Paper Shredder

Overview

A paper shredder destroys documents by drawing them into a pair of intermeshing cutter shafts that slice the paper into narrow strips or small particles. Security is rated to the DIN 66399 scale; this cross-cut machine reaches P-4, cutting each sheet into roughly 4 by 40 mm confetti that cannot practically be reassembled, making it suitable for confidential office waste. A bin-mounted head design lets the shredded particles drop straight into a removable basket.

The unit is a shredder head seated on a waste bin. The Shredder Head houses the working parts: the Cutting Assembly of twin hardened-steel cutter shafts, the Drive Motor that drives them, and the Reduction Gearbox that reduces the motor's speed into the high torque the cut demands. Paper enters through the Feed Throat with its safety flap, controlled by the Control Board. Particles collect in the Waste Bin below.

How it works

When paper is inserted into the Feed Throat, an optical or capacitive sensor detects it and signals the Control Board to start the Drive Motor. The motor spins fast but with little torque, so the Reduction Gearbox gears it down, multiplying torque to overcome the resistance of cutting many sheets at once.

In the Cutting Assembly, two parallel shafts carry interleaved toothed cutting wheels that rotate toward each other. The teeth grip the sheet and pull it down between the shafts, slicing it into long strips; on this cross-cut design a second set of cutters or stripper fingers chops those strips transversely into short particles. When the paper clears, the sensor drops and the motor stops automatically. If the throat is overloaded the controller detects the motor stalling and reverses the shafts to clear the jam. A guard around the throat and a switch that cuts power when the head is lifted off the bin keep fingers away from the cutters.