Fixing Belt Temperature Control for Continuous Paper
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Solution Overview
Problem
Conventional fixing units face issues with damage and quality degradation when processing continuous paper, particularly resin-based papers, due to prolonged exposure to heat, leading to severe damage and output quality degradation, and existing solutions complicate the system with additional mechanisms to mitigate these issues.
Innovation Solution
A fixing apparatus with a temperature control system that adjusts the temperature of a heated roller or endless belt to a standby temperature lower than the melting point of the paper, preventing damage and quality degradation by maintaining the temperature below the threshold that causes issues during idle states, and adjusts rotational speeds and nipping pressure to ensure effective fixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heated roller is maintained at a high temperature (e.g., 180°C) in standby state to improve productivity, then productivity is improved, but severe damage occurs to resin-based continuous paper and quality degradation occurs
Solution Approach 1:
The patent applies dynamics by making the temperature of the heated roller variable rather than fixed. The temperature is dynamically adjusted based on the operational state: maintained at a high first temperature (e.g., 180°C) during fixing operations to ensure proper toner fixation and productivity, and reduced to a lower second temperature during standby states to prevent paper damage. This dynamic temperature control resolves the contradiction between maintaining high productivity and preventing harmful effects on paper.
2Object-affected harmful factors
If a mechanism is added to separate rollers and retract continuous paper from the heated roller in standby state to prevent damage, then paper damage is prevented, but device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by modifying the temperature parameter of the heated roller based on operational conditions. Instead of adding mechanical separation mechanisms, the system changes the thermal parameter dynamically: maintaining high temperature during active fixing operations and reducing to low temperature during standby states. This parameter-based solution prevents paper damage while avoiding the complexity and cost associated with mechanical separation 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
Prevents severe damage to the fixing apparatus and maintains output quality by inhibiting paper trouble during standby states without the need for complex mechanisms, reducing system costs and complexity, while ensuring effective fixing of toner images on continuous paper.
Implementation Method 1
a heating unit configured to heat a heated object which is either a roller or an endless belt stretched around a plurality of rollers
Implementation Method 2
fix an unfixed toner image formed on a continuous paper to the continuous paper by heat from the heated object under a nipping pressure applied at the nip portion
Implementation Method 3
the control unit controls the temperature of the heated object to be a stand-by temperature lower than such a first temperature, which is set up in advance, that paper trouble might occur
Data Source
AI summary
A fixing apparatus includes a heating unit configured to heat an endless belt stretched around a plurality of rollers, a lower pressure roller pressed into contact with the fixing belt, and a control unit configured to control the temperature of the fixing belt by controlling the heating unit, and fixes an unfixed toner image formed on a continuous paper to the continuous paper by heat from the heated object under a nipping pressure applied at the nip portion which is formed by engagement between the fixing belt and the lower pressure roller. The control unit controls the temperature of the fixing belt to be a stand-by temperature lower than such a first temperature, which is set up in advance, that paper trouble might occur if the continuous paper is continuously heated at a temperature not lower than the first temperature in a stand-by state in which fixing is not performed.