WO2008101580A1 - Air nozzle assembly having a joining apparatus - Google Patents

Abstract

The present invention relates to a spinning apparatus (5) for producing a thread (36) by means of a circulating air flow, wherein the spinning apparatus (5) has a hollow spinning cone (19) which is arranged in a spinning housing (14, 15) and, in order to generate the circulating air flow, a nozzle block (17) which can be loaded with compressed air, wherein the spinning housing (14, 15) has an expansion chamber (28) which is provided with at least one waste air channel (29), wherein a compressed air source (22) can be connected to the waste air channel (29) for the joining operation, while the nozzle block can be separated from the compressed air supply, as a result of which an air flow which runs along the spinning cone (19) in the direction of the sliver guide (18) is generated in the spinning housing (14, 15), with the result that a suction effect is produced at the inlet opening (35) of the spinning cone (19), by way of which suction effect a thread (36) can be transported through the spinning cone (19) counter to the spinning direction.

Description

Description:

AIR NOZZLE UNIT WITH INJECTION DEVICE

The present invention relates to a spinning device according to the preamble of claim 1.

A spinning device of the type mentioned is known from WO 2005/007948 Al. For piecing a thread, a fiber sliver warped in an upstream drafting system, which is presented via a sliver guide, which also acts as a twist stop, to the inlet opening of a spindle-like thread take-off channel. At the inlet opening, a thread end is provided so that upon entry of the sliver into the thread withdrawal channel, the free fiber ends are looped around the conical head of the thread withdrawal channel by means of a circulating air flow. While the thread is being drawn in, the fibers wrapping around the thread withdrawal channel spirally wrap around the so-called core fibers. The core fibers together with the binder fibers form a new thread.

If, in the spinning device, the spinning process is interrupted due to breakage of the fiber ribbon or the spun yarn, the end of an already spun yarn is guided back through the spinning device against the operational transport direction into the spinning device during the course of the piecing process and submitted to the sliver. As a transport medium for the presentation of the thread end a directed against the transport direction of air flow is used. The supply of air takes place via an integrated into the yarn withdrawal channel injection channel in the thread withdrawal channel empties. The air is generated by a compressed air source connected to the injection channel. During the process of presenting the thread end of the injection channel is pressurized with compressed air, which causes in the yarn withdrawal channel directed towards the drafting suction air flow, which returns the end of the spun yarn to the delivery roller pair of the drafting system.

A disadvantage proves that the production of such a thread withdrawal channel with an integrated injection channel manufacturing technology is very demanding.

Object of the present invention is to provide a spinning device of the type mentioned above, which allows easy feeding of the thread end to continue the spinning process and is inexpensive to produce.

The object is achieved by a device according to the characterizing features of claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

According to claim 1, it is proposed that for the piecing to the exhaust duct a compressed air source can be connected, while the nozzle block is separable from the compressed air supply, whereby in the spinning housing an air flow is generated, which runs along the spinning cone ¹ in the direction of the sliver guide, so that at the inlet opening of the Spinkonus' creates a suction with which a thread through the spinning cone against the spinning direction is transportable. Compared to the prior art, this spinning device has the advantage that an injector, which incorporated elaborately into the spinning cone must be, is not required. Rather, it is sufficient to connect a compressed air source to the expansion space to generate an air flow in the direction of the nozzle block, which generates a suction at the inlet opening of the spinning cone. This suction causes the yarn end located in the spinning cone to be sucked in the direction of this inlet opening, so that the thread end is ready at the beginning of the piecing process.

The invention makes use of the fact that at least one exhaust air duct must be provided to carry out the spinning process in order to be able to discharge the compressed air introduced via the nozzle block to the outside. The simultaneous use of the exhaust duct in the sense of an injector nozzle simplifies the spinning device, making it cheaper to manufacture.

