CN1894450A - Machine for yarn cabling/twisting and continuous setting - Google Patents

Abstract

The invention relates to a machine, comprising several processing stations which integrate the following means in a combined and successive manner, according to the same work position: - means for twisting/cabling (1) a yarn, - thermosetting means, composed of a rotating heating godet (2), followed by an accumulator (3) capable of cooling and relaxing the yarn in a totally free state, without tension, and - means for winding (4) the yarn (5), said means being secured to yarn guiding and driving bodies.

Description

Machines for yarn cascading/twisting and continuous setting

technical field

The invention relates to the technical part of yarn setting, twisting and crimping in the textile field.

Background technique

Many technical solutions have been proposed for implementing cascading and setting continuous yarn operations. Reference is made, by way of a completely non-limiting example, to the patent FR2732043, which concerns a machine comprising a central frame supporting a plurality of identical working positions, each comprising:

- double-twisting or direct-twisting spindles supporting yarn packages for twisting or co-twisting with a second yarn;

- yarn advancing devices for eliminating tension due to twisting or cabling operations,

- Yarn heating device with cooling zone afterwards;

- a device for winding up the treated yarn;

- heating installations consisting of linear ovens placed vertically or approximately vertically;

- the advance and return movement of the yarn inside said oven, being introduced into and withdrawn from it through its bottom, the feed and return system for said yarn being provided at the top; and

- Means for keeping the yarn under minimum tension during the cooling phase and transferring the yarn to the take-up device.

A solution has been proposed in which the oven with larger dimensions is omitted and replaced by a cylindrical guide roller connected to the return yarn guide, which allows the reeving of yarn. The guide rollers are heated to a defined temperature and actively driven to rotate. This solution comes from eg the teaching of patent application FR02/01357 (not yet published).

Based on this prior art, the problem to be solved by the present invention is to shape one yarn at a time successively so as to have a very short yarn path with few contact points and thus obtain a yarn with a more uniform twist.

Contents of the invention

In order to solve the above-mentioned problems, a machine for continuous cabling/twisting and setting of yarns has been designed and developed, which comprises a number of processing stations comprising in a joint and sequential manner at the same working position:

- devices for twisting/cabbing yarns;

- a heat-setting device consisting of a heated rotating guide roller followed by an accumulator capable of relaxing and cooling the yarn in a completely free and tension-free state; and

- means for winding or reeling the yarn, said means being acted upon by means for driving and guiding the yarn.

Combining the three operations of cabling/twisting, heat setting and winding can significantly reduce the management of the material being processed between the three operations. This greatly saves the labor required for managing in-process inventory and movement of materials, and also shortens the production cycle.

In order to solve the problem of having the shortest possible yarn path, at a particular or each processing station, the twisting/cascading, heat-setting and winding devices are combined with the devices for advancing the yarn And the arrangement of the frame of said machine is jointly mounted so as to define a small and compact space along the short yarn path, which space contains the yarn unwinding device.

The guide rollers have a configuration capable of allowing controllable shrinkage of the yarn.

In one embodiment, to address the problem of controlling the shrinkage of the yarn, the guide roll has a longitudinal profile that defines sequential zones throughout almost the entire length of the guide roll, namely, the initial crimp pick-up zone, the residual shrinkage zone and the set zone .

The initial crimp pick-up zone and residual shrinkage zone are formed by conical bearing surfaces, while the shape-setting zone is formed by cylindrical bearing surfaces.

The two conical bearing surfaces have different cone angles, the residual shrinkage zone having a smaller cone angle than the initial crimp pick-up zone.

Advantageously, the length of the shaping zone is greater than the sum of the lengths of the other two zones.

The initial crimp pick-up zone, residual shrinkage zone and setting zone may consist of curved profiles.

Another problem addressed by the invention is to keep the yarn in contact with said guide rollers for a period of time in order to set the yarn. To this end, the heated guide rolls are subjected to a device that allows automatic winding of the yarn.

Another problem that the present invention aims to solve is to ensure that the yarn is completely cooled and relaxed after heat setting so that a buffer zone is created between heat setting and winding so that heat setting continues continuously during take-up bobbin changes .

In order to solve this problem, the accumulator consists of a straight hollow body whose end as output side is frusto-conical in order to form a buffer zone inside said body which prevents the yarn from leaving directly. to move the output of the yarn.

