Patterned Restraining Surface for Stable Friction in Conveying
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Solution Overview
Problem
Conventional restraining members, such as presser-foot members and conveying rolls, experience a decrease in frictional performance over time, leading to reduced processing accuracy and the need for frequent replacements, resulting in complex apparatus designs.
Innovation Solution
A restraining member with a patterned frictional surface featuring island-shaped parts and depressions, arranged in a specific periodic pattern to maintain high frictional performance and prevent degradation, suitable for various materials and applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional restraining member with a flat frictional surface is used, then the initial frictional performance is sufficient, but the frictional performance gradually decreases through repeated use
Solution Approach 1:
The frictional surface is segmented into multiple island-shaped parts separated by depressions, creating a patterned surface. This segmentation prevents the entire surface from wearing down uniformly, maintaining frictional performance over extended use. The island-shaped parts are arranged in a periodic pattern with specific pitch ratios to optimize friction while reducing degradation.
Solution Approach 2:
Different regions of the frictional surface have different properties - the island-shaped parts provide high friction contact areas while the depressions between them reduce overall contact pressure and prevent uniform wear. This local variation in surface quality maintains frictional performance consistency throughout the service life.
2Manufacturing precision
If the frictional performance of the restraining member decreases, then processing accuracy is reduced, but replacing the restraining member increases device complexity and maintenance requirements
Solution Approach 1:
The patterned surface structure self-regulates frictional performance by distributing contact forces across multiple island-shaped parts. This self-adjusting mechanism maintains consistent friction and processing accuracy without requiring external intervention or complex replacement schedules, simplifying device operation and maintenance.
3Productivity
If a restraining member with high initial frictional performance is designed, then conveying performance is improved, but the structure becomes more complex to account for friction degradation
Solution Approach 1:
The frictional characteristics are optimized by changing the geometric parameters of the patterned surface - specifically the pitch ratio between island-shaped parts and depressions. By controlling this parameter within specific ranges, high frictional performance is achieved while the simplified periodic structure avoids complexity, eliminating the need for conservative design margins.
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 patterned surface design provides superior frictional performance that remains consistent over use, enhancing processing and conveying accuracy and device workability, reducing maintenance needs and extending the lifespan of the apparatus.
Implementation Method 1
a frictional surface configured to press against an object to restrain the object and exert a frictional force on the object
Data Source
AI summary
A restraining material includes a frictional surface configured to press against an object to restrain the object and exert a frictional force thereon. The frictional surface is a pattern surface of a base material of the restraining member that will directly contact with the object. The pattern surface includes island-shaped parts separated by a depression and periodically arranged. The depression has a depth of 15 to 50 μm with respect to the frictional surface. A periodic arrangement direction of the island-shaped parts includes a direction defined by that: a pattern index determined by dividing an arrangement pitch of the island-shaped parts in a periodic arrangement direction by the maximum diameter of each island-shaped part in the periodic arrangement direction falls within a range of 1.0 to 100, and the maximum diameter of each island-shaped part in the periodic arrangement direction falls within in a range of 0.1 to 2 mm.