Printer Roll Conveyance Control for Inertia Management
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Solution Overview
Problem
In printers with roll paper mechanisms, the effects of inertia due to imperfect alignment of the roll paper's rotation axis, especially with large roll diameters, lead to reduced motor responsiveness and control accuracy, making it difficult to maintain constant tension and proper conveyance of the medium during printing.
Innovation Solution
A printer configuration with a roll driving mechanism, a first conveying mechanism, a second conveying mechanism between the roll and the first mechanism, and a controller that adjusts the operation of these mechanisms to minimize the impact of inertia by controlling the differences in medium conveyance and maintaining optimal slackness, ensuring consistent tension and accurate conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a large roll diameter is used for printing, then the printing capacity is improved, but the effect of inertia due to imperfect alignment of the rotation axis increases, reducing motor responsiveness and control accuracy
Solution Approach 1:
A second conveying mechanism is introduced as an intermediary between the roll driving mechanism and the first conveying mechanism. This intermediate mechanism acts as a buffer that isolates the downstream conveying system from the inertial effects of the large-diameter roll, thereby maintaining control accuracy while preserving the benefits of large roll diameter for printing capacity.
Solution Approach 2:
The conveying system is divided into multiple independent segments: a roll driving mechanism, a second conveying mechanism, and a first conveying mechanism. Each segment can be controlled independently, allowing the system to compensate for inertial effects in the roll segment without affecting the overall conveying precision, thus resolving the contradiction between large roll diameter and control accuracy.
2Duration of action of moving object
If the roll diameter changes due to medium consumption, then the printing process continues, but the amount of rotation of the roll paper is not appropriately controlled, making it difficult to maintain constant tension
Solution Approach 1:
The controller monitors the rotation amounts of both the roll driving mechanism and the first conveying mechanism, and adjusts the operation of the second conveying mechanism based on the difference between these rotation amounts. This feedback control ensures that constant tension is maintained on the medium throughout the printing process, even as the roll diameter changes due to medium consumption.
Solution Approach 2:
The system dynamically adjusts the operation of the second conveying mechanism in response to changing roll diameter. By making the conveying mechanism adaptable and responsive to real-time conditions, the system maintains tension consistency throughout the entire printing duration despite the roll paper being consumed.
3Volume of moving object
If the effect of inertia increases due to imperfect alignment, then the roll diameter is large, but the responsiveness of the motor during acceleration or deceleration declines
Solution Approach 1:
The second conveying mechanism serves as a mediator that decouples the inertial effects of the large-diameter roll from the motor control system. This intermediary allows the motor to accelerate and decelerate responsively without being burdened by the significant inertia of the large roll, thereby maintaining motor responsiveness while preserving large roll diameter benefits.
Data Source
AI summary
A printer includes a roll driving mechanism for causing a roll to rotate and a medium to be conveyed, a roll driving section for driving the roll driving mechanism, a first conveying mechanism for conveying the medium, a first driving section for driving the first conveying mechanism, a second conveying mechanism for conveying the medium, and a second driving section for driving the second conveying mechanism, and a controller for performing a control in such a way that when there is a change in the rate at which the first conveying mechanism conveys the medium, the maximum amount of the difference between the amount of the medium conveyed by the roll driving mechanism and the amount of the medium conveyed by the second conveying mechanism exceeds the maximum amount of the difference.