Liquid Ejecting Head Positioning with Segmented Contact Regions
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Solution Overview
Problem
Existing liquid ejecting heads are difficult to easily attach and detach from support bodies, necessitating improved positioning mechanisms for efficient assembly and disassembly.
Innovation Solution
The liquid ejecting head and support body incorporate first and second positioning pins and corresponding positioning portions, with a virtual cylinder model defining contact regions to facilitate secure attachment and detachment, utilizing a first virtual cylinder with specific contact regions to enhance stability and ease of handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a positioning pin is inserted into a positioning portion to attach the liquid ejecting head to the support body, then positional accuracy is improved, but ease of operation deteriorates due to difficulty in attachment and detachment
Solution Approach 1:
The positioning portion is divided into multiple regions (first, second, and third regions) along the depth direction, with each region serving a specific function: the first and second regions provide contact surfaces for secure positioning, while the third region acts as a non-contact zone that facilitates easy detachment by allowing the positioning pin to be pulled out without friction interference
Solution Approach 2:
The third region serves as an intermediary zone between the contact regions, creating a gap that mediates the transition between attached and detached states. This non-contact region allows the positioning pin to move freely during detachment without being constrained by friction from the positioning portion walls
Data Source
AI summary
A liquid ejecting head includes a first-positioning-portion into which a first-positioning-pin of a support body is inserted. When a virtual cylinder inserted to a deepest position of the first-positioning-portion and having a maximum cross-sectional area when viewed in a first-direction which is a depth direction of the first-positioning-portion is defined as a first-virtual-cylinder, a side surface of the first-virtual-cylinder includes a first-region, a second-region, and a third-region disposed between the first-region and the second-region. The first-region contacts with the first-positioning-portion on a first-side which is one side in a second-direction orthogonal to the first-direction, and does not contact with the first-positioning-portion on a second-side which is the other side in the second-direction. The second-region does not contact with the first-positioning-portion on the first-side, and contacts with the first-positioning-portion on the second-side. The third-region does not contact with the first-positioning-portion on both the first-side and the second-side.