Heidelberger Druckmaschinen Ag

Manfred Jurkewitz

Anton Rodi

Dieter Hauck

Alexander Weber

Jürgen Rautert

Günter Bestmann

Joachim Sonnenschein

Michael Lehnert

Christopher Berti

Ulrich Kot

Jürgen Dr Rautert

A quality control method for printed products at a control console includes recording image information of the printed product with a camera device, comparing the recorded data to digital image data of the printed image in a computer, displaying a digital version of the printed product on a screen associated with the control console and illuminating the printed product with at least one light source. The printed product is sensed by using at least one sensor, the position of the printed product relative to the light source and/or relative to the angle of vision of a person is calculated by using a computer, and the displayed digitized version of the printed product is displayed on the screen in accordance with or corresponding to the position of the real printed product.

Quality control method for printed products using 3D digital proofing

A method and an apparatus for compensating for inking differences between setpoint color values and actual color values in offset printing presses having at least one inking unit and a control computer. The control computer controls the printing speed of the offset printing press and the temperature control of rollers in the inking unit of the offset printing press. The control computer is set up in such a way that, if an inking difference is detected between the setpoint color values and the actual color values, a combined control operation including a change in the printing speed and the temperature in the inking unit is performed in order to compensate for the inking difference. A printing press having the apparatus is also provided.

Method and apparatus for compensating for inking differences in printing presses with an anilox short inking unit and printing press having the apparatus

A method and a system for producing a printing form for a printing process on a printing press, produces a first printing form based on first image data and prints a printing image on a printing substrate with the printing form. Printing presses without inking zones do not permit regulation of quantitative ink supply with inking zones screws. To permit a printer to manipulate ink density on a printing substrate even after exposure of a first printing plate within a printing press without inking zones, correction values are generated in the vicinity of the printing press in regions on the basis of at least a printing image printed on the printing substrate. The correction values are then used for correcting printing originals on which printing is based and/or screened image data and at least one second printing form is produced on the basis of at least the correction values.

Method and system for producing printing forms for anilox printing presses

A method for regulating web tension in a web-fed rotary offset printing press includes increasing web tension over a predetermined speed range, substantially linearly with web speed, as the printing press runs up to operating speed, and an apparatus for performing the foregoing method.

Method and apparatus for regulating web tension in a web-fed rotary

Method of monitoring the transport of print products in a printing-field machine includes, in a first step, forming, in a control device, monitoring zones for leading and trailing edges of a print product, for a zone free of a print product and for a print-product zone, by initially determining the positions of the leading and trailing edges over a defined number of print products and storing them in the control device; by, furthermore, checking the mean values, determined on the basis of measured position values of the leading and trailing edges, as to whether the mean values exceed a given tolerance range; if the tolerance range is exceeded and if a detection system does not produce a signal after the transport device has moved somewhat, re-determining the positions of the leading and trailing edges over a further defined number of print products and storing them in the control device until the mean values are within the tolerance range and, thereafter, defining the monitoring zones in which the signal generated by the detection system for the respective zones may be present; in a second step, determining the actual positions of the edges of all further print products and checking as to whether the respective edges are within the given monitoring zone for the respective edge, and as to whether the print product is within the print-product zone, as to whether the print product is really not within the print-product-free zone, and quickly stopping the machine if the outcome of the check is negative.

Method of monitoring the transport of print products in a printing-field

A position determining device for an adjustment device including two continuous potentiometers having sliders movable to respective positions determininng respective resistance values of the potentiometers, the sliders being coupled with the adjustment drive so that the respective resistance values determined by the positions of the sliders correspond to a set position of the adjustment drive, a device for driving each of the sliders with a transmission ratio different from one another so that the potentiometers have a resistance value different from one another for a given set position of the adjustment drive, and a device for establishing a differential value from the different resistance values as a measure of the set position of the adjustment drive.

Position determining device

Control board for a quality system for a printing press

A device for controlling a machine having controls for inputting commands, and display elements for displaying a status includes at least two groups of the controls including a first group of controls for selecting an assignment of a second group of controls to given machine components to be controlled, the display elements serving to display the assignment.

Growing community of inventors

Wiesloch, Germany

Manfred Jurkewitz