Chucking Apparatus Inclined Surface Segmentation
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Solution Overview
Problem
Conventional chucking apparatuses for recording disk drives face challenges in achieving a sufficient detaching force without increasing the radially outward force of the resilient member, leading to reduced operability and potential miscentering of the recording disk during mounting, which can result in poor centering precision and risk of the disk coming out due to centrifugal force or external impacts.
Innovation Solution
The chucking apparatus features a centering case with chuck pawls having a first and second inclined surface, a curved surface, and an auxiliary inclined surface, with a stepped recess, allowing for enhanced detaching force while maintaining low radially outward force, ensuring precise centering and secure disk retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the elastic force of the resilient member is increased to increase the detaching force, then the detaching force is increased, but it becomes difficult to move the chuck pawl radially inward and the mounting force is increased
Solution Approach 1:
The inclined surface of the chuck pawl is divided into multiple segments with different slopes. The first inclined surface has a gentler slope for mounting, while the second inclined surface has a steeper slope for detaching. This segmentation allows the same pawl structure to provide different force characteristics during mounting and detaching operations, resolving the contradiction between detaching force and mounting force.
Solution Approach 2:
Different regions of the chuck pawl's inclined surface are given different geometric properties. The outer region (first inclined surface) has a larger radius of curvature for easier mounting, while the inner region (second inclined surface) has a smaller radius of curvature for stronger detaching force. This local differentiation of geometric quality enables the pawl to optimize performance for both mounting and detaching functions.
2Ease of operation
If the tip end of the chuck pawl is set short to reduce mounting force, then the mounting force is reduced, but the angle formed between contact surfaces is adversely increased
Solution Approach 1:
The contact surface of the chuck pawl is segmented into two inclined surfaces with different angles. The first inclined surface has a smaller angle for reduced mounting force, while the second inclined surface has a larger angle for increased detaching force. This segmentation resolves the contradiction by allowing different angular characteristics in different regions of the same pawl structure.
Solution Approach 2:
The solution moves from considering a single inclined surface to a two-dimensional surface with varying slopes. By introducing the concept of multiple inclined surfaces with different radii of curvature, the design optimizes both mounting and detaching forces through geometric dimensioning rather than simply changing the tip length.
3Ease of operation
If the curvature of the inclined surface is small to reduce mounting force, then the mounting force is reduced, but the angle formed between contact surfaces is adversely increased
Solution Approach 1:
The inclined surface is segmented into two distinct regions with different curvatures. The first inclined surface has a larger radius of curvature for easier mounting with smaller force, while the second inclined surface has a smaller radius of curvature for better centering precision and larger detaching force. This segmentation resolves the contradiction between mounting ease and centering precision.
Solution Approach 2:
Different regions of the inclined surface are assigned different geometric qualities - the outer region has larger curvature for mounting comfort, while the inner region has smaller curvature for precision centering. This local differentiation of geometric properties allows simultaneous optimization of both mounting force and centering precision.
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 design effectively increases the detaching force without compromising the mounting force, enhancing the reliability and durability of the chucking apparatus and preventing disk misalignment or ejection due to centrifugal forces or impacts.
Implementation Method 1
a resilient member for biasing the chuck pawls radially outward
Implementation Method 2
Each of the chuck pawls includes a base accommodated in a centering case, and a tip end projecting from an outer periphery of the centering case for holding the recording disk. The tip end of the chuck pawl is formed with a first inclined surface... a second inclined surface... and a curved surface
Data Source
AI summary
A second inclined surface (84c) which abuts against a recording disk of a chuck pawls (84) of a recording disk holding mechanism (80), and a third inclined surface (84d) which is a curved surface for guiding chucking motion of the chuck pawls (84) are provided. A boundary between the second inclined surface (84c) and the third inclined surface (84d) is formed with a stepped recess approaching a base.