DE2413454A1 - DEVICE FOR GENERATING A FALSE TWIST - Google Patents

Description

DR-ING. DIPL.-INS. M-SC- PIfL P-HVi. Dl D-pi.-ίΗΫΙ. HÖGER - LEGAL RIGHTS - GRIESSBACH - HASCKER PATENT LAWYERS IN STUTTSART - '

A 4O 625 b 2413454

March 18, 1974

k-35

Teijin Limited 1, Umeda, Kita-ku, Osaka-shi, Osaka, Japan

and

Teijin Seiki Co., Ltd.

3-7-3, Kitahama, Kigashi-ku _r Osaka-shi Osaka, Japan

Device for generating a false twist

The invention relates to a device for generating a false twist in a thread with a head having a head Rotary tubes and with aging devices for the rotary tube, which comprise two rollers which can be rotated close together are mounted on a bracket, as well as facilities,

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which the rotating tube creates a wedge-shaped gap between the Pull rollers, the bracket being held on a machine frame so as to be pivotable about a pivot pin.

In particular, the invention is concerned with the "creation of a False twist in a thread made of a thermoplastic Kunststof fiaaterial, in particular in a monofilament thread, the The false twist is generated in a device which is used to produce an unstretched one in a continuous process or to stretch incompletely stretched thread from a thermoplastic plastic material and then the stretched To give the thread a false twist or what to do with it serves to carry out the aforementioned stretching of the thread simultaneously with the generation of a false twist in the thread to be stretched.

So-called stretch texturing devices are known in which an unstretched or incompletely stretched thread thermoplastic material is stretched, and in which a false twist is then generated in the thread, the two combined operations being continuous be performed. It is also known to carry out the stretching and the generation of the false twist at the same time. It has been shown that the combination of the stretching process with the texturing process leads to reduced manufacturing costs and leads to a reduction in the manual labor required. Mainly two types of stretch texturing devices have come into play used, with one type an undrawn or incompletely drawn, preferably monofilament thread made of thermoplastic plastic material is first stretched between a take-off roller and a stretching roller, whereupon

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then insert it into the thread with the aid of a folding device False twist is generated and whereupon the thread provided with a false twist is finally opened by a winding device a bobbin is wound up. In the second type of known device, stretching and texturing are carried out simultaneously, whereupon the textured thread is then wound onto a spool by means of a winding device.

As already mentioned, this is the stretch texturing device fed material an unstretched or incompletely stretched, preferably monofilament thread. When such a thread is fed to the device, a thread end becomes first threaded from a supply roll into a false twisting device, such as a rotary tube, and then placed over a take-off roller and a draw roller, with the thread path lengthways a heating device for fixing the false twist is guided, and wherein the thread is fed to a suitable suction device will. If the unstretched or incompletely stretched thread touches the heater, the thread may break result, for example when the thread consists of a polyester and when the heating device is at a temperature of about 200 C, so that there is an interruption in operation. To avoid this difficulty is already has been proposed to start the false twisting first without the thread in contact with the heating device bring, and only then to relocate the thread path in the area of the heating device that the thread touches the same. In practical operation, however, it has been shown that the thread often breaks when the false twisting process is started without the thread already in contact with the heater exists, i.e. if the thread path is only moved to the heating device after the false twisting has started.

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The invention is based on this prior art the underlying task is to avoid the occurrence of thread breaks at the beginning of a stretch-texturing process.

This object is achieved by an apparatus of the type described at the outset Type solved, which is characterized according to the invention in that a drive system for the rotary tube it is provided that frictionally operating drive devices are provided which are in frictional contact with at least two different parts of the drive system can be brought to drive it at different speeds, which are in a predetermined relationship to one another, and that adjusting devices are provided to each one of the various parts of the propulsion system under pressure in Bring frictional contact with the drive devices so that they operate at the speed corresponding to the selected part are drivable, wherein the pressure can be brought about by pretensioning devices that close the bracket around its pivot pin seek to pivot.

The invention is based on the knowledge that in numerous Experiments in practical use have shown that there are practically no more thread breaks when they are produced of the false twist in the thread generated number of rotations during a start-up phase is kept smaller than the number of rotations during normal operation, and if between the number of rotations during start-up and during Normal operation a certain ratio is maintained ·.

