EP0701014B1 - Procedure for piecing yarn in a device, for producing a twisted yarn in an integrated spinning and twisting process, as well as a device to carry out the procedure - Google Patents

Description

The invention relates to a method for piecing a thread in a device for producing a thread in an integrated spinning-twisting process, the device having the features from the preamble of claim 1.

The invention further relates to an apparatus for performing this method.

It is known to produce a twine in such a way that in a first operation spinning threads are produced by means of suitable spinning units, which in a subsequent one Working process by means of twisting devices, for example double-wire twisting devices, to be further processed into a twisting.

From the documents DD 78 710, which forms the closest prior art, and FR-A-2 354 403, devices are also known in which by means of two adjacent, i.e. side by side or one above the other, individual spinning units which are produced directly after the Spiders are merged and twisted.

The post-published DE 4331801 C1 describes a device for producing a thread in an integrated spinning-twisting process, this device having at least one drivable spindle rotor which is rotatably mounted in a machine frame and a spindle hollow axis to which a thread guide channel is guided, which is guided essentially radially outwards for a thread, which, after emerging from the thread guide channel with balloon formation, is guided to a centering point lying in the extension of the spindle hollow axis and then withdrawn. The device also has a device for feeding dissolved fiber material into the space defined by the thread balloon. Within the space defined by the thread balloon above the spindle rotor, two rotor spinning units are arranged next to each other and symmetrically to the hollow spindle axis with spinning rotors open to the top, to which the fiber material is fed and from which the generated spinning threads are removed and deflected in their direction of movement by 180 ° and jointly in the spindle hollow axis are inserted.

A very important process in such a device is the piecing process when the device is started for the first time.

Known piecing devices for the production of a single filament by means of a rotor spinning unit work with an auxiliary thread or the end of the spun thread, which is fed with the aid of a suitable automatic system through the central filament channel to the spinning rotor until its end touches the fibers in the rotor groove spins in order to be pulled back by a reversal in the automatic system, whereby the continuous spinning process is initiated and continues.

A forward and backward movement of the piecing thread piece is therefore necessary for the usual piecing technique. This includes extensive mechanics and especially a precisely working reversing device.

If a conical bobbin, in particular a conical bobbin, is used as the take-up spool for the finished rotor spinning thread, difficulties can arise during the piecing process because the peripheral speed of a take-off roller upstream of the take-up spool, which is also temporarily driven in reverse during the piecing process, is not without can further be brought into line with the thread winding speed or thread winding speed at the package. In order to remedy these difficulties, it is known from DE 28 50 729 C2 (= GB-A-2 035 395) to assign an additional storage element to the usual piecing mechanics, with which a certain thread length between the package and the spinning rotor during the piecing process can be saved in the form of a thread loop in order to achieve perfect piecing even in the case of conical bobbins.

The invention has for its object to provide a method and a device by means of which the piecing process can be carried out in a simple manner without extensive mechanics and without its own reversing device in a device for producing a thread in an integrated spinning-twisting process of the type described above .

This object is achieved procedurally with the features from the characterizing part of patent claim 1. An advantageous development of the method is described in patent claim 2.

A device for performing the method according to the invention is the subject of claim 3. Advantageous further developments of this device are described in subclaims 4 to 15.

The invention is based on the basic idea of initiating the piecing process in such a way that two piecing thread strands are threaded into the usual thread path of the double-wire twisting spindle for piecing. This can be done manually with the help of a mechanical threader or by known methods and devices of pneumatic threading. Each of the two piecing thread strands threaded in this way is then guided from above from the upper end of the hollow spindle axis over a partial circumference of a guide element and via a storage element into the respective spinning rotor. A thread loop of a predetermined length is stored in the storage element. This makes it possible that when the spinning rotor starts up, this stored thread loop is first drawn out of the storage element into the spinning rotor. The thread loop is finally released by the storage element and after piecing the piecing thread strand together with the pieced spinning thread can be guided out of the spinning rotor and reversed over the guide element to the hollow spindle axis.

