Oce Printing Systems Gmbh

Canon Production Printing Holding B.v.

Oce Holding B.v.

Christoph Stadler

Mehrad Biglari

Ender Olgac

Wolfgang Hettler

Christian Maier

Matthias Kage

Felix Wehr

A cover for covering the nozzle plate of a print head while in a parking position to delay a drying of ink. The cover can clean the nozzle plate while the nozzle plate is covered. A cost-effective and installation space-efficient cleaning of the nozzle plate of a print head is thus enabled.

Method and cover for cleaning a print head

In a printing system and a corresponding method, different nozzles of a print head can be activated to eject a nominal ink quantity with different ejection pulses to at least partially compensate for non-uniformities between the different nozzles due to crosstalk. The compensation can reduce system-dependent streaking of the print image.

Inkjet printing system and method to reduce system-dependent streaking

In a method to regenerate during operation ink in nozzles of at least one inkjet print head operating according to drop on demand in an inkjet print apparatus, nozzles of the print head that generate print dots on a printing substrate are activated such that the nozzles output first ink droplets of a predetermined volume in a direction towards the printing substrate. Nozzles that are not being currently used to generate print dots on the printing substrate are activated such that they output at least one second ink droplet of a smaller volume in comparison to the first ink droplets volume. During at least the outputting of the second ink droplet, a suction flow is generated between the inkjet print head and the printing substrate of such strength that the second ink droplet is deflected so it does not arrive at the printing substrate.

Method to refresh the ink in nozzles of an inkjet print head in an inkjet printing apparatus

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Dachau, Germany

Christoph Stadler