IMAGE READING DEVICE AND IMAGE FORMATION SYSTEM

To accurately set an interval between an opposite roller and a transparent member.SOLUTION: An image reading device comprises: a reading glass 704 that forms part of a conveyance path; a CIS 702 that at a reading position, reads a sheet via the reading glass 704; a backing roller 706 that is provided at the reading position so as to be opposite to the reading glass 704 and makes the sheet pass between the backing roller and the reading glass 704; and an adjustment mechanism 6 that includes an abutment member 707 connected to the backing roller 706 and having an outer peripheral surface sliding on the reading glass 704 and a driving unit for rotating the abutment member 707, where rotation of the abutment member 707 adjusts an interval between the backing roller 706 and the reading glass 704. The abutment member 707 has a movable range 707a smaller than one cycle on the outer peripheral surface. The driving unit rotates the abutment member 707 so that the outer peripheral surface slides on the reading glass 704 only in the movable range 707a.SELECTED DRAWING: Figure 16 【課題】対向ローラと透明部材との間隔を高精度に設定する。【解決手段】搬送路の一部を形成する読取ガラス７０４と、読取位置において読取ガラス７０４を介してシートを読み取るＣＩＳ７０２と、読取位置において読取ガラス７０４に対向して設けられ、読取ガラス７０４との間にシートを通過させるバッキングローラ７０６と、バッキングローラ７０６に連結され、読取ガラス７０４に摺動する外周面を有する突き当て部材７０７と、突き当て部材７０７を回転させる駆動部と、を有し、突き当て部材７０７が回転することによりバッキングローラ７０６と読取ガラス７０４との間隔を調整する調整機構６と、を備える。突き当て部材７０７は、外周面において１周未満の可動範囲７０７ａを有し、駆動部は、外周面が可動範囲７０７ａでのみ読取ガラス７０４に摺動するように突き当て部材７０７を回転させる。【選択図】図１６