Segment Assembly Wrapping via Rolling Seat and Retaining Surface
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Solution Overview
Problem
Existing wrapping systems for rod-shaped articles, such as smoking articles, face challenges in securely wrapping assemblies of segments with varying hardness and rigidity, often resulting in misalignment and wrinkles, especially when using rigid segments like ceramic or hard plastic filter elements.
Innovation Solution
A method and system that utilize a three-point guiding contact system, where the assembly is rotated in a rolling seat while being moved along a retaining surface, ensuring constant pressure and controlled wrapping, preventing slippage and misalignment, and using a wrapping conveyor with a rolling seat and retaining surface to maintain a tight and uniform wrapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional wrapping systems are used to wrap assemblies of segments, then the wrapping process can be completed, but misalignment of individual segments occurs and wrinkles appear in the wrapping
Solution Approach 1:
The patent applies local quality by providing different types of contact at different locations: two rolling contacts at the bottom of the groove and one retaining contact on the retaining surface. This localized differentiation of contact functions ensures precise alignment and prevents misalignment of segments during wrapping, directly addressing the manufacturing precision issue.
Solution Approach 2:
The groove acts as an intermediary structure that guides and positions the assembly of segments. By confining the segments within the groove boundaries and providing specific contact points, the groove mediates between the wrapping mechanism and the segments, preventing misalignment and ensuring proper positioning throughout the wrapping process.
2Strength
If rigid segments are used in the assembly, then the desired hardness and structural integrity are achieved, but tight and unwrinkled wrapping becomes complicated
Solution Approach 1:
The patent changes the physical parameters of the wrapping process by introducing controlled rolling motion and specific contact pressures through the groove structure. This allows the wrapping material to be applied tightly and uniformly to rigid segments without causing misalignment or wrinkles, making the wrapping process easier despite the rigidity of the segments.
Solution Approach 2:
The groove is designed with curved surfaces that conform to the cylindrical shape of the segments. This curvature allows the wrapping material to follow the contour of the rigid segments smoothly, preventing wrinkles and ensuring tight wrapping while maintaining the structural integrity of the rigid segments.
3Productivity
If the wrapping conveyor moves at high speed to maintain production rates, then productivity is maintained, but reliable and slow wrapping is needed for quality
Solution Approach 1:
The groove structure performs preliminary positioning and alignment of the segments before the actual wrapping occurs. By pre-establishing the correct position and orientation of the segments in the groove, the system enables high-speed operation while maintaining wrapping quality, as the segments are already properly aligned when wrapping begins.
Solution Approach 2:
The groove structure enables self-alignment and self-positioning of the segments through its geometric constraints and contact points. This self-servicing mechanism eliminates the need for complex external alignment systems, allowing high-speed operation while maintaining precise wrapping quality through the inherent stability of the groove-assembly interaction.
Data Source
AI summary
In the method and system for wrapping an assembly (5) of segments, an outer periphery of the assembly is affixed longitudinally to an edge portion of a piece of wrapping material (50) and at least one of the segments of the assembly is a rigid segment with a compressibility higher than about 10 Newton per 1.5 mm. The assembly of segments is provided to a rolling seat (10) arranged in the peripheral surface of a wrapping conveyor (1). A retaining surface (202) is arranged at a distance and opposite the peripheral surface of the wrapping conveyor, such as to contact the assembly supplied to the rolling seat with the retaining surface. The assembly of segments are wrapped by moving the wrapping conveyor relative to the retaining surface thereby creating a relative movement between the wrapping conveyor and the retaining surface such as to cause rotation of the assembly in the rolling seat along a longitudinal axis of the assembly and by providing the assembly of segments with a three-point guiding contact while moving the assembly of segments along the retaining surface.