Coating Film Transfer Tool Torque Stability via Resin Intermediary
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Solution Overview
Problem
Existing coating film transfer tools using compression springs face variability in rotational torque due to surface state issues and creep, leading to instability and increased wear, making it difficult to maintain consistent torque from initial to final usage.
Innovation Solution
An automatically winding type coating film transfer tool design where a paying-out core and rewinding core are interlocked via a power transmission mechanism, using a compression spring as the resilient body that rotates integrally with specific components to generate rotational torque, minimizing variability and creep effects by distributing frictional forces across multiple sliding surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compression spring is used as the resilient body, then the rotational torque can be adjusted and maintained stable for a long time, but the surface state variability of the spring wire causes high variability in generated rotational torque
Solution Approach 1:
A resin layer is introduced as an intermediary between the compression spring and the mating members (rewinding button and paying-out core gear). This resin layer mediates the contact interface, absorbing surface state variations of the spring wire and providing a consistent friction interface. The resin layer has controlled friction characteristics that ensure stable rotational torque generation regardless of spring wire surface conditions.
Solution Approach 2:
The friction characteristics of the contact interface are modified by changing the material parameter from metal-to-metal contact to metal-to-resin contact. The resin layer provides controlled friction with coefficients that are less sensitive to surface roughness variations, thereby stabilizing the rotational torque output across different spring wire surface states.
2Reliability
If the rotational torque is set to a relatively high value to ensure winding at the lowest expected torque, then winding reliability is improved, but usability is worsened due to larger force required for transfer
Solution Approach 1:
The friction characteristics at the contact interface are optimized by using a resin layer with specific friction properties. This allows the system to generate sufficient rotational torque for reliable winding while maintaining lower contact forces during normal operation. The resin's friction characteristics provide consistent torque multiplication without requiring excessively high input forces.
3Device complexity
If the compression spring slides on mating members with variable surface conditions, then the mechanism remains simple, but the rotational torque changes between initial use and final use due to wear and surface state changes
Solution Approach 1:
The resin layer serves as a protective intermediary between the compression spring and the mating members. This layer prevents direct metal-to-metal contact, reducing wear on both the spring and the gear components. The resin maintains stable friction characteristics throughout the service life, ensuring consistent rotational torque from initial use to final use.
Solution Approach 2:
The resin layer acts as a sacrificial element that can be easily replaced. While the resin may wear over time, it protects the more expensive and critical components (compression spring, gear, button). The resin layer can be renewed without replacing the entire mechanism, maintaining simplicity while ensuring long-term reliability.
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 achieves long-term stability and minimal variability in rotational torque, reducing wear and maintaining consistent performance from initial to final usage without being affected by the surface state of the resilient body.
Implementation Method 1
a rotational torque of the rewinding core or the paying-out core is generated by a frictional force generating on a sliding surface between components by using a restoring force of a resilient body
Implementation Method 2
resiliency of a compression spring
Data Source
AI summary
A coating film transfer tool in which a rotational torque with the least variability may be generated without being affected by a surface state of a resilient body may include: a paying-out core having a coating film transfer tape wound thereon; and a rewinding core that rewinds the coating film transfer tape after use. The paying-out core and the rewinding core are interlocked via a power transmission mechanism in a case. The transmission mechanism generates a rotational torque by a frictional force on a sliding surface between components, by using a restoring force of a resilient body. The resilient body is configured to rotate integrally with a component A that comes into contact with one end of the resilient body and a component B that comes into contact with the other end.