Patent ID: 8439286
Filing Date: 2013-05-14
Classification: B02C

Abstract:
1. A paper clearing device for a shredder, comprising: a frame, a motor, a gear set, and a first rotary shaft and second rotary shaft disposed in parallel and driven by the gear set; the motor, the gear set, the first rotary shaft, and the second rotary shaft being installed on the frame; the first rotary shaft and the second rotary shaft each having mounted thereon a plurality of cutting blades and paper guides; a paper inlet being formed above the cutting region between the oppositely rotating cutting blades; and a shredded paper outgoing passage being formed below the cutting region; wherein at least one of the paper guides of the first rotary shaft include a paper back guide that extends above a top of the cutting blades for preventing paper from passing over the cutting blades in a direction away from the paper inlet when the cutting blades are rotated in a reverse direction; wherein each of the paper guides of the second rotary shaft is a half paper guide that lacks said paper back guide for preventing paper from passing over the cutting blades, each said half paper guide having an upper edge that is below a top of said cutting blades to permit paper to pass over the cutting blades in a direction away from the paper inlet when the cutting blades are rotated in a reverse direction; and wherein when a paper backing command is issued due to a paper jam, the cutting blades rotate reversely to bring paper back up to escape from the cutting point of the cutting blades; the reversely rotating cutting blades then causing the paper to pass over the cutting blades toward an outer side of the half paper guides away from the cutting region.