Sheet Conveyance Motor Holding Control Against Reverse Rotation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printers face issues with sheets being returned in the opposite direction due to external forces on the conveyance mechanism, leading to print quality degradation, as the motor output may be insufficient or excessive when holding at a stop position.
Innovation Solution
A control method that adjusts the motor output for holding control based on the previous output value, using a calculated difference or ratio to account for external forces, ensuring appropriate motor torque during sheet stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor output is increased to prevent reverse rotation, then the reliability of holding position is improved, but the manufacturing precision deteriorates due to excessive motor rotation forward from the stop position
Solution Approach 1:
The patent applies dynamics by making the motor output value changeable based on operational conditions. The holding control dynamically adjusts the motor output value according to the magnitude of external forces detected during conveyance, allowing the system to adapt between preventing reverse rotation and avoiding excessive forward rotation differentially for each stopping operation.
Solution Approach 2:
The patent changes the parameter of motor output value based on the relationship between external forces and conveyance speed. By adjusting this parameter according to measured conditions, the system optimizes the balance between holding reliability and positioning precision for each specific operational context.
2Manufacturing precision
If the motor output is decreased to improve stop position precision, then the manufacturing precision is improved, but the reliability deteriorates as the motor cannot hold position against external forces
Solution Approach 1:
The system dynamically determines the motor output value based on real-time conditions including external force magnitude and conveyance speed. This allows the motor output to be optimized for each specific stopping scenario, achieving both precision and reliability where a fixed output value would fail.
Solution Approach 2:
The motor output value parameter is adjusted based on the relationship between external forces and conveyance speed. This parameter change enables the system to achieve precise positioning while maintaining sufficient holding force against external disturbances.
3Device complexity
If a fixed motor output value is used for holding control, then the device complexity is reduced, but the adaptability deteriorates as the output cannot adjust to varying external forces
Solution Approach 1:
The patent implements feedback by measuring the relationship between external forces and conveyance speed, then using this information to determine the appropriate motor output value for holding control. This feedback mechanism enables the system to adapt to varying external forces while maintaining reasonable control complexity.
Data Source
AI summary
A printing apparatus includes a printing unit configured to perform printing on a sheet, a conveying unit configured to convey a sheet to a print position of the printing unit, a motor configured to drive the conveying unit, and a control unit configured to control rotation of the motor. The control unit is capable of executing holding control of holding the motor at a stop position. The control unit is configured to determine a second output value, which is an output value of the motor in the holding control, in accordance with a first output value, which is an output value of the motor before stopping at the stop position.