According to the invention, there are thus improved drive devices for a false twisting device, especially a twist

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tubes suggested, rait the help of which it is possible that To change the drive speed of the false twisting device. In a preferred embodiment of a device for A rotary tube is used to generate a false twist according to the invention provided, which is rotatably supported by Ilalterungseinrichtung, with driven parts of the rotary tube or the aging devices have cylindrical sections, the diameter of which increases gradually, preferably along the axis of the driven part of the rotary tube or the holding devices changes, the driven part of the rotating tube or the holding devices are held in frictional contact with drive devices by prestressing devices is, and wherein the relative position of the driven parts with respect to the drive devices with the aid of adjusting devices is adjustable in the direction of the axis of the rotating tube or the mounting devices. The actuating devices are preferably operated by hand.

Further details and advantages of the invention are provided below explained in more detail with reference to a drawing and / or are the subject of the claims for protection. In the drawing show:

Fig. 1 is a schematic side view of a stretch texturing device with a False twisting device according to the invention;

Fig. 2 is a schematic plan view of the false twisting device according to Fig.ij

3 shows a section through the false twisting device

according to Figure 2 along the line III-III in this Figure;

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FIG. 4 is a schematic illustration to explain the pretensioning devices of FIG False twisting device according to Figures 2 and 3;

4B shows a schematic representation to explain the acting in the pretensioning devices Forces;

5 shows a schematic plan view of a modified one Embodiment of a false twisting device according to the invention;

6 shows a side view of the false twisting device according to FIG. 5 along the line V-V in this figure;

7 shows a side view of the right side of the false twisting device according to FIG. 6;

8 shows a schematic plan view of a further embodiment of a false twisting device according to the invention;

9 shows a side view of the false twisting device according to FIG. 8, partly in section;

10 is a schematic plan view of a third exemplary embodiment of a false twisting device according to the invention and

11 is a side view of the false twisting device according to Fig. 10, partly in section.

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Because the false twisting device is the essential component of the texturing device is used below instead of false twisting devices of texturing devices spoken.

In the drawing-texturing device shown in FIG According to the invention, an unstretched thread 1 is fed from a roll to a take-off roller 4 after it has passed a thread guide 3 happened. The thread is then stretched in a stretching zone between the take-off roller 4 and a stretching roller 8, which with runs at a higher peripheral speed than the take-off roller 4. A texturing device 7 is arranged in the drawing zone, which the thread 1 ^ while it is stretched, a false twist granted. During the stretching and texturing process, the false twist given to the thread is between the texturing device 7 and the take-off roller 4 thermally fixed with the aid of a heating device 5, which along the thread path between the take-off roller 4 and the texturing device 7 lies. At the same time, the thermally fixed false twist between the The texturing device 7 and the drafting roller 8 are lifted again and the thread 1 is wound up with the aid of a winding device 9 a coil 10 is wound. As FIG. 1 shows, there is a guide pin which can be adjusted with the aid of a bracket (not shown) 6 provided, which serves to remove the thread path from the heating device 5 / if this is necessary to the thread to be inserted into the device.

The one used in the drawing texturing device according to FIG improved texturing device 7 is shown in FIGS Details shown. It can be seen that the texturing device 7 comprises a rotary tube 11, which consists of a tube 11a.

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and an enlarged diameter portion 11b provided in the center thereof in the axial direction. At the A head 11d is formed on the lower end of the tube 11a, in which a transverse pin 11c is rigidly attached. The top end 11e of the tube 11a also has an enlarged diameter. The texturing device 7 is driven by a friction wheel 12 in such a way that the region 11b of the rotary tube 11 is pressed against the friction wheel 12 during the threading and that at a predetermined point in time after the thread 1 in the device was threaded, an area of smaller diameter of the tube 11a pressed against the friction wheel 12 will. The rotating tube 11 is between two rollers 13, 14 rotatably supported, each of which has two flanges 13a, 13b or 14a, 14b, which, as is clear from Figure 3, are arranged so that the head 11d and the upper end 11e of the rotary tube 11 on the upper side or the lower side the mentioned flanges. Because the roles 13 and 14 are identical are constructed, only the roller 13 will be considered in more detail below. The roller 13 is inside provided with a position arrangement (not shown) and rotatably mounted on an axis 15, which in turn with the help of a Nut 17 is rigidly attached to a bracket 16. A permanent magnet 18 is rigidly held by the bracket 16, so that the Rotary tube is tightened in the direction of the rollers 13 and 14 and held stably in a desired working position can, as Fig.2 shows. At the other end of the bracket 16, a vertical, hollow tubular element 16a is provided in which a bearing 19 is rigidly attached. Inside the bearing is a vertical, cylindrical cavity 19a as well a head part 19b with an opening 19c at the upper end. On one Retaining bracket 21, which by means of screw and nut 23 firmly

