JPH0446873B2 - - Google Patents

Description

- A splicing device for mechanically untwisting and retwisting yarn, characterized in that it has a discharge means 29 for discharging excess yarn ends.

2. The untwisting-retwisting means 12 consists of two pairs of belts 112 arranged substantially transverse to the direction of the yarns 20-21 to be spliced, each pair of belts supporting the two yarns 20-21. 21, each pair of belts consists of two substantially flat portions 16 in which the threads 20-21 are located, the flat portions 16 facing each other and facing the belt. Device according to claim 1, characterized in that during operation of 112 it is possible to travel in mutually opposite directions.

3. The means 19 for laterally displacing at least one of the yarns 20-21 to be spliced includes a hook means 22 arranged to run in a direction substantially transverse to the yarns 20-21; and a means for laterally displacing the fixing and tearing means 18 that engages the same thread as the engaged thread, and the means 19 for laterally displacing at least one of the threads, after untwisting the thread itself. Claim 1 characterized in that 20-21 can be aligned and aligned.
The device according to paragraph 2 or paragraph 2.

4. The belt 112 is stretched over a pulley 14, and a sliding surface capable of resisting bending of the flat portion 16 of the belt 112 is disposed within the belt.
The device according to any one of items 3 to 3.

5. Device according to claim 1, characterized in that the untwisting-retwisting means is a cylinder 212 provided with a groove that engages the yarns 20-21 at least temporarily.

6. The apparatus according to any one of claims 1 to 5, wherein the re-twisting means 24 is a re-twisting belt 124.

7 The re-twisting means 24 is a disk-shaped re-twisting means 2
Claim 5 characterized in that: 24
Equipment described in Section.

8. The device according to any one of claims 1 to 7, characterized in that the retwisting means 24 has a flat surface at least in part.

9. The device according to any one of claims 1 to 7, characterized in that the retwisting means 24 includes processing means 25 at least in part.

10. According to any one of claims 1 to 9, the intermediate tightening means 23 cooperates with at least one edge of the untwisting-retwisting means 12. Device.

11. The device according to any one of claims 1 to 9, characterized in that the intermediate tightening means 23 is arranged at a predetermined position within the untwisting-retwisting means 12. .

12 The fixing and tearing means 18 are at least partially movable and are capable of at least untwisting and untwisting the yarn.
The yarn ends between the retwisting means 12 are subjected to an axial pinching action and a tearing action along with the removal of the excess yarn ends 120-121 and the formation of the remaining yarn ends. begins approximately at the periphery of the intermediate tightening means 23 and ends approximately outside the untwisting-retwisting means 12 . equipment.

13. The apparatus according to any one of claims 1 to 12, characterized in that the processing means 25 provided in the reburning means 24 are arranged in a sector shape.

14. Any one of claims 7 to 12, characterized in that the treatment means 25 provided on the disk-shaped reburning means 224 are arranged in the form of sectors of a ring related to its diameter. The device according to item 1.

15. The processing means 25 of the disc-shaped retwisting means 24 are arranged in substantially diametrically opposed helical sectors. Range 7th
The device according to any one of items 1 to 12.

16. Device according to any one of claims 1 to 15, characterized in that auxiliary means 39 are provided inside the untwisting-retwisting means 12.

17 The untwisting-retwisting means 12
17. A device according to claim 1, wherein the device is arranged to reciprocate longitudinally relative to the device.

18 said untwisting-retwisting means 1 facing oppositely;
2 and the oppositely facing retwisting means 24
Claims 1 to 4, characterized in that it can be opened at an angle in order to make it possible to introduce 0-21 and to draw out the spliced yarn. Section 6, Section 8 to Section 13
16. The device according to any one of Items 16 and 17.

[Detailed description of the invention]

The present invention relates to a yarn splicing device that mechanically untwists and retwists yarn.

The device of the invention can be operated by the method described in part in European Patent Application No. 0039609, published on November 11, 1981.

