Document Interval Control in Image Scanning Apparatus
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Solution Overview
Problem
Existing image scanning apparatuses face challenges in maintaining appropriate document intervals during scanning, particularly when dealing with documents of varying lengths, which can lead to overlapping or insufficient spacing, affecting throughput.
Innovation Solution
The apparatus includes a control unit that adjusts the feed speed of subsequent documents based on the length of preceding documents, using different speed settings (Vb1 and Vb2) depending on whether the document length exceeds or is less than a predetermined length, and also considers document characteristics like thickness, to accurately control the interval between documents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the document transport speed is increased to improve throughput, then the scanning efficiency is improved, but the document interval control becomes insufficient and documents may overlap
Solution Approach 1:
The patent applies dynamics by making the transport speed variable rather than constant. The control unit dynamically adjusts the transport speed based on the detected length of the preceding document, selecting from multiple speed levels (first speed for longer documents, second speed for shorter documents) to optimize both throughput and interval control for different document types
Solution Approach 2:
The patent changes the speed parameter of the transport mechanism based on document characteristics. By detecting document length and switching between different speed parameters (first speed and second speed), the system adapts the transport conditions to maintain appropriate document intervals while maximizing throughput for varying document lengths
2Productivity
If the document transport speed is increased to improve throughput, then the scanning efficiency is improved, but the document interval becomes intentionally short and documents may overlap
Solution Approach 1:
The patent changes the speed parameter of the transport mechanism based on document characteristics. By detecting document length and switching between different speed parameters (first speed and second speed), the system adapts the transport conditions to maintain appropriate document intervals while maximizing throughput for varying document lengths
3Manufacturing precision
If the feed speed is changed according to document length, then the document interval is appropriately adjusted, but the control complexity increases
Solution Approach 1:
The patent implements feedback by using a detection unit to measure the length of the preceding document and using this information to adjust the transport speed for the current document. The control unit receives length information and automatically selects the appropriate speed level, creating a closed-loop control system that adapts to varying document characteristics
Solution Approach 2:
The system performs self-service by automatically detecting document length and adjusting transport speed without requiring manual intervention. The control unit autonomously selects between different speed settings based on the detected document characteristics, eliminating the need for operator judgment or manual speed adjustment
Data Source
AI summary
When consecutively feeding a plurality of media, an image scanning apparatus, according to the length of a preceding medium in a feed direction, changes the feed control for feeding the succeeding medium.