Facsimile Switching Unit for Reverse Connection Correction
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Solution Overview
Problem
Facsimiles malfunction when an external device and line cord are reversely connected to the line terminal and external device terminal, causing confusion and improper operation.
Innovation Solution
A facsimile with a switching unit and controller that detects voltage levels on signal lines to determine connection states and switches paths to correct the connection, allowing the external device to function correctly through the line cord.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the line terminal and external device terminal are provided for fixed connection with line cord and external device respectively, then the connection structure is simple and clear, but reverse connection causes malfunction and user confusion
Solution Approach 1:
The controller performs preliminary detection of connection states before operation begins. By detecting voltage levels on signal lines and determining whether reverse connection has occurred, the system prepares the switching unit in advance to correct the connection, preventing malfunction before it happens.
Solution Approach 2:
The switching unit acts as an intermediary between the terminals and the internal circuitry. It mediates the connection by dynamically routing signal lines to the correct terminals based on detection results, allowing the system to adapt to reverse connections without requiring physical reconfiguration by the user.
2Measurement precision
If voltage detection is performed on both signal lines to determine connection state, then connection accuracy is improved, but detection complexity and energy consumption increase
Solution Approach 1:
The voltage detection mechanism serves multiple functions: it detects both the presence and type of connection (line cord vs. external device) on both terminals. By universally applying voltage detection to both signal lines, the system can accurately determine connection states and identify reverse connections without requiring separate detection mechanisms.
3Adaptability or versatility
If the switching unit interchanges signal line paths to correct reverse connection, then system adaptability is improved, but control complexity increases
Solution Approach 1:
When reverse connection is detected, the switching unit inverts the normal signal routing paths. Instead of routing signals from line terminal to line cord and from external device terminal to external device, the switching unit reverses the paths to correctly connect the line cord to the external device terminal and the external device to the line terminal, thereby correcting the reverse connection automatically.
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 proper transmission and reception of facsimile data and use of the external device by correcting reverse connections, ensuring smooth communication and operation.
Implementation Method 1
a signal line voltage detection unit to detect a voltage on the first signal line and a voltage on the second signal line
Data Source
AI summary
A facsimile, a method of controlling the same, and an image forming apparatus having a facsimile function are provided. The facsimile includes a line terminal provided for connection with a line cord and connected with a first signal line, an external device terminal provided for connection with an external device and connected with a second signal line, a switching unit to perform switching between the first signal line and the second signal line, and a controller to determine a connection state between the line terminal and the line cord and a connection state between the external device terminal and the external device, and to, when the external device and the line cord are reversely connected respectively to the line terminal and the external device terminal, control the switching unit to interchange a path of the first signal line and a path of the second signal line.