Automatic document feeder

An automatic document feeder, comprising:

• a horizontal feeding path having a front end opening positioned at one end of the horizontal feeding path, and an rear end opening positioned at the other end of the horizontal feeding path;
• a curve feeding path, a top end of the curve feeding path slantwise extending downward and frontward from top to bottom, and the top end of the curve feeding path being connected with a common document inlet, a bottom end of the curve feeding path being arched downward and frontward, the bottom end of the curve feeding path being connected with a middle of the horizontal feeding path, a gentle bending corner being formed at a junction area between the curve feeding path and the horizontal feeding path;
• a scanning unit arranged in the horizontal feeding path, the scanning unit being positioned between the gentle bending corner and the rear end opening;
• a movable document guider rotatably positioned near the gentle bending corner for guiding documents from the curve feeding path to the horizontal feeding path, the documents being fed from the common document inlet;
• an actuator rotatably positioned near the gentle bending corner for pushing against the movable document guider;
• a feeding roller arranged in the horizontal feeding path for feeding the documents through the scanning unit;
• a transmission structure connected between the feeding roller and the actuator;
• and
• a motor connected with the transmission structure for outputting a forward torque or a converse torque,
• wherein when the motor outputs the forward torque, the feeding roller accepts the forward torque via the transmission structure to feed the documents through the scanning unit and to eject the documents from the rear end opening;
• wherein when the motor outputs the forward torque, the feeding roller accepts the forward torque via the transmission structure to feed a thick document through the scanning unit, the thick document is fed from the front end opening;
• wherein when the motor outputs the converse torque, the actuator accepts the converse torque via the transmission structure to push against the movable document guider, so the movable document guider is rotated towards an inner side of the gentle bending corner to leave the horizontal feeding path.

An automatic document feeder, comprising:

• a horizontal feeding path having a front end opening positioned at one end of the horizontal feeding path, and an rear end opening positioned at the other end of the horizontal feeding path;
• a curve feeding path, one end of the curve feeding path being connected with a common document inlet, the other end of the curve feeding path being connected with a middle of the horizontal feeding path, a gentle bending corner being formed at a junction area between the curve feeding path and the horizontal feeding path;
• a scanning unit arranged in the horizontal feeding path, the scanning unit being positioned between the gentle bending corner and the rear end opening;
• a motor outputting a forward torque or a converse torque;
• a movable document guider rotatably positioned near the gentle bending corner for guiding documents from the curve feeding path to the horizontal feeding path;
• an actuator rotatably positioned near the gentle bending corner for pushing against the movable document guider;
• a feeding roller arranged in the horizontal feeding path for feeding the documents through the scanning unit;
• and
• a transmission structure connected among the motor, the feeding roller, and the actuator for transmitting the torque,
• wherein when the motor outputs the forward torque, the feeding roller is driven by the transmission structure to transmit the documents to move towards the rear end opening from the common document inlet or the front end opening, when the motor outputs the converse torque, the feeding roller is driven by the transmission structure to transmit the documents to move towards the common document inlet or the front end opening from the rear end opening.