Rotation Device Varying Engagement Depth
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Solution Overview
Problem
In existing rotation devices, the contact unit or rotator that deforms during contact with the outer circumferential surface is not effectively inhibited from rapid restoration to its original state, leading to potential vibration and transfer failures in image forming apparatuses.
Innovation Solution
A rotation device with a rotator featuring a recessed portion on its outer surface, where the contact unit engages at a varying depth, including a contact surface at the upstream end with a second engagement depth less than the downstream depth, preventing excessive deformation and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact unit engages at a constant predetermined engagement depth across the entire recessed portion, then the structure is simple, but the contact unit or rotator rapidly restores to its original state causing vibration and transfer failures
Solution Approach 1:
The contact surface is designed with varying engagement depths at different locations. The upstream end portion has a second engagement depth that is less than the first engagement depth at the downstream portion, creating localized variations in contact characteristics to prevent rapid restoration and vibration
2Reliability
If the engagement depth is increased to prevent rapid restoration, then vibration is reduced, but the contact unit experiences excessive deformation
Solution Approach 1:
Different portions of the contact surface have different engagement depths tailored to their specific functional requirements. The downstream portion has greater engagement depth for vibration control, while the upstream end portion has lesser engagement depth to prevent excessive deformation, optimizing both aspects locally
Solution Approach 2:
The contact surface provides varying degrees of engagement depth rather than uniform excessive engagement. This partial action approach applies just enough engagement depth at each location to achieve the desired effect without causing excessive deformation or over-engineering
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 inhibits vibration and transfer failures, ensuring stable operation by controlling the engagement depths and allowing for easy replacement of the elastic layer, thus maintaining optimal performance over time.
Implementation Method 1
a contact unit that comes into contact with a portion of the outer circumferential surface in a range from an upstream end to a downstream end of the recessed portion in the rotation direction at a predetermined engagement depth... the contact unit or the rotator that deforms is rapidly restored to an original state
Data Source
AI summary
A rotation device includes a rotator that includes a recessed portion formed on an outer circumferential surface and that rotates in a predetermined rotation direction; a contact unit that comes into contact with a portion of the outer circumferential surface in a range from an upstream end to a downstream end of the recessed portion in the rotation direction at a predetermined engagement depth; and a contact surface that is formed at an upstream end portion in the range in the rotation direction and that comes into contact with the contact unit at a second engagement depth less than a first engagement depth at a portion downstream of the upstream end portion.