Developing Device Cooling via Integrated Airflow Ducts
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Solution Overview
Problem
Existing image forming apparatuses using electrophotography face issues with developer temperature rise due to friction, which leads to agglomeration and degradation, and current cooling methods either inadequately address the problem or require multiple cooling units, increasing size and cost.
Innovation Solution
An image forming apparatus with built-in rotary drive members, a developing device, and a duct system that directs airflow from a blast or exhaust fan to cool both the developer driving parts and the developer case, effectively reducing temperature rise by circulating air through the driving units and developer case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple cooling units are provided at front and back sides of the developing device to cool both the developer case and driving part, then the cooling effectiveness is improved, but the size of the apparatus and cost increase
Solution Approach 1:
The patent combines the cooling of the developer case and the driving part into a single integrated cooling unit. The cooling unit includes a cooling fan and a heat dissipation structure that simultaneously cools both the developer case and the driving part (gears, shafts, bearings) through a unified design, eliminating the need for separate cooling units at the front and back sides.
Solution Approach 2:
The cooling unit is designed to perform multiple functions: it cools the developer case, cools the driving part components (gears, shafts, bearings), and dissipates heat generated during development. This multi-functional design allows a single cooling unit to replace what would otherwise require multiple separate cooling systems.
2Temperature
If cooling air is blown onto the developer from the side of the developer unit, then the developer temperature is reduced, but the driving part heat is not addressed
Solution Approach 1:
The cooling unit integrates cooling pathways that direct cooling air to both the developer case and the driving part components. The heat dissipation structure is designed to channel cooling air through both regions simultaneously, ensuring that both the developer and the driving part (gears, shafts, bearings) are cooled by the same cooling system.
3Device complexity
If heat from driving units is transmitted via screw shaft or case to the developer, then the structure is simple, but the developer temperature increases causing agglomeration and degradation
Solution Approach 1:
The patent converts the heat-generating driving part into a heat dissipation source that actively cools the developer. The driving part is equipped with cooling fins or heat dissipation structures that radiate heat away from the developer, transforming the previously harmful heat transmission into a beneficial cooling effect. The driving part becomes an active component in the thermal management system rather than a passive heat source.
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 solution efficiently cools the developer and driving units, reducing temperature and preventing agglomeration, while maintaining a compact design by integrating cooling functions within the apparatus.
Implementation Method 1
a duct system that directs airflow from a blast or exhaust fan to cool both the developer driving parts and the developer case, effectively reducing temperature rise by circulating air through the driving units and developer case
Implementation Method 2
cooling air through the driving units and developer case... efficiently cools the developer and driving units, reducing temperature
Data Source
Figure 1
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AI summary
An image forming apparatus comprising: a built-in rotary driving member (11, 12); a developing device (IO) detachably attachable to the body of the image forming apparatus (1); a developer driving part (30) disposed at one end in a shaft direction of the developing roller (11) and the agitation screw (12); a driving part duct (36) enveloping the developer driving part (30) of the developing device (10); a developer case surface duct (41) formed along a surface parallel to the shaft direction of the developing roller (11) and the agitation screw (12); and a blast fan (40) or an exhaust fan (43) to blow air from either the driving part duct (36) or the developer case surface duct (41) to each other.