Abstract: A method of compensating for resistance tolerances in the printing of a multi-tone picture with a printing device which includes printing elements. Starting from a smaller number of required tone grades than the number of available tone grades, represented by energy values, printing is always effected with those available tone grades whose available optical density comes close to the required optical density. The differences between the required optical density and actually available optical density are added to form a mean deviation whose magnitude is minimized by selecting the corresponding available tone grade so that the created visual picture has the required optical density.

Abstract: In order to reduce the power requirement of the recording device (1) and thereby to achieve long operating readiness, the recording device (1) is placed in a stand-by state (Z3) during phases when recording is inactive, in which state its control electronics (22) function in power-saving mode. When a charger (3) is connected, the accumulator (2) is charged. The recording device (1) is placed into an operative state (Z4), if the accumulator (4) has a sufficient charge. To further reduce the power requirement, the recording device (1), from the stand-by state (Z3, is separated from the accumulator (2) by opening an electric switch (12), if it has remained in the stand-by state for a certain period of time. The state of charge of the accumulator (2) is monitored, and if it falls below a certain level and the charger (3) is disconnected, the recording device (1) is placed into the electrically shut off state (2), and if the charger (3) is connected, it is placed into the stand-by state (Z3).

Abstract: A process for recording information on a recording substrate, in which a print head with number (a) of printing elements moves back and forth over print positions, one print line at a time. Partial numbers of printing elements form subgroups in accordance with predetermined formations specific to the print lines. These subgroups are allocated to the print positions of a print line and are formed by at least partly differing printing elements. The individual printing elements of the respective subgroup are selectively controlled at the print positions in accordance with print data to produce a print pattern line. On completion of a subsequent print pattern line, the predetermined formation for a subsequent print line conforms, at least on the continuation side, to the predetermined formation of the preceding print line. Stripes caused by line continuation errors or ink ribbon structure errors are distributed throughout the printed image so as to be vertically offset.

Abstract: An improved inking ribbon for color transfer under the influence of heat comprises the ribbon having a carrier layer and a colored layer with the heat-soluble release layer interposed therebetween, which release layer is composed of a sublimable material to avoid renewed adhesion of the released portion of the color layer to the inking ribbon after a color transfer to the printing medium has occured.