Motor Control System for Stable Carriage Positioning
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Solution Overview
Problem
Conventional ink-jet image forming systems face challenges in maintaining the carriage at a target stop position due to fluctuations in driving current, leading to vibrations and movement issues, as they require precise control to balance static frictional forces and external factors.
Innovation Solution
A control system comprising a motor, a driving unit, and a detection unit, with a controller executing displacement control, determination processes, and holding control to determine and maintain the optimal holding current value, ensuring the carriage is stably held at the target stop position by adjusting the input current based on detected positions and operational values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the carriage is disposed at a position where the cap is slightly separated from the ink-jet head during flushing operation, then the flushing operation can be performed properly, but the driving current has shortage or surplus causing the carriage to move from the target stop position
Solution Approach 1:
The system uses a detection unit to detect the position of the carriage and feeds this information back to the controller. The controller adjusts the holding current value based on the detected position to maintain the carriage at the target stop position even when external forces act on it during flushing operations.
Solution Approach 2:
The system changes the holding current value as a parameter to adapt to different operational conditions. By adjusting the holding current based on the detected carriage position and operational state, the system maintains stable carriage positioning during flushing operations where the cap is slightly separated from the ink-jet head.
2Measurement precision
If the driving current is gradually changed to dispose the carriage at the target stop position, then the carriage can be positioned accurately, but vibration occurs and the carriage moves from the target stop position
Solution Approach 1:
The system performs preliminary positioning by gradually changing the driving current to dispose the carriage at the target stop position, then applies a predetermined holding current value to maintain that position. This preliminary positioning action allows the system to achieve accurate placement before stabilizing the carriage against vibrations and external forces.
Solution Approach 2:
The system dynamically adjusts the holding current value based on the detected carriage position. By making the holding current adaptive rather than fixed, the system can respond to vibrations and external forces in real-time, maintaining carriage stability while preserving positioning accuracy.
3Reliability
If the holding current value is constantly adjusted to hold the carriage at the target stop position, then the carriage position stability is improved, but the system complexity increases
Solution Approach 1:
The system uses the detection unit to automatically detect the carriage position and the controller to automatically adjust the holding current value without external intervention. This self-service approach maintains carriage position stability through automatic feedback control, reducing the need for complex manual adjustment mechanisms while improving reliability.
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 system effectively stabilizes the carriage at the target stop position, reducing the likelihood of movement due to vibrations or external forces, thereby enhancing the precision and reliability of the image forming process.
Implementation Method 1
a motor 81, a driving unit 70, and a detection unit 91, with a controller 40 executing displacement control, determination processes, and holding control to determine and maintain the optimal holding current value
Implementation Method 2
The detection unit 91 detects a position of the driving target
Implementation Method 3
the controller 40 controls the input current for the motor 81 based on the holding current value determined by the determination process to hold the driving target, which has been disposed at the target stop position in the displacement control process, at the target stop position
Data Source
AI summary
A control system includes: a motor; a driving unit including a driving target and displacing the driving target in a first direction and a second direction opposite to the first direction by transmitting power from the motor to the driving target; a detection unit detecting a position of the driving target; and a controller controlling the motor. The controller is configured to execute: a displacement control process to displace the driving target in the first direction and the second direction; a determination process to determine a holding current value holding the driving target at a target stop position; and a holding control process to hold the driving target, which has been disposed at the target stop position in the displacement control process, at the target stop position based on the holding current value determined by the determination process.