阅读说明：本技术 用于纺织机的接头单元的纱线抽吸装置 (Thread suction device for a piecing unit of a textile machine ) 是由 耶加纳森·帕苏帕蒂 马蒂古恩登帕蒂·吉里拉吉·迪潘·马鲁达查拉姆 于 2020-04-28 设计创作，主要内容包括：公开了一种用于对环锭纺纱机中的断纱进行接头的自动接头单元(1)。设置有用于从纬管(4)抽吸断纱端部的抽吸组件。抽吸组件包括抽吸管(2),抽吸管具有位于面向纬管(4)的端部处的抽吸嘴(3)。抽吸管(2)定位在纬管(4)上方的预定高度处,以从纬管(4)抽吸断纱端部。第一文丘里喷射件(5a)与抽吸嘴(3)固定,以从压力供应端口接收压缩空气。压缩空气通过第一文丘里喷射件(5a)的收缩区段的运动在抽吸嘴(3)中产生真空,以将断纱端部从纬管(4)抽吸到抽吸管(2)中。(An automatic piecing unit (1) for piecing broken yarns in a ring spinning machine is disclosed. A suction assembly is provided for sucking the ends of the broken threads from the weft (4). The suction assembly comprises a suction tube (2) having a suction mouth (3) at the end facing the weft tube (4). The suction tube (2) is positioned at a predetermined height above the weft (4) to suck the broken ends from the weft (4). The first venturi injector (5a) is fixed with the suction nozzle (3) to receive compressed air from the pressure supply port. The movement of the compressed air through the constricted section of the first venturi jet (5a) creates a vacuum in the suction nozzle (3) to suck the broken yarn end from the weft tube (4) into the suction tube (2).)

1. An automatic piecing unit (1) for piecing broken yarns in a ring spinning machine, the automatic piecing unit (1) comprising:

-a suction assembly for sucking a broken end from a weft (4), wherein the suction assembly comprises:

a suction tube (2) having a suction mouth (3) at the end facing the weft (4), the suction tube (2) being positioned at a predetermined height above the weft (4) to suck the broken ends from the weft (4); and

a first venturi jet (5a) fixed with the suction tube (2) to receive compressed air from a pressure supply port, wherein the compressed air generates a vacuum in the suction nozzle (3) by the movement of the converging section of the first venturi jet (5a) to suck the broken yarn end from the weft tube (4) into the suction tube (2).

2. The automatic joint unit (1) according to claim 1, wherein the velocity of said compressed air increases when passing through said converging section of said first venturi jet (5a), causing a vacuum in said suction mouth (3).

3. Automatic piecing unit (1) according to claim 1, wherein the suction pressure for the first venturi jet (5a) is maintained within a suitable operating range, preferably 50mbar to 70mbar, until the end of the cut yarn is picked up.

4. Automatic piecing unit (1) according to claim 1, further comprising a second venturi jet (5b) connected at the end of the suction tube (2) remote from the weft tube (4).

5. Automatic piecing unit (1) according to claim 4, wherein compressed air is provided for operating the second venturi jet (5b) on the basis of an output of a sensor positioned within the suction tube (2), and wherein the sensor provides the output when the presence of the broken yarn end in the suction tube (2) is detected.

6. Automatic piecing unit (1) according to claim 5, wherein the supply of compressed air to the first venturi jet (5a) is interrupted when the second venturi jet (5b) is operating.

7. Automatic piecing unit (1) according to claim 4, wherein the suction pressure for the second venturi jet (5b) is maintained within a suitable operating range, preferably 30mbar to 50mbar, until the picked up broken yarn is delivered for piecing.

8. The automatic connector unit (1) according to claim 4, wherein the first venturi jet (5a) and the second venturi jet (5b) have a plurality of flow controls.

9. The automatic joint unit (1) according to claim 8, wherein the suction pressure for said first venturi jets (5a) and said second venturi jets (5b) due to the flow of compressed air is varied by flow control.

10. Automatic piecing unit (1) according to claim 8, wherein the time at which the plurality of flow controls are provided varies according to the pick-up requirements of the broken yarn end.

11. Automatic piecing unit (1) according to claim 1, further comprising at least one air jet at the bottom of the weft tube (4) to assist in sucking the broken yarn end into the suction tube (2).

12. A method for automatically piecing a broken yarn in a ring spinning machine, the method comprising:

-sucking a broken end from a weft (4) using a suction assembly having a suction tube (2) with a suction mouth (3) at the end facing the weft (4) and at least one first venturi jet (5a) positioned at a predetermined height above the weft (4), said first venturi jet being fixed with the suction tube (2), said first venturi jet receiving compressed air from a pressure supply port, wherein the movement of the compressed air through a converging section of the first venturi jet (5a) creates a vacuum in the suction mouth (3) to suck the broken end from the weft (4) into the suction tube (2).