In the device of the above patent application, the device used for untwisting and retwisting the yarn consists of a pair of rotating discs.

Furthermore, in order to carry out splicing in the device of the above-mentioned patent application, the tracts of the yarn to be joined together are introduced between the open discs and intersect each other along the diameter of these discs. It is arranged in two directions.

These discs are then brought close to each other and activated in the first phase of the operating cycle, rotating in opposite directions to effect untwisting of the yarn ends.

After the excess thread ends to be removed from the thread have been removed and the remaining thread ends have been formed at each end of the thread within the discs, each disc is actuated in a direction opposite to that of the first stage of the operating cycle. Twisted and retwisted.

Due to the disk shape of the device used for untwisting and retwisting the yarn, the two yarn ends formed between the disks will, if the device works optimally, at least in the untwisting phase. Positions must be taken along the diameters of the discs that intersect with each other within said discs.

This gives rise to the problem of interference of the yarn ends at the intersections, as well as the problem of incomplete mutual overlap and interpenetration of the fibers of the remaining yarn ends. These disadvantages have an unfavorable effect on the quality of the splicing performed by the device of the above-mentioned patent application.

The object of the present invention is to provide a splicing device that performs mechanical untwisting and retwisting, thereby overcoming the aforementioned technical deficiencies and providing spliced parts of excellent quality.

One advantage of the device of the invention is that the untwisting takes place in a position where the yarns do not interfere with each other.

Another advantage of the device according to the invention is that, depending on the type of yarn to be spliced, the length of the splicing section can be varied to suit the fiber length.

The terms "untwisting" and "retwisting" herein refer to the operations of removing the twist contained in the yarn and reforming the twist, respectively.

Therefore, in the main text below, untwisting refers to untwisting enough to achieve a twist in the opposite direction so that the twist value reaches zero or 100% or more of the twist value before untwisting. means operation.

On the other hand, re-twisting means an operation of twisting the spliced portion so that the twist value is the same as, almost the same as, or even larger than the original twist value before untwisting.

According to one aspect of the invention, the untwisting and retwisting operations of the two yarns are performed by an untwisting-retwisting means.

According to the invention, this untwisting-retwisting means consists of opposing belts or pads facing each other and movable in opposite directions, between which the yarn is brought into engagement. Alternatively, the untwisting and reburning means may consist of rotating means such as cylinders or discs provided with grooves in which the yarn is at least temporarily engaged, rotating gripping means or equivalent mechanical means.

According to another aspect of the invention, the device of the invention comprises:
Intermediate tightening means are included to conveniently determine the point at which the untwisted yarn end of the yarn is tightened so that the fiber length of the remaining yarn end does not protrude from the device itself.

This tightening point is therefore spaced from the untwisting-retwisting means with respect to the length of the fibers themselves so that the fibers of the remaining yarn ends do not protrude from the device itself.

According to yet another aspect of the invention, the device layer of the invention includes means for grasping and tearing off excess yarn ends, and desirably also includes means for discharging this yarn end. .

The picking and tearing operations of the excess yarn end ensure that the yarn is tightened by the intermediate tightening means and the untwisting-retwisting means applies a small pressure on the yarn to assist in the picking action of the fibers. It is advantageous to carry out the process without exerting any or very little pressure.

Because of the picking and tearing action that is carried out in such a way as to leave virtually the entire length of the fibers within the device, the fibers at each remaining end of each yarn are frayed into a tapered shape, which Helps bond and co-operate with yarn fibers.

The splicing is then completed by retwisting the two aligned yarns. According to a further aspect of the invention, this is carried out by retwisting means preferably cooperating with the untwisting-retwisting means during the retwisting stage.

This retwisting means is arranged between the untwisting and retwisting means. This retwisting means can be belt-like, disc-like or plate-like, or in other shapes;
Each has a surface capable of cooperating with the surface of the facing retwisting means.

If the retwisting means is disk-shaped, the retwisting means may be flat in shape or have contoured sections of various configurations, as will be discussed in more detail below.

