Fuser Sensor Loopback Wire for Connection Failure Prevention
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Solution Overview
Problem
The existing fuser devices in electrophotographic image forming apparatuses face malfunctions due to connection failures between the sensor and protection units, leading to repeated power cycling and overheating, which causes the protection unit to continuously operate, potentially resulting in device failure.
Innovation Solution
A fuser device design where the sensor unit and protection unit are independently connected through intermediate connectors and a loopback wire, ensuring that if the sensor unit connection fails, the power supply to the heater unit is continuously cut off, preventing overheating and malfunctions, even if the protection unit connection remains secure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensor unit and protection unit are independently manufactured with separate connectors, then the manufacturing flexibility and independence are improved, but the connection reliability deteriorates due to potential connection failures
Solution Approach 1:
The device is divided into independent sensor unit and protection unit, each with separate connectors, allowing independent manufacturing while maintaining functional separation. This segmentation enables flexible assembly and manufacturing processes.
Solution Approach 2:
A loopback wire is pre-installed in the sensor unit connector to create a backup connection path. If the sensor unit connector fails, the loopback wire automatically provides an alternative electrical connection, preventing complete system failure and ensuring the protection unit remains functional.
2Adaptability or versatility
If the connector is disconnected to allow independent manufacturing, then the manufacturing independence is improved, but the temperature detection reliability deteriorates due to connection failures
Solution Approach 1:
The loopback wire serves as a pre-prepared backup that activates automatically upon connector failure, ensuring continuous temperature monitoring capability even when the primary connection path is compromised.
Solution Approach 2:
The loopback wire acts as an intermediary element that provides an alternative electrical connection path between the sensor unit and protection unit, mediating the connection failure and maintaining system functionality.
3Reliability
If the sensor unit connection fails but protection unit remains connected, then the protection unit connection reliability is maintained, but the heater unit overheating risk increases due to repeated power cycling
Solution Approach 1:
The loopback wire provides a pre-established backup connection that activates when the sensor unit connector fails, ensuring the protection unit receives continuous temperature signals and can prevent overheating without repeated power cycling.
Solution Approach 2:
The thermal cutoff receives continuous temperature feedback through the loopback wire connection path, enabling it to monitor heater unit temperature and cut off power when overheating is detected, preventing harmful effects even when the primary sensor connection fails.
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 design effectively prevents malfunctions caused by sensor unit connection failures by ensuring continuous power cutoff to the heater unit, thereby maintaining device stability and preventing overheating, even when the sensor unit connection is lost.
Implementation Method 1
a thermal cutoff that cuts off a circuit in accordance with temperature at a predetermined position
Implementation Method 2
a sensor unit that includes a sensor for detecting temperature at a predetermined position
Data Source
Figure 1
AI summary
A sensor unit (12) includes a thermistor (21) and a connector (22). A protection unit (13) includes a thermal cutoff (31) and a connector (32). An intermediate connector unit (14-1, 14-2) electrically connects the connectors (22, 32) and an external connection connector (11) to each other, respectively. An intermediate wire (53) electrically connects the intermediate connectors (14-1, 14-2) to each other. The first intermediate connector unit (14-1) electrically connects an end of a loopback wire (23) of the connector (22) to the external connection connector (11), the second intermediate connector unit (14-2) connects an end of the thermal cutoff (31) to the external connection connector (11), the intermediate wire (53) electrically connects the other end of the loopback wire (23) and the other end of the thermal cutoff (31) to each other.