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2 2020

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Functional Model of a Warp-Knitted Machine for Producing 3D Technical Knitted Fabrics

Michalak Andrzej, Mikołajczyk Zbigniew

Fibres & Textiles in Eastern Europe

2020

Vol. 28, no. 5 (143)

97--105

The article describes the construction and testing of a functional model of an innovative warp – knitting machine for technical spatial knitted fabrics with an original structure. Design assumptions regarding the geometrical, kinematic and driving characteristics of the machine are described. The functional model as well as its physical implementation as a research stand are presented. The production phases of the 3D knitted fabric are also demonstrated. The research results are described and their importance for the construction of a machine prototype of the production version are emphasised.

W artykule opisano konstrukcję i badania modelu funkcjonalnego innowacyjnej osnowarki do technicznych dzianin przestrzennych o oryginalnej strukturze. Przedstawiono założenia projektowe dotyczące geometrii, kinematyki i napędów maszyny. Zaprezentowano projekt modelu funkcjonalnego oraz jego fizyczną realizację jako stanowiska badawczego. Opisano fazy tworzenia dzianiny 3D. Przedstawiono wyniki badań oraz podkreślono ich znaczenie dla budowy prototypu maszyny w wersji produkcyjnej.

Impact of Whip Roller Parameters on Warp Dynamic Loads for 3D Fabrics Made on a Four-Comb Warp-Knitting Machine

Michalak Andrzej, Kuchar Maciej, Mikołajczyk Zbigniew

Autex Research Journal

2020

Vol. 20, no. 1

73--77

The most advantageous geometry of the warp feeding system was determined from the viewpoint of compensating temporary changes in the warp length during the technological cycle of a four-comb warp-knitting machine. Dynamic simulations of the feeding system were carried out for 3 different lengths of the shift of the slider with a guide bar – designating variants (series) of the cross-sectional sizes of the 3D knitted fabrics. The courses of instantaneous warp tensions during the operating cycle of the warp-knitting machine were presented. Limit dynamic loads of the warp were determined and presented as a function of natural frequency of the whip roller. Based on the criterion of the smallest dynamic loads of the warp, the optimum natural frequencies of the whip roller were determined. In the analyzed range of the whip roller parameters, they are 3–6 times greater than the operation frequency of the warp-knitting machine.