Media Storing Feeding Device Torque Limiter Speed Control
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Solution Overview
Problem
Existing media storing and feeding devices face issues with torque limiters having short lifetimes due to high angular speeds and requiring expensive high-speed models, and they often need to use four expensive one-way clutches, increasing costs and complexity.
Innovation Solution
The media storing and feeding device configures the reel shaft to rotate at a faster speed than the drum during feeding and a slower speed than the drum during storing, with the torque limiter absorbing the speed difference, allowing for reduced angular speeds and fewer one-way clutches, thus extending torque limiter lifespan and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drum and reel rotate at high angular speeds to feed media quickly, then the feeding speed is improved, but the torque limiter lifetime is reduced due to high rotational stress
Solution Approach 1:
The patent makes the reel shaft rotation speed variable relative to the drum speed. During feeding operation, the reel shaft rotates faster than the drum to enable quick media discharge. During storing operation, the reel shaft rotates slower than the drum to reduce torque limiter stress. This dynamic speed adjustment allows the system to achieve high feeding speed when needed while protecting the torque limiter during less critical operations.
Solution Approach 2:
The patent changes the rotational speed parameter of the reel shaft based on operational mode. By controlling the reel shaft to rotate at different speeds relative to the drum (faster during feeding, slower during storing), the system optimizes both feeding performance and torque limiter durability. The torque limiter absorbs speed differences, preventing excessive rotational stress.
2Reliability
If conventional drive mechanisms are used with multiple one-way clutches, then the drum can wind and rewind tapes reliably, but the device complexity and cost increase
Solution Approach 1:
The patent removes two of the four conventional one-way clutches from the drive mechanism. By making the reel shaft rotation speed controllable independently, the system eliminates the need for one-way clutches on the reel shaft, simplifying the structure while maintaining reliable tape winding and unwinding functionality through the controllable speed relationship between drum and reel.
Solution Approach 2:
The controllable reel shaft drive mechanism serves multiple functions: it enables both feeding and storing operations, replaces the function of multiple one-way clutches, and provides speed differentiation between operations. This universal approach reduces component count while maintaining system versatility.
Data Source
AI summary
In a media storing and feeding device for winding up or rewinding the tapes between reels attached to reel shafts and a drum 120 by torque limiters to feed or store the medium, at the time of feeding the medium, the reel shafts are rotated at a speed faster than a speed at which the drum rewinds the tapes, and at the time of storing the medium, the reel shafts are rotated at a speed slower than a speed at which the drum winds up the tapes. A difference between the rotational speeds of the reel shafts and the reels is absorbed by the torque limiters. The media storing and feeding device is thus implemented by inexpensive torque limiters which operate at low speed in place of expensive torque limiters supporting high speed.