Papiererkennungsvorrichtung für einen Drucker

摘要

A sheet S, figure 2(b), approaching the detection device in its rest position, figure 2(a), pivots auxiliary lever 22 anticlockwise about shaft 25 until lever arm 23 abuts part 20 of main lever 12, the levers 22 and 12 then pivoting together anticlockwise to the figure 2(b) position to permit passage of the sheet. Lever 12 includes an apertured shield 15 to trip a photoelectric sensor 28. The levers are returned to the rest position by weights 23 and 14. Reverse feed of a sheet pivots lever 22, but not lever 12, clockwise from the rest position.