Printhead Manifold with Internal Pump for Fluid Flow Control

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Solution Overview

Problem

Existing printheads rely on complex and expensive external delivery systems to supply and return print fluid, occupying valuable space and increasing costs.

Innovation Solution

Integration of internal pumps within the printhead to manage the flow of print fluid, eliminating the need for external pumps by providing self-sufficient pumping power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external pumps are used to supply and return print fluid, then the printhead can maintain proper fluid flow, but the system complexity and cost increase

Engineering Contradiction:

Improvefluid flow controlVSAvoidexternal delivery system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the pumping function with the printhead by integrating a pump into the fluid manifold structure. This merging of functions eliminates the need for separate external pumps while maintaining proper fluid flow control, directly resolving the contradiction between reliability and device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fluid manifold is designed to serve multiple functions: it acts as both a fluid distribution channel and houses an integrated pump mechanism. This multi-functionality allows the system to maintain reliable fluid flow control without requiring additional external pumping components, thereby reducing system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If external pumps are used to convey print fluid, then the printhead can regulate fluid flow, but the system occupies valuable space

Engineering Contradiction:

Improvefluid flow regulationVSAvoidsystem space

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The pump mechanism is nested within the fluid manifold structure of the printhead. By placing the pump inside the existing manifold volume, the system maintains fluid flow regulation capability without occupying additional external space, thus resolving the contradiction between reliability and volume

Inventive Principle:

Principle #7Nested doll (Nesting)

3Reliability

If external pumps are used to supply print fluid, then the printhead can maintain negative pressure, but the system cost increases

Engineering Contradiction:

Improvepressure controlVSAvoidsystem cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The integration of the pump into the fluid manifold combines multiple functions into a single component structure. This merging reduces the total number of parts required, simplifies assembly, and lowers manufacturing costs while maintaining the ability to regulate fluid flow and pressure

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The printhead becomes self-sufficient by incorporating its own pump mechanism within the manifold. This self-service capability eliminates the need for external pumping equipment, reducing system cost while maintaining reliable pressure control

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12472751B2Printhead with internal pump at fluid manifold

Publication Date: 2025.11.18 RICOH CO LTD

AI summary

Printheads and a method of operating a printhead. In one embodiment, a printhead comprises a plurality of jetting channels, a manifold internal to the printhead that is configured to convey a print fluid from an inlet of the printhead to the jetting channels, and an internal pump disposed at the manifold. The internal pump is configured to draw the print fluid into the manifold through the inlet, and to discharge the print fluid from the manifold to the jetting channels.