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 upstream and downstream detectors, enabling more accurate and timely corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple position detectors are aligned along the sheet conveying direction to extend detection range, then measurement precision of positional deviation is improved, but device complexity increases
Solution Approach 1:
The sheet conveying path is divided into multiple detection zones with position detectors arranged at different locations (upstream, middle, and downstream positions). Each detector monitors a specific segment of the sheet, enabling comprehensive positional deviation detection across the entire conveying path without requiring a single complex detection system.
2Loss of time
If position detectors are placed further downstream to detect sheets after trailing end passes, then correction time is extended, but detection timing becomes more critical
Solution Approach 1:
Position detectors are strategically positioned upstream and at intermediate points before the sheet completely passes through the conveyance path. This allows the system to detect positional deviations early in the conveyance process, providing adequate time for correction before the sheet reaches the destination, thereby maintaining both extended correction time and high detection reliability.
3Manufacturing precision
If position corrector adjusts sheet based on sum of deviation amounts from multiple detectors, then manufacturing precision of sheet alignment is improved, but calculation complexity increases
Solution Approach 1:
The position corrector receives real-time positional deviation data from multiple position detectors aligned along the sheet conveying direction. By calculating the sum of deviation amounts from these detectors, the system generates a comprehensive feedback signal that accurately reflects the sheet's overall positional offset, enabling precise correction while maintaining manageable calculation complexity through systematic data aggregation.
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.