Advantageously, the exhaust duct can be inclined in the direction of the nozzle block. By this simple constructive measure, the incoming compressed air is already aligned in the direction of the spinning cone ¹ . As a result, the emergence of the suction effect at the inlet opening can be promoted and at the same time the occurrence of flow losses can be reduced.

In an advantageous development, the compressed-air source can be switched over in such a way that it pressurizes the exhaust-air duct with compressed air, either to generate the circulating airflow when spinning the nozzle block or else to generate the intake flow for presenting the yarn end. The need for an additional source of compressed air, which is switched only to submit the thread end to continue the spinning process, can be omitted if necessary for the spinning process Compressed air source can be connected via suitable pneumatic lines and valves to the exhaust air duct.

In a preferred embodiment, a control device for controlling the compressed air source can be provided. The control device switches, for example, to interrupt the compressed air supply via pneumatic lines intermediate valves to pressurize the nozzle block with compressed air depending on the operating state during the spinning process and to suppress the compressed air supply to the exhaust duct or in the case of yarn break for the period of presenting a yarn end the exhaust duct with compressed air to apply and to interrupt the compressed air supply to the nozzle block.

In particular, a sensor for detecting a thread may be provided in the region of the inlet opening. Thus, the beginning and the duration of the compressed air supply for presenting the thread end can be controlled in a simple manner. In this way, after a thread break, the switching of a shared compressed air source is maintained only for the actual period of presentation of the thread end. If the thread end is detected, it is switched to the admission of the nozzle block whose compressed air supply has been previously interrupted in the detection of a yarn breakage. This saves time when troubleshooting a thread break, which can increase productivity. In addition, in the case of unsuccessful detection of the thread end via the control device, this situation can be signaled outwards if an intervention by the operating personnel is required.

As an alternative to the sensor arrangement in the interior of the spinning device can be between the pair of output rollers and the Fadenführungs- and twist stop means with a negative pressure

-A- can be arranged acted upon suction tube with a sensor which serves to detect the yarn end. In contrast to the arrangement of the sensor in the interior of the spinning device, in particular the need for installation space for the sensor plays a subordinate role in this embodiment.

Further details of the invention are explained below with reference to an embodiment shown in the drawings.

Show it:

Fig. 1 in front view one with inventive

Air-spinners equipped textile machine;

Figure 2 schematically, in longitudinal section, an air spinning device according to the invention.

Fig. 3 schematically, in longitudinal section, an alternative

Embodiment of the air-spinning device according to FIG. 2.

The air-spinning machine 1 shown in front view in FIG. 1 has a multiplicity of workstations 2 arranged in a row next to one another and a drive unit 13 on at least one end of the air-jet spinning machine.

Each of the spinning stations 2 of the air-spinning machine 1 has a sliver source, for example a sliver can 3, a drafting device 4, an air-spinning device 5, a yarn withdrawal device 6, a yarn cleaner 7 and a thread-changing device 8. The Fadenchangiereinrichtung 8 ensures that the thread produced in the air spinning device 5 wound in intersecting layers on a package 9 becomes. The cross-wound bobbin 9 is held in a creel and is rotated by a reel drive.

As further indicated in FIG. 1, the spinning stations 2 of the air-spinning machine 1 are supplied by an automatically operating operating rotor 10, which, guided on rail 11, 12, can be moved along the spinning stations 2.

In Fig. 2, the air-spinning device 5 according to the invention, the drafting 4 upstream in sliver running direction R and the downstream yarn withdrawal device 6 are shown schematically. The air spinning device 5 is shown in section. As can be seen from FIG. 2, the air-spinning device 5 consists essentially of a two-part outer housing 14, 15, an expansion housing 16, a nozzle block 17, a sliver guide and swirl stop device 18, and a hollow spinning cone 19.

