Ink Cartridge Detection Control for Accurate Level Monitoring
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Solution Overview
Problem
Inkjet printing apparatuses face issues with detecting the remaining state of ink in cartridges when the cartridge and detection unit are not in a predetermined positional relationship, leading to potential blank printing due to incomplete ink detection.
Innovation Solution
A control method that performs forced detection control by moving the ink cartridge and detection unit to the predetermined positional relationship, ensuring accurate detection of the remaining ink state, even when the printing pattern prevents direct alignment, by utilizing a control unit that determines the positional relationship with each printing pass and executes forced detection when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ink cartridge follows the printing pattern without forced detection alignment, then printing efficiency is maintained, but the remaining ink state cannot be detected accurately
Solution Approach 1:
The system performs preliminary detection of the positional relationship between the ink cartridge and detection unit before printing. When the cartridge is predicted to pass through the detection position, detection is enabled in advance, ensuring accurate ink level measurement before printing operations begin
Solution Approach 2:
The system dynamically adjusts the detection strategy based on the printing pattern and cartridge movement. Forced detection control is activated only when necessary (when the cartridge is predicted to pass through detection position), while normal printing operations proceed without interruption, creating a dynamic balance between detection accuracy and printing efficiency
2Reliability
If forced detection control is performed frequently to ensure accurate detection, then ink detection reliability improves, but printing productivity decreases
Solution Approach 1:
The system applies forced detection control partially - only when the ink cartridge is predicted to pass through the detection position during printing operations. This selective application ensures detection reliability is maintained when needed, while avoiding excessive forced detection that would reduce printing productivity
Solution Approach 2:
The control unit continuously monitors the positional relationship between the ink cartridge and detection unit, using feedback from the printing pattern and cartridge movement to determine when forced detection control should be activated. This feedback mechanism ensures detection reliability without unnecessary interruptions to printing
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 approach ensures reliable detection of the remaining ink state, preventing blank printing by aligning the cartridge and detection unit during printing, even when the printing pattern obstructs direct alignment, thereby maintaining print quality.
Implementation Method 1
the light emitted from the light-emitting unit is fully reflected at an inner surface of the optical path member, and the fully-reflected light is then detected by a light-receiving unit
Implementation Method 2
an optical path member (a prism) for detecting an amount of ink... an optical path member having a refractive index near that of ink is provided in an ink cartridge
Data Source
AI summary
A printing apparatus includes a liquid receptacle, a head, a driving unit for the head, a detection unit that detects a remaining state of a liquid, and a control unit that controls the driving unit and, in the case where the liquid receptacle and the detection unit are in a predetermined positional relationship, determines whether or not there is liquid remaining in the liquid receptacle based on a detection signal from the detection unit. In the case where the control unit has determined that greater than or equal to a specified value of the liquid in the liquid receptacle has been consumed without the liquid receptacle and the detection unit arriving at the predetermined positional relationship, the control unit performs forced detection control that sets the liquid receptacle and the detection unit to the predetermined positional relationship and causes the detection unit to detect the remaining state of the liquid.