Separate Photoreceptor and Development Cartridge Coupling Mechanism
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Solution Overview
Problem
The existing electrophotographic image forming apparatuses require replacing integrated process cartridges, which includes both photoreceptor and development cartridges, even when the photoreceptor is still functional, leading to increased consumable costs due to the shorter toner life within these cartridges.
Innovation Solution
An electrophotographic image forming apparatus that allows for the individual attachment and detachment of photoreceptor and development cartridges, with a power connecting unit using gears and couplers to ensure stable power transmission and improved location stability, enabling separate replacement and handling of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an integrated process cartridge containing both photoreceptor and development components is used, then the structure is simplified and easier to handle, but the consumable cost increases because the entire cartridge must be replaced when toner is depleted even if the photoreceptor is still functional
Solution Approach 1:
The process cartridge is divided into separate photoreceptor cartridge and development cartridge that can be individually replaced. The photoreceptor cartridge includes a photoreceptor drum and mounting portion, while the development cartridge contains toner and a development roller. This segmentation allows users to replace only the development cartridge when toner is depleted, avoiding replacement of the still-functional photoreceptor and thereby reducing consumable costs.
2Loss of substance
If the photoreceptor cartridge and development cartridge are individually attachable and detachable, then consumable costs are reduced through selective replacement, but the device complexity increases due to additional coupling mechanisms and mounting structures
Solution Approach 1:
The system is segmented into modular cartridges with standardized interfaces. The photoreceptor cartridge has a mounting portion with guide protrusions that fit into corresponding guide grooves in the body, while the development cartridge has similar guiding features. This modular segmentation enables individual replacement without requiring complex integrated replacement mechanisms.
Solution Approach 2:
Coupling mechanisms serve as intermediaries between the cartridges and the body. The first coupler connects the photoreceptor cartridge to the body, while the second coupler connects the development cartridge to the photoreceptor cartridge. These intermediary coupling elements simplify the overall connection system by providing standardized, reusable interfaces rather than requiring direct complex integrations.
3Ease of operation
If the development cartridge is attached to the photoreceptor cartridge through a coupling mechanism, then individual replacement is enabled, but location stability may be compromised during mounting and removal operations
Solution Approach 1:
The coupling mechanisms feature asymmetric guide protrusions and guide grooves with specific geometric relationships. The guide protrusions have angled surfaces that mate with corresponding angled surfaces in the guide grooves, creating a stable locked position when engaged. The asymmetric design prevents accidental disengagement while maintaining easy intentional removal through designated release mechanisms.
Solution Approach 2:
The coupling mechanisms are designed to absorb and distribute mechanical stresses during mounting and removal operations. The guide protrusions and grooves are shaped to gradually guide the cartridges into their final positions, preventing sudden impacts or misalignments that could compromise location stability. The retreat preventing portions provide mechanical stops that cushion against over-insertion forces.
4Reliability
If gear mechanisms are used to transmit driving power from the photoreceptor cartridge to the development cartridge, then stable power transmission is achieved, but the device complexity increases due to additional mechanical components
Solution Approach 1:
The gear mechanisms are integrated into the existing coupling structures between cartridges. The first gear is mounted on the photoreceptor cartridge and meshes with the second gear on the development cartridge, combining the power transmission function with the mechanical coupling already required for individual replacement. This merging approach avoids adding separate power transmission systems and reduces overall complexity.
Data Source
AI summary
An electrophotographic image forming apparatus is provided including a body including an opening and a first coupler, a photoreceptor cartridge including a second coupler connected to the first coupler, a first gear connected to the second coupler, and a mounting portion, and attached to or detached from the body through the opening; and a development cartridge including a second gear connected to the first gear and attached or detached from the mounting portion through the opening while the photoreceptor cartridge is mounted in the body.