Removable Background Member for Accurate Medium Position Detection
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Solution Overview
Problem
Conventional inkjet recording apparatuses face challenges in accurately detecting the end position of a recording medium due to foreign substances adhering to the background member, leading to false detections by the end position detection sensor.
Innovation Solution
A conveyance device comprising a conveyor, a position sensor, and a background member that is insertable and removable in the medium's width direction, with a holder and attachment base configuration that allows for easy cleaning of the background member to prevent false detections, ensuring accurate medium positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the background member is fixed and not removable, then the device structure is simpler, but foreign substances adhere to the background member causing false detections
Solution Approach 1:
The background member is segmented into a removable portion and a fixed portion. The removable portion can be detached for cleaning, while the fixed portion remains in place. This segmentation allows maintenance without complete disassembly, resolving the contradiction between reliability (through cleanable surfaces) and device complexity (through partial fixation).
Solution Approach 2:
The removable portion of the background member can be discarded when contaminated with foreign substances and replaced or recovered through cleaning. This principle ensures continuous reliable operation by eliminating accumulated contaminants that would otherwise cause false detections, while the fixed portion maintains structural integrity.
2Reliability
If the background member is removable for cleaning, then false detections are reduced, but the device structure becomes more complex
Solution Approach 1:
The background member is divided into removable and fixed portions with a simple attachment interface. This segmentation enables easy removal and reattachment while maintaining overall structural integrity, resolving the contradiction between reliability (through cleanability) and device complexity (through simple attachment mechanisms).
Solution Approach 2:
The attachment base and holder structure serves multiple functions: it secures the removable portion during operation, enables easy removal for cleaning, and ensures proper positioning during reattachment. This multi-functionality reduces the need for separate mechanisms, balancing reliability improvement with minimal added complexity.
3Adaptability or versatility
If the background member is rotatable, then the detection surface can be adjusted, but the mechanism becomes more complex
Solution Approach 1:
The background member transitions from a static to a dynamic configuration through rotatability. The rotation mechanism allows the detection surface to be adjusted to different angles or positions, enabling adaptation to various detection requirements while maintaining a relatively simple mechanical structure through the use of basic rotational joints.
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 solution ensures accurate detection of the medium's position, reducing false detections caused by foreign substances and enhancing the reliability of the image forming and liquid discharge processes.
Implementation Method 1
The end position detection sensor is disposed upstream from the belt conveyance unit in a recording-medium conveyance direction to detect an end position of the recording medium in a recording-medium width direction crossing the recording-medium conveyance direction using reflected light.
Data Source
AI summary
A conveyance device includes a conveyor, a position sensor, and a background member. The conveyor conveys a medium. The position sensor detects a position of the medium conveyed by the conveyor. The background member faces the position sensor. The background member is insertable and removable in a width direction of the medium crossing a conveyance direction of the medium.