PURPOSE: To simultaneously detect both the return of a carrier to its home position and the drawing of printing paper by a method wherein a single sensor, which is actuated by the tip part of a lever pivoted by an intermediate lever, is provided.

CONSTITUTION: When paper 5 is fully drawn in paper guides 6, the paper 5 comes into contact with the terminal part 2d of a lever 2, resulting in pivoting the lever 2 counterclockwise. Thus, the shading part 2a of the lever 2 shades the detecting part 1d of a sensor 1, resulting in sending ON signal by the sensor 1 so as to perform the detection of the drawing of the paper 5 by the sensor 1. The output signal, which has been under OFF state, of the sensor 1 becomes ON by the arrival of the shading part 2a at the detecting part 1d of the sensor 1 and once OFF by the arrival of a notched part 2b at the detecting part 1d and ON again by the arrival of a shading part 2c at the detecting part 1d and, after that, the resultant ON state is maintained. In this case, the point of time, when the output signal of the sensor 1 is changed-over from OFF in the second time to ON, is detected as the point of time, when a carrier 4 returns to its home position 4a.