Linear Scale Tension Adjustment for Recording Device Accuracy
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Solution Overview
Problem
Recording devices face accuracy issues due to variations in the length of linear scales caused by dimensional tolerances, leading to inconsistent displacement detection, particularly in large devices where tolerances accumulate, affecting the precision of movement mechanisms.
Innovation Solution
Incorporating a length adjustment unit that adjusts the tension of linear scales to stabilize their length, ensuring accurate detection and preventing tilting by aligning phases of multiple scales, thus maintaining stable movement of the moving unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear scale is attached to attachment members with tension applied by an elastic member, then the linear scale can be secured in position, but the length of the linear scale changes due to dimensional tolerances causing variance in displacement detection accuracy
Solution Approach 1:
The patent applies parameter changes by introducing a length adjustment mechanism that modifies the physical length of the linear scale to compensate for dimensional tolerances. The adjustment mechanism allows the linear scale length to be fine-tuned after attachment, changing the parameter from a fixed value to an adjustable one, thereby ensuring consistent detection accuracy across different devices.
Solution Approach 2:
The patent implements feedback by incorporating a detection mechanism that monitors the actual length of the linear scale and provides information back to the adjustment mechanism. This feedback loop enables the system to automatically or manually adjust the linear scale length to the correct value, compensating for manufacturing tolerances and ensuring accurate displacement detection.
2Measurement precision
If the linear scale length is adjusted to compensate for dimensional tolerances, then displacement detection accuracy is improved, but the device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The patent applies dynamics by making the linear scale attachment structure adjustable rather than fixed. The adjustment mechanism allows the linear scale length to be dynamically modified during assembly or operation to compensate for dimensional tolerances. This dynamic adjustment capability improves measurement precision without requiring a completely complex redesign of the entire attachment system.
Solution Approach 2:
The patent implements preliminary action by performing the length adjustment during the assembly process or before the device enters service. By adjusting the linear scale length in advance, the system ensures accurate displacement detection from the start operation, avoiding the need for complex real-time adjustments during actual use and thereby reducing operational complexity.
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 effectively stabilizes the detection accuracy of displacement by adjusting for variations in linear scale length, ensuring precise movement and reducing errors caused by tolerances, particularly in large recording devices.
Implementation Method 1
pressed in a direction away from the first end portion by an elastic member, such as a spring, and attached to an attachment member at a second end portion, which is an end portion opposite to the first end portion, with tension applied to the linear scale
Implementation Method 2
a detector configured to read the markings of the at least one linear scale while moving, together with the moving unit, relative to the medium support portion in the first axial direction to detect a displacement of the moving unit
Data Source
AI summary
A recording device includes a medium support portion, a recording head configured to eject a liquid toward a medium supported by the medium support portion, a gantry that includes the recording head and is configured to move relative to the medium support portion in a Y-axis direction, a first linear scale attached to a first attachment member, a first encoder configured to read markings of the first linear scale while moving, together with the gantry, relative to the medium support portion in the Y-axis direction to detect a displacement of the gantry, and a length adjustment unit configured to adjust a length of the first linear scale attached to the first attachment member, by adjusting a tension in the Y-axis direction applied to the first linear scale.