Solid material comminution or disintegration – Apparatus – With automatic control
Reexamination Certificate
2000-05-15
2001-10-30
Tolan, Ed (Department: 3725)
Solid material comminution or disintegration
Apparatus
With automatic control
C241S236000
Reexamination Certificate
active
06308904
ABSTRACT:
SUMMARY OF INVENTION
This invention is related to a delay drive-hanging device of a paper shredder. The paper shredder is provided with a linked delay device that maintains continuous driving force within the duration from insertion of paper between blade wheel shafts to termination of shredding operation so as to effectively grip and then strip the paper. The device is provided on the blade wheel shafts; the device drives and connects to a link bar by means of a belt. The link bar has an end that couples to a control cylinder by means of minute friction. A delay trigger for a paper entry dial is provided between a side of the paper entrance and the control cylinder. A micro-switch is connected to a primary circuit. The control cylinder has an end face having a notch that corresponds to and controls a retaining dial of the delay trigger. The control cylinder is provided on another side with a resilient press plate that corresponds to and controls a recovering dial. Further, the delay trigger is provided with a cantilever beam at a location adjacent the micro-switch such that insertion of paper changes orientation of the delay trigger to cause the cantilever beam to contact with and to activate the micro-switch; after an end edge of the paper is gripped, the delay trigger is triggered by the retaining dial to recover to its original state, while the end face of the control cylinder urges against the micro-switch such that the micro-switch continues to be activated for a while until the control cylinder completes a full rotation subjecting the cantilever beam to sink in the notch so as to cease the driving force.
Paper shredders are used to prevent leakage of printed information such that confidential information can be diminished along with the paper after passing through the paper shredders. Conventional paper shredders each include a motor that drives rolling blades through a gearbox such that the blade edges (each in a tined or serrated form) grip the paper and then shred the paper into strips or fragments. However, conventional paper shredders are driven in such a manner that, when paper is inserted into the paper entrance of the paper shredders, gravitational force of the inserted paper lightly strokes a micro-switch so as to activate the power empowering the motor to drive the blade wheel to grip and then strip the paper. However, once the end edge of the paper has been gripped, the stroking force as a result of the gravitational force gradually reduces and eventually diminishes. Since the micro-switch is away from the shredding blade wheel at a distance, the motor ceases rotation before the paper has been fully shredded to leave a non-shredded segment next to the paper entrance, which segment is not gripped and shredded until the next shredding operation that activates the motor. Such a non-shredded segment may leak the confidential information, and the paper fragments left between the blade wheels may also obstruct the paper entry of the next shredding operation.
Therefore, using the paper to activate the micro-switch is insufficient to fully shred the paper, because the micro-switch is provided at the upstream and the shredding blade wheel is at the downstream that is away from the upstream at a distance, which is the cause of leaving a non-shredded segment. Since difficulties involved in changing the mechanisms, one solution is to prolong the driving duration of the blade wheel so as to fully shred the paper.
One known solution for delaying the above motor operation relies on electronic components provided on a printed circuit board (PCB). However, disadvantages, such as high cost of the electronic components, and damages of the electronic components that cause malfunctioning of the entire PCB, are maintenance problems that manufacturer and consumers have encountered with such a solution.
In view of the above, the “delay drive-hanging device of a paper shredder” of this invention is invented in an attempt to solve the above problems after diligent trials and researches.
It is thus a primary object of this invention to provide a delay drive-hanging device of a paper shredder that, insertion of the paper into the paper entrance activates the micro-switch to allow the blade to shred the paper, and that maintains the driving force for an appropriate period of time even when the micro-switch is no longer stroked by the paper such that the paper can be fully gripped and shredded and such that the paper fragments can be discharged from the blade wheel.
In order to clearly delineate the objects, characteristics and advantages of the present invention, a few preferred embodiments are specifically explained in detail in accompany with the drawings as follows.
REFERENCES:
patent: 5167374 (1992-12-01), Strohmeyer
patent: 5772605 (1998-07-01), Tsai
patent: 5984215 (1999-11-01), Huang
patent: 6213417 (2001-04-01), Schwelling
Dougherty & Troxell
Tolan Ed
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