Inkjet Gap Detection via Dual-Rotation Mechanism
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Solution Overview
Problem
Conventional inkjet recording apparatuses face challenges in accurately adjusting the gap between the inkjet head and the conveyed sheet, particularly in handling sheets of varying thicknesses, which affects the detection accuracy of the operation amount required for appropriate gap maintenance.
Innovation Solution
A detection system is implemented, featuring a first rotating member that rotates in increments corresponding to 1/N of a full rotation, driving a second rotating member to output a monotonic increase or decrease in value, ensuring high accuracy in detecting the operation amount by associating specific output ranges with precise rotation angles, thus enabling accurate gap adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional detection device is used to detect the operation amount for gap adjustment, then the device structure is simple, but the detection accuracy is insufficient for sheets of varying thicknesses
Solution Approach 1:
The detection system is segmented into two rotating members with different rotation speeds (first rotating member and second rotating member). The first rotating member rotates at a slower speed while the second rotating member rotates at a faster speed (N times faster). This segmentation allows the system to detect operation amounts with higher precision by utilizing the faster-rotating second member while the slower first member provides stable reference positioning, thereby improving measurement accuracy without requiring a completely complex new system.
Solution Approach 2:
The first rotating member acts as an intermediary between the drive source and the second rotating member. It transmits rotational motion to the second rotating member through a controlled relationship (N:1 ratio), enabling precise detection of operation amounts. This intermediary structure allows the system to achieve high detection accuracy by mediating the relationship between the drive source and the detection mechanism, particularly for sheets of varying thicknesses.
2Adaptability or versatility
If the gap adjustment range is increased to handle various sheet thicknesses, then the adaptability is improved, but the detection accuracy may be compromised
Solution Approach 1:
The system employs dynamic rotation where the first and second rotating members rotate at different speeds (N:1 ratio). This dynamic relationship allows the detection system to adapt to various sheet thicknesses while maintaining detection accuracy. The faster-rotating second member provides sufficient resolution for precise detection across the entire adjustment range, while the slower first member ensures stable reference positioning, enabling the system to handle both thin and thick sheets accurately.
Solution Approach 2:
The system changes the rotation speed parameter of the two rotating members (with the second member rotating N times faster than the first) to achieve both wide adaptability and high detection accuracy. By adjusting the rotation speed ratio and assigning specific output ranges to corresponding rotation angles, the system can accurately detect operation amounts across the entire gap adjustment range required for various sheet thicknesses.
Data Source
AI summary
A detection system includes a detection target device and a detection device. The detection target device includes a first rotating member rotatable about a first axis, and repeats an operation corresponding to a rotation angle of the first rotating member every time the first rotating member makes a 1/N rotation, N being an integer of 2 or greater. The detection device includes a second rotating member rotatable about a second axis due to a driving force transmitted from the first rotating member. Every time the first rotating member makes a 1/N rotation, the second rotating member makes 1 rotation. Within a whole range of the output value of the detection device from a minimum value to a maximum value, a predetermined range where detection accuracy is guaranteed is assigned to a region corresponding to a 1/N rotation of the first rotating member.