JPH04263649A - Method and device retaining yarn in spinning machine - Google Patents

Abstract

PURPOSE: To reserve a sufficient length of a yarn even when a trouble occurred in yarn texturing process. CONSTITUTION: The subject method and arrangement have such a scheme that a yarn 3 carried from a feeder 12 to a suction unit P2 forms a loop with lower and upper parts 4a, 4b by the aid of airflow running into a housing section 1, thus affording a reserved yarn of a specified length. The lower part 4a moves into the housing section 1, while the upper part 4b (exit side) is fixed because the yarn 3 is held by a gripper 15. The lower side 4a and upper side 4b are surely separated from each other, the fixed end of the lower part 4b being subjected to slight instantaneous force enabling the yarn loop to be returned to the original position. Such an instantaneous force is transmitted either by the action of the gripper 15 or by an additional guide 16 intermittently operating the fixed side at the outlet of the housing section 1.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is applicable to the textile industry.
The present invention relates to a yarn holding method and apparatus for a spinning machine that temporarily stores yarn in case of yarn breakage when obtaining a final product from yarn formation such as a fabric.

0002

BACKGROUND OF THE INVENTION In the textile industry, there is the problem of having to temporarily store yarns of predetermined lengths at different stages of the transformation of raw materials, such as textiles, from yarn formation to obtaining the final product. often occurs. Problems of this type also occur, for example, in various spinning machines and require intervention as a result of interruptions or to eliminate defects. Also,
In such cases, it is desirable that the above operations be performed without interfering with manufacturing. Similar problems occur with weaving machines, especially so-called shuttleless weaving machines. In this case, during the actual weft thread insertion process, the required thread length for the next weft thread insertion is prepared.

[0003] In both cases, this type of holding device is
It is formed by the fact that upstream of a defined area, the thread is transported at a constant speed. On the other hand, downstream of said region, the threads are transported at different speeds or are stationary (or vice versa). Such problems have remained unsolved for a long time, and FR-A-1 4
It is also clear from 04 286. This describes a solution that makes it possible to join the threads in the winding machine without interfering with the work. Also, FR-A-1
No. 581 247 furthermore describes a solution applicable to hata looms, according to which the yarn is stored in a loop.

[0004] The details are given in lines 12 to 20 on page 1, and this solution allows the thread to be guided along a relatively flat duct opening and to by using a flow of air directed across the passageway of the
It is stated that the duct collects excess thread in a loop. Such a solution is described in French patent no.
1,152,147.

[0005] As described above, many other proposals have been made in the field of spinning and weaving machines.
Following these documents, in particular FR-A-2,351,
195, FR-A-2, 495, 196, FR-A-2
,355,932 and FR-A-2,323,783
It can be seen in

[0006]

[Problem to be Solved by the Invention] By the way, the above-mentioned solution in the field of weaving makes it possible to store a sufficient length of yarn, which is the width of a shuttle-less weaving machine. This is because the distance does not exceed 2 meters. On the other hand, in the field of spinning, the above solutions are carried out in systems with slow operating cycles, which do not allow joining (or splicing) operations. Also, as a result, it is necessary to carry very long threads in the spinning machines or in the robotized parts that carry out the joining operations. Thus, for example, with machines and binding systems working at 10 m/s, their working cycle will be of the order of 2 seconds and it is necessary to carry 20 m of thread. However, currently there is no such solution.

[0007] This problem will be explained in the following manner by reference to the attached FIG. In FIG. 1, if storage is to be carried out inside a relatively flat duct 1, the inlet slot 2 will have a rectangular cross-sectional shape;
The height L is, for example, 50 mm. The yarn 3 moves vertically through said inlet slot 2 (in spinning machines, the movement usually takes place in the longitudinal direction). Also, the air flow moving at speed V forms a long loop in the vertical plane. On the other hand, the thread has a predetermined mass per unit length P, and is subjected to tension T. The upper part 4b of the loop 4 is
Depending on the thread fatigue and air velocity, 0
．． It is tilted at an angle of 5 to 1 degree. On the other hand, the lower part 4a is kept horizontal and supported by the bottom wall of the duct 1.

