Movable Shielding Unit for Non-Contact Heater Heat Suppression
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Solution Overview
Problem
Image forming apparatuses face challenges in suppressing heating by non-contact type heating means when power is cut off, leading to continued heat transfer and potential overheating of components.
Innovation Solution
An image forming apparatus with a shielding unit that can be manually or automatically switched between open and closed states to control heat transfer, using a shielding unit and an open state forming unit to manage the heating unit's operation and prevent heat release when power is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shielding unit is configured to automatically close when power is cut off, then safety is improved by preventing overheating, but the device complexity increases due to the need for power-dependent control mechanisms
Solution Approach 1:
The shielding unit is pre-configured with a biasing mechanism (spring or gravity) that automatically activates the closed state when power is removed. The control mechanism is designed in advance to default to the safe closed position, preventing overheating without requiring active power-dependent control during normal operation.
Solution Approach 2:
The shielding unit utilizes its own weight or spring force to automatically close when power is cut off, without requiring external control systems. The system serves itself by using the absence of power as the trigger for the protective action, eliminating the need for complex power-dependent control mechanisms.
2Productivity
If the shielding unit remains open during operation to allow heating, then heating efficiency is improved, but the risk of overheating increases when power is unexpectedly cut off
Solution Approach 1:
The shielding unit transitions from a static fixed position to a dynamic movable position, allowing it to adapt between open (heating) and closed (safety) states. The movable configuration enables real-time adjustment based on operational requirements and power status, resolving the contradiction between heating efficiency and safety.
Solution Approach 2:
The system changes the state parameter of the shielding unit from fixed to variable, allowing it to switch between open and closed positions. This parameter change enables the system to optimize heating efficiency during operation while preventing overheating when power is cut off.
3Temperature
If a movable shielding unit is introduced to control heat release, then temperature control is improved, but the device complexity increases due to additional moving parts
Solution Approach 1:
The movable shielding unit utilizes its own weight or spring force to automatically move between open and closed positions, without requiring external actuators or complex control systems. The system serves itself by using gravity or elastic force as the driving mechanism, achieving temperature control while minimizing added complexity.
Solution Approach 2:
The patent replaces complex powered control systems with simple mechanical mechanisms such as gravity-based movement or spring-loaded actuators. This substitution achieves the desired temperature control functionality while significantly reducing device complexity compared to electrically actuated systems.
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
Effectively suppresses heating of the image forming and fixing units by shielding the heating unit when power is cut off, preventing heat transfer and reducing the risk of overheating, thereby maintaining operational safety and efficiency.
Implementation Method 1
a heating unit that is provided on a downstream side in a transport path from the image forming unit and that is configured to heat a medium being transported in a non-contact manner
Implementation Method 2
a shielding unit to which force is applied so as to be in a closed state in which the heating unit is shielded
Data Source
AI summary
An image forming apparatus, includes: an image forming unit that forms a toner image on a medium; a heating unit that is provided on a downstream side in a transport path from the image forming unit and that is configured to heat a medium being transported in a non-contact manner; a fixing unit that is provided on a downstream side in the transport path from the heating unit and fixes the toner image on the medium; a shielding unit to which force is applied so as to be inform a closed state in which the heating unit is shielded; and an open state forming unit configured to receive power supply to drive the shielding unit so as to form an open state in which the heating unit is opened, and maintain the open state while the power is being supplied.