Patent ID: 6308904
Filing Date: 2001-10-30
Classification: B02C

Abstract:
A delay drive-hanging device of a paper shredder that is provided with a delay hanging device at a paper entrance of the paper shredder, which device maintains the driving force for an appropriate period of time even after an end edge of the paper has been gripped and 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, the device includes a shaft end of a blade wheel shaft extending out of a machine base, the shaft end being linked to a driving shaft by means of a belt, the driving shaft being supported by shaft supports extending from an upper base of the machine base so as to be retained on the shaft supports and driven to rotate by the belt, the driving shaft having an end that couples to a control cylinder by means of minute friction, wherein rotation and halt of the control cylinder controls a delay trigger and a micro-switch, and the delay trigger and the micro-switch that is connected to a primary circuit are provided between a side of the paper entrance of an upper base and the control cylinder, whereby once the paper is inserted into the paper entrance, a paper entry dial of the delay tripper is pressed downwards subjecting a switch dial on another side of the delay trigger to elevate so as to press against a cantilever beam of the micro-switch thereby activating the motor to drive the blade wheel shaft to perform the shredding operation, characterized in that:the delay trigger is pivotally connected to a shaft support base of the upper base, the delay trigger including a lateral bar that is provided thereon with plural projecting dials, including the paper entry dial provided on a side next to the paper entrance, a switch dial provided on another side, and a retaining dial and a recovering dial that, respectively, interact with the micro-switch and the control cylinder; the control cylinder is provided on an end thereof with a sliding end face, the sliding end face being formed thereon with a notch that corresponds to and controls the cantilever beam of the micro-switch; the control cylinder is provided on a medial portion thereof with a projecting, clipping dial that corresponds to and controls the retaining dial of the delay trigger; the control cylinder incorporates a piece of resilient press plate that allows unidirectional movement, and corresponds to and controls the recovering dial of the delay trigger; whereby after the paper is inserted into the paper entrance, the paper entry dial is pressed downwards subjecting the switch dial on another side of the delay trigger to elevate so as to press against the cantilever beam of the micro-switch and to elevate the cantilever beam from the notch thereby activating the motor to drive the blade wheel shaft to perform the shredding operation, and at this moment, the belt drives the driving shaft and the control cylinder to drive rotation of the control cylinder such that the clipping dial contacts with the retaining dial due to the rotation, wherein during the entire shredding operation, because the paper continues to press against the paper entry dial, the retaining dial is in its elevated state; the control cylinder that is in frictional contact with the driving shaft is halted by resistance; once the paper has been fully gripped and passed the paper entrance, the pressure exerted on the paper entry dial diminishes allowing the retaining dial to press the clipping dial downwards; and at this moment, the cantilever beam of the micro-switch should have recovered to its deactivated state because of the downward movement of the switch dial, however, because the cantilever beam is now moved to the sliding end face from the notch of the control cylinder, the micro-switch is still under pressure and in its activated state; the driving shaft, thus, again drives the control cylinder to continue rotating from a halting state and the cantilever beam urges against the sliding end face; the micro-switch does not deactivate the motor until the rotation of the cylinder causes the cantilever beam to sink into the notch.