Image Feeding Velocity Control for Transfer Position Accuracy
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Solution Overview
Problem
Conventional image forming apparatuses face errors in transferring images due to abrasion and slip between rollers and the printing medium, leading to incorrect transfer positions and potential loss of information.
Innovation Solution
An image forming apparatus with a controller that adjusts the feeding motor's frequency based on actual versus reference times to maintain consistent image transfer, using a lookup table to compensate for variations in feeding velocity and time, ensuring accurate image placement on the printing medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the transfer position is determined based on preset feeding velocity and distance, then the image transfer process is simple, but errors occur due to roller abrasion and slip
Solution Approach 1:
The patent applies feedback by measuring the actual time taken for the printing medium to travel from the registration sensor to the transfer position, then using this measured time to calculate and adjust the actual feeding velocity. This closed-loop feedback mechanism compensates for errors caused by roller abrasion and slip, ensuring accurate transfer position determination despite changes in feeding conditions.
Solution Approach 2:
The patent changes the parameter used for transfer position determination from a fixed preset velocity to a dynamically calculated actual velocity based on measured time. By updating the velocity parameter according to actual feeding conditions, the system maintains high transfer position accuracy while adapting to roller wear and slip variations.
2Device complexity
If the feeding velocity is kept constant, then the control system is simple, but transfer position errors increase due to roller wear and slip
Solution Approach 1:
The system implements feedback control by continuously monitoring the actual time taken for the printing medium to reach the transfer position and adjusting the feeding velocity calculation accordingly. This ensures reliable transfer position even when roller wear or slip causes deviations from the intended feeding path.
Solution Approach 2:
The patent transitions from static preset velocity to dynamic velocity calculation based on actual measured time. The system adapts the feeding velocity parameter in real-time according to actual conditions, improving reliability while maintaining manageable control complexity through time-based adjustment rather than complex mechanical modifications.
3Productivity
If the transfer position is determined without time measurement, then the system is faster, but information loss occurs due to incorrect transfer positions
Solution Approach 1:
The patent uses time measurement feedback to determine the actual feeding velocity, which then ensures accurate transfer position calculation. This feedback mechanism prevents information loss by verifying that the printing medium is at the correct position before transfer, thereby maintaining both speed and accuracy.
Solution Approach 2:
The system performs preliminary time measurement to calculate the actual feeding velocity before initiating the transfer process. This preliminary action ensures that the transfer position is accurately determined based on actual feeding conditions, preventing missed transfers and information loss while maintaining efficient processing speed.
Data Source
AI summary
An method of controlling a feeding velocity of a printing medium in an image forming apparatus, and an image forming apparatus to perform the method, the method including sensing a time between two points on a feeding path on which the printing medium is moving, and regulating the feeding velocity of the printing medium according to the sensed time.