Fuser Cooling Control for Non-Paper Passing Area Overheating
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Solution Overview
Problem
The non-paper passing area of the fusing nip in a printing apparatus tends to overheat, which can lead to thermal damage and reduce the lifetime of the fuser and affect other elements of the printing apparatus, especially when smaller print media are used.
Innovation Solution
A ventilation device is used to supply cooling air to the non-paper passing area of the fusing member, controlled by temperature sensors that detect overheating in this area, ensuring efficient cooling without interfering with the temperature detection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fusing area is made larger than the print medium width, then the fuser can accommodate different print medium sizes, but the non-paper passing area overheats and reduces fuser lifetime
Solution Approach 1:
The fusing area is divided into a paper passing area and a non-paper passing area, with independent temperature control for each region. Temperature sensors are separately positioned to detect temperatures in both areas, allowing the system to manage heat distribution segmentally and prevent overheating in the non-paper passing area while maintaining proper temperature in the paper passing area.
Solution Approach 2:
Different regions of the fusing area are given different thermal characteristics. The paper passing area maintains high temperature for effective fusing, while the non-paper passing area is equipped with independent cooling control to prevent overheating. This local differentiation allows the fuser to accommodate various print medium sizes without compromising reliability.
2Measurement precision
If temperature sensors are placed to detect fusing area temperature, then the temperature can be controlled for proper fusing, but the sensors may be affected by cooling air and give inaccurate readings
Solution Approach 1:
Temperature sensors are segmented and positioned in specific locations - one sensor detects temperature in the paper passing area while another detects temperature in the non-paper passing area. This segmentation allows accurate temperature measurement in each region without mutual interference from cooling air flows targeted at different areas.
Solution Approach 2:
The system uses strategically positioned temperature sensors as intermediaries to indirectly monitor fusing conditions without being directly exposed to cooling air streams. The sensors detect thermal conditions in their respective zones, providing accurate data for control decisions without being contaminated by cooling air interference.
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
Prevents overheating of the non-paper passing area, thereby extending the fuser's lifetime and maintaining optimal printing performance by reducing thermal stress on adjacent components.
Implementation Method 1
a ventilation device configured to supply air to the fusing member in a width direction
Data Source
AI summary
A printing apparatus can include a fuser including a fusing member, a heater configured to heat the fusing member, and a pressure member configured to form, together with the fusing member, a fusing nip through which the print medium passes, a ventilation device to supply air to the fusing member in a width direction, a first temperature sensor configured to detect a temperature of a non-paper passing area of the pressure member, a controller configured to control the ventilation device based on the temperature detected by the first temperature sensor.