Reel Hub Reinforcement Ring Positioning
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Solution Overview
Problem
The hub of recording tape reels is prone to deformation under winding pressure, leading to positional shifting and deformation of the metal reinforcement ring during resin injection molding, which compromises the structural integrity and stability of the reel.
Innovation Solution
A cylindrical reinforcement ring with a resin ring integrally molded on its outer surface, featuring exposure portions and strategically placed anti-rotation grooves and ribs to prevent positional shifting and deformation, ensuring the hub's stability and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal ring is used to reinforce the hub, then the hub strength is improved, but the metal ring position shifts during resin injection molding
Solution Approach 1:
The patent applies preliminary action by pre-forming positioning protrusions on the metal ring and corresponding positioning recesses in the mold before injection molding. These positioning features are prepared in advance to prevent the metal ring from shifting during the resin injection process, thereby maintaining manufacturing precision while preserving the strength enhancement provided by the metal ring reinforcement.
2Device complexity
If the hub is formed as a bottomed circular cylinder with one open end, then the manufacturing complexity is reduced, but the hub strength deteriorates due to easy deformation
Solution Approach 1:
The patent employs composite materials by combining a metal ring with resin material to form an integrated hub structure. The metal ring provides the necessary strength and rigidity to prevent deformation, while the resin material maintains manufacturing simplicity and allows for the bottomed circular cylinder design with one open end. This composite approach resolves the contradiction by achieving both structural strength and manufacturing ease.
3Stability of the object's composition
If the metal ring is integrated with resin through insert molding, then the structural integrity is improved, but the metal ring deformation is caused by resin pressure during injection
Solution Approach 1:
The patent applies preliminary action by pre-forming positioning protrusions on the metal ring and corresponding positioning recesses in the mold before injection molding. These positioning features are prepared in advance to constrain the metal ring during resin injection, preventing deformation caused by resin pressure while maintaining the structural integrity benefits of integrated molding.
Solution Approach 2:
The positioning protrusions and recesses act as intermediary elements between the metal ring and the mold. These intermediaries transmit and distribute the resin injection pressure uniformly, preventing direct concentrated pressure on the metal ring that would cause deformation, while still allowing the resin to fully integrate with the metal ring structure.
Data Source
AI summary
A reel includes a hub around which recording tape is wound and flanges that are disposed on both end portions of the hub and hold width direction end portions of the recording tape. The hub includes a cylindrical reinforcement ring, a resin ring integrally molded on the outer peripheral surface of the reinforcement ring, and a consecutive portion made of resin that covers one end portion of the reinforcement ring and is continuous with the resin ring. Exposure portions where the one end portion of the reinforcement ring is exposed are formed in the consecutive portion.