Discharge Guide Timing in Image Readers for Stable Sheet Speed
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Solution Overview
Problem
Existing image reading devices face issues with deteriorating reading accuracy due to fluctuations in sheet conveyance speed caused by the movement of the discharge guide influencing the discharge roller during reading operations.
Innovation Solution
An image reading device is designed with a controller that manages separate drive operations for the discharge roller and the discharge guide, stopping one operation when the other is performed to prevent interference and maintain consistent conveyance speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge guide moves according to the decrease in sheets supported by the supply tray, then the discharge opening can maintain proper positioning, but the movement influences the sheet in contact with the discharge roller causing conveyance speed fluctuation and deteriorating reading accuracy
Solution Approach 1:
The discharge guide is made movable through a link mechanism connected to the supply tray, allowing it to dynamically adjust its position as sheets are consumed. This dynamic adjustment maintains proper discharge positioning while the control unit coordinates the movement to occur during periods when reading operations are not正在进行, thus preventing conveyance speed fluctuation and preserving reading accuracy.
2Productivity
If the discharge roller rotates continuously to discharge sheets, then sheet discharge function is maintained, but the movement of discharge guide during this rotation influences the sheet causing conveyance speed fluctuation
Solution Approach 1:
The control unit implements periodic coordination between discharge roller rotation and discharge guide movement. The discharge guide moves in periodic intervals during periods when the discharge roller is not actively conveying sheets for reading operations. This periodic action ensures that sheet discharge function is maintained while preventing the discharge guide movement from influencing the sheet during critical reading periods, thus avoiding conveyance speed fluctuation and preserving reading accuracy.
Data Source
AI summary
An image reading device includes: a controller which performs a first drive operation for rotating the discharge roller, and a second drive operation for moving the discharge guide between the third position and the fourth position. The controller stops the first drive operation when performing the second drive operation, and stops the second drive operation when performing the first drive operation.