According to this, for example, the initial length L is 5
In the case of 0 m, a reliable loop with a length of 2 to 4 m can be formed (i.e., in other words, 4
Store only ~8m of thread). As a result, for example, if one were to obtain a loop length equivalent to a coupling device (knotter, system for forming joints, etc.) with a slow operating cycle of 2 seconds, then in this case, as mentioned above, approximately 20 m. It is necessary to store up threads. A logically conceivable solution therefore lies in reducing the value of angle α. Reducing this angle α requires an increase in the thread tension, which from a weaving point of view is a serious drawback and involves an increase in the air velocity V, resulting in head losses and wasted energy. Become. The height L of the inlet slot 2 is also
It is conceivable that the length be increased for the purpose of accumulating a desired length. However, in this case the cross section, air flow and energy waste are increased, and in addition, the space required is considerably larger.

Another possible theoretical solution consists in the formation of loops in horizontal ducts. In this case, the problem arises when, as mentioned above, in spinning machines, the yarn moves in a vertical plane and therefore passes through the loop from the vertical plane to the main horizontal storage plane. In tests carried out in this context, there is indeed a tendency for the two parts of the loop to move in one direction, and when this direction changes, this creates the problem of thread tangling.

The present invention was made in view of the above-mentioned circumstances, and it is possible to form a yarn loop having two parts that are completely separated from each other, and the length can be easily increased to 20 m or more. Furthermore, the storage section for the yarn can be made small, and the storage section can have a shape other than a rectangle.
It is also an object to provide a method and device for holding yarn in a spinning machine, which can be bent in various directions and whose position is not limited with respect to the structure of the machine.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the invention according to claim 1 has a relatively flat rectangular cross section and is arranged vertically facing the thread path. The thread is guided in a fluid flow motion into a containment having an inlet, forming a two-part loop, and one of the threads is guided into the containment part by a constant flow. guiding the other end of the thread at a speed and keeping the other end of the thread stationary inside the container during the formation of the loop, separating the two parts and applying an instantaneous force to the other end of the thread that is fixed. and returning the thread loop to its original position and reforming the thread loop by rubbing it against the wall of the receptacle.

[0012] In the invention as claimed in claim 2, in the yarn holding method for a spinning machine as claimed in claim 1, the yarn loop is twisted to become very long in order to pass from the vertical entrance surface to the horizontal storage surface. the holding space of the holding space is such that the two parts of the loop are arranged at least in the same horizontal plane of the cross-section of the holding space, except for changes in direction of the holding space; The instantaneous force applied to the other fixed end of the thread, configured in many different directions, causes the end of the formed loop to pass through a transition region between two different holding surfaces. It is characterized by being given immediately after.

In the invention as set forth in claim 3, in the yarn holding method for a spinning machine as set forth in claim 1, the rectangular cross-sectional shape of the storage portion is divided into two parts for each of the two portions of the loop. configured to form passageways, said passageways being connected together by a free region through which said yarn passes;
The rectangular cross-sectional configuration is characterized in that the configuration tends to keep the moving one of the loops separated from the fixed other of the loops in the region where the passages tend to move towards each other. do.

[0014] In the invention as set forth in claim 4, the yarn has a relatively flat rectangular cross section and is disposed vertically facing the thread path.
guiding the yarn in accordance with the movement of the fluid flow into a containment having an inlet, forming a loop consisting of two parts, and guiding one of the threads at a constant speed into the interior of the containment; , fixing the other end of the thread against movement into the interior of the receptacle during loop formation, separating the two parts and applying an instantaneous force to the fixed other end of the thread. A yarn holding device for a spinning machine, characterized in that it is provided with means for applying pressure.

[0015] In the invention as set forth in claim 5, in the yarn holding device for a spinning machine as set forth in claim 4, the storage section is twisted in order to pass from the vertical entrance surface to the horizontal storage surface, and the holding space of the storage section is , configured in many different directions, said instantaneous force applied to the other fixed end of said thread at least in the transition area between the two different holding surfaces of the end of said loop formed. It is characterized by being given immediately after passing through.

[0016]

According to the invention as set forth in claim 1, the thread is guided into the interior of the storage part according to the movement of the fluid flow, and a loop consisting of two parts is formed. One of the threads is then guided at a constant speed into the interior of the storage, and the other thread is fixed against movement into the interior of the storage during the formation of the loop. and by applying an instantaneous force to the other end of the fixed thread, returning it to its original position against the other of the thread loops, causing the thread loops to rub against the walls of the enclosure. Reshape.

