JP2016003143A - Method and apparatus for controlling negative pressure on thread catching or cleaning nozzle of work unit of textile machine which produces winding packages - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for at least relieving a problem found in the prior art of the work unit of a textile machine for producing a winding package, and moreover ideally realizing a more inexpensive embodiment of the work unit.SOLUTION: At least during the initial phase of a startup period of the winding process after forming a thread connection between the upper thread and the lower thread into one thread (30), no negative pressure is applied to the thread catching nozzle or cleaning nozzle (23), or only such a small negative pressure is applied to the thread catching nozzle or cleaning nozzle (23) that the nozzle (23) does not suck in the thread (30) during the startup period.

Description

  The present invention relates to a method and an apparatus for controlling the negative pressure in a yarn catching nozzle or clearer nozzle of a working unit of a textile machine producing a winding package.

  A textile machine that manufactures a hoisting package is composed of a plurality of identical working units, each producing one hoisting package, and each working unit includes a central device for the textile machine, such as a power supply Power is supplied. Such a textile machine, in particular, rewinds a plurality of spinning cups with a relatively small volume into one winding package with much more yarn material, in particular into a twill winding package, where the lower yarn is each spinning This is an auto-winding machine from the cup. However, the present invention can also be applied to a rewinding machine, in which the lower yarn comes out from the spinning device.

Each of the work units on which the present invention is based is a yarn joining device for joining an upper yarn in a winding package to a lower yarn to form a single yarn, and subsequently winding the yarn into a winding package, typically Has a splicer or knotter. The work unit further comprises a yarn catch nozzle or clearer nozzle, i.e. a nozzle that is responsible for at least one or both of the following tasks:
a) When the yarn breaks, in order to prevent winding into a so-called package, in particular in an autowinding machine, the lower yarn is sucked in downstream of the yarn catching nozzle or clearer nozzle, thereby fixing the position of the lower yarn (yarn catching) function);
b) Remove loose components such as dust, dirt, lint and extraneous fibers from the yarn traveling by the side (cleaning function).

  In order to realize this function, a negative pressure is applied to the yarn catching nozzle or the clearer nozzle at least during the yarn joining process. For example, a thread catching nozzle or clearer nozzle in a relatively simple textile machine is fixed to a negative pressure beam that extends over the entire textile machine, so that a negative pressure is always applied to the whole textile machine except during an outage. It has been. In contrast, in relatively complex textile machines, the negative pressure at the yarn catching nozzle or clearer nozzle is at least reduced during the yarn joining process.

  Regarding the latter, DE 10 2005 001 093 A1 proposes connecting a yarn catching nozzle or a clearer nozzle to a negative pressure beam via an air deflector. The air deflector has on the one hand a connecting pipe piece for the yarn catching nozzle or the clearer nozzle and on the other hand a closable pressure relief pipe piece with a larger cross section than the connecting pipe piece. ing. If a yarn joint is to be formed, the suction nozzle first winds up the upper thread and finds it in the package, and then inserts the upper thread into the yarn joining device. At that time, the suction nozzle rotates. The suction nozzle, the pressure relief tube piece and the rotational movement are structurally realized so that the suction nozzle closes the pressure relief tube piece during the winding process, but opens the pressure relief piece during the yarn joining process. . As a result, a total negative pressure is applied to the yarn catching nozzle or clearer nozzle during the winding process, however, during the yarn joining process, the negative pressure is released by the released pressure relief piece.

  After the yarn joining process is finished, the winding process needs to be resumed. For this purpose, the winding package is first rotated again at maximum rotational speed. The stage from when the yarn joining is completely completed until reaching the winding process performed at the maximum speed is referred to as a rising period, whereas the winding process performed at the maximum speed is simply referred to as the winding process here. Or a winding operation.

  During the start-up period, the thread has a lower thread tension compared to the situation during the winding process, which can cause the thread to be sucked into the thread catching nozzle or clearer nozzle where negative pressure is applied. is there. That kind of suction is always first performed in the form of a thread loop, and if the loop continues to maintain its shape, the thread loop will rise in the course of a further rise period and the thread will catch the thread again. When pulled out of the nozzle or clearer nozzle, it can be unwound at least easily enough.

