Portable scanner

A portable scanner adapted for scanning a document having a binding edge or the document without the binding edge, the portable scanner comprising:

• a housing;
• a transmitting path horizontally and longitudinally penetrating through two opposite sides of the housing, one side of the transmitting path forming a first channel passing through one side surface of the housing, and the other side of the transmitting path forming a second channel passing through the other side surface of the housing;
• a scanning unit arranged in the transmitting path and partially projecting into the first channel;
• and
• a transmission module arranged in the transmitting path and partially projecting into the first channel, the transmission module being in contact with the scanning unit, the transmission module including a transmission roller, the scanning unit and the transmission roller being disposed to two facing sides of the transmitting path along an up-down direction, the scanning unit being disposed on and contacting with the transmission roller in the first channel of the transmitting path, the scanning unit and the transmission roller being disposed in the first channel and away from the second channel, the transmission roller being driven to rotate in a forward direction or rotate in a reverse direction,
• wherein when the document having the binding edge is scanned by the portable scanner, the transmission roller rotates in the reverse direction, one edge of the document having the binding edge is fed into the transmitting path through the first channel, the one edge of the document having the binding edge is opposite to the binding edge, the transmission roller drives the document having the binding edge to enter the transmitting path until the document having the binding edge is fed to a set distance, after the document having the binding edge is fed to the set distance, the transmission roller stops rotating, and then, the transmission roller rotates in the forward direction to feed the document having the binding edge out of the transmitting path from the first channel, simultaneously, the scanning unit scans the document having the binding edge, and
• wherein when the document without the binding edge is scanned by the portable scanner, the document without the binding edge enters the transmitting path through the second channel, at the time of a front end of the document without the binding edge contacting the transmission roller, the transmission roller drives the document without the binding edge to be fed out of the transmitting path through the first channel, simultaneously, the scanning unit scans the document without the binding edge until a tail end of the document without the binding edge leaving the transmission roller.