Patent ID: 7957687
Filing Date: 2011-06-07
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a sheet stacking section that holds sheets on which an image is to be formed; a detecting unit that detects a conveyed sheet; and a control section that receives information related to the size of a sheet stacked on the sheet stacking section and sets a first detecting timing after time based on the information related to the size elapses subsequent to detecting a front edge of the conveyed sheet stacked on the sheet stacking section, wherein if the detecting unit has not detected a rear edge of a first sheet at the first detecting timing, said control section sets a second detecting timing by adding a first conveyance malfunction detecting time to detect a conveyance malfunction of the first sheet subsequent to the first detecting timing if a second sheet has started to be conveyed, and by adding a second conveyance malfunction detecting time longer than the first conveyance malfunction detecting time subsequent to the first detecting timing if the second sheet has not started to be conveyed.