Liquid Discharge Device Adaptive Maintenance Control
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Solution Overview
Problem
Liquid discharge devices, such as printers, face challenges in effectively removing air bubbles during maintenance, especially when the consumption of liquid is low, leading to inadequate maintenance and potential reliability issues.
Innovation Solution
A liquid discharge device with a control unit that performs varying levels of maintenance based on the consumption amount since the previous maintenance, including first and second maintenance types, and also considers unused time and user instructions, to address air bubble growth and ensure reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If maintenance is performed based only on time elapsed since previous maintenance, then maintenance scheduling is simple, but air bubbles cannot be sufficiently ejected when liquid consumption is small
Solution Approach 1:
The maintenance intensity is dynamically adjusted based on liquid consumption amount. The control unit determines whether to perform first maintenance (standard intensity) or second maintenance (higher intensity) by comparing the liquid consumption amount against a threshold, allowing the maintenance strategy to adapt to actual usage conditions rather than following a fixed time-based schedule
Solution Approach 2:
The system incorporates feedback from liquid consumption monitoring to adjust maintenance decisions. The control unit continuously tracks the liquid consumption amount since the last maintenance operation and uses this information to determine the appropriate maintenance intensity, creating a closed-loop control system that responds to actual device usage patterns
2Reliability
If stronger maintenance is always performed, then air bubbles are effectively ejected, but liquid consumption increases
Solution Approach 1:
The maintenance intensity parameter is changed based on liquid consumption conditions. When liquid consumption exceeds a threshold, the system performs first maintenance with standard intensity; when consumption is below the threshold, the system performs second maintenance with higher intensity. This parameter adjustment optimizes the balance between maintenance effectiveness and liquid consumption
Solution Approach 2:
The system applies partial action (standard intensity maintenance) when liquid consumption is high, and excessive action (higher intensity maintenance) when liquid consumption is low. This selective approach ensures adequate air bubble removal while avoiding unnecessary liquid consumption during periods of high usage
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
The solution improves maintenance reliability by adapting maintenance intensity to consumption levels and unused time, reducing the risk of air bubble-related issues and allowing user-specified maintenance, thereby enhancing the device's operational stability.
Implementation Method 1
The suction pump performs recovery operation, which is an example of maintenance, by creating a negative pressure in the capping means that caps the recording head
Data Source
AI summary
A liquid discharge device includes a discharge unit configured to discharge liquid, a maintenance unit configured to cause the discharge unit to eject liquid to perform maintenance of the discharge unit, and a control unit configured to cause the maintenance unit to perform the maintenance periodically, wherein when performing the maintenance, the control unit performs first maintenance in a case in which a consumption amount of the liquid consumed after the maintenance previously performed is greater than or equal to a first threshold value, and performs second maintenance stronger than the first maintenance in a case in which the consumption amount is less than the first threshold value.