Printing Apparatus Sheet Orientation Control for Free Size Media
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Solution Overview
Problem
Printing errors occur when the orientation of sheets in a sheet stacking unit is not specified, leading to inefficient printing and potential loss of image due to incorrect sheet orientation, especially when using the 'FREE SIZE' setting, as users may inadvertently place sheets with the short side as the leading edge instead of the long side, resulting in suboptimal print orientation.
Innovation Solution
The printing apparatus includes a control method that determines whether to print an image without rotation or with rotation based on the 'FREE SIZE' setting, allowing users to select between portrait-feeding and landscape-feeding modes to prevent printing errors by matching the sheet orientation with the intended image orientation, thereby ensuring accurate printing regardless of sheet size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the sheet is conveyed with the short side as the leading edge to print the image in portrait orientation, then the image can be printed in the desired portrait orientation, but the length of the sheet in the conveyance direction becomes longer, increasing printing time and reducing printing efficiency
Solution Approach 1:
The printing apparatus dynamically determines the sheet conveyance orientation based on the detected sheet size. When a small-sized sheet (A5 or smaller) is detected, the apparatus automatically sets the conveyance orientation to landscape (long side as leading edge) to improve printing efficiency. When a large-sized sheet is detected, the apparatus sets the conveyance orientation to portrait (short side as leading edge) to maintain image orientation accuracy. This dynamic adaptation resolves the contradiction by selecting the optimal orientation based on actual sheet dimensions.
2Ease of operation
If the 'FREE SIZE' setting is used to allow users to place sheets without specifying orientation, then ease of operation is improved, but printing errors occur when users inadvertently place sheets with the short side as the leading edge instead of the long side
Solution Approach 1:
The printing apparatus performs self-detection of sheet size using the sheet size detection unit, and automatically determines the appropriate conveyance orientation without requiring user input. When 'FREE SIZE' is selected, the system still maintains reliability by autonomously detecting whether the sheet is small-sized or large-sized and adjusting the conveyance orientation accordingly. This self-service mechanism eliminates the need for users to manually specify orientation while preventing printing errors.
Solution Approach 2:
The apparatus incorporates a sheet size detection unit that provides feedback about the actual sheet dimensions to the control unit. Based on this feedback, the control unit automatically adjusts the conveyance orientation setting. This feedback mechanism ensures that even when users place sheets without proper orientation markers, the system can detect the actual orientation and correct it, maintaining printing accuracy while preserving ease of operation.
3Productivity
If the printing apparatus is configured to perform printing after rotating the image by 90 degrees when 'FREE SIZE' is set, then printing efficiency is improved by conveying sheets with the long side as the leading edge, but printing errors occur when users place sheets with the short side as the leading edge
Solution Approach 1:
The system dynamically adjusts the image rotation strategy based on detected sheet size. When a small-sized sheet is detected, the apparatus prints without rotation, assuming the user has placed the sheet with the long side as the leading edge. When a large-sized sheet is detected, the apparatus rotates the image by 90 degrees before printing. This dynamic adjustment allows the system to maintain both high printing efficiency and accuracy by adapting to different sheet sizes and user placements.
Data Source
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AI summary
A printing apparatus includes a storage unit for storing information indicating an orientation of a sheet stacked in a sheet stacking unit, a determination unit that determines whether to print an image in a first orientation corresponding to a case where the sheet is conveyed with a short side thereof as a leading edge from the sheet stacking unit, or to print the image in a second orientation corresponding to a case where the sheet is conveyed with a long side thereof as the leading edge from the sheet stacking unit, according to a setting value based on an operation of a user in a case where the information indicating the orientation of the sheet stacked in the sheet stacking unit is not stored in the storage unit.