Rib-Shaped Protrusion Member for Inkjet Head Medium Raising Prevention
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Solution Overview
Problem
Inkjet recording apparatuses face challenges in effectively preventing the medium from raising up and contacting the head surface, leading to contamination, as existing configurations for curbing this issue are inadequate, particularly in the region of the head surface.
Innovation Solution
A recording apparatus with a liquid ejection head and a facing portion, where a rib-shaped protrusion member protrudes from the plate member to intersect the medium transport direction, effectively preventing medium raising and reducing head rubbing by covering a wide range with fewer protrusion members, and includes features like chamfered corners to guide the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressing members are provided upstream or downstream of the head surface, then the medium can be pressed against the support member, but the raising-up curbing effect is difficult to exhibit in the region of the head surface
Solution Approach 1:
The invention changes the spatial arrangement by providing multiple pressing members at the same position (upstream of the head surface) rather than distributing them upstream and downstream. This dimensional consolidation allows the pressing members to work together to curb medium raising-up directly in the head surface region, resolving the contradiction between reliability and operational effectiveness.
Solution Approach 2:
The pressing members are specifically positioned upstream of the head surface with their pressing surfaces facing the medium, creating a localized pressing zone directly where the head surface is located. This local concentration of pressing force ensures effective raising-up prevention in the critical head surface region while maintaining overall system reliability.
2Reliability
If multiple protrusion members are provided to cover the head surface region, then the medium raising can be effectively curbed, but the number of parts and apparatus cost increase
Solution Approach 1:
The invention merges multiple pressing functions into a single integrated pressing member structure. The pressing member includes a pressing surface that can press the medium over a wide range, combining what would otherwise require multiple separate protrusion members. This reduces part count and apparatus cost while maintaining effective medium raising prevention through the extended pressing surface.
Solution Approach 2:
The pressing member is designed with multi-functionality, serving both as a structural support element and as a medium pressing element. The pressing surface can cover a wide range of the head surface region, allowing a single component to perform the function that would otherwise require multiple specialized protrusion members, thereby reducing device complexity while maintaining reliability.
Data Source
AI summary
A recording apparatus includes a liquid ejection head including a plurality of nozzles configured to eject a liquid onto a medium; and a facing portion disposed to face the liquid ejection head, wherein the liquid ejection head includes, in a plate member facing the facing portion, a head chip including the nozzles; and a protrusion member protruding from the plate member to the facing portion, the protrusion member being a rib-shaped member disposed to avoid the nozzles provided in the head chip, and the protrusion member extends in a direction intersecting the medium transport direction.