Patent ID: 8730532

Claim:
An automatic document feeding scanning device, capable of scanning a document, wherein the automatic document feeding scanning device comprises: an automatic document feeder, capable of feeding the document, wherein the automatic document feeder has a feeding gear; a flatbed scanner, disposed under the automatic document feeder, and capable of scanning the document, wherein the flatbed scanner has a scanning gear; and a power switching mechanism, disposed at a position near the automatic document feeder and the flatbed scanner, and capable of transmitting a first driving power to the automatic document feeder or transmitting the first driving power to the flatbed scanner, wherein the power switching mechanism comprises: a first driving module, capable of providing the first driving power and outputting the first driving power, wherein the first driving module comprises a first driving element capable of rotating and thus providing the first driving power; a planet gear module, connecting with the first driving module, and capable of engaging with the feeding gear and thus transmitting the first driving power to the automatic document feeder, or engaging with the scanning gear and thus transmitting the first driving power to the flatbed scanner; a swinging module, near the planet gear module, and capable of assisting the planet gear module in being swung toward the feeding gear or being swung toward the scanning gear when the swinging module contacts with the planet gear module; and a second driving module, connecting with the swinging module, capable of transmitting a second driving power to the swinging module, so as to enable the swinging module to contact with the planet gear module, and the second driving module comprises a second driving element capable of rotating and thus providing the second driving power; wherein the planet gear module is swung toward the scanning gear and engages with the scanning gear when the first driving element rotates along a first rotating direction and the second driving element rotates along the first rotating direction; while the planet gear module is swung toward the feeding gear and engages with the feeding gear when the first driving element rotates along a second rotating direction opposite to the first rotating direction and the second driving element rotates along the first rotating direction.