Technical Brief

Construction of a Carbon Fiber Reinforced Weft Guide Bar for a Crochet Knitting Machine

[+] Author and Article Information
Mathias Beer

Institut für Textiltechnik der,
RWTH Aachen University,
Aachen 52074, Germany
e-mail: mathias.beer@ita.rwth-aachen.de

Yves-Simon Gloy

Institut für Textiltechnik der,
RWTH Aachen University,
Aachen 52074, Germany
e-mail: yves.gloy@ita.rwth-aachen.de

Mohit Raina

Institut für Textiltechnik der,
RWTH Aachen University,
Aachen 52074, Germany
e-mail: mohit.raina@ita.rwth-aachen.de

Thomas Gries

Institut für Textiltechnik der,
RWTH Aachen University,
Aachen 52074, Germany
e-mail: thomas.gries@ita.rwth-aachen.de

Contributed by the Design Innovation and Devices Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received December 12, 2012; final manuscript received February 7, 2014; published online April 11, 2014. Assoc. Editor: Alexander Slocum.

J. Mech. Des 136(6), 064501 (Apr 11, 2014) (5 pages) Paper No: MD-12-1606; doi: 10.1115/1.4026822 History: Received December 12, 2012; Revised February 07, 2014

The crochet knitting machine is a warp knitting machine with a weft insertion system placed on a weft guide bar. On standard machines, the weft guide bar is made from aluminum and weighs about 570 g. The single-drive motors, which power the bar, account for 15–20% of the machines total power consumption. The aim of this research was to reduce power consumption by decreasing the mass of the weft guide bar. This was done by constructing the bar from carbon fiber reinforced plastics rather than aluminum, resulting in a mass saving of 260 g.

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Fig. 1

Top: crochet machine COMEZTRONIC CT-8B/600.V07 from COMEZ [5] and Bottom: basic components used for the crochet process [4]

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Fig. 2

Standard aluminum weft guide bar for COMEZ CT-8B machines

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Fig. 3

Top: Radial overbraiding machine with robot support; Bottom: Schematic overbraiding process

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Fig. 4

Mold in which resin is inserted

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Fig. 5

3D prototype of the wooden core

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Fig. 6

3D prototype of the mold base

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Fig. 7

3D prototype of the mold lid

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Fig. 8

List of manufacturing process steps

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Fig. 9

Finished carbon reinforced weft guide bar

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Fig. 10

Graphs of displacement, velocity, and acceleration of the weft guide bar

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Fig. 11

Determination of the bending stiffness of the weft guide bar

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Fig. 12

Three-point bending test

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Fig. 13

Draft and picture of the weft guide bar mounted in a demonstrator



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