Transport Roller Rotation Adjustment for Image Recording Positioning
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Solution Overview
Problem
Conventional image recording apparatuses face challenges in achieving high-quality image recording due to variations in transport accuracy caused by non-constant interposing force of the transport roller pair, leading to positioning issues perpendicular to the transport direction, which affects the transport accuracy and image quality.
Innovation Solution
An image recording apparatus that includes a position detecting section to determine the rotation amount of the driving roller based on the position of the recording medium in a direction perpendicular to the transport direction, allowing for precise control of the transport roller pair to improve transport accuracy and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the transport roller pair uses a constant interposing force, then the structure is simple, but the transport accuracy deteriorates due to non-constant actual interposing force in different positions
Solution Approach 1:
The system performs preliminary detection of the recording medium's position in the width direction before transport, and pre-adjusts the driving roller's rotation amount based on the detected position. This preliminary action compensates for variations in interposing force that would otherwise cause transport inaccuracies, allowing the use of a relatively simple constant interposing force structure while achieving high transport accuracy.
Solution Approach 2:
The invention changes the rotation amount parameter of the driving roller based on the detected position of the recording medium. By adjusting this parameter according to position, the system compensates for the non-constant interposing force characteristics, achieving accurate transport without requiring complex mechanical adjustments to the interposing force itself.
2Manufacturing precision
If the rotation amount is fixed, then the control is simple, but the transport accuracy deteriorates when recording medium positions vary
Solution Approach 1:
The system incorporates a position detection section that detects the position of the recording medium in the width direction, and feeds this information back to the control section. The control section then adjusts the driving roller's rotation amount based on this feedback, creating a closed-loop control system that maintains high transport accuracy while keeping the operation interface simple for the user.
Solution Approach 2:
The system performs self-adjustment of the rotation amount based on automatic position detection. The position detection section and control section work together to automatically determine and adjust the appropriate rotation amount without requiring manual intervention or complex user operations, maintaining ease of operation while achieving precise transport.
3Manufacturing precision
If the interposing force varies by position, then the transport adapts to different positions, but the transport accuracy deteriorates due to non-constant force
Solution Approach 1:
Instead of varying the interposing force parameter, the invention changes the rotation amount parameter of the driving roller based on position detection. This alternative parameter adjustment achieves the same goal of adapting to different positions while maintaining constant interposing force, thereby preserving force consistency while achieving position-adaptive accurate transport.
Data Source
AI summary
An image recording apparatus includes: at least one roller pair which has a driving roller and a driven roller facing the driving roller and which rotates while interposing the recording medium therebetween to transport the recording medium in a first direction; a recording section which records an image on the recording medium transported by the roller pair; a position detecting section which detects a position of the recording medium with respect to the roller pair in a second direction perpendicular to the first direction before the recording section starts recording; a determining section which determines a rotation amount of the driving roller before the recording section starts the recording depending on the position in the second direction of the recording medium detected by the position detecting section; and a control unit which controls the driving roller based on the rotation amount determined by the determining section.