Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1994-01-10
1994-11-08
Eley, Timothy V.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241236, B02C 108, B02C 2302
Patent
active
053620020
ABSTRACT:
A paper shredder includes a box-like casing, a shredding roller assembly provided in the casing, and an automatic paper feeding device. The shredding roller assembly includes a pair of rotatable shredding rollers and a motor driving unit connected to the shredding rollers. The feeding device includes a tray which is mounted to the casing adjacent to the shredding roller assembly, a rotary shaft which is mounted rotatably on the tray, a tension spring which is connected to the rotary shaft and the tray, and at least one push rod, each of which having two pivotally connected rod sections. A first one of the rod sections is mounted on the rotary shaft, while a second one of the rod sections is provided with a press piece which presses against a stack of paper sheets on the tray. The feeding device further includes a pinion which is mounted securely on one end of the rotary shaft, and a wheel which has a sector portion formed with gear teeth and which is driven rotatably by the motor driving unit so as to drive rotatably and intermittently the pinion to rotate correspondingly the rotary shaft against action of the tension spring to cause movement of the press piece and some of the paper sheets toward the shredding roller assembly.
REFERENCES:
patent: 4815669 (1989-03-01), Fujii
patent: 4846413 (1989-07-01), Inoue
patent: 4913360 (1990-04-01), Lane et al.
patent: 4964579 (1990-10-01), Strohmeyer
patent: 5188301 (1993-02-01), Hasegawa
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