Shield Foil Slitting for Twisted Wire Core Terminal Processing
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Solution Overview
Problem
Existing methods for removing shield foils from shielded electric wires, particularly those with multiple twisted wire cores, face challenges in achieving accurate and consistent cutting without damaging the wire cores, especially when the shield foil expands irregularly, leading to issues with dimensional accuracy and quality.
Innovation Solution
A method involving a sheath removal step, wire core untwisting, foil compression using an opening and closing chuck to create a rectangular space, and precise cutting with a cutter to make slits in the shield foil along the wire cores' longitudinal direction, followed by peeling, ensures accurate and stable removal without damaging the wire cores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shield foil is removed manually after insulating sheath removal, then the work can be performed with simple equipment, but the dimensional accuracy and quality deteriorate and the work becomes troublesome
Solution Approach 1:
The patent replaces manual mechanical operations with an automated mechanical system consisting of a chuck, conical concave surface, and cutting blade. The system uses controlled mechanical expansion against the conical surface to uniformly separate the shield foil from wire cores, followed by automated cutting, eliminating manual manipulation while ensuring consistent dimensional accuracy.
Solution Approach 2:
The patent changes the physical state and geometry parameters of the shield foil through controlled expansion. By pressing the expanded end against a conical concave surface, the shield foil transitions from a compact wound state to an expanded state with increased radial dimension, creating a gap between the foil and wire cores that enables precise cutting without manual handling.
2Extent of automation
If the shield foil is expanded by pressing against a conical concave surface, then the shield foil can be cut automatically, but the expanded shape is not necessarily constant leading to insufficient or excessive cutting
Solution Approach 1:
The patent performs preliminary expansion of the shield foil to a controlled, repeatable degree before cutting. The chuck expands the shield foil to a predetermined extent, and the expanded end is pressed against the conical concave surface to establish a consistent initial shape. This preliminary action ensures that subsequent cutting operations start from the same geometric state, enabling precise and consistent results.
Solution Approach 2:
The conical concave surface acts as a template or master form that defines the target geometry for the expanded shield foil. By pressing the expanded shield foil against this fixed conical surface, the system copies the precise geometric characteristics of the concave surface onto the shield foil, ensuring consistent and repeatable expansion shapes across multiple operations.
3Ease of operation
If the shield foil is cut while the wire cores are twisted, then the cutting process is simpler, but the shield foil expands in irregular shape making accurate cutting difficult
Solution Approach 1:
The patent performs untwisting of the wire cores as a preliminary action before the cutting operation. The chuck expands the shield foil and simultaneously untwists the wire cores, straightening them into a parallel arrangement. This preliminary straightening creates a regular, predictable geometry for the shield foil-wire core assembly, enabling accurate cutting while maintaining process simplicity.
Data Source
AI summary
A shield foil removing device includes an opening and closing chuck configured to accommodate two wire cores surrounded by a shield foil in a space having a rectangular cross section orthogonal to an electric wire longitudinal direction, which is formed by closing, in such a direction that a longitudinal direction of the rectangular space and an arrangement direction of the two wire cores in a cross section coincide with each other, compresses the shield foil in a direction orthogonal to an arrangement direction of the two wire cores by reducing the rectangular space by a closing operation, and brings the shield foil into close contact with outer peripheral surfaces of the two wire cores to secure a gap continuous in a longitudinal direction of the shielded electric wire between both of outer peripheral curved surfaces adjacent to each other of the two wire cores and the shield foil.