Shield Wire Foil Stripping Using Pneumatic Expansion Cutting
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Solution Overview
Problem
Existing methods for stripping metal foil from shielded electric wires, such as those used in Ethernet cables, are inefficient due to inconsistent expansion of the metal foil, potential damage to the wire core, limited stripping length, and complex structures that increase device costs and operational complexity.
Innovation Solution
A method and device that utilize a peeling jig with an air blowing unit and cutter to expand and cut the metal foil, allowing for reliable stripping without damaging the wire core and eliminating limitations on stripping length, featuring a simple structure with an air blowing unit and cutter integrated into the peeling jig.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conical concave surface is used to expand the metal foil, then the metal foil can be expanded for cutting, but the expansion shape is inconsistent causing unreliable stripping or wire core damage
Solution Approach 1:
The patent replaces the mechanical conical concave surface expansion method with a pneumatic expansion system. Compressed air is introduced through a nozzle positioned near the metal foil, causing uniform radial expansion of the foil without the inconsistency problems of mechanical expansion. This substitution of mechanical system with pneumatic system resolves the reliability and precision contradiction.
Solution Approach 2:
The patent employs pneumatic pressure through a compressed air nozzle to expand the metal foil uniformly. The air pressure creates consistent radial force distribution across the foil surface, ensuring uniform expansion shape and size. This pneumatic approach directly addresses the inconsistency issue with mechanical expansion while maintaining reliable stripping.
2Productivity
If the distance between the conical concave surface and the chuck is limited, then the structure remains simple, but the stripping length of the metal foil is limited
Solution Approach 1:
The pneumatic expansion system allows the metal foil to be expanded at various positions along its length by simply adjusting the nozzle position and air pressure. This eliminates the need for a fixed limited distance between components, enabling unlimited stripping length while keeping the overall structure simple. The pneumatic system provides flexible control without mechanical complexity.
Solution Approach 2:
The patent introduces dynamic control of the expansion process through adjustable air pressure and nozzle positioning. This dynamic approach allows the expansion to occur at any position along the metal foil, enabling variable stripping lengths without requiring a complex adjustable mechanical structure. The dynamic pneumatic system replaces static mechanical constraints.
3Adaptability or versatility
If a mechanism for changing the distance between the conical concave surface and the chuck is added, then the stripping length can be adjusted, but the structure and operation become complicated and device cost increases
Solution Approach 1:
The pneumatic system provides adaptability for different stripping lengths through simple adjustment of air pressure and nozzle position, without requiring complex mechanical mechanisms. The compressed air can reach different positions along the metal foil, enabling versatile stripping length adjustment while maintaining structural simplicity and low device cost.
4Manufacturing precision
If a cutting blade is brought into contact with the metal foil to cut it, then the metal foil can be stripped, but the wire core may be damaged due to excessive cut or insufficient cut
Solution Approach 1:
The pneumatic expansion creates a controlled, uniform expansion of the metal foil to a precise, consistent size. This controlled expansion ensures that the subsequent cutting operation occurs at the correct position and depth, preventing both insufficient cut and excessive cut that could damage the wire core. The pneumatic system provides the precision control needed for reliable cutting without wire core damage.
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
Enables easy and reliable stripping of metal foil from shielded electric wires without damaging the wire core and without limitations on stripping length, maintaining a simple structure and reducing operational complexity and device costs.
Implementation Method 1
blowing air into the electric wire insertion hole from an opening on an other-end-surface side of the peeling jig toward the distal end of the shielded electric wire, thereby causing the metal foil at the distal end of the shielded electric wire to expand while being separated from the wire core
Data Source
AI summary
Positioning of a shield electric wire is performed by an insertion jig in front of a peeling jig, and a portion at a distal end of the shield electric wire where a metal foil is exposed is inserted into an electric wire insertion hole of a peeling jig through the center hole of an insertion jig. Air is blown from an opening on an other-end-surface side of the peeling jig toward the distal end of the shielded electric wire, and the metal foil is expanded while being separated from a wire core. A cut is formed from a side of a metal foil expanded by blowing air in a predetermined gap between a one-end-surface of the peeling jig and an end surface of the insertion jig, and the metal foil is cut from the cut as a starting point.