Device on a warp knitting machine for crocheting an elastic band

Details Device on a warp knitting machine for crocheting an elastic band Device on a warp knitting machine for crocheting an elastic band

1995-07-07

1997-08-05

Calvert, John J.

Textiles: knitting

United needle machines

Straight

66203, D04B 2508

Patent

active

056531273

DESCRIPTION:

BRIEF SUMMARY
The invention relates in a first aspect to a device on a warp knitting machine (crocheting machine) for crocheting a textile band. The device having crochet needles, a laying device, a front single welt laying device, and a rear single welt laying device. This device can produce a particularly fine rubber band having fleece on at least one broadside. Bands of this kind are intended to be suitable for ladies' underwear, especially for bras and have a very soft surface, namely a fleece, on at least one of their broadsides.
The device is intended to permit the production of very fine bands with a distribution of more than eight and especially twelve or more needles per centimeter of machine width. The fleece should be patternable to a variable extent, with the possibility of producing a patterned fleece on only one side or on both sides of the band.
Such elastic bands may also be produced by weaving. However, if produced by weaving the rubber threads running in the longitudinal direction of the band are thread-covered prior to the actual weaving procedure, thus involving additional production costs.
The present invention eliminates this additional thread covering operation and the rubber threads are to be mesh-covered in the course of the crocheting procedure. In this way the production costs as compared to those of weaving can be reduced by roughly 30%.
From the publications EP-A-0210 518 and GB-A-2 012 828, a device according to the preamble of claim 1 is known which serves to produce a pile loop knitted fabric, i.e. a knitted fabric having highly protruding loops, such as e.g. in bath towels. With devices of this kind it is not possible to achieve the designed high finess of the band, namely more than eight, particularly more than twelve crocheting members per centimeter of machine width, since pile loop holders and sinkers need to be introduced between the crochet needles, which have such widths, however, that it is no longer possible to arrange the crocheting needles alongside each other in the required density. Also the eye needles for feeding the weft threads have correspondingly large spacings with respect to each other.
The above stated requirements are satisfied in common by the invention according to its claim 1 (the following employing the terms also defined in the claims).
Expressions such as "front", "rear", "right", "left" relate to the usual viewing location of an observer standing in front of such a crocheting machine (B in FIGS. 1 to 3, 5 and 6).
From an older German patent application P 41 31 809.9, but not of prior disclosure, by the same applicant it is evident how crochet needles are clamped in a needle bar with which they are moved backwards and forward, how arrays of warp threads are supplied from the front by sets of eye needles, arrays of elastic threads are moved from above through combs and a front and a rear single weft thread is moved to the right-left-right by means of a separate tube for each crosswise to an array of elastic threads.
The high fineness of the band is achievable by the aforementioned and further crocheting members being arranged in the desired fineness, i.e. involving more than eight, but especially twelve or more crocheting members per centimeter of machine width, up to 16 crocheting members per centimeter being the target. How eye needles are arranged in the required number per centimeter of machine width is shown by EP-A-0 266 481-BERGER.
To form a fleece on the forward broadside of the band (as viewed from the point of observation B) the invention positions a weft array laying device in front of the web for the arrays of rubber threads. A single weft laying device; i.e. a device lays a single weft thread or however a bundle of parallel weft threads crosswise over the width of the array elastic threads, is provided in front of and behind the web of elastic thread array. The weft array laying device is movable backwards and forwards as well as being arranged to permit side shifting, so that depending on which of the weft needles guides a set of weft threads, a

REFERENCES:
patent: 4266411 (1981-05-01), Linder et al.
patent: 4389860 (1983-06-01), Schneider
patent: 4581905 (1986-04-01), Bonaschi
patent: 4708003 (1987-11-01), Berger et al.
patent: 4745781 (1988-05-01), Schuelein et al.
patent: 5452591 (1995-09-01), King

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