If the re-twisting means is in the form of a sliding belt or patch, the re-twisting means may be in the form of a flat;
Alternatively, various forms having sectors, sections, or protrusions may be used.

One retwisting means can cooperate with another similar retwisting means or can cooperate with other different retwisting means.

The retwisting means may include treatment means capable of acting on the yarn itself during the retwisting stage.

This treatment means may, for example, consist of diagonal sectors or protrusions or protrusions if the retwisting means are flat; if the retwisting means are disc-shaped, they may be arranged in various ways. It may consist of annular sectors or spiral sectors.

If treatment means are provided, this treatment means exerts a successive progressive rerotation action acting successively along the axis of the thread and on the thread itself, and at the same time substantially tangential action or Advantageously, the tangential and axial effects proceed uniformly and sequentially from the central part of the end region of the thread to the end of the end region of the thread.

The pressure exerted on the yarn causes mechanical concentration of the fibers and can cause the fuzzy portions of the yarn to aggregate as fibers, thereby creating a better bond.

In the device of the present invention, the retwisting means can be arranged such that both opposing retwisting means are of the same type or of different types.

According to yet another aspect of the invention, the device of the invention may include auxiliary means. This auxiliary means can, for example, heat the spliced yarn end, thereby stabilizing the splice itself,
It can be maintained in a substantially constant state over a long period of time.

This heating can be carried out by microwaves, electrostatic or dielectric action, heating or radiant plates, electrical discharge action, fluids at a predetermined temperature, etc., and the equipment used to produce the required heating is according to the invention. It has nothing to do with economics.

Alternatively, said auxiliary means may produce an interpenetrating action of the fibers of the two threads. In this case, a comb tooth means, a toothed means or a brush,
Suitable interengaging means may be included between the auxiliary means, or combinations thereof.

The auxiliary means may also include nozzle(s) for injecting a liquid under pressure, possibly with a certain temperature and/or additives.

The auxiliary means preferably operates internally between the intermediate tightening means, but can also operate at any desired location within the untwisting-retwisting means.

According to a further aspect of the invention, the pins, shafts, studs, protrusions or equivalent means may be configured to cooperate with at least one untwisting-retwisting means, and the It is possible to carry out the operation of pressing one side of the thread together against the other.

According to the invention, various means for moving the untwisting-retwisting means, means for activating the retwisting means, means for activating the means for laterally displacing at least one yarn, and fixing and tearing means are provided. The means for tightening and displacing can be obtained by the cooperative action of cams, levers, jacks, or other mechanical means of known type, or a combination of these means. .

Preferably, the untwisting-retwisting means and the retwisting means operate in a cooperative relationship such that movement of one of them has an effect on the other.

Therefore, the present invention is embodied by a splicing device that mechanically untwists and retwists the yarn, and in this case, the splicing device mechanically untwists and retwists the yarn to be spliced. - characterized by including a re-twisting means, the yarn is subjected to an untwisting action at a position where they do not interfere with each other, an action of removing and discharging the excess end of the thread, and a re-twisting action, and this yarn splicing device is characterized by the following: It is characterized by including a cooperative action with the elements of Namely, Γ means for laterally displacing at least one of the two threads Γ intermediate tightening means Γ fixing and tearing means Γ retwisting means Γ discharging means In the following, preferred embodiments of the present invention will be described by way of example.

In the drawings, identical parts having the same function are provided with the same reference numerals.

The yarn splicing device 10 for mechanically untwisting and retwisting yarn according to the present invention includes an untwisting-retwisting means 12, which in this example is two pairs of belts 112, and a positioning device for untwisting and retwisting the excess yarn ends. It has a positioning and tearing means 13 for tearing it (see Figs. 1 and 2).
figure).

The two pairs of belts 112, also referred to as "belts" hereinafter, are arranged so as to be suitable for the length of the yarn ends of the yarns 20, 21 where the splicing part is to be formed.
can preferably be spaced apart from each other in the longitudinal direction with respect to the threads 20, 21.

