Scanning device having movable scanning module

A scanning device, used for a sheet, the scanning device comprising:

• a tray set, comprising a feeding tray and a first output tray;
• a movable scanning module, disposed movably between a first position and a second position;
• and
• an automatic document feeder, comprising:
• a flip path;
• a feeding path, disposed corresponding to the first position, one end thereof connecting with the feeding tray and another end thereof connecting with the flip path;
• an output path, disposed corresponding to the second position, and one end thereof connecting with the first output tray;
• a returnable path, arranged at a side of the feeding path and comprising an intersection, the intersection connecting with one end of the flip path away from the feeding path and one end of the output path away from the first output tray;
• and
• a feeding wheel group, disposed corresponding to the feeding path, the output path and the returnable path,
• wherein the movable scanning module is configured to scan a first side of the sheet when being located at the first position and is configured to scan a second side of the sheet when being located at the second position;
• wherein the movable scanning module comprises a scanner and a transmission mechanism connected to the scanner and driving the scanner to move between the first position and the second position;
• wherein the movable scanning module and the returnable path are disposed at two sides of the feeding path and the output path opposite to each other, the flip path is a C-shaped path, and the transmission mechanism is a horizontal linear rail or an inclined linear rail.