Registration Roller Oscillation for Image Deviation Correction
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately correcting material deviations due to varying pressure contact forces of rollers, leading to incomplete deviation correction and image misalignment, especially with long sheets.
Innovation Solution
An image forming apparatus that includes a conveyor, transferer, fixer, deviation detector, and controller to adjust the registration roller's oscillation based on real-time pressure contact force data and recording material characteristics, allowing for precise deviation correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the registration roller is oscillated with a fixed drive amount based on image formation position displacement, then the oscillation operation can be performed, but the deviation of the recording material cannot be sufficiently eliminated when pressure contact force of the roller increases
Solution Approach 1:
The patent applies dynamics by making the oscillation drive amount variable rather than fixed. The controller dynamically adjusts the oscillation drive amount of the registration roller based on real-time detection of recording material deviation and the pressure contact force of the roller. This allows the system to adapt to changing conditions (different paper types, weights, and pressure forces) to effectively correct deviation, resolving the contradiction between maintaining alignment precision and ensuring reliable correction across varying operational conditions.
2Force
If the pressure contact force of the roller increases, then the grip on the recording material improves, but the resistance to movement increases and the movement amount of the recording material decreases
Solution Approach 1:
The patent applies parameter changes by adjusting the oscillation drive amount parameter based on the pressure contact force parameter. When the pressure contact force increases (causing higher resistance to movement), the controller increases the oscillation drive amount to compensate. This dynamic parameter adjustment ensures that the recording material can still be effectively oscillated to correct deviation, even under higher pressure conditions, thus resolving the contradiction between grip strength and movement capability.
3Manufacturing precision
If conventional registration oscillation correction is performed only before the recording material reaches the secondary transfer roller, then the initial deviation can be corrected, but the recording material may deviate again after reaching the secondary transfer roller due to misalignment or roller diameter differences
Solution Approach 1:
The patent applies continuity of useful action by extending the oscillation correction process to occur continuously or at multiple stages - both before the recording material reaches the secondary transfer roller and after passing through it. The deviation detector continuously monitors the recording material position, and the controller continuously adjusts the registration roller oscillation to maintain alignment. This continuous correction action prevents deviation from occurring in the first place and corrects any deviation that occurs during conveyance, resolving the contradiction between initial correction effectiveness and sustained alignment over the entire operation duration.
Data Source
AI summary
To provide an image forming apparatus capable of sufficiently correcting deviation of a recording material by an oscillation operation of a registration roller.Configuring an image forming apparatus including: a conveyor that conveys a recording material; a transferer that includes a transfer roller that transfers a toner image onto the recording material; a fixer that includes a fixing roller that fixes the toner image formed on the recording material; a deviation detector that detects a position of the recording material in a conveyance intersecting direction; a deviation corrector that is located on an upstream side of the transferer and moves the recording material in the conveyance intersecting direction to correct deviation of the recording material; and a controller that controls a drive amount of the deviation corrector on the basis of a detection result of the deviation detector and the pressure contact force of a nipper nipping the recording material being conveyed.