Conveyance Apparatus Periodic Variation Correction
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Solution Overview
Problem
Conventional methods struggle to accurately correct periodic conveyance variations in recording apparatuses using multiple conveyance rollers, leading to suboptimal image quality due to limitations in manufacturing accuracy and correction methods.
Innovation Solution
A recording apparatus that calculates and applies correction values specific to each conveyance state, using a combination of conveyance rollers, by measuring periodic conveyance variation amounts for each rotational phase interval and adjusting the rotational amounts of main and discharge rollers to maintain consistent conveyance, thereby improving accuracy across different conveyance states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If very high accuracy is required in manufacturing mechanism parts to solve periodic conveyance deviation, then conveyance accuracy is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent changes the parameter of conveyance correction from a fixed manufacturing-based approach to a dynamic, measurement-based approach. By measuring the actual conveyance amount for each rotational phase interval and calculating correction values, the system adapts to actual performance variations without requiring ultra-precise manufacturing. This transforms the problem from a manufacturing precision issue to a control parameter adjustment issue.
Solution Approach 2:
The patent implements a feedback mechanism where the conveyance amount is actually measured for each rotational phase interval, and correction values are calculated based on these measurements. The correction value calculation unit uses the measured conveyance amounts to determine how much correction is needed, creating a closed-loop feedback system that continuously optimizes conveyance accuracy based on actual performance rather than relying solely on manufacturing precision.
2Ease of operation
If correction value based on single conveyance roller state is used, then correction is simple, but conveyance accuracy deteriorates in cooperative conveyance state with multiple rollers
Solution Approach 1:
The patent makes the correction system dynamic by detecting which conveyance rollers are currently in operation and switching correction values accordingly. The system dynamically selects between single-roller correction values and multi-roller correction values based on the operational state, ensuring that the appropriate correction methodology is applied for each specific conveyance configuration rather than using a static, one-size-fits-all approach.
Solution Approach 2:
The patent segments the correction methodology by conveyance state, creating distinct correction value sets for single-roller operation versus multi-roller cooperative operation. By dividing the correction approach into different segments based on operational conditions, the system can optimize accuracy for each specific state rather than compromising with a generic correction method.
3Adaptability or versatility
If conventional periodic conveyance variation amount correction method is employed, then correction is feasible in single roller state, but correction is unfeasible in cooperative conveyance state with multiple rollers
Solution Approach 1:
The patent creates a universal correction system that can handle multiple conveyance states (single roller and multi-roller cooperative states) through a unified methodology. By detecting the operational state and selecting appropriate correction values from different sets, the system achieves multi-functionality, making periodic conveyance variation correction applicable to all conveyance configurations rather than being limited to only single-roller states.
Data Source
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AI summary
The conveyance apparatus includes a first conveyance means (2) configured to convey a sheet in a conveyance direction, and a second conveyance means (6) disposed on a downstream side of the first conveyance means (2) in the conveyance direction and configured to convey the sheet in the conveyance direction. The conveyance apparatus corrects a rotational amount of each conveyance means using a correction value dedicated to each rotational phase of each conveyance means for each conveyance state, in a first conveyance state in which the first conveyance means (2) is operative to convey the sheet, a second conveyance state in which the first and second conveyance means (6) are cooperative to convey the sheet, and a third conveyance state in which the second conveyance means (6) is operative to convey the sheet.