Pencil Shaping Device with Axial Displacement and Elastic Return
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Solution Overview
Problem
Existing pencils with spindle-driven sharpening mechanisms have a predetermined axial movement, limiting the user's ability to individually select the sharpening or cutting operation of the lead.
Innovation Solution
The shaping device is made axially displaceable with respect to the lead, decoupling it from the spindle drive, allowing for independent selection and featuring a handle for dual function actuation and a sleeve for limiting displacement, along with an elastic return mechanism to prevent excessive sharpening, and a transparent protective cap for visibility during sharpening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the shaping device is coupled to the spindle drive with fixed axial movement, then the sharpening operation is automated, but the user cannot individually select the axial movement distance
Solution Approach 1:
The patent separates the shaping device from the spindle drive mechanism, allowing the shaping device to be displaced axially independently of the lead's rotational movement. This segmentation enables the user to control the axial displacement distance separately from the automated rotation, achieving both automation and individual selectability.
Solution Approach 2:
The shaping device is made dynamically adjustable through a displacement mechanism that allows variable axial movement. The user can adjust the axial position of the shaping device before each sharpening operation, enabling flexible control over the sharpening depth while maintaining automated rotation during the actual sharpening process.
2Adaptability or versatility
If the shaping device is displaced axially with respect to the lead, then individual axial movement selection is enabled, but the structure becomes more complex
Solution Approach 1:
The axial displacement mechanism serves multiple functions: it controls the sharpening depth, limits the maximum sharpening distance, and works in conjunction with the elastic return force to provide both positioning and reset functionality. This multi-functionality reduces the need for separate components for each function.
Solution Approach 2:
An elastic element (spring) is introduced as an intermediary between the shaping device and the lead. This elastic element provides the return force to reset the shaping device after displacement while also serving as a mechanical indicator of the displacement state, simplifying the overall control mechanism.
3Productivity
If the shaping device bears against the lead continuously, then sharpening is effective, but excessive sharpening cannot be prevented
Solution Approach 1:
The elastic return force is applied in advance to counteract any excessive displacement of the shaping device. This preliminary anti-action prevents the shaping device from moving beyond the safe axial displacement limit, thereby preventing excessive sharpening before it can occur.
Solution Approach 2:
The elastic element provides continuous feedback on the axial position of the shaping device. When the shaping device approaches the maximum displacement limit, the elastic force increases, providing tactile feedback to the user and mechanically preventing further excessive displacement that would lead to over-sharpening.
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
This solution allows for customizable sharpening and cutting operations, preventing excessive sharpening and enabling users to adjust the lead length and visibility during the sharpening process, enhancing user control and precision.
Implementation Method 1
an elastic device which is pressure-loaded to produce the return force
Implementation Method 2
it can involve for example a coil spring
Data Source
AI summary
The invention concerns a pencil comprising a lead, a protective cap and a device for shaping the lead in the protective cap.According to the invention it is provided that the shaping device is displaceable axially with respect to the lead when the protective cap is fitted. (FIG. 1)