Ratchet Mechanism Noise Reduction in Image Formers
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Solution Overview
Problem
Conventional ratchet mechanisms in image forming apparatuses generate noisy collisions during reverse rotation, disrupting the quiet operation of toner conveying systems.
Innovation Solution
A ratchet mechanism with a rotatable drive member, a coupling member, and a biasing member that moves the coupling member between engagement positions, reducing contact and collision noise by regulating movement through inclined surfaces and contact portions, ensuring smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a biasing member is used to press the member toward the position before the movement, then the member can return to the position before the movement, but a collision sound is generated during the return movement
Solution Approach 1:
An intermediary member is introduced between the biasing member and the member that needs to return to the initial position. This intermediary member absorbs the collision energy and prevents direct contact between the biasing member and the member, thereby eliminating the collision sound while maintaining the return function
Solution Approach 2:
The intermediary member acts as a cushioning element that is positioned in advance to absorb the impact energy when the member returns to the initial position. This prior cushioning prevents the harmful collision sound before it can occur
2Ease of operation
If the engagement portion of the drive member rides over the inclined surface of the driven member during reverse rotation, then the drive is disengaged, but the member cannot return to the initial position without additional components
Solution Approach 1:
The function of the intermediary member serves dual purposes: it acts as a cushioning element to prevent collision sound and simultaneously functions as a return mechanism to bring the member back to the initial position. This merging of functions eliminates the need for separate return mechanism components
Solution Approach 2:
The intermediary member enables the system to return to the initial position automatically through the interaction between the biasing member and the inclined surface, without requiring additional active control or complex return mechanisms. The system serves its own return function through the existing components
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
The solution significantly reduces noise generation during the drive mechanism's operation, enhancing the quietness and reliability of the toner conveying process in image forming apparatuses.
Implementation Method 1
a biasing member disposed between the drive member and the coupling member in the rotation axis direction, the biasing member biasing the coupling member from the second position toward the first position
Data Source
AI summary
In a drive mechanism, a first engagement portion of a drive member includes a first contact portion capable of contacting with a second engagement portion in a case where a coupling member is at a first position and the drive member rotates in a first rotation direction, a second contact portion capable of contacting with the second engagement portion in a case where the coupling member is at a second position and the drive member rotates in the first rotation direction, and a third contact portion capable of contacting with the coupling member so as to regulate movement of the second engagement portion from the second position to the first position in a rotation axis direction when the coupling member is at the second position and the second contact portion and the coupling member are in a contact state by rotation of the drive member in the first rotation direction.