CN111465726B - Spinning machine and compression device - Google Patents

Abstract

A spinning machine having a plurality of drafting devices (2) for drafting a fiber assembly (8), respectively, on which top rollers of the drafting device (2) are arranged , the drafting device has a pair of output rollers (5) consisting of a top output roller (6) and a bottom output roller (7) arranged below it, and a longitudinal member (46), which is substantially parallel to the An output bottom roller (7), and a pneumatic compression device (20) for compressing the drafted fiber aggregate (8) arranged downstream of the output roller pair (5) of the drafting device (2) , the compressing device has a suction pipe (17) which can be sucked, the suction pipe is surrounded by a screen element (18), wherein the suction pipe (17) is arranged in a fixed frame ( 28) on the holder (25) and supported in a rotatable and/or movable manner.

Description

Spinning Machines and Compressors

technical field

The invention relates to a spinning machine having a plurality of drafting devices each for drafting a fiber assembly (Faserverband), the drafting devices each having: a top roller and a bottom roller and a load arm, the drafting devices The top roller of the extension device is arranged on the load arm; the output roller pair is formed by the output top roller and the output bottom roller arranged below the output top roller; the longitudinal member, in particular the punch seat, the longitudinal member generally The upper extends parallel to the output bottom roller; and a pneumatic compressing device arranged downstream of the output roller pair of the drafting device for compressing the drawn fiber aggregate, the compressing device has a suction pipe that can be sucked, The suction tube is wound by a screening element, and the invention also relates to a compression device for a drafting device with a suction tube that can be sucked.

Background technique

The drafting device for a spinning machine comprises at least two pairs of rollers between which the fiber aggregate is drafted based on the different rotational speeds of the roller pairs. The drafted fiber aggregate then leaves the drafting device and is sent to the roller pair called the output roller pair of the spinning device. The output roller pair is composed of an output upper roller and an output lower roller or an output cylinder, and the output upper roller and the output lower roller form a clamping point for the fiber aggregate to pass through. A device for compressing the drawn fiber aggregate is arranged after the pair of output rollers. Mechanical and pneumatic compression devices are used.

Devices of this type are known in the prior art and are always used when the sliver needs to be compressed after passing through the drafting process in the spinning machine. A corresponding device is described, for example, in DE 100 50 089 A1. The compression device disclosed in this case is pneumatic and mainly consists of a suction shoe (Saugschuh) and a perforated conveying member. Therein, a pressing element is attached to one of the rollers of the output roller pair, which pressing element and this roller form a second clamping point next to the clamping point between the output top roller and the output bottom roller. DE 100 50089 A1 does not discuss how to implement the fixing of the pressing element in the spinning machine. The disadvantage of this arrangement is that, when the pressing element is inadvertently abutted against the rollers of the output roller pair, the fiber aggregates may be subjected to irregular compression.

Another device of the same type is described in DE 100 19 436 A1. The compression device disclosed in this case is also pneumatic, having a hollow profile and a perforated conveying member for the compression device. The fiber aggregates leaving the output roller pair of the drafting device are placed on the perforated transport member and guided by the perforated transport member through the hollow profile. The hollow profile can be pressed against one of the rollers by means of at least one press-fit element. The publication does not discuss the design and securing location of this press fit element. A disadvantage of the disclosed device is that a press fit element alone does not ensure that the hollow profile can be pressed against the roller in a well-defined manner. Furthermore, whether the hollow profile can be pressed against the output top roller unambiguously depends on the position of the output top roller, which in turn depends on the setting of the pressure arm of the drafting device carrying the output top roller.

SUMMARY OF THE INVENTION

The object of the present invention is to improve the known devices and to provide a compacting device which is of simple construction and can be used at a single spinning position and is characterized by a reliable and uniform compaction of the fiber aggregate.

This object is achieved by a drafting device and a compression device having the features of the independent claims.