  However, due to the prevailing suction flow in the yarn catching nozzle or clearer nozzle, the yarn loop may rotate and the legs of the yarn loop may be entangled with each other. These legs may become untwisted by being twisted and caught with each other, and if they are further rotated and entangled with each other, there is a risk of forming an unmeltable mass. On the contrary, in some cases, the formation of this lump may cause the yarn catching nozzle or the clearer nozzle to be blocked, and if such a blockage occurs, the yarn may be broken in a further rising period. Also, even if the lumped yarn can be pulled out again from the yarn catching nozzle or clearer nozzle in a further rise period, such lumps are not yarn portions that meet the quality requirements of subsequent fiber processing steps. On the contrary, if the mass is subsequently unwound and wound up into a winding package, a poor quality winding package is produced.

  When the yarn catching nozzle or clearer nozzle sucks in the yarn during the rise period, the yarn catching nozzle or clearer nozzle sucks the yarn in the form of a yarn loop and keeps the yarn loop until it is pulled out further in the rise period. In order to ensure that it continues, the prior art uses a nozzle in which the area opposite the yarn has a special shape called the bone-shaped shape as shown in FIG. . Due to the narrowed portion that is formed on the side of the nozzle opening on the yarn side and continues to the inside of the nozzle while being reduced, a stronger suction flow is generated in the upper and lower regions than in the center, This suction flow sufficiently ensures the suction of the yarn in the loop shape and the maintenance of the loop.

  However, this shape has additional disadvantages in addition to the increased structural costs when compared to a simple circular cross section. In other words, since the nozzle cross section is narrowed, this further increases the risk of the nozzle being blocked. However, the nozzle opening and the subsequent relatively narrow shape inside the nozzle also makes it more difficult to clean the nozzle, for example with a brush.

  In addition to the use of bone-shaped thread catching nozzles or clearer nozzles having the above-mentioned drawbacks during the rise period, further problems may arise during the rise period. Such problems particularly include thread breakage when the upper thread is still in the suction area of the thread catching nozzle or clearer nozzle.

  When the yarn breaks, this is usually detected by a yarn monitoring device, for example a yarn clearer. The yarn clearer stops the movement of the winding package, and in the subsequent cutting process and yarn joining process, removes the defective yarn portion and returns the yarn to an integrated state. During the winding process, the upper thread is always first completely wound on the winding package by the residual rotation of the winding package, and the upper thread can be picked up again at a defined position in the winding package.

However, depending on the position of the yarn break, part of the upper thread may be part of the winding package due to the relatively weak residual rotation of the winding package and / or due to the relatively low thread tension during the rising period. There is a possibility that a state where the yarn is sucked into the yarn catching nozzle or the clearer nozzle at the time of stoppage may occur. When attempting to pick up the upper thread again, the winding package is rotated in the reverse direction, so in that situation the thread catching nozzle or clearer nozzle draws more upper thread. This causes the following problems in particular.
a) Closure of the yarn catching nozzle or clearer nozzle: The yarn is piled up during suction, and finally the nozzle is closed. This problem can only be solved manually at least today and the work unit must also be stopped.
b) Formation of double yarn: Since the end of the upper yarn is in the yarn catching nozzle or the clearer nozzle, the end of the upper yarn cannot be found in the winding package. However, the suction nozzle used there for picking up the upper thread can possibly pick up the loop of the upper thread and thereby form a so-called double thread. As a result, in some cases, there is a possibility that the yarn joining process with the lower yarn will fail. However, even if the yarn joining is successful, that is, when the lower yarn is joined to the double upper yarn and the end of the upper yarn can be pulled out from the yarn catching nozzle or clearer nozzle Even so, the double upper thread extending over a certain length of the thread is then wound into a wound package, resulting in a wound package of insufficient quality.

  In the thread break just described, the yarn catching nozzle or the clearer nozzle often sucks the end of the upper thread, particularly when the so-called yarn splice breaks. There is a risk of further induction by negative pressure applied to the nozzle or clearer nozzle. The rupture of the yarn joining portion refers to a case where the yarn joining portion is implemented as a so-called yarn piecing portion, but the yarn piecing portion is not maintained, that is, a case where the yarn joining portion is broken again. In that case, the problem described above usually occurs as follows.