13. The method according to claim 12, wherein the velocity of the compressed air increases when passing through the constricted section of the first venturi jet (5a), resulting in a vacuum in the suction mouth (3).

14. Method according to claim 12, wherein the suction pressure for the first venturi jet (5a) is maintained within a suitable operating range, preferably 50 to 70mbar, until the end of the yarn break is picked up.

15. Method according to claim 12, wherein compressed air is provided to a second venturi jet (5b) connected at the end of the suction tube (2) remote from the weft tube (4) for operating the second venturi jet (5b) based on the output of a sensor positioned within the suction tube (2), and wherein the sensor provides the output when the presence of the broken yarn end in the suction tube (2) is detected.

16. Method according to claim 15, wherein the supply of compressed air to the first venturi jet (5a) is interrupted when the second venturi jet (5b) is operating.

17. Method according to claim 15, wherein the suction pressure for the second venturi jet (5b) is maintained within a suitable operating range, preferably 30mbar to 50mbar, until the picked up yarn break is delivered for splicing.

18. The method according to claim 15, wherein the first venturi jet (5a) and the second venturi jet (5b) have a plurality of flow controls.

19. Method according to claim 18, wherein the suction pressure for the first venturi jet (5a) and the second venturi jet (5b) due to the flow of compressed air is varied by means of flow control.

20. The method of claim 18, wherein the time to provide the plurality of flow controls varies according to a pick-up requirement of the end of the cut yarn.

21. A method according to claim 12, wherein at least one air jet is provided at the bottom of the weft tube (4) to assist in sucking the broken yarn end into the suction tube (2).

Technical Field

The invention relates to a spinning ring spinning machine. In particular, the invention relates to a yarn suction device for an automatic yarn piecing unit in a ring spinning machine. More particularly, the present invention relates to a broken yarn pickup device to separate a broken yarn end from a spinning cop, thereby enabling an automatic piecing operation in a spinning ring spinning machine.

Background

Ring spinning machines are the final yarn production machines in textile spinning mills, which are very critical machines. The ring spinning machine produces cotton in the final form, the so-called yarn, in the spinning process. Yarn breakage, which often occurs in ring spinning machines, is a major problem facing the spinning industry worldwide. Yarn breakage must be continuously monitored and the broken yarn must be immediately spliced by a worker. Yarn breakage is caused by various parameters of the yarn and the machine and is inevitable. In long spinning frame stations, the yarn breakage is monitored manually continuously and manually pieced all the time while traveling along the path of the ring frame. This is necessary for a frame that typically contains more than 1600 spindles and is about 75 meters long. After successful piecing of the yarn break, the yarn spinning process (and therefore the spindle of each yarn break) must then be restarted in order to avoid wasting yarn.

In order to overcome the above problems, automatic joint units are being developed. The automatic joint unit is in the form of a movable vehicle with a guiding device. The splicing vehicles stop at the respective broken yarn spindle locations where splicing attention needs to be paid to. The joint unit is typically moved longitudinally on the rack channel. Before starting the piecing operation, the piecing vehicle stops in front of the spindle position of the ring spinning machine. The end of a broken yarn available in the spinning cop must then be found and detached from the cop, which is then lifted upwards to enable the splicing operation. Said automatic separation of the yarn from the spinning weft is often a very difficult task.

Extensive tests have been carried out over the last few years in order to successfully implement automatic piecing units in textile spinning machines. However, automatic joint devices have not been implemented to date because of the difficulties involved. In the existing piecing devices under test, the automatic piecing units were moved longitudinally along the path of the ring spinning machine. Ring spinning machines are capable of winding a yarn onto a bobbin, a so-called weft, mounted on a spinning spindle. When yarn breakage occurs during the spinning process, the broken yarn becomes entangled in the spinning weft. In order to be able to splice the yarns, the entangled yarn ends must be separated from the weft. In order to pick up the end of a broken yarn from the weft, the automatic piecing unit is usually provided with a suction device. A cylindrical suction nozzle with a mouth/opening extends from the piecing unit and is usually positioned at a predetermined distance above the top of the spinning weft to suck the yarn end from the weft. To provide the required suction, a suction motor is typically used. Existing suction motors are large in size and expensive. Furthermore, due to its size, the suction motor occupies a considerable space in the automatic joint unit. This leads to an increase in the mass of the automatic joint unit, in addition to an increase in costs.

