Pinch Roller Conveyance for Sheet Buckling Prevention
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Solution Overview
Problem
Conveyance failures occur when processing elongated or stiffless sheets, such as A3 size papers, due to buckling issues during post-processing, especially when the sheets lack sufficient rigidity, leading to disruptions in the sheet conveyance system.
Innovation Solution
A sheet processing apparatus comprising a processing tray, conveyance roller, pinch roller, and controller, where the pinch roller can move between a standby and rotation position to sandwich the sheet with the conveyance roller, ensuring stable conveyance by controlling the pinch roller and conveyance roller to prevent buckling and conveyance failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an extrusion member is used to convey sheets from the processing tray, then productivity is improved by speeding up sheet discharge, but elongated or stiffless sheets may buckle and cause conveyance failures
Solution Approach 1:
The patent switches from a static extrusion member to a dynamic conveyance system using movable pinch rollers that can be positioned and activated as needed. The pinch rollers press against the sheet to provide controlled conveyance force, adapting to different sheet types and preventing buckling while maintaining efficient discharge speed.
Solution Approach 2:
The pinch rollers act as an intermediary conveyance mechanism between the processing tray and the discharge destination. Instead of directly extruding sheets, the system uses pinch rollers to gently guide and convey sheets, reducing the risk of buckling while maintaining conveyance efficiency.
2Reliability
If the pinch roller is positioned close to the conveyance roller to sandwich the sheet, then conveyance stability is improved, but alignment processing may be hindered
Solution Approach 1:
The pinch roller is designed to be movable rather than fixed, allowing it to dynamically adjust its position. During alignment processing, the pinch roller retracts to a standby position that does not interfere with alignment operations. When conveyance is required, the pinch roller moves to the rotation position to sandwich and convey the sheet, thus maintaining both alignment capability and conveyance stability.
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
The solution effectively prevents buckling and conveyance failures of soft and large-sized sheets by using the pinch roller and conveyance roller to convey sheets, ensuring reliable discharge and alignment without hindering the alignment processing.
Implementation Method 1
The pinch roller can be moved between a standby position apart from the conveyance roller and a rotation position close to the conveyance roller and moves to the rotation position at the time of conveying the sheet by the conveyance roller to sandwich the sheet with the conveyance roller
Data Source
AI summary
A sheet processing apparatus includes a processing tray, a conveyance roller, an extrusion member, a pinch roller and a controller. The conveyance roller is arranged at a downstream side of the processing tray in a sheet conveyance direction, and conveys the sheet. The extrusion member extrudes an end of an upstream side in the sheet conveyance direction of the sheet placed on the processing tray to the downstream side. The pinch roller moves to a rotation position at the time of conveying the sheet by the conveyance roller to sandwich the sheet with the conveyance roller. The controller controls the pinch roller and the conveyance roller to convey the sheet using the pinch roller and the conveyance roller when the sheet placed on the processing tray is conveyed to the downstream side in the sheet conveyance direction.