Intermediate Transfer Roller Speed Control for Image Position Deviation
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Solution Overview
Problem
Inkjet image forming devices experience back tension in recording media due to friction between intermediate transfer rollers and the media, leading to delays, image position deviations, and paper jams, which hinder increased processing speed.
Innovation Solution
An image forming device with a pickup roller, registration roller, and an intermediate transfer roller group, controlled by an operation pattern storage unit and controller, adjusts transfer speeds independently based on the distance between rollers and media length to minimize back tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intermediate transfer rollers are used to transfer recording media between pickup roller and registration roller, then stable transfer of recording media of various sizes is achieved, but back tension occurs in the recording medium causing delay in transfer timing and image position deviation
Solution Approach 1:
The intermediate transfer rollers are configured to rotate idly (freely) rather than being actively driven, allowing them to adapt dynamically to the transfer process without imposing fixed rotational constraints that cause back tension
Solution Approach 2:
The intermediate transfer rollers serve as passive intermediary elements between the pickup roller and registration roller, facilitating media transfer through friction without active drive engagement, thus eliminating the back tension problem
2Reliability
If intermediate transfer rollers are caused to perform accompanying rotational motion to prevent recording medium from traveling in opposite direction, then paper jam is prevented, but back tension causes delay in transfer timing and speed of image formation processing is prevented from increasing
Solution Approach 1:
The intermediate transfer rollers rotate idly in response to friction from the recording medium rather than being actively driven, enabling them to prevent paper jams through passive engagement while avoiding the back tension that would slow down processing
Solution Approach 2:
The intermediate transfer rollers self-regulate their rotation through friction engagement with the recording medium, automatically preventing paper jams without requiring active control that would create back tension and reduce processing speed
3Device complexity
If electromagnetic clutch or one-way clutch is used to drive intermediate transfer roller, then drive control is simplified, but accompanying rotational motion causes friction between intermediate transfer roller and recording medium leading to back tension
Solution Approach 1:
The patent removes the electromagnetic clutch or one-way clutch from the drive system of the intermediate transfer rollers, eliminating the mechanism that causes back tension while maintaining the necessary transfer function through passive friction engagement
Solution Approach 2:
The intermediate transfer rollers act as passive intermediaries that transfer motion through friction without active drive mechanisms, eliminating the harmful back tension effect while maintaining transfer control
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 solution effectively reduces back tension, allowing for precise timing and increased image formation speed by synchronizing the rotation of intermediate transfer rollers with the registration and pickup rollers, thereby enhancing processing performance.
Implementation Method 1
the recording medium is gripped by friction between the intermediate transfer roller and the recording medium
Data Source
AI summary
An image forming device including a pickup roller and a scraper roller configured to send out a print sheet to a feed route, a before-registration roller configured to send out a print sheet to a registration roller, and a control unit configured to independently control the transfer speed of the print sheet at each point based on operation patterns relating to the pickup roller and the scraper roller, and an intermediate transfer roller configured to transfer the print sheet between the before-registration roller and itself, wherein the operation pattern is set based on a relationship between a distance from the intermediate transfer roller to the before-registration roller or a distance from the intermediate transfer roller to the registration roller and a length of the print sheet.