Spinning Device Abrupt Braking for Short Yarn Effects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spinning machines struggle to produce yarn effects shorter than the fiber staple length and face challenges in achieving high production speeds and rapid switching due to mechanical complexity and mass inertia in drive systems.
Innovation Solution
The solution involves abruptly braking or stopping the delivery cylinder using actuators to compress fibers and create short, nub-like thickening effects, while using fast-switching drive components and low-inertia take-off rollers to enable quick acceleration and deceleration, and compensating for thin areas through controlled overfeeding by the feed rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional mechanical drive systems with planetary gears and chain drives are used, then yarn thickening effects can be produced, but the effects are limited to lengths greater than the fiber staple length and the machine cannot achieve high production speeds due to mass inertia
Solution Approach 1:
The patent segments the drive system by separating the delivery cylinder drive from the main drafting system. The delivery cylinder is driven independently via a separate motor and transmission, allowing it to be controlled without being constrained by the mass inertia of the entire mechanical drive train. This segmentation enables rapid speed changes and high production speeds that were impossible with the conventional coupled planetary gear system.
Solution Approach 2:
The patent implements dynamic control by using a programmable logic controller to independently regulate the delivery cylinder speed according to predetermined patterns. The system can rapidly accelerate and decelerate the delivery cylinder to create yarn thickening effects, with the speed profile being dynamically adjusted based on the desired flame length and position, enabling effects shorter than the fiber staple length.
2Manufacturing precision
If planetary gears and chain drives are used to transmit power to drafting cylinders, then yarn effects can be produced, but the quality of effect yarn suffers due to functional play in the chain drives
Solution Approach 1:
The patent extracts the delivery cylinder drive from the complex mechanical transmission system. Instead of using planetary gears and chain drives with inherent play, the delivery cylinder is driven directly by an independent motor through a simplified transmission. This extraction eliminates the functional play that degraded yarn effect quality while maintaining the ability to produce controlled thickening effects.
3Speed
If intermediate shafts and bypasses are added to accommodate transmission ratios, then power can be transmitted between cylinders, but the machine size increases and moving masses increase making sensitive regulation difficult
Solution Approach 1:
The patent segments the drive system so that the delivery cylinder operates independently from the main drafting system. This eliminates the need for intermediate shafts and bypasses that would be required to transmit power between closely spaced cylinders. The independent drive allows for compact machine layout while maintaining high regulation sensitivity through electronic control.
Solution Approach 2:
The patent replaces the mechanical power transmission system (intermediate shafts, gears, chain drives) with an independent electric motor drive for the delivery cylinder. This substitution eliminates the need for complex mechanical linkages, reduces moving masses, and enables sensitive speed regulation through electronic control systems rather than mechanical means.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a spinning device (2) and a method for producing effect yarn (35). Fibres (22) are compressed to form a preliminary thickness (33) by means of at least one delivery roller (7, 8) of a drawing system, by the abrupt braking of the at least one delivery roller (7, 8) by means of an actuator.