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is attached to a machine frame 22, a vertical pivot pin 20 is attached. The pivot pin 20 protrudes into the cavity 19a in such a way that the bearing 19 can pivot about it. The pivot pin 20 is provided with a tapered part 20a, which forms its upper half and which protrudes outward through the opening 19c of the bearing 19. The tapered part 20a of the pivot pin 20 is surrounded in the cavity 19a of the bearing 19 by a helical spring, by which the bearing 19 is constantly pushed upwards, so that the bracket 16 is also constantly pushed upwards Cam plate 26 is pivotable in such a way that its cam path is always in contact with the top of the bearing 19, as Fig.3 shows..Die cam plate 26 is provided with an operating handle 27, with the help of which the cam plate 26 around the pin 25. If the cam plate 26 is pivoted by hand about the pin 25, the bracket 16 can be moved up and down so that the area of the rotating tube 11, which rests against the friction wheel 12, can be changed by pivoting the cam plate 26. The cam plate 26 is thus formed so that ^ a of their curved path of the strap is held in the position shown in Figure 3 in solid lines, position 16 by means of a field ^2, while with the aid of a flat portion 26b of its cam track, v / hich at the curved area 26a adjoins, the bracket 16 can be moved from this holding position into a position shown in dash-dotted lines. If the curved area 26a of the cam path of the cam plate 26 rests against the head part 19b of the bearing 19, then, since the bracket 16 is made with the aid of a spring mechanism, which will be explained below,

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is printed in the direction of the friction wheel 12, the area 11b larger diameter of the rotary tube 11 pressed against the friction wheel 12, while when the flat area 26b on the head piece 19b of the bearing 19 rests, the thin area of the tube 11a of the spindle 11 is pressed against the friction wheel 12, and with the mentioned spring mechanism. According to the two mentioned contact conditions between the rotating tube 11 and the friction wheel 12, the rotary tube 11 can either be driven at the higher or lower speed. To during the adjustment of the rotating tube 11 to avoid any disturbance with regard to the friction wheel 12, a peripheral region 12a of the friction wheel consists of an elastic one Material such as rubber or plastic. In addition, to avoid any damage to the rotating tube 11 the peripheral areas of the flanges 13a, 13b and 14a, 14b of the rollers 13 and 14 are made of an elastic material such as rubber or plastic. When viewed Texturing device, the bracket 16 is always pretensioned during the false twisting so that it is around the pivot pin 20 pivots in the direction of the friction wheel 12. When it is desired to remove the rotary tube 11 from the friction wheel 12, is the bracket 16 is forced to pivot about the pivot pin 20 in a direction in which it moves away from the friction wheel 12. In order to bring about the described pivoting movement of the bracket 16, a spring mechanism is provided which comprises a pin 28 which is fastened to the bracket 16, as FIG. 3 shows, which further comprises a horizontal pin 29 which is attached to the retaining bracket 21, and which comprises a tension spring 30, the ends of which on the pins 28 and 29 are attached that when the pin 28 is adjacent to a line which is the central axis of the pivot pin

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20 and the attachment point of the tension spring 30 on the pin connects to one another, the bracket 16 also from that of the aforementioned Line corresponding position is pivoted into a position corresponding to the position of the pin 28, while when the Pin 28 is in extension of the line mentioned, the spring force the tension spring coincides with this line, so that the tension spring does not bring about any pivoting movement of the bracket 16.

