 of a spray moistening device for moistening objects, such as, in particular a rotatable moistening distribution roller, consists of a nozzle housing 2, which is fastened by means of fastening elements, for example screws, on a first sheet metal plate 4 of a vibration-damping plate generally at 6. The vibration-damping plate 6 is arranged by means of screws on a crosspiece 9 of a nozzle beam. crosspiece 9 receives a plurality of nozzle units 1 arranged at a distance next to each other.
The nozzle housing 2 has a chamber 11, which extends in the interior of nozzle housing 2 in the horizontal direction, for example, and which is bordered on one side by a nozzle mouthpiece 13, held in place by a union nut 12, and a nozzle 14 fastened thereon. On its side opposite the nozzle mouthpiece 13, the chamber 11 is bordered by a coil holder 16, tha
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Hilten John S.
Koenig & Bauer--Albert Aktiengesellschaft
Nguyen Anthony H.
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