Patent ID: 8167109

Claim:
A medium processing apparatus comprising: a medium conveying mechanism operable to convey a specific sheet medium along a medium conveying path in a medium conveying direction; and an information reading section operable to read information recorded on a recording area of the medium when the recording area of the medium passes through an information reading position on the medium conveying path; wherein the medium conveying mechanism includes: a motor; a driving pulley adapted to be rotated by the motor; an endless belt wound around the driving pulley in a tensile state and adapted to be moved by the driving pulley in a belt moving direction; a first driven pulley around which the endless belt is wound in a tensile state and adapted to be rotated by the endless belt; a first conveying roller disposed on the medium conveying path and adapted to be rotated by the first driven pulley to convey the medium; a first pressure roller disposed to correspond to the first conveying roller so as to press the medium against the first conveying roller; a second driven pulley around which the endless belt is wound in a tensile state and adapted to be rotated by the endless belt; a second conveying roller disposed between the first conveying roller and the information reading position on the medium conveying path and adapted to be rotated by the second driven pulley to convey the medium; a second pressure roller disposed to correspond to the second conveying roller so as to press the medium against the second conveying roller; a third driven pulley around which the endless belt is wound in a tensile state and adapted to be rotated by the endless belt; a third conveying roller disposed on the medium conveying path and adapted to be rotated by the third driven pulley to convey the medium; and a third pressure roller disposed to correspond to the third conveying roller so as to press the medium against the third conveying roller, wherein a distance in the medium conveying path between the information reading position and a nip portion between the first conveying roller and the first pressure roller is set so that the medium is nipped between the first conveying roller and the first pressure roller when the information reading section reads the medium; and wherein the first driven pulley is disposed upstream of the driving pulley in the medium conveying direction; wherein the second driven pulley is disposed upstream of the first driven pulley in the medium conveying direction; wherein the third conveying roller is disposed at a position other than between the first conveying roller and the information reading position on the medium conveying path; and wherein the third pressure roller is disposed at a position other than between the first pressure roller and the information reading position on the medium conveying path, wherein a diameter of the first conveying roller is larger than a diameter of the third conveying roller; and wherein a diameter of the first pressure roller is larger than a diameter of the third pressure roller.