The spinning machine of the present invention has a plurality of drafting devices each having a top roller and a bottom roller and a load arm on which the top roller of the drafting device is arranged. The pair of output rollers is formed by a top output roller and a bottom output roller arranged below said top output roller, said output bottom roller extending through several drafting devices arranged parallel to each other. The longitudinal member, in particular the punch seat, extends substantially parallel to the output bottom roller. Downstream of the pair of output rollers of the drafting device, a pneumatic compressing device for compressing the drafted fiber aggregate is provided. The compression device has a suction tube that can be sucked. The straw is wrapped around a sieve element. In this way, the fibers from the fiber aggregate are not sucked into the straw. The fiber aggregate can be uniformly compressed and transported through the pinch point between the suction tube and the delivery top roller or the delivery bottom roller. The screen elements are preferably screen belts, but also screen rollers.

According to the invention, the straw is arranged on a holder fixed to the frame and is rotatably and/or slidably mounted. The holder ensures that the straw can be received and fixed in a well-defined manner. By arranging the holder on the frame, the suction tube remains stationary on the drafting device when the drafting device is opened (ie the load arm is lifted). In this way, the arrangement of the suction tube relative to the delivery top roller or relative to the delivery bottom roller is also maintained after the drafting device has been opened and closed again. This keeps the setting once. As a result, the fiber aggregate is reliably and uniformly compressed. The holder provides a well-defined position for the straw because the holder is fixedly mounted in the spinning machine. The suction tube is arranged on the holder. Since both the output bottom roller and the holder with the suction tube are fixed to the frame, a clear correspondence of the suction tube to the output top roller or the output bottom roller can be achieved. This also ensures that the suction tube rests evenly on the output top roller or the output bottom roller. There is no angular deviation between the suction pipe and the output top roller or the output bottom roller, but are parallel to each other, so as to achieve uniform compression of the fiber aggregate.

In an advantageous solution of the invention, the holder is a deflectable lever. The lever is arranged in particular on a longitudinal part of the spinning machine. The longitudinal members make it possible to fix all holders of adjacent drafting devices of the spinning machine in the same way, since the longitudinal members extend along all spinning positions or drafting devices.

In order to press the suction pipe uniformly against one of the two rollers of the output roller pair, it is advantageous to provide spring means which act on the suction pipe and/or the holder and cause the suction pipe to Press against the output top roller or the output bottom roller. In a preferred embodiment, the compression force of the spring is also adjustable, which ensures that the straw is loaded evenly, thereby ensuring that the fiber aggregate is continuously and uniformly compressed.

In a particularly advantageous solution of the invention, the compression device has a fiber bundling region, and the fiber bundling region is bounded by two pinch points. A first clamping point is defined by the two rollers of the output roller pair and a second clamping point is formed by one of the two rollers of the output roller pair and the screening element. The fiber assembly is clamped on these two pinch points and compressed at the suction tube, which allows the fiber assembly to be aspirated between the two pinch points.

In an advantageous embodiment of the invention, the holder accommodates a single drinking straw, or two drinking straws, in particular connected to each other. Either of the two straws corresponds to one of the two adjacent drafting devices. The holder arranged on the output bottom roller provides, via a suction pipe, the underpressure required for the compression device for two drafting devices arranged side by side, the top roller being carried by a load arm. The design is particularly simple: two suction tubes are connected to each other pneumatically, or a single suction tube is provided for two adjacent drafting devices. In this way, it is not necessary to provide two suction pipe joints to provide negative pressure for the suction pipe, but only one joint is required to be able to suction the two adjacent suction points at the same time. Of course, it is also possible to provide one suction tube per holder and per drafting device.

It is particularly advantageous that the suction pipe is mounted in the holder so as to be tiltable about an inclined axis oriented transversely to the axis of the output bottom roller, and/or that the holder is on the frame, In particular, the longitudinal part is mounted so as to be tiltable about an inclined axis oriented transversely to the axis of the output bottom roller, so as to be oriented parallel to the axis of the output bottom roller. This movable installation method ensures that the suction pipe can be optimally matched with the rollers of the output roller pair and can evenly press the output bottom roller or the output top roller.

Preferably, the springs of the spring arrangement are supported on the frame, in particular on the longitudinal part, and/or on the holder. This enables a simple and cost-effective design of the spring arrangement.

In an advantageous embodiment, the spring arrangement has at least one compression spring and/or at least one torsion spring in order to press the suction tube against one output top roller or two adjacent output top rollers with a constant linear load, Or compress the output bottom roller. A certain elasticity of the clamping point K2 is obtained by this spring device, so that, for example, when encountering thick knots of the fiber assembly, there is no need to worry about damage to the compression device, since the compression device can be avoided against the spring pressure.

