Printing – Antismut device
Patent
1996-08-30
1999-06-29
Burr, Edgar
Printing
Antismut device
101419, 271195, B41F 128
Patent
active
059153040
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a device for guiding freshly coated sheets over a continuous guidance surface in a processing machine.
DESCRIPTION OF THE PRIOR ART
A blowing chamber for the suspended guidance of sheets is known from DE-PS 19 07 083, in which blower openings with a downward extending guide surface are provided. The sheet is guided to an air cushion by air jets emerging from these blower openings. It is disadvantageous here that this device cannot be charged with suction air and that no directed jet can be generated by means of these nozzles.
DE-PS 34 11 029 describes a continuous guide surface with air nozzles embodied as bores. The air nozzles can be selectively operated as blower or suction nozzles. It is disadvantageous in connection with these nozzles that no suction effect is generated during the blowing operation and no directed force for stretching the sheet can be generated.
Neither of the two embodiments in the prior art have a device which clamps a sheet at its top by means of a second air cushion and by means of which drying of the sheet can take place.
DE-PS 34 43 704 discloses a conveying device for sheets which has two guide surfaces arranged one on top of the other. These guide surfaces are provided with bores which are used as air nozzles. The sheet is clamped between two air cushions. It is disadvantageous in this case that the sheet floats between these air cushions in an undefined position and tends to flutter easily.
These air nozzles are served by a large number of blowers, which requires a large control and installation outlay.
DE-PS 14 49 656 describes a device for the flutter-free guidance of flat materials. Here, blowing chambers provided with slit nozzles are provided for guiding the flat materials, opposite of which blowing chambers with perpendicularly emerging blowing jets are arranged for drying.
It is disadvantageous here that no continuous guide surface is provided and therefore the flat materials tend to form waves. Furthermore, the energy outlay for guiding the sheets is high in use with sheets only printed on one side.
SUMMARY OF THE INVENTION
It is the object of the present invention to create a device for guiding freshly coated sheets along a guidancee surface in a processing machine, preferably a rotary printing press, with selectively two modes of operation. In a first mode of operation, "support air and drying operation", an air supply chamber of the guidancee surface and an air supply chamber for impact jet nozzles can be charged with compressed air. In a second mode of operation, "suction air and drying operation", the energy requirements and therefore the operating costs of the device in accordance with the invention can be considerably reduced in comparison with the prior art without greatly affecting drying.
This object is attained in accordance with the invention by providing a device that is used in a processing machine, such as a rotary printing press, to guide sheets over a guidance surface or a first air supply chamber that is provided with slit nozzles. Each slit nozzle has an oblique guide surface extending downward into the guidance surface. A second air supply chamber is located opposite to the first air supply chamber. This second air supply chamber has impact jet nozzles directed toward the guidance surface The device is operable in either of two modes. In a first mode which is a "support air and drying operation" a stable air cushion is formed between the sheets and the guidance surface by charging the first air supply chamber with compressed air. In a second mode of operation, which is a "suction air and drying operation" the first air supply chamber is charged with compressed air so that the slit nozzles act as suction nozzles. The first and second air supply chambers are charged with a common air supply provided by a blower which provides an approximately constant air pressure over changing volume flow and whose power consumption is approximately equal to the conveyed amount.
The advantages which can be a
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patent: 5634636 (1997-06-01), Jackson et al.
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Burr Edgar
Koenig & Bauer--Albert Aktiengesellschaft
Nguyen Anthony H.
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