Claims
- 1. A method of producing a yarn or the like, comprising the steps of:
- separating fibers from two fiber strands;
- transferring said separated fibers to two spacedly arranged friction spinning means each having a respective yarn forming location at different transfer rates towards related ones of said yarn forming locations;
- forming a friction spun yarn at said yarn forming locations of said two spacedly arranged friction spinning means;
- during said step of forming said friction spun yarn, drawing-in by suction an air stream through a respective perforated surface into each of said two spacedly arranged friction spinning means and thereby transferring said separated fibers to said perforated surfaces;
- withdrawing said friction spun yarn in a predetermined yarn withdrawal direction;
- during said step of transferring said separated fibers to said two spacedly arranged friction spinning means, transferring said separated fibers of said two fiber strands at least at two fiber delivery locations in a respective predeterminate direction to each of said spacedly arranged friction spinning means; and
- imparting different twist directions to the separated fibers at each respective yarn forming location.
- 2. The method as defined in claim 1, further including the step of:
- rotating the two spacedly arranged friction spinning means in opposite directions of rotation in order to impart said different twist directions to the separated fibers at each respective yarn forming location.
- 3. A method of producing a yarn or the like, comprising the steps of:
- separating fibers from two fiber strands;
- transferring said separated fibers to two spacedly arranged friction spinning means each having a respective yarn forming location;
- twisting said separated fibers in different twisting directions about yarn ends present at said related yarn forming locations and thus forming a friction spun yarn at said yarn forming locations of said two spacedly arranged friction spinning means;
- during said step of forming said friction spun yarn, drawing-in by suction an air stream through a respective perforated surface into each of said two spacedly arranged friction spinning means and thereby transferring said separated fibers to said perforated surfaces;
- withdrawing said friction spun yarn in a predetermined yarn withdrawal direction; and
- during said step of transferring said separated fibers to said two spacedly arranged friction spinning means, transferring said separated fibers of said two fiber strands at least at two fiber delivery locations in a respective predeterminate direction to each of said spacedly arranged friction spinning means.
- 4. The method as defined in claim 3, wherein:
- said separated fibers of said two fiber strands are each transferred at each of said at least two fiber delivery locations in a respective predeterminate direction each having a direction component which is opposite to said predetermined yarn withdrawal direction.
- 5. The method as defined in claim 3, further including the step of:
- rotating the two spacedly arranged friction spinning means in opposite directions of rotation in order to impart said different twisting directions to the separated fibers at each respective yarn forming location.
- 6. The method as defined in claim 3, further including the step of:
- drawing the friction spun yarn over an edge of at least one predeterminate one of said two spacedly arranged friction spinning means in order to influence a selected property of the friction spun yarn.
- 7. An apparatus for producing a yarn or the like, comprising:
- at least two separating means separating fibers from related fiber strands;
- each one of said at least two separating means containing a fiber delivery location for delivering separated fibers;
- at least two spacedly arranged friction spinning means operatively associated with said at least two separating means;
- said at least two spacedly arranged friction spinning means defining at least two predetermined yarn forming locations in order to form a friction spun yarn;
- means for generating at least one air stream for each said at least two spacedly arranged friction spinning means;
- said air stream transferring said separated fibers from said fiber delivery locations to related predetermined locations at said friction spinning means;
- said at least two spacedly arranged friction spinning means transporting said separated fibers from said related predetermined locations to said at least two predetermined yarn forming locations;
- withdrawal means for withdrawing said friction spun yarn in a predetermined yarn withdrawal direction;
- said at least two separating means being arranged such that said fiber delivery locations are series-arranged in spaced relationship from one another and such that said separated fibers are delivered to said at least two spacedly arranged friction spinning means at said related predetermined locations of said at least two spacedly arranged friction spinning means;
- said at least spacedly arranged friction spinning means comprising first friction spinning means and second friction spinning means each constituting a friction spinning drum defining an axis;
- said first friction spinning drum and said second friction spinning drum being arranged in spaced tandem relationship;
- each said friction spinning drum constituting a perforated suction drum containing a suction duct;
- each said suction duct constituting said means for generating said at least one air stream;
- each one of said two friction spinning drums defining a related friction spinning drum section;
- a related one of said fiber delivery locations being provided for each one of said friction spinning drum sections; and
- means for driving said friction spinning drum sections at different rotational speeds.