In a preferred embodiment of the invention, it is possible if the spring means are arranged centrally on a drinking straw or between two drinking straws, or if in each case at least one spring device is arranged beside one or both drinking straws. The suction pipe evenly presses the output roller to center the roller corresponding to the suction pipe. This uniform compaction is particularly important if a particularly good yarn quality is to be obtained.

If the spring means are arranged such that the one or both suction tubes are pressed along the longitudinal guide against one roller of the pair of output rollers, in particular the top roller, it is ensured that the suction tubes do not move relative to the Rolla leans. This ensures a particularly flexible sliding of the suction tube towards the roller.

In an advantageous embodiment, the longitudinal elements are two rods oriented towards the output bottom roller, or in particular a corrugated profile. The profile can be, for example, a drawn profiled strip or a moulded profiled sheet. Such a longitudinal part is easy to manufacture and can, in particular, already have contours for securing the holder preferably in a movable manner.

Preferably, the suction tube and/or the holder are connected to a tensioning device for the sieve element, in particular an inclined element mounted elastically on the holder. The sieve element wrapped around the straw is preferably wrapped around the straw with a defined tension. The tensioning device arranged on the suction tube here ensures that the screen element is pretensioned uniformly on the suction tube in a well-defined manner.

In a preferred embodiment of the invention, the suction tube is arranged in particular detachably on a suction tube, which is in particular fastened to the drafting device. The suction tube is used to connect the suction tube to a suction source arranged in the spinning machine.

The suction tube is preferably arranged stationary on the drafting device. The suction tube thereby connects the suction tube to a suction source which is likewise arranged stationary in the spinning machine. Alternatively or additionally, the suction pipe can have a separation point, wherein the first part of the suction pipe is movably arranged on the drafting device or the spinning machine together with the suction pipe and the bearing shell, and the second part is stationary in the area of the bottom roller. , preferably elastically supported on the drafting device or spinning machine. A connection is thereby established between the movable bearing shell and the stationary part of the suction device arranged in the spinning machine. Alternatively, the suction tube can also be arranged on the holder in a movable or stationary manner. In the case of a stationary arrangement, it is necessary to establish a flexible connection with the suction device in the machine so that the mobility of the holder is not restricted.

If the rotation of the lever about the longitudinal part is limited by, in particular, an adjustable stop, damage to the parts arranged on the lever can be prevented. The stop also ensures that the suction tube stays in one position when the drafting device is in the open state, so that when the drafting device is closed, the suction tube can move again by itself to a predetermined position to form the second clamping point K2 .

If the lever is fixed in the longitudinal direction of the longitudinal member, the corresponding relationship of the lever to the corresponding compression device of the drafting device can be maintained.

Preferably, each suction pipe of adjacent drafting devices corresponds to a suction pipe, or two adjacent suction pipes lead into a common suction pipe, wherein the two suction pipes of adjacent drafting devices can be implemented as separate or connected to each other. Thereby, separate straws can be aspirated independently of adjacent straws. This enables individual suction of the compression device and, if necessary, an individual adjustment of the suction to the compression device. Alternatively, it can be provided that two adjacent suction pipes lead into a common suction pipe. This results in a structurally simple solution and is sufficient in most cases to achieve a uniform suction of two adjacent drafting or compression devices.

In the inventive compression device for a drafting device for a spinning machine and having a suction tube that can be sucked, the suction tube is arranged on a holder, and the holder has fixing means for rotatable and rotatable suction of the suction tube. /or slidably mounted on the longitudinal part of the spinning machine. As a result, the compression device can be arranged on the spinning machine, so that the compression device can be added to an existing drafting device. This is particularly advantageous in cases where existing spinning machines need to be retrofitted and the drafting device needs to be improved with a new type of compression device.

Description of drawings

Further advantages of the present invention are illustrated in the examples that follow. in:

Fig. 1 is the longitudinal section schematic diagram of spinning machine;

Figure 2 is a side view of the compression device;

Figure 3 is a side view of another compression device;

Figure 4 is a side view of another compression device;

FIG. 5 is a schematic top view of a plurality of compression devices as shown in FIG. 4;

Figure 6 is a tilting device for the compression device shown in Figure 4;

Figure 7 is a front view of two parallel adjacent drafting devices with separate compression devices; and

Figure 8 is a front view of two parallel adjacent drafting devices with a common compression device.

