Sheet-edge detecting device and image forming apparatus

摘要

A sheet-edge detecting device includes first and second detecting units and a determining unit. The detecting units are disposed at an edge of a sheet having feed holes in a direction crossing a transporting direction of the sheet, and are separated from each other in the transporting direction so as not to be positioned in one or more feed holes simultaneously. In the direction crossing the transporting direction, the detecting units are separated from each so as not to be positioned in a feed hole and outside the edge simultaneously, one of the detecting units is at a position corresponding to an allowable displacement of the edge, and the other detecting unit is at the same position as the one of the detecting units or closer to the edge than the one of the detecting units is. The determining unit determines the position of the edge of the sheet.

主权项

1. A sheet-edge detecting device comprising:
first and second detectors configured to be disposed at an edge of a transported sheet comprising feed holes arranged in a direction of the sheet, wherein the first and second detectors are configured to detect presence or absence of the sheet; and a controller configured to determine a position of the edge of the sheet using detection results obtained by the first and second detectors; wherein the first and second detectors are configured to be separated from each other in the transporting direction of the sheet such that the first and second detectors cannot be simultaneously positioned in one or more of the feed holes, wherein the first and second detectors are configured to be separated from each other in a direction perpendicular to the transporting direction of the sheet such that the first and second detectors cannot be simultaneously positioned in one of the feed holes and outside the edge of the sheet, wherein one of the first and second detectors is configured to be located at a position corresponding to an allowable displacement of the edge of the sheet, and wherein the other one of the first and second detectors is configured to be located closer to the edge of the sheet than the one of the first and second detectors.