At the outlet of the reservoir, the yarn is subjected to the action of a rod capable of decrimping the yarn and imparting the tension required for its winding.

In another embodiment, the accumulator consists of a slack belt in which the yarn forms a reserve, said belt being arranged between heat-setting guide rolls and a take-up device, the take-up speed being adjusted so that the yarn stored in the reserve The amount of yarn is maintained between two predetermined values, namely a minimum value and a maximum value.

The yarn is stored in the reservoir by the effect of relative movement between the guide element and the reservoir itself.

The relative movement is produced by displacement of the yarn guiding element or of the reservoir itself.

In a preferred embodiment of the invention, each processing station comprises, sequentially from the unwinding bobbin:

- Yarn twisting and/or cabling spindles;

- a pressing/conveying member that limits the tension of the yarn and sets the downstream twist level;

- heated rotating guide rollers;

- cooling storage;

- Decurl sticks; and

- Winding or coiling bobbins.

Description of drawings

The invention will be described in more detail with the aid of the accompanying drawings, in which:

- Figure 1 is a schematic diagram showing the principle of how yarns are processed in one and the same working position, which combines twisting/cascading, heat-setting and winding operations;

- Figure 2 is a perspective view of an illustrative example of a machine according to the invention;

- Figure 3 is a schematic diagram showing an illustrative example of a heating guide roller;

- Figure 4 is a perspective view of the reservoir; and

- Figure 5 is a longitudinal sectional view of the reservoir.

Detailed ways

As shown in particular in FIG. 2 , the machine comprises a frame B preferably with a plurality of identical processing stations. According to the invention, each treatment station comprises in one and the same working position in a combined and sequential manner: a device 1 for twisting/cabbing the yarn, a device 2 for heat-setting the yarn, a device for cooling the yarn A device 3 for the thread and a device 4 for winding or reeling the yarn 5.

According to an important feature of the invention, within each processing station, the twisting/cascading device 1 , the heat setting device 2 and the cooling device 3 as well as the device 4 for winding or winding the yarn 5 together with the frame of the machine The arrangement of B is jointly mounted so as to define a small and compact space containing the yarn winding device 6 along the short length of the yarn path ( FIG. 1 ).

The yarn twisting/cabbing device consists of two-for-one twisting spindles for carrying out twisting or direct cabling operations in a manner well known to those skilled in the art. For example, a spindle driven by any suitable known device receives a first yarn bobbin called a "can" to be processed. In order to implement the direct cabling operation, the spindle has a hollow shaft for feeding the second yarn, called “creel yarn”, from the unwinding bobbin 6 . The creel yarn is fed through the hollow shaft of the spindle to be combined with the cans in the doubling head 7 . The doubling head can be combined with an advancing device, which is used to eliminate the tension generated by doubling or twisting. The advancing means may consist of an assembly comprising a capstan and pressure rollers. Since such means are well known to those skilled in the art, they will not be described in detail. For example the reader finds relevant teachings in patent application FR2732043.

The yarn heat setting device consists of a rotating heated guide roller 2 followed by an accumulator 3 capable of cooling and relaxing the yarn so that it is completely relaxed and tension-free. The guide roller 2 is heated to a defined temperature and is actively driven in rotation by any suitable known means. For example, the heating means may be of the induction type.

Importantly, the guide roller 2 has a configuration capable of allowing controlled shrinkage of the yarn. As shown in particular in FIG. 3 , the guide roller has a longitudinal profile so as to define successive successive zones throughout its entire length. These zones consist of a coiling zone 2a, a residual shrinkage zone 2b, and a setting zone 2c.

For example, the two zones 2a and 2b are formed by conical bearing surfaces, while the shaping zone 2c is formed by cylindrical bearing surfaces. The conical bearing surfaces 2a and 2b have different angles. Therefore, the taper angle α of the residual shrinkage zone 2b is smaller than the taper angle β of the initial crimp pick-up zone 2a.

Figure 3 also shows that the length of the residual shrinkage zone 2b is greater than the length of the take-up zone 2a. Likewise, the length of the shaping zone 2c is greater than the sum of the lengths of the other two zones 2a and 2b. Thus, the illustrated example shows three zones 2a, 2b and 2c formed by a succession of bearing surfaces of different lengths and cone angles.