Detailed ways

In the following description of alternative embodiments, features that are identical and/or at least similar in design and/or mode of operation are designated by the same reference numerals. If these features are not reiterated in detail, their design and/or mode of operation is identical to that of the features already described in the preceding paragraphs.

FIG. 1 shows a schematic longitudinal section of a spinning machine, in particular a ring spinning machine with a compression device 20 . The figures schematically show several components of the spinning machine, namely the drafting device 2 and the spinning device 10 . The drafting device 2 is composed of three pairs of rollers, an input roller pair 3 , a belt roller pair 4 and an output roller pair 5 . The output roller pair 5 is formed by the output top roller 6 and the output bottom roller 7 . The two rollers of a pair of rollers abut together and form a pinch point at their contact point, wherein the pinch point K1 is formed by the pair of output rollers 5 between the upper output roller 6 and the lower output roller 7 . The clamping point K2 is formed by the suction pipe 17 ( FIG. 2 ) which can be sucked pressed against the top roller 6 . The fiber aggregates 1 entering the drafting device 2 are clamped between the rollers of the roller pairs 3 , 4 and 5 by clamping points and are drawn on the basis of the different rotational speeds of the roller pairs 3 , 4 and 5 . The fiber aggregate 1 is conveyed through the drafting device 2 while being drafted. After leaving the drafting device 2, the drafted fiber aggregate 8 reaches a compression device 20 and is compressed therein. Between the clamping points K1 and K2 , a fiber bundling region is provided on the suction tube 17 with suction slits, in which fiber bundling regions the fibers of the fiber assembly 8 are bundled or compressed. Next, the fiber aggregate 8 reaches the thread guide 9 and is further guided to the spinning device 10 . The spinning device 10 is mainly composed of a ring plate 14 carrying the spinning ring 12 and a main shaft rail 15 on which the reel 13 is fixed. The fiber aggregate 8 reaches the reel 13 via the rotor 11 . In order to weave the fiber aggregates 8 , the reel 13 is rotated, which causes the rotor 11 to also be rotated by the fiber aggregates 8 on the ring 12 . The fiber aggregate 8 is rotated by the rotation of the reel 13 and the rotor 11 to form a yarn, and the yarn is wound around the reel 13 by the up-and-down movement of the annular plate 14 .

To open the drafting device 2, the top roller can be lifted from the bottom roller. In order to close the drafting device again, the load arm 19 on which the top roller is fastened in a known manner is moved in the direction of the arrow P about the fulcrum D.

FIG. 2 shows a side view of the compression device 20 in the region of the output roller pair 5 . The top roller 6 is pressed against the output bottom roller 7 and forms a clamping point K1 with the output bottom roller. Here, the top roller 6 is fastened to the load arm 19 in a known manner by means of the load unit 26 . With the load arm 19 closed, the output top roller 6 is pressed against the output bottom roller 7 by means of the load spring 27 . In this embodiment, the load unit 26 is fastened to the load arm 19 by means of fastening elements, shown briefly in the figures, such as clamping screws, which can be slid in the elongated holes and be fastened therein. Said fixing element allows in particular the sliding of the load unit 26 inside the elongated hole. The position of the suction tube 17 relative to the output top roller 6 and relative to the output bottom roller 7 can be changed by displacing the fixing element inside the elongated hole and then being fixed in the position reached after the displacement. Therefore, the optimal setting of the suction pipe 17 relative to the output bottom roller 7 and the position of the clamping point K2 on the output top roller 6 are adjustable. This makes it possible to cope with the different fiber materials of the fiber aggregate 8 and to find the optimum settings for this. Furthermore, it is ensured that the position of the compression device 20 remains unchanged when the load arm 19 is lifted to open the drafting device 2 . During this process, the arrangement of the suction pipe 17 relative to the pair of delivery rollers 5 , in particular to the lower delivery roller 7 , is not changed.