In the illustrated example, the belt 112 is
It is spanned between a pulley 14 which operates in conjunction with a drive belt 15 (FIG. 5).

In accordance with the present invention, a suitable rigid sliding surface 16 (not specifically shown in FIG. can be prevented.

The belts 112 are actuated such that the facing sliding surfaces 16 run in mutually opposite directions, thereby creating a rotational movement of the threads 20, 21 between each pair of belts 112, which rotational movement , belt 112
According to the associated running direction of the pair of belts 112
The untwisting or retwisting of the part of the spliced yarns 20, 21 consisting of lengths between is determined.

The structure of the belt 112, which is an untwisting-retwisting means used for untwisting and retwisting the yarns 20, 21 to be spliced, is preferably such that the yarns 20, 21 are connected to the splicing device 10.
They can be arranged in parallel inside.

According to the invention, the threads can also be arranged next to each other, but not parallel to each other or even intersecting each other.

In the illustrated embodiment, the positioning and tearing means 13 include the guiding means 17 and the fixing and tearing means 1.
8 or similar means, and lateral displacement means 19 for laterally displacing at least one of the two yarns 20, 21 to be spliced; It consists of, for example, hook means 22 or similar means capable of sliding in the transverse direction and means (not shown) for displacing the fixing and tearing means 18 in the transverse direction, cooperating with the hook means 22.

In order to splice the two threads 20, 21, one thread 20 is held aligned and taut in the guide means 17 by the fixing and tearing means 18 which hold the associated thread end 120. Ru. the other thread 21
are placed in place by the other securing and tearing means 18 which hold the associated thread end 121 (FIG. 2).

The lateral displacement means 19 can act on both threads to bring them together as shown in FIGS. 9a and 9b, and the guiding means 17 can They are arranged as shown in Figure 9b.

Due to the arrangement of the guide means, each of the threads 20, 21 engages with a lateral displacement means 19, for example consisting of a hook means 22.

Due to the arrangement of the guide means, the fixing and tearing means 18 can
They cannot cooperate in bringing the threads 20, 21 together and can only act during the picking and tearing stages of the threads.

Actuation of the belt 112 causes untwisting of the two yarn ends of the yarns 20, 21 held between the levels 112.

The threads 20, 21 to be spliced are then spliced by a lateral displacement of the thread 21 by the hook means 22 cooperating with the associated fixing and tearing means 18 in engagement with the thread 21; Displacement means 19 (Figure 9a)
By the lateral displacement of both threads 20, 21 by
They are aligned and aligned in the guide means 17.

The intermediate tightening means 23, which in the embodiment of FIG.
Tighten 1.

This means of intermediate tightening means that the excess yarn ends 120, 121 while the belt 112 is in a relaxed state
The purpose is to allow the picking operation and tearing action of
As a result, the tapered ends do not protrude from the splicing device without damaging the twist in the direction opposite to the direction of twist before untwisting imparted to the yarns 20 and 21 held between the intermediate tightening means 23. can get.

The intermediate tensioning means 23 can be actuated in cooperative relation with other parts of the splicing device by levers, cams, jacks or other suitable means.

Due to the operation of both fixing and tearing means 18, the thread 2
Each extra thread end 120, 12 from 0, 21
1's picking operation and tearing operation are performed, and the belt 1
This results in the formation of two tapered ends in the portions of the threads 20, 21 held between one pair and the other pair of 12, respectively.

Each pair 11 of belts 112, in this example,
For example, as shown in FIG.
Drive belt 15 for one pulley 14 of 2
It is operated by a motor 30 coupled via.

FIG. 7a shows the re-twisting stage (first stage) of the yarns 20, 21.
0a and 10b), the belt 11
The retwisting means 24 cooperating with 2 are shown.

In the illustrated embodiment, the retwisting means 24 are retwisting belts 124 arranged in pairs 26;
The retwisting belts 124 of each pair 26 are positioned opposite each other and rotate in opposite directions.