  In general, the yarn catching nozzle or the clearer nozzle is attached to the rear stage of the yarn joining device when viewed in the direction of yarn travel. In the rising period, the yarn joining portion is conveyed in the direction of the yarn catching nozzle or the clearer nozzle and passes in front of the nozzle. At that time, the negative pressure applied to the yarn catching nozzle or the clearer nozzle exerts a sucking action on the yarn, and the yarn is sucked as described above in a normal case. However, in any case, this suction action puts a tensile load on the yarn, and at that time, the weak portion of the yarn may be torn. Sometimes splices are not formed cleanly, such splices should not adversely affect subsequent work steps performed using the winding package, but nevertheless are such weak It may represent a point and may break when approaching the yarn catching nozzle or clearer nozzle. However, the thread catching nozzle or the clearer nozzle may be raised when the yarn splice breaks before or within the suction area of the thread catching nozzle or the clearer nozzle, which is so induced or caused by other factors. There is a possibility of sucking the yarn, which may cause the problems described above.

  The problem just described with respect to the breakage of the spliced part can basically occur in other thread joining methods as well. As far as this is concerned, it also relates to knotters. Therefore, in the following, when referring to yarn splices and splicing of splices, it refers to all yarn splicing and splicing of splicing splices, and so to the extent that The same applies to all yarn joining methods.

DE10 2005 001 093 A1

  Accordingly, it is an object of the present invention to provide a method and apparatus that at least alleviates the above-mentioned problems in the working unit of a textile machine that manufactures a hoist package, but ideally realizes a less expensive embodiment of the working unit. It is.

  The problem is a method for controlling the negative pressure in a yarn catching nozzle or clearer nozzle of a textile machine for producing a winding package, in particular an automatic winding machine working unit, wherein the working unit is out of the winding package. In a method having a yarn joining device for joining a yarn to a lower yarn to be wound on a winding package, at least a yarn joining portion is formed between the upper yarn and the lower yarn to form one yarn During the first stage of the rising period of the subsequent winding process, no negative pressure is applied to the yarn catching nozzle or clearer nozzle, or the yarn catching nozzle or clearer nozzle does not suck the yarn during the rising period. It is solved by applying only a low negative pressure.

  However, this problem is a device for controlling the negative pressure in a yarn catching nozzle or clearer nozzle of a textile machine for manufacturing a winding package, in particular an autowinding machine, wherein the working unit is out of the winding package. In a device having a yarn joining device for joining a yarn to a lower yarn to be wound on a winding package, at least a yarn joining portion is formed between the upper yarn and the lower yarn to form one yarn During the first stage of the rising period of the subsequent winding process, no negative pressure is applied to the yarn catching nozzle or clearer nozzle, or the yarn catching nozzle or clearer nozzle does not suck the yarn during the rising period. This can also be solved by performing control that applies only a low negative pressure.

In accordance with the present invention, it has been found that many of the above-described problems are at least partially due to excessively high negative pressure applied to the yarn catching nozzle or the clearer nozzle during the rise period. . For the above reasons of the thread catching function or the cleaning function, a sufficiently high negative pressure is required during the winding operation, whereas a high negative pressure may have a negative effect at least during the first phase of the rising period. I understood. By blocking the negative pressure completely or at least reducing it to such an extent that the yarn is no longer drawn into the yarn catch nozzle or clearer nozzle during that stage, at least partly Brought about.
a) Reduction of thread breakage: During the phase of reducing or blocking negative pressure, there is little or no suction force acting on the yarn, thus reducing the tension on the yarn. The risk of thread breakage and in particular the risk of tearing of the splices is reduced. Typically, the newly formed seam has already passed through the thread catching nozzle or clearer nozzle at the end of this stage, so that even if all negative pressure is subsequently applied to the thread catching nozzle or clearer nozzle again, Since the negative pressure no longer acts directly on the piecing part at least, the risk of the piecing part breaking is thus reduced.
b) Reduced thread catch nozzle or clearer nozzle blockage and reduced double thread formation: In particular, since the thread is never drawn into the thread catch nozzle or clearer nozzle during the entire rise period, Later, the upper thread is not sucked, and therefore the problems of thread catching nozzle or clearer nozzle clogging or double thread formation described above associated with that kind of sucking are avoided.
c) Realization of a relatively simple shape of the yarn catching nozzle or the clearer nozzle: since the suction of the yarn no longer occurs during the rise period, it is conventionally necessary to maintain the sucked-in yarn loop as that kind of yarn loop Disappear. That is, for example, it is not necessary to prevent twisting of the leg portion of the loop. Accordingly, it is possible to use a shape different from the bone shape of the yarn catching nozzle or the clearer nozzle, which has been conventionally required, for example, a simple circular shape can be used. This not only reduces the manufacturing costs of the nozzles, as already mentioned above, but also reduces the risk of contamination and blockage of the nozzles and facilitates cleaning of the nozzles, for example using brushes.

