Liquid Ejection Head Face Cover Structure Against Paper Jams
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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 lateral forces when recording media with curled ends contact the side surfaces.
Innovation Solution
A liquid ejection head design featuring a support member with grooves and resin application to form an inclined surface, enhancing adhesion and guiding the recording medium away from potential jamming areas.
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 the recording medium can pass without jamming, but the resin member is weak against lateral forces and could come off due to contact with the recording medium
Solution Approach 1:
The invention uses a composite structure combining a rigid support member with a resin member. The support member provides structural strength to resist lateral forces from curled recording media, while the resin member maintains its function of preventing paper jams. This composite approach allows both functions to coexist without compromising either paper jam prevention or lateral force resistance.
Solution Approach 2:
The invention extends the support member in the lateral direction to form a side surface that protrudes toward the recording medium. This dimensional extension creates a physical barrier that guides the recording medium and prevents it from contacting the resin member directly, thereby protecting the resin member from lateral forces while maintaining its paper jam prevention function.
2Device complexity
If the nozzle protection member is bonded directly to the liquid ejection substrate without additional support, then the structure is simpler, but the nozzle protection member may peel due to forces from curled recording medium ends
Solution Approach 1:
The invention introduces a support member as a separate component between the liquid ejection substrate and the nozzle protection member. This segmentation allows the support member to specifically承担 the mechanical loads from curled recording media, while the nozzle protection member focuses on its primary function of protecting the nozzles. The separated structure improves bonding stability without significantly increasing overall complexity.
Solution Approach 2:
The support member acts as an intermediary element between the liquid ejection substrate and the nozzle protection member. It provides additional bonding surfaces and structural support, distributing the forces from curled recording media away from the nozzle protection member bonds. This intermediary structure enhances bonding stability while maintaining reasonable structural simplicity.
Data Source
Figure 1
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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.