Image Reading Apparatus Motor Step-Out Control
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Solution Overview
Problem
Image reading apparatuses face issues with motor step-out states due to ambient temperature changes, leading to increased load on motors and reduced torque output, resulting in inefficient image data generation.
Innovation Solution
An image reading apparatus with a control portion that adjusts the movement speed of the reading portion based on the motor's state, switching between a first and second movement speed to prevent motor step-out states and maintain desired image data size, while detecting the reference position to determine the motor's state and selecting the appropriate reading operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the movement speed of the reading portion is reduced to prevent motor step-out, then the torque required to move the reading portion decreases, but the image data size increases due to more data points being read
Solution Approach 1:
The patent dynamically adjusts the movement speed of the reading portion based on real-time motor state detection. When the motor is detected to be in a step-out state, the system switches to a lower movement speed (second movement speed) to prevent further step-out events. This dynamic speed adjustment resolves the contradiction by adapting the movement parameters to current operational conditions rather than using a fixed speed, thereby maintaining reliability while managing data generation.
Solution Approach 2:
The system changes the movement speed parameter from a fixed value to a variable that can take two distinct values (first movement speed and second movement speed). This parameter change allows the system to optimize between preventing motor step-out (using lower speed) and maintaining efficient data generation (using higher speed), directly addressing the technical contradiction between reliability and data quantity.
2Manufacturing precision
If the movement speed of the reading portion is reduced to ensure correct positioning, then the torque required decreases, but the reading efficiency and productivity decrease
Solution Approach 1:
The system employs dynamic speed adjustment based on motor state. During normal operation when the motor is functioning correctly, the reading portion moves at the higher first movement speed to maintain productivity. When motor step-out is detected, the system transitions to the lower second movement speed to ensure accurate positioning. This dynamic approach resolves the contradiction by applying different speed levels based on real-time motor performance.
Solution Approach 2:
The control portion continuously monitors motor state to detect step-out conditions and provides feedback that triggers speed adjustment. This feedback mechanism ensures that the movement speed is automatically corrected when positioning accuracy is compromised by motor step-out, while maintaining high speed during normal operation to preserve productivity.
3Productivity
If the motor torque output decreases due to ambient temperature changes, then the motor may enter step-out state, but increasing the movement speed to maintain productivity increases the likelihood of step-out
Solution Approach 1:
The system dynamically adapts movement speed to ambient conditions by monitoring motor state. When temperature changes cause reduced motor torque output, the system detects the resulting step-out state and automatically reduces movement speed to the second movement speed, preventing further step-out events. This dynamic adaptation allows the system to maintain reliability under varying environmental conditions while maximizing productivity when conditions are favorable.
Solution Approach 2:
The control system uses feedback from motor state monitoring to adjust movement speed in response to ambient temperature effects. When step-out is detected (indicating reduced motor capability due to temperature), the feedback loop triggers a speed reduction. This feedback mechanism resolves the contradiction by allowing the system to respond to environmental changes and maintain both productivity and reliability.
Data Source
AI summary
An image reading apparatus includes a reading portion that reads an image on a target object; a motor that cause the reading portion to move; and a control portion that controls the reading portion and the motor. Further, in a case where the motor does not enter a step-out state, the control portion executes a first reading operation that causes the reading portion to read the image simultaneously with causing the motor to cause the reading portion to move at a high speed, and in a case where the motor enters the step-out state, the control portion executes a second reading operation that causes the reading portion to read the image simultaneously with causing the motor to cause the reading portion to move at a low speed, and generates image data having a resolution lower than a high resolution corresponding to the low speed.