Snap-fit Cap Mechanism Preventing Ink Cartridge Detachment
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Solution Overview
Problem
The existing snap-fitting mechanism for attaching caps to ink cartridges can lead to accidental detachment due to resilient deformation over time, causing leakage and operational issues.
Innovation Solution
A liquid cartridge design featuring a snap-fit mechanism with engagement surfaces and projections, including engagement pawls, that securely attach the cap to the cartridge body or liquid supply sleeve, preventing accidental detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple snap-fitting mechanism is used to attach the cap, then the device complexity is reduced and ease of manufacture is improved, but the reliability of attachment deteriorates due to resilient deformation over time
Solution Approach 1:
The snap-fitting mechanism is segmented into multiple independent engagement elements: a first engagement pawl and a second engagement pawl, each capable of engaging with corresponding engagement surfaces. This segmentation allows the attachment function to be distributed across multiple points, reducing the impact of resilient deformation on overall attachment reliability while maintaining relatively simple device complexity.
2Device complexity
If a single engagement pawl is used in the snap-fitting mechanism, then the device complexity is minimized, but the attachment reliability is insufficient to prevent accidental detachment due to aging
Solution Approach 1:
The engagement mechanism employs local quality by creating distinct engagement zones with different functional characteristics. The first engagement pawl and second engagement pawl are positioned at different locations on the cap, each engaging with separate engagement surfaces on the cartridge body. This local distribution of engagement functions ensures that deformation in one area does not compromise the overall attachment, thereby improving reliability without significantly increasing complexity.
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 enhanced snap-fit mechanism ensures a secure attachment of the cap, reducing the likelihood of accidental detachment and maintaining the integrity of the ink supply, thereby preventing leakage and ensuring reliable operation.
Implementation Method 1
The snap-fit mechanism includes: a plurality of engagement surfaces, and a pair of projections. The pair of projections protrudes in a direction parallel to the first direction. The pair of projections is arranged to oppose each other in a direction crossing the first direction. Each of the pair of projections is provided with a pair of engagement pawls at a tip end portion. The pair of engagement pawls of each of the pair of projections is configured to be engaged with the corresponding one of the plurality of engagement surfaces.
Data Source
AI summary
A liquid cartridge includes: a cartridge body having a liquid storage chamber, a liquid supply sleeve having a distal end portion, a seal portion disposed at the distal end portion of the liquid supply sleeve, a cap fixing the seal portion, and a snap-fit mechanism configured to engage the cap with one of the cartridge body and the liquid supply sleeve. The snap-fit mechanism includes engagement surfaces and a pair of projections. Each projection includes a pair of engagement pawls configured to be engaged with the corresponding engagement surfaces at a tip end portion of each projection. The pair of engagement pawls of each projection includes a first engagement pawl protruding in a crossing direction, and a second engagement pawl protruding in a direction opposite to a direction in which the first engagement pawl protrudes in the crossing direction.