Ink Cartridge Vent Plug Asymmetry for Ink Type Identification
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Solution Overview
Problem
Existing ink cartridges lack a reliable method to determine the type of ink inside the ink bag, especially when the bag is not transparent, as the color indicator is typically located on the case and not on the ink bag itself.
Innovation Solution
A liquid-holding container with a vent plug featuring first and second projecting portions of different lengths, which can be oriented in two positions relative to the vent plug, allowing easy identification of the ink type by checking the positional relationship, and a separate attaching portion that can be switched between orientations to accommodate various vent plugs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ink bag is made non-transparent to protect the ink or simplify manufacturing, then the manufacturing cost is reduced and durability is improved, but the ability to determine the ink type is lost
Solution Approach 1:
The patent introduces an intermediary indicator mechanism (projecting portions on the vent plug) that mediates between the non-transparent ink bag and the user's need to identify ink type. The indicator externally represents the internal ink type without requiring transparency of the bag itself.
Solution Approach 2:
The patent replaces the visual/optical method of ink type identification (requiring transparent bag and direct visual inspection) with a mechanical indicator system (projecting portions of different lengths) that provides tactile and visual cues about ink type.
2Device complexity
If the color indicator is placed on the case instead of the ink bag, then the ink bag structure is simplified, but the indicator cannot be directly associated with the specific ink bag contents
Solution Approach 1:
The patent merges the indicator function with the vent plug, which is directly connected to the ink bag. This integration ensures that the indicator on the vent plug reliably reflects the specific ink bag contents, combining the advantages of both direct association and structural simplicity.
3Loss of information
If multiple types of vent plugs are created to indicate different ink types, then the ink type can be clearly identified, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses asymmetric design by providing projecting portions of different lengths (first length and second length) on the vent plug. This asymmetric configuration allows a single vent plug design to indicate multiple ink types through the relative positions and lengths of the projecting portions, avoiding the need for multiple completely different vent plug types.
4Loss of information
If the ink bag is made transparent to allow visual determination of ink type, then the ink type can be directly seen, but the manufacturing cost increases and the ink may be more susceptible to degradation
Solution Approach 1:
The patent introduces an intermediary indicator mechanism (projecting portions on the vent plug) that mediates between the non-transparent ink bag and the user's need to identify ink type. The indicator externally represents the internal ink type without requiring transparency of the bag itself.
Data Source
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AI summary
A liquid-holding container (31) is provided with a liquid-holding bag (13), a vent plug (70), a first projecting portion (83), and a second projecting portion (85). The liquid-holding bag (13) is flexible and is able to contain a liquid. The vent plug (70) is connected to the liquid-holding bag (13). The first projecting portion (83) is connected to the vent plug (70) and extends in a direction that intersects a face of the liquid-holding bag (13). The second projecting portion (85) is connected to the vent plug (70) on the opposite side of the vent plug (70) from the first projecting portion (83). The second projecting portion (85) extends in a direction that intersects the face of the liquid-holding bag (13), such that the second projecting portion is opposite the first projecting portion (83). The length of the second projecting portion (85) from the face that includes the axis of the vent plug (70) is shorter than the length of the first projecting portion (83).