Medium Feeding Apparatus Effective Tension Control
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Solution Overview
Problem
Existing medium feeding apparatuses struggle to accurately control the slipping amount of a medium with respect to a feeding roller, leading to deviations in the desired feeding amount, even when target tension is achieved, due to low correlativity between calculated tension and slipping amount.
Innovation Solution
A medium feeding apparatus that calculates and controls effective tension by weighting multiple tensions with corresponding feeding amounts, acquired during pre-feeding operations, to enhance correlativity with slipping amounts, thereby accurately controlling the feeding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If average tension and peak tension are used to calculate tension for feedback control, then the control system is simple to implement, but the correlativity between calculated tension and slipping amount is low
Solution Approach 1:
The patent performs a pre-feeding operation before the actual feeding operation to acquire multiple feeding amounts at different acquiring timings. This preliminary data collection enables the subsequent calculation of effective tension with high correlativity to slipping amount, resolving the contradiction by preparing accurate measurement data in advance.
Solution Approach 2:
The patent changes the parameter calculation method from simple average/peak tension to effective tension that incorporates multiple feeding amounts and their corresponding timings. The effective tension is calculated by weighting tensions with corresponding feeding amounts, which improves the correlativity between calculated tension and actual slipping amount while maintaining feedback control functionality.
2Reliability
If target tension is controlled to be achieved, then the tension control function is fulfilled, but the slipping amount of medium deviates from desired slipping amount due to low correlativity
Solution Approach 1:
The patent implements feedback control using effective tension calculated from multiple feeding amounts acquired during pre-feeding operation. The roll motor control portion uses this effective tension to adjust the roll motor output, creating a feedback loop that directly correlates tension control with actual slipping amount, thereby improving feeding amount precision while maintaining tension control reliability.
Solution Approach 2:
The pre-feeding operation collects multiple feeding amounts and corresponding tensions before the actual feeding operation. This preliminary data acquisition enables the calculation of effective tension that has high correlativity with slipping amount, allowing the system to achieve both reliable tension control and precise feeding amount control.
3Measurement precision
If multiple tensions are acquired and weighted with corresponding feeding amounts, then the correlativity with slipping amount is high, but the calculation process becomes more complex
Solution Approach 1:
The system performs preliminary acquisition of multiple feeding amounts and corresponding tensions during a pre-feeding operation. This structured preliminary data collection organizes the measurements in a way that facilitates the subsequent weighting calculation, making the process manageable despite involving multiple parameters.
Solution Approach 2:
The patent introduces feeding amount as an intermediary parameter that connects tension measurement with slipping amount. By weighting tensions with their corresponding feeding amounts, the system creates an effective tension value that mediates between raw tension measurements and actual slipping behavior, improving correlativity while maintaining a systematic calculation approach.
Data Source
AI summary
A medium feeding apparatus includes a feeding roller which feeds a medium unwound from a roll body around which the medium is wound, a roll motor which applies torque for rotating the roll body to the roll body, and a roll control portion which controls the roll motor at the time of a feeding operation based on effective tension calculated by acquiring a feeding amount of the medium fed at each of a plurality of acquiring timings included in a pre-feeding operation, which is a feeding operation performed in advance, acquiring tension applied to the medium between the roll body and the feeding roller between a plurality of the acquiring timings, and weighting a plurality of the acquired tensions with the corresponding feeding amount.