Single-Motor Screw Shaft Synchronization for Conveyance Carriages
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Solution Overview
Problem
Conveyance devices face challenges in synchronizing the traveling speeds of left and right carriage units, leading to positional deviations and equipment cost inefficiencies, particularly in electric car and friction drive types.
Innovation Solution
A conveyance device with a pair of left and right screw shafts pivotally supported along movement paths, driven by a single motor through a transmission mechanism, ensuring synchronized and accurate propulsion of carriage units without individual motor control, reducing equipment costs and preventing speed variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual motors are used for each carriage unit, then speed control flexibility is improved, but equipment costs and control complexity increase remarkably
Solution Approach 1:
The patent combines multiple drive functions into a single motor. One motor drives both left and right carriage units through a differential mechanism, merging what would traditionally require two separate motors. This reduces equipment costs and control complexity while maintaining the ability to control speeds of individual carriage units through mechanical differentiation of the drive transmission.
2Device complexity
If friction drive wheels are used to move carriage units, then equipment simplicity is improved, but speed synchronization and stability deteriorate
Solution Approach 1:
The patent replaces the friction drive mechanical system with a positive engagement screw drive system. Instead of relying on friction between drive wheels and carriage surfaces, the invention uses screw shafts with engaged nuts or threaded components on the carriage units. This provides reliable speed synchronization through mechanical coupling while maintaining equipment simplicity, as the screw mechanism naturally ensures both carriages move at the same speed without complex electronic control.
3Measurement precision
If screw shafts are individually motor-driven, then speed control precision is improved, but the number of motors and equipment costs increase
Solution Approach 1:
The patent introduces a differential mechanism as an intermediary between a single motor and the two screw shafts. This differential allows one motor to drive both screw shafts while permitting controlled speed differences between the left and right carriages when needed. The differential acts as a mediator that translates single-motor rotation into coordinated rotation of two screw shafts, maintaining speed control precision without requiring two separate motors.
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 solution enables precise synchronization of left and right carriage units, reducing positional deviations and equipment costs, while maintaining accurate speed control and ease of maintenance, even over long conveyance paths.
Implementation Method 1
a pair of left and right screw shafts (8a, 8b) pivotally supported along respective movement paths of the carriage units (7a, 7b), a driven roller (35a to 35c) pivotally supported to each carriage unit (7a, 7b) and engaged with the screw shaft (8a, 8b)
Data Source
AI summary
A conveyance device has a carriage drive for driving and propelling a pair of left and right carriage units which individually support left and right sides of an object to be conveyed. A pair of left and right screw shafts is pivotally supported in a rotatable manner along the movement path of the carriage units. Driven rollers are pivotally supported in a rotatable manner by the carriage units and engage with the screw shafts. A transmission connects the pair of left and right screw shafts through the outside of a conveyance path such that the left and right screw shafts are linked and coupled; and a single motor drives the pair of left and right screw shafts through the transmission means.