Automatic Document Feeder Transmission Gear Assembly
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Solution Overview
Problem
Traditional automatic document feeders require multiple motors and complex mechanisms to manage the rotation and direction changes of various rollers, leading to increased size and manufacturing costs.
Innovation Solution
A transmission device using a gear assembly with swing arms and cam gears that transmit torque to different rollers, allowing for direction changes and torque control without additional controllers, reducing the need for multiple motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple motors and complex mechanisms are used to manage rotation and direction changes of rollers, then the paper handling capability is improved, but the device volume and manufacturing cost increase
Solution Approach 1:
The patent combines multiple motor functions into a single motor by using a transmission mechanism that includes a motor, a first transmission gear assembly, a second transmission gear assembly, and a swing arm. This integrated system replaces what would traditionally require multiple separate motors, thereby reducing device volume while maintaining the capability to drive multiple rollers in different directions.
Solution Approach 2:
The single motor system is designed to perform multiple functions by changing the engagement state of different gear assemblies. The swing arm mechanism allows the same motor to drive different rollers (pickup roller, paper feed roller, paper out roller) in different operational modes, making the motor universal for multiple paper handling tasks.
2Adaptability or versatility
If multiple motors and complex mechanisms are used to manage rotation and direction changes of rollers, then the paper handling capability is improved, but the manufacturing cost increases
Solution Approach 1:
By merging multiple motor functions into a single motor system with gear assemblies and a swing arm, the patent reduces the total number of components that need to be manufactured and assembled. This consolidation directly lowers manufacturing costs while preserving the complex paper handling capabilities through clever mechanical design.
3Productivity
If the pressure roller presses against the paper out roller to transmit paper, then the paper transmission efficiency is improved, but the paper may be clamped and jammed during direction changes
Solution Approach 1:
The patent employs a dynamic pressure roller mechanism that can change its pressing force and engagement state. The swing arm connects the pressure roller to the transmission system, allowing the pressure roller to dynamically adjust its position and contact force with the paper out roller based on operational requirements, preventing paper jamming during direction changes.
Solution Approach 2:
The swing arm acts as an intermediary mechanism between the motor transmission system and the pressure roller. It mediates the transmission of motion and force, allowing the pressure roller to respond appropriately to different operational states without direct rigid connection, thereby preventing paper jamming while maintaining transmission 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
This solution simplifies the mechanism, reducing the volume and manufacturing cost of the automatic document feeder while maintaining efficient paper handling and scanning capabilities.
Implementation Method 1
A transmission device using a gear assembly with swing arms and cam gears that transmit torque to different rollers
Implementation Method 2
A transmission device using a gear assembly with swing arms and cam gears that transmit torque to different rollers
Data Source
AI summary
A transmission device of automatic document feeder includes a transmission gear assembly, a pickup transmission gear assembly, a paper-feed transmission gear assembly, a correction transmission gear assembly, a pressure transmission gear assembly and a turn-over transmission gear assembly. The transmission gear assembly includes a transmission roller, a first drive gear and a second drive gear. The pickup transmission gear assembly includes a pickup drive gear, a pickup swing arm and a pickup auxiliary swing arm. The paper-feed transmission gear assembly driven by the transmission gear assembly includes a paper-feed reverse gear and a paper-feed swing arm. And the correction transmission gear assembly and the paper-feed transmission gear assembly rotate towards the same direction. The pressure transmission gear assembly includes a pressure swing arm and a pressure actuating gear. The turn-over transmission gear assembly is driven by the first drive gear of the transmission gear assembly.