Primary Transfer Roller Dynamics for Mode Shifting
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Solution Overview
Problem
Full-color tandem-type image forming apparatuses face productivity and service life issues when switching from full-color to monochrome mode, particularly due to the separation of image forming units and control of primary transfer rollers, which can lead to operational failures and reduced efficiency.
Innovation Solution
A transfer device with multiple photoconductors, a belt, and primary transfer rollers, controlled by circuitry to manage the contact and separation of the belt with photoconductors, allowing for efficient mode shifting without entering a fully separated state, thus enhancing productivity and preventing operational failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the image forming apparatus separates the image forming units and stops operations when switching from full-color to monochrome mode, then the service life of image forming units is improved, but productivity deteriorates due to operational failures and reduced efficiency
Solution Approach 1:
The primary transfer rollers are designed with dynamic control capability, allowing them to be selectively pressed against or separated from photoconductors based on printing mode requirements. This dynamic adjustment enables the system to maintain operational continuity in monochrome mode by keeping at least one primary transfer roller in contact with its photoconductor, thereby preventing productivity loss while still extending service life through controlled separation of unused image forming units.
2Reliability
If the primary transfer rollers are controlled to separate from photoconductors during mode switching, then operational failures are prevented, but productivity deteriorates due to reduced efficiency
Solution Approach 1:
The system implements dynamic control of primary transfer rollers where at least one roller maintains contact with its photoconductor during mode switching, ensuring continuous operational capability. This selective dynamic adjustment prevents operational failures by avoiding complete separation while maintaining reliability, thus resolving the contradiction between reliability and productivity.
3Duration of action of stationary object
If the image forming apparatus enters a fully separated state during mode shifts, then the service life of image forming units is improved, but productivity deteriorates due to continuous printing interruption
Solution Approach 1:
The primary transfer rollers are dynamically controlled to maintain selective contact with photoconductors during mode transitions. By pressing at least one primary transfer roller against its corresponding photoconductor during mode shifts, the system avoids complete separation and prevents printing interruptions, thereby reducing time loss while still protecting service life through controlled separation of non-used units.
Solution Approach 2:
The control circuitry ensures continuous useful action by maintaining contact between at least one primary transfer roller and its photoconductor during mode transitions. This continuity prevents printing interruptions and ensures uninterrupted operation, resolving the contradiction between extending service life and avoiding printing time loss.
Data Source
AI summary
A transfer device includes a plurality of photoconductors, a belt, a plurality of primary transfer rollers and control circuitry. The plurality of primary transfer rollers is disposed for the plurality of photoconductors, respectively. The plurality of primary transfer rollers brings the belt into contact with or separate the belt from the plurality of photoconductors. The control circuitry causes at least one of the plurality of primary transfer rollers to press against a corresponding at least one of the plurality of photoconductors to shift a printing mode.