Image recording apparatus

An image recording apparatus, comprising:

• a first motor configured to perform a forward rotation and a reverse rotation;
• a first roller rotatable to produce a rotational driving power, wherein, when the first motor performs the forward rotation, the first roller is rotated in a first rotational direction to produce a first rotational driving power and to convey a sheet in a conveying direction along a conveyance path, and wherein, when the first motor performs the reverse rotation, the first roller is rotated in a second rotational direction reverse to the first rotational direction to produce a second rotational driving power;
• a second motor configured to perform a forward rotation and a reverse rotation;
• a recording portion provided downstream of the first roller in the conveying direction and movable in main scanning directions perpendicular to the conveying direction by the forward rotation and the reverse rotation of the second motor to record an image on the sheet;
• a second roller provided downstream of the recording portion in the conveying direction;
• a first power transmitter configured to transmit the first rotational driving power of the first roller to the second roller to rotate the second roller in a third rotational direction for conveying the sheet in the conveying direction;
• a second power transmitter configured to transmit the second rotational driving power of the first roller to the second roller to rotate the second roller in a fourth rotational direction that is reverse to the third rotational direction;
• a first sensor portion provided upstream of the first roller in the conveying direction and configured to produce a first sense signal when the sheet is conveyed through the first sensor portion;
• a second sensor portion configured to produce a second sense signal when the first roller is rotated;
• a third sensor portion provided between the recording portion and the second roller in the conveying direction and configured to produce a third sense signal when the sheet is conveyed through the third sensor portion;
• a switcher configured to switch whether the rotational driving power of the first roller is transmitted to the second power transmitter;
• and
• a controller configured to control the first motor and the second motor based on at least one of the first sense signal, the second sense signal, and the third sense signal,
• wherein the switcher comprises:
• a first gear movable between a first position and a second position by movement of the recording portion and configured to rotate in conjunction with rotation of the first roller;
• a second gear meshable with the first gear located at the second position, the second gear being configured to transmit the rotational driving power of the first roller to the second power transmitter when the second gear is meshed with the first gear located at the second position;
• and
• a force apply portion configured to apply a force to the first gear in a direction directed from the first position toward the second position, and
• wherein the controller is configured to execute:
• a determination processing in which the controller determines, based on the first sense signal and the second sense signal, whether an upstream edge of the sheet in the conveying direction has reached a third position located between the recording portion and the third sensor portion in the conveying direction;
• and
• a forward and reverse rotation control in which, when the controller determines that the upstream edge of the sheet in the conveying direction has reached the third position in the determination processing, the controller starts driving the second motor to move the first gear from the first position to the second position and thereafter controls the first motor to perform the forward rotation and the reverse rotation alternately a set number of times.