Heat printing device

A thermal print device comprising a plane support (1) of rectangular shape that is fitted on one of its faces, parallel to one of its longitudinally-extending edges (1a), with a resistive line (17) extending over conductor segments (14, 15) disposed perpendicularly thereto and extending alternately to one side and to the other side of the resistive line (17), one (14) of the series of segments coming from a common conductor, the device being characterized in that the common conductor is constituted by a conductive layer covering the support, and in that the resistive line (17) and the conductor segments (14, 15) across which it extends are formed on an insulating layer (7) covering the conductive layer (3), the insulating layer (7) leaving an uncovered strip (8) of the conductive layer (3) adjacent to one of the edges (1a) of the support, forming the zone in which one of the series (14) of conductor segments is provided and extending between said edge (1a) of the support (1) and the resistive line (17), the conductive layers (3) being cut out to form crennelations in the vicinity of the other longitudinally-extending edge (1b) of the support to form areas (9, 10, 11, 12) enabling it to be connected to a power supply, which areas are likewise left uncovered by the insulating layer (7).