In FIGS. 4Λ and 4B, the above-mentioned line is represented by a line P ₂ " ² ^, while the different positions _{are denoted by P 1} and P _3. Assuming that the spring force at position P _{1 is} equal to F, and that the angle between the line 28-29 and the line 20-29 is equal to θ, then the force F ¹ , which presses the bracket 16 in the direction of the friction wheel 12, is equal to F'sin θ and consequently the torque of the The bracket 16 with respect to the pivot pin 20 in the direction of the friction wheel 12 can be expressed by the value LF · sin θ, where L is the distance between the axis of the pin 28 and the axis of the pivot pin 20. The rollers 13 and 14 consequently press the rotating tube .11 with a predetermined contact pressure generated by the tension spring 30 against the friction wheel 12. If it is necessary to lift the rotary tube 11 from the friction wheel 12, the bracket 16 can easily be pivoted by hand about the pivot pin 20 so that he himself from the friction wheel 12 removed. In order to avoid excessive pivoting of the bracket 16 from the friction wheel 12, a stop (not shown) is provided on the retaining bracket 21.

Next, the mode of operation of the texturing device under consideration will now be explained in detail. If it

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1 to 3 is required, the thread 1 in the To introduce texturing device, the bracket 16 is first pivoted about the pivot pin 20 in order to lift the rotary tube 11 from the friction wheel 12. Then one end of the thread is 1 threaded from the roll 2 through the rotary tube 11. Afterward the thread end is sucked in by a suction device (not shown). In this operating state, pivoting of the operating handle 27 by hand, the curved portion 26a of the cam path of the cam plate 26 in contact with the surface brought the head part b of the bearing 19, as Fig.3 shows and the rotating tube 11 is supported by the flanges 13a, 13b and 14a, 14b of the rollers 13, 14 held. Thereafter, the bracket is 16 in Swiveled towards the friction wheel 12, so that the area 11b of enlarged diameter of the rotary tube 11 against the Friction wheel 12 is pressed. The thread is then passed over one by one the take-off roller 4 is placed, passed in the vicinity of the heating device 5 and placed over the stretching roller 8. During the above The threading process described is the thread path 1 in contrast to the normal Fetriebsbedingungen with the help of Guide pin 6 kept away from the normal path with respect to the heating device 5, as indicated by the dash-dotted line Line in Fig.1 is indicated. In this operating state, the winding device 10 begins to wind up the thread 1. The initial one False twist is consequently given to the thread by a rotation of the texturing device 7, which is caused by the frictional contact between the area 11b of enlarged diameter of the rotary tube 11 and the friction wheel 12 is generated. Then the Thread path moved in the direction of the normal thread path with respect to the heater 5, and then the cam plate 26 of Hand rotated with the aid of the operating handle 27 to the level

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To bring region 26b of its curved path into contact with the top of the head piece 19b of the bearing 19, so that the spring is pressed together, and so that the wing 16 is down in a position is moved, which is shown in Figure 3 in dash-dotted lines.

Corresponding to the above-mentioned downward movement of the bracket 16 the flanges 13b, 14b of the rollers 13 and 14 are made to to press the head 11d of the rotary tube 11 down until the rotary tube 11 is moved into the normal operating position, the is indicated in Figure 3 in dash-dotted lines. When the rotating tube is moved to this normal operating position, an area of smaller diameter of the tube 11a of the rotating tube 11 is brought into contact with the friction wheel 12. To the Thread 1 is consequently given a false twist. After the thread has been threaded into the texturing device, it is as above erv / ähnt, first of all the larger diameter area 11b of the rotary tube 11 in contact with the friction wheel 12, specifically for a given period of time. Under normal operating conditions ■ there is an area of smaller diameter of the pipe 1 Ta des Rotary tube 11 in contact with the friction wheel 12. At the time of the threading of the yarn into the texturing device is consequently the number of rotations given to the thread in a given one Reduced ratio, this ratio being equal to the ratio of the diameter of the area of smaller diameter of the tube 11a or the area 11b is of larger diameter. In the course of experiments it was found that the above The ratio is preferably between 0.5 and 0.85. If the speed ratio or the ratio of the thread he. split turns falls out of this area, it is difficult

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rig to get good results. In the embodiment under consideration the tube 11a has a laterally widened area or a step 11b; however, there can also be several gradually widened areas be provided, or that Tube can be concave in shape. When the shape of the tube 11a of the rotary tube 11 in the above-mentioned manner is changed, the cam path of the cam plate 26 can be changed as it corresponds to the changed shape of the tube 11a.

