Developer Carrying Member Flange Grooves for Adhesive Containment
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Solution Overview
Problem
The challenge in developing roller design is to prevent adhesive leakage onto the outer circumferential surface while ensuring strong adhesion between the sleeve and flange, which can lead to image defects and increased manufacturing costs due to the need for adhesive removal processes.
Innovation Solution
The developing roller design incorporates a flange with a specific groove structure that includes first, second, and third groove portions, where adhesive is applied only to the first groove portion, allowing it to be contained and preventing spread onto the sleeve surface, while maintaining robust adhesion through a press-fitting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to bond the flange and sleeve, then adhesion strength is improved, but adhesive may leak onto the sleeve surface causing image defects
Solution Approach 1:
The groove portion is divided into multiple segments (first groove portion, second groove portion, third groove portion) with different depths. This segmentation allows the adhesive to be contained in specific zones, preventing leakage while maintaining bonding strength. Each groove segment serves a specific function in controlling adhesive placement and containment.
Solution Approach 2:
The groove portion has non-uniform depth characteristics, with the second groove portion being deepest and the first and third groove portions being shallower. This local variation in groove depth creates different adhesive containment zones, allowing the adhesive to be securely held where needed while preventing overflow onto the sleeve surface.
2Ease of manufacture
If a simple flange structure is used, then manufacturing complexity is reduced, but adhesive containment and adhesion reliability deteriorate
Solution Approach 1:
The groove portion is segmented into three distinct sections with varying depths, creating a structured approach to adhesive containment. This segmentation provides reliable adhesive containment while maintaining a relatively simple overall flange structure that can be manufactured using conventional processes.
Solution Approach 2:
The groove portion extends in the circumferential direction around the fitting portion, adding a dimensional aspect to adhesive containment. This circumferential extension ensures comprehensive adhesive containment around the entire interface between flange and sleeve, improving reliability without significantly increasing manufacturing complexity.
3Strength
If adhesive is applied generously to ensure strong bonding, then adhesion strength is improved, but adhesive removal processes become necessary increasing manufacturing cost
Solution Approach 1:
The segmented groove structure with varying depths allows adhesive to be applied in controlled zones. The adhesive is contained within the groove portions, ensuring strong bonding while preventing excessive adhesive from spreading onto surfaces that would require removal. This eliminates the need for additional adhesive removal processes.
Solution Approach 2:
The groove portion is pre-formed on the flange before adhesive application. This preliminary structural preparation provides built-in adhesive containment, guiding the adhesive to the correct locations and preventing overflow before bonding occurs. This preliminary action eliminates the need for subsequent adhesive removal steps.
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
This design effectively prevents adhesive leakage, ensuring reliable adhesion strength between the sleeve and flange, reducing image defects and manufacturing costs by eliminating the need for additional adhesive removal processes.
Implementation Method 1
The adhesive bonds together the sleeve and the flange
Implementation Method 2
The magnet is fixed to an outer circumferential surface of the shaft
Data Source
AI summary
A developer carrying member includes a shaft, a magnet, a sleeve, a flange, and adhesive. The height from the bottom surface of a second groove portion to the outer circumferential surface of a first fitting portion is greater than the height from the bottom surface of a first groove portion to the outer circumferential surface of the first fitting portion. The height from the bottom surface of a third groove portion to the outer circumferential surface of the first fitting portion is smaller than the height from the bottom surface of the second groove portion to the outer circumferential surface of the first fitting portion, and is equal to or greater than the height from the bottom surface of the first groove portion to the outer circumferential surface of the first fitting portion.