Stop Pins for Electrode Gap Control in Liquid Electrophotography
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Solution Overview
Problem
In liquid electro-photographic (LEP) printing, maintaining a consistent gap between developer roller surfaces and electrodes is challenging due to manufacturing and assembly tolerances, leading to non-uniform print agent application and print defects on the substrate.
Innovation Solution
A developer system with a housing, rotatably connected developer roller, and stop pins to establish precise target distances between the developer roller surface and electrodes, using either fixed or eccentric stop pins, and a gap measurement component to determine attributes for the stop pins based on predicted distance data for accurate gap setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manufacturing and assembly tolerances are relaxed to reduce production complexity, then device complexity and manufacturing cost decrease, but gap consistency between developer roller surfaces and electrodes deteriorates, causing non-uniform print agent application
Solution Approach 1:
The patent introduces stop pins as intermediary elements between the developer roller and electrodes. These stop pins serve as mechanical mediators that physically define and maintain the precise gap distance, allowing the system to achieve consistent gaps without requiring tight manufacturing tolerances on the roller and electrode components themselves.
Solution Approach 2:
The patent changes the approach from controlling gap through component dimensions to controlling gap through adjustable stop pin positions. By making the stop pins adjustable or selectable in different positions, the system can compensate for manufacturing variations and achieve precise gap control independent of component manufacturing precision.
2Manufacturing precision
If tight manufacturing and assembly tolerances are enforced to maintain consistent gaps, then print quality improves, but production complexity and manufacturing cost increase
Solution Approach 1:
The stop pins act as intermediary reference elements that simplify the assembly process. Instead of requiring precise alignment and gap control between multiple components, the stop pins provide a simple mechanical reference that guides the positioning, reducing assembly complexity while maintaining gap consistency.
Solution Approach 2:
The stop pins are designed to self-align or self-position during assembly, providing automatic gap establishment without requiring complex adjustment procedures. This self-service characteristic reduces the skill level and time required for assembly while maintaining precise gap control.
3Manufacturing precision
If stop pins are made adjustable to compensate for tolerance variations, then gap precision improves, but device complexity and number of parts increase
Solution Approach 1:
The stop pins are designed to serve multiple functions: they define the gap distance, provide mechanical support, and enable adjustment for tolerance compensation. By consolidating these functions into a single component, the patent avoids increasing overall device complexity despite adding adjustability.
Solution Approach 2:
The patent changes the stop pin from a fixed component to an adjustable or selectable component with varying positions or lengths. This parameter change allows the same basic component design to accommodate tolerance variations without requiring multiple different types of parts or complex adjustment mechanisms.
Data Source
AI summary
In one example of the disclosure, a developer system includes a housing and a developer roller. A first electrode and a second electrode are disposed in the housing, the first and second electrodes to create an electrical charge to cause transfer of printing fluid to a developer roller surface. The developer roller is rotatably connected to the housing. The developer includes a surface, a bearing to support and enable rotation of an axle attached to the developer roller, and a plurality of stop pins. The plurality of stop pins are connected to the housing. The stop pins are to support the bearings and to establish target distances between the developer roller surface and the first electrode and second electrodes.