Dynamic Pre-Rotation Time Control for Printing Apparatus FPOT
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Solution Overview
Problem
Current image forming apparatuses face challenges in reducing First Page Out Time (FPOT) while minimizing fixing defects, as simply reducing pre-rotation time can lead to insufficient fixing temperatures.
Innovation Solution
A printing apparatus that calculates the printing rate based on print data to adjust pre-processing time, optimizing temperature adjustment control and reducing fixing defects by changing pre-rotation time accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pre-rotation time is reduced to shorten FPOT, then productivity is improved, but fixing temperature becomes insufficient causing fixing defects
Solution Approach 1:
The patent applies dynamics by making the pre-rotation time adjustable rather than fixed. The control unit dynamically changes the pre-rotation time based on the printing rate calculated from print data, allowing the system to adapt between short pre-rotation for low printing rates and long pre-rotation for high printing rates, thus resolving the contradiction between productivity and fixing quality
Solution Approach 2:
The patent changes the parameter of pre-rotation time based on the printing rate. By calculating the printing rate from print data and adjusting the pre-rotation time accordingly, the system optimizes both FPOT and fixing temperature, preventing fixing defects while maintaining productivity
2Reliability
If pre-rotation time is extended to ensure sufficient fixing temperature, then fixing quality is improved, but FPOT increases reducing productivity
Solution Approach 1:
The system dynamically adjusts pre-rotation time based on actual printing conditions. For low printing rates, shorter pre-rotation is sufficient maintaining productivity. For high printing rates, longer pre-rotation ensures fixing quality. This dynamic adjustment resolves the contradiction by matching pre-rotation time to actual needs
Solution Approach 2:
The patent changes the pre-rotation time parameter according to the printing rate calculated from print data. This parameter adjustment allows the system to use minimum necessary pre-rotation time for each printing condition, optimizing both fixing quality and productivity
3Ease of operation
If same pre-rotation time is set for all print data types, then control simplicity is maintained, but FPOT cannot be optimized for different printing rates
Solution Approach 1:
The system performs self-service by automatically calculating the printing rate from the print data and autonomously determining the appropriate pre-rotation time. This eliminates the need for manual intervention or complex user settings, maintaining ease of operation while achieving optimized FPOT for different printing scenarios
Solution Approach 2:
The control unit calculates the printing rate from print data and uses this feedback to adjust the pre-rotation time. This feedback mechanism enables automatic optimization of FPOT based on actual printing requirements without complicating the user interface or operation
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 approach allows for a more efficient reduction in FPOT while minimizing fixing defects by setting appropriate pre-processing times based on printing rates, ensuring optimal temperature adjustment and improved print processing.
Implementation Method 1
This process heats the toner image to fix it onto the recording material as an image
Implementation Method 2
a rotatable endless heat-resistance thin flexible member is slidingly moved toward a heating member to apply the heat of the heating member to the recording material through the flexible member
Data Source
AI summary
A printing apparatus sets, as time for performing pre-processing before performing print processing, first time if the printing rate calculated by the calculation unit is smaller than a predetermined value, and second time that is longer than the first time if the printing rate calculated by the calculation unit is larger than the predetermined value.