Extended horn gears in 3D maypole braiding

Self Cite

The pattern changes on the 3D rotary braiding machines (maypole principle with horn gears with full and empty slots) require complex planning of the carrier positions and timing and allow for production of bifurcated and other complex braids with variable cross sections for medical and technical applications. Another common application of pattern changes is to make a visually different pattern for marking of the remaining length of rope when used in a climbing context or for generally lengthened pieces for medical sutures. The development of such samples has previously been done using the trial-and-error method. This paper presents one rule for supporting a more systematic and purposeful trial, which significantly speeds up the development process. After a short review of the related literature, the main theoretical background is given and two practical cases for pattern change are demonstrated. The patterns were developed using numerical simulation before being tested on a real braiding machine. With this paper the authors hope to give some motivation for the remaining braiders in the world to continue working on the development of systematic rules for this complex process.

Section: Planning Of the Pattern And Machine Controlmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

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Carrier delay-based method for development of the tracks for the transitions between patterns on 3D braiding machines with continuous rotating horn gears

Gleßner¹,

Kyosev

2021

Self Cite

“…The application of ropes for daily tying, tying, bundling, and wrapping 2 is extensive, such as various ropes used in textiles, surgical ropes in the medical and health fields, ropes for industrial hanging, and various engineering composite pipes. 3–5 Binding rope of various materials involves complex mechanical behavior, and the interaction of the materials with each other maintains the rope’s structural form, which involves the rope's tension state and the bundled material's tightening effect. 6 The end of the rope is tensioned by tension, which induces deformation of the rope body.…”

mentioning

confidence: 99%

Calculation of the depth of rope-tightening soft material and analysis of its relationship with the tightening force

Li,

Guangming,

et al. 2023

To analyze the relationship between the tension force of a rope and the bundled material's indentation, a model of tightening by rope for soft material was designed for testing. By calculating the indentation depth of soft materials from rope stretching displacement, the variation law of the indentation depth of tightening soft materials with different mechanical properties of ropes was analyzed. As the stretching progresses, the more the rope winding turns, and the shallower the indentation depth. The friction coefficient between the soft material and the rope does not significantly affect the theoretical indentation depth. The theoretical indentation depth of high-strength ropes shows a linear variation pattern. The theoretical indentation depth of high-extension ropes is negative. With the theoretical indentation depth of the ordinary rope increasing first and then decreasing, its indentation depth curve shows a parabolic shape. Aromatic polyester rope, cotton chainette thread, and polypropylene rope were used to tighten ethylene-vinyl acetate (EVA) foam and test the indentation depth. The results show that the deformation of the rope is much lower than that of the EVA foam, and the depth of the strangulation is closely related to the tensile displacement and tightening tension. The measured value of the indentation depth is lower than the calculated value, and the greater the stiffness of the rope, the smaller the difference between the measured and calculated indentation depth. The indentation depth method was used to calculate the tightening effect of ropes with high rigidity and has excellent results.

“…The machine development and the carrier arrangement are done by trial and error, and the fundamental theoretical background is not well developed. 2 The monograph written by Kyosev 3,4 introduced the principles of the rotary braiding process and the structures of various rotary braiding machines. Other studies focused on the mechanical analysis of yarns and the structural designs of mechanisms, tracks and carriers.…”

mentioning

confidence: 99%

Modeling and analysis of the carrier arrangement in square rotary braiding

Meng

Zhang

et al. 2019

In this paper, the carrier arrangement for manufacturing fabrics with a symmetrical cross-section using multi-layer interlocking braiding technology based on square rotary braiding is studied. To obtain a suitable arrangement, the paper defines a matrix to describe the state of each slot of the horn gears. The possible types of transfer positions are analyzed, and the rules of arrangement are made. A mathematical model is established to determine the possible carrier positions. Using the model, the carrier arrangements for I-section and C-section preforms are obtained. This model is helpful in solving the carrier arrangement for all types of fabrics with symmetrical cross-sections in engineering applications.