Liquid Ejecting Head Unit Height Adjustment Mechanism
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Solution Overview
Problem
Ink jet type recording head units with elongated shapes, configured by bonding multiple heads to a substrate with adhesive, face challenges in replacing individual heads due to adhesive-related issues, leading to increased costs and difficulties in precise height adjustment.
Innovation Solution
A liquid ejecting head unit with a detachable height changing-fixing section that allows for easy mounting and dismounting of heads and precise height adjustment, eliminating the need for adhesive protrusion control, and enabling selective replacement of faulty heads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ink jet type recording heads are bonded to a head fixing substrate using adhesive, then the yield is improved and cost is reduced, but replacement of individual heads becomes difficult and cost increases
Solution Approach 1:
The invention divides the head fixing substrate into multiple independent mounting regions, each capable of holding a single ink jet type recording head. This segmentation allows individual heads to be replaced without affecting others, resolving the contradiction between maintaining high yield through multi-head configuration and enabling easy replacement of faulty heads.
2Ease of manufacture
If adhesive is used to bond ink jet type recording heads to head fixing substrate, then heads can be mounted, but precise control of adhesive protrusion amount becomes difficult
Solution Approach 1:
The invention extracts the height adjustment function from the adhesive bonding process and implements it through a separate mechanical structure. The height changing-fixing section is detached from the head fixing substrate, allowing precise control of liquid ejecting head height without relying on adhesive protrusion control, thus resolving the contradiction between ease of mounting and manufacturing precision.
3Strength
If adhesive bonding is used for head mounting, then heads can be secured, but height adjustment precision is insufficient
Solution Approach 1:
The invention separates the bonding function from the height adjustment function. The head fixing substrate provides secure bonding through adhesive, while the detachable height changing-fixing section provides precise height adjustment. This segmentation allows each component to optimize its specific function without compromising the other, resolving the contradiction between bonding strength and height adjustment precision.
Data Source
AI summary
A liquid ejecting head unit includes: a liquid ejecting head having a liquid ejecting surface in which a nozzle opening for ejecting liquid is formed; a head fixing substrate which holds the surface sides opposite to the liquid ejecting surfaces of a plurality of liquid ejecting heads; and a height changing-fixing section which is provided between the head fixing substrate and the liquid ejecting head and can adjust a distance between the head fixing substrate and the liquid ejecting head, in which the height changing-fixing section is detachably fixed to the surface opposite to the liquid ejecting surface of the liquid ejecting head, and the height changing-fixing section and the head fixing substrate are detachably fixed to each other by screwing from the surface side opposite to a fixing surface of the head fixing substrate, to which the liquid ejecting head is fixed through the height changing-fixing section.