Abstract: A circuit board for a printing cartridge, having a number of contact surfaces, wherein two or more of the contact surfaces are arranged in a first row, two or more of the contact surfaces are arranged in a second row, the first row is at a distance from the second row, and the contact surfaces of the second row are designed to apply a higher operating voltage than the contact surfaces of the first row.

Abstract: This invention relates to a device for retrofitting a printer which has a cartridge receiving device for holding interchangeable consumable material cartridges. In order to reduce the cost of production, transport and storage, the device has an insert which has fastening means for attachment in the cartridge receiving device of a printer, on the insert a locking means being made which blocks the fastening means in the fastening position when a consumable material insert cartridge is connected in the cartridge receiving device.

Abstract: This invention relates to an ink cartridge which has at least one ink container which has an ink outlet with an ink outlet opening which extends from the inside to the outside, in the ink outlet opening a differential pressure valve is mounted which includes a valve seat and a valve body which can move relative to it, the valve seat has a continuous valve opening which has a peripheral sealing surface outside, a spring means is attached between the movable valve body and the stationary ink outlet, the valve body is pressed by the spring means with a predetermined closing force to form a seal from the outside against the sealing surface of the valve seat, and can be moved against the closing force to the outside from the sealing surface. In order to form an ink cartridge with a differential pressure valve which works more reliably, the invention proposes that the valve seat be made deformable so that the sealing surface can be moved relative to the ink outlet opening.

Abstract: This invention relates to a process for cleaning an inkjet printing head which has nozzle openings and ink channels which lead to them, in which electrical drive elements for ejecting ink out of the nozzle openings are located, in which the nozzle openings and the ink channels are forcibly flushed with cleaning liquid. To achieve improved cleaning action more gently and less expensively, the drive elements are triggered in an oscillating manner during the forced flushing with cleaning liquid. A cleaning device for carrying out this process is also disclosed.

Abstract: The present invention pertains to an ink supply tank for an inkjet print head that can be installed in fixed fashion in an inkjet printer, having an ink reservoir that can be connected to an ink supply line leading to an inkjet print head, and having an ink delivery device that has actuating elements accessible from the outside, which can be brought into active engagement with corresponding, motor-powered drive elements of the inkjet printer, in which the ink delivery device feeds ink into the ink supply line at overpressure upon actuation of the actuating elements. In order to reduce the manufacturing effort and ensure a high level of functional reliability with an ink supply tank of such a type, the invention suggests that the ink delivery device have a pressure-generating device that acts on the ink reservoir and is coupled with the actuating elements, and that provides the ink reservoir with overpressure when the actuating elements are driven.