It has been shown that the method according to the invention can be carried out in a very simple manner with a piecing device by using a freely rotating storage wheel as the storage element, which has a thread running groove and therein a clamping hook for fixing and clamping the thread loop mentioned above. How explained in more detail below on the basis of an exemplary embodiment, with such an arrangement, only the thread loop needs to be guided over part of the circumference of the storage wheel and hooked into the clamping hook. When the piecing thread strand is drawn into the spinning rotor, the thread loop is drawn in and the storage wheel rotates until the thread loop slides out of the clamping hook pointing downward after a certain rotation. After the thread loop is released, the piecing thread strand lies on the guide element, which is designed, for example, as a freely rotating deflection roller, through which the piecing thread strand and spinning thread are fed to the spindle hollow axis after the direction is reversed. The filaments unite in the hollow spindle axis and the twisting process is initiated.

By clamping the thread loop, not only is the limit for the apex of the thread loop reached when storing, but there is an additional advantageous effect. During the piecing process, the thread end protruding into the spinning rotor is immediately given a thread twist. This rotation would continue via the thread strand introduced up to the central entry point into the twisted part, that is to say the hollow spindle axis of the spinning twisting device. At this point, the twist energy would already twist the two spinning threads coming from a spinning rotor, which is undesirable, since this hinders the twisting twist that occurs later. The clamping point during storage prevents this rotation from running through.

An exemplary embodiment of the method according to the invention on a device for producing a thread in an integrated spinning-twisting process by means of a piecing device according to the invention is explained in more detail below with reference to the accompanying drawings.

• Figur 1 in einer Schnittansicht eine Doppeldraht-Zwirnspindel mit darin integrierten Spinnaggregaten in Form von Spinnrotoren ohne eine Anspinneinrichtung;
• Figur 2 eine Teilschnittdarstellung der oberen Hälfte der Einrichtung nach Figur 1 mit einer oberhalb der Spinnrotoren angeordneten Anspinneinrichtung;
• Figur 3 in einer leicht vergrößerten perspektivischen Teildarstellung eine der Anspinneinrichtungen nach Figur 2;
• Figuren 4A bis 4D in vier aufeinanderfolgenden Phasen in schematischer Darstellung den Lauf des Anspinnfadenstranges durch eine der Anspinneinrichtungen nach Figur 2 und 3 während des Anspinnens;
• Figuren 5A und 5B in zwei aufeinanderfolgenden Phasen in schematischer Darstellung den Lauf des Anspinnfadenstranges durch eine Anspinneinrichtung, bei der den beiden Spinnrotoren ein gemeinsames Speicherrad zugeordnet ist;
• Figur 6 den Lauf des Anspinnfadenstranges durch eine Anspinneinrichtung, bei der Umlenkrad und Speicherrad koaxial zueinander angeordnet sind;
• Figur 7 einen Axialschnitt durch die Anspinneinrichtung nach Figur 6.

The drawings show:

• Figure 1 is a sectional view of a double-wire twisting spindle with integrated spinning units in the form of spinning rotors without a piecing device;
• FIG. 2 shows a partial sectional view of the upper half of the device according to FIG. 1 with a piecing device arranged above the spinning rotors;
• 3 shows a slightly enlarged perspective partial view of one of the piecing devices according to FIG. 2;
• FIGS. 4A to 4D in four successive phases in a schematic representation of the run of the piecing thread strand through one of the piecing devices according to FIGS. 2 and 3 during piecing;
• Figures 5A and 5B in two successive phases in a schematic representation of the run of the piecing strand through a piecing device, in which a common storage wheel is assigned to the two spinning rotors;
• 6 shows the course of the piecing thread strand through a piecing device, with the deflection wheel and Storage wheel are arranged coaxially to each other;
• FIG. 7 shows an axial section through the piecing device according to FIG. 6.

A device for producing a thread in an integrated spinning-twisting process, which is constructed as a double-wire twisting spindle, is initially described below with reference to FIG. 1, the parts of the device relating to piecing being initially omitted.

