Solid material comminution or disintegration – Apparatus – With automatic control
Reexamination Certificate
1999-04-07
2001-06-26
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
With automatic control
C241S236000
Reexamination Certificate
active
06250574
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a paper shredder, and more particularly to a device for sensing the paper shredding action of the paper shredder.
BACKGROUND OF THE INVENTION
The conventional paper shredder is generally provided at the paper entry thereof with a microswitch or LED electric eye for sensing the entry of paper to be shredded so as to trigger the operation of the motor. As the motor is started, the paper shredding tool of the paper shredder is driven by the motor to execute the paper-shredding operation.
Such a conventional paper shredder as described above is defective in design in that the paper shredding action is brought to a halt before the rear end of the paper is shredded. In order to overcome such a deficiency as described above, the conventional paper shredder is provided with a time delay circuit in conjunction with the microswitch or electric eye to enable the shredding tool to continue operating for additional 2-3 seconds after the rear end of the paper has passed the microswitch or electric eye. However, the addition of the delay circuit to the paper shredder results in an increase in cost of making the paper shredder. Moreover, the electronic components are often susceptible to the environmental factors, such as temperature and humidity, which undermine the longevity and the reliability of the delay circuit.
SUMMARY OF THE INVENTION
It is therefore the primary objective of the present invention to provide a paper shredder with a simple and efficient device for sensing the shredding action of the paper shredder, without the use of the expensive and unreliable delay circuit.
It is another objective of the present invention to provide a paper shredder with a relatively reliable device for sensing the shredding action of the paper shredder.
The foregoing objectives of the present invention are attained by a monitoring device which is located under a paper entry of the shredder and composed of two paper guiding grid plates, a microswitch, and a detecting rod. A paper guiding passage is formed between the two grid plates. A first paper guiding grid plate is provided with a fastening seat extending therefrom. The detecting rod is fastened pivotally with the fastening seat such that the detecting rod extends between the two grid plates. The microswitch is mounted on the fastening seat such that the microswitch is contiguous to the detecting rod. As the front end of a paper sheet has passed the paper guiding passage, the detecting rod is pushed by the front end of the paper to swivel to trigger the microswitch. As a result, the shredding tools remain in operation.
The foregoing objectives, features, functions, and advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
REFERENCES:
patent: 3724766 (1973-04-01), Bosland
patent: 5167374 (1992-12-01), Strohmeyer
patent: 5984215 (1999-11-01), Huang
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