Abstract: A fluid spraying head (1) for an ink jet printing device includes a plurality of drop generating elements which are connected to flexible ducts, which in turn are connected to fluid jet nozzles. The fluid jet nozzles are displaceably arranged in respective slots of first and second guiding members (5, 7). The height or size of printing patterns generated by the fluid spraying head onto an object which is moved relative to the fluid spraying head can be varied by changing the relative position of the first and second guiding member (5, 7) with respect to each other.

Abstract: A printing device adapted to print a bar code on a moving information carrier, preferably in the form of a label for marking an article or packaged goods, said bar code consisting of a plurality of parallel bar imprints of different widths separated by spacings lying therebetween. The invention is characterized in that there is provided one single printing member for all of the bar imprints of the bar code, the imprint width of said printing member being not greater than the smallest width of any bar imprint appearing in said bar code, and said printing member being operatively connected to an actuating unit coupled to a programmable control unit, which is adapted to generate control signals at small enough time intervals to form bar imprints of larger width by juxtaposing of bar imprints of the width of said printing member without intervening spacings.