Bi-directional paper pickup mechanism

A bi-directional paper pickup mechanism, comprising:

• a pickup roller, an inside of the pickup roller having an inner space penetrating through two opposite ends of the pickup roller;
• an input shaft accommodated in the inner space, one end of the input shaft being received in the inner space;
• a first ratchet element mounted around the other end of the input shaft, the other end of the input shaft and the first ratchet element being received in the inner space, the other end of the input shaft and the first ratchet element being fastened to one end of the pickup roller;
• a second ratchet element mounted around the one end of the input shaft, the second ratchet element being received in the inner space, the one end of the input shaft and the second ratchet element being fastened to the other end of the pickup roller;
• an actuating unit fastened around a middle of the input shaft to synchronously rotate with the input shaft, the actuating unit having a first actuating surface and a second actuating surface;
• a first transmission rotor mounted around the one end of the input shaft, and the first transmission rotor being positioned between the first ratchet element and the first actuating surface, two opposite ends of the first transmission rotor having a first actuating end and a first ratchet end, the first actuating end being disposed adjacent to the first actuating surface, the first ratchet end being disposed adjacent to an inner end surface of the first ratchet element;
• and
• a second transmission rotor mounted around the other end of the input shaft, the second transmission rotor being positioned between the second ratchet element and the second actuating surface, two opposite ends of the second transmission rotor having a second actuating end and a second ratchet end, the second actuating end being disposed adjacent to the second actuating surface, the second ratchet end being disposed adjacent to an inner end surface of the second ratchet element,
• wherein when the input shaft rotates towards a paper feeding direction, the first actuating surface rotates along the first actuating end to push the first transmission rotor to move towards the first ratchet element, the first ratchet end is matched with the first ratchet element, the second actuating end abuts against the second actuating surface, the second transmission rotor breaks away from the second ratchet element, and
• wherein when the input shaft rotates towards a paper receding direction, the first actuating end abuts against the first actuating surface, the first transmission rotor breaks away from the first ratchet element, the second actuating surface rotates along the second actuating end to push the second transmission rotor to move towards the second ratchet element, the second ratchet end is matched with the second ratchet element.

A bi-directional paper pickup mechanism, comprising:

• a pickup roller, an inside of the pickup roller having an inner space penetrating through two opposite ends of the pickup roller;
• a fastening structure disposed in the inner space;
• an input shaft accommodated in the inner space, and one end of the input shaft being pivotally connected to the fastening structure;
• a first ratchet element mounted around the input shaft, the first ratchet element being fastened to one end of the pickup roller, the first ratchet element including a first hollow shaft, the first hollow shaft extending towards the one end of the input shaft;
• a second ratchet element mounted around the one end of the input shaft, and the second ratchet element being fastened to the other end of the pickup roller, the fastening structure being disposed in the other end of the pickup roller;
• an actuating unit fastened around a middle of the input shaft to synchronously rotate with the input shaft, the actuating unit having a first actuating surface and a second actuating surface;
• a first transmission rotor mounted around the one end of the input shaft, and the first transmission rotor being positioned between the first ratchet element and the first actuating surface, two opposite ends of the first transmission rotor having a first actuating end and a first ratchet end, the first actuating end being disposed adjacent to the first actuating surface, the first ratchet end being disposed adjacent to an inner end surface of the first ratchet element, the first transmission rotor having a first shaft hole transversely penetrating through two opposite ends of the first transmission rotor, the first shaft hole extending along an axis direction of the input shaft, the first hollow shaft being pivotally mounted in the first shaft hole;
• and
• a second transmission rotor mounted around the other end of the input shaft, the second transmission rotor being positioned between the second ratchet element and the second actuating surface, two opposite ends of the second transmission rotor having a second actuating end and a second ratchet end, the second actuating end being disposed adjacent to the second actuating surface, the second ratchet end being disposed adjacent to an inner end surface of the second ratchet element, the fastening structure having a second hollow shaft, the second hollow shaft extending along the axis direction of the input shaft, the second transmission rotor having a second shaft hole, the second shaft hole extending along the axis direction of the input shaft, the second shaft hole penetrating through two opposite ends of the second transmission rotor, the second hollow shaft being pivotally mounted in the second shaft hole,
• wherein when the input shaft rotates towards a paper feeding direction, the first transmission rotor rotates towards the paper feeding direction, the first transmission rotor moves towards the first ratchet element, the second transmission rotor breaks away from the second ratchet element, and
• wherein when the input shaft rotates towards a paper receding direction, the input shaft drives the first transmission rotor to rotate towards the paper receding direction, the first transmission rotor breaks away from the first ratchet element, the input shaft drives the second transmission rotor to move towards the second ratchet element, the second transmission rotor is engaged with the second ratchet element.