| US 7,478,807 B2 | ||
| Method for conveying a sheet and apparatus for carrying out the method | ||
| Andreas Detloff, Walldorf (Germany); Bernhard Falk, Pfungstadt (Germany); Michael Füner, Karlsruhe (Germany); Peter Hachmann, Dossenheim (Germany); Johann Schunn, Leimen (Germany); and Peter Thoma, Mannheim (Germany) | ||
| Assigned to Heidelberger Druckmaschinen AG, Heidelberg (Germany) | ||
| Filed on Aug. 15, 2006, as Appl. No. 11/504,748. | ||
| Claims priority of application No. 10 2005 044 995 (DE), filed on Sep. 21, 2005. | ||
| Prior Publication US 2007/0063428 A1, Mar. 22, 2007 | ||
| Int. Cl. B65H 31/00 (2006.01) | ||
| U.S. Cl. 271—208 [271/193; 271/204] | 7 Claims |
| 1. A method for conveying a sheet, which comprises the following steps:
providing an apparatus for conveying a sheet, the apparatus including:
a desired path for a pneumatically guided, electrically charged sheet;
a sensor for continuously detecting a charge distribution of an electric field present on the sheet;
at least one actuating element for influencing a position of the sheet;
a control device connected to the sensor and to the at least one actuating element for actuating the at least one actuating
element in dependence on the charge distribution to reduce a deviation in the position of the sheet from the desired path;
a revolving drum having a circumferential contour;
grippers disposed on the revolving drum for holding the sheet;
a sheet guide plate disposed along the circumferential contour of the drum and defining the desired path, the sensor being
structurally combined with the sheet guide plate;
a blown air device forming the at least one actuating element and being disposed along the circumferential contour of the
drum; and
another sensor disposed along the circumferential contour for sensing a floating height of the sheet above the guide plate;
pneumatically guiding the electrically charged sheet along the desired path;
continuously detecting the charge distribution on the sheet; and
reducing the deviation in a position of the sheet from the desired path by actuating the at least one actuating element influencing
the position in dependence on the charge distribution.
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