Abstract: The invention is a print head for a thermal printer having a print region, a plurality of heating elements arranged in the print region, and actuating electronics by which the heating elements can be actuated. One or more additional heating elements are arranged outside the print region, wherein at least one of the additional heating elements has a property, that differs from a normal property, of the heating elements arranged in the print region. There is included a method for production of the print head. The device electronics further comprises a testing circuit for verification of the print head, in which the print head has one or more additional heating elements whose properties differ in regard to at least one normal property of the heating elements and the testing circuit for verification of the print head is designed to check this property at least on some of the heating elements.

Abstract: A printing device for imprinting selected characters from a plurality of type wheels on a record medium is described. Control means are provided for selectively adjusting each of the type wheels to bring selected characters of each of said type wheels into registry with printing positions on the record medium. The control means includes adjusting means for each of said type wheels which are conjointly driven by a common drive means. Means are provided for inhibiting the operation of selected adjusting means when the associated type wheels have reached the selected printing position. Elastic coupling means are provided between the drive means and each adjusting means to permit the continued movement of said drive means independently of an inhibited condition of one or more of said adjusting means. Means are further provided for storing information to program the operation of the control means.

Abstract: A printing device for imprinting selected characters from a plurality of type wheels on a record medium is described. Control means are provided for selectively adjusting each of the type wheels to bring selected characters of each of said type wheels into registry with printing positions on the record medium. The control means includes adjusting or typesetting means for each of said type wheels which are conjointly driven by a common drive means. Means are provided for selectively disengaging the drive means and the adjusting means of any type wheels which have selected characters in registry with the printing position on said record medium. The drive means continues to drive other adjusting means notwithstanding the prior disengagement of other adjusting means from the drive means.