Shielded Wire End Processing Apparatus Braid Expansion
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Solution Overview
Problem
The existing methods for processing the end portion of a shielded wire, particularly the expansion and folding back of the braid, are unstable and lead to non-uniform expansion, resulting in reduced yield and potential damage to the wire.
Innovation Solution
A method and apparatus that utilize a pair of claw portions with V-shaped edges to expand the braid in stages, with the first pipe fitting onto the inner sheath and the second pipe sliding to fold back the braid, ensuring stable and uniform expansion and folding, reducing errors and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the expansion claws are driven to strike against the braid twice to expand it into a larger size, then the braid expansion size is increased, but the shielded wire is not held by any means during the second striking operation, causing non-uniform expansion and reduced yield
Solution Approach 1:
The distal end of the shielded wire is held by the claw portions before the second striking operation begins. This preliminary holding action prevents the wire from moving or bending during expansion, ensuring uniform braid expansion while achieving the required expansion size.
Solution Approach 2:
The claw portions serve as an intermediary holding mechanism between the expansion claws and the shielded wire. By introducing this intermediate holding function, the system achieves both large expansion size and uniform expansion without direct conflict between the two requirements.
2Ease of operation
If the braid is expanded into a larger size before folding back, then the folding back process becomes more difficult, but not expanding it sufficiently makes folding back unstable
Solution Approach 1:
The braid is pre-expanded to an optimal size before the folding back operation. This preliminary expansion creates the necessary slack and flexibility for easy folding while maintaining sufficient structural integrity for stable folding back. The holding mechanism ensures this expansion is achieved uniformly.
Solution Approach 2:
The braid expansion parameters (size, uniformity) are optimized to a specific range that balances folding ease and folding stability. By controlling the expansion to neither too small nor too large, both operational ease and reliability are achieved simultaneously.
Data Source
AI summary
An end portion processing apparatus for processing an end portion of a shielded wire in which part of an outer sheath has been removed such that an exposed braid disposed between an inner sheath and the outer sheath extends from a distal end of the outer sheath, includes a wire clamp portion which positions the end portion of the shielded wire in an open condition of the wire clamp portion, and clamps the end portion of the shielded wire, a pair of claw portions which strikes against the exposed braid radially thereof at the clamped end portion of the shielded wire to expand the end portion of the braid, a first pipe portion which is disposed in a standby position on a line of extension of the clamped end portion of the shielded wire, and is fitted onto an outer periphery of the inner sheath, a second pipe portion which is provided on an outer periphery of the first pipe portion in concentric relation thereto, and is slid toward the shielded wire to fold back the expanded braid on the outer sheath, and a control portion which controls the operations of the claw portions, the first pipe portion and the second pipe portion.