Scanning Device Speed Control for Document Handling
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Solution Overview
Problem
Multifunctional printers or scanners experience reduced scanning performance due to prolonged paper transportation, scanning, and discharge times at fixed motor speeds, leading to inefficient operation.
Innovation Solution
A scanning device with a control unit and image detection unit that adjusts transport speed based on document position, switching to a lower speed for scanning and higher speed for transportation to optimize document handling and reduce overall scanning time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor operates at a fixed speed during paper transportation, scanning, and discharge, then the device structure is simple, but the scanning performance is reduced due to prolonged operation time
Solution Approach 1:
The motor speed is changed from fixed to dynamic, allowing it to adjust between first speed (during scanning) and second speed (during transportation and discharge). This dynamic speed adjustment reduces the total operation time while maintaining simple device structure without requiring multiple motors or complex transmission systems.
2Loss of time
If the motor operates at a fixed speed, then the control system is simple, but the time required for paper transportation, scanning, and discharge is too long
Solution Approach 1:
The motor operates in periodic cycles, alternating between first speed during scanning phases and second speed during transportation and discharge phases. The control unit manages these periodic speed changes based on the scanning process stage, reducing total operation time while keeping the control system relatively simple through state-based speed switching.
3Productivity
If the motor operates at a fixed speed, then the energy consumption is stable, but the scanning performance is reduced
Solution Approach 1:
The motor speed parameter is changed from a constant value to a variable parameter that switches between first speed and second speed based on the scanning process requirements. This parameter change enables faster transportation and discharge phases, improving overall scanning performance while managing energy consumption through optimized speed profiles.
Data Source
AI summary
A scanning device and an image forming device are provided. The scanning device includes a control unit and an image detection unit. The control unit is used to control the scanning device to transport an original document at a first speed, and the image detection unit is used to detect a position where the original document reaches. When the image detection unit detects that a front end position of the original document reaches a first scanning preset position, the control unit controls the scanning device to transport the original document at a second speed smaller than the first speed. After the scanning is completed, when the image detection unit detects that a rear end position of the original document reaches a first scanning end position, the control unit controls the original document to be transported at the first speed and discharged.