阅读说明：本技术 用于纺纱机的牵伸装置和压缩装置 (Drafting and compression device for spinning machine ) 是由 G·斯塔莱克 G·沙夫勒 C·比安科 于 2018-12-06 设计创作，主要内容包括：一种用于纺纱机的用于牵伸纤维集合体(8)的牵伸装置,具有：上罗拉和下罗拉以及负荷臂(19),在所述负荷臂上布置有所述牵伸装置(2)的上罗拉；由输出上罗拉(6)与布置在其下方的输出辊(7)构成的输出罗拉对(5)；和设于所述牵伸装置(2)的输出罗拉对(5)下游的用于将所述经牵伸的纤维集合体(8)压缩的气动的压缩装置(20),所述压缩装置具有可被抽吸的抽吸管(17)。所述抽吸管(17)布置在支承盘(25)上,所述支承盘(25)支承在所述输出辊(7)上。在用于牵伸装置并且具有可被抽吸的抽吸管(17)的压缩装置中,所述抽吸管(17)是布置在支承盘(25)上,以及,所述支承盘(25)被设置成支承在所述输出辊(7)上。(A drafting device for drafting a fiber aggregate (8) for a spinning machine, comprising: top and bottom rollers and a load arm (19) on which the top roller of the drafting device (2) is arranged; a delivery roller pair (5) consisting of a delivery upper roller (6) and a delivery roller (7) arranged below the delivery upper roller; and a pneumatic compression device (20) which is arranged downstream of the delivery roller pair (5) of the drafting device (2) and is used for compressing the drafted fiber assembly (8), wherein the compression device is provided with a suction pipe (17) capable of being sucked. The suction pipe (17) is arranged on a support disk (25), the support disk (25) being supported on the delivery roller (7). In a compression device for a drafting device and having a suction tube (17) which can be sucked, the suction tube (17) is arranged on a support disc (25), and the support disc (25) is provided to be supported on the delivery roll (7).)

1. A drafting device for drafting a fiber aggregate (8) for a spinning machine has

Upper and lower rollers, a load arm (19) on which the upper roller of the drafting device (2) is arranged,

a delivery roller pair (5) consisting of a delivery top roller (6) and a delivery roller (7) arranged thereunder, and

a pneumatic compression device (20) which is arranged downstream of the delivery roller pair (5) of the drafting device (2) and which compresses the drafted fiber aggregate (8), the compression device (20) having a suction tube (17) which can be sucked,

it is characterized in that the preparation method is characterized in that,

the suction pipe (17) is arranged on a support disc (25), an

The support disk (25) is supported on the delivery roller (7).

2. Drafting device according to claim 1, characterised in that the suction pipe (17) is surrounded by a screening element (18).

3. Drafting device as in one or more of the preceding claims,

the compression device (20) has a fiber bundling zone (16),

the fiber bundling zone (16) is delimited by two clamping points (K1, K2),

wherein a first clamping point (K1) is defined by two rollers of the delivery roller pair (5),

the second clamping point (K2) is formed by one of the two rollers (6, 7) of the delivery roller pair (5) and the screen element (18).

4. Drafting device according to one or more of the preceding claims, characterised in that the support disc (25) is rotatably mounted about the axis of the output roller (7) and/or is movably mounted along the axis of the output roller (7) and/or is tiltably mounted perpendicular to the axis of the output roller (7).

5. Drafting device according to one or more of the preceding claims, characterised in that spring means are provided which act on the suction tube (17) and/or on the support disc (25) in order to press the suction tube (17) elastically against one of the two rollers of the delivery roller pair (5).

6. A drafting device as claimed in any one or more of the preceding claims, characterised in that the spring means are supported on the machine frame (28).

7. Drafting device according to one or more of the preceding claims, characterised in that the support disc (25) accommodates two, in particular connected, suction pipes (17, 17'), or one suction pipe (17) for two adjacent drafting devices (2).

8. Drafting device according to one or more of the preceding claims, characterised in that the bearing disc (25) is supported laterally on the delivery top roller (6).

9. Drafting device according to one or more of the preceding claims, characterised in that the support disc (25) loops around the delivery roller (7) from top to bottom and/or from bottom to top and preferably clamps onto the delivery roller (7).

10. Drafting device according to one or more of the preceding claims, characterised in that the support disc (25) is assigned a traversing device (43, 44).

11. Drafting device according to one or more of the preceding claims, characterised in that the suction pipe (17) is connected to a tensioning element (22) for the screening element (18).

12. Drafting device according to one or more of the preceding claims, characterised in that the suction tube (17) is arranged on a suction tube (30), in particular detachably connected to the suction tube (30).

13. Drafting device as in one or more of the preceding claims,

the draft tube (30) is arranged stationary on the drafting device (2) and/or

The draft tube (30) has a separation point, wherein a first part (24) of the draft tube is movable together with the draft tube (17) and the support disk (25), and the second part (30) is arranged on the drafting device (2) in a stationary, at most elastically supported manner by the lower roller.

14. Drafting device as in one or more of the preceding claims,

two suction pipes (30) for two adjacent suction pipes (17, 17') are arranged at the side of the supporting disk (25), or

Two adjacent suction pipes (17, 17') communicate with a common suction pipe (30).

15. A compression device for a drafting device, in particular according to one of the preceding claims, having a suction tube (17) which can be sucked,

it is characterized in that the preparation method is characterized in that,

the suction pipe (17) is arranged on a support disc (25), an

The support disc (25) is arranged to be supported on the output roller (7).