The expansion housing 16 forms in conjunction with the front housing part 14 of the outer housing a front annular space 20 which is connected via a pneumatic line 21 to a pressure source 22 and in conjunction with the rear housing part 15 of the outer housing an expansion space 28. During the expansion space 28 via a Exhaust duct 29 is connected to a machine-wide suction, which is connected to the environment, the annular space 20 is pneumatically connected continuously with Blasluftdüsen 23, which are arranged in the nozzle block 17.

The blowing air nozzles 23 are directed tangentially in the region of the inlet opening 35 of the spinning cone 19 on the head 24 of the spinning cone 19 in such a way that a rotating air flow adjusts to it. The spinning cone 19 is preferably made made of a highly wear-resistant material, such as a technical ceramic material.

The compressed air source 22 is connected via a pneumatic line 30 with the exhaust duct 29 in connection. To control the compressed air supply, the pneumatic lines 21 and 30 via valves 32, 33, 34 controllable. The actuation of the valves 32, 33, 34 takes place by a spinning station own control device 38 which is connected via control lines to the valves.

The process of spinning a thread 36 by means of the spinning device 5 according to the invention is explained below with reference to FIG.

As indicated in Figure 2, the stockpiled in a spinning can 3 sliver 25 passes through on its way to the cheese 9, first the drafting system 4, where it is warped. The drawn sliver 25 is transferred into the area of the inlet opening 27 of the air spinning device 5 via the pair of delivery rollers 26 of the drafting system 4 and is sucked into the air spinning device 5 under the influence of a vacuum flow prevailing there.

Within the air spinning device 5, the fiber sliver 25 passes through the sliver guide and swirl stop device 18 and the nozzle block 17 to the inlet opening 35 of the hollow spinning cone 19 and is drawn into the spinning cone 19 by the thread 36 forming within the spinning cone 19. The illustration in FIG. 2 shows the opening of the sliver guide and twist stop device 18 at its narrowest point. The opening of the sliver guide and swirl stop means 18 has a cross section substantially corresponding to a lying eight, through which the fiber material is supplied. The sliver 25 is in the region of the head of the spinning cone ¹ 19 exposed to the influence of a rotational flow, which is generated by the exiting the nozzle block 17 air flow. To supply the air flow from the compressed air source 22 to the nozzle block 17, the valve 32 is open and the valve 34 to allow during the spinning process, the outflow of air flowing through the nozzle block 17 air flow through the exhaust duct 29 to the outside to the machine-wide suction, while the valve 33, which connects the compressed air source 22 to the exhaust duct 29, is locked.

After leaving the Faserbandführungs- and twist stop means 18, the rear, free ends of the edge fibers of the sliver 25 are exposed to the action of an emerging from the blowing nozzles 23 of the nozzle block 17 air flow that they are lifted or released from the sliver 25. The front ends of the fibers, on the other hand, are not detached, since they have already been captured by binding fibers and introduced into the hollow spinning cone 19. The detached from the sliver 25 free fiber ends are wound by the rotating air flow to the conical head 24 of the spinning cone 19.

As a result of the continuous movement of the sliver 25 in the direction of the sliver R, the rear free end of the fibers is drawn continuously into the hollow spinning cone 19, wherein the edge fibers are helically wound around the core fibers of the sliver 25. The resulting thread 36 is pulled over the thread withdrawal device 6 from the air spinning device 5 and then wound into a cheese 9.

An interruption of the spinning process by the breakage of the sliver 25 or the spun yarn 36 is eliminated by a piecing process. To carry it out is it is necessary to provide the sliver 25 or a yarn end for piecing. For presentation, it is necessary that on the one hand, the sliver 25 is again submitted to the air-spinning device 5, and on the other hand, the spun yarn 36 must be introduced against the direction of sliver R in the spinning cone 19. This is achieved in that the control device 38 of the workstation 2 closes the valves 32 and 34, whereby the compressed air supply of the nozzle block 17 and the outflow of air through the exhaust duct 29 is prevented to the outside. At the same time, the valve 33 is opened in order to pressurize the expansion space 28 with compressed air via the pneumatic line 30 connected to the exhaust air duct 29. Meanwhile, the compressed air supplied through the exhaust air duct 29 escapes through the sliver guide and swirl stop device 18. The inclination of the exhaust air duct 29 generates an air flow directed onto the inlet opening 35 of the spinning cone 19. Due to the Bernoulli principle, a negative pressure occurs at the inlet opening 35, which develops a suction effect in the interior of the spinning cone 19. The suction effect causes the thread 36 to be transported in the direction of the inlet opening 35 of the spinning cone 19. The introduced into the expansion space 28 compressed air escapes through the Fadenführungs- and twist stop means 18th