The clamping point K2 is formed between the top roller 6 and the suction pipe 17 , wherein the suction pipe 17 is pressed against the output top roller 6 by means of the spring 21 . The suction pipe 17 has a suction slot 32 through which air is drawn in. The fiber aggregates 8 are bundled and compressed at the suction slits 32 . In order to prevent the fibers of the fiber aggregate 8 from being sucked into the suction slot 32 , the suction slot 32 is surrounded by the screen element 18 . The sieve element 18 is wound around the suction tube 17 and is tensioned by means of the tensioning device 22 . In the present embodiment, the tensioning device 22 is fastened to the suction tube 17 or the suction tube holder 23 . As a result, the tensioning device 22 can be moved together with the suction tube 17 , so that the movement of the suction tube 17 has no effect on the tensioning of the screen element 18 .

The suction pipe 17 is connected to the suction pipe 24 . Air is sucked from the suction pipe 17 via the suction pipe 24 . The suction tube 17 and the suction tube 24 may be embodied in one piece as a structural unit, or as shown here, the suction tube may be flexible, eg a flexible hose. In this embodiment, the suction tube 17 , the tensioning device 22 and the suction tube 24 are fastened to the suction tube holder 23 . The suction pipe 17 and the suction pipe 24 are preferably detachably connected to each other, so as to facilitate the removal of possible dirt, specifically, to separate the suction pipe 17 from the suction pipe 24, so as to facilitate cleaning the inner cavity of the suction pipe 17 and the suction pipe 24 . The suction tube 17 is preferably inserted into the opening of the suction tube 24 or the suction tube holder 23 and the suction tube is fixed there, if necessary, for example by means of screws.

The suction tube 24 is preferably detachably connected to the second part of the suction tube 30 in an elastic manner or by means of an elastic connection. The second part of the suction tube 30 is fastened in particular to the frame 28 by means of clips 31 , in particular to the longitudinal part of the frame 28 or to the drafting device 2 and leads to the drafting device 2 or the spinning machine suction source. The second part of the suction tube 30 is arranged stationary and does not have to be designed to be movable. However, in order for the suction pipe 17 to be able to move about the axis of the output bottom roller 7, the connection or suction pipe 24, 30 itself must be embodied elastically.

In order to be able to preserve the arrangement of the compression device 20 when the upper roller is lifted from the lower roller by means of the load arm 19, the suction pipe holder 23 and thus the suction pipe 17 are arranged on the machine frame. For this purpose, the straw holder 23 is fastened to the spring 21 which in turn is fastened to the frame 28 . The spring 21 (here, a leaf spring) presses the suction pipe 17 against the output top roller 6 with a predetermined force. Thus, the suction tube 17 rotates around the fixed location of the spring 21 on the frame. The spring 21 thus forms a deflectable holder for the suction tube 17, whereby the suction tube 17 is rotatably supported on the frame.

The top rollers 6 of the two parallel drafting units 2 are usually fastened to a load arm 19 . The top roller 6 is arranged on the load cell 26 of the load arm 19 by means of a shaft 29 in the manner of a tandem roller. Each top roller 6 protrudes laterally out of the load arm 19 . Accordingly, the two compression devices 20 of adjacent drafting devices 2 preferably also correspond to one load arm 19 . The two compression devices 20 can be implemented as one structural unit. However, the two compression devices can also be constructed separately and thus also individually correspond to each drafting device 2 .

Alternatively, the holder of the suction tube 17 , which is designed as a spring 21 , can also be fastened to a profile (longitudinal part) of the spinning machine extending in the longitudinal direction of the spinning machine. The profile may be a moulded (eg extruded or rolled) profiled sheet. However, the longitudinal part can also be one or several rods, for example arranged between the punches.

In the embodiment of FIG. 3 , the spring 21 still presses the suction tube 17 against the output top roller 6 with a predetermined force. For this purpose, the spring 21 is fastened to the clip 31 and the bearing seat 40 . In this case, a rotatable adjusting roller 41 is fastened on the bearing base 40 , by means of which the rotation of the adjusting roller can adjust the bias of the spring 21 . The clip 31 is embodied vertically movable along the guide 42 . If this guide allows the clip 31 to swim slightly, not only a vertical movement of the holder 25 is possible, but also a slight inclination so that the suction pipe 17 can precisely fit the axial orientation of the pair of output rollers 5 . In this embodiment, the supports 40 and guides 42 are arranged on the frame 28 . A certain elasticity of the clamping point K2 is obtained by this spring device, so that, for example, when encountering a thick section of the fiber assembly 8, there is no need to worry about damage to the compression device 20, since the compression device can be avoided against the spring pressure.

