Double-side recording apparatus and medium transporting method in double-side recording apparatus

A double-side recording apparatus which inverts a recording medium after the end of the recording of a first face, and then performs the recording of a second face, comprising:

• a recording unit which performs recording on the recording medium;
• a transportation unit which transports the recording medium to a position where the recording unit can perform the recording;
• a movement unit which moves a movable member capable of engaging with the recording unit to an engagement position and a non-engagement position;
• an inversion unit which inverts the recording medium sent from the transportation unit and returns the inverted recording medium to the transportation unit;
• a power source which is common to the transportation unit, the movement unit, and the inversion unit;
• a switching unit which is switched to a connection state capable of transmitting the power of the power source to the movement unit and a disconnection state incapable of transmitting the power;
• and
• a control unit which controls the power source,
• wherein the transportation unit is configured to change a transportation direction according to the normal/reverse driving direction of the power source,
• the inversion unit is configured to be driven in one direction inverting the recording medium in both the normal driving and the reverse driving of the power source, and
• the control unit operates such that, in a case where waiting is done after the recording of the first face was ended and until it comes to the time of the start of the recording of the second face, the position adjustment of the recording medium is performed by driving the power source by an adjustment driving amount in the direction opposite to the driving direction in the movement of the movable member to the engagement position, under the disconnection state of the switching unit, and thereafter, the movable member is moved to the engagement position by driving the power source through the switching of the switching unit to the connection state, and then waits;
• and if it comes to the time of the start of the recording of the second face during the waiting, the movable member is returned to the non-engagement position by driving the power source, and then, under the disconnection state of the switching unit, the power source is driven in the driving direction in which the transportation unit can transport the recording medium to the inversion unit, by a setting driving amount which can reach a driving direction switching position just before the tail end in the inversion direction of the recording medium departs from the transportation unit and the leading end in the inversion direction of the recording medium inverted and returned by the inversion unit reaches the transportation unit, and thereafter the transportation unit is switched from the transportation direction to the inversion unit side, to the transportation direction to the recording unit side, by switching the driving direction of the power source.