Sheet-guiding suction box

Details Sheet-guiding suction box Sheet-guiding suction box

1998-10-02

2001-01-23

Ellis, Christopher P. (Department: 3651)

Sheet feeding or delivering

Feeding

With means to align sheet

C271S183000, C271S231000

Reexamination Certificate

active

06176482

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a suction box for guiding sheets. This suction box has a plurality of individually acting suction chambers. A central one of these is smaller than the smallest sheet to be guided and is comprised of two individual chambers.
DESCRIPTION OF THE PRIOR ART
U.S. Pat. No. 2,572,640 describes a suction box for holding films in a central suction chamber, whose extension is less than the smallest format of a film to be held.
It is disadvantageous in connection with this suction chamber that the vacuum collapses in case of a partial coverage, such as occurs in particular in connection with moving sheets, so that the dependable suction of the moved sheet is not assured.
SUMMARY OF THE INVENTION
It is object of the present invention to produce a suction box for guiding sheets.
This object is attained in accordance with the invention by the provision of a suction box that is used to guide a variety of sizes of sheets. The suction box is formed having a plurality of independently acting suction chambers. At least one central suction chamber is arranged so that its extension is less than the smallest size of a sheet to be guided. Two independently acting suction chambers form this central suction chamber.
The suction box in accordance with the present invention can be adapted, in an advantageous manner, to the format of various sized sheets. The effects of secondary air are prevented by this, and an even suction force is achieved, even with formats of different size. With large formats, corners and edges have a greater tendency to flutter. To prevent the fluttering of corners, suction chambers which can be independently controlled are provided there.
It is particularly advantageous to employ this suction box in connection with inspection systems, because it is necessary, in connection with inspection systems, to guide sheets to be inspected steadily and flutter-free at least during the image recording. This is not absolutely necessary in remaining areas of a sheet transport path, so that the increased technical outlay for flutter-free guidance can be avoided.
It is possible by means of an integrated sensor, which is displaceable in the transport direction, to trigger the image recording, in such a way that during the recording the sheet is centered in relation to a CCD area camera of the inspection system.


REFERENCES:
patent: 2572640 (1951-10-01), Lovegrove
patent: 3724940 (1973-04-01), Koizumi
patent: 4173301 (1979-11-01), Turini
patent: 4712009 (1987-12-01), Ohgoda et al.
patent: 4721462 (1988-01-01), Collins, Jr.
patent: 4990793 (1991-02-01), Bonigk
patent: 5329852 (1994-07-01), Bolza-Sch{umlaut over (u)}nemann
patent: 2023547 (1980-01-01), None
patent: 2071063 (1981-09-01), None

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