Patent ID: 7062214
Filing Date: 2006-06-13
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first stacking unit for stacking regular sheets; an image forming unit for forming an image on a regular sheet fed from the first stacking unit; a second stacking unit for stacking insertion sheets; a delivery unit for discharging the insertion sheets fed from the second stacking unit to a sheet discharge section wherein at least a portion of a path traveled by the regular sheets from said image forming unit to said discharge section and a path traveled by the insertion sheets from said second stacking unit to said discharge section form a common carrier path; a paper thickness detection unit, provided on the common carrier path through which the regular sheets carried from the image forming unit and the insertion sheets delivered from the second stacking unit are transported, for detecting the thickness of the regular sheet and the insertion sheet, wherein said paper thickness detection unit comprises a movable magnetic body and a magnetic field sensor; and a warning unit comprising an operation panel on which a warning is displayed notifying the user of an overlapped feeding condition in accordance with a thickness of each page of a first set and a thickness of each page from a second set onward.