Patent ID: 8632071

Claim:
A jam detecting apparatus, comprising: a first detection unit that, when a plurality of recording materials are continuously conveyed, detects an interval between a trailing edge of a preceding conveyed recording material and a leading edge of a next subsequently conveyed recording material; a second detection unit that is disposed on a downstream side in a conveyance direction of the recording material relative to the first detection unit, and is configured to detect a shorter interval than that the first detection unit can detect; a setting unit that, after the leading edge of the subsequently conveyed recording material has been detected by the second detection unit, sets information indicating generation of a jam of the subsequently conveyed recording material; and a control unit that determines whether or not a jam has been generated based on the information set by the setting unit when the interval has not been detected by the first detection unit and the interval has been detected by the second detection unit, and thereafter the subsequently conveyed recording material is no longer detected by the second detection unit.