Sheet Conveyance Correction for Angular and Lateral Displacement
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Solution Overview
Problem
Sheet conveying devices in image forming apparatuses face challenges with positional deviations in the direction of rotation and width, leading to misalignment of image formation, which existing systems attempt to correct by detecting angular and lateral displacements but often require separate operations for each, increasing the time and complexity of the correction process.
Innovation Solution
A sheet conveying device equipped with a detector and corrector, controlled by circuitry, simultaneously detects and corrects both angular and lateral displacements of the sheet by rotating and shifting the rollers in conjunction, allowing for concurrent correction of positional deviations during the conveying process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate operations are performed to correct angular displacement and lateral displacement, then each displacement can be corrected accurately, but the correction time increases and the process becomes more complex
Solution Approach 1:
The patent combines the correction of angular displacement and lateral displacement into a single integrated operation. The corrector simultaneously performs both angular correction (rotating the sheet by the angular displacement correction amount) and lateral correction (moving the sheet in the width direction by the lateral displacement correction amount) during one conveying process, rather than executing them as separate sequential operations.
Solution Approach 2:
The patent implements dynamic correction by calculating both angular and lateral displacement correction amounts based on real-time detector readings during conveyance, and adjusting the corrector's motion parameters dynamically to achieve both corrections concurrently. The system adapts the correction trajectory based on the detected sheet attitude and displacement.
2Measurement precision
If separate operations are performed to correct angular displacement and lateral displacement, then each displacement can be corrected accurately, but the system complexity increases
Solution Approach 1:
The patent merges the correction mechanisms for angular and lateral displacements into a unified corrector system. The circuitry integrates the control logic for both correction types, and the corrector executes both corrections through a coordinated single operation, reducing the overall system complexity compared to maintaining separate correction subsystems.
Solution Approach 2:
The corrector is designed as a multi-functional device that can perform both angular correction and lateral correction functions. The same corrector mechanism handles multiple correction tasks (angular displacement correction and lateral displacement correction) within a single operational cycle, eliminating the need for separate dedicated correction devices for each type of displacement.
3Measurement precision
If the corrector rotates the sheet to correct angular displacement after gripping, then angular correction is achieved, but the correction time increases
Solution Approach 1:
The patent performs preliminary angular correction by rotating the corrector (or the sheet within the corrector) to the appropriate angle before the main conveying action begins. This preliminary angular adjustment ensures that when gripping occurs, the sheet is already oriented correctly, allowing subsequent lateral correction to happen during the conveying motion itself rather than requiring a separate rotation step afterward.
Solution Approach 2:
The system dynamically coordinates the rotation and conveying motions to achieve angular correction during the conveying process itself. The corrector adjusts its rotational speed and position dynamically to complete both angular and lateral corrections within the conveying time frame, optimizing the balance between correction accuracy and conveying efficiency.
Data Source
AI summary
A sheet conveying device includes a detector configured to detect an attitude of a conveyance target medium, a corrector configured to perform a correcting operation based on a detection result of the detector, and circuitry configured to calculate an angular displacement correction amount and a lateral displacement correction amount of the conveyance target medium, cause the corrector to perform the correcting operation in a direction perpendicular to a sheet conveying direction, based on the lateral displacement correction amount, after the corrector grips the conveyance target medium, and cause the corrector to rotate by the angular displacement correction amount of the conveyance target medium before the corrector grips the conveyance target medium and to perform the correcting operation in a direction of rotation of the conveyance target medium, based on the angular displacement correction amount, after the corrector grips the conveyance target medium.