The suction tube 24 is fixed in the clip 31 . The suction tube 24 is of rigid design. In order to flexibly match the suction device on the machine side without restricting the mobility of the suction pipe 24 and the suction pipe 17 , the second part of the suction pipe 30 adopts a flexible design.

The screening element 18 is wound around the suction tube 17 and the tensioning rod 44 which is biased by means of a compression spring 43 . The compression spring 43 of the tensioning rod 44 is supported on the suction pipe 24 . In another embodiment, it can also be supported on the clip 31 or another part of the compression device 20 that moves together with the suction tube 17 .

FIG. 4 shows a side view of another embodiment of the compression device 20 . The suction tube 17 is arranged in the suction tube holder 23 on the rigid suction tube 24 . The suction pipe 24 is provided with a bearing 45 which carries a tensioning rod 44 for the screen element 18 . The tensioning rod 44 is biased relative to the suction tube 24 by means of a compression spring 43 .

A lever 25 is also provided on the suction pipe 24 . The lever 25 partially encloses a longitudinal part 46, which here is constructed as a profile and extends along several drafting devices. A stop 47 and a bearing point 48 for the lever 25 are provided on the longitudinal part 46 . When the lever 25 is rotated about the bearing point 48, a fulcrum DS for the drinking straw 17 is created. A stop 47 is provided to limit the rotational movement.

The spring 21 arranged between the longitudinal part 46 and the suction pipe 24 presses the suction pipe 17 against the output top roller 6 and thus produces a clamping point K2. The rotational movement of the suction tube 24 and the suction tube 17 takes place around the fulcrum DS.

FIG. 5 shows a schematic top view of several compression devices 20 as shown in FIG. 4 . Each drafting device schematically shows one output top roller 6 and one suction pipe 17 . Two adjacent drafting devices are arranged on one load arm and carry an output top roller 6 constructed as a double roller. Each of the two compression devices 20 corresponds to a suction pipe. The longitudinal member 46 is fixed between the two punches 48 . Four levers 25 are fastened to the longitudinal members for eight drafting devices. With this configuration, the compression device 20 can be fastened to the spinning machine in a particularly convenient manner.

FIG. 6 shows a cross-section of a tilting device for the compression device 20 shown in FIG. 4 . Accordingly, not only can the tiltable lever 25 be rotated about the fulcrum DS shown in FIG. 4 , the lever 25 can also be tilted according to the double-headed arrow K about a horizontal axis transverse to the longitudinal axis of the longitudinal part 46 . In order to allow the lever 25 to correspond precisely to the position of the drafting device in the axial direction, the nose 49 of the lever 25 is provided and corresponding recesses are provided in the longitudinal part 46 .

The lever 25 is constructed with a bevel in its edge region. This chamfer is designed such that the suction tube 17 fastened to the lever 25 is inclined vertically around the longitudinal axis of the longitudinal part 46 . In the horizontal direction, however, the lever 25 is fastened to the longitudinal part 46 without play or with at least a small play. In this way, the suction pipe 17 is allowed to tilt vertically, and the suction pipe 17 is always oriented parallel to the output bottom roller 7 in the horizontal direction. This tilting movement ensures that the suction tube 17 always rests precisely against the top output roller 6 . Especially in the case of a double unit, that is, if one lever 25 has one or two suction pipes 17 , 17 ′ for two adjacent drafting devices 2 , it is thereby ensured that the suction pipes 17 , 17 ′ are on the output Precise orientation of roller 6 surfaces. A reliable spinning operation is thereby achieved. Therefore, the lever 25 is both tiltable and rotatable and is mounted on the output bottom roller 7 so as to be slidable along the axis of the output bottom roller 7 .