A modified embodiment of a texturing device according to the invention is shown in FIGS. In this embodiment, a driven shaft is attached coaxially to at least one of the rollers 13, 14 in such a way that the driven shaft is printed in contact with the friction wheel 12 is and that the rotary tube 11 by frictional contact with the Rollers 13 and 14 is driven. To simplify the presentation only those parts and functions are shown, which from the first Ausung.sbeispiel according to FIGS. 1, 2 and are different. These differences are explained below.

The rollers 13 and 14 are rotatably mounted on the bracket 16 and the rotating tube 11 is rotatably supported by the rollers 13 and 14, as a result of the attraction by the permanent magnet 10 in the wedge-shaped space between the rollers 13 and 14. The relationships here are the same as in the first embodiment. As in the considered embodiment das'Drehröhrchen 11 is not driven directly by the friction wheel 12 it is not necessary to provide gradually widened areas on the rotary tube. One of the

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Desired embodiment, the driven shaft 31 is coaxially connected wit the shaft of the roller blind 13, in such a way, that the driven shaft 31 protrudes downwards over the bracket 16. Era lower end of the driven shaft 31 is a Part 32 of enlarged diameter is provided so that either the main part of the driven shaft 31 or its section 32 can be brought into contact with the friction wheel 12 körinen when the bracket is moved up or down. As 6 and 7, on the vertical hollow tubular part 16a of the bracket 16, there is a horizontal pin 33 mounted in such a way that it is in contact with the cam track of a. There is a guide element 34 which is rigidly attached to the retaining bracket 21 is attached. In addition to the curved track 34a, the guide element 34 has an incision 34b.

The texturing device according to FIGS. 5 to 7 works as follows: First the rotary tube 11 is swiveled away from the rollers 13 and 14, after the bracket 16 has been pivoted about the pivot pin 20 by the friction wheel 12 v / harrow. Then an end to the Thread 1 from roll 2 (see Fig. 1) into rotating tube 11 threaded. The operating handle 27 of the cam plate 26 is then rotated in such a way that the cam plate 26 in the position shown in Fig. 6 is reached. Simultaneously ^ OgWJ ^ dj.der Thread from a suction device (not shown) '/, while the operating conditions described above, the rotating tube 11 from the rollers 13 and 14 by the tensile force of the Permanent magnets 18 held. Then the bracket 16 pivoted in the direction of the friction wheel 12, so that the section 32 of enlarged diameter of the driven shaft 31 the roller 13 is pressed against the friction wheel 12. After leaving

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At the end of the mentioned movement, the thread 1 is fed to the take-off roller 4, the heating device 5 and the drafting roller 8 (Fig. 1) created. The thread path is changed compared to the normal thread path by adjusting the guide pin 6, see above that the thread runs along the dash-dotted line in Figure 1. In addition, the thread 1 is fed to the winding device 9. During these operating conditions, the thread 1 is given a false twist by the rotary tube 11, since the section 32 of the driven shaft 31 is in frictional contact with the friction wheel 12, so that the roller 13 is driven.

During this operating state, the horizontal pin 33 held in a position in which it is not in contact with the cam track 34a of the cam plate 34, as shown in FIG shows. Subsequently, the thread 1 is then brought to its normal thread path with respect to the picking device 5 and then the cam plate 26 is pivoted by hand in such a way that the straight section 26b of the cam path is in contact with the top of the head part 19b of the bearing 19 arrives. With the one mentioned Pivoting movement of the cam plate 26 moves the bearing 19 downwards and presses the helical spring 24 together. Included the horizontal pin 33 moves along the curved path 34a of the guide element 34 downwards, so that the bracket 16 around the pivot pin 20 is pivoted. As a result of this pivoting movement, the section 32 reaches the driven shaft 31 out of engagement with the friction wheel 12. If the bracket 16 then still is moved further down to its lowest position, the horizontal pin 33 comes into the notch 34b of the guide element 34. This also removes the connection between the bracket and the guide element 34 via the pin 33, see above that the bracket 16 under the spring action of the tension spring 30 a

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Can perform pivoting movement about the pivot pin 20, in the direction of the friction wheel 12, so that now a Part of the smaller diameter of the driven shaft 31 is pressed into frictional contact with the friction wheel 12.