In this example, in order to introduce the yarns 20, 21 to be spliced and take out the yarn with the spliced portion formed, the untwisting/retwisting means, which is the belt 112 of each pair 11, and the untwisting/retwisting means of each pair 26 are used. The twisting means 24 can be opened at an angle to each other as shown in FIG. 6, thereby ensuring that the distance between the centers of the two pulleys 14 driven by the drive belt 15 remains constant.

The intermediate tightening means 23 can be configured in various ways with respect to the retwisting belt 124;
4 (see FIG. 7a) or can cooperate with an opening or cutout 27 formed in the retwisting belt 124 (see FIG. 8b).

This opening 27 allows the thread 2 to open when untwisting is carried out.
0, 21, the intermediate tightening means 23
0,21 is allowed.

The retwisting means 24 cooperate with the untwisting-retwisting means 12 during the retwisting stage to exert pressure on the aligned yarns 20, 21, so that the fibers are brought together and a compact joint is obtained.

Preferably, the retwisting means 24 are provided with treatment means 25, which in this example have oblique sectors and which exert a combined tangential and axial action on the yarns 20 and 21. Have a purpose of giving. The purpose of this is to improve the winding condition and to pull the fibers on the surface in the longitudinal direction as well.

Preferably, the processing means 25 has a large coefficient of friction against the yarn, but a small coefficient of friction against itself.

The intermediate tightening means 23, the retwisting means 24 and the untwisting-retwisting means belt 112, in their respective stages of operation, are subjected to suitable pressing means 28 (FIG. 7a).
is pressed against the threads 20 and 21 by the threads 20 and 21.

In this example, the pushing means 28 comprises a plurality of jacks 128, but also a plurality of levers, cams, rods, or other means that are actuated mechanically, electrically, pneumatically, or otherwise. or it may consist of any desired combination of these means.

As mentioned above, the belt 112 is provided in the longitudinal direction with respect to the yarns 20, 21 in order to change the length of the yarn ends of the yarns 20, 21 wrapped in the splicing portion depending on the properties of the yarns. can be separated.

In such a case, with different heights, the belt 1
It is possible to envisage a pair 26 of retwisting means 24 that can be exchanged to cooperate with the belt 112 when the desired distance of the twelve turns is changed.

It is therefore also possible to envisage an intermediate tightening means 23 whose position relative to the threads 20, 21 is adjustable in the longitudinal direction, this adjustment operation being carried out by known means which are not related to the invention. be done.

In FIGS. 2 and 7a, an extra thread end 12 is shown.
A discharge means 29 for discharging 0,121 is shown, and this discharge means is a suction discharge means 129 in this example, but the discharge means 29 may be realized by a mechanical means or a cooperative action of a mechanical means and a pneumatically actuated means. It can also be transformed into

Also shown in FIGS. 5, 7a and 8a is a motor 30 which produces rotational movement of the pulley 14.
shows. This motor 30 transmits its rotational motion to each pulley 14, with the direction of movement of one pulley being different from the direction of movement of the other pulley.

It can also be constructed with only one motor 30, the pulley 14 receiving this movement via suitable transmission means.

FIG. 7b shows the guiding means 17, the fixing and tearing means 18, and the lateral displacement means 19, in this example the hook means 22.

Figure 8a shows the front section to show the actuating pulley.

FIG. 8b shows a possible configuration of intermediate tightening means 23 cooperating with openings 27 in retwisting belt 124. FIG.

According to the invention, after the threads 20, 21 have been untwisted, they are aligned with each other by means of lateral displacement means 19.

The lateral displacement means 19 are adapted to move the untwisting-retwisting means 112 by gradually bringing the yarns 20, 21 closer to each other until they are aligned with each other at the end of the untwisting operation. can be engaged.

The intermediate tightening means 23 tightens the yarns 20, 21 so that the twist imparted to these yarns in a direction opposite to the direction of twist before untwisting is not lost.

