Adjustable Pencil Sharpener Feedback Mechanism
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Solution Overview
Problem
Conventional pencil sharpeners lack a clear feedback mechanism to indicate when the sharpening process is complete, leading to user confusion and potential over-rotation of the adjusting mechanism.
Innovation Solution
An adjustable pencil sharpener with a rotating knob and positioning segments in the waste case, generating vibrations and sounds when the engaging segments align, providing a clear signal that the sharpening process is finished.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pencil sharpener uses a rotating board to adjust blade position for varying sharpness, then the pencil tip can be sharpened into varying degrees of sharpness, but the user cannot receive clear feedback to know when the adjusting process is completed
Solution Approach 1:
The patent introduces a feedback mechanism through engagement between positioning segments on the rotating board and corresponding engagement structures on the blade base. When the rotating board is rotated to a correct position, the engagement produces a detectable signal (such as a click or positional stop) that clearly indicates the adjusting process is completed. This resolves the contradiction by providing adaptability through rotation while simultaneously improving ease of operation through clear user feedback.
2Adaptability or versatility
If the rotating board is allowed to rotate freely to adjust blade position, then various sharpness levels can be achieved, but the rotating board may be over-rotated or the user may be confused about the rotation direction
Solution Approach 1:
The patent divides the rotating board into discrete angular positions with positioning segments at specific locations. These segments engage with corresponding structures on the blade base to create distinct, reliable stopping positions. This segmentation ensures that the rotating board can cover various sharpness levels while preventing over-rotation and providing reliable, accurate positioning at each adjustment level.
Solution Approach 2:
The engagement between positioning segments and the blade base provides tactile and positional feedback to the user, confirming when a valid adjustment position is reached. This feedback mechanism enhances reliability by preventing incorrect or excessive rotation while maintaining the full range of adjustable sharpness levels.
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
Enables precise control over pencil tip sharpness by providing a clear feedback signal, ensuring the sharpening process is completed effectively and efficiently.
Implementation Method 1
With the engagement between at least one engaging segment on a rotating knob and positioning segments on a waste case, vibrations and sounds will be generated to provide users with a clear feedback signal that the adjusting process is completed.
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A pencil sharpener has a waste case (10), a blade base (20), a blocking chunk (30), a blade (40), a rotating knob (50) and an adjusting shaft (60). The waste case (10) has a mounting hole (111) and multiple positioning segments (112). The blocking chunk (30) is moveably mounted on the bottom of the blade base (20) along an axial direction. The blade (40) is mounted securely on the blade base (20). The rotating knob (50) is mounted rotatably in the mounting hole (111) and has at least one engaging segment (532) selectively engaging the positioning segments (112). The adjusting shaft (60) is connected securely with the rotating knob (50) and is disposed on the blocking chunk (30). When the rotating knob (50) is rotated, the adjusting shaft (60) is rotated to push the blocking chunk (30) to move along the axial direction of the blade base (20).