Patent ID: 7744081

Claim:
An image forming apparatus, which forms an image on a sheet fed from a sheet feeding device in an image forming portion, the sheet feeding device comprising: a tray which supports sheets; an air blowing portion which blows air to an end portion of the sheets supported by the tray; a conveying portion which sucks and conveys the sheet blown upward with air blown by the air blowing portion; and a sheet surface detecting mechanism, which detects a position of an upper surface of the sheet blown upward, the sheet surface detecting mechanism including: a sensor portion disposed at a position spaced apart from the conveying portion and upstream of the conveying portion in a sheet conveying direction; a sensor flag which turns the sensor portion ON and OFF; a sheet surface detecting member connected to the sensor flag and being disposed to right below the conveying portion, the sheet surface detecting member being extended in parallel with a sucking surface of the conveying portion from a side on which the sensor portion is disposed toward a downstream in the sheet conveying direction, wherein a sheet in contact with any longitudinal position of said sheet surface detecting member will move said sheet surface detecting member in a parallel state with the sheets.