Abstract: The invention relates to an arrangement in inkjet printers of the kind in which ink droplets are propelled through a nozzle and onto a recording medium in response to an impulse. The arrangement includes a detachable ink container which includes the nozzle through which ink droplets are propelled, and an ink chamber which is located adjacent to the nozzle. The ink chamber is defined on at least one side by an elastic wall, and adjacent to the elastic wall there is provided a shock-wave generating device. When the device is activated, it moves axially into impact with the elastic wall, such as to generate a shock wave which propagates through the ink chamber and causes an ink droplet to be propelled through the nozzle.

Abstract: A circuit (10) which is intended to control point-generating units (20) of the write head (18) in a printer. To this end, the print circuit (20) constitutes an interface between a central unit (12), an external direct access memory (RAM; 14) and a driver stage (16) which is intended to activate the write head (18). The circuit (10) also includes a control module (26), a pixel buffer module (28) and a rotation module (32) connected electrically to the direct access memory (14). The control module (26) enables address decoding, internal data buses, a command register and a test logic unit to be controlled. The pixel buffer module (28) holds a buffer memory filled with pixel data, when necessary. The control module (26) and the pixel buffer module (28) are connected to the central unit (12). The rotation module (32) is intended to determine the format of input pixel data for a data flow which is regulated to the point geometry of the write head (18).