7 and 8 show two variants of the compression device 20 . In both variants, two suction slots 32 , 32 ′ corresponding to the output top roller 6 of the drafting device 2 are shown. In FIG. 7 , the two suction pipes 17 , 17 ′ of adjacent drafting devices of one load arm 19 are arranged independently of each other. Each suction tube 17, 17' is connected to a suction tube 24, 24' so that a negative pressure can be applied in the respective suction slot 32, 32'. Each suction pipe 17 , 17 ′ can lead into its own suction pipe 30 , or these suction pipes can be connected to a common suction pipe 30 .

The suction tube holders 23 , 23 ′ are respectively arranged in two bearing pads 50 , 50 ′, which are connected by means of holders 25 , 25 ′ fastened to the frame 28 . The bearing shells 50 and 50' are respectively provided with springs 21 and 21' which can make the straw holders 23 and 23' move vertically upward. By this movement, the suction pipes 17, 17' are pressed against the output top rollers 6, 6'. The holders 25, 25' allow different deflections of the suction tube holders 23, 23' and also allow the suction tube holders 23, 23' to be tilted slightly so that the suction tubes 17, 17' can precisely fit the output top rollers. A particularly good fit with the respective output top rollers 6, 6' is achieved by the independent mounting of the two suction tube holders 23, 23'.

A tensioning rod 44, 44' is provided on each holder 25, 25' for tensioning the screen elements 18, 18' by means of a compression spring not shown in the figures. Thereby, the screening elements 18, 18' extend around the drinking straws 17, 17' in the tensioned state.

FIG. 8 shows a second variant of the straw holder 23 . In this variant, a single drinking straw 17 with two suction slits 32, 32' is provided in the drinking straw holder 23. The two suction slits 32 , 32 ′ are jointly sucked by a suction pipe 24 . Unlike the embodiment according to FIG. 7 , it is thus not easy to achieve an individual adjustment of the two negative pressures on the suction slits 32 , 32 ′. The device structure has been simplified.

The central spring 21 , here designed as a helical spring, presses against the suction tube 24 . In this way, the suction tube holder 23 is pushed up together with the suction tube 17 , so that a clamping point K2 for the fiber aggregate 8 is formed between the suction tube 17 and the output top rollers 6 , 6 ′. When the drafting device 2 is opened, ie when the top roller moves away from the bottom roller, the suction pipe 17 remains in the two bearing shells 50, 50'. In order to avoid accidental ejection of the suction tube 17 from the bearing shells 50 , 50 ′, as in the embodiment shown in FIG. 7 , either the bearing shells 50 , 50 ′ can be constructed high enough, or a stopper can be provided to stop the suction tube 17 in time. When the drafting device 2 is closed again, the clamping points K1 and K2 are obtained in the aforementioned manner. This ensures that the fiber assembly 8 is reliably spun or drawn without having to readjust, for example, the spring pressure of the spring 21 on the support element 40 .

In order to ensure that the suction tube 17 presses the two output top rollers 6, 6' particularly uniformly, further springs 21.1, 21.2 are provided in each bearing shell 50, 50'. These springs 21.1, 21.2 provide support for the central spring 21 and enable the suction tube 17 to be pressed against the output top rollers 6, 6' particularly well.

The device is constructed in accordance with the above description, wherein the mentioned features may be present individually but also in any combination.

The present invention is not limited to the above-described embodiments shown in the drawings. Modifications are also possible within the scope of the claims, eg combining features present in different embodiments.

Description of reference numerals

1 fiber assembly

2 Drafting device

3 input roller pair

4 belt roller pairs

5 output roller pairs

6 output top roller

7 Output bottom roller

8 Drawn fiber aggregates

9 Thread guide

10 Spinning unit

11 Rotor

12 Ring

13 reels

14 Ring Plate

15 Spindle track

16 Fiber bundle area

17 Straws

18 Sieve elements

19 Load arm

20 Compression device

21 spring

22 Tensioner

23 Straw holder

24 Suction tube (first part)

25 Holder, lever

26 load cells

27 Load spring

28 racks

29 axes

30 Suction tube (second part)

31 clips

32 Suction seam

40 Support seat

41 Adjusting the roller

42 Guide

43 Compression spring

44 tension rod

45 Bearings

46 Longitudinal parts

47 Stop

48 Punch

49 Nose

50 bearing

51 Adjustment element

D Pivot of load arm

P Movement of the load arm

K tilt motion

The fulcrum of the DS straw

K1 First clamping point

K2 Second clamping point

Claims (17)

