Removable Assembly Structure for Image Forming Apparatus
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Solution Overview
Problem
Existing image forming apparatuses face challenges in securely attaching and detaching assembly components, leading to potential degradation and misalignment issues during the attachment and removal processes, which can result in defects in toner images and increased wear on components.
Innovation Solution
A removable structure that includes a coupling member, a link member acting as a switch, an operation lever, and a blocking device, which allows for secure attachment and detachment of the fixing unit to the receiving member while preventing unintended removal or misalignment by blocking the operation lever's movement to the release position, thus reducing component degradation and image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the assembly is made removable for easy maintenance and replacement, then ease of operation is improved, but reliability deteriorates due to potential misalignment and degradation during attachment and removal
Solution Approach 1:
The coupling mechanism is divided into distinct functional components: a coupling member with connecting portions on the assembly, a corresponding coupling portion on the receiving member, and a separate restricting member that independently controls the attachment state. This segmentation allows each component to perform its specific function optimally while maintaining overall system reliability.
Solution Approach 2:
The connecting portions and coupling portions are pre-configured with aligned positions and geometries before assembly occurs. The restricting member is pre-positioned to automatically engage with the operation lever, ensuring that proper alignment is established before the actual attachment takes place, thereby preventing misalignment during the attachment process.
2Ease of operation
If the connection member is made movable to enable connection and disconnection, then ease of operation is improved, but manufacturing precision deteriorates due to potential misalignment during movement
Solution Approach 1:
The restricting member acts as an intermediary mechanism between the operation lever and the connecting portions. It mediates the movement process by providing guided motion paths and maintaining proper alignment relationships during the entire connection and disconnection sequence, thereby preventing misalignment even though the connection member is movable.
3Ease of operation
If the operation lever is made freely movable for easy assembly removal, then ease of operation is improved, but reliability deteriorates due to unintended removal
Solution Approach 1:
The restricting member introduces dynamic control to the operation lever's movement. Rather than being freely movable or completely fixed, the operation lever's movement is dynamically regulated based on the attachment state: it is constrained when connected to prevent unintended removal, and released when properly disconnected to allow easy operation. This dynamic behavior resolves the contradiction between operational convenience and attachment stability.
Data Source
AI summary
An assembly removable structure includes an assembly including a connectable member and attached to and removed from a receiving member of an apparatus body in a first direction, a connection member disposed on the apparatus body to be movable forward and backward in a cross direction that crosses the first direction, a switch member operated independently of a lid member and switching the connection member between a first position and a second position, the lid member rendering the receiving member open and closed, a restricting member that moves with an operation from a restriction position, at which the restricting member restricts the assembly from being removed from the receiving member, to a release position, at which the restricting member releases the assembly, and a blocking device restricting an operation of moving the restricting member to the release position when the switch member is switched to the first position.