Document Conveying Apparatus Dynamic Pressurizing Control
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Solution Overview
Problem
Document conveying apparatuses using the lower side retrieval method face challenges in achieving high-speed document conveying while preventing multi-feed, as insufficient pressurizing force fails to convey documents, and excessive force causes frictional issues leading to multi-feed.
Innovation Solution
A document conveying apparatus with a pressurizing module that initially applies a first speed and pressurizing force to convey documents until detection by a sensor, then reduces the force and speed to prevent multi-feed, using a control module to manage the pick arm's pressure and roller speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressurizing force with the pick arm is increased to ensure document conveyance, then documents can be conveyed reliably, but the frictional force between stacked documents increases causing multi-feed
Solution Approach 1:
The pressurizing force is made dynamically adjustable rather than fixed. The control module changes the pressurizing force magnitude based on real-time feedback from the document detection sensor, applying higher force when documents are detected and lower force when no documents are present, thereby preventing multi-feed while ensuring reliable conveyance when needed
Solution Approach 2:
A feedback control mechanism is implemented using a document detection sensor that monitors the document conveying process. The sensor detects whether documents are present on the conveyance path, and this detection signal feeds back to the control module which adjusts the pressurizing force accordingly, creating a closed-loop control system that prevents multi-feed
2Productivity
If the roller speed is increased to achieve high-speed document conveying, then productivity improves, but documents may not be conveyed properly due to insufficient frictional force
Solution Approach 1:
The roller rotation speed is made dynamically adjustable based on document detection. The control module increases the roller speed to high values when documents are detected to improve productivity, and reduces the speed when no documents are present, thereby maintaining reliable document conveyance while achieving high-speed operation
Solution Approach 2:
The system performs preliminary detection of documents using the sensor before full-speed conveyance begins. This preliminary action allows the control module to prepare the appropriate roller speed and pressurizing force in advance, ensuring documents are conveyed reliably at high speed without attempting to convey empty sheets
3Device complexity
If a fixed pressurizing force is applied to convey documents, then the结构简单 (structure is simple), but high-speed conveying cannot be achieved without causing multi-feed
Solution Approach 1:
A feedback-based control system is implemented where a document detection sensor monitors the conveying process and provides real-time information to a control module. This feedback mechanism allows the system to automatically adjust pressurizing force and roller speed without requiring complex manual intervention, achieving high-speed conveying while preventing multi-feed through intelligent control
Solution Approach 2:
The control system performs self-adjustment based on sensor feedback without external intervention. The control module automatically modifies the pressurizing force and roller speed according to document detection results, enabling the system to optimize its own operation for high-speed conveying while maintaining reliability
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
Enables high-speed document conveying while minimizing the occurrence of multi-feed by optimizing the frictional force and conveying speed based on sensor detection, ensuring efficient document processing.
Implementation Method 1
the frictional force between the stacked documents increases
Implementation Method 2
a pick arm for pressing, from above, documents stacked on the document tray
Data Source
AI summary
The document conveying apparatus includes a document tray, a butted part with which leading edges of a plurality of documents stacked on the document tray are butted, a roller for conveying a document stacked at a lowermost position, a pressurizing module for pressurizing, from above, the documents stacked on the document tray, a separator, a first detector, provided between the butted part and the separator in a document conveying direction, for detecting a conveyed document, and a control module for causing the pressurizing module to pressurize the documents stacked on the document tray and causing the roller to rotate with a first speed until the first detector detects a document. In a case where the first detector detects a document, the control module reduces a force with which the pressurizing module pressurizes the documents and causes the roller to rotate with a second speed slower than the first speed.