Arrangement for driving a printing head along a printing line

摘要

An arrangement for driving the printing head along a printing line of a recording medium comprises a reversible direct-current electric motor which is coupled to the head for moving the latter forwards and backwards along the printing line. The head prints only during the forwards movement and during this movement the motor is supplied with a first voltage which causes the forwards movement of the head at a first substantially constant velocity. After the printing of a last character the head is moved away from the recording medium by an electromagnet and the motor is supplied with a second voltage which causes the backwards movement of the head at a second substantially constant velocity, greater than the first velocity. During the backwards movement of the head two rollers advance the recording medium and held it tensioned in correspondence with the printing line.