MEDIUM CONVEYANCE DEVICE AND IMAGE FORMATION APPARATUS

PROBLEM TO BE SOLVED: To solve a problem in which it is difficult to perform accurate conveyance control including up to a movement position of a medium because the deviation amount of the medium cannot be correctly grasped in a case of detecting the movement amount of the medium by detecting rotation of a co-rotated roller arranged so that the peripheral surface contacts the medium and rotating following movement of the medium and controlling movement drive of the medium.SOLUTION: A medium conveyance device includes: a rotational shaft 81a which rotates by receiving the driving force; division rollers 83-88 which are fixed and arranged on the rotational shaft; a co-rotated roller 89 which is arranged coaxially with the fixed rollers 83-88 and held in a freely rotatable manner by the rotational shaft 81a; a first rotation detection device (80a, 91) which detects the first rotation information of the fixed rollers; and a second rotation detection device (89a, 92) which detects the second rotation information of the co-rotated roller 89.SELECTED DRAWING: Figure 2 【課題】周面を媒体に接触するように配置し、媒体の移動に伴って回転する連れ回りローラの回転を検出して媒体の移動量を検出し、媒体の移動駆動を制御する場合、媒体のずれ量を正確に把握することができず、媒体の移動位置まで含めた正確な搬送制御を行うことが困難であった。【解決手段】 駆動力を受けて回転する回転軸８１ａと、この回転軸に固定配置された分割ローラ８３〜８８と、この固定ローラ８３〜８８と同軸に配置されて、回転軸８１ａによって回転自在に保持された連れ回りローラ８９と、固定ローラの第１の回転情報を検出する第１の回転検出装置（８０ａ，９１）と、連れ回りローラ８９の第２の回転情報を検出する第２の回転検出装置（８９ａ，９２）とを備える。【選択図】図２