Roll Sheet Remaining Amount Estimation Using Dual Measurement
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Solution Overview
Problem
Existing methods for estimating the remaining amount of a roll sheet in printing apparatuses are inaccurate due to the non-proportional relationship between the rotation amount of the roll sheet and the conveyance amount of the printing medium, especially as the roll sheet diameter decreases.
Innovation Solution
A printing apparatus and method that includes a feed mechanism, a conveyance mechanism, a printing unit, a first measurement unit to measure cumulative rotation, a second measurement unit to measure cumulative conveyance, and an estimation unit using the equation R=PF/(π·REV) to estimate the roll sheet diameter, with periodic resets of both cumulative measurements and a filter process to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotation amount of the roll sheet is used to estimate the remaining amount, then the estimation is simplified, but the accuracy deteriorates because the rotation amount and conveyance amount are not proportional when the diameter changes
Solution Approach 1:
The patent changes the estimation parameters from using only rotation amount to using both rotation amount and conveyance amount. By measuring these two parameters and applying the formula R = PF/(π·REV), the system accounts for the changing diameter of the roll sheet, thereby improving estimation accuracy while maintaining reasonable complexity
Solution Approach 2:
The patent implements periodic resetting of the cumulative rotation amount and cumulative conveyance amount. This feedback mechanism ensures that the estimation remains accurate over time by preventing accumulation of measurement errors and adapting to changes in the roll sheet diameter throughout the feeding process
2Measurement precision
If cumulative rotation amount and cumulative conveyance amount are measured continuously, then the remaining amount can be estimated, but measurement errors accumulate over time
Solution Approach 1:
The patent applies periodic resetting of the cumulative rotation amount and cumulative conveyance amount. By periodically resetting these measurements, the system prevents error accumulation while maintaining continuous monitoring capability. This periodic action ensures that the estimation remains accurate throughout the entire operation duration
Data Source
AI summary
A rebel printer includes an estimation unit that estimates a remaining amount of a roll sheet based on R=PF/(π·REV) (Equation (1)). A first measurement unit resets the measured cumulative rotation amount each time the remaining amount of the roll sheet is estimated or each time the remaining amount of the roll sheet is estimated multiple times, A second measurement unit resets the measured cumulative conveyance amount each time the remaining amount of the roll sheet is estimated or each time the remaining amount of the roll sheet is estimated multiple times, and the estimation unit performs a filter process on A diameter of the roll sheet calculated using the Equation (1), and estimates the diameter subjected to the filter process as the remaining amount of the roll sheet.