Roller Separator Device with Arced Aperture for Friction Reduction
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Solution Overview
Problem
Existing separator devices for electrophotographic printers, such as separator sheets and cam devices, can cause frictional drag and noise during printing, leading to print defects and reliability issues, and do not effectively address the chemical degradation of rollers when in stationary contact for extended periods.
Innovation Solution
A roll assembly with translatable components and separator devices featuring circular arcs of differing radii, which initially separate the developer roll and PC drum and automatically disengage to allow contact upon rotation, reducing frictional forces and preventing chemical degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separator sheets or wedges are used to separate rollers during shipping and storage, then chemical degradation and flat spot formation are prevented, but the devices require user removal and disposal during setup
Solution Approach 1:
The separator device automatically disengages itself from the roller assembly through a spring-loaded mechanism that responds to operational forces, eliminating the need for user removal. The device separates rollers during shipping/storage and self-activates during operation.
Solution Approach 2:
The separator device transitions from a static separated state during shipping to a dynamic engaged state during operation. A spring mechanism allows the separator to automatically move between positions based on operational forces applied to the roller assembly.
2Reliability
If cam devices are used to provide interference fit for separator engagement, then reliable separation is achieved, but frictional drag and noise increase during printing operations
Solution Approach 1:
The harmful interference fit function is extracted from the separator device and transferred to the roller components themselves. The separator provides only the necessary separation function without imposing radial interference forces, eliminating frictional drag and noise.
Solution Approach 2:
The separator device changes the engagement parameter from radial interference fit to axial positioning only. This parameter change eliminates the frictional contact that causes drag and noise while maintaining reliable separation functionality.
3Device complexity
If rollers remain in stationary contact during shipping and storage, then device complexity is reduced, but chemical degradation and flat spot formation occur over time
Solution Approach 1:
The separator device is divided into distinct functional segments: a positioning component that maintains axial separation, a spring mechanism that provides the separating force, and engagement features that attach to the roller shaft. This segmentation allows reliable separation with minimal complexity.
Solution Approach 2:
A spring-loaded intermediary mechanism is introduced between the separator and the roller assembly. This intermediary automatically responds to operational forces, providing reliable separation during shipping while requiring minimal structural complexity.
Data Source
AI summary
A roll assembly, including a frame; a first component mounted to the frame and having a shaft, the shaft; a second component rotatably mounted to the frame and disposed in proximity with the first component, wherein at least one of the first component and the second component is translatable relative to the other; and a plurality of separator devices mounted on ends of the shaft of one of the first and second component. Each separator device includes an aperture for mounting on the shaft on one of the first and second components, the aperture defining an inner bearing surface defined by a plurality of circular arcs of differing radii; and an outer contact surface for contacting the other of the first and second components and spacing the first and components apart when each of the separator devices is in a first rotational position about the shaft and being disengaged from the other of the first and second component when each of the separator devices is in a second rotational position about the shaft so as to allow outer surfaces of the first and second components to contact each other.