Image Reading Apparatus Controller for Sheet Size-Based Reversing
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Solution Overview
Problem
Conveyance failure occurs in sheet conveyance apparatuses when a restricting member cannot move effectively, leading to issues during double-sided reading operations, especially with smaller-sized documents that are prone to buckling and deformation.
Innovation Solution
The implementation of a controller that manages the movement of a restricting member to prevent conveyance failure by prohibiting reversing operations for documents smaller than a certain size, ensuring the restricting member retracts only when sufficient force is applied, thus reducing the risk of buckling and deformation during double-sided reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the restricting member is configured to correct skew of the sheet by coming into contact with the leading edge, then the sheet conveyance reliability is improved, but conveyance failure occurs when the restricting member cannot be moved effectively, especially with smaller-sized documents
Solution Approach 1:
The controller changes the operational parameters of the restricting member based on detected sheet size. For small-sized sheets, the controller prohibits the reversing operation that would cause the restricting member to excessively restrict passage, thereby preventing buckling and conveyance failure while maintaining skew correction capability for normal-sized sheets
Solution Approach 2:
The system dynamically adjusts the restricting member's behavior based on real-time sheet size detection. The controller permits or prohibits specific operations (reversing) based on the sheet size, making the restricting member's function adaptive rather than fixed, thus preventing conveyance failure for small sheets while maintaining effectiveness for larger sheets
2Productivity
If the reversing operation is performed for double-sided reading, then the productivity is improved by reading both sides of the sheet, but the restricting member may cause buckling and deformation of smaller documents
Solution Approach 1:
The controller changes the operational parameters based on sheet size detection. For small-sized sheets, it prohibits the reversing operation that would cause the restricting member to excessively restrict passage during the second conveyance, preventing buckling while allowing double-sided reading for normal-sized sheets
Solution Approach 2:
The sheet size detection unit provides feedback about the sheet dimensions to the controller. Based on this feedback, the controller determines whether to permit or prohibit the reversing operation, creating a closed-loop control system that prevents buckling of small sheets while maintaining productivity for larger sheets
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly reduces the likelihood of conveyance failure during double-sided operations by preventing excessive stress on smaller documents, ensuring reliable sheet handling and image reading processes.
Implementation Method 1
the restricting member being configured to correct skew of the sheet by coming into contact with a leading edge of the sheet fed by the feeding roller at the restricting position, and to move from the restricting position to the retracted position by being pressed by the sheet
Data Source
AI summary
An image reading apparatus includes a stacking tray, a feeding roller, a restricting member configured to move to a restricting position and a retracted position, a reading sensor, a reversing roller configured to perform a reversing operation, a first conveyance path, a second conveyance, and a controller. The controller is configured to permit the reversing operation if the controller receives an execution instruction of a double-sided reading job on a sheet having a first size, and prohibit the reversing operation if the controller receives an execution instruction of the double-sided reading job on a sheet having a second size smaller than the first size.