- 8. An apparatus for producing a yarn or the like, comprising:
- at least two separating means separating fibers from related fiber strands;
- each one of said at least two separating means containing a fiber delivery location for delivering separated fibers;
- at least two spacedly arranged friction spinning means operatively associated with said at least two separating means;
- said at least two spacedly arranged friction spinning means defining at least two predetermined yarn forming locations in order to form a friction spun yarn;
- means for generating at least one air stream for each said at least two spacedly arranged friction spinning means;
- said air stream transferring said separated fibers from said fiber delivery locations to related predetermined locations at said friction spinning means;
- said at least two spacedly arranged friction spinning means transporting said separated fibers from said related predetermined locations to said at least two predetermined yarn forming locations;
- withdrawal means for withdrawing said friction spun yarn in a predetermined yarn withdrawal direction;
- said at least two separating means being arranged such that said fiber delivery locations are series-arranged in spaced relationship from one another and such that said separated fibers are delivered to said at least two spacedly arranged friction spinning means at said related predetermined locations of said at least two spacedly arranged friction spinning means;
- said at least two spacedly arranged friction spinning means comprising first friction spinning means and second friction spinning means each constituting a friction spinning drum defining an axis;
- said first friction spinning drum and said second friction spinning drum being arranged in spaced tandem relationship;
- each said friction spinning drum constituting a perforated suction drum containing a suction duct;
- each said suction duct constituting said means for generating said at least one air stream;
- each one of said two friction spinning drums defining a related friction spinning drum section;
- a related one of said fiber delivery locations being provided for each one of said friction spinning drum sections; and
- means for driving said friction spinning drum sections in a mutually offset relationship.
- 9. The apparatus as defined in claim 8, further including:
- a yarn guide element; and
- said yarn guide element being arranged between said friction spinning drum sections.
- 10. An apparatus for producing a yarn or the like, comprising:
- at least two separating means separating fibers from related fiber strands;
- each one of said at least two separating means containing a fiber delivery location for delivering separated fibers;
- at least two spacedly arranged friction spinning means operatively associated with said at least two separating means;
- said at least two spacedly arranged friction spinning means defining at least two predetermined yarn forming locations in order to form a friction spun yarn;
- means for generating at least one air stream for each said at least two spacedly arranged friction spinning means;
- said air stream transferring said separated fibers from said fiber delivery locations to related predetermined locations at said friction spinning means;
- said at least two spacedly arranged friction spinning means transporting said separated fibers from said related predetermined locations to said at least two predetermined yarn forming locations;
- withdrawal means for withdrawing said friction spun yarn in a predetermined yarn withdrawal direction;
- said at least two separating means being arranged such that said fiber delivery locations are series-arranged in spaced relationship from one another and such that said separated fibers are delivered to s said at least two spacedly arranged friction spinning means at said related predetermined locations of said at least two spacedly arranged friction spinning means;
- said at least two spacedly arranged friction spinning means comprising first friction spinning means and second friction spinning means each constituting a friction spinning drum defining an axis;
- said first friction spinning drum and said second friction spinning drum being arranged in spaced tandem relationship;
- each said friction spinning drum constituting a perforated suction drum containing a suction duct;
- each said suction duct constituting said means for generating said at least one air stream;
- each one of said two friction spinning drums defining a related friction spinning drum section;
- a related one of said fiber delivery locations being provided for each one of said friction spinning drum sections; and
- means for driving said spinning drum sections in opposite directions of rotation.
