Patent ID: 7547017

Claim:
A sheet feed device, comprising: a sheet feed tray on which a sheet is placed; a sheet feed unit which feeds a sheet placed on the sheet feed tray; a detection sensor unit which detects the presence/absence of a sheet on the sheet feed tray, wherein the detection sensor unit integrally includes a light-emitting element which emits light to a sheet and a light-receiving element which receives light reflected on a sheet; and a sensor mounting member to mount the detection sensor unit, wherein the sensor mounting member has an angle changing mechanism which can adjust an angle of the detection sensor unit in a direction perpendicular to a sheet feed direction and a sheet mount surface of the sheet feed tray, wherein the angle changing mechanism can change the position of the detection sensor unit to a reference position substantially parallel to the sheet mount surface of the sheet feed tray and a tilt position at a predetermined angle on one side with respect to the sheet mount surface of the sheet feed tray in either of directions perpendicular to the sheet feed direction, and wherein a fixing direction of the sensor mounting member to the sheet feed tray is changeable by 180 degrees and the predetermined angle of the detection sensor unit to the sheet mount surface changes to an opposite side by changing the fixing direction of the sensor mounting member to the sheet feed tray by 180 degrees.