1. A spinning machine having a plurality of drafting devices (2), the drafting devices respectively have: top and bottom rollers, and a load arm (19) on which the top roller of the drafting device (2) is arranged, a pair of output rollers (5), formed by a top output roller (6) and a bottom output roller (7), and a longitudinal member (46) extending substantially parallel to the output bottom roller (7), a pneumatic compression device (20) located downstream of the output roller pair (5) of the drafting device (2), for compressing the drawn fiber aggregate (8), the compression device has a suction tube (17) that can be sucked, and Said straw (17) is wrapped by a screening element (18), It is characterized in that, The suction pipe (17) is arranged on the holder (25) fixed on the frame (28), the suction tube (17) is rotatably mounted about a bearing point (48) and/or slidably mounted along a guide (42), and The suction pipe (17) in the holder (25) and/or the holder (25) on the frame (28) are mounted to be tiltable about a tilting axis oriented transverse to the axis of the output bottom roller (7) , so as to be oriented parallel to the axis of the output bottom roller (7). 2. Spinning machine according to claim 1, characterized in that the holder (25) is a deflectable lever arranged on a longitudinal part (46) of the spinning machine. 3. Spinning machine according to claim 1 or 2, characterized in that spring means are provided which act on the suction tube (17) and/or the holder (25) in order to make all the The suction pipe (17) is elastically pressed against the output upper roller (6). 4. The spinning machine according to claim 1, characterized in that, the compression device (20) has a fiber bundle region (16), and The fiber bundle area (16) is defined by two clamping points (K1, K2), Wherein the first clamping point (K1) is defined by the two rollers of the output roller pair (5), and the second clamping point (K2) is formed by one roller and the screening element (18), the roller is one of the two rollers of the output roller pair (5). 5. Spinning machine according to claim 1, characterized in that the holder (25) accommodates one or two suction tubes (17). 6. Spinning machine according to claim 3, characterized in that the spring means are supported on the frame (28) and/or on the holder (25). 7. Spinning machine according to claim 3, characterized in that the spring arrangement has at least one compression spring (21) and/or at least one torsion spring (21) in order to keep the suction tube (17) constant The linear load compresses one output top roller (6) or two adjacent output top rollers, or the output bottom roller (7). 8. The spinning machine according to claim 3, characterized in that, The spring device is arranged centrally on one suction pipe or between two suction pipes (17), or In each case at least one spring device is arranged beside one or both of the drinking straws (17). 9. Spinning machine according to claim 3, characterized in that the spring means are arranged such that the one or both suction tubes (17) are pressed against the pair of output rollers (17) along a longitudinal guide 5) One Rolla. 10. Spinning machine according to claim 1, characterized in that the longitudinal members (46) are two rods oriented towards the output bottom roller (7). 11. Spinning machine according to claim 1, characterized in that the suction tube (17) and/or the holder (25) and the tensioning device (22) for the screen element (18) ) connection, the tensioning device is elastically mounted on the inclined element on the holder (25). 12. Spinning machine according to claim 1, characterized in that the suction pipe (17) is arranged on a suction pipe (24) which is fixedly arranged on the drafting device ( 2) on. 13. Spinning machine according to claim 1, characterized in that the suction pipe (24) is arranged on the holder (25). 14. Spinning machine according to claim 1, characterized in that the rotation of the holder (25) about the longitudinal member (46) is limited by an adjustable stop (47). 15. Spinning machine according to claim 1, characterized in that the holder (25) is fixed in the longitudinal direction of the longitudinal member (46). 16. The spinning machine of claim 1, wherein Each suction pipe (17) of adjacent drafting devices (2) corresponds to one suction pipe (24), or Two adjacent suction pipes (17) lead to a common suction pipe (24), The two suction pipes ( 17 ) of adjacent drafting devices ( 2 ) can be implemented separately or connected to each other. 17. A compression device for a drafting device of a spinning machine according to any one of claims 1-16, with a suction pipe (17) that can be sucked, It is characterized in that, The straw (17) is arranged on the holder (25), and The holder (25) has fixing means for rotatably and slidably mounting the suction tube (17) on the longitudinal part (46) of the spinning machine.

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