Claims
- 1. An alternate twisted yarn manufacturing method for twisting yarn, comprising:providing the yarn and a pulley having a shaft and pulley flanges; alternately repeating the operations in which the yarn is inserted in a yarn passage formed between the pulley flanges so that a flexure state is obtained, the shaft of the pulley being inclined in relation to the yarn passage plane to bring the yarn into contact with an inside portion of at least one of the flanges of the pulley as the yarn travels through the pulley, thereby generating twist in an opposite direction in the yarn entering the pulley as compared to the yarn exiting the pulley, and moving the pulley shaft to perpendicular in relation to a yarn passage plane so as to eliminate contact between the yarn and the inside flange portions of the pulley, so that the yarn passage is in neutral position, wherein the yarn is not twisted by the pulley.
- 2. The alternate twisted yarn manufacturing method described in claim 1, including providing pulleys comprised of several front stage pulleys arranged in parallel along with one rear stage pulley; the yarn passage of several yarns travelling in parallel and being inserted between the pulley flanges of several of said front stage pulleys, one yarn end per front stage pulley, so that the yarn passage is bent or flexed; these yarn ends then being assembled and passed through an eyelet and then inserted between the flanges of the one rear stage pulley with the yarn passage bent or flexed, while a tilting motion is given to the shafts of each front stage pulley and the shaft of the rear stage pulley by a computer controller, which controls the tilting to produce a variety of alternate twisted yarns.
- 3. The alternate twisted yarn manufacturing method defined in claim 2 in which the front stage pulleys or the rear stage pulley or both the front stage pulleys and the rear stage pulleys are replaced by a twist spindle that is positively driven such that the yarn ends are passed through the front stage twist spindles, one yarn end per front stage spindle; these yarn ends then being assembled and passed through an eyelet and then passed through the rear stage twist spindle; the twisting action of the twist spindles being regulated by a computer controller which can be selectively programmed in order to produce a variety of alternate twisted yarns.
- 4. The alternate twisted yarn manufacturing method described in claim 2 which is characterized in that the direction for inclining the pulley shaft in relation to the yarn passage plane is alternately inclined in the opposite direction to the neutral position.
- 5. The alternate twisted yarn manufacturing method described in claim 2 which is characterized in that the pulley is of a dual construction, composed of an internal roller for forming an inside grooved base of the pulley and an external pulley for forming flanges of the pulley; the internal roller rotating freely while the rotation speed as well as the direction of the external pulley is controlled in the forward and reverse rotation directions.
- 6. The alternate twisted yarn manufacturing method described in claim 1 which is characterized in that the direction for inclining the pulley shaft in relation to the yarn passage plane is alternately inclined in the opposite direction to the neutral position.
- 7. The alternate twisted yarn manufacturing method described in claim 6 which is characterized in that the pulley is of a dual construction, composed of an internal roller for forming an inside grooved base of the pulley and an external pulley for forming flanges of the pulley; the internal roller rotating freely while the rotation speed as well as the direction of the external pulley is controlled in the forward and reverse rotation directions.
- 8. The alternate twisted yarn manufacturing method described in claim 1 which is characterized in that the pulley is of a dual construction, composed of an internal roller for forming an inside grooved base of the pulley and an external pulley for forming the two flanges of the pulley; the internal roller rotating freely while the rotation speed and the direction of the external pulley is controlled in the forward and reverse rotation directions.
- 9. An alternate twisted yarn manufacturing device comprising:a pulley having pulley flanges defining a yarn passage; said pulley being freely rotatable in a plane carrying the yarn passage and said pulley being configured to be driven by movement of the yarn in the yarn passage, the yarn being inserted between the pulley flanges with the yarn passage flexed at an angle; a pulley shaft connected to said pulley; and a neutral and tilt switching means for changing said pulley shaft to a state perpendicular to the yarn passage plane and to a tilted twisting state, for imparting alternating twist in the yarn.
- 10. The alternate twisted yarn manufacturing device described in claim 9 which is characterized in that the pulley is of a dual construction composed of an internal roller for forming a grooved base of the pulley and an external pulley for forming the two flanges of the pulley, so that the internal roller rotates freely, and an external pulley controllable in the forward and reverse rotation directions, and including an air nozzle assembly having air nozzles, the rotation speed of said external pulley being controllable by said air nozzle assembly in which the air nozzles control the rotation direction of the external pulley and the air pressure from the air nozzle assembly controls the rotational speed of the external pulley.
- 11. The alternate twisted yarn manufacturing equipment described in claim 10 characterized in that the pulley flange's internal surface is made rough.
- 12. The alternate twisted yarn manufacturing equipment described in claim 9 characterized in that the pulley flange's internal surface is made rough.
- 13. The alternate twisted yarn manufacturing equipment described in claim 9 characterized in that the contour profile on the pulley flange's outer circumference surface is polygonal.
- 14. The alternate twisted yarn manufacturing equipment described in claim 9 characterized in that the contour profile on the pulley flange's outer circumference surface is made oval.
- 15. The alternate twisted yarn manufacturing equipment described in claim 9 characterized in that the contour profile on the pulley flange's outer circumference surface is made dissimilar.
- 16. The alternate twisted yarn manufacturing device described in claim 9 which is characterized in that the pulley is of a dual construction composed of an internal roller for forming a grooved base of the pulley and an external pulley for forming flanges of the pulley, so that the internal roller rotates freely, and an external pulley controllable in the forward and reverse rotation directions, and including a motor and the rotation speed of said external pulley being controllable by said motor.
Priority Claims (3)
Number |
Date |
Country |
Kind |
9-362264 |
Dec 1997 |
JP |
|
10-27397 |
Feb 1998 |
JP |
|
10-215991 |
Jul 1998 |
JP |
|
Parent Case Info
This application is a continuation-in-part of Ser. No. 09/205,893 filed Dec. 4, 1998.
US Referenced Citations (25)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0 022 421 |
Jan 1981 |
EP |
1 283 332 |
Jun 1962 |
FR |
2 344 656 |
Oct 1977 |
FR |
1139445 |
Apr 1966 |
GB |
07066824 |
Feb 1995 |
JP |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09/205893 |
Dec 1998 |
US |
Child |
09/246822 |
|
US |