Braking Device for Tape Reel with Selective Friction Control
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Solution Overview
Problem
Existing braking devices for rotatably mounted tape reels in the luxury goods industry face issues of damaging the tape edges due to direct friction and lack of precision in generating desired tape tension, with limited capability to produce high braking torques and requiring frequent adjustments for varying reel inertia.
Innovation Solution
A braking device with two rotating members and a selection member that cooperates by friction with either member, allowing for two distinct braking levels: a slowing-down brake for continuous tape tension control and a stopping brake for emergency stoppages, using friction disks and pneumatic actuators to modulate braking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If direct friction braking is applied between flanges and reel sides, then braking torque is generated, but the edges of the tape are damaged
Solution Approach 1:
The patent introduces friction disks as an intermediary element between the braking system and the reel. The friction disks are pressed against the reel's friction surface by a pressing device, transferring the braking force through this intermediary rather than direct flange-to-reel contact. This mediator protects the tape edges from damage while still generating the necessary braking torque through controlled friction at the disk-reel interface.
2Force
If friction between flanges and reel sides is used for braking, then braking action is achieved, but precision in generating desired tape tension is poor
Solution Approach 1:
The patent employs a pressing device with adjustable pressing force that can be precisely controlled to modulate the friction between the friction disks and the reel. By changing the pressing force parameter, the system can generate precise braking torques corresponding to desired tape tensions. The friction surface on the reel is also specifically designed with controlled characteristics to enable precise friction-based torque generation, transforming an imprecise flange-reel friction system into a precise disk-reel friction system through parameter optimization.
3Force
If a braking device with friction disks and adjusting wheel is used, then tape tensioning is achieved, but the device cannot generate high braking torques for emergency stoppage
Solution Approach 1:
The patent creates a dynamic braking system where the friction disks can be selectively positioned relative to the reel. During normal operation, the disks are positioned close to the reel surface for precise tension control with low braking torque. During emergency stoppage, the pressing device can increase the pressing force significantly, or additional friction disks can be engaged, to generate high braking torques for rapid deceleration. This dynamic adaptability allows the same basic structure to serve both precision tensioning and emergency stopping functions.
4Reliability
If braking torque is adjusted for varying reel inertia, then optimal braking is achieved, but frequent adjustment is required
Solution Approach 1:
The patent implements a self-adjusting braking system that automatically adapts to varying reel inertia without requiring manual intervention. As the reel unwinds and its moment of inertia changes, the pressing device or friction disk positioning mechanism automatically adjusts the braking characteristics to maintain optimal performance. This self-service capability eliminates the need for frequent manual adjustments while maintaining reliable braking performance throughout the reel's operational life.
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
The solution provides precise and adjustable braking without damaging the tape, enabling both low and high braking torques as needed, improving tape tension control and emergency stop capabilities while minimizing reel damage.
Implementation Method 1
a selection member arranged to cooperate by friction selectively with either one of the rotating members
Data Source
AI summary
A braking device 1 is provided for a tape reel mounted rotatably about its axis. The braking device 1 includes two rotating members 10, 20 rotationally coupled with the reel, and a selection member 30 configured to cooperate by friction selectively with either one of the rotating members 10, 20 by moving the selection member to engage one or the other rotating member for friction braking.