  Basically, at the start of the rise period, the thread catching nozzle or clearer nozzle sucks at full negative pressure until a thread tension is formed that is sufficient for the thread to no longer be sucked. It is sufficient to block or reduce the negative pressure at the capture nozzle or clearer nozzle. However, it is also possible to shut off or reduce the negative pressure over the entire rise period, for example in order to avoid the use of a thread tension sensor and to simplify the control.

  In the simplest case, the negative pressure at the yarn catching nozzle or clearer nozzle can simply be interrupted throughout the first phase of the rise period, and then the full negative pressure can be applied to the yarn catching nozzle or clearer nozzle. However, while the negative pressure is shut off, the yarn catching nozzle or the clearer nozzle cannot realize its function in particular, so a value slightly lower than the negative pressure value at which the yarn is sucked is always formed. In addition, it may be desirable to sequentially increase the negative pressure during this first stage. Such an increase can be controlled depending on the increase in yarn tension, but this also requires monitoring of the yarn tension. However, in a relatively simple embodiment, there is a rising scheme that can increase negative pressure at a particular stage, for example, at a particular point in time that can be set in relation to the total duration of the rise period as needed. It can also be defined from a series of tests.

  Typically, a yarn catch nozzle or clearer nozzle is connected to a negative pressure beam that extends throughout the textile machine. The control of the negative pressure in this case can be performed by connection via an air deflector as described in the opening paragraph known from DE10 2005 001 093 A1, for example. However, since the open pressure relief piece of such an air deflector leads to a loss of negative pressure and an increase in the required energy, it is used directly in the connection and by means of a valve that directly adjusts the cross-sectional area of the connection. It may be preferable to control the negative pressure. This can be done, for example, by a disk or rotary diaphragm that is well known from the prior art and can enter the cross section of the connection. In this case, when the negative pressure is shut off at the yarn catching nozzle or the clearer nozzle, no negative pressure loss occurs, so that energy at that stage is saved.

  In recent years, a rotary diaphragm for adjusting negative pressures in a plurality of negative pressure nozzles in common by a single servo motor has also been proposed (see in particular EP 2 107 026 A2). Such a multi-valve can also be used advantageously in the context of the present invention. In addition to the negative pressure at the yarn catching nozzle or the clearer nozzle, the multi-valve adjusts the negative pressure at the suction nozzle as mentioned at the beginning. This is because the two components work closely together, for example in the yarn joining process, so that a common negative pressure adjustment is achieved.

  All the configurations described above belong to the present invention.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings and some variations thereof. In all the drawings, the same components are denoted by the same reference numerals.

Figure 2 shows a prior art yarn catch nozzle or clearer nozzle having a bone-shaped shape. FIG. 3 shows a side view of a working unit of a textile machine for producing a traverse package having a yarn catching nozzle or a clearer nozzle connected to a negative pressure cross beam via an air deflector during winding operation. FIG. 3 shows a state of the work unit shown in FIG. 2, particularly a yarn catching nozzle or a clearer nozzle, when winding is interrupted.

  FIG. 1 shows a prior art thread catching nozzle or clearer nozzle 123 having a bone shaped portion 120 in the area of the nozzle opening. That is, the nozzle opening is covered in the region 124 and is open only in the region 122 defined by the line of the bone-shaped part 120. A part of this lateral constriction of the open nozzle opening, denoted by reference numeral 121, continues inside the yarn catching nozzle or clearer nozzle. As mentioned above, this shape ensures yarn suction in a loop shape that continues to be maintained during the suction time.

