The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
D. Samuel Wesley - One of the best experts on this subject based on the ideXlab platform.
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Study on dynamic needle thread tensions in a single needle lock stitch (SNLS) sewing machine. II. Effect of sewing speed, thickness of fabric plies, thread linear density and pre-tensions of threads
Fibers and Polymers, 2014Co-Authors: R. S. Rengasamy, D. Samuel WesleyAbstract:This paper reports on the effect of pre-tensions on needle and bobbin threads, sewing speed, thickness of fabric plies and the linear density of the threads on the tension peaks occurring on needle thread during sewing on a single needle lock stitch machine. The needle thread tensions are measured at two locations: above the needle bar (bottom segment) and above the needle thread Tensioner (top segment). A factorial design approach is used to study the four parameters. The role of bobbin tension is studied in a separate experiment, while keeping the pre-tension on the needle thread constant. The highest tension observed on the needle thread is the stitch tightening tension which is directly affected by the pre-tension set on the needle thread Disc Tensioner. Heavier threads develop lower tightening tension which may affect the seam balance. The thickness of fabric plies does not affect the needle thread tension. Sewing speed has marginal influence on the stitch tightening tension near the needle thread Tensioner. The pre-tension on the bobbin thread affects only the needle thread tension when the take up lever pulls up the needle thread loop to release it from the rotary shuttle hook gib.
Hai Xia Zhao - One of the best experts on this subject based on the ideXlab platform.
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analysis of working characteristics of coreless Disc Tensioner in winding machine
Advanced Materials Research, 2013Co-Authors: Hai Xia ZhaoAbstract:The paper introduces the structure and working principle of coreless Disc Tensioner, using Euler tension formula to calculate the output tension, analyzing the yarn diameterin ideal and actual situations and getting amplification characteristics of the Disc Tensioner against tension fluctuation. It is found that the tension Disc will not expand the tension fluctuation amplitude in ideal condition, and its own performance has certain compensation for the tension fluctuation, which provides a the oretical basis for the design of the coreless Disc Tensioner and its wide application.
R. S. Rengasamy - One of the best experts on this subject based on the ideXlab platform.
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Study on dynamic needle thread tensions in a single needle lock stitch (SNLS) sewing machine. II. Effect of sewing speed, thickness of fabric plies, thread linear density and pre-tensions of threads
Fibers and Polymers, 2014Co-Authors: R. S. Rengasamy, D. Samuel WesleyAbstract:This paper reports on the effect of pre-tensions on needle and bobbin threads, sewing speed, thickness of fabric plies and the linear density of the threads on the tension peaks occurring on needle thread during sewing on a single needle lock stitch machine. The needle thread tensions are measured at two locations: above the needle bar (bottom segment) and above the needle thread Tensioner (top segment). A factorial design approach is used to study the four parameters. The role of bobbin tension is studied in a separate experiment, while keeping the pre-tension on the needle thread constant. The highest tension observed on the needle thread is the stitch tightening tension which is directly affected by the pre-tension set on the needle thread Disc Tensioner. Heavier threads develop lower tightening tension which may affect the seam balance. The thickness of fabric plies does not affect the needle thread tension. Sewing speed has marginal influence on the stitch tightening tension near the needle thread Tensioner. The pre-tension on the bobbin thread affects only the needle thread tension when the take up lever pulls up the needle thread loop to release it from the rotary shuttle hook gib.
Arunangshu Mukhopadhyay - One of the best experts on this subject based on the ideXlab platform.
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Impact of Positive Thread Feeding for High-Speed Industrial Lockstitch Sewing Machines: Part I Development of Device
Journal of The Institution of Engineers (India): Series E, 2019Co-Authors: Vinay Kumar Midha, Vaibhav Gupta, Arunangshu MukhopadhyayAbstract:During high-speed industrial lockstitch sewing, repeated stresses and strains on the needle thread adversely influence its sewing performance. The sewing performance of threads is affected by reduction in its tensile strength. For maximum strength retention of needle thread, a positive thread feeding device is developed, which is independent of the fabric feed mechanism as in conventional sewing, where sewing thread is pulled from the cone directly wherein the thread feed is controlled by spring Disc Tensioner and needle movement. The dynamic needle thread tension is measured above the needle bar using strain gauge load cell. The load cell converts force or weight into electrical signal. The highest thread tension (stitch tightening tension) occurs when the take-up lever pulls the required thread amount through the spring Disc Tensioner. Positive thread feeding of needle thread lowers the tightening tension (peak tension), and hence, strength retention of needle thread is observed. In this paper, the breaking force of mercerized cotton needle thread at various sewing variables, viz. fabric density, number of fabric layers, and stitch length, is studied during conventional sewing and also by using positive thread feeding device. The loss in breaking force increases with the increase in fabric density, whereas it decreases as the number of fabric layers and stitch length increased.
Vinay Kumar Midha - One of the best experts on this subject based on the ideXlab platform.
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Impact of Positive Thread Feeding for High-Speed Industrial Lockstitch Sewing Machines: Part I Development of Device
Journal of The Institution of Engineers (India): Series E, 2019Co-Authors: Vinay Kumar Midha, Vaibhav Gupta, Arunangshu MukhopadhyayAbstract:During high-speed industrial lockstitch sewing, repeated stresses and strains on the needle thread adversely influence its sewing performance. The sewing performance of threads is affected by reduction in its tensile strength. For maximum strength retention of needle thread, a positive thread feeding device is developed, which is independent of the fabric feed mechanism as in conventional sewing, where sewing thread is pulled from the cone directly wherein the thread feed is controlled by spring Disc Tensioner and needle movement. The dynamic needle thread tension is measured above the needle bar using strain gauge load cell. The load cell converts force or weight into electrical signal. The highest thread tension (stitch tightening tension) occurs when the take-up lever pulls the required thread amount through the spring Disc Tensioner. Positive thread feeding of needle thread lowers the tightening tension (peak tension), and hence, strength retention of needle thread is observed. In this paper, the breaking force of mercerized cotton needle thread at various sewing variables, viz. fabric density, number of fabric layers, and stitch length, is studied during conventional sewing and also by using positive thread feeding device. The loss in breaking force increases with the increase in fabric density, whereas it decreases as the number of fabric layers and stitch length increased.