In the double-wire twisting spindle according to FIG. 1, a hollow shaft 23 is rotatably mounted in a machine frame represented by a spindle bank 21 by means of a bearing block 22, the outer, that is to say the lower end of which can be connected to a suction air source (not shown). The hollow shaft 23, which can be driven by a tangential drive belt (not shown) and forms part of the spindle rotor, carries a radially outwardly directed spindle rotor disk 26 with a substantially radially guided thread guide channel 27. A balloon limiter pot 7 is fastened to the outer circumference of the spindle rotor disk 26, in the wall thereof a thread guide tube 3 is guided upwards, which connects with its lower end to the thread guide channel 27 and from whose upper end the thread F3 emerges towards the centering point 37. In the inner end of the thread guide channel 27 opens as part of the spindle hollow axis a bent at its lower end thread guide tube 29 which is inserted into the hollow shaft 23 that 29 air channels 30 remain free between the hollow shaft and the thread guide tube. The spindle rotor is now overall essentially formed by the following elements: hollow shaft 23, spindle rotor disk 26, balloon limiter pot 7 with thread guide tube 3 and thread guide tube 29.

On the upper end of the hollow shaft 23, with the interposition of suitable bearings, a substantially closed inner housing 12 is secured, which is secured against rotation via permanent magnet pairs 51, 52 and which essentially has the shape of a cylinder with a bottom 12.1, an outer wall 12.2 and a cover 12.3 .

Within this inner housing 12, two rotor spinning devices R1 and R2 are accommodated, whose spinning rotors 1 and 2 point upwards and are driven by means of a drive belt 9 from a motor not shown in FIG. The fiber material feed pipes 5 and 6 which open into the spinning rotors 1 and 2 are guided through the cover 12.3. Furthermore, thread take-off tubes 31 and 32 are guided through the cover 12.3 coaxially above the spinning rotor axes, through which the spinning threads F1 and F2 produced in the spinning rotors 1 and 2 are drawn off before they run in through the upper inlet end 11a of the downwardly directed hollow spindle axis 11, which opens with the interposition of, for example, an annular gap seal 33 in the upper end of the thread guide tube 29.

At the inner end of the hollow shaft 23 there are air channels 39, 40 which open into the interior of the inner housing 12 in the area of the spinning rotors 1 and 2. The outer end of the hollow shaft 23 is connected in a manner not shown to a suction source, so that over the hollow shaft 23 and the air channels 39, 40 a negative pressure is generated in the interior of the inner housing 12, which acts in the fiber material feed tubes 5 and 6 and causes the fiber feed to the spinning rotors 1 and 2.

The inner housing 12 is surrounded by an outer housing 34 which carries a removable cover 35, in which the permanent magnet pairs 51, 52, which cooperate with the corresponding counter magnets in the cover 12.3 of the inner housing, are arranged, as a result of which a contactless holding device between the inner housing 12 with the ones fixed therein arranged components and the outer housing 34 is formed. On the top of the cover 35 of the outer housing 34 there is a thread outlet opening 37 as a centering point lying coaxially to the spindle hollow axis, to which a take-off mechanism for the thread F3 is connected.

The power supply to the drive motor for the rotor spinning devices R1 and R2 takes place through the spindle rotor disk 26 via a schematically indicated system of slip ring contacts 41, 42 with connecting lines (not shown) connected to it.

To feed the fiber material, 34 fiber material feed channels 4 are arranged in the outer housing, of which only one is visible in FIG. 1. The fiber material feed channel 4 has an outlet opening 4.1 opening into an annular space 10. An offset opening 6.1 of the fiber material feed channel 6 is arranged in the cover 12.3 of the inner housing 12 opposite this. The annular space 10 is delimited on its top and bottom by annular parts 8.1 and 8.2, which are part of a rotating component which is arranged at the upper edge of the limiter pot 7 and thus rotates with it. The two ring-shaped parts 8.1 and 8.2 are connected to one another via spoke-like or column-like connecting elements. The thread guide tube 3 for the thread F3 is passed through one of these connecting elements 13.1. It is easy to see that the supplied fiber material flow FM enters from the outlet opening 4.1 through the annular space 10 into the inlet opening 6.1 as long as the passage is not covered by one of the connecting elements such as 13.1.

The delivery of the fiber material to be fed through the fiber material feed channels 4 and the fiber material feed channels 5 and 6 is carried out by means of negative pressure. The negative pressure present in the interior of the inner housing 12 continues into the annular space 10 via the fiber material feed channels 5 and 6. So that sufficient negative pressure can build up in this annular space, gap seals 14, 15 are provided in the gaps connecting the annular space 10 with the spaces under higher pressure between the outer wall of the inner housing 12 and the inner wall of the outer housing 34.

