Document feeder using single motor and image reading apparatus including the same

An image reading apparatus comprising:

• an image sensor to scan documents;
• a document feeder to move loaded documents to a document conveying path onto the image sensor using a single motor,
• the document feeder including a pick-up member to use a driving force of the single motor intermittently through a first clutch to move the loaded documents from a tray to the document conveying path, and
• the document feeder to use the driving force of the single motor intermittently through a second clutch to move the tray loaded with the documents to a side of the pick-up member, and to use sensors to detect the documents in positions spaced on the document conveying path and output signals;
• and
• a processor to control the document feeder and the image sensor to scan the loaded documents, including to control an operation of the first clutch based on the signals of the sensors, wherein:
• a first sensor of the sensors is upstream of the document conveying path with respect to a second sensor of the sensors,
• the processor controls the first clutch to provide no driving force of the motor when the signals of the first and second sensors are in an on state, and
• the processor controls the first clutch to provide the driving force of the motor when the signals of the first and second sensors are in the on state and the signal of the first sensor is changed to an off state.

A document feeder, comprising:

• a tray to include documents to be moved to a document conveying path;
• first and second sensors to detect the documents in spaced positions on the document conveying path, the second sensor being downstream on the document conveying path with respect to the first sensor, the first and second sensors to output signals;
• a pick-up device to receive a driving force from a single motor and move the documents from the tray to the document conveying path one by one when the first sensor is in an off state and the second sensor is in an on state;
• a lifting device to receive the driving force from the single motor and move the tray with the documents to a side of the pick-up device when the signals of the first and second sensors are in the on state and the signal of the first sensor is changed to the off state;
• and
• a feeding device in the document conveying path to receive the driving force from the single motor and convey the moved documents to be scanned.