Reciprocating Twist Rollers for Yarn Profile Control
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Solution Overview
Problem
Existing yarn production methods lack the ability to controllably vary the twist profile of yarns, which limits the properties of the resulting fabrics and knitted or woven products.
Innovation Solution
A yarn production apparatus featuring a reciprocating twisting stage with rollers that move along their axis of rotation, allowing for control of rotational speed and transverse movement, enabled by a microprocessor-based control system, to vary the twist imparted to the slivers or strands, and guides that adjust the path length of strands for staggered twist patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reciprocating twist rollers are used to impart twist to slivers, then yarn production is achieved, but the twist profile cannot be controllably varied
Solution Approach 1:
The patent applies dynamics by making the roller system adjustable and variable rather than fixed. The rollers can be repositioned along the sliver path, and their rotational speeds can be varied independently, allowing dynamic control of twist profiles. This transforms a static twisting mechanism into a dynamic one capable of producing different twist patterns.
Solution Approach 2:
The patent changes physical parameters of the twisting system, specifically the position of rollers along the sliver path and their rotational speeds. By varying these parameters, different twist profiles can be achieved. The ability to change roller position and speed independently enables controlled variation of twist characteristics in the yarn.
2Adaptability or versatility
If all slivers pass through the twisting stage together and are twisted naturally together, then multi-ply yarn is formed, but the twist profile is fixed and cannot be varied
Solution Approach 1:
The patent segments the twisting process by allowing different slivers to be twisted independently before being combined. Each sliver can receive different twist characteristics through independent roller control, and then these differently twisted slivers are brought together to form the multi-ply yarn. This segmentation enables varied twist profiles in the final yarn.
Solution Approach 2:
The patent applies preliminary action by twisting each sliver to a desired twist profile before the slivers are combined. The rollers impart the required twist to each individual sliver in advance, and then the pre-twisted slivers are brought together. This preliminary twisting action allows control over the final yarn's twist characteristics.
3Manufacturing precision
If the path length of strands is varied to create staggered twist patterns, then twist distribution is optimized, but the apparatus complexity increases
Solution Approach 1:
The patent uses guides as intermediary elements between the twisting stage and the yarn formation stage. These guides control the path length that each strand travels, creating the desired staggered twist patterns. The guides mediate the transition from independent sliver twisting to combined yarn formation, enabling precise twist distribution.
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
Enables the production of yarns with a wide range of twist profiles, resulting in fabrics and products with diverse properties, such as improved comfort and reduced blister formation in socks, by optimizing twist distribution and fiber interaction.
Implementation Method 1
a reciprocating twisting stage adapted to simultaneously twist one or more slivers to produce one or more twisted strands, including one or more rollers arranged to move reciprocally along the axis of rotation of the roller(s) to impart twist to the sliver(s)
Data Source
AI summary
An apparatus for producing a yarn including reciprocating twisting stage (4) adapted to simultaneously twist one or more slivers to produce one or more twisted strands, including one or more rollers (6a, 6b) arranged to move reciprocally (B) along the axis of rotation of the roller(s) to input twist to the sliver(s), and control means enabling control and variation of one or more of: (a) rotation speed of the rollers(s); (b) extent of transverse movement of the roller(s)s; or (c) speed of the transverse movement of the roller(s), to vary the twist imparted to the sliver(s) or strand(s).