Printing Apparatus Sheet Type-Based Reading Method Selection
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Solution Overview
Problem
Existing image forming apparatuses face issues with diagnosing misregistration at the leading edge, particularly with high grammage charts, as they can jam when scanned using an auto document feeder (ADF), leading to inaccurate shift measurements.
Innovation Solution
A printing apparatus that includes a printing unit, a conveying unit, a reading unit capable of two methods of image reading (with and without conveying the sheet), and a determining unit to select the appropriate reading method based on the sheet type, allowing for adjustment image scanning either by ADF reading or pressing plate reading depending on the sheet's physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ADF is used to read the adjustment image on high grammage sheets, then the reading efficiency is improved, but the sheet may jam during conveyance
Solution Approach 1:
The system changes the reading method parameter based on sheet grammage. For high grammage sheets (≥150 g/m²), it switches from ADF reading to pressing plate reading, avoiding jamming while maintaining accurate misregistration measurement capability
2Extent of automation
If the ADF is used to read the adjustment image, then the automated reading process is improved, but the misregistration measurement accuracy deteriorates due to sheet bending
Solution Approach 1:
The system changes the reading method parameter based on sheet grammage. For high grammage sheets, it switches to pressing plate reading that prevents sheet bending, ensuring accurate misregistration measurement while still maintaining automated operation through controller coordination
3Measurement precision
If the pressing plate method is used to read the adjustment image, then the measurement accuracy is improved, but the reading speed deteriorates
Solution Approach 1:
The system dynamically selects the reading method based on sheet grammage. For low grammage sheets, it uses the faster ADF method, while for high grammage sheets, it uses the more accurate pressing plate method, optimizing the balance between speed and accuracy for each sheet type
Data Source
AI summary
A control method in a printing apparatus includes printing, by a printing unit, an adjustment image for adjusting a printing position on a sheet, conveying, by a conveying unit, the sheet on which the adjustment image is printed, reading, by a reading unit, an image to generate image data, the reading unit being executable to perform reading by a first reading method for reading an image of a sheet without conveying the sheet or a second reading method for reading the image of the sheet while conveying the sheet, and determining, based on that a type of the sheet on which the adjustment image is to be printed is a specific type, to read the adjustment image by the first reading method.