Sheet transport device, image reading device, and image forming apparatus
A sheet transport device includes a sheet transport path along which at least one sheet is transported to a nip defined by a fixing roller and a displacement roller, a sensing unit disposed on the sheet transport path, an opening and closing member that is movable between a closed position at which the sheet transport path is formed and an open position at which the sheet transport path is exposed, and a guide member that is attached to the opening and closing member and that moves by following displacement of the displacement roller in such a manner as to maintain a certain distance from the sensing unit.
1. A sheet transport device comprising:
a sheet transport path along which at least one sheet is transported to a nip defined by a fixing roller and a displacement roller;
a sensing unit disposed on the sheet transport path;
an opening and closing member that is movable between a closed position at which the sheet transport path is formed and an open position at which the sheet transport path is exposed; and
a guide member that is attached to the opening and closing member and that moves by following displacement of the displacement roller in such a manner as to maintain a certain distance from the sensing unit,
wherein the guide member has a first end portion that is rotatably supported by the opening and closing member and a second end portion that is fitted into a rotary shaft of the displacement roller so as to be movable in a transport direction of the sheet and moves by following displacement of the displacement roller.
2. The sheet transport device according to claim 1 ,
wherein, in the transport direction of the sheet, the first end portion of the guide member is located at a position upstream from the sensing unit, and the second end portion of the guide member is located at a position downstream from the sensing unit in such a manner that the guide member covers the sensing unit.
3. The sheet transport device according to claim 1 ,
wherein the guide member is formed by being separated from a sheet-guide surface of the sheet transport path.
4. The sheet transport device according to claim 1 ,
wherein the sheet transport path includes a curved transport path that is curved, and
wherein the sensing unit is disposed in such a manner as to sandwich the curved transport path.
5. The sheet transport device according to claim 1 ,
wherein the sensing unit is a double-feeding detecting sensor that detects overlapping of a plurality of the sheets.
6. An image reading device comprising:
an imaging unit that reads an image of a document; and
the document transport device according to claim 1 that transports the document to a reading position at which the imaging unit reads the document.
7. An image forming apparatus comprising:
the image reading device according to claim 6 that reads an image of a document; and
an image recording unit that records an image read by the image reading device on a recording medium.