Image Reader Motor Load Control for Stable Document Conveyance
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Solution Overview
Problem
Existing image reading devices using DC motors experience sudden unavailability due to power load increases, leading to impaired user convenience, as the timing of nonavailability is not optimally managed.
Innovation Solution
The image reading device includes a control unit that detects the power load value of the DC motor and adjusts the conveyance velocity from a first to a second, lower velocity when the power load exceeds a threshold, thereby managing power consumption and preventing device unavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the DC motor conveys the document at a high conveyance velocity, then the productivity of the image reading device is improved, but the power load on the DC motor increases causing earlier device unavailability
Solution Approach 1:
The patent implements dynamic adjustment of conveyance velocity based on real-time power load detection. The control unit monitors the power load value of the DC motor and automatically reduces the conveyance velocity from a first velocity to a second velocity when the power load exceeds a threshold, thereby extending device availability while maintaining optimal performance when conditions allow
Solution Approach 2:
The patent changes the operational parameters of the DC motor based on detected power load conditions. When the power load value exceeds a predetermined threshold, the system changes the conveyance velocity parameter from a higher first velocity to a lower second velocity, allowing the device to continue operating in an available state for a longer period
2Reliability
If the timing at which the image reading device becomes nonavailable is set early with a margin, then the reliability is improved, but the productivity deteriorates due to longer periods of unavailability
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously detects the power load value of the DC motor and uses this information to adjust the conveyance velocity. This feedback loop allows the system to respond to actual motor conditions rather than following a fixed schedule, optimizing both reliability and productivity
Data Source
AI summary
An image reading device includes a DC motor, a roller driven by the DC motor, a reading unit configured to read an image from a document conveyed by the roller, and a control unit configured to control driving of the DC motor. The control unit is configured to detect a power load value of the DC motor. The control unit is configured to determine that the power load value of the DC motor exceeds a first threshold value in a state in which the control unit controls the DC motor to convey the document at a first conveyance velocity, and then, control the DC motor to convey the document at a second conveyance velocity lower than the first conveyance velocity.