Drive Device Flange Segmentation for Tape Positioning
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Solution Overview
Problem
Existing drive devices fail to accurately restrict the transverse position of recording tapes, particularly magnetic tapes, due to flange deformation and interference issues, which affects the precision of tape guidance and data reading/writing.
Innovation Solution
A drive device design featuring a hub with rotating flanges connected by a side wall and fixed to a casing, using rolling bearings to allow relative rotation and suppress flange deformation, ensuring accurate tape guidance and preventing interference between the hub and flanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If flanges are made to rotate with the hub, then the structure allows relative movement, but flange deformation occurs and positioning accuracy deteriorates
Solution Approach 1:
The flange is divided into two functional parts: a rotating portion that rotates with the hub and a non-rotating portion that maintains fixed positioning. This segmentation allows the flange to rotate for operational flexibility while maintaining positioning accuracy through the stationary portion.
Solution Approach 2:
A bearing is introduced as an intermediary element between the hub and the flange. The bearing supports the rotating portion while allowing the non-rotating portion to maintain its position, thus mediating between the rotational movement requirement and the positioning accuracy requirement.
2Manufacturing precision
If flanges are fixed to prevent deformation, then positioning accuracy improves, but the structure becomes more rigid and complex
Solution Approach 1:
The flange is segmented into rotating and non-rotating portions, allowing the non-rotating portion to be rigid and fixed for positioning accuracy while the rotating portion provides operational flexibility, thus reducing the need for overall structural rigidity.
Solution Approach 2:
The flange transitions from a completely fixed structure to a dynamic structure where part of it can rotate. This dynamic capability allows the flange to adapt to operational requirements while maintaining positioning accuracy through the fixed portion.
3Manufacturing precision
If tape guides restrict transverse position, then positioning accuracy improves, but edge damage increases due to external force effects
Solution Approach 1:
The harmful function of the flange (restricting transverse position) is extracted and separated from the positioning function. The non-rotating portion maintains positioning accuracy while the rotating portion eliminates the harmful clamping force that causes edge damage.
Solution Approach 2:
The potential harm of flange rotation (causing deformation) is converted into a benefit by introducing the bearing that controls the rotation. The controlled rotation of the rotating portion eliminates the harmful clamping force while the bearing ensures positioning accuracy is maintained.
Data Source
AI summary
There is provided a drive device including: a hub around which a recording tape is wound; a pair of flanges that are provided at both axial direction sides of the hub so as to be able to rotate relative to the hub, and that restrict a position, in a transverse direction, of the recording tape; a connecting member that connects outer peripheral portions of the pair of flanges together at least at a portion other than a traveling path of the recording tape; and a casing having, at an interior, a space in which the hub and the pair of flanges are accommodated and in which the recording tape travels, a fixing portion, that is provided at at least one of the pair of flanges or at the connecting member, being fixed to the casing.