Sheet transport device

摘要

A sheet transport device includes a sheet supporting surface which receives a plurality of sheets set thereon, a separation roller which separates the sheets set on the sheet supporting surface sheet by sheet to transport a separated sheet in a predetermined transport direction, and a first detection unit which is disposed to the supporting surface and detects whether a sheet is set on the sheet supporting surface. The separation roller and the first detection unit are disposed to be separated at least in a sheet width direction orthogonal to the predetermined transport direction, and a distance between the first detection unit and an end edge of the separation roller at a side of the first detection unit is longer than a short side of a non-allowable sheet which is smaller than a minimum sheet size within an allowable transport range set in the sheet transport device.

主权项

1. A sheet transport device comprising:
a sheet supporting surface configured to support one or more sheets thereon; a separation roller configured to separate, one by one, the one or more sheets supported by the sheet supporting surface to transport a separated sheet in a predetermined transport direction; a first detection unit disposed by the sheet supporting surface and configured to detect whether a sheet is set on the sheet supporting surface; a second detection unit disposed at a downstream side of the separation roller in the transport direction and at an opposite side of the first detection unit in a sheet width direction with respect to the separation roller, and configured to detect a sheet which is transported toward a downstream side in the transport direction from the separation roller; a cover configured to be displaceable between a closed position and an opened position; and a transport roller disposed at a downstream side of the separation roller in the transport direction, and configured to transport a sheet separated by the separation roller in the transport direction, wherein the sheet supporting surface comprises a movable sheet guide configured to regulate a position of a sheet in the sheet width direction orthogonal to the predetermined transport direction, the movable sheet guide comprising two sheet guide members, and a distance between the sheet guide members being changeable between a first distance where the sheet guide members are closest to each other and a second distance which is larger than the first distance, wherein the first detection unit is disposed on an extension line of a guide surface of one of the sheet guide members in a state where the distance between the sheet guide members is the first distance, wherein the transport roller configures a curved path to transport the separated sheet further downstream while turning in the transport direction, wherein the second detection unit is disposed at a downstream side of the curved path, and wherein when the cover is at the opened position, the curved path which is at an upstream side of the second detection unit is uncovered.