A piecing device is now described with reference to FIG. 2, which is placed on the cover 12.3 of the inner housing 12 of the device according to FIG. 1. In FIG. 2, all parts that correspond exactly to the device parts of the double-wire twisting spindle according to FIG. 1 are identified by the same reference number as there.

In the parts not shown in FIG. 2, the double-wire twisting spindle according to FIG. 2 corresponds exactly to the double-wire twisting spindle according to FIG. 1.

Above the two spinning rotors 1 and 2, two brackets 36 and 38 are arranged on the cover 12.3, each of which carries a deflection roller 16 and 17, respectively. After the piecing process, the spinning thread F1 exiting from the first spinning rotor 1 through the thread take-off tube 31 runs over the deflection roller 16 and, after being deflected by 180 °, is fed to the hollow spindle axis 11 via the inlet end 11a. In the same way, coming from the spinning rotor 2, the spinning thread F2 runs out of the thread draw-off tube 32 via the deflection roller 17, from which it is likewise deflected by 180 ° and is fed to the inlet end 11a of the spindle hollow axis 12. In FIG. 2, the spinning thread F2 is shown in the left half over the deflection roller 17 as it runs after the piecing process. In contrast, the spinning thread F1 running over the deflection roller 16 in the right half of the figure is shown in a state during the piecing process, which is explained in more detail below with reference to FIGS.

Above the deflection rollers 16 and 17, a storage wheel 18 and 19 is arranged on the brackets 36 and 38, respectively. The axes of the pulley and the storage wheel are vertically one above the other and point in the same direction. The diameter of the deflection rollers 16, 17 is significantly smaller than the diameter of the storage wheels 18, 19.

The storage wheel 19 is more precise in FIG. 3 shown. The storage wheel 18 is designed analogously.

The storage wheel 19 has a thread running groove 19.1, in which a clamping hook 20 is arranged. Furthermore, the storage wheel 19 is supported by a ball bearing 25 on an axis connected to the holder 38. An inadvertent free rotation of the storage wheel is prevented by means of a brake ring 28 arranged between the side surface of the storage wheel 19 facing the mounting 38 and the mounting 38. The pressure of the storage wheel 19 on the brake ring 28 can be set differently by means of the fastening screw 19.2 of the storage wheel 19.

The piecing process by means of the device described above is explained in more detail below with reference to FIGS. 2, 3 and 4A to 4D.

For piecing, a piecing thread strand consisting of two individual strands is threaded by hand or by means of a pneumatic threading device (not shown) through the hollow spindle axis 11 or 29, the thread guide channel 27 and the thread guide tube 3 and guided to the centering point 37. The part of the piecing thread strand AF protruding from the inlet end 11a of the hollow spindle axis 11 is, as shown for example in FIG. 4A, placed over part of the circumference of the deflection roller 17 and a thread loop FS is guided upwards and inserted into the thread running groove 19.1 from below and hooked into the clamping hook 20. The free end of the thread loop FS is, as indicated by the downward arrow, inserted into the spinning rotor 2, not shown. This shown. The storage wheel 10 is designed analogously.

The storage wheel 19 has a thread running groove 19.1, in which a clamping hook 20 is arranged. Furthermore, the storage wheel 19 is supported by a ball bearing 25 on an axis connected to the holder 38. An inadvertent free rotation of the storage wheel is prevented by means of a brake ring 28 arranged between the side surface of the storage wheel 19 facing the mounting 38 and the mounting 38. The pressure of the storage wheel 19 on the brake ring 28 can be set differently by means of the fastening screw 19.2 of the storage wheel 19.

The piecing process by means of the device described above is explained in more detail below with reference to FIGS. 2, 3 and 4A to 4D.

For piecing, a piecing thread strand consisting of two individual strands is threaded by hand or by means of a pneumatic threading device (not shown) through the hollow spindle axis 11 or 29, the thread guide channel 27 and the thread guide tube 3 and guided to the centering point 37. The part of the piecing thread strand AF protruding from the inlet end 11a of the hollow spindle axis 11 is, as shown for example in FIG. 4A, placed over part of the circumference of the deflection roller 17 and a thread loop FS is guided upwards and inserted into the thread running groove 19.1 from below and hooked into the clamping hook 20. The free end of the thread loop FS is, as indicated by the downward arrow, inserted into the spinning rotor 2, not shown. This The work step can be done by hand, as indicated in Figure 4A. But it can also be carried out by a machine. The start-up state of the piecing process is shown in FIG. 4B. On the one hand, the starting of the piecing thread strand AF through the hollow spindle axis begins, whereby the storage wheel 19 is set in rotation in the direction of arrow U against the braking action of the brake ring 28, so that, on the other hand, the other free length of thread strand in the direction of the spinning rotor from the thread loop FS (left arrow in Figure 4B) is released. The thread running direction is accordingly in FIG. 4B downward at both thread ends and thus directed in the opposite direction.

