Drafting System Cage Element Frictionless Force Transmission
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Solution Overview
Problem
Existing drafting systems for ring spinning machines often result in edge fibers due to uneven integration of fibers into the yarn structure, leading to inconsistent loading forces in the compression zone, which affects yarn quality.
Innovation Solution
A drafting system design featuring a cage element with a first guide and receiving device having a slightly larger clear diameter than the output rollers' axis, with a loading spring connected to the pendulum support via a movable intermediate member, such as a rolling body or link, to ensure a friction-free transmission of loading forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the loading spring is directly connected to the cage element, then the loading force is transmitted to the delivery top rollers, but friction occurs between the spring and cage element leading to force fluctuations
Solution Approach 1:
A frictionless connection element (rolling body or pivot bearing) is introduced as an intermediary between the loading spring and the cage element. This intermediary transfers the loading force from the spring to the cage element without creating friction, thereby eliminating the force fluctuations that would otherwise occur and ensuring constant loading force transmission.
Solution Approach 2:
The direct frictional mechanical connection between the loading spring and cage element is replaced with a frictionless mechanical system (rolling body or pivot bearing). This substitution eliminates the harmful friction effect while maintaining the force transmission function, converting a friction-based mechanical connection into a frictionless one.
2Manufacturing precision
If the cage element is rigidly guided, then the axis guidance is precise, but the loading force transmission creates friction and force fluctuations
Solution Approach 1:
The frictionless connection element serves as an intermediary that decouples the guidance function from the force transmission function. The cage element can be precisely guided through the frictionless connection while the loading force is transmitted separately without friction, resolving the contradiction between precise guidance and constant force transmission.
3Manufacturing precision
If the clear diameter of the guide device is exactly equal to the axis diameter, then the guidance is precise, but the loading spring cannot be connected without creating friction
Solution Approach 1:
The frictionless connection element (rolling body or pivot bearing) is introduced as an intermediary that enables the loading spring to be connected to the cage element without direct frictional contact. This intermediary allows the guide device to maintain its precise clear diameter matching while still permitting friction-free force transmission through the rolling or pivoting mechanism.
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 design maintains a constant loading force during spinning, preventing fluctuations and improving yarn quality by ensuring precise guidance and force transmission to the delivery top rollers.
Implementation Method 1
the intermediate member is designed as a rolling body which is movably mounted in a guide device of the cage element
Implementation Method 2
a loading spring (15) connected with one end (20) to the pendulum support (5) of the drafting system (1) in a stationary manner and is connected in the area of its opposite, free end (21) via a movable intermediate member (16) to the delivery top rollers (11o) or to the cage element (25) accommodating the delivery top rollers (11o)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The equipment (1) has delivery upper rollers (11o) connected to outlet upper rollers (40) over a cage element (25) that comprises a guiding and receiving unit (29), where a clearance diameter of the receiving unit is greater than a diameter of an axle (13) of the outlet rollers. The cage element is mounted at the outlet rollers. An end of a load spring (15) i.e. leaf spring, is connected to a pendulum support (5). An opposite free end of the load spring is connected with the cage element retaining the delivery rollers via a movable connecting link (16), an axle (17) and a control lever.