Patent ID: 7898701

Claim:
An image reading apparatus which has a light source and an image capturing device disposed to face each other with a document table interposed therebetween and holding a document, the image reading apparatus comprising: an image capturing device moving mechanism, comprising a first drive belt operable to perform a moving operation for moving the image capturing device in a scanning direction and a driving source operable to supply a driving force to the first drive belt; a light source moving mechanism, comprising a second drive belt operable to move the light source in the first direction with the movement operation performed by the image capturing device moving mechanism; and an interlocking mechanism, operable to interlock the image capturing device moving mechanism with the light source moving mechanism, the interlocking mechanism operable to supply the driving force of the driving source to the second drive belt through a plurality of gears so that the first drive belt and the second drive belt are interlocked with each other, the interlocking mechanism comprising a first gear and a second gear which engage with each other, the first gear provided with gear teeth protruding toward the second gear, the second gear including ribs forming concave portions engaging with the gear teeth, a portion of each of the ribs which protrudes toward the first gear being formed in a mounting shape so that the gear teeth are guided to the concave portions.