Sheet feeding or delivering – Delivering – By pneumatic conveyor
Patent
1996-09-03
1999-02-09
Bollinger, David H.
Sheet feeding or delivering
Delivering
By pneumatic conveyor
B65H 2924
Patent
active
058683860
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a blowing chamber for the suspended guidance of sheets or webs in processing machines, in particular rotary printing presses.
DESCRIPTION OF THE PRIOR ART
DE-PS 19 07 083 describes a blowing chamber with several blower openings disposed in a distributed manner, which openings respectively have an oblique guide surface extending downward into the blowing chamber. However, in this case, the nozzles have a tongue and the radial guide surfaces enclose an angle between 120.degree. and 180.degree.. By means of this, a widely fanned out jet with a flat effect is generated, not a directed jet. Also, all blowing nozzles are disposed in the same direction. By means of this, it is possible to exert a barely tightening force in only one direction, which is particularly disadvantageous with thin sheets, because they easily tend to flutter because of this.
DE-PS 28 02 610 discloses nozzles, the lateral surfaces of whose oblique guide surfaces extend parallel and are provided with a lowered tongue. These nozzles are disposed closely together next to each other on blowing chambers. A guide path is described, which consists of several blowing chambers which are disposed above and below of sheets to be guided. No closed guide surface results from this. The air flows off through gaps created between the individual blowing chambers, so that no even air cushion is created and the sheets are guided along the guide path in a wave shape. It is disadvantageous in connection with the described nozzles that the emerging air jets do no diverge, so that a large number of nozzles are required for building a homogeneous air cushion.
A blowing chamber in accordance with the species for the suspended guidance of sheets or webs in processing machines is known from DE 89 15 626 U1. Here, the nozzle bodies of the blowing chamber have a nozzle opening, which is followed by a guidance surface. Blowing jets emerging from the nozzle opening are guided along this guidance surface.
It is disadvantageous here that only blowing jets with undefined opening angles of more than 100.degree. are created.
SUMMARY OF THE INVENTION
It is the object of the present invention to create a blowing chamber for the suspended guidance of sheets or webs which has a guidance surface provided with nozzles but otherwise closed off, by means of which an evenly supporting air cushion, i.e. without gaps or oppositely acting blowing jets, can be provided between the blowing chamber and the sheets or webs, and whose nozzles generate a directed, laterally bounded blowing jet.
This object is attained in accordance with the invention by means of a device that forms a blowing chamber for the suspended guidance of sheets or webs in a processing machine, such as a rotary printing press. The blowing chamber has a guidance surface which has nozzles but which is otherwise closed. This surface, and its nozzles, face the sheets or webs. The nozzles have blower openings and adjoining guide surfaces which extend obliquely into the interior of the blowing chamber. These guide surfaces end in a circular arc-shaped transition at the guidance surface. The blower openings are rectangular in configuration and the guide surfaces define an opening angle between the blower openings and the arc-shaped transition of between 20.degree. and 50.degree..
It is achieved by means of a blowing chamber in accordance with the invention and the arrangement of the nozzles that a particularly even air cushion is formed over an entire guidance surface. By means of this air cushion, a sheet or a web is simultaneously supported and aspirated because of the effect of the aerodynamic paradox. In spite of this even air cushion, in which the suction and pressure forces are in an equilibrium, directed, slightly diverging flows of the nozzles exert forces for tightening in defined directions. In an advantageous manner these forces are directed to free edges of the sheet.
A division of the guidance surface into three zones across its width, central stabiliz
REFERENCES:
patent: 3633281 (1972-01-01), Vits
patent: 3957187 (1976-05-01), Puigrodon
patent: 4218001 (1980-08-01), Vits
patent: 4432221 (1984-02-01), Barton
patent: 4632321 (1986-12-01), Danler
patent: 5102118 (1992-04-01), Vits
Schwitzky Volkmar Rolf
Stiel Jurgen Alfred
Bollinger David H.
Koenig & Bauer Aktiengesellschaft
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