[0017]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram for explaining the formation of a loop of yarn sucked into the storage duct according to the flow of fluid. Note that the symbols shown in FIG. 1 are also used for the same components in other figures. The method according to the invention applies in particular to any type of textile machine, such as the spinning machine shown in FIG. 2, in particular for the uninterrupted coupling of the flow of material threads 3. In this device, if the joining operation is to be performed without interrupting the flow of the yarn 3, the procedure must be performed as shown in FIG.

In this type of device, the yarn 3 conveyed by the feeding device 12 is fed by a suction section P2 that applies sufficient tension to prevent the yarn 3 passing in front of the entrance slot 2 of the storage section 1 from being sucked in as it is. Transferred from device 12. Further, the other end of the yarn 3 supplied from the yarn winding system 13 is locked and is conveyed to the suction section P1. This suction section P1 applies a slight tension to the yarn being conveyed. The two ends are introduced inside a known coupling device 14 which allows the joining.

The suction parts P1 and P2 can pull out the two ends of the cut thread after the joining has taken place. A cycle of binding is started by bringing the gripper 15 closer to hold the yarn 3 conveyed from the feeding device 12. When the flow of thread 3 is interrupted, the coupling device 14 is activated. During this bonding phase, the yarn 3 conveyed from the feeding device 12 is stored and the length of the yarn 3, depending on the time required for bonding and the conveyance speed, is 600 m/min, as described above.
20 m for a machine running at min. and having a bonding time of 2 seconds.

According to the method of the invention, the thread 3 conveyed from the feeding device 12 is divided into two parts, a lower part 4a and an upper part 4, which are obtained by the flow of air flowing into the interior of the storage part 1.
Since b forms a loop, a retained yarn of a predetermined length is obtained.

In forming the loop, the lower part 4a moves into the interior of the container 1, and the upper part 4b (outlet side) is fixed because the thread 3 is held by the gripper 15. According to the method of the invention, the lower part 4a and the upper part 4
b, the fixed end of the lower part 4b receives only a small momentary force which allows the thread loop to return to its original position. Such instantaneous forces are transmitted either by the action of the gripper 15 or by an additional guide 16 that moves the stationary side intermittently at the outlet of the storage part 1.

[0022] The storage unit is operated by the above-described procedure.
This is achieved not only by being arranged perpendicularly to the thread path, but also by being threaded through a very long horizontal plane, as shown in FIG. By doing so, the stress due to gravity is removed, but in addition, the storage section 1 can also have a shape other than a rectangle. As a result, this type of storage can be adapted to many different types of machines, as long as the volume is kept to a minimum.

As described above, FIGS. 4 and 6 are diagrams showing the configuration of one embodiment. In this figure, the storage part 1 has changed from a vertical position to a planar transfer area, which is tilted with respect to the horizontal. The storage part 1 also comprises two superimposed horizontal members. This type of embodiment is particularly useful when each working position is provided in one storage.

FIGS. 7 and 8 show two embodiments of containment ducts made possible by the method according to the invention. In this figure, the storage ducts may be a "robot" type system that can be moved to the front of each location on the machine. In two versions of these embodiments, the inlet region of the duct shown is arranged vertically facing the thread path and is twisted to form a vertically oriented flat duct; In the embodiment shown in FIG. 7, it is bent horizontally;
In the embodiment shown in FIG. 8, it is bent vertically.

[0025] In the method according to the invention, a loop of stored thread having a length of 20 m can be formed by using the storage section described above. Inside the storage section above, there are 50
It is maintained at a reduced pressure of ~250 mb and has a flow rate of 10 m3/h at normal temperature and pressure. Further, the storage section includes a rectangular entrance section 2 with L=50 mm and e=4 mm.

[0026] Also, by adapting the internal structure of the storage duct, it is possible to keep the yarn loop separated into two parts. This structure is formed by two channels separated by two beads, with a sufficiently large space to allow the thread to pass through. This space is adapted to have the structure shown in FIG. 5(b) in the region where the direction changes. In this FIG. 5(b), the two passages are asymmetrical, thereby keeping the two parts of the loop, the lower part 4a and the upper part 4b, apart. Note that the present invention is not limited to the embodiments described above, and may be modified according to the same principle.

