Scanner

A scanner comprising:

• a base, the base comprising a bottom panel and a sliding portion extending from the bottom panel;
• a sliding slot defined in the sliding portion;
• the sliding slot defining a longer side surface and a first shorter side surface extending from the longer side surface, the longer side surface substantially perpendicular to the first shorter side surface;
• a plurality of first teeth slots defined in the longer side surface and a plurality of second teeth slots defined in the first shorter side surface;
• and
• a scanning module, the scanning module comprising a loading panel substantially perpendicular to the longer side surface and a driving module, the driving module comprising a worm gear assembly engaging the plurality of first teeth slots and capable of moving along the longer side surface in a first direction substantially perpendicular to the loading panel;
• the worm gear assembly adapted to engage the plurality of second teeth slots to prevent the scanning module from moving in the first direction when the scanning module moves to the first shorter side surface along the longer side surface.