Droplet Ejection Head Layered Body Bending Control
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Solution Overview
Problem
The existing droplet ejection heads with layered metal plates tend to bend along their lengthwise direction, leading to reduced dimension accuracy and rigidity, due to internal stress and wasteful material usage during manufacturing.
Innovation Solution
Incorporating first and second stress plates with internal stress oriented in opposite directions within the layered body of the droplet ejection head, where the lengthwise directions of the metal plates form the same angle with the rolling direction, to counteract bending and improve rigidity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If metal plates are stamped with lengthwise direction along the rolling direction to reduce material loss, then material utilization is improved, but the metal plates bend along the lengthwise direction due to internal stress release
Solution Approach 1:
The patent introduces asymmetric stress distribution by orienting metal plates at different angles (0° and 45°) relative to the rolling direction. This asymmetric angular arrangement creates complementary internal stresses that balance each other out, preventing uniform bending while maintaining material utilization efficiency.
Solution Approach 2:
The patent changes the orientation parameter of metal plates from a uniform alignment (0°) to a multi-angle configuration (0° and 45°). This parameter variation modifies the internal stress distribution pattern, transforming the bending behavior from uncontrolled to balanced, thereby maintaining dimension accuracy without sacrificing material efficiency.
2Stability of the object's composition
If all metal plates in the layered body bend along their lengthwise direction, then internal stress is released, but the passage unit as a whole bends and deteriorates dimension accuracy
Solution Approach 1:
The patent applies counterweight by introducing metal plates oriented at 45° to the rolling direction, which generate internal stresses in a direction opposite to the bending caused by 0° plates. This counterbalancing effect neutralizes the overall bending tendency of the passage unit while allowing individual plates to release their internal stresses.
Solution Approach 2:
The patent applies local quality by assigning different orientations (0° or 45°) to different metal plates within the layered body. This localized variation in plate orientation creates regions with complementary stress characteristics, allowing each region to release stress locally while the overall structure maintains dimensional stability through the combined effect of all regions.
3Ease of manufacture
If metal plates are made easy to bend along the rolling direction for manufacturing convenience, then ease of manufacture is improved, but rigidity and dimensional stability of the finished product deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-orienting metal plates at specific angles (0° and 45°) during the stamping process before assembly. This preliminary angular arrangement builds into the plates complementary internal stress patterns that will automatically counteract bending during operation, allowing easy manufacturing while ensuring subsequent rigidity.
Solution Approach 2:
The patent creates a composite structure by combining metal plates with different orientations (0° and 45°) in a single layered body. This composite configuration leverages the complementary stress characteristics of differently oriented plates to achieve both ease of manufacture and enhanced rigidity, as the combined structure resists bending more effectively than individual plates could alone.
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 effectively restrains bending along the lengthwise direction, enhancing the dimension accuracy and rigidity of the droplet ejection head, ensuring uniform ejection energy and improved ink droplet characteristics.
Implementation Method 1
a first stress plate which is a metal plate having internal stress which forces the metal plate to bend along its lengthwise direction so as to make the metal plate protrude toward a direction in which a droplet is ejected from the ejection port, and a second stress plate which is a metal plate having internal stress which forces the metal plate to bend along its lengthwise direction so as to make the metal plate protrude toward a direction opposite to the direction in which a droplet is ejected from the ejection port
Data Source
AI summary
A droplet ejection head according to the present invention includes a layered body made up of a plurality of metal plates, and an ejection face. The plurality of metal plates in the layered body include n metal plates whose lengthwise directions form the same angle with a rolling direction thereof. The n metal plates include a first stress plate and a second stress plate. The first stress plate has internal stress which forces the metal plate to bend along its lengthwise direction so as to make it protrude toward a ejecting direction. The second stress plate has internal stress which forces the metal plate to bend along its lengthwise direction so as to make it protrude toward a direction opposite to the ejecting direction.