Heidelberger Druckmaschinen Ag | Date: 2016-05-27
A method for avoiding collisions in a digital inkjet printing machine, a method and a device for actuator-based lifting movement of inkjet heads. A sensor/camera monitors the sheets as they travel towards the inkjet heads. In order to avoid collisions, the inkjet heads are raised and lowered again individually and in an oscillation-optimized manner when a defective sheet is detected. The machine does not need to be stopped in the event of defective sheets. Advantageously, rejects can thus be reduced and the performance of the machine can be exploited better.
Heidelberger Druckmaschinen Ag | Date: 2016-08-15
A method for damping pressure peaks in an ink line of an inkjet printer includes connecting the line to a chamber divided by a diaphragm into an air-filled first space and an ink-filled second space, connecting the first space to an air-filled buffer, connecting the buffer to an air pump, a) pumping air into the first space until freeing the chamber of ink and the diaphragm rests on a chamber wall or tension in the diaphragm begins rising substantially linearly, then b) pumping air out of the first space until filling the chamber with ink and the diaphragm rests on a chamber wall or tension of the diaphragm begins rising substantially linearly, while determining the number of pump cycles, then c) pumping air into the first space while passing through substantially half of the determined pump cycles. Steps a and b may be reversed.
Heidelberger Druckmaschinen Ag | Date: 2016-01-27
A device for imaging and/or varnishing the surfaces of objects or vehicles, etc. includes adapting a time lag between an application of fluid and further treatment thereof, such as drying ink or varnish, to a spreading behavior of the fluid during the application thereof. The fluid may be applied to the surface of the object in sections, firstly drying the fluid in individual sections before applying it to the next section.
Heidelberger Druckmaschinen Ag | Date: 2016-06-21
A sheet-transport drum includes at least two sheet-supporting surfaces with suction openings. Each respective sheet-supporting surface is formed of first and second comb segments with segment teeth. Suction grooves are provided in the segment teeth and a trailing-edge suction groove is provided in the sheet-supporting surface of each respective second comb segment. A rotary valve is provided for a timed supply of suction air. A plurality of vacuum sources is provided and a trailing-edge suction groove is assigned to each respective vacuum source by the rotary valve. This ensures that the vacuum provided by a respective trailing-edge suction groove at the trailing edge of a respective sheet is reliably maintained even if a previous or following sheet is missing. A sheet-fed printing machine with the sheet-transport drum is also provided.
Heidelberger Druckmaschinen Ag | Date: 2016-07-21
A method and a device are provided for measuring the contamination of a transparent covering of a plate having LED emitters which are cooled individually or in groups by cooling units. The temperatures of the individual or grouped cooling units are measured and conclusions about contamination are drawn from a comparison of the temperatures with one another. An inkjet printing machine and an offset printing press having the device are also provided.
Heidelberger Druckmaschinen Ag | Date: 2016-06-29
A device for printing on multi-dimensional objects includes an object carrier for holding and moving the object to be printed on, a tool carrier for receiving stationary processing tools, and a frame to which the tool carrier is fixed. The object carrier has three guide tracks which are disposed perpendicular to one another and each of which is oriented along a respective axis of movement. Carriages are movable on the guide tracks for executing a translatory movement of the object relative to the stationary processing tools. The device may have a modular construction, allowing the device to be adapted to a variety of objects to be printed on.
Heidelberger Druckmaschinen Ag | Date: 2016-03-24
A method of correcting measured image data deviations of an image inspection system determining image data using a single measuring head and image measuring unit, by using a computer, includes measuring color spectrums of color fields using the head and unit, creating a color set from color spectrums of the head and unit, calculating spectrums from overprinting color combinations for the head and unit using a color model and the respective color set, calculating Lab color values for the head and unit based on spectrums of the head and unit, determining deviations between color values of the head and unit for supporting points, adding determined deviations to the color values of the measuring unit at the supporting points, creating an ICC profile based on corrected color values of the measuring unit for converting imprecise measured values thereof into accurate color values, and correcting imprecisely measured values of the measuring unit using the profile.
Heidelberger Druckmaschinen Ag | Date: 2016-07-18
A buckle folding unit for sheets includes a buckle plate, three rollers that form a transport roller pair and a folding roller pair, and a blown-air nozzle for guiding the sheets. The at least one blown-air nozzle emits a blown-air jet in a direction radial to a common roller of the transport roller pair and the folding roller pair. The air jet places the sheet against the surface of the common roller and guides it into a nip of the folding roller pair in a defined way, advantageously resulting in an improved quality of the fold. A sheet-fed folding machine including a buckle folding unit is also provided.
Heidelberger Druckmaschinen Ag | Date: 2016-04-20
A printing unit in a sheet-fed printing machine includes a printing cylinder, an upstream transfer cylinder and a downstream transfer cylinder. The transfer cylinders each include a device for decelerating/accelerating a sheet. The device, in particular, includes at least one gripper bar being movable in a substantially radial direction to change the tangential speed of the gripper bar and thus of the sheet. A printing unit of this construction allows the sheets to be transported at a lower speed and at a shorter distance from one another during the printing process, resulting in a better print quality and a higher throughput of the machine. A sheet-fed printing machine including such a printing unit is also provided.
Heidelberger Druckmaschinen Ag | Date: 2016-04-11
A device for inserting a web of printing material into a flat-bed die-cutting and/or embossing machine includes a compensator for converting a continuous movement of the web of printing material into an iterative movement of the web of printing material. A clamping unit clamps the web of printing material, a cutting unit carries out a cross cut through the web of printing material, and an inserting unit transports the web of printing material into the flat-bed die-cutting and/or embossing machine. The device advantageously allows the web of printing material to be automatically clamped, cut and fed to the flat-bed die-cutting and/or embossing machine. As a result, no further stopping of an upstream printing press is required and the amount of waste is reduced. A manufacturing system for producing packages and a method for feeding a web of printing material are also provided.