Heidelberger Druckmaschinen Ag

Andreas Rupprecht

Bernard Beier

Clemens Rensch

Martin Greive

Bernd Vosseler

Uwe Ernst

Gerald Erik Hauptmann

Joachim Sonnenschein

Tobias Mueller

Gerd Junghans

Tobias Müller

Michael Füner

Michael Fuener

Michaela Agari

Ralf Kissel

Uwe Albrecht

Peter Goos

A method for inkjet printing an image onto a curved region of an object surface includes applying a screen of ink drops to the region to create print dots, calculating the screen using a computer and generating and applying ink drops to the region using a print head having nozzles on a nozzle surface. The steps include a) providing data representing the print image, b) providing or calculating data representing the region, c) providing or calculating path data on paths for the print head or object, d) calculating application locations of ink drops using data from steps b) and c), e) calculating data based on tiling the region using data from step d), f) calibrating tone values using data from step e), g) screening the print image using data from step f), and h) printing the screened image onto the region. A device implementing the method is also provided.

Method for inkjet printing on at least one curved region of a surface of an object and device for implementing the method

A device for imaging a flat object, for example a paper sheet in a printing machine, includes a light source, preferably an LED row, a lens and an image sensor. An observation angle between the object plane and lens axis is flat, that is to say less than 45&#xb0;. The light source illuminates the flat object in a first, near region with light of a first wavelength and illuminates the flat object in a second, far region with light of a second wavelength. The first wavelength is shorter than the second wavelength, preferably being blue and red spectral regions. The first region is disposed nearer the image sensor than the second region. The device permits the so-called chromatic aberration of the lens to be utilized to advantageously reduce the tilt angle of the image sensor required by the so-called Scheimpflug condition. A printing machine having the device is also provided.

Device for imaging a flat object and printing material processing machine having the device

A method of creating a fluid layer in the micrometer range includes transferring a fluid between substrates and forming a fluid layer. A surface energy of a first substrate releasing the fluid is higher than a surface energy of a fluid on the first substrate to create a first fluid deposit on the first substrate. A surface energy of a second substrate accepting the fluid is lower than a surface energy of a fluid on the second substrate to create a second fluid deposit on the second substrate that is reduced as compared to the first fluid deposit. A surface energy of a third substrate accepting the fluid is higher than a surface energy of a fluid on the third substrate to create a substantially homogeneous third fluid deposit on the third substrate that forms the fluid layer.

Method of creating a fluid layer in the submicrometer range

An image-recording device for generating image spots () by n individually controllable light sources (), which each have a distance s, i being=1 . . . n, to an object line (), in a projection line () of the object line () on a printing form (), which moves with a velocity component v normally to the direction defined by the projection line () and tangentially to the surface of the printing form. The image-recording device is distinguished by the triggering device () having an assigned time-delay device (), which delays the tripping instant of the triggering device for each light source () as a function of the particular distance s. The image-recording device may advantageously by used in direct imaging print units or printing-form exposure units.

Image-recording device for generating a number of image spots in projection line

An inkjet printing system includes a configuration of nozzles, respectively having a nozzle chamber formed with a nozzle opening and provided with a respective piezoelectric element. A control device controls the piezoelectric elements. The control device has at least two signal paths switchable-on individually for each of the nozzles. An inkjet printing process uses at least part of the printing system.

Inkjet printing system and inkjet printing process

A device for conveying printed products through a printing-related machine includes at least one endless conveyor belt running over deflecting rollers and having at least one printed product resting thereon during a conveying operation, and a rotating frictional element provided for driving the conveyor belt, the frictional element being in contact with the conveyor belt on a side thereof whereon the printed product is transported.

Device for conveying printed products through a printing-related machine

Growing community of inventors

Mauer, Germany

Andreas Rupprecht