The fixing and tearing means 18 is the extra yarn end 120,1
21 picking operation and tearing operation (9a)
), the remaining tapered ends 220, 221 are obtained (FIG. 9b), and the belt 112 is in a relaxed state.

Excess yarn ends 120 and 121 are fixed and cut by means 1
8 and is discharged by the discharge means 29.

The yarns 20 and 21 are then mutually retwisted by the cooperative action of the belt 112, which is an untwisting-retwisting means, and the retwisting belt 124 (FIGS. 10a and 10b), and in this case. The intermediate tightening means 23 has been released.

FIG. 11 shows another modification of the invention.
According to this modification, the untwisting-retwisting means 12
It consists of a cylinder 212 provided with a radial cutout 31 in which the 0, 21 can be positioned and held. This cylinder 212 is
The cylinders 212 are arranged at mutually diametrically opposite positions on the outside of the retwisting means 24 .
The axes of are aligned.

Cylinder 212 also has toothed sectors 32 on its outer surface. This sector 32 is
It engages with the driving rack 132, and the driving rack 1
32 is circular in this example, and the retwisting means 24
located outside of.

In the illustrated embodiment, the retwisting means 24 is a disc-shaped retwisting means 224.

The processing means 25 includes at least one retwisting means 22
4 and may be helical in shape, or may have concentric sectors, eccentric rings, or annular sectors eccentric to one diameter, etc.

The intermediate tightening means 23 are contained within and co-operate with the processing means 25 and are positioned and act in the manner described in detail above.

According to the invention, the intermediate tensioning means 23 may be independent as described above, or alternatively the processing means 23
It is also possible to cooperate with 5.

The intermediate tightening means 23 may have a slightly greater height and may also exhibit elasticity. This allows the processing means 225 to be tightened by using a relatively large pressure when the disk-like retwisting means 224, initially operated together with the intermediate tightening means 23, are brought together before the final retwisting operation. becomes active.

In the illustrated embodiment, cylinder 212
can be moved diametrically relative to the retwisting means 224 to adjust the length of the yarn ends of the yarns 20, 21 affected by the splice. This means that the cylinder 212 can be a mechanical or pneumatically actuated adjustment means or another type of adjustment means 1.
This is because it is supported by the bracket 33 connected to the bracket 33.

The fixing and tearing means 18 can be mechanical means 118, for example a pair of rollers 218, 318, which can move in a direction transverse to the thread 20 or 21 gripped therebetween. roller 2
The rotational movement of 18,318 can be stopped to hold the thread 20 or 21. or,
The fixing and tearing means 18 can also be pneumatically actuated means 418.

FIG. 11a shows by way of example a roller 218 and a pneumatic actuating means 418, which in this example
It consists of a suction opening in the form of a loop 34 to further improve the fixation of 20.

In this example, this suction port is connected to the ejection means 12.
It can be rotated around the pivot point 35 in order to carry out the pinching and tearing operations of the thread end 120 released from the thread end 120 .

The threads 20, 21 engage with the groove 31 of each cylinder 212 and the fixing and tearing means 18, so that the thread 2
0 and 21 are arranged in a parallel positional relationship by a stationary thread guide 36 or by a movable thread guide 136.

The movable thread guide 136 is unnecessary if the fixing and tearing means 18 cause the threads 20, 21 to be aligned with each other by appropriate lateral movements.

Rack 132 imparts rotation to cylinder 212 to untwist yarns 20, 21 by the desired angle.

The threads are then brought into juxtaposition with each other by movement of means 118 or 136 in the direction of arrow 37.

At the end of the untwisting operation, the grooves 31
By being on one side and acting inwardly, it is possible to force the threads together.

The threads 20, 21 are tightened by intermediate tightening means 23 in opposing positions and cooperating with the retwisting means 224 and the opposing disc-shaped retwisting means (not shown).