When the thinner section of the driven shaft 31 is in contact with the friction wheel 12 is, the roller 13 is driven at normal speed, so that the thread 1 for the Iloriaalbetrieb certain false twist is granted. In the embodiment under consideration, the upper part is thinner and the section 32 of enlarged diameter of the driven shaft 31 temporarily out of engagement with the friction wheel 12 brought, namely during the implementation of the friction wheel from the section 32 to the thinner section, so that wear the driven shaft 31 or the section 32 of the same can be completely avoided. In some cases it can however, it can also be advantageous to dispense with the horizontal pin 33 and the guide element 34, so that the change in speed for the rotary tube 11 takes place in the same way as in the first embodiment, 'which in the Fig. 1 to 3 is shown.

In the two embodiments considered above the relative position of the friction wheel 12 with respect to the rotary tube or the driven shaft 31 of the roller 13 is determined The cam plate 26 is pivoted with the aid of the operating handle 27. It goes without saying that to rotate the cam plate 26 other devices can also be used than the operating handle 27. When used in practice in a spinning mill However, it has been shown that hand-operated operating handles, as shown in the two shown

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1 March 8 1 974 O / Ί Ο / tr /

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Exemplary embodiments used v / earth, are particularly practical to the speed or rotational speed change of the rotary tube bring about.

Further embodiments according to the present invention are intended will be explained below with reference to further figures of the drawing. For a better understanding, those elements are which have a corresponding function are denoted by the same reference numerals as in FIGS. 3 and 6. FIGS show a further embodiment of a texturing device according to the invention, in which two rollers 13 and 14 are rotatable in bearings 44 and 45, which in turn are rigidly attached to an auxiliary bracket 41 by means of fastening elements 42 and 43, respectively are mounted. The permanent magnet 18 is rigidly held by the auxiliary bracket 41, so that the rotary tube 11 is pulled against the rollers 13 and 14 that the tube 11a of the rotary tube 11 on the upper flanges.13a, 14a and the lower flanges 13b, 14b of the rollers 13, 14, in a wedge-shaped Zv / ischenraum between the rollers 13 and 14 is present, as shown in FIGS. 8 and 9. On the bracket 16 is a hollow one Cylinder 39 rigidly mounted. The auxiliary bracket 41 ^ with an opening provided, which is located directly under the rotary tube, and is rotatable on the hollow cylinder 39 in this way mounted so that it reaches through the opening mentioned. The auxiliary bracket 41 can therefore pivot about a line, which lies in the extension of the longitudinal axis of the rotary tube 11. In order to prevent the auxiliary bracket 41 from becoming detached from the bracket solves, a cap 40 is screwed to the upper end of the hollow cylinder 39. At the bottom of an elongated shaft 35 of the shaft 13, a driven friction wheel 37 is rigidly mounted, while an elongated shaft 36 is mounted at the lower end

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a driven friction wheel 38 is rigidly mounted on the roller 14. The two shafts 35 and 36 are arranged on the auxiliary bow 41 in such a way that that one or the other of the driven friction wheels 36, 38 can be brought into contact with the friction wheel 12. In the embodiment shown, the diameter of the friction wheel 38 is greater than that of the friction wheel 37. The auxiliary bracket 41 has a side surface 41 a which is part of a cylindrical surface coaxial with the hollow cylinder 39 runs. Recesses 41b are provided on the side surface 41a. A small bracket 46 is rigidly mounted on the bracket 16. The small bracket 46 is provided with an opening 46a into which a cap 47 is screwed. The cap 47 is provided with an opening 47a in which a pin 48 is slidable is. The pin 48 has a larger diameter head. A coil spring 49 is inserted into the opening 46a inserted so that the pin 48 is constantly against the side surface 41a of the horizontal Ililfsbügel 41 is pressed. Of the The head of the pin 48 can engage in one of the recesses 41b of the auxiliary bracket 41, so that the mutual position of auxiliary bracket 41 and friction wheel 12 can be precisely determined. Two grooves 50a, 50b are provided in the bracket 16 and enable a free pivoting of the auxiliary bracket 41 about the hollow cylinder 39. An operating handle 52 is located on the auxiliary bracket 41 appropriate. The mutual position of the Ililfsbügel .41 and the friction wheel 12 can by actuating the operating handle 52 so be set so that either the friction wheel 37 or the friction wheel 38 is in contact with the friction wheel 12. When the friction wheel 37 rests against the friction wheel 12, the rotary tube 11 is driven at the normal operating speed to avoid the incorrect

