Sheet Conveyance Correction Using Feedback Detection
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Solution Overview
Problem
Image forming systems experience degradation in position accuracy due to sheet displacement and attachment differences in connection parts between devices, particularly in option devices connected downstream in the sheet conveying direction, leading to inefficiencies in post-processing operations.
Innovation Solution
A sheet conveying device with a correcting unit and controller is introduced, which includes a first conveying part, a frame, a moving part, and a detecting part to detect and correct sheet displacement by positioning the sheet's end edge at a predetermined reference position, ensuring accurate conveyance to the downstream path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conveyance path is lengthened to connect option devices downstream, then the functionality and capacity of the image forming system are enhanced, but sheet displacement in the orthogonal direction increases causing degradation of position accuracy
Solution Approach 1:
The patent employs a detecting part that continuously monitors the position of the sheet's side end edge and provides feedback to the controller. The controller adjusts the position of the first conveying part based on this feedback to correct any displacement in the orthogonal direction, thereby maintaining position accuracy despite the extended conveyance path.
Solution Approach 2:
The patent replaces purely mechanical positioning with a combined system that includes detecting parts and control mechanisms. Instead of relying solely on fixed mechanical alignment, the system uses detection and active correction to maintain position accuracy throughout the extended conveyance path.
2Device complexity
If traditional sheet conveying methods are used without correction, then the device complexity is low, but position accuracy degrades due to sheet displacement
Solution Approach 1:
The detecting part monitors sheet position and provides feedback to the controller, which adjusts the first conveying part to correct displacement. This feedback loop maintains position accuracy without requiring overly complex mechanical structures.
Solution Approach 2:
The patent introduces a dynamically adjustable first conveying part that can move in the orthogonal direction to correct sheet displacement. This dynamic adjustment capability allows the system to maintain accuracy without permanent complex mechanical structures.
3Manufacturing precision
If the correcting unit actively corrects sheet displacement, then position accuracy is improved, but the device complexity increases due to additional components
Solution Approach 1:
The correcting unit uses a feedback mechanism where the detecting part monitors position and the controller makes adjustments only when displacement is detected. This approach maintains accuracy while avoiding the complexity of continuously active correction mechanisms.
Solution Approach 2:
The system uses the detecting part and controller to automatically detect and correct sheet displacement without requiring manual intervention or overly complex mechanical structures. The correction mechanism serves itself by using detection data to make necessary adjustments.
4Productivity
If high-speed correction is implemented, then productivity is improved, but the complexity of the control system increases
Solution Approach 1:
The controller receives real-time feedback from the detecting part and makes rapid adjustments to the first conveying part. This feedback-driven approach enables high-speed correction without requiring overly complex control algorithms, as the system responds directly to detected position errors.
Solution Approach 2:
The correction mechanism operates periodically based on detection cycles rather than continuously. The detecting part checks sheet position at regular intervals, and the controller makes adjustments only when needed, enabling high-speed operation without complex continuous control systems.
Data Source
AI summary
A sheet conveying device includes a correcting unit. The correcting unit corrects displacement of a sheet conveyed from an upstream side conveying path, and conveys the sheet to a downstream side conveying path. The correcting unit includes a first conveying part conveying the sheet, a first moving part moving a first frame supporting the first conveying part and a detecting part detecting a side end edge of the sheet at a reference position without displacement. The first conveying part stops conveyance of the sheet when a leading end of the sheet reaches the detecting part. While the driving of the first conveying part is stopped, the first moving part moves the first frame to move the sheet, and stops movement of the first frame, when detection result of the detecting part is changed, to position the side end edge to the reference position to correct displacement of the sheet.