The pinching and tearing action exerted on the thread ends 120, 121 is carried out in this example by moving the fixing and tearing means 118 or 418 in the direction of the arrow 38. The groove 31 is the thread 20,2
1 is rotated by a rack 132 so that it does not come out of the groove 31 during the picking and tearing operations.

The movement of the fixing and tearing means 18 can also be along the axis of the yarn or the axis of the splice, or in rotation thereof.

The thread ends 120, 121 are ejected by means of ejecting means 129, which operation is carried out after release of said fixing and tearing means 18, if said means 18 are mechanical.

A rotation in a direction opposite to the initial direction of rotation is then imparted to the cylinder 212 which cooperates with the actuation of the retwisting means 224. At least one of the retwisting means is provided with a processing means 25 to obtain the desired retwisting effect on the two yarns 20, 21.

According to each illustrated embodiment of the invention, auxiliary means 39 are contemplated.

A possible arrangement of this auxiliary means 39 is shown in FIG. 12 in conjunction with the disc-shaped retwisting means 224.

Although some desirable configurations of the present invention have been described above, many changes can be made without departing from the scope of the invention.

Each portion can be added to, subtracted from, or otherwise changed in shape and/or proportions.

The different configurations described above and shown in the drawings can be combined. Further modifications may occur to those skilled in the art without departing from the basic idea of the invention.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing the untwisting/retwisting means in an exploded state in order to clarify the structural features of the yarn splicing device of the present invention. 2 is an elevational view of the piecing device of FIG. 1 showing means for positioning the ends of the yarn between the untwisting-retwisting means and between the intermediate tightening means and the ejecting means; FIG. 3 and 4 are schematic diagrams showing the action of the untwisting-retwisting means on the yarn. Figure 5 shows the first
The yarn splicing device of the present invention is shown with the two pairs of untwisting-retwisting means disassembled as in the case of the figure, and the belt means for operating the two pairs of untwisting-retwisting means and the intermediate tightening means are clearly shown. FIG. FIG. 6 is a plan view showing the opening positions of a pair of untwisting/retwisting means when introducing and removing yarn from the yarn splicing device of the present invention. FIG. 7a is a diagram showing the configuration of the reburning means in the apparatus shown in each of the above figures. Figure 7b is a front view of half of the splicing device of the invention showing the untwisting-retwisting means, the lateral displacement means, the fixing and tearing means, the intermediate tightening means and the retwisting means; FIG. 8a is a partial cross-sectional view of the splicing device of the invention in which the pulleys can be seen. FIG. 8b shows a possible arrangement of the intermediate clamping means. Figures 9a, 9b, 10a and 10b show the device in operational stages. Figures 11a and 11b illustrate another embodiment of the invention. FIG. 12 shows a possible configuration of the auxiliary means. 10... Yarn splicing device, 12... Untwisting-retwisting means, 13... Positioning and tearing means, 14... Pulley, 15... Belt, 17... Guide means, 18
... Fixing and tearing means, 19 ... Lateral displacement means, 2
0, 21... Thread, 22... Hook means, 23...
Intermediate tightening means, 24... Re-twisting means, 25... Processing means, 27... Opening, 28... Pressing means, 29...
...Discharge means, 30...Motor, 31...Groove, 3
2...Sector, 33...Bracket, 34...
Loop, 35... Pivot joint, 36... Thread guide, 3
9... Auxiliary means, 120, 121... Yarn end.

Claims (1)

[Scope of Claims] 1. A device 10 for piecing yarns by mechanically untwisting and retwisting yarns, comprising: - untwisting the yarns 20-21 to be spliced at a position where they do not interfere with each other; means for arranging the yarn to be acted upon; - untwisting-retwisting means 12 for untwisting and retwisting the yarns 20-21 to be spliced; - at least one of the two yarns 20-21. - means 19 for laterally displacing the thread; - intermediate tightening means 23 consisting of at least one element movable in the transverse direction of the thread; - fixing and tearing means for gripping and tearing the thread ends 120-121; - a retwisting means 24 arranged between the untwisting and retwisting means;