Recording Device Head Position Detection Using Dual Encoder Feedback
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Solution Overview
Problem
Existing recording devices face challenges in accurately detecting the position of the head unit during movement and adjusting the gap between the recording section and the facing section effectively.
Innovation Solution
The recording device incorporates a linear encoder and a rotary encoder to detect the position and rotation of the recording section, respectively. A control section sets the origin position based on signal changes from these encoders during the placement and removal of the recording section from the facing section, allowing for precise gap adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the recording section is lowered toward the facing section using motor power, then the gap between the recording section and facing section can be adjusted, but it becomes difficult to accurately detect the position when the recording section is placed on the facing section by its own weight due to idle motor rotation
Solution Approach 1:
The patent uses feedback from both the rotary encoder (detecting motor rotation) and linear encoder (detecting recording section position) to determine when the recording section has been placed on the facing section. The control section monitors the relationship between motor rotation signals and linear position signals to accurately detect the placement state despite idle rotation, resolving the contradiction between measurement precision and device complexity.
2Manufacturing precision
If idle rotation of the motor is allowed after the recording section is placed on the facing section by its own weight, then the recording section can be accurately positioned, but the position detecting unit cannot accurately detect the position due to motor rotation
Solution Approach 1:
The patent introduces the linear encoder as an intermediary measurement device that directly detects the recording section's position on the transport path, independent of motor rotation. By comparing the linear encoder's position signal with the rotary encoder's motor rotation signal, the system can distinguish between position changes caused by intentional movement versus idle rotation, thereby maintaining measurement precision during gap adjustment.
3Ease of operation
If the origin position is set based solely on linear encoder signals, then position detection is simplified, but accurate detection fails when the recording section is placed by its own weight due to idle motor rotation
Solution Approach 1:
The control section uses feedback from both encoder types to set the origin position. It monitors when the linear scale passes a specific position while the motor is in a stopped state (indicated by rotary encoder signals), ensuring the origin is set only when the recording section is deliberately positioned rather than during idle rotation from self-placement, thus maintaining both ease of operation and measurement precision.
Data Source
AI summary
A recording device includes a facing section disposed facing a recording section and a movement unit configured to move the recording section by receiving power from a motor. A control section sets an origin position of the recording section in a movement direction based on a position of the recording section when a signal change of a linear encoder disappears in a state where a signal change of a rotary encoder exists while the recording section is being lowered toward the facing section or a position of the recording section when the signal change of the linear encoder appears in a state where the signal change of the rotary encoder exists while the recording section is being raised from a state of being placed on the facing section.