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twist to generate in normal operation. In contrast, when the thread is being threaded in or when the device is started up, the friction wheel is turned off 38 pressed against the friction wheel 12, so that the rotary tube 11 is driven at a lower speed. The facilities with the help of which the friction wheels 37 and 38 are pulled against the friction wheel 12, are similar to those described above Embodiment. The pin 28 is thus again attached to the bracket 16, and at one corner of the bracket 16 is a pivot pin 2O is provided in the form of a hollow cylindrical member. The retaining bracket 21 is rigid on a frame (not shown), and the horizontal pin 2 9 is mounted on the bracket 21 so that its one End protrudes into the same. This end of the pin 2 9 is connected to the pin 28 via the tension spring 30. Of the A vertical pivot pin 51 protrudes from the top of the retaining bracket 21 in such a way that it acts as a bearing pin for the hollow Trunnion 2O is used. With the top of the trunnion 51 a fastening element 53 is screwed. In the construction under consideration, the auxiliary bow 41 is in operation during operation always pretensioned by the retaining bracket 16 so that it rotates about the pivot pin 51 in the direction of the friction wheel 12. As a result, either the friction wheel 37 or the friction wheel 38 can be pressed against the friction wheel 12.

As has already been explained above, when it is desired to drive the rotary tube 11 at the normal operating speed, the operating handle 52 is operated in such a way that the friction wheel 37 rests against the friction wheel 12. The pin 48 engages in the corresponding recess 41b so that UIeSe ₇ dom normal operation corresponding position of the auxiliary strap is maintained 41st If, on the other hand, a thread enters the texturing device

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is to be threaded, the operating handle 52 is operated so that there is contact between the friction wheel 37 and the friction wheel 12 is canceled and instead the friction wheel 38 is brought into contact with the friction wheel 12. In this operating state becomes the mutual position of the "bracket 16" and the auxiliary bracket 41 secured in that the pin 48 engages in another recess 41b of the auxiliary bracket 41. The change of Speed for the rotary tube 11 can therefore be brought about more easily and are retained better than in the exemplary embodiments according to FIGS. 3 and 6.

The embodiment shown in FIGS. 10 and 11 represents a modification of the embodiment according to FIGS because the only difference is that the rollers 13 and 14 and the friction wheels 37 and 38 are designed differently are. In the following description of the exemplary embodiment in accordance with FIGS. 10 and 11, therefore, reference should be made to the further explanation those elements which have already been explained in connection with FIGS. 8 and 9 are dispensed with. In the embodiment According to FIGS. 10 and 11, the diameter of the friction wheel 38 is equal to the diameter of the friction wheel 37. The diameter of the flange 13a, which is identical to the diameter of the flange 13b, is, however, smaller than the diameter of the flange 14a, which is equal to the diameter of the flange 14b is. If consequently the friction wheel 37 is pressed against the friction wheel 12, then the rotary tube 11 with a smaller one Speed driven than when the friction wheel 38 is applied to the friction wheel 12. As already "explained above, the speeds of the Rotary tube 11, namely the normal operating speed and a lower speed can be selected by having the Friction wheel 12 either with friction wheel 37 or with friction wheel 38:

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brings in contact. This change in operating mode is brought about with the aid of the control handle 52.

As mentioned above, in the two last-described exemplary embodiments the mechanism for changing the speed of the rotary tube 11 is characterized by two rollers 13 and 14, whose flanges rotate at different peripheral speeds. The friction wheel 12 serves to drive the rollers 13 and 14 to be driven via the friction wheels 37 and 38, respectively. Instead of the friction wheel 12, however, a rotating belt can also be used, which has the same function.

According to the invention, the number of times given to the thread Twists (in the form of a false twist) at the time of threading of the thread 1 in the texturing device or when starting the same reduced in comparison to the normal operating conditions thereby reducing the frequency of yarn breaks that previously occurred when texturing devices were put into operation, can be reduced noticeably, so that commissioning can be carried out effectively and easily. It is also at thread breakage in one of the texturing devices of a machine with several texturing devices to be carried out independently of the other texturing devices, so that the effectiveness of the machine can be increased significantly » can. In addition, the amount of yarn that is lost during the threading process can be considerably reduced, since the number the rotations imparted to the thread can be changed in each texturing device independently of the others.

