Selective Gear Drive Mechanism for Image Forming Apparatus
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Solution Overview
Problem
Existing image forming apparatuses face difficulties in selectively transmitting rotation driving force to all developing rollers or only the black developing roller, and in using a motor as a driving source for other members, especially when switching between color and monochrome image formation modes.
Innovation Solution
An image forming apparatus with a rotation driving source, a black developing unit, a color developing unit, a first gear, a second gear, a development drive transmission mechanism, and a switching mechanism that allows for selective transmission of rotation driving force to either all developing rollers or only the black developing roller, enabling the motor to also drive other members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate gear trains are provided for black developing unit and color developing units, then each unit can be driven independently, but the motor cannot be used as a driving source for other members
Solution Approach 1:
The motor is designed to serve multiple functions: it drives the developing units through the gear train system and simultaneously acts as a driving source for other members of the color printer. This multi-functionality resolves the contradiction by allowing the motor to be versatile without requiring separate dedicated motors for each function.
Solution Approach 2:
A gear train system acts as an intermediary mechanism between the motor and the developing units. This gear train transmits and distributes the motor's rotational force to the appropriate developing units based on the operation mode (color or monochrome), enabling the motor to control multiple components without direct connection to each one.
2Adaptability or versatility
If the motor rotates in one direction for color image and opposite direction for monochrome image, then image formation modes can be switched, but the motor cannot be used as driving source for other members
Solution Approach 1:
The system dynamically adjusts the motor's operation mode based on the image formation requirement. The gear train configuration allows the motor to rotate in different directions (forward for color, reverse for monochrome) while maintaining its role as a universal driving source, thus achieving operational flexibility without sacrificing motor versatility.
3Reliability
If rotation driving force is transmitted to all developing rollers continuously, then all units are always ready, but unnecessary wear and toner damage occur
Solution Approach 1:
The developing rollers are activated periodically based on the actual image formation mode rather than continuously. The gear train system enables selective engagement of developing units - only the required units (black only for monochrome, all four for color) receive rotational drive, while others remain stationary. This periodic activation maintains reliability by ensuring units are ready when needed while preventing unnecessary wear and toner damage during idle periods.
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
Enables efficient and selective transmission of rotation driving force, reducing unnecessary wear and toner damage by allowing the motor to drive only necessary rollers, and utilizing it as a source for other components, thus enhancing operational flexibility and reducing the number of required driving sources.
Implementation Method 1
The switching mechanism includes a linear cam member configured to move linearly and to move the first intermediate gear and the second intermediate gear
Implementation Method 2
The first gear is configured to drive the black developing roller to rotate. The second gear is configured to drive the color developing roller to rotate. The development drive transmission mechanism is configured to transmit rotation driving force
Data Source
AI summary
An image forming apparatus includes a rotation driving source, a black developing unit, a color developing unit, a first gear, a second gear, a development drive transmission mechanism and a switching mechanism. The development drive transmission mechanism includes a first intermediate gear and a second intermediate gear. The switching mechanism includes a linear cam member configured to move linearly and to move the first intermediate gear and the second intermediate gear such that: in the first mode, the first gear engages the first intermediate gear and the second gear engages the second intermediate gear; in the second mode, the first gear engages the first intermediate gear and the second gear is disengaged from the second intermediate gear; in the third mode, the first gear is disengaged from the first intermediate gear.