Sheet Conveyance Control for Reading Apparatus
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Solution Overview
Problem
Existing reading apparatuses face issues with increased time required to read multiple sheets and the risk of sheets reaching the reading position before the acquiring process is completed, due to fixed conveyance start times and potential sheet misalignment.
Innovation Solution
A reading apparatus with a control device that manages sheet conveyance and reading processes, allowing the leading edge of the next sheet to be stopped at a specific position between the sheet tray and reading device, depending on stop conditions, to prevent unnecessary sheet stopping and ensure timely completion of the acquiring process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheets are temporarily stopped at the position between the platen and the reading position, then the reading apparatus can perform acquiring process (adjustment of light amount and shading data acquisition), but the time required to read a plurality of sheets increases
Solution Approach 1:
The system performs acquiring processes (light amount adjustment and shading data acquisition) in advance before the sheet reaches the reading position. By completing these preparatory operations beforehand, the system eliminates the need to pause sheet conveyance for these operations, thereby maintaining continuous sheet flow and reducing total reading time while ensuring acquiring processes are completed.
Solution Approach 2:
The conveyer maintains continuous operation without interrupting sheet conveyance for acquiring processes. The system coordinates the timing of acquiring processes with sheet movement, allowing multiple sheets to be processed continuously through the system while acquiring data and adjusting parameters in the background, thus eliminating idle time and maintaining productive action throughout.
2Device complexity
If the time from when a read instruction is received to when conveyance of a sheet starts is fixed, then the control is simplified, but a sheet may reach the reading position before the acquiring process is completed, or the time from when a read instruction is received to when the sheet is started to be read becomes longer uniformly
Solution Approach 1:
The system dynamically adjusts the conveyance start timing based on the position of sheets and the status of acquiring processes. Instead of using a fixed time delay, the control device calculates optimal conveyance start timing by considering sheet positions detected by sensors and the current state of acquiring processes, allowing the system to adapt timing to actual conditions and prevent sheets from reaching the reading position before acquiring is complete.
Solution Approach 2:
The system uses feedback from sheet position detection (via sensors detecting sheet edges) and acquiring process status to determine when to start conveyance. The control device continuously monitors sheet positions and adjusts conveyance timing based on this real-time information, ensuring that sheets are conveyed at the optimal moment when acquiring processes are complete and the sheet is in the correct position.
3Reliability
If sheets are always stopped between the sheet tray and the reading device, then the acquiring process can be completed, but the reading apparatus efficiency decreases due to frequent stopping
Solution Approach 1:
The system performs all necessary acquiring processes (light amount adjustment and shading data acquisition) before the sheet reaches the reading position. By completing these operations in advance during the sheet's travel time, the system eliminates the need to stop the conveyer for acquiring processes, maintaining continuous sheet flow and high productivity while ensuring all acquiring operations are completed.
Solution Approach 2:
The conveyer operates continuously without interrupting sheet conveyance. The system coordinates acquiring processes to occur during sheet movement, allowing the conveyer to maintain constant operation and process multiple sheets in sequence without stopping, thereby maximizing productivity while completing all necessary acquiring operations.
Data Source
AI summary
A reading apparatus including a reading device, a sheet tray, a conveyer, a receiving device, and a control device configured to execute, when the receiving device receives a read instruction, a conveying process of causing the conveyer to start conveyance of a sheet, execute a reading process of causing the reading device to read an image of the sheet passing a reading position of the reading device, execute a stop determining process of determining whether a stop condition of the conveyer is satisfied, and execute, in response to determining that the stop condition is satisfied, a stopping process of causing a leading edge of a next sheet to be stopped in a specific position which is any position between the sheet tray and the reading position.