Planetary Drive Mechanism Speed Adjustment
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Solution Overview
Problem
Conventional drive mechanisms for electro-photographic image forming apparatuses require a bulky structure to change gear speeds, leading to reduced service life due to frequent changes in gear mesh states.
Innovation Solution
A drive mechanism incorporating a rotational shaft, two-stage gear, ring gear, planetary gear, carrier, drive force transmission switching member, and one-way clutch, allowing for compact design and reduced gear mesh state changes, enabling efficient speed adjustment without compromising service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a speed-change mechanism with two pairs of gears is used to change the speed of drive force, then the speed adjustment function is achieved, but the structure becomes bulky and gear service life is reduced
Solution Approach 1:
The patent employs a planetary gear mechanism where gears are nested within each other in a compact coaxial arrangement. The sun gear, planetary gears, and ring gear are positioned concentrically, allowing multiple gear functions to be integrated in a small volume. This nested configuration eliminates the need for separate gear pairs and achieves speed change in a compact space.
Solution Approach 2:
The invention transitions from a linear arrangement of separate gear pairs to a radial/coaxial dimensional configuration. By utilizing the radial space around the rotational shaft and arranging gears in concentric layers, the mechanism achieves speed adjustment without extending the axial length, thereby reducing overall mechanism size.
2Adaptability or versatility
If the meshed states of gears are changed to adjust speed, then the speed change function is achieved, but the service life of gears is reduced
Solution Approach 1:
The patent uses a one-way clutch to enable dynamic switching between different gear meshing states. The clutch allows the planetary gears to freely rotate relative to the ring gear during certain operations, eliminating the need for forced disengagement and re-engagement of gear teeth. This dynamic control reduces impact loads and wear on gear teeth, extending service life while maintaining speed adjustment capability.
Solution Approach 2:
The one-way clutch acts as an intermediary element between the planetary gears and the ring gear, mediating the transmission of drive force. By introducing this intermediary, the system can smoothly transition between different operational modes without direct gear disengagement, thereby protecting the gear meshing interfaces from wear and extending their service life.
3Duration of action of stationary object
If a speed-change mechanism is used to decelerate drive force, then the developing roller service life is extended, but the drive mechanism becomes bulky
Solution Approach 1:
The planetary gear mechanism nested within the rotating assembly provides deceleration function in a compact form. The sun gear, planetary gears, and ring gear are arranged concentrically around the rotational shaft, creating a space-efficient deceleration mechanism that does not increase the overall footprint of the drive system.
Solution Approach 2:
The planetary gear assembly serves multiple functions simultaneously: it provides deceleration of the drive force, enables speed adjustment between different operational modes, and maintains a compact structure. This multi-functionality eliminates the need for separate mechanisms, achieving both service life extension and space efficiency.
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 proposed drive mechanism allows for compact and efficient speed adjustment of the developing roller, extending its service life by minimizing gear mesh state changes and maintaining performance across different operational speeds.
Implementation Method 1
The planetary gear is disposed between the sun gear of the two-stage gear and the inner teeth of the ring gear and engaged with both of the outer teeth of the sun gear and the inner teeth of the ring gear
Implementation Method 2
The one-way clutch is disposed coaxially with the rotational shaft and configured to allow the ring gear to rotate in one of a pair of opposite directions about the central axis of the rotational shaft and prohibit the ring gear from rotating in the other one of the pair of opposite directions
Data Source
AI summary
In a drive mechanism, a two-stage gear has an input gear and a sun gear. A planetary gear is engaged with both of outer teeth of the sun gear and inner teeth of a ring gear. A carrier, which is capable of rotating together with a rotational shaft, supports the planetary gear, and outputs drive force. A drive force transmission switching member switches between a connecting state connecting the two-stage gear and the carrier such that they rotate together via the rotational shaft, and a separating state separating the two-stage gear and carrier such that they rotate relative to each other. A one-way clutch allows the ring gear to rotate in one of a pair of opposite directions about the central axis of the rotational shaft, and prohibits the ring gear from rotating in the other one of the pair of opposite directions.