| 摘要 |
A two-way self-lock paper shredder has a functional switch (11), a shredding mechanism (10), a control circuit power source (2) electrically connected to the said functional switch (11), as well as the following control circuits: a CPU (1), a motor-driving circuit (8), a reverse detection circuit (9), a paper-in detection circuit (5), and an unlocking circuit (4). If there is neither an input of paper-in signal nor an input of reverse signal after the paper is shredded, the said paper-in detection circuit (5) will transfer a self-lock signal to said CPU (1) and then the CPU (1) begins timing. When the duration of said self-lock signal exceeds the preset value, the CPU (1) will shut off the motor-driving circuit (8) and the paper shredder will be self-locked. The aforesaid unlocking circuit (4) contains an unlocking key, and reset of the said unlocking key can unlock the paper shredder. The present utility model enhances the safety of the paper shredder efficiently, so as to avoid unnecessary hidden trouble.
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