Two-way self-lock paper shredder with electronic control circuit
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Solution Overview
Problem
Existing paper shredders lack a reliable mechanism to automatically lock during shredding and ejection processes, posing safety risks, especially when users forget to engage the lock function, leading to potential accidents.
Innovation Solution
A two-way self-lock paper shredder equipped with an electronic control circuit that includes a CPU, motor-driving circuit, paper-in detection circuit, reverse detection circuit, unlocking circuit, and overload protection circuit, which automatically locks the shredder when not in use and prevents accidental operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical lock switch is used to control the paper shredder, then the device can be locked after shredding, but the user may forget to engage the lock function, causing safety hazards
Solution Approach 1:
The control circuit automatically detects when paper shredding is complete and engages the lock function without requiring user intervention. The system serves itself by monitoring its own operational state and autonomously transitioning to a locked state, eliminating the need for users to remember to manually engage the lock switch.
Solution Approach 2:
The control circuit continuously monitors the operational status of the paper shredder through feedback from sensors and operational signals. When it detects that shredding is complete, the feedback mechanism triggers the automatic locking sequence, ensuring the device transitions safely to a locked state based on real-time operational information.
2Productivity
If the paper shredder automatically starts when detecting articles at the paper inlet, then shredding efficiency is improved, but safety hazards occur when children or unauthorized persons access the device
Solution Approach 1:
The lock function is engaged as a preliminary action before the paper shredder begins automatic operation. By ensuring the device is securely locked and authenticated beforehand, the system prevents unauthorized access while maintaining efficient automatic shredding capability for authorized users.
Solution Approach 2:
The automatic locking mechanism applies a preliminary counter-action to prevent harmful effects before they can occur. By automatically engaging the lock after shredding completion, the system proactively prevents potential safety hazards from unauthorized access rather than reacting to problems after they arise.
3Reliability
If a lock function is added to the paper shredder, then safety is improved, but the device complexity increases due to additional switches and mechanical components
Solution Approach 1:
The patent replaces the traditional mechanical lock switch system with an electronic control circuit that integrates locking functionality into the existing motor control system. This substitution eliminates the need for separate mechanical locking components while achieving the same safety objective through electronic control.
Solution Approach 2:
The control circuit merges the lock function with the existing motor control circuitry, combining multiple functions (motor control, operation detection, and locking) into a single integrated system. This merging reduces overall device complexity by eliminating separate mechanical locking components and utilizing the existing electronic control infrastructure.
Data Source
AI summary
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.