To ensure that the thread end has been submitted accordingly, the expansion space 28 is pressurized with compressed air for a predeterminable period of time before the valve 33 is closed and the valves 32, 34 are opened again.

Alternatively, in the region of the nozzle block 17 and the inlet opening 35, a sensor 39 may be provided in the annular space 20, which detects the presence of the thread end. The sensor 39 is connected to the control device 38. Becomes detects the presence of the thread end, this information is forwarded to the control device 38. This controls the valves 32, 33, 34 accordingly, in order to switch the compressed air source 22 to the admission of the nozzle block 17 for performing the piecing process and the continuation of the spinning process.

A further embodiment shown in Fig. 3 provides that between the pair of output rollers 26 of the drafting system 4 and the Fadenführungs- and twist stop 18 is acted upon by a vacuum suction pipe 40 is disposed on which a sensor 41 is arranged, by means of which a befindliches in the suction pipe 40 Yarn end is detectable. The suction pipe 40 is subjected to negative pressure, so that the thread emerging from the yarn guide and twist stop device 18 is sucked in. If the thread end passes the sensor 41, the process of presenting is terminated. To control the process, the sensor 41 is also connected to the control device 38 in order to be able to forward the information about the presence of the thread end to the control device 38. To initiate the Anspinnvorganges the thread end of the thread withdrawal device 6 is withdrawn in the transport direction of the thread and at the same time the valves 32, 33, 34 driven accordingly to the compressed air source 22 to the application of the nozzle block 17 to perform the piecing process and the continuation of the spinning process.

Claims

Claims: 1. spinning device (5) for producing a thread (36) by means of a circulating air flow, wherein the spinning device (5) in a spinning housing (14, 15) arranged hollow spinning cone (19) and for generating the circulating air flow a pressurizable air nozzle block (17), that the spinning housing (14, 15) has an expansion space (28) which is provided with at least one exhaust air duct (29), characterized, in that for the piecing operation to the exhaust air duct (29) a compressed air source (22) can be connected while the nozzle block is separable from the compressed air supply, whereby an air flow is generated in the spin casing (14, 15) along the spinning cone (19) in the direction on the sliver guide (18) extends, so that at the inlet opening (35) of the spin cone ¹ (19) creates a suction, with which a thread (36) through the spinning cone (19) against the spinning direction is transportable. 2. spinning device (5) according to claim 1, characterized in that the exhaust air duct (29) in the direction of the nozzle block (17) is inclined. 3. spinning device (5) according to any one of claims 1 or 2, characterized in that the compressed air source (22) is switchable such that they either for generating the circulating air flow for spinning the nozzle block (17), or for generating the intake flow to Submitting the Thread end of the discharge duct (29) acted upon with compressed air 4. spinning device (5) according to one of claims 1 to 3, characterized in that a control device (38) for controlling the compressed air source (22) is provided. 5. spinning device (5) according to one of claims 1 to 4, characterized in that in the region of the inlet opening (35) a sensor (39) is arranged for thread detection. 6. spinning device (5) according to one of claims 1 to 4, characterized in that between the pair of output rollers (26) and the Fadenführungs- and twist stop means (18) is acted upon with a vacuum suction pipe (40) with a sensor (41) is arranged.