Patent ID: 7703762

Claim:
A sheet supply device comprising: a device main body; a storage cassette that has a stacking portion capable of moving up and down, on which sheets are stacked, the storage cassette being configured to be pulled out of the device main body; a delivery roller that is provided to be movable up and down and is rotated in a state where the delivery roller is brought into contact with a sheet stacked on the stacking portion, so as to deliver the sheet to a downstream side of a conveying direction thereof; a separation roller that is provided at the downstream side of the conveying direction with respect to the delivery roller and is configured to separate the sheets delivered by the delivery roller one at a time; a roller unit that comprises the delivery roller and the separation roller; a gear mechanism that receives a sheet supply start signal to rotate and control the delivery roller; a shaft that connects the delivery roller and the gear mechanism; a cam that is interlocked with the gear mechanism and is rotated by a driving force of the gear mechanism; a moving unit that is brought into contact with the cam and moves the delivery roller from an initial position, where the delivery roller is separated from the stacking portion, and a delivery position; a connecting member that connects the roller unit and the moving unit, a first end portion of the connecting member contacting with the roller unit, a second end portion of the connecting member contacting with the moving unit, the moving unit moving the second end portion downwardly to displace the delivery roller to the initial position, and the moving unit moving the second end portion upwardly to displace the delivery roller to the delivery position; and a delivery-roller forcibly-displacing unit that forcibly displaces the delivery roller from the initial position to the delivery position, when the storage cassette is attached to the device main body.