Thermal printhead mounting control

Writing device with heating elements for printing by thermal action on a writing support, this device being fixed to a base such as a carriage of a printing machine, said device comprising:

• a support for the heating elements bearing, on the one hand, the heating elements arranged in the form of electrical resistors and, on the other hand, first electrical contacts connected electrically to said heating elements,
• an intermediate support mounted on said base and adapted to removably support mechanically the heating elements support,
• a connecting part provided with second electrical contacts arranged to cooperate with abovesaid first electrical contacts of the heating elements support and attached respectively to the base,
• fastening means to fix the intermediate support and the connecting part to the base,
• means for positioning the heating elements support on the intermediate support arranged so that the heating elements occupy, in operating position, a position pre-determined with respect to the writing support and the first and second electrical contacts respectively of the heating elements support and the connecting part cooperate mutually,
• and locking means to make fast mechanically and removably the heating elements support to the intermediate support,
• wherein the fastening means comprise a fixed rotary axle borne by the base and to which are hinged the intermediate support and the connecting part, control means being interposed between the base and the intermediate support to position the intermediate support angularly in a manner suitable for the progress of the writing process.