Fluid Cartridge Guide Track and Latch Mechanism
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Solution Overview
Problem
Existing fluid cartridge locking mechanisms in printers consume significant space and require substantial force for engagement, leading to potential improper connections, leakage, and material wear due to the need for rotational alignment and deflection of engaging elements.
Innovation Solution
A fluid ejection system with a receiving structure that uses a guide track and latch track mechanism to confine cartridge insertion and ejection to a single dimension, employing a latch arrangement with a pivot arm and spring-loaded ejector to ensure secure, space-efficient, and low-force connections, while preventing rotational movement and allowing for proper alignment of fluidic and electrical interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lock mechanisms (bail or deforming snap finger) are used to maintain air and liquid tight connections, then secure connection is achieved, but the space consumed within the printer increases and significant force is required for engagement
Solution Approach 1:
The locking mechanism is segmented into a latch arm with a latch finger and a separate latch trigger mechanism. The latch arm is hinged to the receiving structure while the latch trigger is movable between engaged and disengaged positions. This segmentation allows the locking function to be distributed across multiple simple components rather than requiring a single complex mechanism, reducing overall space consumption while maintaining connection security.
Solution Approach 2:
Instead of using a deforming snap finger that requires significant force to engage, the invention uses a latch trigger that moves between positions to engage or disengage the latch finger. The latch finger is biased by a spring to automatically engage with the cartridge, inverting the traditional approach where force is applied during engagement. This inversion reduces the force required by the user while maintaining secure connection.
2Reliability
If cartridge insertion involves rotational movement to align interfaces, then proper connection can be achieved, but material wear or damage and leakage are likely to occur
Solution Approach 1:
The invention transitions from rotational alignment to linear dimensional alignment. The guide track provides a predetermined path that constrains the cartridge to move along a straight line into the receiving structure. The alignment features (guide ribs, alignment pockets) work in one dimension (linear insertion) rather than requiring rotational movement. This dimensional change eliminates the harmful effects of rotation while achieving proper interface connection through guided linear motion.
Solution Approach 2:
The guide track acts as an intermediary between the cartridge and the receiving structure. It provides a predetermined path that mediates the insertion process, ensuring proper alignment through its geometric constraints (guide ribs, alignment pockets) before the cartridge reaches the final connected position. This intermediary structure prevents direct rotational contact between interfaces, eliminating wear and leakage risks associated with rotational alignment.
3Reliability
If deforming snap finger is used to engage notch for locking, then cartridge can be secured, but the mechanism consumes significant space and requires substantial force
Solution Approach 1:
The latch finger is equipped with a spring bias that enables it to automatically engage with the cartridge without requiring significant user force. When the cartridge is inserted along the guide track, the latch finger self-actuates through spring force to secure the cartridge in place. The latch trigger simply needs to move between positions to enable or disable this self-service locking action, dramatically reducing the force required compared to deforming snap finger mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables secure, space-efficient, and low-force connections of fluid cartridges, reducing the risk of leakage and material damage, while ensuring proper alignment and easy manual handling, with automatic ejection if connections are not made correctly.
Implementation Method 1
a spring-loaded ejector to ensure secure, space-efficient, and low-force connections
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Fluid cartridge (3), including interfaces, arranged to be guided along a straight line for connecting the interfaces.