Independent Drive Rollers for Multi-Sliver Drawing
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Solution Overview
Problem
Current air-jet spinning machines are inefficient and costly for producing blended yarns from multiple fiber slivers due to the need for precise and separate processing of each sliver, which is difficult to achieve with existing technology, and they cannot handle carded cotton fibers effectively.
Innovation Solution
A drawing apparatus with independent drive rollers and adjustable thrust means allows for separate and precise drawing of multiple textile fiber slivers before they are fed into an air spinning chamber, enabling precise blending and processing of yarns with different qualities and materials, including carded cotton.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple slivers are processed separately with independent drawing rollers, then blending precision is improved, but device complexity increases
Solution Approach 1:
The drawing frame is divided into multiple independent drawing units, each equipped with its own drive roller and idle roller. Each unit can process a separate sliver independently, allowing different drawing ratios and processing parameters for each sliver. This segmentation enables precise control over individual slivers while maintaining overall system functionality.
Solution Approach 2:
The patent implements variable speed control for each drive roller, allowing the rotational speeds to be dynamically adjusted independently. This enables the drawing ratio of each unit to be changed according to the specific requirements of different slivers, providing flexibility and precision in the blending process without requiring complete redesign of the mechanical structure.
2Device complexity
If traditional single sliver processing is used, then device complexity is reduced, but blending quality deteriorates
Solution Approach 1:
The drawing frame is divided into multiple independent drawing units, each equipped with its own drive roller and idle roller. Each unit can process a separate sliver independently, allowing different drawing ratios and processing parameters for each sliver. This segmentation enables precise control over individual slivers while maintaining overall system functionality.
Solution Approach 2:
The drawing frame is designed with multiple drawing units that can process different types of slivers (carded, combed, different materials, different colors) simultaneously. Each unit is universally capable of handling various sliver types while maintaining independent control, allowing the same device to produce high-quality blends of different fiber combinations.
3Length of moving object
If carded cotton is processed alone, then fiber length is preserved, but homogeneity deteriorates
Solution Approach 1:
The patent combines carded cotton slivers with combed cotton slivers in the same blended yarn production process. By processing both types of slivers through separate drawing units and then blending them in the air-jet spinning chamber, the system achieves both preservation of fiber length (from carded cotton) and improvement of homogeneity (through combination with combed cotton).
Solution Approach 2:
The patent changes the drawing ratio parameter for different sliver types to optimize their properties before blending. Carded cotton slivers can be given different drawing ratios compared to combed cotton slivers, allowing optimization of fiber alignment and length preservation while preparing them for effective blending in the spinning chamber.
4Stability of the object's composition
If blended slivers are processed repeatedly, then homogeneity is improved, but production time increases
Solution Approach 1:
The patent performs preliminary drawing and preparation of multiple slivers in parallel before they enter the spinning chamber. By preparing all necessary slivers simultaneously with appropriate drawing ratios and configurations, the system eliminates the need for repeated processing cycles, achieving homogeneity through initial precise preparation rather than iterative refinement.
Solution Approach 2:
The multiple drawing units operate continuously and simultaneously on different slivers, maintaining continuous production flow. This parallel processing approach ensures that all slivers are prepared and ready for blending without interruption or repeated cycles, significantly reducing production time while maintaining homogeneity through continuous operation.
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 enables efficient and precise blending of yarns with different qualities and materials, reducing production costs and enabling the use of carded cotton, while maintaining high yarn quality and precision in the drawing process.
Implementation Method 1
a drawing device (24), placed between the introducer elements (8, 12) and the air spinning device (16), comprising a plurality of pairs of drawing rollers (28)... suitable to perform a progressive drawing of each sliver (N1, N2) simultaneously intercepted thereby
Data Source
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AI summary
A drawing apparatus (4) for air spinning machines with multiple feeds, comprising: - a first and a second introducer element (8,12), so as to be able to feed simultaneously two separate slivers (N1, N2), - an air spinning device (16), - a drawing device (24), comprising a plurality of pairs of drawing rollers (28), comprising one drive roller (32) and one idle roller (36) per pair, - at least one drive roller (32) of a pair of said drawing rollers (28), is mechanically split into a first drive roller (40) which intercepts a first sliver (N1) and a second drive roller (44) which intercepts the second sliver (N2), - said first and second drive rollers (40,44) being operatively connected to separate drive means so that they may be operated at different speeds of rotation, - wherein said first drive roller (40) is associated with a first idle roller (52) and said second drive roller (44) is associated with a second idle roller (56), said idle rollers (52,56) being mechanically separate from each other.