Original Reading Apparatus Variable Conveyance Speed Control
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Solution Overview
Problem
Existing original reading apparatuses face challenges with overlapped conveyance, particularly with small-sized originals, where the trailing end of one original separates from the pick-up roller before the leading end reaches the conveyance roller, leading to inaccurate detection and subsequent feeding issues, which can result in reduced productivity and reading quality.
Innovation Solution
An original reading apparatus with a separating and conveying unit, including a feed roller and a separating member, and a controller unit that controls the rotation speed of the pick-up and feed rollers to prevent overlapped conveyance by shutting off the driving force transmission when the leading end reaches the conveyance roller and resuming it when the trailing end is detected, ensuring accurate separation and conveying of small-sized originals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the original conveyance speed is decreased to prevent overlapped conveyance, then the separation accuracy of small-sized originals is improved, but the productivity is reduced
Solution Approach 1:
The invention applies dynamics by making the conveyance speed variable rather than fixed. The control unit dynamically adjusts the rotation speed of the conveyance roller based on the detected original size, using a lower speed for small-sized originals to prevent overlapped conveyance and a higher speed for large-sized originals to maintain productivity. This dynamic speed adjustment resolves the contradiction between separation accuracy and productivity.
Solution Approach 2:
The invention changes the conveyance speed parameter according to the original size. The control unit sets different rotation speeds for the conveyance roller based on whether the original is small-sized or large-sized, thereby optimizing both separation accuracy and productivity for different original types without requiring a fixed low speed for all cases.
2Productivity
If the conveyance speed is increased to improve productivity, then the output is improved, but overlapped conveyance occurs causing detection errors and feeding issues
Solution Approach 1:
The system dynamically adjusts conveyance speed based on original size detection. For small-sized originals, the speed is reduced to prevent overlapped conveyance that would cause detection errors, thereby maintaining reliability. For large-sized originals, the speed can be higher, maintaining productivity without causing overlap issues.
Solution Approach 2:
The invention uses feedback from the separation sensor that detects the trailing end of the original. This detection feedback allows the control unit to determine when one original has fully passed and when to start conveying the next original, preventing overlapped conveyance and detection errors while maintaining efficient operation.
3Reliability
If a fixed low conveyance speed is used for all original sizes, then overlapped conveyance is prevented, but productivity is reduced for large-sized originals
Solution Approach 1:
The invention changes the conveyance speed parameter based on original size. Small-sized originals are conveyed at a lower speed to prevent overlap, while large-sized originals are conveyed at a higher speed to maintain productivity. This parameter change approach allows the system to maintain reliability for all original types while optimizing overall processing speed.
Solution Approach 2:
The conveyance system is designed to handle multiple original sizes universally by adjusting its operation parameters. The same conveyance mechanism serves both small and large originals effectively by varying the rotation speed, making the system multi-functional rather than requiring separate mechanisms for different original sizes.
Data Source
AI summary
An original reading apparatus includes a reading unit, a pick-up roller, a feed roller, a conveyance roller, a conveyance motor, a clutch, and a controller unit to control the clutch and the conveyance motor such that the pick-up roller and the feed roller that receive a driving force from the conveyance motor rotate at a given rotation speed. The rotation speed is set to a first speed when reading an original having a first size at a first resolution, to a second speed higher than the first speed when reading an original having the first size at a second resolution lower than the first resolution, and to a third speed lower than the second speed, regardless of designation of the reading resolution, when reading an original having a second size smaller than the first size.