[0027]

As described above, according to the present invention, there is provided a storage section having a relatively flat rectangular cross section and having an inlet section disposed vertically facing the thread path. The thread is guided inside the housing according to the movement of the fluid flow, forming a two-part loop, one of the threads is guided at a constant speed into the interior of the storage, and the other of the thread is , during the formation of the loop, without movement into the interior of the container, separating the two parts and applying an instantaneous force to the other end of the thread, which is fixed, the other end of the thread loop is returned to its original position and reformed by rubbing the loop of thread against the wall of the receptacle, thus forming a loop of thread having two parts completely separated from each other. and the length can be easily increased to 20 m or more, and furthermore, the storage part for the thread can be made small, and the storage part may have a shape other than a rectangle, and can be bent in various directions. The advantage is that its location is not restricted with respect to the structure of the machine.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram for explaining the formation of a loop of yarn sucked into a storage duct according to a fluid flow in a general spinning machine.

FIG. 2 is a diagram showing the configuration of an embodiment in which the method of the present invention is applied to a spinning machine.

FIG. 3 is a perspective view showing the structure of a storage section to which the method of the present invention is applied.

FIG. 4 is a side view showing the structure of the storage part that made it possible to accumulate very long yarn loops according to the method of the invention;

5(a) is a sectional view on the XX axis of FIG. 3 showing the internal structure of the storage section, and FIG. 5(b) is a sectional view showing the internal structure of the storage section with the direction changed.

FIG. 6 is a side view showing the structure of an embodiment of a spinning machine equipped with a storage section of the present invention.

FIG. 7 is a side view showing the structure of an embodiment of a spinning machine in which a storage section of the present invention is installed on a robot-type unit.

FIG. 8 is a side view showing the structure of a modified example of a spinning machine in which the storage section of the present invention is installed on a robot-type unit.

[Explanation of symbols]

1 Storage part 2 Entrance slot (entrance part) 3 Thread 4 Loop 4a Upper part (other side of thread) 4b Lower side (one side of the thread) 12 Supply device 13. Winding system 14 Coupling device 15 Gripper 16 Guide P1, P2 Suction part

Claims (5)

[Claims] 1. The thread is placed inside a storage part (1) having an inlet part (2), which has a relatively flat rectangular cross section and is arranged vertically facing the thread path. guiding it according to the movement of the fluid flow, forming a loop consisting of two parts (4a, 4b), guiding one of said threads (4a) into the interior of said storage part (1) at a constant speed, said The other part of the thread (4b) is kept stationary during the formation of the loop into the interior of the container (1), separating the two parts (4a, 4b) and keeping the other part of the thread (4b) fixed. ) by applying an instantaneous force to the end of the yarn loop back to its original position against the other (4b) of the yarn loop and reforming the yarn loop by rubbing it against the wall of the receptacle. A yarn holding method for a spinning machine characterized by the following. 2. The thread loop (4) is held inside the receptacle (1) so that it is very long and is twisted to pass from the vertical entry surface to the horizontal receptacle surface. The holding space of the yarn can be configured in many different directions such that, apart from a change in direction of the receptacle, the two parts of the loop are arranged at least in the same horizontal plane of the cross-section of the holding space, and the other of the yarn ( Claim characterized in that the instantaneous force applied to the fixed end of 4b) is applied immediately after the end of the formed loop passes through a transition region between two different holding surfaces. Item 1. A method for holding yarn in a spinning machine according to item 1. 3. The storage portion (1) has a rectangular cross-sectional shape,
For each of the two parts (4a, 4b) of said loop (4), it is arranged to form two separate passages, said passages being connected together by a free area through which said thread passes. , said configuration of rectangular cross-sectional shape keeps the moving one of said loops (4a) separated from the fixed other of said loops (4b) in the region where said passages tend to move towards each other. 2. The method of holding yarn in a spinning machine according to claim 1, wherein 4. The thread is placed inside a storage part (1) having an inlet part (2) having a relatively flat rectangular cross-section and arranged vertically facing the thread path. guiding it according to the movement of the fluid flow, forming a loop consisting of two parts (4a, 4b), guiding one of said threads (4a) into the interior of said storage part (1) at a constant speed, said fixing the other part of the thread (4b) immovably inside said receptacle (1) during the formation of the loop, separating said two parts (4a, 4b);
A yarn holding device for a spinning machine, comprising a pressing means (16) that applies an instantaneous force to the other fixed end (4b) of the yarn. 5. The receptacle (1) is twisted to pass from a vertical entrance surface to a horizontal receptacle surface, and the holding space of the receptacle is configured in many different directions, with the other fixed position of the thread being twisted. 5. The instantaneous force applied to the formed end is applied at least immediately after the formed end of the loop passes through a transition region between two different holding surfaces. Yarn holding device of spinning machine.