Overlapped feed detecting device

摘要: Overlapped paper feed can be detected easily and promptly. Along a feeding path, light emitting element 1 receiving sensor 2 are placed face to detection signal corresponding the transmissivity of is output. The not amplified by one system at predetermined amplification ratio via an amplifying circuit 3 in other system. An A/D converter 5a or 5b set each outputs CPU 6 after sampling signal. detects overlapped selecting whose value within effective range which effected noise saturation level.