Drive Transmission Device Eccentricity Absorption
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Solution Overview
Problem
The existing drive transmission devices in image formation apparatuses, such as printers, face challenges in preventing vibration and image quality deterioration due to misalignment between driving and driven shafts, which often require larger sizes to accommodate eccentricity absorption and bias members, leading to increased device size and assembly complexity.
Innovation Solution
Incorporating an Oldham's coupling with a bias member inside the driving side coupling, which absorbs eccentricity between the driving and driven shafts, allowing for precise alignment and coupling without external bias members, thereby reducing the device's size and facilitating easier assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the driving gear and spring are overlapped in the radial direction, then the device size is reduced, but the driving gear and driving side coupling cannot be properly spaced in the axial direction
Solution Approach 1:
The patent moves the spring from the radial direction to the axial direction, placing it between the driving gear and the driving side coupling in the axial dimension. This dimensional transition allows the spring to provide biasing force without interfering with the radial overlap of the driving gear and coupling, thereby resolving the spatial conflict and enabling proper axial spacing while maintaining compact device size.
2Stability of the object's composition
If the diameter of driving gears is enlarged to suppress uneven rotations, then rotation stability is improved, but the overlap between driving gear and spring increases, requiring larger axial spacing
Solution Approach 1:
By relocating the spring to the axial direction, the patent eliminates the radial space conflict that would normally require increased axial spacing. This allows the driving gear diameter to be enlarged for rotation stability without proportionally increasing the overall device size, as the spring no longer competes for radial space.
3Reliability
If external bias members are used for coupling, then coupling reliability is improved, but device complexity and size increase
Solution Approach 1:
The patent integrates the biasing function directly into the driving side coupling structure by placing the spring between the driving gear and the coupling. This merging of the bias member with the coupling mechanism eliminates the need for separate external bias members, reducing assembly complexity while maintaining coupling reliability through the spring's internal biasing action.
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 solution effectively prevents vibration and image quality deterioration while downsizing the drive transmission device, ensuring precise rotation transmission and improved assembly efficiency.
Implementation Method 1
the driving side coupling includes an Oldham's coupling configured to absorb an eccentricity between the driving shaft and the driven shaft
Implementation Method 2
a bias member provided inside of the driving side coupling and configured to bias the driven side rotor toward the driven side coupling
Data Source
AI summary
A drive transmission device according to an embodiment may include: a driving shaft configured to be rotated by a driving source; a driven shaft; and a coupling device including a driving side coupling connected to the driving shaft and a driven side coupling connected to the driven shaft, and configured to selectively couple the driving shaft and the driven shaft with each other to transmit a rotation of the driving shaft to the driven shaft. The driving side coupling may include an Oldham's coupling including a driving side rotor, an intermediate rotor, and a driven side rotor and configured to absorb an eccentricity between the driving shaft and the driven shaft, wherein the driving side coupling further comprises a bias member provided inside of the driving side coupling, the bias member biasing the driven side rotor toward the driven side coupling.