Transport Device Dynamic Interval Control
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Solution Overview
Problem
Printing apparatuses face challenges in maintaining calculation accuracy of transport amounts during intermittent medium transport due to varying transport speeds and increased calculations during low-speed periods, leading to reduced accuracy and complexity in control configurations.
Innovation Solution
A transport device with a control unit that divides the transport period into segments, adjusting the length of these segments based on transport speed, and adjusting the imaging interval to prevent calculation errors, particularly during acceleration, constant speed, and deceleration phases, ensuring accurate calculation of transport amounts without complicating the control configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transport period is divided into multiple periods with equal intervals for calculating transport amount, then the calculation process is simple, but the calculation accuracy is reduced during low-speed periods due to increased number of calculations
Solution Approach 1:
The patent applies dynamics by making the divided period length variable rather than fixed. The control unit adjusts the length of each divided period based on the transport speed detected during the transport period. When transport speed is high, shorter divided periods are used; when transport speed is low, longer divided periods are used. This dynamic adjustment resolves the contradiction by adapting the calculation interval to the actual transport conditions, maintaining calculation accuracy while preserving operational simplicity.
2Measurement precision
If the imaging interval is shortened to increase calculation frequency during low-speed periods, then calculation accuracy improves, but the control configuration becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the imaging interval based on transport speed conditions. The control unit detects transport speed and dynamically adjusts the imaging interval parameter: using shorter intervals during low-speed periods to improve calculation accuracy, and longer intervals during high-speed periods to reduce processing load. This parameter adaptation resolves the contradiction by optimizing the imaging interval to match operational conditions without requiring complex control configurations.
3Measurement precision
If the number of calculations is increased during low-speed periods to maintain accuracy, then calculation precision improves, but the processing time increases
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the divided period length based on transport speed. During low-speed periods where higher calculation frequency would normally be needed for accuracy, the system uses longer divided periods to reduce the total number of calculations. During high-speed periods, shorter divided periods are used. This dynamic approach resolves the contradiction by optimizing the balance between calculation accuracy and processing time according to actual transport conditions.
Data Source
AI summary
A printing apparatus includes a control unit that calculates a transport amount (an actual transport amount) during a transport period based on a captured image of a medium by an imaging unit and controls a transport unit. In addition, the control unit calculates the transport amount (the actual transport amount) during the transport period by calculating the transport amount at each calculation interval (a divided transport amount) and integrating the transport amount at each calculation interval (the divided transport amount). Then, the control unit causes the calculation interval to be longer in a case where the transporting speed of the medium is low than in a case where the transporting speed of the medium is high.