Resin-Metal Connection Structure for Ink-Jet Heads
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Solution Overview
Problem
The existing connection structures between resin and metal components in ink-jet heads fail to maintain fixation when environmental temperature changes, leading to disengagement and ink leakage due to differences in heat expansion.
Innovation Solution
A connection structure using a stepped screw with a head, a cylinder part, and a male screw part, where the convex of the resin component is pressed and deformed during screwing, applying force in the opposite direction to secure the components, ensuring they remain fixed despite temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rubber pad is interposed between the head of the stepped screw and the resin component to relieve stress during screwing, then stress concentration on the resin component is reduced and cracks are prevented, but when environmental temperature changes cause difference in heat expansion between components, the thickness is reduced and disengagement occurs at the resin component, so the two components are not fixed to each other
Solution Approach 1:
The invention extracts the rubber pad from the screwing process and replaces it with a convex structure formed directly on the resin component. This convex structure contacts the screw head and provides the necessary stress relief without the disengagement problem of the rubber pad, thereby maintaining both stress relief capability and fixation stability.
Solution Approach 2:
The convex structure on the resin component serves as an intermediary between the screw head and the resin component. It provides a contact surface that relieves stress during screwing while maintaining reliable fixation under temperature changes, eliminating the need for separate rubber pads.
2Ease of manufacture
If the cylinder part of the stepped screw has the same axial length as the line segment from the convex to the second surface, then the screwing process is simplified and the components are easily assembled, but the fixation strength may be insufficient to maintain connection under temperature changes
Solution Approach 1:
The invention applies local quality by creating a convex structure with specific geometric properties at the critical contact area between the screw head and resin component. The convex structure has a specific radius of curvature and dimensional relationship with the cylinder part that provides both easy assembly and sufficient fixation strength under temperature changes.
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 structure maintains the fixation between resin and metal components even with temperature changes, reducing ink leakage and ensuring smooth ink supply to the nozzles.
Implementation Method 1
the convex of the resin component is pressed and deformed during screwing, applying force in the opposite direction to secure the components
Implementation Method 2
when there occurs a difference of heat expansions between the components due to a change in environmental temperature
Data Source
AI summary
The first passage component and the second passage component are fixed with each other as the male screw part is screw-engaged with the female screw hole while the cylinder part is inserted into the through-hole. The second passage component has a convex contacting the head and a spaced surface spaced apart from the head in the axial direction, both in a first annular confronting area confronting the head of the stepped screw, at a surrounding of the through-hole of the third surface. The axial length of the cylinder part is same as the length of a line segment extending to the second surface from the leading end of the convex in the axial direction, while the axial length of the cylinder part is smaller than the length of the line segment until the male screw part is screw-engaged with the female screw hole.