Process Cartridge Positioning Structure for Stable Chip Contact
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Solution Overview
Problem
Conventional process cartridges in electrophotographic image forming apparatuses face issues with complex chip mounts leading to mold configuration complications and difficult mold release during manufacturing, and the risk of chip disengagement due to deflection under separation forces.
Innovation Solution
The process cartridge design includes a developing unit and photosensitive unit connected by side members, with a resetting member to apply force and a positioning member to maintain alignment, along with a simplified chip mount configuration that reduces wear and facilitates stable electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex chip mount configuration is used to ensure stable electrical contact, then reliability is improved, but device complexity increases and ease of manufacture deteriorates
Solution Approach 1:
The chip mount is divided into a mounting plate and a separate positioning member (protrusion), allowing independent optimization of each component's function while simplifying the overall structure and manufacturing process
Solution Approach 2:
The positioning function is extracted as a separate protrusion element from the chip mount body, enabling simplified mold design and easier manufacturing while maintaining stable electrical contact through the remaining mount structure
2Reliability
If a complex chip mount configuration is used to ensure stable electrical contact, then reliability is improved, but ease of manufacture deteriorates due to difficult mold release
Solution Approach 1:
The chip mount structure is segmented into simpler components with clear functional separation, allowing the use of standard mold designs that facilitate easy release during manufacturing while maintaining contact stability
Solution Approach 2:
The positioning member (protrusion) provides localized positioning function with simple geometry, allowing the majority of the chip mount to use straightforward structures that are easy to manufacture and release from molds
3Ease of operation
If a separation force receiving member is added to allow developing unit movement, then ease of operation is improved, but reliability deteriorates due to chip disengagement risk
Solution Approach 1:
The positioning member (protrusion) is designed in advance to counteract the deflection caused by separation forces, preventing chip disengagement before it can occur during developing unit movement
Solution Approach 2:
The positioning structure is pre-configured to maintain chip alignment during the separation process, ensuring continuous electrical contact is established before any potential disengagement issue can arise
4Reliability
If positioning member is added to prevent deflection, then reliability is improved, but device complexity increases
Solution Approach 1:
The positioning function is extracted as a simple protrusion element, separating it from the main chip mount body. This minimal addition provides necessary positioning stability without significantly increasing overall device complexity
Solution Approach 2:
Instead of making the entire chip mount complex to achieve positioning, a simple protrusion is added to the tray that provides positioning through a different mechanism, inverting the approach to achieve reliability with minimal complexity increase
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively suppresses deflection, ensuring stable electrical contact and simplifies chip installation and removal, reducing manufacturing complexity and enhancing reliability.
Implementation Method 1
a resetting member configured to elastically deform and apply a force to the photosensitive unit when the developing unit moves relative to the photosensitive unit
Data Source
AI summary
An image forming apparatus includes a tray configured to mount a process cartridge. The process cartridge includes: a developing unit provided with a developing member; a photosensitive unit provided with a photosensitive member; a side member disposed at a longitudinal end of the process cartridge, the developing unit and the photosensitive unit being arranged along a front-rear direction and movably connected by the side member; a resetting member configured to elastically deform and apply a force to the photosensitive unit when the developing unit moves relative to the photosensitive unit; and a positioning member provided on at least one of the side member and the photosensitive unit, the positioning member being configured to abut the tray in the front-rear direction when the developing unit moves relative to the photosensitive unit.