Textiles: knitting – United needle machines – Straight
Patent
1992-09-22
1994-07-12
Crowder, Clifford D.
Textiles: knitting
United needle machines
Straight
66205, 139 551, D04B 2726
Patent
active
053277503
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a warp knitting machine, particularly crochet galloon machine with at least one control arrangement for the shifting movement of at least one guide bar which is pretensioned against a pick-off gear, which contains a plurality of thrust elements arranged one after the other and supported at radial cams (34, 60) of displacement elements of different displacement steps with the displacement elements adjustable, between a basic position and a switched position, via coupling members by an adjusting device which can be controlled by a pattern.
Such a warp knitting machine is known e.g. from DE-PS 467 899. A Jacquard mechanism serves as adjusting device and the displacement elements are actuated by change-over levers having two high and two low stops located opposite one another. In correspondence with the Jacquard card, these stops are brought into the area of stop bars, which oscillate one within the other cyclically, in such a way that the displacement elements are adjusted according to pattern and fixed at the end of the switching lift. A great disadvantage consists in that the Jacquard needles, and accordingly the displacement elements, must execute a complete working stroke or lift, i.e. a complete reciprocating movement, for every revolution of the warp knitting machine. This causes the displacement elements to be reciprocated suddenly between the thrust elements and the guide bar accordingly also changes position suddenly. This causes great stress on all mechanical parts and damaging and noisy bouncing effects result. Such a warp knitting machine not only has a complicated construction, but is subjected to high wear and produces considerable noise. Accordingly, the warp knitting machine can also only be moved at relatively slow speeds.
DE-PS 31 17 683 describes another warp knitting machine of the type mentioned in the beginning, each adjusting device having an eccentric which is rotatable by 180.degree. when controlled and connected with a displacement element by a positive-locking coupling member. This displacement element is constructed as a roller which can be displaced along a radial cam arranged at a thrust element. A disadvantage of this arrangement consists in that the adjusting device must execute a complete work lift, i.e. a reciprocating movement, during a revolution. The performance of this warp knitting machine is accordingly likewise limited.
SUMMARY OF THE INVENTION
It is the object of the invention to construct a warp knitting machine of the type mentioned in the beginning in such a way that it enables a higher output with a simple construction.
This object is met according to the invention by the construction of the adjusting device as a negative dobby or Jacquard machine operating by the double-lift method and connected via the coupling members with displacement elements which are pretensioned in one position. Simple construction is provided in that the adjusting device is constructed as a negative dobby or Jacquard machine operating by the double-lift method, since the adjusting device need only ensure the displacement of the displacement element in one direction, while adjustment is effected in the other direction by means of a pretensioning force. The double lift means that two drive elements acting in a counter-cyclical manner act on the coupling member via a connecting link in such a way that every drive element need execute only one lift per revolution of the warp knitting machine to actuate the coupling link. Accordingly, such a warp knitting machine can be operated at a substantially higher drive speed and a gentle movement of the displacement elements is nevertheless effected. This results in higher speeds of the warp knitting machine with a simultaneous decrease in wear and reduced noise.
Such negative dobby or Jacquard machines operating by the double-lift method are known e.g. from Hans Walter Kipp, "Ribbon Weaving [Bandwebtechnik]", Frick 1988, pages 47 to 77.
The adjusting device for every coupling member has two
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patent: 3835894 (1974-09-01), Speich
patent: 4139997 (1979-02-01), Riesen
patent: 4312196 (1982-01-01), Englert
patent: 4414826 (1983-11-01), Mista et al.
patent: 4458508 (1984-07-01), Englert et al.
patent: 4614095 (1986-09-01), Porat
Calvert John J.
Crowder Clifford D.
Textilma AG
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