Linear Encoder Positioning for Recording Device Gap Control
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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
A recording device equipped with a transport path, a recording section, a facing section, a motor, a movement unit, a position detecting unit (linear encoder), a rotation detecting unit (rotary encoder), and a control section that uses signals from these units to control the motor and accurately position the recording section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transport belt is used as the facing section, then the gap adjustment is simplified, but the position detection accuracy of the head unit deteriorates
Solution Approach 1:
The patent divides the detection system into two independent parts: a linear encoder for detecting the head unit's position in the transport direction, and a rotary encoder for detecting the motor's rotation. This segmentation allows each encoder to specialize in its specific measurement task, with the linear encoder providing precise position data regardless of the facing section material.
Solution Approach 2:
The patent introduces a linear encoder as an intermediary detection device between the head unit and the control system. This linear encoder directly detects the head unit's position without being affected by the facing section material (whether transport belt or alternative material), thereby maintaining measurement precision while allowing flexibility in facing section design.
2Manufacturing precision
If the head unit is moved to adjust the gap, then the recording performance is improved, but the position detection accuracy deteriorates
Solution Approach 1:
The patent implements a feedback control system where the linear encoder continuously monitors the head unit's position during movement, and this position information is fed back to the control unit. The control unit then adjusts the motor operation based on this feedback to achieve precise gap adjustment while maintaining accurate position detection throughout the movement process.
Solution Approach 2:
The patent replaces reliance on mechanical position detection methods with optical encoding systems. Instead of using mechanical linkages or sensors that might be affected by the transport belt material, the system uses linear and rotary encoders that detect position through optical means, providing more reliable and accurate position detection during head unit movement.
3Measurement precision
If a deceleration mechanism with ratio greater than 1 is used, then the stopping accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by using the rotary encoder to detect the motor's rotation in advance and calculate the expected position based on the deceleration mechanism's known ratio. This allows the control system to anticipate the head unit's position and make corrective adjustments before the actual stopping occurs, achieving high stopping accuracy even with the added complexity of the deceleration mechanism.
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 enables precise detection of the recording section's position, allowing for appropriate gap adjustment and improved stopping accuracy, thereby enhancing the recording device's performance.
Implementation Method 1
the position detecting unit is a linear encoder and includes a linear scale provided along the movement direction of the recording section and a first detection section that is a detection section provided in the recording section and that is configured to detect the linear scale
Implementation Method 2
the rotation detecting unit is a rotary encoder and includes a rotary scale configured to rotate with rotation of the motor and a second detection section configured to detect the rotary scale
Implementation Method 3
the movement unit has a deceleration mechanism having a deceleration ratio of greater than 1 when power is transmitted from the motor to the recording section
Data Source
AI summary
A linear ENC includes a movement unit configured to move the recording section by receiving power from a motor, a position detecting unit configured to detect a position of the recording section, a rotation detecting unit configured to detect the motor rotation, and a control section configured to control the motor, wherein the position detecting unit is a linear ENC, the rotation detecting unit is a rotary ENC, the movement unit has a deceleration mechanism having a deceleration ratio of greater than 1 when power is transmitted from the motor to the recording section, and the control section grasps the position of the recording section in the movement direction based on the signal of the linear ENC and controls the motor based on the signal of the rotary ENC.