Liquid Ejection Head Groove Structure to Prevent Face Cover Peeling
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Solution Overview
Problem
Existing liquid ejection heads face issues with paper jams and nozzle protection member peeling due to the weakness of resin members against forces from the side surface when recording media with curved ends contact the liquid ejection head.
Innovation Solution
A liquid ejection head design featuring a support member with a groove on its surface, where a face cover is bonded, and resin is applied in the space surrounded by the support member and groove, forming an inclined surface towards the orifice face to enhance adhesion and prevent paper jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin member is provided between the side surface of the nozzle protection member and the recording medium conveyance surface to prevent paper jams, then paper jam prevention is improved, but the resin member is weak against side surface forces and may come off due to contact with the recording medium
Solution Approach 1:
The invention transitions from a flat resin member configuration to a three-dimensional structure with grooves and inclined surfaces. The grooves extend in the liquid ejection direction, creating multiple anchoring points, while the inclined surfaces provide mechanical interlocking with the recording medium, significantly enhancing the resin member's resistance to side surface forces without compromising paper jam prevention
Solution Approach 2:
The invention creates a composite structure combining the resin member with the support member through grooves and inclined surfaces. This composite design integrates the resin material with the structural support elements, forming a unified component that leverages both materials' properties to achieve superior adhesion strength and durability while maintaining the paper path guidance function
2Object-affected harmful factors
If the end portion of the recording medium is curved, then the recording medium may come into contact with the side surface of the liquid ejection head, but providing a resin member to prevent contact reduces adhesion strength
Solution Approach 1:
The invention uses three-dimensional grooves and inclined surfaces to create mechanical interlocking structures. The grooves extend along the liquid ejection direction, providing multiple anchoring points that distribute stress, while the inclined surfaces create friction and mechanical resistance, enhancing adhesion strength without requiring the resin member to simply block the recording medium path
Solution Approach 2:
The inclined surfaces created by the grooves provide curved, sloped interfaces that guide the recording medium smoothly while maintaining strong adhesion. The curved geometry of the inclined surfaces allows the recording medium to follow the contour without abrupt contact, preventing paper jams while the gradual slope maintains continuous adhesion strength along the contact area
Data Source
AI summary
A liquid ejection head includes a liquid ejection substrate configured to have an orifice face provided with an ejection orifice that ejects liquid, a face cover configured to be bonded to the liquid ejection substrate and protect the orifice face, and a support member configured to support the face cover, wherein the support member is provided with a groove in a surface to which the face cover is bonded, the groove partially overlapping the face cover when seen from a direction perpendicular to the orifice face, and wherein the liquid ejection head includes resin provided over a space surrounded by the support member and the face cover, and the groove, the resin forming an inclined surface toward the orifice face.