Inching Controller for Sheet Conveyance Failure Management
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Solution Overview
Problem
Conveyance failures such as floating, wrinkling, or folding of sheets during conveyance can lead to sheet conveyance failures, resulting in incomplete printing and potential damage to the printing apparatus, as existing systems lack effective mechanisms to manage and remove sheets with conveyance issues efficiently.
Innovation Solution
A conveying device with a rotating carrier, inlet and outlet rotary bodies, and an inching controller that performs coordinated operations to convey sheets downstream, allowing for controlled conveyance and removal of sheets with conveyance failures, preventing entanglement and damage to the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sheet experiences conveyance failure (floating, wrinkling, or folding) during conveyance, then the sheet cannot be properly conveyed through the printing apparatus, but stopping conveyance and ejecting the sheet to a purging tray causes interruption of printing operations and loss of productivity
Solution Approach 1:
The conveyance path is segmented into multiple sections: a first conveyance path through the image forming area, a second conveyance path bypassing the image forming area, and a purging tray area. The switching part divides the conveyance flow, allowing normal sheets to continue through the first path while failed sheets are redirected to the second path and purging tray, enabling simultaneous handling of different sheet states without complete system shutdown
Solution Approach 2:
The switching part acts as an intermediary component that monitors sheet conveyance status and dynamically redirects sheets based on their condition. It receives sheets from the upstream conveyance path and selectively directs them to either the first conveyance path (for normal sheets) or the second conveyance path leading to the purging tray (for failed sheets), enabling continuous operation while maintaining reliability
2Object-affected harmful factors
If the rotary conveyor continues rotating after detecting a conveyance failure, then subsequent sheets may become entangled with the failed sheet, but stopping the rotary conveyor causes interruption of printing operations
Solution Approach 1:
The system performs preliminary ejection of the failed sheet to the purging tray before it can cause entanglement with subsequent sheets. The switching part detects conveyance failure and immediately redirects the failed sheet to the second conveyance path, removing it from the main conveyance flow before the rotary conveyor completes its rotation, thus preventing entanglement while maintaining continuous operation
Solution Approach 2:
The failed sheet is extracted from the main conveyance flow and removed to the purging tray area through the second conveyance path. This extraction occurs while the rotary conveyor continues rotating, separating the problematic sheet from the normal sheet flow without stopping the main conveyance system, thereby preventing entanglement while preserving productivity
Data Source
AI summary
A conveying device includes a rotating carrier, an inlet rotary body, an outlet rotary body, a downstream conveyor, and an inching controller. The rotating carrier carries a sheet. The inlet rotary body transfers the sheet to the rotary carrier from upstream of the rotary carrier in a conveyance direction of the sheet. The outlet rotary body transfers the sheet to a downstream area from the rotary carrier in the conveyance direction. The downstream conveyor conveys the sheet downstream from the outlet rotary body in the conveyance direction. The inching controller performs an inching operation to convey the sheet on a conveyance path including at least the downstream conveyor. The inching controller causes at least the outlet rotary body and the downstream conveyor to perform a conveying operation in conjunction with each other in the inching operation.