Print Medium Feeding Device Skew Correction
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Solution Overview
Problem
Conventional print medium feeding devices are complex due to the need to control linear velocities of multiple roller pairs to correct skewing and meandering of print media during conveyance.
Innovation Solution
A print medium feeding device with a simple configuration, utilizing three conveyance units with distinct linear velocities and forces, where the third conveyance unit has the highest force and velocity, ensuring effective skewing correction without requiring complex velocity control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple roller pairs with controlled linear velocities are used to correct skewing, then skewing correction effectiveness is improved, but device complexity increases
Solution Approach 1:
The conveyance system is divided into three distinct conveyance units, each with independent conveyance force applying sections that can be controlled separately. This segmentation allows skewing correction to be achieved through coordinated operation of multiple units with different linear velocities and forces, resolving the contradiction by providing precise control capability while maintaining modular simplicity
Solution Approach 2:
The system utilizes different linear velocities (V1, V2, V3 where V2>V3>V1) and different conveyance forces (F1, F2, F3 where F3>F1>F2) across the three conveyance units to correct skewing. By changing these parameters in a coordinated manner, the system achieves effective skewing correction without requiring complex control mechanisms, as the parameter differences themselves create the corrective effect
2Measurement precision
If linear velocities of roller pairs are controlled to correct skewing, then conveyance accuracy is improved, but control system complexity increases
Solution Approach 1:
The conveyance units operate with dynamically different linear velocities and forces during the conveyance process. The first, second, and third conveyance force applying sections move at different linear velocities (V1, V2, V3) and apply different forces (F1, F2, F3), creating a dynamic system that automatically corrects skewing through the velocity and force differences rather than requiring complex real-time control adjustments
Solution Approach 2:
The system is configured in advance with specific velocity relationships (V2>V3>V1) and force relationships (F3>F1>F2) among the three conveyance units. This preliminary configuration of velocity and force parameters enables automatic skewing correction during conveyance without requiring complex real-time control systems, as the corrective action is built into the system's operational parameters from the start
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively corrects skewing and meandering of print media with a simplified configuration, maintaining stable conveyance across varying print medium lengths, without the need for complex velocity control systems.
Implementation Method 1
a first conveyance unit including a first conveyance force applying section that makes contact with the print medium and applies first conveyance force in the conveyance direction to the print medium
Implementation Method 2
a second conveyance unit including a second conveyance force applying section that makes contact with the print medium at a position downstream of the first conveyance force applying section in the conveyance direction and applies second conveyance force in the conveyance direction to the print medium
Implementation Method 3
a third conveyance unit including a third conveyance force applying section that makes contact with the print medium at a position downstream of the second conveyance force applying section in the conveyance direction and applies third conveyance force in the conveyance direction to the print medium
Data Source
AI summary
A print medium feeding device includes a guide unit; a first conveyance unit that applies first conveyance force F1 to the print medium, a first part of the first conveyance force applying section moving at a first linear velocity V1; a second conveyance unit including a second conveyance force applying section that makes contact with the print medium and applies second conveyance force F2 to the print medium, a second part of the second conveyance force applying section moving at a second linear velocity V2; and a third conveyance unit including a third conveyance force applying section that makes contact with the print medium and applies third conveyance force F3 to the print medium, a third part of the third conveyance force applying section moving at a third linear velocity V3, wherein V2>V3>V1 and F3>F1>F2 are satisfied.