PURPOSE: To always accurately print by a printer by returning a type wheel by type selecting means to a home position at the time of opening or closing a cover member and operating a power switch of a body.

CONSTITUTION: A microswitch 32 is, for example, constructed to press a protrusion element 32a by a rib 3b to close it when a top cover 3 is closed, and rotatably driven by a character selecting motor 13 to return a type wheel 7 to its home position when the cover 3 is opened to open the microswitch 32. Further, the system adds a function to return the wheel 7 to its home position by rotatably driving the motor 12. Thus, even in any case, the wheel 7 can be effectively positioned at the home position.