Dynamic Roller Phase Control for Inkjet Conveyance Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing method for correcting the amount of conveyance in inkjet recording apparatuses, particularly when transitioning from a conveying roller to an ejection roller, is inadequate due to fixed correction values that do not account for varying rotational phases of the rollers, leading to inaccuracies in sheet conveying accuracy.
Innovation Solution
A recording apparatus and method that dynamically adjust the rotational phases of the conveying and ejection rollers based on obtained information about the recording medium and recording speed, allowing for real-time correction of conveyance errors during the transitional period by using a controller to manage the rotational phases and apply specific correction values for each phase range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed correction value is used for the amount of conveyance during the transition from conveying roller to ejection roller, then the correction process is simple, but the sheet conveying accuracy deteriorates because the correction value does not account for varying rotational phases
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed correction value to a variable correction value that changes based on the rotational phase of the rollers. The controller dynamically adjusts the correction value according to the detected rotational phase, making the correction process adaptive rather than static. This resolves the contradiction by increasing complexity only where needed (during phase-dependent correction) while maintaining simplicity in other aspects.
Solution Approach 2:
The patent changes the parameter of correction value from a fixed constant to a variable parameter that depends on the rotational phase. By detecting the rotational phase and selecting appropriate correction values based on this detection, the system adjusts the correction parameter dynamically. This parameter change enables accurate correction across different rotational conditions while maintaining a relatively simple overall correction framework.
2Device complexity
If the rotational phases of conveying and ejection rollers are not synchronized, then the roller control is simple, but conveyance errors due to roller eccentricity increase
Solution Approach 1:
The patent implements feedback by detecting the actual rotational phases of the conveying roller and ejection roller, then using this detection information to adjust the correction values. The controller receives feedback from the rotational phase detection and modifies the conveyance correction accordingly. This feedback mechanism enables precise correction of conveyance errors caused by roller eccentricity while maintaining manageable control complexity through automated phase synchronization.
3Productivity
If correction values are determined without considering rotational phase, then the correction determination is simple, but the conveyance accuracy during transition deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-determining multiple correction values corresponding to different rotational phase ranges before actual conveyance occurs. These pre-calculated correction values are stored and selected based on the detected rotational phase during operation. This preliminary preparation enables fast and accurate correction determination during the transition period without requiring complex real-time calculations, thus maintaining both efficiency and precision.
Data Source
AI summary
A recording apparatus to record an image on a recording medium using a recording head includes a first conveying roller, a second conveying roller, and a controller. The first conveying roller is positioned upstream of the recording head in a conveying direction and the second conveying roller is positioned downstream of the recording head in the conveying direction. In response to a first conveying mode being selected, the controller performs a rotational phase control in which the controller controls rotational phases of the first conveying roller and the second conveying roller such that the recording medium is conveyed by predetermined sections of circumferences of the first conveying roller and the second conveying roller when a trailing end of the recording medium passes the first conveying roller. In response to the second conveying mode being selected, the controller does not perform the rotational phase control.