Liquid Ejecting Head Dual-Thread Shaft Fixation
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Solution Overview
Problem
Existing liquid ejecting apparatuses face challenges in efficiently fixing and positioning liquid ejecting heads due to the need for both screwing processes from one side and the other side, which complicates production and repair, especially when dealing with densely packed nozzles and varied fixation requirements.
Innovation Solution
The design incorporates a liquid ejecting head with a nozzle surface, a first shaft portion, and a housing portion, featuring a first external thread and a first internal thread, allowing for secure fixation to either a first or second holding member, enabling screwing from both sides, and utilizing a cylindrical member with increased rigidity and ease of handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid ejecting heads are fixed using intermediate members with screwing processes from one side or the other side, then the fixation can be achieved, but the production and repair processes become complicated
Solution Approach 1:
The shaft portion is divided into two distinct functional segments: a first shaft portion with an external thread for securing to the holding member, and a second shaft portion with an internal thread for receiving the intermediate member. This segmentation allows each portion to be optimized for its specific function, simplifying the overall fixation process while reducing complexity.
Solution Approach 2:
The shaft portion is designed to serve multiple functions: it provides both the securing interface to the holding member (via external thread) and the connection interface to the intermediate member (via internal thread). This multi-functionality eliminates the need for separate components, simplifying both production and repair processes.
2Reliability
If liquid ejecting heads are fixed to holding members, then secure fixation is achieved, but positioning and alignment precision becomes difficult to maintain
Solution Approach 1:
The intermediate member acts as a mediator between the shaft portion and the holding member. It provides a precise positioning interface that ensures accurate nozzle alignment while maintaining secure fixation. The intermediate member translates the threaded connection into precise positional alignment, resolving the contradiction between security and precision.
3Adaptability or versatility
If multiple types of liquid ejecting heads are used to meet varied fixation requirements, then adaptability is improved, but inventory complexity increases
Solution Approach 1:
The shaft portion design with both external and internal threads provides universal compatibility with different holding members and intermediate members. This single design can accommodate various fixation requirements without needing multiple head types, reducing inventory complexity while maintaining adaptability.
Solution Approach 2:
The threaded connection system allows for adjustable and flexible fixation configurations. The same shaft portion can be adapted to different holding members by simply changing the intermediate member or thread configuration, providing dynamic adaptability without requiring multiple fixed designs.
Data Source
AI summary
Provided is a liquid ejecting head including a nozzle surface, a shaft portion, and a housing portion. The nozzle surface has nozzles configured to eject liquid in a first direction. The shaft portion includes a shaft main body extending in the first direction. The housing portion has a through-hole in which the shaft portion is inserted. The first shaft portion has a first external thread and a first internal thread on a first side to which the first direction leads.