Image-forming apparatus configured to move movable gear to mesh with first gear before receiving print command

An image-forming apparatus comprising:

• a motor configured to rotate forward and in reverse;
• a transfer roller;
• a fixing device including a heat roller and a pressure roller configured to nip a sheet therebetween to fix an image to the sheet, the heat roller and the pressure roller providing a nip pressure therebetween;
• a first cam movable between a first position and a second position, the first cam at the first position bringing the nip pressure into a first nip pressure, the first cam at the second position bringing the nip pressure into a second nip pressure lower than the first nip pressure, the first cam being movable to the first position in response to forward rotation of the motor, the first cam being movable to the second position in response to reverse rotation of the motor;
• a first gear train configured to transmit a drive force of the motor to one of the heat roller and the pressure roller, the first gear train including:
• a first gear;
• and
• a movable gear movable between a transmission position and a non-transmission position, the movable gear at the transmission position being in mesh with the first gear and being configured to transmit the drive force to the first gear, the movable gear at the non-transmission position being separated from the first gear and being configured not to transmit the drive force to the first gear, the movable gear being movable to the transmission position in response to forward rotation of the motor, the movable gear being movable to the non-transmission position in response to reverse rotation of the motor;
• a second gear train configured to transmit the drive force of the motor to the first cam, the second gear train including:
• a switching mechanism configured to switch in state between a transmission state and an interruption state, the switching mechanism at the transmission state being configured to transmit the drive force to the first cam, the switching mechanism at the interruption state being configured not to transmit the drive force to the first cam;
• and
• a controller configured to perform:
• a first process for setting the nip pressure to the first nip pressure by rotating the motor forward and placing the switching mechanism in the transmission state;
• a second process for setting the nip pressure to the second nip pressure by rotating the motor in reverse and placing the switching mechanism in the transmission state;
• and
• a connection process for moving the movable gear from the non-transmission position to the transmission position by rotating the motor forward while the switching mechanism is in the interruption state,
• wherein the controller is configured to wait for a print command in a state where the movable gear is meshed with the first gear by performing the connection process after completing the second process.