Pivotable Light-Blocking Lever for Ink Cartridge Durability
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Solution Overview
Problem
Conventional ink cartridges have light-blocking portions that protrude outward and are susceptible to damage from external impacts when not mounted, as they are always detected and thus exposed.
Innovation Solution
A liquid cartridge design where the light-blocking portion is pivotable and positioned lower when not in use, reducing exposure to external impacts, and is moved to a blocking position only when the cartridge is attached, ensuring it is protected until needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-blocking portion constantly protrudes outward to ensure detection, then the detection reliability is improved, but the light-blocking portion becomes susceptible to external impacts and may break
Solution Approach 1:
The light-blocking portion is designed to be movable rather than fixed, capable of pivoting between a protruding position (when cartridge is attached) and a retracted position (when cartridge is detached). This dynamic configuration allows the light-blocking portion to adapt its exposure based on operational needs, reducing vulnerability to external impacts while maintaining detection functionality.
Solution Approach 2:
The light-blocking portion is automatically positioned in the protruding state before the cartridge is attached to the recording apparatus, ensuring it is ready for detection. When the cartridge is detached, it automatically returns to the retracted position, preventing exposure to external impacts. This preliminary positioning resolves the contradiction by ensuring detection readiness only when needed.
2Duration of action of stationary object
If the light-blocking portion is made movable to reduce exposure, then the durability is improved, but the mechanism becomes more complex
Solution Approach 1:
The light-blocking portion utilizes the insertion and removal actions of the cartridge itself to trigger its position changes. When the cartridge is inserted, it automatically pushes the light-blocking portion into the protruding position; when removed, the light-blocking portion returns to the retracted position. This self-service mechanism eliminates the need for additional motors or actuators, maintaining simplicity while achieving durability.
Solution Approach 2:
The function of positioning the light-blocking portion is merged with the cartridge insertion/removal action. The physical act of attaching or detaching the cartridge simultaneously performs both the connection function and the light-blocking portion positioning function, reducing overall system complexity while improving durability through reduced exposure.
3Object-affected harmful factors
If the light-blocking portion is positioned lower when not in use, then the protection from external impacts is improved, but the detection function may be affected when attached
Solution Approach 1:
The light-blocking portion dynamically adjusts its vertical position based on whether the cartridge is attached or detached. In the detached state, it remains in a lower, protected position. Upon cartridge attachment, it pivots to a higher position that aligns with the optical sensor's detection path, ensuring accurate detection without compromising protection during storage.
Solution Approach 2:
The light-blocking portion has different positional states for different operational conditions: a protected lower position for storage/detached state and an active higher position for detection during attached state. This local quality differentiation ensures that protection and detection functions are optimized for their respective operational contexts without interfering with each other.
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 design minimizes the risk of damage to the light-blocking portion by keeping it lower when not in use and ensuring it is in the correct position for detection when the cartridge is attached, enhancing durability and detection reliability.
Implementation Method 1
The lever includes a light-blocking portion and a force-receiving portion. The light-blocking portion is configured to block or attenuate light traveling in a widthwise direction crossing the insertion direction and the gravitational direction.
Data Source
AI summary
A liquid cartridge configured to be inserted into a cartridge-attachment section in an insertion direction includes a casing, and a lever supported by the casing. The lever is pivotable about a pivot axis between a first position and a second position. The lever includes a light-blocking portion configured to block or attenuate light traveling in a widthwise direction crossing the insertion direction and a gravitational direction, and a force-receiving portion positioned closer to a front wall of the casing than the light-blocking portion is to the front wall in the insertion direction. The light-blocking portion is positioned lower at the second position than at the first position. The pivot axis is positioned frontward of the light-blocking portion and rearward of the force-receiving portion in the insertion direction. The lever pivots from the second position to the first position upon application of an external force to the force-receiving portion.