Printhead Storage Receptacle to Prevent Air Ingestion

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Solution Overview

Problem

Air ingestion into printhead fluid chambers during decoupling and recoupling from fluid supplies leads to reduced printing fluid volume, affecting printhead performance and lifespan.

Innovation Solution

The use of printhead storage devices and switching stations that maintain a fluid connection with a receptacle containing printing fluid, even when printheads are not in use, to prevent air ingestion by compensating for volume changes with printing fluid.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If printheads are decoupled from fluid lines for mode switching or replacement, then printhead flexibility and replaceability are improved, but air ingestion into printhead fluid chambers occurs leading to reduced printing fluid volume

Engineering Contradiction:

Improveprinthead flexibilityVSAvoidprinting fluid volume

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

A storage device with a receptacle acts as an intermediary between the fluid line and the printhead. The receptacle maintains a fluid connection to the printhead even when the printhead is decoupled from the fluid line, preventing air ingestion while allowing printhead replacement and mode switching.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The storage device is pre-filled with printing fluid before the printhead is decoupled. This preliminary preparation ensures that when the printhead is reconnected or replaced, the receptacle already contains sufficient printing fluid to prevent air ingestion, eliminating the need for post-decoupling fluid refilling.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If printheads remain connected to fluid supplies during non-operative conditions, then air ingestion is prevented, but device complexity and fluid management requirements increase

Engineering Contradiction:

Improveair ingestion preventionVSAvoidfluid connection system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The fluid connection system is segmented into three distinct components: the fluid line, the storage device with receptacle, and the printhead. This segmentation allows the printhead to be decoupled from the fluid line while maintaining connection to the storage device, simplifying the overall system architecture and enabling independent replacement of printheads without compromising fluid supply.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If printheads are frequently removed and reinstalled, then printhead replacement capability is improved, but air ingestion occurs reducing printhead lifespan

Engineering Contradiction:

Improveprinthead replaceabilityVSAvoidprinthead lifespan

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

The storage device maintains a ready supply of printing fluid in the receptacle before printhead removal. This preliminary preparation ensures that when printheads are frequently removed and reinstalled, the receptacle already contains sufficient printing fluid to prevent air ingestion, thereby protecting printhead lifespan while enabling frequent replacements.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260001345A1Air ingestion prevention

Publication Date: 2026.01.01 HEWLETT PACKARD DEVELOPMENT COMPANY LP

AI summary

According to an example, a printhead storage device comprises a printhead pocket to receive a printhead, a receptacle with an interior chamber wherein printing fluid is provided, and a fluid interconnect device comprising a fluid path with the interior chamber. Upon insertion of a printhead to the pocket, the fluid interconnect device is connected to the printhead, thereby providing a fluid connection between the printhead and the interior chamber and wherein the printhead is not operable when inserted in the printhead pocket.