Eastman-kodak Company

Stefan Schluenss

Eckhard Bauer

Stefan Schrader

Jan Dirk Boness

Dimitrios Kostudis

Soenke Christian Bluethgen

Ingo Neuber

Eberhard Voss

Robert Hoyer

Jens Ellerbrock

The invention relates to a method for controlling the transport of sheets through a printing apparatus, in particular a digital printing apparatus. In the method for controlling the transport of sheets through a printing apparatus, a print queue is set by assigning images to respective sheets, prior to feeding the respective sheets into the transport arrangement. The sheets are then fed into the transport arrangement, and it is detecting whether a double sheet feeding has occurred. Superposed double sheets are deflected to a double sheet box, which is arranged upstream of the at least one print module, and at least those sheets following the superposed double sheet in the transport arrangement, for which an image has already been assigned and which are not in a duplex path, are guided to a waste box, which is arranged downstream of the at least one print module. Finally, the print queue is automatically reset and printing is continued without stopping the printing apparatus.

Method for controlling the transport of sheets through a printing apparatus

A lifting unit and a process for lifting a stack of sheets having at least a first support () and at least a second support () are described. The first support defines a first con-toured or flat support surface, and the second support defines a second support surface which has a substantially horizontal, flat main surface. In the lifting unit at least one unit is provided for lifting the first and second supports. During operation the supports are lifted such that at least a highest point of the first support is kept elevationally above the second support, the second support is lifted more quickly than the first support, and the substantially horizontal, flat main surface of the second support is kept in its horizontal alignment. The lifting unit is described, in combination with a sheet feeder.

Sheet feeder having lifting unit

A device and a method for improving the quality of prints using a printing device and system for carrying out a print job with a digital printing machine, preferably with a printing machine that works with a toner, in particular with an electrophotographically operating printing machine, whereby the sheets () are preferably printed by recto-printing and verso-printing, whereby the sheets () to be printed are divided into batches, and whereby, in the case of batches that are incompletely occupied with sheets (), the slots of the missing sheets are replaced by an approximately sheet-sized toner field () on the transport belt () for the sheets.

Duplex electrophotographic printing using sacrificial sheets

The invention relates to a method and a device for transporting a sheet, in particular after a sheet has been picked off a stack and separated therefrom, preferably for the feeder-side use in a printing machine, wherein the sheet is brought to a transport speed, preferably for transfer to another transport path. The object of the invention is to provide a more controlled method of the aforementioned type and a device allowing this method. In accordance with the invention, considering the method, this object is achieved in that the sheet is initially accelerated to a speed that is greater than the desired transport speed and only later, after a phase of this higher speed, said sheet is slowed to the desired transport speed, in which case the phase of the higher speed is dimensioned such that the affected sheet is in a nominal position at the appropriate time.

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Schacht-Audorf, Germany

Stefan Schluenss