Droplet Ejection Head Metal Plate Orientation
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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 discarding of material when stamped to fit a predetermined width.
Innovation Solution
The droplet ejection head is designed with metal plates whose lengthwise directions form different angles with the rolling direction, preventing bending by alternating layers of plates with internal stress aligned in perpendicular directions, thereby improving dimension accuracy and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If metal plates are stamped from a roll with lengthwise direction aligned with rolling direction to reduce material loss, then material utilization is improved, but the metal plates bend along their lengthwise direction due to internal stress release
Solution Approach 1:
The patent applies asymmetry by orienting metal plates at different angles relative to the rolling direction. Specifically, odd-numbered plates are oriented at a first angle while even-numbered plates are oriented at a second angle (perpendicular to the first), creating an asymmetric pattern that prevents uniform bending across the layered body while maximizing material utilization from the roll.
Solution Approach 2:
The patent changes the orientation parameter of adjacent metal plates. By alternating the angular orientation of consecutive plates (first angle for odd plates, second angle for even plates), the internal stress distribution is modified to prevent cumulative bending effects while maintaining efficient material usage from the rolled sheet.
2Ease of manufacture
If all metal plates in the layered body are oriented with the same rolling direction, then manufacturing process is simplified, but the layered body bends along its lengthwise direction deteriorating dimension accuracy
Solution Approach 1:
The patent introduces asymmetry in the orientation of adjacent metal plates within the layered body. Odd-numbered plates are oriented at a first angle to the rolling direction while even-numbered plates are oriented at a second angle (perpendicular to the first). This asymmetric arrangement prevents the layered body from bending uniformly while maintaining a relatively simple manufacturing process through systematic alternating orientation.
Solution Approach 2:
The patent applies local quality by giving different orientation characteristics to different regions of the layered body. Each plate's orientation is locally optimized relative to its neighbors, with odd plates having one orientation and even plates having a perpendicular orientation, creating a distributed stress balance that prevents overall bending.
3Loss of substance
If metal plates are stamped to fit a predetermined width from a roll, then material waste is reduced, but internal stress is partially released causing the plates to bend largely
Solution Approach 1:
The patent uses asymmetry to counteract the bending caused by internal stress release. By orienting adjacent plates at perpendicular angles to the rolling direction, the bending tendencies of individual plates are distributed and counterbalanced across the layered structure, maintaining effective rigidity while minimizing material waste through efficient roll utilization.
Solution Approach 2:
The patent applies the counterweight principle by using the orientation of adjacent metal plates to counterbalance the bending forces. When one plate bends due to internal stress release, the perpendicular orientation of the adjacent plate creates a counteracting effect, preventing cumulative bending and maintaining structural rigidity.
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 design effectively restrains the layered body from bending, enhancing the dimension accuracy and rigidity of the droplet ejection head, ensuring uniform ejection energy and improved ink droplet ejection characteristics.
Implementation Method 1
the metal plate may largely bend because internal stress is partially released
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 in which at least a part of a liquid passage is formed, and an ejection face in which an ejection port provided at one end of the liquid passage and ejecting an ink droplet is formed. The plurality of metal plates in the layered body include m metal plates whose lengthwise directions form the same angle with a rolling direction thereof, and n metal plates whose lengthwise directions form the same angle with the rolling direction. The angle formed between the lengthwise direction of the m metal plates and the rolling direction is different from the angle formed between the lengthwise direction of the n metal plates and the rolling direction.