Sheet Conveyance Control Device for Print Position Accuracy
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Solution Overview
Problem
In printing apparatuses, positional displacement of sheets during conveyance leads to variations in print start positions between the front and back sides, especially when using multiple sheet feeding cassettes with different conveyance paths, resulting in longer detection times and reduced printing efficiency.
Innovation Solution
A control device with a detection unit that only detects sheet positions intersecting with the conveyance direction for sheets from specific feeding units, allowing for targeted print start position adjustments based on detected positions, thereby reducing unnecessary edge detection and optimizing conveyance path corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sheet edge position detection is executed on all sheets from all feeding units, then print position accuracy is improved, but detection time increases and printing efficiency decreases
Solution Approach 1:
The patent applies local quality by differentiating the detection process based on the specific feeding unit being used. For feeding units with longer conveyance distances (higher risk of displacement), full sheet edge position detection is performed. For feeding units with shorter conveyance distances (lower risk of displacement), detection is skipped or simplified. This localized approach to quality control maintains print accuracy where needed while improving overall printing efficiency.
2Manufacturing precision
If sheet edge position detection is executed on all sheets, then positional displacement correction is improved, but detection time and processing time increase
Solution Approach 1:
The patent implements partial action by performing sheet edge position detection only on a subset of sheets from specific feeding units rather than on all sheets from all feeding units. The control unit determines which feeding units require detection based on their conveyance path characteristics. This partial detection approach maintains sufficient print position accuracy while significantly reducing the total detection time and processing overhead.
3Stability of the object's composition
If correction methods are implemented for multiple sheet feeding cassettes with different conveyance paths, then print position consistency is improved, but device complexity increases
Solution Approach 1:
The patent manages complexity by changing the parameter of detection necessity based on the feeding unit identifier and conveyance path characteristics. The control unit stores and references conveyance path information for each feeding unit, and uses this information to dynamically adjust the detection process. This parameter-based approach allows the system to handle multiple feeding units with different characteristics without requiring complex individual correction mechanisms for each unit.
Data Source
AI summary
A control device includes a detection unit configured to detect a position of a fed sheet in a direction intersecting with a conveyance direction of the sheet, and a setting unit configured to set a print start position in the direction intersecting with the conveyance direction based on the position of the sheet detected by the detection unit. The detection unit detects the position of the sheet in a case where the sheet is fed from a first feeding unit, and does not detect the position of the sheet in a case where the sheet is fed from a second feeding unit, the first feeding unit and the second feeding unit being among a plurality of feeding units that are different from each other in a distance to a printing unit.