18. An electronic printer having a single tracing element for tracing alphanumeric characters, comprising spacing means for relatively moving said tracing element and the paper in a letter spacing relationship, storing means for storing addressable numerical instructions for each one of said characters, addressing means for addressing each time the instructions of a predetermined character, control means conditioned by said addressed instructions, driving means controlled by said control means for driving a pair of electromagnets each having a movable member, and kinematic means supporting said tracing element and connected to said movable members for converting the movements of the said two movable members into the movements of said tracing element along a pair of coordinates, said kinematic means comprising a group of hinged arms, the hinges of which are formed by flexible leaf springs.
18. An electronic printer having a single tracing element for tracing alphanumeric characters, comprising spacing means for relatively moving said tracing element and the paper in a letter spacing relationship, storing means for storing addressable numerical instructions for each one of said characters, addressing means for addressing each time the instructions of a predetermined character, control means conditioned by said addressed instructions, driving means controlled by said control means for driving a pair of electromagnets each having a movable member, and kinematic means supporting said tracing element and connected to said movable members for converting the movements of the said two movable members into the movements of said tracing element along a pair of coordinates, said kinematic means comprising a group of hinged arms, the hinges of which are formed by flexible leaf springs. 33. printer according to claim 18, wherein the said tracing element is carried by a carriage slidable parallel to the direction of printing, said spacing means keeping said carriage locked during the printing of a character and locking said tracing element with respect to the paper in the reached position during letter spacing movement, said spacing means comprising means for releasing the carriage at the end of the said character printing, said instructions conditioning said spacing means to shift said tracing element on said carriage along the printing line an amount equal to the required letter spacing in a direction opposite to that of letter spacing.