Printing Apparatus Conveyance Control for Fluctuation Suppression
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Solution Overview
Problem
Conveyance accuracy in printing apparatuses is compromised when switching between single and dual roller conveyance states due to bending and decentering issues, leading to fluctuations in conveyance amount and image quality.
Innovation Solution
A control unit recursively calculates the load acting on conveyance rollers in the second conveyance state, setting an initial value to 0, and adjusts the driving unit to suppress conveyance amount fluctuations during state transitions, using conveyance amount information and formulas to correct for bending and decentering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conveyance state switching is implemented to control printing medium transport, then conveyance flexibility is improved, but conveyance amount accuracy deteriorates due to bending release and roller decentering
Solution Approach 1:
The control unit performs preliminary correction calculations before conveyance state switching occurs. By recursively calculating the load on the downstream roller and determining the conveyance amount correction value in advance, the system prepares compensation values that will be applied when switching between single-roller and dual-roller conveyance states, thereby preventing conveyance amount fluctuations caused by bending release
Solution Approach 2:
The system implements a feedback mechanism where the control unit continuously monitors conveyance state transitions and recursively calculates load changes on the rollers. Based on this feedback information about the current conveyance state and roller loads, the control unit dynamically adjusts conveyance amount corrections to compensate for bending effects and maintain accurate positioning during state switching
2Ease of manufacture
If roller outer diameter variation and decentering are present, then manufacturing cost is reduced, but conveyance amount accuracy deteriorates
Solution Approach 1:
The control unit dynamically changes operational parameters by recursively calculating the actual load on each roller based on conveyance state and medium properties. Instead of requiring precise mechanical manufacturing, the system adjusts conveyance amount parameters in real-time based on calculated roller loads and bending states, compensating for manufacturing variations through software-based parameter optimization
Solution Approach 2:
The invention replaces mechanical precision requirements with computational correction. Rather than relying on precisely manufactured rollers with consistent outer diameters and perfect centering, the system uses recursive load calculations and software-based conveyance amount corrections to compensate for mechanical imperfections, substituting computational complexity for mechanical precision
3Manufacturing precision
If bending correction based on conveyance amount difference is applied, then conveyance accuracy is improved, but response delay in bending occurrence is not accounted for
Solution Approach 1:
The control unit performs preliminary recursive load calculations that anticipate bending effects before they fully manifest. By calculating the load on the downstream roller and determining correction values in advance of state switching, the system accounts for the time delay in bending occurrence and applies corrections proactively rather than reactively
Solution Approach 2:
The system implements continuous feedback monitoring of conveyance state and recursive load calculation to detect bending occurrence timing. By monitoring the relationship between conveyance amount differences and roller loads in real-time, the control unit identifies when bending begins to occur and adjusts corrections dynamically, accounting for the response delay between conveyance state change and bending manifestation
Data Source
AI summary
A printing apparatus includes a printing unit, a first and second conveying units conveying a printing medium, a driving unit driving the conveying units and a control unit controlling the driving unit. A load mutually acting on the conveying units through the medium in a conveyance state by the conveying units is recursively calculated for each predetermined conveyance unit while setting the initial value to 0. The driving unit is controlled based on the calculation result at the time of the transition to suppress a fluctuation in a conveyance amount at the time of the transition of the conveyance state of the medium from the conveyance state by the conveying units to a conveyance state only by the second conveying unit.