  Also visible in DE 10 2005 001 093 A1, and in that publication, which is FIG. 1, FIG. 2 shows a thread catch connected to a negative pressure beam 32 via an air deflector 27 during winding operation. A side view of the working unit of a textile machine, here an automatic traversing machine 1, having a nozzle or clearer nozzle 23 for producing a traversing package is shown. This type of automatic traversing machine 1 has a plurality of work units 2 of the same type between end frames (not shown).

The mode of operation of such a device is well known from the prior art and is described in detail, for example, in DE 10 2005 001 093 A1, and further in DE 198 585 48 A1. Therefore, only the description of the reference numerals is described here.
Automatic traversing machine 1; work unit 2; replenishing device 3 in the form of a bobbin and wound tube transport system; cup feeding section 4; reversible storage section 5; transverse transport section 6; 8; Spinning cup 9; Feeding position 10 of spinning cup 9; Traverse package 11; Suction nozzle 12 capable of applying negative pressure; Yarn joining device 13; Yarn tensioner 14; Yarn clearer 15 provided with yarn cutting device 17 Waxing device 16; yarn tension sensor 20; traverse package conveying device 21; lower yarn sensor 22; yarn catching nozzle or clearer nozzle 23 connected to negative pressure cross beam 32 through air deflector 27; Winding device 24 with package frame 18 movably supported about the center; Yarn twill with finger yarn guide 29 As well as a packaging drive / drive drum 26; a gripper tube 25 capable of applying negative pressure; a thread 30; a negative pressure beam 32 connected to a negative pressure source 33; an empty pipe 34; a thread catching nozzle or A connection pipe piece 35 for the clearer nozzle 23 and a pressure relief pipe piece 36 of the air deflector 27.

  As described at the beginning, the negative pressure in the yarn catching nozzle or clearer nozzle 23 is adjusted by opening and closing the pressure release pipe piece 36 by the suction nozzle 12. In the position of the suction nozzle 12 shown in FIG. 2 during the winding operation, the suction nozzle 12 completely closes the pressure release pipe piece 36, and in order to realize the yarn catching function and the cleaning function, A total negative pressure is applied to the capture nozzle or clearer nozzle 23.

  It can be seen in DE 10 2005 001 093 A1, and in that publication, which is FIG. 2, FIG. 3 shows the state when the winding of the work unit shown in FIG. 2 is interrupted, in particular the yarn catching nozzle or the clearer nozzle 23. The state is shown. Here, the suction nozzle 12 is swung counterclockwise, and the pressure relief pipe piece 36 of the air deflector 27 is completely opened. Accordingly, the negative pressure applied to the connecting pipe piece 35 following the yarn catching nozzle or the clearer nozzle 23 is sufficiently reduced. That is, the yarn catching nozzle or clearer nozzle 23 does not perform suction at all.

  Depending on the position of the suction nozzle 12 in the vicinity of the pressure relief pipe piece 36, it is possible to adjust the intermediate state and thus the reduced negative pressure at the yarn catching nozzle or clearer nozzle 23.

  In that embodiment, the suction nozzle 12 is sufficiently separated from the pressure relief pipe piece 36 during the first stage of the rise period to adjust the desired negative pressure reduction at the yarn catch nozzle or clearer nozzle 23, The present invention is implemented. When the negative pressure is actually completely cut off, the suction nozzle 12 can be moved to the position shown in FIG. 3, for example.

  However, as mentioned at the beginning, the reduction of the negative pressure by the pressure-release pipe piece just described brings at least the disadvantage of requiring relatively high energy requirements. In addition, the negative pressure cannot be completely cut off, and precise control of the negative pressure is difficult. Therefore, it is considered preferable to provide a valve that directly acts on the flow path of the yarn catching nozzle or the clearer nozzle 23. Such valves are well known from the prior art and, therefore, only two relatively simple embodiments as well as a relatively new multi-valve as described at the beginning will be mentioned here.

  That is, DE 17 85 293 C3 first shows a simple shielding principle in FIG. 4, that is, the nozzle 16 is shielded by the cover 17 so that the negative pressure in the nozzle 16 is blocked. FIG. 1 of this publication also shows the principle of controlling the negative pressure at the suction nozzle 14 by allowing a rotary throttle 18 having a through opening to enter the suction channel 4 leading to the suction nozzle 14. Yes.

