Document Conveying Speed Control for High-Resolution Scanning
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Solution Overview
Problem
Conventional image forming apparatuses experience reduced scanning efficiency and increased time from document pickup to discharge during high-resolution scanning due to the need for slower document conveying speeds, which also affects the reliability of the document pickup process.
Innovation Solution
The apparatus and method involve conveying documents at a default speed during initial stages and slowing down only during the high-resolution scanning operation, specifically on the scanning and conveying sections, while maintaining default speeds in other sections to improve efficiency and reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the document conveying speed is reduced throughout the entire conveying path to achieve high resolution scanning, then the scanning resolution is improved, but the scanning efficiency and productivity deteriorate
Solution Approach 1:
The conveying path is divided into multiple sections with different speed characteristics. The pickup section operates at a first speed, the arranging section at a second speed, and the scanning section at a third speed. This segmentation allows each section to be optimized independently, enabling high-resolution scanning while maintaining overall productivity.
Solution Approach 2:
Different sections of the conveying path are assigned different quality characteristics in terms of speed. The scanning section uses a slower third speed for high resolution, while the pickup and arranging sections use faster speeds (first and second speeds) to maintain efficiency. This local differentiation resolves the contradiction between resolution and productivity.
2Manufacturing precision
If the document conveying speed is reduced throughout the entire conveying path to achieve high resolution scanning, then the scanning resolution is improved, but the time from document pickup to discharge increases
Solution Approach 1:
The conveying operation is segmented into distinct phases with different speed profiles. The pickup section operates at a first speed, the arranging section at a second speed, and only the scanning section operates at a slower third speed. This segmentation minimizes the duration of slow conveying to only when necessary for high-resolution scanning.
Solution Approach 2:
The conveying speed is made dynamic rather than static throughout the entire path. The system adjusts speed according to the functional requirements of each section, using faster speeds for non-scanning portions and slower speeds only during the scanning operation, thereby reducing total cycle time while maintaining resolution quality.
3Speed
If the pickup roller rotating speed is reduced to match the slower conveying speed for high resolution scanning, then the document conveying speed is synchronized, but the pickup operation reliability deteriorates
Solution Approach 1:
The pickup section is separated from the scanning section in terms of speed control. The pickup roller operates at a first speed independent of the third speed used during scanning. This allows the pickup operation to maintain optimal speed for reliability while the scanning section uses slower speed for high resolution.
Solution Approach 2:
Different speed qualities are assigned to different functional sections. The pickup section uses a faster first speed for reliable document acquisition, while the scanning section uses a slower third speed for high-resolution imaging. This local differentiation maintains pickup reliability while achieving scanning quality.
Data Source
AI summary
In a method and an apparatus for forming image, digital image information is generated by conveying a document and scanning an image recorded on the document while conveying the document. When an image is scanned with a high resolution that is greater than a default resolution, a document is conveyed at a default speed at an initial stage and the document is conveyed at a speed slower than the default speed during an image scanning operation. The image forming apparatus includes a scan unit scanning the image recorded on the document, and a conveying unit which conveys the document at a default speed in an initial stage of conveying the document, and which conveys the document at a speed slower than the default speed while scanning the image in a high resolution scanning operation that has higher resolution than a default resolution.