Inkjet Recording Device Detection Roller Mechanism
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Solution Overview
Problem
Existing inkjet recording devices face challenges in accurately detecting the movement of recording media due to thickness variations, slippage, and serpentine issues in the belt conveyance system, leading to errors in detection values and reduced image quality.
Innovation Solution
The implementation of a driving unit that separates the driving force transmission from the gripping unit, allowing the movement unit to move the belt in conjunction with the placement part, enabling accurate detection of movement without the need for a robust gripping unit structure, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a belt conveyance mechanism with an endless belt is used to convey the recording medium, then the recording medium can be conveyed continuously, but thickness variation of the belt and eccentricity of the roller cause deviation in the actual movement amount from the designated feed amount
Solution Approach 1:
A detection roller is introduced as an intermediary element that contacts the recording medium directly to detect its actual movement amount. This mediator transfers the movement information from the medium to the detection mechanism, enabling accurate measurement independent of belt thickness variations and roller eccentricity.
Solution Approach 2:
The patent replaces the mechanical detection method (rotary encoder detecting roller rotation) with a direct contact detection method where the detection roller physically contacts and follows the recording medium's movement, substituting indirect mechanical measurement with direct mechanical following.
2Reliability
If rotary encoders are provided on both the first roller and facing roller to detect rotation and correct driving signals, then the thickness variation and eccentricity variations can be compensated, but the detection values are still erroneous due to belt thickness variation, slippage, and serpentine
Solution Approach 1:
The detection function is extracted from the drive system rollers and separated into a dedicated detection roller that contacts only the recording medium. This separation allows the detection system to independently measure actual medium movement without being influenced by belt condition issues.
Solution Approach 2:
The detection roller serves as an intermediary between the recording medium and the detection system, providing direct contact measurement that is immune to belt thickness variation, slippage, and serpentine effects that plague indirect measurement methods.
3Reliability
If the gripping unit is made robust to ensure reliable gripping of the recording medium, then the gripping reliability is improved, but the structure becomes complicated and the detection accuracy is reduced due to slippage at the gripping part
Solution Approach 1:
The detection function is extracted from the gripping unit, allowing the gripping unit to focus solely on reliable gripping while the separate detection roller handles measurement. This functional separation eliminates the conflict between gripping force and detection accuracy.
Solution Approach 2:
The system is segmented into distinct functional units: the gripping unit for reliable holding and the detection roller for accurate measurement. This segmentation allows each unit to be optimized for its specific function without compromise.
Data Source
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AI summary
The disclosure is to accurately detect an actual movement amount of a recording medium without being influenced by a thickness variation of the recording medium or a belt configured to convey the recording medium. An inkjet recording device 10 of the disclosure includes a movement unit 31 configured to move a recording medium M or a placement part 30 configured to place the recording medium M thereon, a detection unit 40 configured to continuously detect movement of the recording medium M or the placement part 30, and a control unit 28 configured to control the movement unit 31 and the detection unit 40. The detection unit 40 includes a gripping unit 42 having a gripping part 44 configured to grip the recording medium M or the placement part 30 and a detection part 48 configured to continuously detect movement of the gripping unit 42. The gripping unit 42 is configured to grip the recording medium M or the placement part 30 by the gripping part 44 and to thus move in conjunction with the movement of the recording medium M or the placement part 30. The control unit 28 is configured to control the movement of the movement unit 31 on the basis of a detection result by the detection part 48 when the gripping unit 42 is moved.