Developing Cartridge Pivot Contact Without Spring Electrodes
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Solution Overview
Problem
Conventional image forming apparatuses require a spring to ensure contact between the electrode of a developing cartridge and the electrode of a drum unit, which can lead to mechanical wear and complexity.
Innovation Solution
A developing cartridge design that utilizes pivotal movement of the cartridge about a boss to establish electrical contact between the cartridge's electrode and the drum unit's electrode without the need for a spring, using a conductive resin electrode to support the developing roller shaft and supply roller shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is provided between the casing and the electrode to ensure contact, then the electrical connection reliability is improved, but the device complexity and mechanical wear increase
Solution Approach 1:
The spring component is completely removed from the system. Instead of using a spring to maintain contact pressure, the patent uses a boss structure that guides the cartridge into pivotal movement, allowing the electrode to contact the drum unit electrode through the natural motion of cartridge installation without requiring elastic elements.
Solution Approach 2:
The mechanical spring-based contact maintenance system is replaced with a geometric guidance system using the boss structure. The boss directs the cartridge's movement path, converting the installation motion into pivotal movement that automatically establishes electrical contact without needing elastic forces.
2Reliability
If a spring is provided between the casing and the electrode, then contact pressure is maintained, but mechanical wear increases
Solution Approach 1:
The spring component is completely removed from the system. Instead of using a spring to maintain contact pressure, the patent uses a boss structure that guides the cartridge into pivotal movement, allowing the electrode to contact the drum unit electrode through the natural motion of cartridge installation without requiring elastic elements.
Solution Approach 2:
The system transitions from a static spring-based contact mechanism to a dynamic pivotal movement mechanism. The boss structure enables the cartridge to pivot during installation, creating a natural motion that establishes and maintains contact pressure without continuous elastic force application, thereby reducing wear.
3Reliability
If the electrode is positioned at the end portion of the developing roller shaft, then electrical connection is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The boss structure serves as an intermediary element that facilitates precise electrode contact. Instead of requiring the electrode to be positioned with high precision relative to the developing roller shaft, the boss acts as a mediator that guides the cartridge into the correct orientation and position during pivotal movement, automatically establishing reliable electrical contact.
Solution Approach 2:
The boss structure performs the preliminary action of guiding and positioning the cartridge during installation. By establishing the correct geometric relationship between the cartridge and drum unit through pivotal movement around the boss, the system prepares the electrode contact interface before the actual electrical connection is made, reducing the precision requirements for electrode positioning.
Data Source
AI summary
A developing cartridge includes a casing having an outer surface, a developing roller, a first electrode, and a boss. The developing roller is movable together with the casing and includes a developing roller shaft extending along a first axis extending in a first direction. The developing roller is rotatable about the first axis. The first electrode is positioned at one end portion in the first direction of the developing roller shaft, and electrically connected to the developing roller shaft. The boss is positioned at one end portion in the first direction of the outer surface. The boss extends in the first direction and is engageable with the drum unit. A part of the first electrode is configured to contact with a second electrode of the drum unit as a result of pivotal movement of the developing cartridge about the boss relative to the drum unit.