- 11. An apparatus for producing a yarn or the like, comprising:
- at least two separating means for separating fibers from related fiber strands;
- said at least two separating means containing at least two separate fiber delivery locations for separately and independently delivering separated fibers;
- at least two spaced friction spinning means operatively associated with said at least two separating means and each having a perforated surface;
- said at least two spaced friction spinning means defining respective predetermined yarn forming locations in order to form a friction spun yarn;
- withdrawal means for withdrawing said friction spun yarn in a predetermined yarn withdrawal direction;
- means for generating at least one air stream for said at least two spaced friction spinning means;
- said at least one air stream transferring said separated fibers through said at least two separate fiber delivery locations to at least two associated fiber take-up positions on said perforated surfaces of said at least two spaced friction spinning means;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations at predetermined fiber dispositions each of which is associated with one of said at least two fiber take-up positions and inclined relative to said predetermined yarn withdrawal direction;
- said at least two separate fiber delivery locations being series-arranged with respect to said predetermined yarn withdrawal direction;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations at predetermined dispositions each of which is associated with one of said at least two fiber take-up positions and in each of which said separated fibers assume a substantially straightened disposition at a predetermined angle of rearward inclination as viewed in said predetermined yarn withdrawal direction;
- said at least two spaced friction spinning means comprising first friction spinning means and second friction spinning means each including at least one friction spinning drum arranged in axially spaced relationship with respect to each other;
- a related one of said fiber delivery locations being provided for each one of said spaced friction spinning drums; and
- means for driving said friction spinning drums at different rotational speeds.
- 12. An apparatus for producing a yarn or the like, comprising:
- at least two separating means for separating fibers from related fiber strands;
- said at least two separating means containing at least two separate fiber delivery locations for separately and independently delivering separated fibers;
- at least two spaced friction spinning means operatively associated with said at least two separating means and each having a perforated surface;
- said at least two spaced friction spinning means defining respective predetermined yarn forming locations in order to form a friction spun yarn;
- withdrawal means for withdrawing said friction spun yarn in a predetermined yarn withdrawal direction;
- means for generating at least one air stream for said at least two spaced friction spinning means;
- said at least one air stream transferring said separated fibers through said at least two separate fiber delivery locations to at least two associated fiber take-up positions on said perforated surfaces of said at least two spaced friction spinning means;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations at predetermined fiber dispositions each of which is associated with one of said at least two fiber take-up positions and inclined relative to said predetermined yarn withdrawal direction;
- said at least two separate fiber delivery locations being series-arranged with respect to said predetermined yarn withdrawal direction;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations at predetermined dispositions each of which is associated with one of said at least two fiber take-up positions and in each of which said separated fibers assume a substantially straightened disposition at a predetermined angle of rearward inclination as viewed in said predetermined yarn withdrawal direction;
- said at least two spaced friction spinning means comprising first friction spinning means and second friction spinning means each including at least one friction spinning drum arranged in axially spaced relationship with respect to each other;
- a related one of said fiber delivery locations being provided for each one of said spaced friction spinning drums; and
- means for driving said friction spinning drums in opposite directions of rotation.
