Rotating Printer Maintenance Carousel to Prevent Vertical Waste Ink Buildup
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Solution Overview
Problem
Inkjet printers face issues with waste ink accumulation leading to vertical formations (stalagmites) that interfere with printhead operation, and ineffective collection of aerosolized particles, causing print quality failures and potential damage.
Innovation Solution
A maintenance carousel with a shroud, tray, and actuator assembly that rotates to distribute waste ink evenly, utilizing absorbent pads, electrostatic plates, or a fan assembly to collect and manage ink droplets and particles effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stationary absorbent pads are used to collect waste ink, then waste ink collection is provided, but waste ink accumulates into vertical structures (stalagmites) that interfere with printhead operation
Solution Approach 1:
The patent applies the dynamics principle by making the waste ink collection pad rotatable rather than stationary. The rotation mechanism allows the pad to change its position and orientation periodically, preventing waste ink from accumulating in the same location and forming vertical stalagmite structures. This dynamic movement distributes ink deposition across different areas of the pad over time, eliminating the harmful concentration effect that occurs with stationary pads.
Solution Approach 2:
The patent implements periodic action through the rotational movement of the waste ink collection pad. The pad rotates at regular intervals to redistribute waste ink deposition areas, preventing continuous accumulation in one spot. This periodic repositioning ensures that no single location receives excessive ink buildup, thereby preventing the formation of vertical structures that would interfere with printhead operation.
2Reliability
If more waste ink is ejected to keep nozzles fresh, then print quality is maintained, but waste ink accumulation increases and may contact printheads
Solution Approach 1:
The rotatable pad design dynamically redistributes the increasing volume of waste ink across a larger surface area over time. As the pad rotates, different sections are exposed to ink deposition, preventing concentration in any single area. This allows the system to handle higher waste ink volumes without creating the dangerous vertical accumulation that would occur with a stationary pad.
Solution Approach 2:
The rotation mechanism introduces a temporal dimension to waste ink collection. Instead of waste ink accumulating in a fixed two-dimensional spot, the rotating pad distributes deposition across multiple areas sequentially, effectively utilizing the time dimension to manage ink volume. This dimensional approach prevents vertical buildup by spreading ink distribution across both space and time.
3Reliability
If replaceable felt pads are used, then waste ink can be collected, but users must periodically replace saturated pads which increases cost and inconvenience
Solution Approach 1:
The system implements self-service through the rotatable pad mechanism that automatically redistributes waste ink without user intervention. The continuous rotation prevents saturation in any single area, extending the operational life of the pad and eliminating the need for frequent manual replacement. This automated self-maintaining feature reduces both user inconvenience and operational costs.
Solution Approach 2:
The rotation mechanism ensures continuous useful action by constantly refreshing the active collection surface of the pad. As the pad rotates, fresh surfaces are continuously presented to receive waste ink, preventing premature saturation and extending the pad's service life. This continuous renewal of collection capacity eliminates the periodic interruption required for pad replacement.
4Device complexity
If aerosolized waste ink particles are not effectively collected, then collection mechanism is simple, but particles accumulate on critical components causing damage or malfunction
Solution Approach 1:
The rotation of the waste ink collection pad creates dynamic air flow patterns that enhance the capture of aerosolized particles. The moving surface generates subtle air currents that help draw floating particles toward the collection area, improving capture efficiency without requiring complex active suction systems. This dynamic approach increases reliability while maintaining relative simplicity.
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
Prevents ink build-up into vertical formations, enhances ink collection efficiency, reducing maintenance costs and printer damage, and extending printer lifespan.
Implementation Method 1
The actuator assembly includes a one way clutch configured to permit rotation only in a first direction
Implementation Method 2
The maintenance carousel includes a spring extending between an anchor positioned on the shroud cover and a hooked portion of the actuator. The spring applies a return force to the actuator in response to the printer engaging the actuator.
Implementation Method 3
The actuator assembly includes a gear unit configured to rotate in unison with the one way clutch. The gear unit is designed to engage the tray.
Implementation Method 4
The shroud includes one or more friction tabs arranged to apply friction to the tray when the actuator assembly drives rotation of the tray
Implementation Method 5
an absorbent pad is positioned within the tray and configured to absorb the waste ink dispensed from the printer
Implementation Method 6
One or more electrostatic plates are disposed at least partially within the one or more electrostatic plate housings and are configured to generate an electromagnetic field
Data Source
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AI summary
A maintenance carousel for collecting waste ink ejected by one or more printheads of an inkjet printer is provided. In some instances, the maintenance carousel may include a tray and an actuator assembly retained within an enclosure. The actuator assembly may be configured to drive rotation (e.g., indexing) of the tray each time the printheads eject waste ink into the maintenance carousel. This rotation may cause ink to accumulate within a tray of the maintenance carousel in a circular pattern. In some instances, the maintenance carousel may include electrostatic plates configured to generate an electromagnetic field which may improve collection of small droplets or aerosolized particles of waste ink. In further instances, the maintenance carousel may include a fan assembly configured to generate an airflow through the maintenance carousel such that small droplets or aerosolized particles of waste ink may be collected by one or more filters.