Image Forming Apparatus Cleaning Mode Based on Simplex Duplex Integration
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Solution Overview
Problem
Electrophotographic image forming apparatuses face downtime due to unnecessary cleaning of the pressure roller when operated in two-sided printing mode, as the existing timing-based cleaning sequences for single-sided prints lead to excessive cleaning and interrupt printing operations.
Innovation Solution
An image forming apparatus that integrates the number of simplex and duplex mode operations to determine optimal cleaning timing, using a toner image forming and fixing process to clean the pressure roller, with a notification system to inform users when cleaning is necessary, thereby reducing downtime and improving operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cleaning sequence is automatically carried out based on the number of single-sided prints, then the pressure roller is cleaned to maintain image quality, but the apparatus experiences excessive downtime due to unnecessary cleaning when operating in two-sided printing mode
Solution Approach 1:
The cleaning determination unit dynamically adjusts the cleaning timing based on the operating mode (simplex or duplex) by integrating operation counts differently for each mode. In duplex mode, the system recognizes that the pressure roller is naturally cleaned during normal operation and suppresses unnecessary cleaning sequences, while in simplex mode it maintains regular cleaning schedules. This dynamic adaptation resolves the contradiction between maintaining image quality and ensuring printing continuity.
Solution Approach 2:
The system changes the cleaning determination parameters based on the operating mode. When duplex printing is detected, the cleaning threshold is adjusted to prevent automatic cleaning, whereas in simplex mode the original cleaning schedule is maintained. This parameter change allows the system to optimize both image quality and productivity for different operating conditions.
2Reliability
If the cleaning sequence is carried out frequently to ensure pressure roller cleanliness, then image quality is maintained, but the apparatus downtime increases due to repeated cleaning interruptions
Solution Approach 1:
The cleaning determination unit implements a feedback mechanism that monitors the operating mode and adjusts cleaning timing accordingly. By integrating simplex operation counts and duplex operation counts with different weights, the system provides feedback on the actual cleaning need. When duplex printing is detected, the feedback indicates that cleaning is unnecessary, thereby preventing time loss while maintaining image quality when needed.
3Productivity
If the apparatus operates in two-sided printing mode continuously, then productivity is improved, but CaCO3 particles accumulate on the pressure roller affecting image quality
Solution Approach 1:
The system takes preliminary action by monitoring the duplex operation count and proactively determining when cleaning should be suppressed. The cleaning determination unit calculates the integrated value of duplex operations and compares it against thresholds to predict when the pressure roller would naturally be cleaned during normal operation, preventing unnecessary cleaning sequences before they occur and maintaining both productivity and image quality.
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
The solution allows for timely and efficient cleaning of the pressure roller, minimizing downtime and ensuring optimal image quality by integrating operation counts and notification systems, thus preventing excessive cleaning and maintaining continuous printing operations.
Implementation Method 1
a fixing apparatus (device) which fixes (thermally welds) a toner image on a sheet of recording paper to the sheet of recording paper by conveying the sheet of recording paper and the toner image thereon while pinching the sheet and the toner image thereon and applying heat and pressure
Implementation Method 2
The CaCO3 particles having adhered to the fixation roller transfer onto the next sheet of recording paper by way of the toner on the next sheet of recording paper
Data Source
AI summary
An image forming apparatus includes a toner image former; a fixing portion including a fixing roller and a pressing roller to fix the image; a feeder for reversing a facing orientation of the paper and refeed it to the image former; an executing portion for executing a cleaning mode in which a predetermined toner image is fixed on one side of paper, and the paper is refed to the image former with the reversed orientation to clean the pressing roller; a first integrator for integrating a number of the simplex mode executions; a notifying portion for prompting the cleaning mode operation upon a predetermined first integrated value; a second integrator for integrating a number of executions of a duplex mode in which toner images are formed on both sides of paper, wherein a corrector corrects the integrated value of the first integrator depending on the integrated value of the second integrator.