Pressing Device Cam Mechanism Noise Reduction
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Solution Overview
Problem
Existing image forming apparatuses experience abnormal noise due to contact between the cam and cam follower in the pressing rotator moving mechanism, which affects the operation and noise levels during the fixing process.
Innovation Solution
The pressing rotator moving mechanism incorporates a cam with a shorter distance from the arm rotation center to the cam rotation center compared to the cam follower rotation center, ensuring smooth contact and separation, and an elastic member to bias the arm, stabilizing the operation and preventing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cam and cam follower are positioned with equal or large distance from the arm rotation center, then the mechanical leverage is sufficient, but abnormal noise occurs due to contact between the cam and cam follower
Solution Approach 1:
The patent changes the geometric parameter of the mechanism by positioning the cam rotation center closer to the arm rotation center than the cam follower rotation center. This parameter change modifies the contact characteristics between the cam and cam follower, ensuring smooth operation and preventing abnormal noise while maintaining sufficient mechanical leverage through the optimized distance relationship.
2Force
If the cam follower is positioned far from the arm rotation center, then the pressing force is amplified, but the contact between cam and cam follower produces abnormal noise
Solution Approach 1:
The patent optimizes the force amplification by adjusting the distance parameters. The cam rotation center is positioned at a distance R1 from the arm rotation center, while the cam follower rotation center is at distance R2, where R1 < R2. This parameter configuration maintains sufficient pressing force while ensuring smooth contact and preventing abnormal noise during operation.
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 configuration effectively prevents abnormal noise by ensuring continuous and smooth contact and separation of the cam and cam follower, enhancing the operational stability and noise reduction in the fixing device.
Implementation Method 1
an elastic member, which biases the arm in a direction in which the pressing rotator contacts the rotatable member
Data Source
AI summary
A pressing rotator can contact a rotatable member. An arm rotatably supports the pressing rotator and changes the distance from a rotation center of the pressing rotator to the rotatable member by rotation. A pusher is rotatable around a rotation center of the arm. An elastic member is located between the arm and the pusher and biases the arm in a direction in which the pressing rotator contacts the rotatable member. A cam follower is mounted on the pusher. The cam can contact A cam follower and is rotatable around a first rotation center. The distance from the rotation center of the arm to the first rotation center of the cam is shorter than the distance from the rotation center of the arm to the center of the cam follower.