Transport Device Speed Control for Web Paper Tension
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Solution Overview
Problem
Conventional printing apparatuses experience irregular slack or damages in web paper during changes in transportation speed, particularly in decelerating intervals, due to non-uniform speed control.
Innovation Solution
A transport device with a basic shaft transporter and a controller that synchronizes the speed changes of other transporters in divided accelerating and decelerating intervals, along with tension measurement for fine adjustments, to maintain consistent tension and prevent irregularities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transportation speed is increased in the accelerating interval, then the productivity is improved, but the transportation speed becomes non-uniform in the decelerating interval, causing irregular slack or damages in the web paper
Solution Approach 1:
The patent divides the acceleration interval and deceleration interval into multiple divided intervals. The controller separately controls each divided interval, allowing optimized acceleration while ensuring uniform deceleration. This segmentation enables independent optimization of each phase to prevent web paper damage.
Solution Approach 2:
The controller dynamically adjusts the transportation speed of each transporter based on real-time position and tension feedback. During deceleration, the controller ensures uniform speed reduction across all transporters to maintain constant tension and prevent irregular slack or damages in the web paper.
2Productivity
If the transportation speed is changed rapidly, then the productivity is improved, but the tension control becomes difficult, causing irregular slack or damages
Solution Approach 1:
The patent employs tension sensors to continuously monitor web paper tension and feeds this information back to the controller. The controller uses this feedback to dynamically adjust transporter speeds, maintaining constant tension even during rapid speed changes. This feedback mechanism prevents irregular slack or damages while enabling high productivity.
Solution Approach 2:
The controller pre-calculates and sets appropriate acceleration and deceleration rates for each divided interval based on web paper properties and transportation requirements. This preliminary action ensures that speed changes are optimized in advance, maintaining tension control precision while maximizing productivity.
Data Source
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AI summary
Provision is a transport device for a printing medium (WP) along a transportation path. The transport device incluces a plurality of transporting sections (13a,13b,17a,17b) configured to transport the printing medium on the transportation path; a divided accelerating interval setting section configured to set a transportation speed in a divided accelerating interval, the divided accelerating interval corresponding to a time generated by a time in an acceleration interval (IA) where the transportation speed of the printing medium changes from 0 to a given value in accordance with an acceleration rate; a divided decelerating interval setting section configured to set a transportation speed in a divided decelerating interval, the divided decelerating interval corresponding to a time generated by dividing a time in a decelerating interval (DA) where the transportation speed of the printing medium changes from the given value to 0 in accordance with an decelerating rate; a basic shaft transporting section (13b), as one of the plurality of transporting sections (13a,13b,17a,17b), configured to be driven at the transportation speed set for every divided accelerating interval or for every divided decelerating interval and to function as a basic shaft upon transporting the printing medium; and a controller (12) configured to switch the transportation speeds of the transporting sections of the plurality of transporters other than the basic shaft transporting section in synchronization with a switching timing of the divided accelerating interval or the divided decelerating interval by the basic shaft transporting section (13b) so as to increase or decrease the transportation speed of the printing medium (WP).