Image Forming Apparatus Toner Management via Dynamic Contact Modes
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Solution Overview
Problem
In image forming apparatuses, the existing solutions for improving usability and reducing friction between cleaning blades and photosensitive drums when forming monochromatic images on thick media result in either downtime due to insufficient toner or adverse effects on the cleaning blade, leading to decreased image quality and user output efficiency.
Innovation Solution
An image forming apparatus with a contact-and-separation mechanism that detects toner levels and switches between monochromatic modes, allowing continuous operation by adjusting which image forming units contact the intermediary transfer belt, thereby managing toner supply and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image forming units for yellow, magenta and cyan are contacted to the intermediary transfer belt when forming monochromatic images on thick media, then the shock is alleviated and image quality is improved, but the friction between the cleaning blade and the photosensitive drum increases, lowering the sliding property
Solution Approach 1:
The patent changes the operational parameters by switching between two monochromatic modes: first mode where color image forming units are contacted to the intermediary transfer belt (reducing shock for thick media), and second mode where they are spaced from the intermediary transfer belt (reducing friction on photosensitive drums). The control unit dynamically adjusts which configuration is active based on printing conditions, thus resolving the contradiction between image quality and cleaning blade friction.
2Object-affected harmful factors
If a toner band is supplied to the cleaning blade with a predetermined interval to reduce friction, then the sliding property is improved, but when toner amount is insufficient for continuous band formation, long downtime generates, lowering usability
Solution Approach 1:
The patent implements a dynamic switching mechanism between two operational modes. Instead of continuously supplying toner bands (which causes downtime when toner is insufficient), the system dynamically switches to the second monochromatic mode where color image forming units are spaced from the intermediary transfer belt. This eliminates the need for continuous toner band supply while maintaining reduced friction, thus improving productivity and eliminating downtime.
3Object-affected harmful factors
If the image forming units for yellow, magenta and cyan are spaced from the intermediary transfer belt during monochromatic printing, then the friction on the photosensitive drum is reduced, but shock is transmitted to the intermediary transfer belt when thick media is used, affecting image quality
Solution Approach 1:
The patent employs dynamic switching between two configurations of the image forming units. In the first monochromatic mode, the color image forming units are contacted to the intermediary transfer belt to alleviate shock for thick media. In the second mode, they are spaced from the intermediary transfer belt to reduce friction on photosensitive drums. The control unit dynamically selects the appropriate mode based on the printing conditions, thus resolving the contradiction between friction reduction and shock alleviation.
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
Enhances usability by maintaining image quality and reducing downtime, while minimizing the impact on cleaning blades, even when toner levels are low, by dynamically adjusting the image forming process based on detected toner amounts and paper thickness.
Implementation Method 1
a detecting portion configured to detect information on an amount of the toner in the first developing device
Data Source
AI summary
An image forming apparatus includes an intermediary transfer member; a first image forming portion including a first developing device and a detecting portion; a second image forming portion including a second developing device; a contact-and-separation mechanism capable of setting a first state and a second state; and an executing portion capable of executing an operation in a first monochromatic mode in the first state and capable of executing an operation in a second monochromatic mode in the second state. When a toner amount in the first developing device is below a predetermined amount on the basis of the detecting portion during an image forming operation for continuously forming the black image in the operation in the first monochromatic mode, the executing portion continuously executes the image forming operation in the second state.