Liquid Ejecting Head Reference Projection for Precise Inclination Alignment
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Solution Overview
Problem
Existing recording apparatuses face issues with deviations in the position of the center of rotation during the adjustment of the inclination of the recording head, leading to difficulties in precise positioning.
Innovation Solution
The liquid ejecting head incorporates a reference projection or recessed part that passes through three equidistant points in the circumferential direction, allowing for precise rotation and alignment using a fitting part and moving mechanism, thereby controlling deviations in the center of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a member is brought into contact with the side surface of the head to move the head, then the head can be moved and inclined, but the position of the center of rotation deviates from the reference nozzle
Solution Approach 1:
A reference projection is introduced as an intermediary element between the head and the supporting member. The reference projection has a specific geometric shape (cylinder, prism, or cone) that enables precise rotational movement while maintaining the center of rotation at the reference nozzle position. This intermediary structure mediates between the need for easy head adjustment and the requirement for precise center of rotation positioning.
Solution Approach 2:
The invention moves from contacting the side surface of the head (one-dimensional contact) to using a reference projection that extends in multiple dimensions. The reference projection provides a three-dimensional interface for the supporting member, enabling precise control of the center of rotation through geometric constraints in multiple spatial dimensions.
2Ease of operation
If the first supporting part and second supporting part are not in contact with appropriate locations on the head holder, then the head can be adjusted, but the center of rotation position deviates
Solution Approach 1:
The reference projection is pre-formed on the head with a specific geometric configuration before the adjustment operation. This preliminary structuring of the reference projection ensures that when the supporting parts contact it, the center of rotation is automatically positioned at the reference nozzle, eliminating the need for precise manual positioning of supporting parts.
Solution Approach 2:
The invention changes the geometric parameters of the interface between the head and supporting member. By defining specific geometric shapes for the reference projection (cylinder, prism, cone) with predetermined dimensions and orientations, the system transforms the adjustment process from one requiring precise positional control to one where the geometry itself determines the center of rotation position.
Data Source
AI summary
A liquid ejecting head includes a channel member which has: a plurality of nozzles configured to eject a liquid, and a channel configured to supply the liquid to the plurality of nozzles, a reference projection which is a projection projected in a direction opposite to an ejecting direction of the liquid from the plurality of nozzles being formed in a surface of the channel member. An outer surface of the reference projection passes through at least three points equidistant from an axis passing through a reference nozzle, which is any one of the plurality of nozzles, along the ejecting direction, the at least three points being located, respectively, at mutually different positions in a circumferential direction of which center is the axis.