Variable Speed Circular Comb Transmission for Combing Machines
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Solution Overview
Problem
Existing combing machines with variable speed circular combs for fibre processing face challenges due to complex mechanical components and unreliable independent motorization, leading to potential structural interference and harmful malfunctions.
Innovation Solution
A combing machine with a transmission device that converts a uniform circular movement into a non-uniform circular movement using an eccentricity and crank mechanism, allowing for variable rotation speed of the circular comb, synchronized with the nipper's movement, without complex gears or asymmetric components, utilizing an intermittent drive system for reliable and precise operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If independent motorisation is used for the circular comb, then variable rotation speed is achieved, but reliability deteriorates due to potential malfunction and harmful impact
Solution Approach 1:
The patent combines the motorisation of the circular comb with the existing drive system of the carding machine. The motor shaft of the circular comb is coupled to the main shaft of the carding machine through a transmission mechanism, so that both components share the same power source and control system, eliminating the reliability issues of independent motorisation while maintaining variable speed capability
Solution Approach 2:
The transmission mechanism serves multiple functions: it transmits power from the main shaft to the circular comb, enables variable rotation speed, and synchronizes the circular comb's motion with the nipper's reciprocating movement. This multi-functionality reduces system complexity and improves reliability by avoiding dedicated independent motorisation
2Speed
If asymmetric gears are used for variable speed, then rotation speed variation is achieved, but device complexity increases due to specific mechanical components
Solution Approach 1:
The patent employs a dynamic transmission mechanism where the circular comb's rotation speed varies continuously during its reciprocating motion cycle. The transmission system uses a crank mechanism connected to the main shaft, converting uniform rotation into variable speed reciprocating motion, thereby achieving speed variation without complex asymmetric gears
Solution Approach 2:
The transmission mechanism changes the motion parameters of the circular comb by converting constant rotational speed from the main shaft into variable rotational speed with reciprocating motion. The crank radius and eccentricity parameters determine the speed variation profile, allowing simple geometric parameters to control complex motion patterns
3Ease of manufacture
If the circular comb rotates at constant speed, then manufacturing simplicity is maintained, but structural interference occurs with the nipper movement
Solution Approach 1:
The circular comb's rotation speed is made dynamic rather than constant. The transmission mechanism causes the comb to rotate faster when the nipper is distant from tearing rollers and slower when the nipper is near, eliminating structural interference while maintaining manufacturability through a simple crank-based transmission
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 optimizes the synchronization of nipper and circular comb movements, reducing dynamic severity and structural interference, enhancing reliability and manufacturing simplicity while supporting high loads and minimizing wear, thus improving the efficiency and safety of the fibre processing.
Implementation Method 1
A combing machine with a transmission device that converts a uniform circular movement into a non-uniform circular movement using an eccentricity and crank mechanism
Implementation Method 2
A combing machine with a transmission device that converts a uniform circular movement into a non-uniform circular movement using an eccentricity and crank mechanism
Data Source
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AI summary
A combing machine is provided with a transmission device (30) for moving the circular comb at a variable speed. The transmission device 30 comprises a flat intermittent drive, which ensures highly reliable regular functioning.