- 13. An apparatus for producing a yarn or the like, comprising:
- at least two separating means for separating fibers from related fiber strands;
- said at least two separating means continuing at least two separate fiber delivery locations for separately and independently delivering separated fibers;
- at least two spaced friction spinning means operatively associated with said at least two separating means and each having a perforated surface;
- said at least two spaced friction spinning means defining respective predetermined yarn forming locations in order to form a friction spun yarn;
- withdrawal means for withdrawing said friction spun yarn in a predetermined yarn withdrawal direction;
- means for generating at least one air stream for said at least two spaced friction spinning means;
- said at least one air stream transferring said separated fibers through said at least two separate fiber delivery locations to at least two associated fiber take-up positions on said perforated surfaces of said at least two spaced friction spinning means;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations at predetermined fiber dispositions each of which is associated with one of said at least two fiber take-up positions and inclined relative to said predetermined yarn withdrawal direction;
- said at least two separate fiber delivery locations being series-arranged with respect to said predetermined yarn withdrawal direction;
- said at least two spaced friction spinning means transporting said separated fibers from said at least two fiber take-up positions to said respective predetermined yarn forming locations at predetermined dispositions each of which is associated with one of said at least two fiber take-up positions and in each of which said separated fibers assume a substantially straightened disposition at a predetermined angle of rearward inclination as viewed in said predetermined yarn withdrawal direction;
- said at least two spaced friction spinning means comprising first friction spinning means and second friction spinning means each including at least one friction spinning drum arranged in axially spaced relationship with respect to each other;
- a related one of said fiber delivery locations being provided for each one of said spaced friction spinning drums;
- each of said friction spinning drums being a perforated drum; and
- a respective drum member cooperating with each perforated drum to define respective pairs of drum members arranged in mutually spaced tandem relationship.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 04924/84 |
Oct 1984 |
CHX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS AND PATENTS
This application is a divisional of the commonly assigned, co-pending U.S. application Ser. No. 06/789,902, filed Oct. 10, 1985, and entitled "METHOD OF AND APPARATUS FOR PRODUCING A YARN" now U.S. Pat. No. 4,753,066, granted June 28, 1988, which, in turn, is related to the commonly assigned, U.S. application Ser. No. 06/734,845, filed May 15, 1985, and entitled "METHOD AND APPARATUS FOR PRODUCING A YARN", now U.S. Pat. No. 4,660,371, granted Apr. 28, 1987.
This application is related to the commonly assigned, co-pending U.S. application Ser. No. 07/155,956, filed Feb. 16, 1988, entitled "FRICTION SPUN YARN", now abandoned, application Ser. No. 07/167,029, filed Mar. 11, 1988, entitled "METHOD OF, AND APPARATUS FOR, PRODUCING A FRICTION SPUN YARN", now U.S. Pat. No. 4,773,209, granted Sept. 27, 1988.
The present invention relates to a new and improved method of, and apparatus for, producing a yarn or the like.
In its more particular aspects, the present invention specifically relates to a new and improved method or producing a yarn or the like in which fibers are separated from a fiber strand and transferred to at least one friction spinning means at which a spun yarn is formed at least at one yarn forming position or location. During the step of forming the spun yarn, an air stream is drawn-in by suction through a perforated surface into the at least one friction spinning means and thereby the fibers are transferred to the perforated surface. The spun yarn thus formed is withdrawn in a predetermined withdrawal direction.
In a yarn spinning apparatus as known, for example, from Swiss Pat. No. 623,362 a device is provided for spinning a yarn according to the open-end friction-spinning principle. In accordance therewith, two perforated friction spinning drums which are maintained at sub-atmospheric pressure, spin a yarn from individualized fibers fed thereto in passages. The fibers are fed in respective passages to each spinning drum and in the direction of movement of the spinning drum, i.e. the fibers are delivered into both converging spaces. This has the disadvantage that the yarn forming position must be necessarily located at the narrowest place between the drums or rollers. As a result, the free space at this narrowest place is subjected to continuous variation due to the continually changing thickness of the yarn end located therein.
A further disadvantage of this apparatus is the necessity to perforate both friction spinning drums and subject both of the friction spinning drums to sub-atmospheric pressure or vacuum conditions in order to guide the fibers which are delivered onto the drums, to the yarn forming position or location in the related converging space.
Furthermore, such apparatus is very expensive and voluminous because of the delivery of fibers from both sides.
Therefore, with the foregoing in mind, it is a primary object of the present invention to provide a new and improved method of, and apparatus for, producing a yarn or the like and by means of which more than one fiber can be supplied per yarn formation in the simpleast possible manner.
Now in order to implement this and still further objects of the invention, which will become more readily apparent as the description proceeds, the yarn producing method of the present development is manifested by the features that, during the step of transferring the separated fibers to the at least one friction spinning means, the separated fibers are transferred at least at two fiber delivery locations in one predetermined or predeterminate direction to the friction spinning means.