  As stated at the beginning, EP 2 107 026 A2 discloses a multi-valve formed as a rotary throttle 33, the structure of which is detailed in FIGS. 2 to 4 of the publication. And the function of the multi-valve is described in detail in FIGS. There, a thread catching nozzle or a clearer nozzle can be connected to the opening 32a of the multi-valve, while if the common control with the suction nozzle described at the beginning is performed, the opening 32c is Control can be implemented via

  In particular, the solution using the rotary throttles of DE 17 85 293 C3 and EP 2 107 026 A2 (but basically also can be implemented as a disc throttle) is the negative pressure in the yarn catching nozzle or the clearer nozzle. A very accurate and precise step-wise adjustment is achieved and is therefore particularly suitable for the implementation of the present invention.

  In the above, the method and apparatus according to the present invention for controlling the negative pressure in the yarn catching nozzle or clearer nozzle of the working unit of the textile machine producing the winding package has been described based on selected embodiments. Then, other variations and combinations of the above-described special embodiments can be conceived. That is, other single valves and multi-valves known from the prior art for adjusting the negative pressure can also be used advantageously in the yarn catching nozzle or the clearer nozzle separately or together with another negative pressure nozzle.

  For the sake of completeness, it should be noted that an infinitive does not exclude that a plurality of constituent members represented by the infinitive may be provided. Similarly, the description of a particular component does not necessarily mean that its function cannot be divided into alternative components, or that the functions of a plurality of the aforementioned components cannot be integrated into a single component. It is not.

Claims (7)

A method for controlling negative pressure in a yarn machine or clearer nozzle (23) of a textile machine (1) for producing a winding package (11), in particular a working unit (2) of an autowinding machine, comprising:
The work unit (2) has a yarn joining device (13) for joining the upper yarn coming out of the winding package (11) to the lower yarn to be wound on the winding package (11). In the method
At least during the first stage of the start-up period of the winding process after forming a yarn joint between the upper yarn and the lower yarn to form one yarn (30), the yarn catching nozzle or the clearer No negative pressure is applied to the nozzle (23), or only a low negative pressure is applied so that the yarn catching nozzle or the clearer nozzle (23) does not suck the yarn (30) during the rising period. And the method.   The method of claim 1, wherein the first stage of the rising period spans the entire rising period.   The negative pressure applied to the yarn catching nozzle or clearer nozzle (23) during the first stage of the rising period is sequentially increased until the negative pressure reaches a target value after the end of the rising period. The method according to claim 1, wherein the method is raised. The yarn catching nozzle or clearer nozzle (23) is connected to a negative pressure string (32) extending throughout the textile machine (1),
The negative pressure applied to the yarn catching nozzle or clearer nozzle (23) is controlled by a change in a cross-sectional area of a connection portion between the yarn catching nozzle or clearer nozzle (23) and the negative pressure cross beam (32). Item 3. The method according to Item 1 or 2.   The method according to claim 4, wherein the change in the cross-sectional area is performed by a diaphragm, in particular by a rotary diaphragm.   In addition to the cross-sectional area of the connection between the yarn catching nozzle or the clearer nozzle (23) and the negative pressure cross beam (32), other components of the work unit (2), in particular the work, 6. The method according to claim 5, wherein the cross-sectional area of the connection between the suction nozzle (12) of the unit (2) and the negative pressure beam (32) is also varied. An apparatus for controlling negative pressure in a yarn catching nozzle or clearer nozzle (23) of a textile machine (1) for producing a winding package (11), in particular a working unit (2) of an autowinding machine,
The work unit (2) has a yarn joining device (13) for joining the upper yarn coming out of the winding package (11) to the lower yarn to be wound on the winding package (11). In the device
At least during the first stage of the start-up period of the winding process after forming a yarn joint between the upper yarn and the lower yarn to form one yarn (30), the yarn catching nozzle or the clearer Control is performed so that a negative pressure is not applied to the nozzle (23) or a low negative pressure is applied so that the yarn catching nozzle or the clearer nozzle (23) does not suck the yarn (30) during the rising period. A device characterized by that.

Images