Wire Stripper Impedance Detection for Shielded Cable Core Contact
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Solution Overview
Problem
Existing wire strippers face challenges in accurately detecting contact between stripping blades and the wire core, especially when the wire is short, due to signal attenuation and noise interference, which can lead to inaccurate detection and potential safety issues.
Innovation Solution
A wire stripper configuration that uses a signal applying means to match the signal level between the center conductor and the shielding material, reducing current leakage and signal attenuation, allowing for precise detection of wire core scratches regardless of wire length using the stripping blades as a detection sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stripping blades are fed into the wire coating deeply to make a precise cutting edge, then the coating stripping precision is improved, but the wire core may be scratched or cut off resulting in rejection
Solution Approach 1:
The patent applies preliminary action by detecting the impedance of the wire core before the stripping blades contact it. The detection sensor measures the electrical impedance characteristics of the core wire in advance, allowing the system to adjust cutting parameters or alert operators before actual stripping occurs, thereby preventing scratches or cuts to the core while maintaining precise coating removal
Solution Approach 2:
The patent implements feedback through a detection sensor that continuously monitors the impedance of the wire core during the stripping process. When the impedance changes indicate approaching contact between the blades and core, the system provides feedback signals to control the depth or speed of blade insertion, dynamically adjusting the process to maintain precision while preventing core damage
2Extent of automation
If electrodes are allocated to detect contact between wire core and blade through electric conduction, then contact detection function is achieved, but the detection accuracy deteriorates when the electric wire is cut short due to signal attenuation
Solution Approach 1:
The patent replaces the conventional electrical conduction-based detection system with an impedance-based detection method. Instead of relying on electrical contact between separate electrodes and the wire core, the system uses a detection sensor to measure the electrical impedance of the core wire itself, which remains effective regardless of wire length or signal attenuation issues
Solution Approach 2:
The detection sensor serves multiple functions: it detects the impedance of the wire core, determines contact between the stripping blades and core, and provides signals for process control. This multi-functional approach eliminates the need for separate detection electrodes and maintains accuracy across different wire lengths
3Measurement precision
If the wire core impedance is detected to determine contact between stripping blades and wire core, then detection precision is improved, but signal attenuation and noise interference occur especially for short wires
Solution Approach 1:
The patent introduces an intermediary approach by using impedance detection as a mediator between the physical contact event and the electrical signal measurement. The impedance measurement acts as an intermediate parameter that is less susceptible to signal attenuation and noise than direct electrical conduction measurements, enabling accurate detection even with short wires
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
This configuration enhances detection precision and accuracy by eliminating signal attenuation and noise interference, enabling reliable contact determination between stripping blades and the wire core, even for short wires, thus preventing unnecessary operation stops and ensuring wire quality.
Implementation Method 1
uses a cutter (stripping blades) as a detection sensor to detect an impedance (including resistance, inductance, and capacitance) of a wire core of an electric wire
Implementation Method 2
a center conductor (signal line) that transmits an electric signal from the signal generating circuit to the stripping blades
Implementation Method 3
a capacitance between the center conductor (signal line) and the shielding material of the shielded wire, current leakage occurs between these, and thus attenuation of the electric signal takes place
Data Source
AI summary
A wire stripper detects contact between a core wire of an electric wire and stripping blades and detects if the electric wire is cut short. The wire stripper includes a signal analyzer circuit that measures an impedance through the stripping blades for a change in the impedance caused by contact with the wire core and a buffer circuit, that when a contact of the stripping blades with the wire core is detected, applies a signal having the same level as that of an electric signal applied to the stripping blades to a side of a shielding material of a shielded cable for transmitting the electric signal to and from the stripping blades so as to reduce or prevent current leakage between a signal line of the shielded cable and the shielding material.