Abstract:
To avoid possible damaging collisions of a printhead with small receiver defects and other obstacles in a digital printer using a printhead mounted on a scanning shuttle for recording am image on a receiver while scanning along the receiver, a method using the following steps is used: - sensing for possible obstacles having a size smaller and larger than the inkjet head-receiver clearance distance in an area of the receiver to be scanned over by the printhead using a sensor system mounted on the scanning shuttle, - avoiding a collision of the printhead with the obstacle when an obstacle is sensed. Preferably an evaluation step is include to evaluate is a detected obstacle is evaluated to be potentially damaging. A system for using the steps is also disclosed.
Abstract:
Vorrichtung zum Behandeln von Packmitteln (2) durch Aufbringen von Ausstattungsmerkmalen oder Ausstattungen auf die Packmittel (2), mit einer Packmitteltransportstrecke, auf der die Packmittel (2) zum Behandeln in einer Transportrichtung (A) von einem Packmitteleinlauf (1.1) an einen Packmittelauslauf (1.2) bewegt werden, wobei die Packmitteltransportstrecke von wenigstens einem um eine vertikale Maschinenachse umlaufend antreibbaren Transport- und Behandlungselement (7, 7a) mit mehreren Behandlungspositionen gebildet ist.
Abstract:
A print head carriage is disclosed for holding a print head in a printing system. The carriage includes a print head carriage framework (44) having a plurality of print head positioning references (49, 61) for defining a position of the print head (64) onto the print head carriage framework (44), and a cooling channel (70) in thermal contact with the print head carriage framework (44) for controlling the temperature of the print head carriage framework (44) such that the positional stability of the plurality of print head positioning references (49, 61) onto the print head carriage framework (44) is preserved.
Abstract:
An ink system (1) for use in an ink jet printing apparatus includes an inkjet printhead (10), a supply subtank (20) for containing a supply of an ink to the inkjet printhead (10) , and a return subtank (30) for containing a surplus of the ink not used by the inkjet printhead (10). A first fluid path couples the supply subtank (20) with the inkjet printhead (10) and with the return subtank (30), and provides a flow of ink from the supply subtank (20) to the inkjet printhead (10) and to the return subtank (30). A second fluid path couples the return subtank (30) with the supply subtank (20) and feeds the ink from the return subtank (30) back to the supply subtank (20). The ink system is characterised by having the supply subtank (20), the return subtank (30) and the first fluid path supported on a carriage for reciprocating together with the inkjet printhead (10) across the printing medium.
Abstract:
An ink circulation system which improves the degassing quality of the ink supplied an ink jet print head of a printing apparatus is provided. The ink circulation system includes a supply subtank (20) for supplying ink to an ink jet print head (10) and a return subtank (30) returning the ink not ejected by the ink jet print head (10). A print circulation path links the supply subtank (20) with the ink jet print head (10) and the return subtank (30) for providing a print flow of ink from the supply subtank (20) to the ink jet print head (10), the return subtank (30), and back to the supply subtank (20). A degas circulation path links the supply subtank (20) with a through-flow degassing unit (60) for providing a degas flow of ink from the supply subtank (20) to the through-flow degassing unit (60) and back to the supply subtank (20).
Abstract:
The invention provides a method and apparatus for aligning the printing of dots generated by at least one array of printing elements of a printing apparatus. The method includes the steps of printing a calibration test pattern, scanning the printed calibration test pattern, determining at least one calibration value based on the scanned calibration test pattern, and adjusting the alignment of the array of printing elements based on the determined calibration value. The step of scanning the printed calibration test pattern further includes automatically positioning a camera relative to the printed calibration test pattern and imaging a detail of the printed calibration test pattern within the field of view of the camera.
Abstract:
In a digital printer the elements involved directly in the print process, which are located on a shuttle assembly are mounted upon a metrological frame which is isolated from the base frame by vibration dampers. Because the elements of the shuttle drive systems, such as a belt drive system having a motor and pulleys, are mounted upon the base frame, the drive and reaction forces from the motor drive systems are led to the base frame while the shuttles assembly is guided by the force-free, vibration free metrological frame. This allows for higher accuracy during printing as the metrological frame serves as a vibration free reference element.
Abstract:
A printhead positioning system is provided wherein the positioning of the shuttles is done using hybrid motor drive with a high-resolution short stroke motor system mounted on a low-resolution long stroke motor system. By using an embodiment with the combination of a high resolution linear motor of which the stator is mounted on a low resolution long stroke belt drive. High accuracy over a large distance can be attained. This allows for cheaper big size high accuracy positioning systems.
Abstract:
Vorrichtung zum Behandeln von Packmitteln, wie Flaschen, Dosen oder dergleichen Behältern, mit einer vorrichtungsinternen Transportstrecke, auf der die Behandlung der Packmittel an Bearbeitungsstationen (8) in wenigstens zwei Prozessschritten erfolgt, sowie mit Halte- und Zentrierelementen, mit denen die Packmittel (1) zumindest während des jeweiligen Prozessschrittes in einer für diesen Prozessschritt notwendigen Orientierung an dem vorrichtungsinternen Transportsystem gehalten sind und/oder mit denen die Packmittel zumindest während eines Prozessschrittes bewegt werden.
Abstract:
A shuttle air supply system which regulates the air pressure in an inktank (10, 20) of an ink jet printer has a vacuum supply line (11) coupled to a fixed vacuum source, a valve (12, 22) for controlling the opening of the vacuum supply line actuated by a valve control circuit (9) obtaining measurements from a pressure sensor (13, 23) sensing the pressure in the ink tank and wherein the pressure in the inktank is regulated by the valve control circuit to a desired inktank pressure. An pressurized air supply line coupled to a fixed value pressurized air supply and a air pressure valve controlled by the valve control circuit can be added to enhance pressure setting range.