Reel Engaging Portion Positioning for Braking Accuracy
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Solution Overview
Problem
Existing recording tape reels face challenges in accurately engaging with braking members due to warping and dispersion in the welding region, affecting the uniformity and accuracy of the engaging portion's height from the reel gear.
Innovation Solution
The engaging portion is formed at the lower flange instead of the extending portion, allowing for separate dimensional accuracy and improved strength through an annular shape, with a position prescribing portion at the lower flange for precise welding alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the engaging portion is formed at the top surface of the extending portion that is welded to the hub, then the structure is integrated, but the accuracy of the engaging portion is affected by warping and dispersion in the welding region
Solution Approach 1:
The reel is divided into distinct components: the hub, the extending portion, and the lower flange with the engaging portion. By separating the engaging portion from the welding region, the patent ensures that welding variations do not affect the dimensional accuracy of the engaging portion, thereby resolving the contradiction between structural integration and manufacturing precision.
2Device complexity
If the engaging portion is formed at the extending portion, then the structure is simplified, but the strength of the extending portion is reduced
Solution Approach 1:
The patent separates the engaging portion from the extending portion, placing it on the lower flange instead. This segmentation allows the extending portion to be designed as a simple annular structure optimized for strength, while the engaging portion is positioned in a location (lower flange) that does not compromise the extending portion's structural integrity.
3Strength
If the lower flange is welded to the extending portion with the reel plate region as welding region, then the reel plate is securely fixed, but the welding dispersion affects the engaging portion's dimensional accuracy
Solution Approach 1:
The engaging portion is extracted from the welding region and placed on the lower flange. This extraction ensures that the welding process used to secure the reel plate does not affect the dimensional accuracy of the engaging portion, thereby resolving the contradiction between strong fixation and precision.
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 configuration ensures accurate engagement with the braking member, maintains strength, and eliminates the impact of welding dispersion on the engaging portion's accuracy, enabling reliable rotation locking and unlocking of the reel.
Implementation Method 1
the lower flange being welded to the extending portion of the hub
Data Source
AI summary
The present invention provides a reel having an engaging portion that can engage accurately with a braking member. A reel 30 has: a hub 32, an extending portion 36 being formed at a peripheral edge of a lower end portion of the hub 32; an upper flange 38 provided integrally at a peripheral edge of an upper end portion of the hub 32 so as to extend outward; and a lower flange 40 having a floor wall 42 to which a reel plate 46 is fixed, the lower flange 40 being welded to the extending portion 36 of the hub 32. In this reel 30, an engaging portion 48 is formed at the lower flange 40, the engaging portion 48 engaging with a braking member 60 that is held so as to be unable to rotate at the case 12 at times of non-use.