Roll Transport Tension Control for Inertial Compensation
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Solution Overview
Problem
As the size of transport devices increases, the diameter of the roll body held by the holding unit increases, leading to higher inertial forces during rotation, which reduces the accuracy of medium transport control using the driving force applied to the holding unit.
Innovation Solution
A transport device and printing apparatus that include a holding unit, a transport unit, a tension applying unit, a driving portion, and a control unit, where the control unit adjusts the driving force based on load detection to maintain optimal tension and reduce the influence of inertial forces, using a supply bar member and guide bar member to apply tension between the holding and transport units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of the roll body is increased to accommodate larger transport devices, then the capacity and size of the transport device are improved, but the inertial forces during rotation increase, reducing the accuracy of medium transport control
Solution Approach 1:
The system divides the control function into two independent parts: the holding unit controls the roll body rotation, while the tension applying unit separately controls the medium tension. This segmentation allows each unit to be optimized independently, resolving the contradiction between large roll capacity and precise transport control.
Solution Approach 2:
The tension applying unit acts as an intermediary between the holding unit and the medium. It applies controlled tension to the medium, compensating for the inertial effects of large roll bodies and enabling precise transport control independent of roll size.
2Reliability
If the diameter of the roll body is increased, then the capacity of the transport device is improved, but the inertial forces during rotation increase, leading to reduced control accuracy
Solution Approach 1:
The tension applying unit provides a counteracting force to balance the inertial forces generated by large roll bodies. By applying controlled tension, it compensates for inertial effects and maintains stable, accurate transport control regardless of roll size.
Solution Approach 2:
The load detector provides real-time feedback on the load applied to the transport unit, and the control unit adjusts the tension applying unit accordingly. This feedback mechanism enables dynamic compensation for inertial forces, maintaining high control accuracy even with large roll bodies.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the accuracy of medium transport by compensating for inertial forces, ensuring precise control and reducing the impact of roll body inertia, thereby improving transport reliability and adaptability to different medium types.
Implementation Method 1
a tension applying unit configured to press the medium between the holding unit and the transport unit to apply tension to the medium
Implementation Method 2
a detector configured to detect a load applied to the transport unit
Implementation Method 3
the inertial at the time of causing the roll body to rotate also increases. This inertial leads to a reduction in the accuracy of controlling transport of the medium using the driving force applied to the holding unit
Data Source
AI summary
Provided are: a holding unit configured to rotatably hold a roll body on which a medium is wound; a transport unit configured to transport the medium unwound from the roll body; a tension applying unit configured to press the medium between the holding unit and the transport unit to apply tension to the medium; a driving portion configured to provide driving force to the tension applying unit; a control unit configured to control the transport unit and the driving portion; and a detector configured to detect a load applied to the transport unit, and the control unit controls the driving force by the driving portion on the basis of the load detected by the detector to adjust the tension applied to the medium.