Mechanism for preventing feeding of superposed copying paper sheets in an electrostatic copying apparatus.

摘要

A mechanism for preventing feeding of copying paper sheets in the superposed state. Said mechanism comprises a conveying roller (132) having a peripheral surface and mounted for rotation in a predetermined feeding direction; a frictional member (246) and pressing mechanism means for selectively moving said frictional member (246) between an operating state in which it acts on said peripheral surface of said conveying roller (132) and a non-operating state in which it is spaced from said peripheral surface of said conveying roller (132), said pressing mechanism including an oscillating arm (266) supporting said frictional member (246), said oscillating arm (266) being mounted for oscillating movement between a first position at which it maintains said frictional member (246) in said operating state and a second position at which it maintains said frictional member (246) in said non-operating state. Said pressing mechanism means further includes a supporting member (270) mounted on said oscillating arm (266) for movement relative thereto over a predetermined range toward and away from said conveying roller (132). Said frictional member (246) is mounted on said supporting member (270). A pressing spring member means (278) interposed between said oscillating arm (266) and said supporting member (270) for, when said frictional member (246) is in said operating state, elastically maintaining said frictional member (246) in pressing contact with said peripheral surface of said conveying roller (132) <IMAGE>