Linear Contact Member for Developing Roller Separation
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Solution Overview
Problem
Existing image-forming devices with tandem-type configurations require multiple levers for developing roller contact and separation, leading to increased component count and variability in developing roller separation distances, especially when the separating lever is bent by the weight of the developing unit.
Innovation Solution
An image-forming device with a linearly movable contact/separation member aligned with the developing rollers, featuring a single elongated shape with multiple separating surfaces to uniformly contact and separate the developing rollers from the photosensitive drums, reducing the need for multiple levers and ensuring consistent separation distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple levers are provided for each developing unit, then the developing roller can be separated from the photosensitive drum, but the number of components increases
Solution Approach 1:
Multiple separate levers for each developing unit are merged into a single contact/separation member that can simultaneously contact and separate multiple developing rollers. This single member integrates the function of what would otherwise require multiple individual levers, reducing component count while maintaining the separation capability.
Solution Approach 2:
The contact/separation member is designed with multiple contact surfaces that can interact with multiple developing rollers simultaneously. This universal component performs the separation function for all developing units through a single actuation, making one component serve multiple functions that would traditionally require separate components.
2Reliability
If a separating lever is used to raise the developing unit, then the developing roller can be separated from the photosensitive drum, but the distance of separation varies among developing rollers due to lever bending
Solution Approach 1:
The contact/separation member is divided into multiple independent contact surfaces or segments, each capable of contacting its corresponding developing roller independently. This segmentation allows each contact point to maintain consistent separation distance without being affected by bending or deformation in other parts of the lever structure.
Solution Approach 2:
Instead of using a single lever that moves in one dimension (which can bend and cause inconsistent separation), the invention distributes contact points across multiple dimensions or positions. The contact/separation member engages multiple developing rollers at different locations simultaneously, transforming the separation mechanism from a single-point linear motion to a multi-point distributed contact system.
Data Source
AI summary
An image-forming device includes image carrying members aligned in a first direction in a main casing, one of the image carrying members being for black color, and remaining ones of the image carrying members being for other colors; a developing members provided in one-to-one correspondence with the image carrying members, each of the developing members configured to contact a corresponding image carrying member, one of the developing members being for black color, and remaining ones of the developing members being for other colors r; and a first contact/separation member linearly movable in the first direction, the first contact/separation member being disposed on one side of the plurality of developing members. The first contact/separation member comprises an elongated shape in the first direction. The first contact/separation member comprises a separating surfaces configured to contact respective developing members to separate the developing member from the image carrying member.