According to more specific aspects of the invention, the method of producing a yarn or the like, comprises the steps of separating fibers from two fiber strands, wherein the separated fibers are transferred to two spacedly arranged friction spinning means each having a respective yarn forming location. The separated fibers may be transferred at different transfer rates to or towards related ones of the yarn forming locations. There is formed a friction spun yarn at the yarn forming locations of the two spacedly arranged friction spinning means.
The method may also be practiced such that the separated fibers are twisted in different twisting directions about yarn ends present at the related yarn forming location to thus form the friction spun yarn.
During the formation of the friction spun yarn, there is drawn in by suction an air stream through a respective perforated surface into each of the two spacedly arranged friction spinning means in order to thereby transfer the separated fibers to the perforated surfaces. The friction spun yarn is withdrawn in a predetermined yarn withdrawal direction, and during the step of transferring the separated fibers to the two spacedly arranged friction spinning means, there are transferred the separated fibers of the two fiber strands at least at two fiber delivery locations in a respective predetermined or predeterminate direction to each of the spacedly arranged friction spinning means.
As alluded to above, the invention is not only concerned with the aforementioned method aspects, but also relates to an improved construction of a yarn producing apparatus. Such apparatus, in its more specific aspects, contains at least two fiber separating means each of which contains a fiber delivery location for delivering fibers. There are further provided first friction spinning means and second friction spinning means which cooperate at a predetermined yarn forming location in order to form a spun yarn. Means are provided for generating an air stream which transfers the fibers from the fiber delivery location to a predetermined location at the first friction spinning means and at the second friction spinning means. The first friction spinning means and the second friction spinning means transport the fibers to the predetermined yarn forming location. Withdrawal means are provided for withdrawing the spun yarn in a predetermined yarn withdrawal direction.
According to the invention, the at lest two fiber separating means are arranged such that the fiber delivery locations are series-arranged with respect to the predetermined yarn withdrawal direction and that the fibers are delivered to the first friction spinning means at the predetermined location thereof.
In accordance with a particular construction of the apparatus for producing a yarn or the like the first friction spinning means and the second friction spinning means each constitute a friction spinning drum defining an axis. The first friction spinning drum and the second friction spinning drum are arranged with substantially parallel axes and in a nearly contacting relationship. The first friction spinning drum constitutes a perforated suction drum defining the perforated surface and containing a suction duct. The suction duct constitutes means for generating the air stream. Each one of the two friction spinning drums is sub-divided and forms related friction spinning drum sections. The friction spinning drum sections define pairs of cooperating friction spinning drum sections, and a related one of the fiber delivery locations are provided for each one of the pairs of the cooperating friction spinning drum sections.
It is one important advantage of the inventive method and apparatus that even for producing coarse yarns, e.g. of a count smaller than Ne 16, separation of the fiber sliver or strand which is fed to the separating or opening device or means, can be effected and enables individualization of the fibers prior to their deposition on the friction spinning device or means in a manner which is advantageous for the spinning process.
It is a further significant advantage of the inventive method and apparatus that, due to the series-arrangement of the fiber take-up positions as viewed from the yarn end, there exists the possibility of producing a friction spun yarn in which, for example, fibers of shorter staple length are located in the interior and fibers of greater staple length are located at the periphery of the yarn. In such a yarn, the fibers of greater staple length may also have a larger angle of inclination than the fibers of shorter staple length or vice versa. Furthermore, synthetic fibers can be located in the interior and natural fibers at the periphery of such friction spun yarn. Also, effect yarns can be produced in this manner.
US Referenced Citations (11)
Foreign Referenced Citations (4)
| Number |
Date |
Country |
| 3330412 |
Mar 1985 |
DEX |
| 3330413 |
Mar 1985 |
DEX |
| 2345541 |
Oct 1977 |
FRX |
| 623362 |
May 1981 |
CHX |
Divisions (1)
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Number |
Date |
Country |
| Parent |
789902 |
Oct 1985 |
|
Patent Grant
4854118
