Cartridge Coupling with Pivoting Engagement for Stable Drum Rotation
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in maintaining consistent torque requirements for detachable cartridges, affecting the stability and efficiency of photosensitive drum rotation.
Innovation Solution
The introduction of a cartridge structure with a coupling mechanism that includes a movable member and engaging portions to manage driving and braking forces, ensuring stable rotation of the photosensitive drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a coupling mechanism with movable member and engaging portions is introduced to manage driving and braking forces, then the stability of photosensitive drum rotation is improved, but the device complexity increases
Solution Approach 1:
The coupling mechanism is divided into distinct functional components: a movable member with engaging portions for driving force transmission, and a separate braking force application member. This segmentation allows each component to be optimized for its specific function while working together to achieve stable drum rotation.
Solution Approach 2:
The movable member is designed to move relative to the main body of the coupling, transitioning between different positions to engage or disengage the driving and braking forces. This dynamic capability allows the mechanism to adapt to varying operational requirements while maintaining stability.
2Productivity
If the coupling structure includes movable member and engaging portions for force management, then the operational efficiency is improved, but the ease of manufacture decreases
Solution Approach 1:
By dividing the coupling mechanism into separate manufacturable components (movable member, main body, engaging portions), each part can be manufactured using standard processes and then assembled, balancing operational efficiency with manufacturing ease.
3Manufacturing precision
If the movable member is provided with engaging portion to be entered between driving force application member and braking force application member, then the torque control precision is improved, but the device complexity increases
Solution Approach 1:
The engaging portion of the movable member acts as an intermediary element that precisely transmits and controls the interaction between the driving force application member and the braking force application member, enabling accurate torque control through a relatively simple mechanical interface.
Data Source
AI summary
A cartridge includes a photosensitive drum and a casing having a first end portion and a second end portion opposite to the first end portion in a direction of the rotational axis of the photosensitive drum. A coupling is positioned adjacent to the first end portion of the casing, with the coupling being operatively connected to the photosensitive drum so as to transmit a driving force toward the photosensitive drum. The coupling includes a main body configured to rotate about a rotational axis of the main body to thereby transmit the driving force and at least one engaging member, with the engaging member being pivotable relative to the main body between a first position and a second position about a pivot axis that is non parallel to the rotational axis of the main body, and with the engaging member being configured to transmit the driving force toward the photosensitive drum via the main body.