Sheet Conveyance Position Correction Using Multiple Detectors
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Solution Overview
Problem
Existing sheet conveying devices in image forming apparatuses face challenges in accurately detecting and correcting positional deviations of sheets over a wide range during conveyance, leading to insufficient position correction due to limited detection capabilities and timing constraints.
Innovation Solution
The implementation of multiple position detectors aligned along the sheet conveying direction, including a trailing end detection sensor, allows for precise detection of positional deviations, with a position corrector that corrects the sheet position based on the sum of deviation amounts from previous and subsequent sheets, enabling more accurate and timely position adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple position detectors are aligned along the sheet conveying direction, then the detection range and measurement precision of sheet positional deviation are improved, but the device complexity increases
Solution Approach 1:
The sheet conveying path is divided into multiple detection zones by aligning multiple position detectors (first, second, and third CIS) at different locations. Each detector monitors positional deviation at its specific location, enabling comprehensive coverage of the entire sheet conveyance process from upstream to downstream regions.
2Manufacturing precision
If position correction is based on the sum of positional deviation amounts from multiple detectors, then the position correction accuracy is improved, but the calculation complexity and time required increase
Solution Approach 1:
Positional deviation amounts are detected by multiple CIS at different locations along the conveyance path before the sheet reaches the correction point. The correction amount calculation is prepared in advance by summing the deviation amounts from all detectors, enabling timely correction without delaying the sheet processing.
Solution Approach 2:
The system continuously monitors positional deviation at multiple points and uses this feedback information to dynamically adjust the correction amount. The correction amount calculation unit processes the summed deviation data to determine the appropriate correction, creating a closed-loop control system that improves accuracy while maintaining efficiency.
Data Source
AI summary
A sheet conveying device, which is included in an image forming apparatus and a post processing device, includes multiple position detectors and a position corrector. The multiple position detectors are aligned along a sheet conveying direction and configured to detect a side end of a sheet. The position corrector is configured to convey the sheet and correct a position of the sheet based on a positional deviation amount of the sheet, obtained by a detection result of the multiple position detectors. The positional deviation amount of the sheet is obtained by an extreme downstream position detector in the sheet conveying direction, of the multiple position detectors. A position of a subsequent sheet is corrected based on a sum of the positional deviation amount of the sheet and a positional deviation amount of the subsequent sheet.