Variable Diameter Biasing Member for Inkjet Pressure Control
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Solution Overview
Problem
The existing pressure controlling apparatuses for liquid ejecting systems, such as inkjet printers, face issues with the buckling of biasing members due to the pressure applied by the moving pressure receiving plate, leading to variations in channel resistance and errors in ink ejection.
Innovation Solution
A pressure controlling apparatus is designed with a biasing member that has a larger diameter at one portion in contact with the pressure receiving plate and a smaller diameter closer to the seat, reducing the likelihood of buckling and maintaining stability, and can have a constant diameter over its length for simplicity in production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the biasing member has a small diameter to reduce space occupation, then the structure becomes more compact, but the biasing member becomes susceptible to buckling under pressure
Solution Approach 1:
The biasing member features a variable diameter structure where the first portion has a larger diameter than the second portion. This local quality variation allows the first portion to resist buckling under pressure while the overall structure remains compact, resolving the contradiction between space occupation and buckling resistance.
2Ease of manufacture
If the biasing member has a constant small diameter, then the manufacturing process is simplified, but the stability under pressure is compromised
Solution Approach 1:
The biasing member is designed with different diameters at different portions, where the first portion has a larger diameter for stability and the second portion has a smaller diameter. This local differentiation maintains manufacturing simplicity while improving structural stability under pressure.
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 configuration reduces the likelihood of buckling, stabilizes the biasing member, and minimizes errors in pressure control, ensuring consistent ink ejection by maintaining consistent channel resistance.
Implementation Method 1
a biasing member disposed between the pressure receiving plate and the seat and configured to bias the pressure receiving plate
Implementation Method 2
a pressure receiving plate configured to move with a change in pressure in the second space
Data Source
AI summary
A pressure controlling apparatus includes a seat having a communication hole through which a first space and a second space, in which a liquid flows, are in communication with each other, a pressure receiving plate configured to move with a change in pressure in the second space, a valve member configured to open and close the communication hole in conjunction with the movement of the pressure receiving plate, and a biasing member disposed between the pressure receiving plate and the seat and configured to bias the pressure receiving plate. The biasing member includes a first portion in contact with the pressure receiving plate and a second portion positioned closer than the first portion to the seat. The first portion has a larger diameter than the second portion.