Of course, other structures may be envisaged which produce the same function with the same result, without departing from the scope of protection of the present invention. For example, the guide roller 2 may have a curved longitudinal profile.

Due to the characteristics of the heated guide roller 2 it is possible to shape the twisted or co-twisted yarn in order to impart very good crimp properties to the yarn.

In the initial crimp pick-up zone 2a, the yarn comes into contact with the heated guide rollers creating a shock effect which allows the yarn to adopt its initial crimp. This crimping is accompanied by a controlled shrinkage caused by the cone angle β of the conical bearing surface 2a. After the yarn is endowed with this shock effect, the residual shrinkage zone 2b allows the yarn to complete its shrinkage gradually and evenly, provided that the cone angle of the conical bearing surface 2b is smaller than that of the conical bearing surface 2b. 2a long.

In the cylindrical zone 2c the yarn is set under the conditions to which it was subjected in the previous two zones. Due to the great length of the cylindrical support surface 2c, the setting of the yarn takes place gradually.

Due to this arrangement in the two conical zones, the yarn maintains its initial tension but shrinks. As the tension in the yarn is gradually increased, the yarn has a tendency to spin on itself. Thereafter, all parts of the yarn come into contact with guide rollers, which ensure a complete round shape of the yarn. The conical profile and weaving control mean that the yarn must have a planned shrinkage.

It can be found that in order to set the yarn, the yarn must be in contact with different areas of the guide roll 2 for a period of time. In order to increase this contact time, it is known to carry out the yarn winding operation on guide rollers. This winding operation can be carried out manually or automatically.

After leaving the heated guide roller assembly 2, the yarn is subjected to the action of the accumulator 3, which is able to completely cool and relax the yarn after heat setting, and is able to create a buffer zone between heat setting and winding, so that the Heat-setting continues continuously during bobbin 4 exchange.

As shown in particular in FIGS. 4 and 5 , the reservoir 3 is constituted by a hollow linear body, for example of quadrangular section. The end of the main body of the accumulator 3 as output side is frusto-conical in cross-section tapering towards the free end, so as to form a buffer zone inside the main body which brakes the yarn output by preventing the yarn from leaving directly.

As shown in particular in Figures 1 and 2, in said processing station, this reservoir 3 after the heated rollers is located in an approximately vertical plane, the yarn enters the end 3b, after which by simple gravity in the frusto-conical Leave at 3a. At this frustoconical end 3a, the reservoir 3 has a series of parallel rods 8 mounted on support elements 9 fixed to the end of the reservoir 3, for example. The rod 8 is arranged approximately perpendicular to the longitudinal axis of the reservoir 3, ie perpendicular to the yarn path, in order to perform said decrimping function on said yarn, imparting the tension required for yarn winding.

Other embodiments of the storage 3 are also conceivable. For example, it may consist of a slack band in which the yarn forms a reserve. The belt is provided between heat-setting roll 2 and take-up device 4 . The take-up speed is adjusted such that the stored amount of yarn is maintained between two predetermined values, namely a minimum value and a maximum value.

It should be noted that, regardless of the embodiment, the storage of the yarn 5 in the reservoir 3 results from a relative movement between the guide element and the reservoir 3 . The movement may be an alternating movement of the reciprocating type, or a continuous or alternating rotational movement. Optionally, this relative movement is produced by displacement of the guide element or of the reservoir itself.

From the features forming the basis of the invention, it is evident that each processing station comprises in a joint and sequential manner, starting from the unwinding bobbin 6 along the short length of the yarn path in one and the same working position defining a small compact space:

- Yarn twisting or two-for-one twisting spindle 1, the pressing/transferring member 7 limits the tension of the yarn 5 and sets the downstream tension level;

- heated rotating roller 2;

- cooling storage 3;

- Decurl stick 8; and

- Take-up bobbin 4.

It is very clear that these various devices can be installed in conjunction with any in-line quality control system, buffer storage downstream of the spindle, yarn crimping system, yarn breakage detection system, etc.

