Toner Cooling Sensor Placement for Tandem Printer Energy Reduction
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Solution Overview
Problem
In electrophotographic image forming apparatuses, the existing cooling systems increase running costs and energy waste due to the need for multiple temperature sensors to manage cooling and developer discharge, especially in tandem color systems where temperature differences between developing units and photosensitive bodies are significant, making it difficult to accurately measure and control temperatures.
Innovation Solution
An image forming apparatus with a dual-image forming section structure, where each section includes a rotatable image bearing body, a developing unit with a temperature sensor on its external wall, a cleaning unit, and a cooling unit using airflow for internal cooling, along with a controller that manages cooling and developer discharge operations based on temperature data from both sections, allowing for efficient temperature control without increasing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a temperature sensor is provided in the developing unit to control cooling operation, then energy saving and noise reduction are improved, but the temperature of the photosensitive body cannot be measured requiring additional sensors
Solution Approach 1:
The temperature sensor mounted on the developing unit housing is designed to measure both the developer temperature inside the developing unit and the photosensitive body temperature in the adjacent image forming section. This multi-functional sensor eliminates the need for separate temperature sensors in each location, reducing device complexity while maintaining energy-efficient cooling control.
Solution Approach 2:
The developing unit housing acts as an intermediary thermal medium between the developer and the photosensitive body. By mounting the temperature sensor on the housing, the system indirectly measures temperatures in both locations through this intermediary structure, avoiding the need for direct sensor placement in both areas.
2Reliability
If cooling operation is performed to prevent developer deterioration and photosensitive body temperature rise, then image quality is maintained, but running cost and energy waste increase
Solution Approach 1:
The control unit continuously monitors temperatures in both the developing unit and image forming section using the temperature sensor, and dynamically adjusts the cooling fan operation accordingly. This feedback mechanism ensures cooling is applied only when and where needed to maintain image quality, minimizing unnecessary energy consumption.
Solution Approach 2:
The cooling fan operation is made dynamic rather than static, with the control unit adjusting fan speed and operation timing based on real-time temperature conditions in both the developing unit and image forming section. This dynamic control optimizes the balance between maintaining image quality and reducing energy consumption.
3Object-affected harmful factors
If cooling is performed around the photosensitive body to suppress temperature rise, then toner melting is prevented, but noise and energy waste increase due to continuous cooling operation
Solution Approach 1:
The control unit uses temperature feedback from the image forming section to activate cooling only when the photosensitive body temperature approaches levels that could cause toner melting. This feedback-based control prevents continuous cooling operation, thereby reducing noise while still preventing toner melting when necessary.
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 enables efficient cooling and developer management across all image forming sections, reducing energy consumption and waste while maintaining image quality, by using a single temperature sensor to monitor and control both developing unit and photosensitive body temperatures, thus optimizing airflow cooling and developer discharge.
Implementation Method 1
a cooling unit for cooling the inside of an apparatus main body with airflow
Implementation Method 2
a temperature sensor provided on an external wall of the developing unit... capable of running a mode for controlling both an operation of the cooling unit and the developer discharging operation in each image forming section based on the detection results of each of the temperature sensors
Data Source
AI summary
In an image forming apparatus, a first cooling unit sends airflow to cool a first developing unit, and a second cooling unit sends airflow to cool a second developing unit. A control section controls the first and second cooling units in a first mode where image formation is executed using both a first and second image forming section, and in a second mode where image formation is executed such that the first developing unit is suspended but the first image bearing body is driven, using an image forming section. In the first mode the first cooling unit is controlled based on an output of a first temperature sensor regardless of a temperature detected by a second temperature sensor, and in the second mode the first cooling unit is controlled based on an output of the second temperature sensor regardless of a temperature detected by the first temperature sensor.