Double-feed detection apparatus and image forming apparatus

摘要

A double-feed detection apparatus includes a sensor configured to detect double feed of transfer materials conveyed along a conveying path, and a control unit configured to execute detection of the transfer material under conveyance plural times with the sensor, and to determine the double feed of the transfer materials based on detection results. The control unit determines a detection timing based on both a distance along the conveying path from the sensor to an image forming unit which forms an image on the transfer material and a length of the transfer material in the feed direction.

主权项

1. A recording material detection device comprising:
a detection unit configured to detect a plurality of recording materials overlapping one another being conveyed; a first conveyance unit disposed on an upstream side of the detection unit in a conveyance direction of a recording material and configured to convey a recording material; a second conveyance unit disposed on a downstream side of the detection unit in the conveyance direction of the recording material and configured to convey the recording material; a control unit configured to, in a case where a plurality of recording materials overlapping one another being conveyed is detected by the detection unit, control the first conveyance unit so that the plurality of recording materials overlapping one another is stopped before reaching the second conveyance unit; and a determination unit configured to compare a value according to a distance from the detection unit to the second conveyance unit and a value according to a length of the recording material in the conveyance direction and determine detection timing by the detection unit based on a larger one of the values.