Bidirectional Clutch Mechanism for Compact Image Forming Apparatus
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Solution Overview
Problem
Existing image forming apparatuses face challenges in reducing size and power consumption while accommodating bidirectional rotation of drive units, particularly with complex control requirements for planetary gear clutch mechanisms.
Innovation Solution
A clutch mechanism incorporating a rotatable input element, output element, transmission element with projections, and a rotation restriction device that uses an actuator to engage and disengage with the projections, allowing torque transmission in one direction and preventing it in the other, enabling efficient bidirectional rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a planetary gear clutch mechanism is used to reduce size and power consumption, then the apparatus becomes more compact and energy-efficient, but the control complexity increases due to the need for multiple solenoids to manage bidirectional rotation
Solution Approach 1:
The patent extracts the rotation direction control function from the planetary gear mechanism by introducing a separate rotation restriction device with a single solenoid. This device independently manages bidirectional rotation by engaging or disengaging the transmission element, thereby reducing control complexity while maintaining compact size.
Solution Approach 2:
The clutch mechanism is segmented into distinct functional components: the planetary gear mechanism for torque transmission, the rotation restriction device for direction control, and the actuator for operation. This segmentation allows each component to perform its specific function independently, simplifying the overall control system.
2Adaptability or versatility
If multiple solenoids are used to change rotation direction in a planetary gear clutch mechanism, then bidirectional rotation is achieved, but the device complexity and power consumption increase
Solution Approach 1:
The single solenoid-driven rotation restriction device performs multiple functions: it restricts rotation in one direction during forward rotation and restricts rotation in the opposite direction during reverse rotation. This multi-functionality eliminates the need for multiple solenoids while maintaining bidirectional rotation capability.
Solution Approach 2:
The rotation restriction device acts as an intermediary between the planetary gear mechanism and the output shaft. It mediates the rotation direction control by selectively engaging or disengaging the transmission element, thereby achieving bidirectional rotation with a single actuator.
3Power
If a planetary gear mechanism is used to transmit torque, then power transmission efficiency is improved, but the device complexity increases due to the need for additional components to manage rotation restriction
Solution Approach 1:
The rotation restriction function is merged with the planetary gear mechanism by integrating the transmission element directly into the gear structure. This merging reduces the number of separate components while maintaining effective torque transmission and rotation restriction capabilities.
Data Source
AI summary
A clutch mechanism includes a transmission element rotatable in a first direction and a second direction opposite to the first direction, integrally including a plurality of projections including a first planar surface and a second planar surface at each side of the projections in the direction of rotation of the transmission element, a rotation restriction device including a first restriction surface and a second restriction surface to contact the first planar surface and the second planar surface, to lock rotation of the transmission element, and a moving device including an actuator to move the rotation restriction device to contact and separate from the transmission element. The first restriction surface contacts the first planar surface while the transmission element rotates in the first direction, and the second restriction surface contacts the second planar surface while the transmission element rotates in the second direction.