Ink Supply Control for Printer Sub-Tank Reliability
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Solution Overview
Problem
Existing inkjet printers face challenges in managing ink levels between sub-tanks and main tanks, leading to potential ink shortages due to variations in ink supply amounts, which are not adequately addressed by existing systems.
Innovation Solution
A recording apparatus with a control unit that calculates the estimated consumption of ink in the sub-tank by considering the minimum tolerance of the supply amount, ensuring that the actual ink supply from the main tank to the sub-tank is sufficient to prevent shortages, and includes features like sensor detection for optimal ink management and user interface prompts for replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ink supply amount is calculated without considering tolerance variation, then the calculation is simple, but the actual ink supply may be insufficient leading to ink shortage
Solution Approach 1:
The control unit performs preliminary action by calculating the estimated consumption amount using the minimum value of tolerance before actual ink supply occurs. This advance calculation ensures that the ink supply amount is sufficient even when actual supply varies, preventing ink shortage while maintaining manageable complexity through proactive planning.
Solution Approach 2:
The control unit applies beforehand cushioning by incorporating the minimum tolerance value into the consumption calculation, creating a safety buffer. This cushioning effect ensures that even if actual ink supply is at the lower end of the tolerance range, the sub tank will not run out of ink, thus improving reliability without significantly increasing complexity.
2Reliability
If ink is supplied frequently to account for supply variation, then ink shortage is prevented, but the frequency of replenishment operations increases
Solution Approach 1:
The control unit uses feedback by continuously monitoring the actual ink supply amount and comparing it with the calculated estimated consumption amount. Based on this feedback, the system adjusts future supply operations, enabling reliable ink supply while optimizing replenishment frequency to maintain printing efficiency.
Solution Approach 2:
The control unit applies parameter changes by dynamically adjusting the ink supply amount based on the minimum tolerance value and actual consumption patterns. This allows the system to maintain reliable ink supply levels while adapting the replenishment frequency to actual needs, thus preserving printing productivity.
3Reliability
If the ink supply amount is overestimated to prevent shortage, then ink availability is ensured, but the container may be overfilled reducing its lifespan
Solution Approach 1:
The control unit performs preliminary calculation of the estimated consumption amount using the minimum tolerance value before initiating ink supply. This advance planning ensures that the sub tank is filled to the appropriate level without overfilling, maintaining ink availability while extending container lifespan through precise, pre-planned supply operations.
Solution Approach 2:
The control unit replaces mechanical estimation with precise calculation based on minimum tolerance values and actual consumption data. This substitution enables accurate determination of the optimal ink supply amount, ensuring reliability while preventing overfilling that would reduce container lifespan.
Data Source
AI summary
A printer has a recording head, a relay container from which ink is supplied to the recording head, and to which the ink is supplied from a terminal container, a pressurizing pump and a depressurizing pump for supplying the ink from the terminal container to the relay container, and a control unit. The control unit calculates an estimated consumption amount of the relay container based on the amount of the ink supplied from the relay container to the recording head, and consumed and the amount of the ink supplied from the terminal container to the relay container, and calculates the amount of the ink supplied from the terminal container to the relay container using the minimum value of tolerance of a supply amount of the depressurizing pump.