FIG. 4C shows how, after a certain angle of rotation, the clamping hook 20 comes to the underside of the storage wheel 19 so that the thread loop FS is released from the clamping hook 20. At this moment, the end of the yarn strand immersed in the spinning rotor 2 is about to reverse the direction of rotation. This indifferent state is marked towards the spindle rotor side with two open arrows I pointing in opposite directions. The withdrawal of the yarn strand into the hollow spindle axis is shown unchanged by the arrow AF.

Figure 4D shows the completed piecing process. The thread loop FS has completely fallen off the storage wheel and the yarn strand coming from the spinning motor now lies on the top of the deflection roller 17, which has a fillet for better thread strand guidance. The thread strand now has only one thread running direction, shown by the arrow AF, towards the spindle hollow axis.

The piecing process is completed with this cycle. The same process takes place in parallel on the piecing device with storage wheel 18 and deflection roller 16.

FIGS. 5A and 5B show a piecing device which, instead of the piecing device described in FIG. 2 and FIGS. 3 to 4D, can be placed on the cover 12.3 of the inner housing 12 of the device according to FIG. This piecing device differs from the piecing device described above in that the two spinning rotors 1 and 2 are each assigned deflection rollers 16 'and 17', but which cooperate with a common storage wheel 19 '. In this case, the axes of the deflection rollers and the storage wheel are not vertically one above the other but offset in the horizontal direction. The storage wheel 19 'is constructed in exactly the same way as the storage wheel 19 according to FIG. 3 and has a clamping hook 20' into which the thread loops FS1 'and FS2' are hung. The free ends of the thread loops FS1 'and FS2' are introduced into the thread take-off tubes 31 and 32 of the spinning rotors 1 and 2 in the manner already described. The piecing thread strands AF1 'and AF2' run via the inlet end 11a into the spindle hollow axis 11. The mode of operation of this piecing device is the same as described above with reference to FIGS. 4A to 4D.

In the further embodiment of a piecing device shown in FIGS. 6 and 7, the difference from the piecing device according to FIGS. 2 and 3 is that the deflection roller 17 ″ coaxial to the storage wheel 19 ″. is arranged. The deflection wheel 17 ″ is freely rotatably mounted on its axis via a bearing 25 ″, while the one side surface of the storage wheel 19 ″ bears against a brake ring 28 ″ in the manner already described. The storage wheel 19 ″ in turn carries a clamping hook 20 ″ in which the thread loop FS ″ is hung in the manner already described. The mode of operation of this piecing device is in principle the same as in the exemplary embodiments already described and can be read well from FIG. The piecing thread strand AF ″ falls on the deflection roller 17 ″ after being released by the clamping hook 20 ″. In this embodiment, each of the spinning rotors is assigned its own storage wheel.

In this embodiment it is of course also possible in principle to connect the deflection roller and the storage wheel to one another in a fixed or integral manner.

Claims (15)

