Curved Profile Drive Rollers for Sheet Material Feeding
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Solution Overview
Problem
Existing drive systems for sheet materials, such as paper, tend to cause tearing and misalignment due to the way they pull the paper, leading to increased costs when trying to address these issues with non-standard rollers or gears.
Innovation Solution
The use of rollers with curved profiles that are tangent to each other when not in contact with the sheet material, made from molded elastomer wheels like urethane, which rotate to feed the paper without significant cost increases, allowing for even feeding regardless of the paper's angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional drive systems use standard cylindrical rollers or gears to feed sheet material, then the device complexity is low and manufacturing cost is reduced, but the sheet material experiences tearing and misalignment during feeding
Solution Approach 1:
The patent applies curved profiles to the rollers instead of traditional cylindrical shapes. The first roller has a curved profile with radius of curvature R1 and the second roller has a curved profile with radius of curvature R2, where the sum of these radii equals the center-to-center distance between the rollers. This curvature allows the rollers to conform to each other and to the sheet material, distributing contact pressure and preventing tearing while maintaining alignment, thus resolving the contradiction between reliability and device complexity.
2Reliability
If non-standard rollers or gears are used to prevent paper tearing and misalignment, then sheet material integrity improves, but the manufacturing cost increases significantly
Solution Approach 1:
The patent changes the geometric parameters of the rollers by defining specific curved profiles with radii of curvature R1 and R2 that satisfy the relationship R1 + R2 = center-to-center distance. This parameter-based approach allows for standardized manufacturing of curved rollers using common elastomer materials, avoiding the need for expensive custom-machined components while maintaining sheet material integrity and reducing manufacturing costs.
3Ease of operation
If the rollers are made from molded elastomer wheels, then the sheet material feeding becomes smoother and alignment improves, but the device complexity increases
Solution Approach 1:
The patent employs molded elastomer wheels as the roller material, combining the curved geometric profile with elastomeric material properties. The elastomer provides friction-based grip on the sheet material for smooth feeding, while the curved profile ensures proper alignment and contact. This composite approach of shape plus material properties achieves ease of operation without requiring complex mechanical drive mechanisms, as the elastomer wheels can be directly molded and mounted on simple shafts.
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 effectively reduces paper tearing and misalignment while maintaining a cost-effective approach by using readily available and durable elastomer wheels, ensuring smooth and centered feeding of the paper.
Implementation Method 1
molded elastomer wheels... rotate to feed the paper
Data Source
AI summary
A drive system is configured to feed a sheet material. The drive system includes a first roller and a second roller. A circumference of the first roller has a first curved profile. A circumference of the second roller has a second curved profile. The first and second rollers are arranged such that, when the sheet material is not located between the first and second rollers, the first curved profile of the first roller contacts the second curved profile of the second roller. The first and second rollers are further arranged such that, when the sheet material is located between the first and second rollers, rotation of at least one of the first and second rollers causes the sheet material to be fed through the drive system.