These advantages are clear from the above description, in particular the following should be emphasized and repeated:

- Continuous shaping of individual yarns each time along a short path overcomes: waste problems associated with differences in bobbin quality when various bobbins are processed together;

- Possibility of yarn treatment grades with high twist;

- Gained productivity gains;

- process flexibility;

- controlled shrinkage of the yarn due to the profile of the heated guide rollers;

- the use of reservoirs for relaxing and cooling the yarn in a completely free, tension-free state;

- the short path of the yarn with contact points results in a more even tension in the yarn;

- The minimum distance between the transfer member and the heated guide rolls allows for better twist control of the yarn before it is set, avoiding short-term changes in twist; and

- The combination of the three operations of cabling/twisting, heat setting and winding allows a significant reduction in the management of the material being processed.

Claims (16)

1. be used for yarn continuously and the machine of sth.s made by twisting/twisting and setting, described machine comprises a plurality of processing stations, described processing station comprises to unite with mode successively in identical operating position:

-be used to twist/and the device (1) of twisted yarn;

-by the thermosetting device that the heating rotation deflector roll (2) that holder (3) is arranged thereafter constitutes, described holder can relax and cooling yarn under freedom and the tension-free state fully; With

-being used for reeling or batching the device (4) of yarn (5), described device is subjected to being used to driving and guiding the effect of the device of yarn.

2. machine as claimed in claim 1, it is characterized in that: specific or each processing station at certain, twisting/and twist device (1), thermosetting device (2) and coiler device (4) and being used to make the layout of the frame of device that yarn advances and described machine unite installation, so that the thread path along short length defines little and compact space, described space comprises yarns take-off device (6).

3. machine as claimed in claim 1 or 2 is characterized in that: deflector roll (2) has the structure that can allow yarn controllably to shrink.

4. machine as claimed in claim 3, it is characterized in that: the described structure of described deflector roll is made of vertical profile, described vertical contour limit almost spreads all over the zone successively of the whole length of described deflector roll, that is, initial crimp pick-up area (2a), residual contraction remainder district (2b) and setting zone (2c).

5. machine as claimed in claim 4 is characterized in that: initial crimp pick-up area (2a) and residual shrinking zone (2b) are made of conical bearing-surface, and setting zone (2c) is made of cylindrical bearing surface.

6. machine as claimed in claim 5 is characterized in that: two conical bearing-surfaces (2a) and (2b) have different cone angle, the cone angle of residual shrinking zone (2b) is littler than initial crimp pick-up area (2a).

7. machine as claimed in claim 3 is characterized in that: the length of setting zone (2c) is greater than other two districts (2a) and length sum (2b).

8. machine as claimed in claim 4 is characterized in that: initial crimp district, residual shrinking zone and setting zone are made of crooked outline.

9. machine as claimed in claim 2 is characterized in that: heating deflector roll (2) is subjected to allowing the yarn effect of the device of winding automatically.

10. machine as claimed in claim 2, it is characterized in that: holder (3) is made of the straight hollow body of approximate vertical setting, the end as outlet side of main body is a frusto-conical, so that form buffering area in described main body, this buffering area directly leaves the output of braking described yarn by preventing yarn.

11. machine as claimed in claim 10 is characterized in that: the exit in holder (3), yarn are subjected to the effect of rod (8), and described rod can the decurl yarn and given reel for yarn around needed tension force.

12. machine as claimed in claim 3, it is characterized in that: holder (3) is made of lax band, yarn forms deposit in lax band, described band is located between heat setting deflector roll (2) and the batching apparatus (4), regulate winding speed, stored amount of thread maintains between two predetermined values in the feasible deposit, that is, and and between minimum of a value and the maximum.

13. as claim 7 or 8 described machines, it is characterized in that: yarn (5) is stored in the holder by relative motion effect between induction element and the holder (3) self.

14. machine as claimed in claim 13 is characterized in that: described relative motion produces by the displacement of yarn induction element.

15. machine as claimed in claim 13 is characterized in that: described relative motion produces by the displacement of holder self.

16. as each described machine among the claim 11-15, it is characterized in that: each is handled station and comprises successively from the unwinding bobbin:

-yarn twisting and/or and twist spindles (1);

Pressurization/the transmission member (7) of the tension force of-restriction yarn and setting downstream level of twist;

-heating rotation deflector roll (2);

-cooling holder (3);

-decurl rod (8); With

-reel or batch bobbin (4).

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