There is a need to develop an improved method of picking up a broken yarn from a weft tube which alleviates the space and cost of an automatic piecing unit, to which the present invention provides a solution. The present invention provides an improved device for picking up a broken end from a spinning weft to enable automatic piecing in a ring spinning machine.

Disclosure of Invention

The main object of the present invention is to provide an improved automatic piecing unit for textile ring spinning machines.

Another object of the present invention is to provide a mechanism for improving yarn take-up which saves space and reduces the cost of the automatic piecing unit of a textile ring spinning machine.

Another object of the present invention is to provide a broken yarn pick-up device for picking up a broken yarn from a spinning weft in an automatic piecing unit of a textile ring spinning machine, which has an improved suction device.

This summary is provided to introduce aspects related to systems and methods for predicting volumetric data, and these aspects are further described below in the detailed description. This summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining or limiting the scope of the claimed subject matter.

In one non-limiting embodiment, an automatic piecing unit for a yarn piecing operation during a yarn breakage event in a ring spinning machine is disclosed. In order to successfully splice the ends of the broken yarn, the ends of the broken yarn must be properly picked up/separated. To this end, an automatic connector unit with a suction assembly comprising a suction tube with a suction opening/mouth is provided. The suction assembly is movable from top to bottom to be displaced at a predetermined distance at the top of the weft tube. The suction assembly also comprises a venturi jet, instead of a large suction motor, for picking up the yarn end from the weft. The venturi jet is designed such that it receives compressed air and blows air into the suction tube in the opposite direction to the weft, i.e. upstream of the weft. The venturi jet has a plurality of inlets that blow air in a tapering manner into the venturi jet interior, thereby creating suction in an upward direction within the suction tube to lift the broken yarn end from the weft tube. The compressed air leaving the venturi jet at the outlet therefore generates a suction force in an upward direction, which in turn picks up the yarn end from the weft.

In one embodiment, the automatic joint unit includes two venturi jets (i.e., a first venturi jet and a second venturi jet) having a plurality of flow controls, rather than a suction motor. In addition to the venturi jets, a plurality of air jets are provided around the bottom of the weft to help lift the broken ends (not shown).

In another non-limiting embodiment, a method for automatically piecing broken yarns in a ring spinning machine is disclosed. The method may comprise sucking the end of the broken yarn from the weft tube using a suction assembly. The suction assembly may comprise a suction tube having a suction nozzle at an end facing the weft tube. The suction tube may be positioned at a predetermined height above the weft tube. At least one venturi jet may be secured to the suction tube, and the venturi jet may receive compressed air from the pressure supply port. The movement of compressed air through the converging section of the venturi jet can create a vacuum in the suction nozzle to draw the broken end from the weft tube into the suction tube.

Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.

Drawings

Fig. 1 shows a schematic side view of a suction assembly of an automatic joint unit according to an embodiment of the invention.

Fig. 2 shows a perspective view of a venturi injection device of an automatic joint unit according to an embodiment of the present invention.

Detailed Description

Embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which like numerals refer to like elements throughout the several views, and in which exemplary embodiments are shown. The claimed embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The examples set forth herein are non-limiting examples, and are merely examples of other possible examples.

Referring to fig. 1, which shows a schematic side view of the suction assembly of the automatic joint unit 1, the operation of the automatic joint unit 1 is explained. The automatic piecing units 1 move longitudinally along the path of the ring spinning machine. A ring spinning machine is capable of winding a yarn onto a bobbin, a so-called weft 4, mounted on a spinning spindle. When a yarn break occurs during the spinning process, the broken yarn becomes entangled in the spinning weft 4. In order to be able to splice the yarns, it is necessary to separate the broken or tangled yarn ends from the weft 4. The suction assembly of the automatic piecing unit 1 provides the suction required to pick up the end of the broken yarn from the weft 4. The suction assembly comprises a suction tube 2, which may be cylindrical in shape and may have a suction mouth/opening 3. The suction tube 2 is displaced at a predetermined height at the top of the weft 4 in order to suck the broken ends from the weft 4.

