Conveyance Correction Value Calculation Using Weighted Average
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for correcting conveyance amounts in recording apparatuses require lengthy measurement times, making it difficult to achieve both high accuracy and short measurement times, especially in manufacturing settings where increased costs and user convenience are concerns.
Innovation Solution
A conveyance apparatus using a weighted average of conveyance amounts from multiple rollers to calculate a correction value, reducing the need for extensive measurement across all conveyance states, thereby shortening measurement time while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual measurement is performed in the entire region between the leading edge and trailing edge of the recording medium, then correction accuracy is improved, but measurement time increases
Solution Approach 1:
The patent applies partial action by measuring only at specific positions (leading edge and trailing edge) rather than the entire region. The invention calculates conveyance amounts for intermediate positions by interpolation based on the measured values at the edges, achieving sufficient correction accuracy without the time cost of measuring every position along the conveyance path.
Solution Approach 2:
The patent creates a mathematical model that copies the conveyance behavior across different positions. By measuring at boundary positions and using the measured data to interpolate conveyance amounts at intermediate positions, the system replicates the full conveyance profile without physical measurement at every point.
2Measurement precision
If measurement is performed at all conveyance states, then correction accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent reduces measurement requirements to only essential positions (leading edge and trailing edge conveyance states) while calculating intermediate states through interpolation. This partial measurement approach maintains sufficient correction accuracy for all conveyance conditions without the time and cost of measuring every possible state.
Solution Approach 2:
The system uses mathematical interpolation to copy conveyance characteristics from measured boundary states to unmeasured intermediate states. This allows the manufacturing process to focus only on measuring at critical positions while still obtaining comprehensive correction data for all conveyance scenarios.
3Productivity
If measurement time is shortened, then user stress is reduced and productivity is improved, but correction accuracy may deteriorate
Solution Approach 1:
The patent replaces physical measurement at every position with a mathematical calculation system. By using interpolation algorithms based on measured boundary values, the system substitutes extensive physical measurement with computational estimation, achieving both speed and sufficient accuracy.
Solution Approach 2:
The invention creates a mathematical copy of the conveyance profile through interpolation. Instead of measuring every point physically, the system generates a complete conveyance map by copying and extrapolating from the measured edge positions, maintaining accuracy while dramatically reducing measurement time.
Data Source
AI summary
Based on a conveyance amount in a second conveyance state where a sheet is conveyed by both a first conveyance unit and a second conveyance unit being a conveyance amount obtained by subjecting a conveyance amount in a first conveyance state where the sheet is conveyed only by the first conveyance unit and a conveyance amount in a third conveyance state where the sheet is conveyed only by the second conveyance unit to weighted average with difficulty of slipping of the first or second conveyance unit to the sheet as a weighting coefficient, a remaining conveyance amount is calculated from any two conveyance amounts from among conveyance amounts of the first, the second and the third conveyance states, and a correction value for conveyance is set from the calculated conveyance amount.