Sheet Transport Control for Motor Saturation and Positioning
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately transporting sheets to a target position and stopping them with high precision due to increased load, leading to errors in velocity switching and inaccurate positioning.
Innovation Solution
A transporting apparatus equipped with a motor, a transporting mechanism, and a control section that detects electric-current saturation phenomena, adjusts the target transporting velocity, and corrects the control sequence to ensure accurate sheet positioning by lowering the target velocity and adjusting the control sequence to suppress electric-current saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor transports the sheet at high velocity according to the first velocity table, then the transporting speed is improved, but the electric current saturates and the transporting load increases
Solution Approach 1:
The patent dynamically switches between first and second velocity tables based on real-time detection of electric current saturation. The control section adjusts the transporting velocity from high (first velocity table) to low (second velocity table) when saturation is detected, and can switch back when conditions improve. This dynamic adaptation resolves the contradiction by allowing high speed operation when possible while preventing saturation when necessary.
Solution Approach 2:
The control section continuously monitors the electric current from the motor and uses this feedback to detect saturation conditions. Based on this feedback, the system automatically switches between velocity tables to maintain reliable operation. The feedback mechanism ensures that the system operates at high speed when current capacity allows, but reduces speed when saturation is detected, thus resolving the speed-reliability contradiction.
2Reliability
If the system switches from the first velocity table to the second velocity table due to increased load, then the electric current saturation is suppressed, but the positioning accuracy deteriorates
Solution Approach 1:
The control section performs preliminary correction of the control sequence before the sheet reaches the target position when velocity table switching is detected. By calculating and applying correction values in advance based on the switching timing and velocity changes, the system compensates for the positioning errors that would otherwise result from switching to a lower velocity table. This preliminary correction action maintains positioning accuracy while still allowing saturation suppression.
Solution Approach 2:
The system changes control parameters by switching between different velocity tables and applying correction values to the control sequence. When saturation is detected, the system transitions from high-velocity parameters (first velocity table) to low-velocity parameters (second velocity table) while simultaneously adjusting timing parameters through correction calculations. This parameter change approach allows the system to suppress saturation while maintaining positioning accuracy through coordinated parameter adjustment.
3Power
If the target transporting velocity is lowered to suppress electric current saturation, then the motor load is reduced, but the sheet cannot be stopped accurately at the target position
Solution Approach 1:
The control section calculates and applies correction values to the control sequence in advance when velocity table switching is detected. These preliminary corrections account for the reduced velocity and adjusted timing, ensuring that the sheet will reach the target position accurately even though the velocity was lowered to suppress motor load. The correction action compensates for the inherent inaccuracy that would result from simply reducing speed.
Solution Approach 2:
The system changes multiple parameters simultaneously: it lowers the target transporting velocity to reduce motor load while also adjusting timing parameters through velocity table switching and correction value application. This coordinated parameter change allows the system to achieve both reduced motor load and maintained stopping accuracy, as the timing adjustments compensate for the reduced speed.
Data Source
AI summary
A transporting apparatus includes a motor, a transporting mechanism which receives a power from the motor and transports the sheet, and a control section which controls the motor in accordance with a predetermined control sequence to make the transporting mechanism transport the sheet up to a target position, and detects an occurrence of an electric-current saturation phenomenon in the motor. When the control section detects the occurrence of the electric-current saturation phenomenon, the control section performs correction of the predetermined control sequence including correction in which a target transporting velocity of the sheet is lowered from a predetermined value determined in the predetermined control sequence, and controls the motor in accordance with the corrected control sequence to make the transporting mechanism transport the sheet so that the sheet is stopped at the target position.