Patent ID: 8348533
Filing Date: 2013-01-08
Classification: B41J

Abstract:
1. A printer comprising: a print head; a platen having one end to which a platen-side gear is secured; a driving motor; a rotational driving mechanism for transmitting the rotational driving force of the driving motor to the platen-side gear; and a printer frame having a support groove having an opening through which the platen is inserted/detached, wherein the rotational driving mechanism contains a sun gear, and a pair of planetary gears that move around the sun gear while engaged with the sun gear and are engaged with a platen-side gear, and the support groove, the platen-side gear and the rotational driving mechanism are arranged so that when one of the planetary gears is engaged with the platen-side gear, the planetary gear concerned is engaged with the platen-side gear at such a position as to prevent the platen supported in the support groove from moving toward the opening of the support groove, and when the other planetary gear is engaged with the platen-side gear, the rotational driving force to be transmitted to the platen-side gear acts on the platen-side gear so as to prevent the platen supported in the support groove from moving toward the opening of the support groove.