Patent ID: 9181055
Filing Date: 2015-11-10
Classification: B65H

Abstract:
1. An image forming apparatus comprising: an apparatus body; a paper feed cassette attachable to and detachable from the apparatus body; a feed section feeding, into the apparatus body, paper stored in the paper feed cassette; an operation control section controlling an operation of feeding the paper by the feed section; a paper passage detection sensor being installed along a conveyance path in the apparatus body, the paper passage detection sensor detecting whether or not the paper has passed through a position corresponding to a position at which the installation is achieved; a cassette attachment-detachment detection sensor detecting attachment or detachment of the paper feed cassette to or from the apparatus body; a paper presence-absence detection sensor detecting presence or absence of the paper in the paper feed cassette, the paper presence-absence detection sensor being configured to detect the paper absence regardless of whether the paper is present or absent when the paper feed cassette is withdrawn from the apparatus body; a sensor failure determination section, when the paper presence-absence detection sensor detects the paper presence in a case where the cassette attachment-detachment detection sensor detects that the paper feed cassette is withdrawn from the apparatus body, determining that the paper presence-absence detection sensor is in failure and setting a failure detection flag; and an alarm control section, in a case where the operation control section has made the feed section execute the feed operation in a state in which the failure detection flag is set, when the paper passage detection sensor does not detect passage of the paper before passage of a predefined time period from a time point at which the execution of the feed operation was started, alarming a user that the feeding of the paper has failed.