Textiles: braiding – netting – and lace making – Apparatus – Shuttles – carriages and/or threading and loading or...
Patent
1994-10-03
1996-12-17
Stodola, Daniel P.
Textiles: braiding, netting, and lace making
Apparatus
Shuttles, carriages and/or threading and loading or...
87 22, 87 61, D04C 318
Patent
active
055842232
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Art
This invention relates to yarn tensioning method and device suitable for use on textile weaving machines, and more particularly to yarn tensioning method and device which can be effectively used especially on textile weaving machines for fabrication of three-dimensional braids such as square braider, magnaweave, three-dimensional braider and the like.
2. Prior Art
In case of a weaving machine which is directed to the fabrication of braid type three-dimensional fabrics as disclosed in Japanese Laid-Open Patent Application H4-41756, namely, in case of a weaving machine which is arranged to produce three-dimensional fabrics by interweaving yarns fed from a number of yarn carriers, which are driven from a carrier drive mechanism to shift the respective positions along predetermined loci of movements in a common carrier moving plane, it is necessary to provide a yarn orientation angle setting means in order to make the orientation angles of the respective yarns substantially uniform by beating actions in a stabilized manner or in order to control the yarn orientation angles arbitrarily.
The inventor of the present invention proposed an effective means for setting such orientation angles in a prior Japanese Patent Application H4-180408. In a weaving process by a braid type three-dimensional textile weaving machine without an orientation angle setting means of this sort, the greater the yarn draw-out rate in each weaving cycle of the textile to be fabricated, the smaller becomes the orientation angle of the textile. If the orientation angle becomes too small, the resulting fabric cannot be regarded as substantially three-dimensional fabric any longer.
On the other hand, in case of the above-mentioned braid type three-dimensional textile weaving machine, the yarn orientation angle in three-dimensional fabric can be increased by the use of a yarn tensioning device as disclosed in Japanese Laid-Open Patent Application H2-178176 or by the use of a yarn tensioning device as disclosed in Japanese Patent Publication H4-47054. However, a greater orientation angle is reflected by a greater yarn draw-out angle from the yarn tensioning device, so that, when a bobbin is moving away from the center of the fabric being woven, it becomes necessary to draw out the yarn by more than an amount to be consumed by the weaving operation. It follows that, when the bobbin is approaching the center of the fabric, this time there arises a necessity for drawing back the yarn toward the bobbin to take up an excess amount of yarn which would remain overfluously after consumption by a weaving operation. In this regard, as will be explained below, the conventional yarn tensioning devices fail to cope with these problems to a sufficient degree.
Illustrated schematically in FIG. 16 is a typical yarn tensioning device which has been well known in the art.
This yarn tensioning device basically includes a bobbin 3 rotatably mounted on a support shaft 2 which is erected at an eccentric position on a carrier, a clutch 4 mounted on the bobbin 3 and provided with clutch claws, and a rocking lever 5 pivotally supported on the carrier 1 for rocking movements about a fulcrum point 6 in a center portion thereof and engageable at a fore end portion thereof with one of the claws of the clutch 4 to block the rotation of the bobbin 3.
The yarn which is unwound from the bobbin 3 is led out through yarn guides 8, 9 and 10, of which the yarn guides 8 and 10 are fixedly located on the carrier 1 while the yarn guide 9 is provided on a slider member 13 which is slidable along a guide shaft 11 under the influence of the tension in the feed yarn against a biasing force of a tension spring 12. When the tension spring 12 is compresed by a predetermined basing force, the slider member 13 is brought into engagement with a contacting member 14 which is connected to one end of the rocking lever 5, thereby releasing the bobbin 3 from the blocking action of the rocking lever 5 against baising action of a return spring 15.
There
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patent: 5220859 (1993-06-01), DeYoung
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Stodola Daniel P.
Three-D Composites Research Corporation
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