As shown in fig. 1, the suction assembly is provided with a venturi jet, instead of a suction motor, for picking up the end of a broken yarn from the weft 4. Preferably, two venturi jets (i.e. a first venturi jet 5a and a second venturi jet 5b) can be used to suck the broken ends from the weft 4. As an example, multiple venturi jets may also be used. The first venturi jet 5a is fixed adjacent to the suction tube 2. The second venturi jets 5b are fixed away from the suction mouth 3 at the more distal end of the suction assembly, as shown in figure 1. The compressed air from the pressure supply port or the ring spinning machine suction unit or the spinning mill suction unit or any source can pass through in sequence inside the first venturi jet 5a and the second venturi jet 5 b. As the compressed air flows into the first venturi jets 5a, the converging section of the first venturi jets 5a increases the flow rate of the compressed air. As a result of this process, a vacuum is created in the suction mouth 3, which vacuum, due to the venturi effect, causes suction in an upward direction to lift the broken yarn end from the weft tube 4.

In one aspect of the invention, the sequence of operation of the pumping assembly is as follows. The compressed air passes inside the first venturi jets 5a through inlets provided in the first venturi jets 5 a. The compressed air leaves the venturi jet 5a at the outlet towards the inside of the suction duct 2, creating a suction effect or vacuum in an upward direction inside the suction mouth 3. The varying diameter profile of the venturi inner tube from one end to the other produces the desired suction effect in the upward direction. Due to this suction effect or vacuum, the end of the broken yarn is picked up from the weft tube 4 and sucked inside the suction mouth 3 into the suction assembly. The sucked cut ends can then be delivered for the splicing operation.

In another embodiment, the second venturi jets 5b may be placed at the more distal end of the suction assembly. A sensor (not shown) may be placed in the suction pipe 2 near the second venturi jet 5b to detect the end of the sucked broken yarn. The sensor position may provide an output when a broken end is detected in the suction tube 2. Based on this output, compressed air may be provided to the second venturi injector 5 b. At the same time, the supply of compressed air to the first venturi injector 5a may be interrupted. Thus, the end of the broken yarn remains inside the suction tube 2 in a controlled manner without unwinding from the weft tube 4. The above sequence is continued as necessary.

Fig. 2 shows a perspective view of the venturi jet 5. Compressed air passes from the inlet through the inside of the venturi jets 5. The venturi jet 5 has a tapering inner contour which clears the compressed air at the outlet of the venturi jet 5 in the upward direction of the weft 4 inside the suction tube 2. This creates suction at the suction mouth 3 and picks up the end of the broken yarn upwards from the weft 4.

In another embodiment of the invention, multiple venturi jets may also be used. The venturi jets used may not be limited to one or two. In one case, the suction pressure due to the compressed air flow is varied in any order by a single or multiple flow control. The timing of providing the multiple flow controls can be varied in any order depending on the pick-up requirements of the end of the cut. Therefore, in order to effectively pick up the yarn and perform the splicing, it may be necessary to maintain the suction pressure.

As an exemplary embodiment, the suction pressure for the first venturi jet 5a is maintained within a suitable operating range, preferably 50mbar to 70mbar, until the end of a broken yarn is picked up/sucked from the weft tube 4 and detected by a sensor located adjacent to the second venturi jet 5 b. Compressed air is then provided to the second venturi injector 5 b. At the same time, the supply of compressed air to the first venturi injector 5a is interrupted. The suction pressure for the second venturi jet 5b is maintained within a suitable operating range, preferably 30mbar to 50mbar, until the sucked broken yarn end is delivered for splicing.

In addition to the venturi jets 5, a number of air jets may be provided around the bottom of the weft 4 to assist in lifting the end of a broken yarn (not shown).

In another non-limiting embodiment, a method for automatically piecing broken yarns in a ring spinning machine is disclosed. The method may comprise sucking the end of the broken yarn from the weft 4 using a suction assembly. The suction assembly may comprise a suction tube 2 having a suction nozzle 3 at the end facing the weft tube 4. The suction tube 2 can be positioned at a predetermined height above the weft 4. At least one venturi eductor 5a may be secured to the suction tube 2, and the venturi eductor 5a may receive compressed air from the pressure supply port. The movement of the compressed air through the constricted section of the venturi jet 5a can generate a vacuum in the suction nozzle 3 to suck the broken yarn end from the weft tube 4 into the suction tube 2.

The above-described automatic piecing unit and the method for automatic piecing of a broken yarn in a ring spinning machine thus provide a reliable solution for picking up a broken yarn end from a weft tube in a cost-effective manner without the need to completely unwind the weft tube 4. The space in the automatic joint unit 1 is also significantly reduced by eliminating the use of a suction motor for the counterweight.

In view of the present disclosure describing the present invention, all changes, modifications and variations that come within the meaning and range of equivalents are to be considered as falling within the scope and spirit of the present invention as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, method and steps described in the specification.

As will be readily appreciated from the present disclosure, processes, machines, devices, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the embodiments described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, methods, or steps.