Patent ID: 7584912
Filing Date: 2009-09-08
Classification: B02C

Abstract:
1. An anti-jam device that restricts the number of paper sheets entering a shredder having a housing whose top surface has a shredder opening and a shredder mechanism that includes a pair of parallel rotary shafts driven by a motor and gearbox and rotating in opposite directions, cutting blades mounted on the rotary shafts to cut the paper into stripes, the anti-jam device comprising: a movable element, which includes a pair of rods disposed between and in parallel with the shredder opening and the rotary shafts; a fixing element, which supports both ends of each rod and has holes that are larger than the diameter of the rod ends; wherein in the auto mode of the shredder, the rods in the movable element are at the bottom of the holes on the fixing element and the minimum gap between the rod restricts the maximum thickness of the paper allowed each time and, in the rev mode, the rods are pushed upwards by the paper to move into an open space in an upper portion of the holes so that the passage width between the rods becomes larger for the paper to be backed out conveniently.