Capstan Tensioning Mechanism for Cable Lacing Tape
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Solution Overview
Problem
Existing methods for tensioning cable lacing tapes are labor-intensive and time-consuming, and existing automated devices often require complex mechanisms that are difficult to operate effectively, especially with tapes coated with materials like aramid fiber that are slippery and hard to grip.
Innovation Solution
A manual apparatus with a capstan assembly and tensioning mechanism that uses a gear system and coil spring to apply tension to the cable lacing tape, allowing for secure wrapping and optional cutting of the tape once the predetermined tension is reached, featuring a capstan assembly with inner and outer capstans that pinch the tape to prevent withdrawal and build tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated knot-tying devices are used to tension cable lacing tape, then productivity is improved, but device complexity increases due to complicated wrapping and tying mechanisms
Solution Approach 1:
The patent extracts the essential tensioning function from complex automated knot-tying devices. Instead of implementing full automated wrapping and tying mechanisms, the invention isolates and automates only the tensioning aspect using a capstan assembly with pinch rollers, thereby maintaining productivity benefits while dramatically reducing device complexity.
Solution Approach 2:
The capstan assembly acts as an intermediary mechanism between the tensioning force source and the cable lacing tape. The pinch rollers on the capstan provide the necessary gripping action on slippery tapes through rotational motion, serving as a mediator that simplifies the overall system while achieving effective tensioning.
2Device complexity
If traditional hand-tying methods are used for cable lacing tape, then device complexity is minimized, but productivity decreases due to labor-intensive processes
Solution Approach 1:
The capstan assembly with pinch rollers is designed to automatically grip and tension the cable lacing tape through its rotational mechanism. The system serves itself by using the rotational motion to naturally pinch and tension the tape without requiring complex control systems or multiple moving parts, thereby maintaining simplicity while improving productivity.
3Productivity
If automated tensioning devices are used, then productivity is improved, but ease of operation worsens due to difficulty in gripping slippery tapes with aramid fiber coatings
Solution Approach 1:
The capstan assembly uses curved, rotational surfaces instead of flat gripping surfaces. The cylindrical capstan with rotating pinch rollers creates continuous curved contact with the slippery cable lacing tape, allowing friction-based gripping to work effectively on aramid fiber coatings that are difficult to grip with traditional linear mechanisms.
Solution Approach 2:
The system uses dynamic rotational motion of the capstan and pinch rollers to create and maintain gripping force on the slippery tape. Rather than relying on static friction from fixed grippers, the rotating mechanism dynamically engages and maintains contact, significantly improving ease of operation with difficult-to-grip materials.
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 apparatus efficiently tensions the cable lacing tape to a predetermined level and cuts the excess, providing a secure and consistent pinching action that overcomes the challenges of gripping slippery tapes, reducing manual labor and complexity in the process.
Implementation Method 1
a tensioning mechanism that uses a gear system and coil spring to apply tension to the cable lacing tape
Implementation Method 2
a capstan assembly with inner and outer capstans that pinch the tape to prevent withdrawal and build tension
Data Source
AI summary
An apparatus for tensioning a cable tape comprises a housing, a drive assembly, a capstan, and an optional cutting device. The drive assembly includes a driving member and a driven member slidably coupled to the driving member. A biasing element is coupled between the driving and the driven member and in a first operating mode, the driving member causes movement of the driven member little or no relative movement between two members. The capstan is rotatably coupled to the housing, and includes a gripping device to grip a cable tape and wrap the cable tape around an outer surface of the capstan as the capstan rotates. In a second operating mode, a tension force applied on the capstan by the cable tape that is greater than the biasing force allows relative movement between the driving member and the driven member.