Electric Pencil Sharpener Delay Mechanism for Tip Smoothing
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Solution Overview
Problem
Current electric pencil sharpeners suffer from sudden motor stoppage after sharpening, leading to cutting dents, rough cutting surfaces, and leftover pencil shavings, necessitating manual polishing which is inefficient and can pollute the pencil tip.
Innovation Solution
An electric pencil sharpener with a delay function that includes a motor, drive assembly, gear assembly, and cutter assembly, where the connecting rod's backward motion engages the stop trigger with a teeth structure, delaying the motor stop and allowing the cutter assembly to smooth the pencil tip during this delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor is immediately stopped after sharpening, then the sharpening process is completed quickly, but cutting dents are formed on the pencil tip and the cutting surface becomes rough
Solution Approach 1:
The patent applies preliminary action by extending the motor operation beyond the immediate completion of sharpening. The delay mechanism keeps the motor running for an additional period after the pencil is removed, allowing the cutter to perform a preliminary smoothing action that prevents surface roughness and cutting dents before the motor finally stops.
2Productivity
If the motor continues to rotate after cutting, then the cutting surface is smoothed and shavings are removed, but additional manual polishing is unnecessary, then productivity is improved, but energy consumption increases
Solution Approach 1:
The patent applies continuity of useful action by extending the motor's useful operation into the delay period. Instead of stopping immediately when sharpening is complete, the motor continues to rotate and drive the cutter, which continuously smooths the cutting surface and removes shavings during the delay period, making the entire motor operation period productive rather than including wasted energy consumption.
3Manufacturing precision
If a delay function is added to the sharpener, then cutting effect is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by combining the delay function with the existing mechanical structures of the sharpener. The delay mechanism is integrated into the motor control system and cutter assembly, using the same mechanical components that already exist in the sharpener, rather than adding entirely separate delay mechanisms, thereby reducing overall device complexity.
Solution Approach 2:
The patent applies self-service by designing the delay mechanism to automatically control the motor extension based on the sharpening completion detection. The system self-regulates the delay period and motor continuation without requiring external control or additional complexity, as the mechanical structures themselves provide the timing and control functions.
4Duration of action of moving object
If the connecting rod moves backward to engage the stop trigger, then the motor stop is delayed, but the structure becomes more complex
Solution Approach 1:
The patent applies universality by designing the connecting rod to serve multiple functions: it transfers motion during sharpening, controls the start trigger, and now also controls the stop trigger through its backward movement. This multi-functionality allows the delay feature to be implemented without adding separate control mechanisms, thereby avoiding increased structural complexity.
Solution Approach 2:
The patent applies the intermediary principle by using the connecting rod as a mediator between the cutter assembly and the stop trigger. The connecting rod's backward movement indirectly actuates the stop trigger through mechanical interaction, providing a simple intermediary mechanism that delays motor stoppage without requiring direct control or complex signaling systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The delay function ensures a smoother cutting effect, reduces manual polishing needs, and maintains motor rotation for a period after cutting, enhancing safety and reliability while maintaining a simple and cost-effective structure.
Implementation Method 1
a friction structure, the connecting rod is provided with a ring portion for matching with the friction structure
Data Source
AI summary
An electric pencil sharpener with delay function includes a motor, a drive assembly, a gear assembly and a cutter assembly. The drive assembly includes a connecting rod, a drive shaft and a start trigger, a stop trigger, and a thrust plate. The connecting rod is moved backward to drive the start trigger to trigger the motor, and synchronously rotated with the cutter assembly; the stop trigger is provided with a teeth structure and a friction structure respectively. The thrust plate is rotated or moved to push against the drive shaft, so that the connecting rod continues to move backwards until the bulge portion engages with the teeth structure, and the ring portion matches with the friction structure, thereby actuating the stop trigger to move to trigger an action of the stop switch of the motor.