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4Q9842 / 1G0Q

Claims (13)

A 40 625 b - 23 - March 18, 1974 P at e η t claims: Device for generating a false twist in a thread with a rotating tube having a head and with aging devices for the rotary tube, which comprise two rollers which are rotatable close to one another on one Brackets are mounted as well as devices, which the rotary tube in a wedge-shaped .Spalt between the rollers pull, the bracket being held on a machine frame such that it can pivot about a pivot pin, .thereby marked that one for the rotating tube Drive system is provided that frictionally operating drive devices are provided which are in frictional contact can be brought with at least two different parts of the drive system and this with different speeds drive, which are in a predetermined ratio to each other, and that adjusting devices are provided to each one of the various parts of the drive system under pressure in frictional contact with the drive devices to bring so that they can be driven at the speed corresponding to the selected part, the pressure can be brought about by biasing devices that seek to pivot the bracket about its pivot pin. 2. Device according to claim 1, characterized in that the drive system comprises the tube of the rotary tube, which is formed in one piece with the head, and that the pipe in its central part at least one area - 24 - 409842/1000 A 40 625 b - 24 - March 18, 1974 k-35 24 134 5 A has enlarged diameter, the tube and its enlarged diameter portion having two different parts represent, the frictional contact with the drive devices can be brought. 3. Apparatus according to claim 1, characterized in that the drive system has at least one of the rollers of the holder includes devices, which is provided with a drivable shaft, which is a portion of enlarged diameter possesses, wherein the drivable shaft and its part of enlarged diameter represent two different parts, with which the drive devices can be brought into frictional contact. 4. Apparatus according to claim 2 and 3, characterized in that the adjusting devices for optional manufacture frictional contact with one of the parts of the drive system the bracket in the direction of the axis of the pivot pin optionally Adjust up or down in such a way that the drive system, depending on the selected, with the drive devices in frictional contact with a predetermined part Speed is drivable. 5. Apparatus according to claim 1, characterized in that the drive system the two roles of the mounting devices includes, V the roller flanges of different diameters, own that each of the roles has a coaxial one, according to pointing has down / driven shaft, and that a section each of the driven shafts below the bracket is provided with a driven friction wheel, such that the driven friction wheel can be driven by frictional contact with the drive devices. - 25 - 409142/1000 A 40 625 b - 25 - March 18, 1974 6. Apparatus according to claim 5, characterized in that the bracket is mounted on a bracket so that it can pivot about a pivot axis, which is an extension of the longitudinal axis of the Rotary tube is that the adjusting devices for producing the frictional contact of one of the various parts of the drive system with the drive devices comprise the bracket and the retaining bracket, and that safety devices are provided to secure the bracket in its position with respect to the retaining bracket in the positions in which one or the other of the driven friction wheels on the driven shafts of the rollers in frictional contact with the drive directions. 7. The device according to claim 6, characterized in that each of the rollers with an upper and a lower splash has the same diameter that the diameter of the flanges of one roller is larger than the diameter the flanges of the other roller, and that the driven friction wheels on the shafts of the rollers are of the same diameter own. 8. The device according to claim 6, characterized in that the two rollers each have an upper and a lower flange that all the flanges have the same diameter and that the driven friction wheels are on the shafts the rollers have different diameters. 9. Device according to one or more of the preceding claims, characterized in that devices are provided are in order to temporarily increase the frictional contact between the drive system and the drive system - 26 - 409842/10 00 A 40 625 b - 26 - March 18, 1974 interrupt when the frictional contact of the drive devices with one of the various parts and with a • Another of the various parts is to be manufactured. 10. Device according to one or more of the preceding claims, characterized in that the biasing devices comprise at least one spring which seeks to pivot the bracket about its pivot pin to a
Establish frictional contact between the drive system and the drive devices, namely a coil spring, one end of which is attached to a bracket that
is connected to the machine frame, and the other end of which is connected to the bracket while stretching the helical spring. 11. Device according to one or more of the preceding Claims, characterized in that * the drive devices comprise a friction wheel. 12. The device according to claim 1 to 10, characterized in that the drive means comprise an endless belt which is in frictional contact with various parts of the
Drive system can be brought. 13. Device according to one or more of the preceding claims, characterized in that the ratio
the different speeds when driving two different parts of the drive system in the range between about 1; 0.5 and 1: 0.85. 409842/1000 Blank page