1. Method of joining a thread in a device for manufacturing a twisted thread in an integrated spinning/twisting process, this device having at least one spindle rotor, which is pivot-mounted in a machine frame and can be driven, and one hollow spindle shaft, characterized in that adjoining the hollow spindle shaft there is a thread-guiding channel which runs essentially outwards in radial direction for a thread which, after emerging from the thread-guiding channel, is guided with formation of a balloon to a centring point lying in the extension of the hollow spindle shaft and is then drawn off, as well as a device for supplying unravelled fibre material into the space defined by the thread balloon,
   in that - with a device in the case of which, within the space defined by the thread balloon above the spindle rotor (25), at least two rotor spinning units (R1, R2) are located side by side and symmetrical to the hollow spindle shaft (11; 29) with spinning rotors (1, 2), which are open towards tne top, to which the fibre material is supplied and from which the spun threads (F1, F2) produced are carried off upwards and deflected in their direction of movement by 180° and are together introduced into the hollow spindle shaft (11; 29) - for each of the spinning rotors a joining skein of thread is threaded into the hollow spindle shaft and with its free end associated with the spinning rotor is introduced into the spinning rotor, whereby before this free end, in the region between the inlet opening of the hollow spindle shaft and the spinning rotor, a loop of thread of predetermined length is produced which is held and guided in the course of the subsequently carried out joining process in such a way that its first section runs into the spinning rotor, whilst its second section is drawn off into the hollow spindle shaft until the loop of thread is released and at this point, with reversal of the direction of movement of the first section, the entire joining skein of thread is drawn off in direction of the hollow spindle shaft.
2. Method according to Claim 1, characterized in that in the middle of the loop of thread a clamping point is produced which prevents passing through of spinning twists at this point and which is maintained until the loop of thread is released.
3. Device for implementing the method according to Claim 1 or 2, characterized in that - with a device in the case of which within the space defined by the thread balloon above the spindle rotor (26) at least two rotor spinning units (R1, R2) are arranged side by side and symmetrical to the hollow spindle shaft (11; 29) with spinning rotors (1, 2) which are open towards the top, to which the fibre material is supplied and from which the spun threads (F1, F2) produced are carried off upwards and deflected in their direction of movement by 180° and together are introduced into the hollow spindle shaft (11; 29) - above each spinning rotor (1, 2), in each case in the region between the extension of the axis or the spinning rotor (1, 2) and the extension of the hollow spindle shaft (11; 29), a guiding element (16, 17) is located for deflecting the thread (F1, F2) - carried off from the spinning rotor - by 180° and in the immediate vicinity of each guiding element a storage element (18, 19) is provided, for storing a loop of thread (FS) of predetermined length of a joining skein of thread (AF) introduced from the hollow spindle shaft (11; 29) into the spinning rotor (1, 2), with mechanical means (19, 20) for the storage and successive release and opening out of the loop of thread (FS) and for delivering the joining skein of thread (AF) to the guiding element (16, 17) after opening out of the loop of thread.
4. Device according to Claim 3, characterized in that the storage element (18, 19) has a clamping device (20; 19,1) for clamping the middle of the loop of thread (FS) and for releasing it after opening out of the loop of thread.
5. Device according to Claim 3 or 4, characterized in that a separate storage element (18, 19, 19") is assigned to each spinning rotor (1, 2).
6. Device according to Claim 3 or 4, characterized in that a shared storage element (19') is assigned to the two spinning rotors (1, 2).
7. Device according to one of Claims 3 to 6, characterized in that the storage element is designed as a freely rotating storage wheel (18, 19) which has on its circumference a thread-carrying groove (19, 1) and in this a hook (20) for fixing a loop of thread (FS) guided from below over a part of the guiding element (16, 17) into the thread-carrying groove (19.1) on the side facing the extension of the axis of the spinning rotor (1, 2).
8. Device according to Claim 7, characterized in that the hook (20) is designed as a clamping hook for clamping the loop of thread in the thread-carrying groove (19.1).
9. Device according to Claim 7 or 8, characterized in that on the storage wheel (19) an adjustable braking device (28) is provided for preventing an unintentional free rotation.
10. Device according to one of Claims 7 to 9, characterized in that the guiding elements (16, 17, 16', 17') are located in the region underneath the storage wheel (18, 19, 19').
11. Device according to Claims 5, 7 and 10, characterized in that the guiding element (16, 17) is in each case directly located underneath the storage wheel (18, 19) associated with it.
12. Device according to one of Claims 3 to 11, characterized in that the guiding element is designed as freely rotating deflection roller (16, 17, 16', 17') whose rotational axis runs parallel to the rotational axis of the storage wheel (18, 19, 19').
13. Device according to one of Claims 3 to 11, characterized in that the guiding element is designed as freely rotating deflection roller (17") whose rotational axis runs coaxially with the rotational axis of the storage wheel (19").
14. Device according to Claim 13, characterized in that the deflection roller is firmly connected with the storage wheel.
15. Device according to one of Claims 12 to 14, characterized in that the diameter of the deflection roller (16, 17) is smaller than the diameter of the storage wheel (18, 19).

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