Technical Field

The invention relates to a drafting device for drafting a fibre aggregate for a spinning machine, having a top roller and a bottom roller, having a load arm on which the top roller of the drafting device is arranged, having a delivery roller pair consisting of a delivery top roller and a delivery roller arranged thereunder, and having a pneumatic compression device for compressing the drafted fibre aggregate, which is arranged downstream of the delivery roller pair of the drafting device, the compression device having a suction tube that can be sucked, and to a compression device for the drafting device and having a suction tube that can be sucked.

Background

A drafting device for a spinning machine comprises at least two roller pairs between which a fibre aggregate (Faserverband) is drafted on the basis of the different rotational speeds of the roller pairs. When the fiber assembly drafted is separated from the draft device by the pair of rollers and sent to the spinning device, the pair of rollers is called a delivery roller pair. The delivery roller pair is composed of a delivery upper roller and a delivery lower roller or delivery rollers, and the delivery upper roller and the delivery lower roller form a clamping point for the fiber aggregate to pass through. The device for compressing the drafted fiber aggregate is arranged downstream of the delivery roller pair. Wherein mechanical or pneumatic compression means may be employed.

Devices of the same type are known from the prior art and are used for compressing fiber strands after a drawing process in spinning machines. A corresponding device is described, for example, in DE 10050089 a 1. The compression device disclosed in this case is of the pneumatic type and is mainly composed of a suction shoe (sautschuh) and an apertured carrying member. Wherein a pressing element is attached to one of the pair of delivery rollers, which pressing element forms a second clamping point with the roller, with the exception of the clamping point between the delivery top roller and the delivery bottom roller. DE 10050089 a1 does not discuss the fixing of the pressing element in the spinning machine. The disadvantage of the proposed device is that the fibre aggregate can be compressed irregularly as a result of the pressing element accidentally abutting against the rollers of the delivery roller pair.

Another device of the same type is described in DE 10019436 a 1. The compression device disclosed therein is also of the pneumatic type, with a hollow profile and a perforated carrying member for the compression device. The fiber aggregate leaving the delivery roller pair of the drafting device is placed on a conveying member having a hole, and the fiber aggregate is guided through the hollow profile by the conveying member. The hollow profile can be pressed against one of the rollers by means of at least one press-fit element. The publication does not disclose how to construct this press-fit element and where to fix it. A disadvantage of such devices is that it is not yet ensured by only one press-fit element that the hollow profile is pressed against the roller in a defined manner. Furthermore, the pressing of the hollow profile to the delivery top roller in a defined manner is in this case dependent on the position of the delivery top roller, which in turn is dependent on the arrangement of the carrying pressure arm of the drafting device.

Disclosure of Invention

The object of the invention is to improve the known devices and to provide a compression device which is simple in construction and can be used in a single spinning position and which is distinguished by the fact that the fibre assembly can be compressed uniformly in a reliable manner.

The solution of the invention to achieve the above object is a drawing device and a compression device having the features of the independent claims.

The drafting device for a spinning machine according to the invention has a top roller and a bottom roller and a load arm, on which the top roller of the drafting device is arranged. The delivery roller pair is formed by a delivery upper roller and a delivery roller arranged below the delivery upper roller, and the delivery roller extends through a plurality of drafting devices arranged in parallel. A pneumatic compression device for compressing the drafted fiber aggregate is provided downstream of the delivery roller pair of the draft device. The compression device has a suction tube that can be suctioned.

According to the invention, the suction tube is arranged on a support disk which is supported on the delivery roller. The support disk enables the suction tube to be received and fixed in a defined manner. By arranging the support disk on the delivery roller in this way, the suction tube is arranged on the delivery top roller or delivery roller, so that the suction tube remains stationary on the drafting device as it opens, i.e. as 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 roller is maintained even after the draft device has been opened and reclosed. Thereby preserving the settings once implemented. This achieves a reliable and uniform compression of the fiber assembly. The support disc brings about a defined position of the suction tube, since it is fixed on the delivery roller, which is fixedly mounted on the spinning machine. The suction tube is arranged on the support disc. The output top roller and the suction pipe are connected through the supporting disc, so that the corresponding relation between the suction pipe and the output top roller or the output roller is realized. Thereby ensuring that the suction tube is evenly applied against the delivery upper or delivery roller. No angular deviation occurs between the suction tube and the delivery top roller or delivery roller, to be precise, they are parallel to each other and thus cause a uniform compression of the fibre assembly.

In an advantageous embodiment of the invention, the suction tube is enclosed by a screening element. In this way, the fibers in the fiber aggregate are not sucked through the suction pipe. The fiber assembly can be uniformly compressed and conveyed through a clamping point between the suction pipe and the output upper roller or the output lower roller. The screening element is preferably a screening belt or may be a screening roller.

In a particularly advantageous embodiment of the invention, the compression device has a fiber bundling zone, and the fiber bundling zone is delimited by two clamping points. The first nip point is defined by the two rollers of the delivery roller pair and the second nip point is formed by one of the two rollers of the delivery roller pair and the screening element. The fiber assembly is clamped at the two clamping points, and the fiber assembly is compressed at a suction pipe which causes suction to the fiber assembly located between the two clamping points.

Preferably, the support disc is rotatable about the axis of the output roller. The support disk can also be mounted movably along the axis of the delivery roller and/or tiltable perpendicular to the axis of the delivery roller. By means of this movable support, it is ensured that the suction tube optimally fits the two rollers of the delivery roller pair and is pressed uniformly against the delivery roller or delivery top roller.

In order to press the suction tube uniformly against the two rollers of the delivery roller pair, a spring device is advantageously provided, which acts on the suction tube and/or the support disk and presses the suction tube against the delivery upper roller or the delivery lower roller. In a preferred embodiment, the pressing force of the spring is adjustable, so that a uniform loading of the suction tube and thus a continuous and uniform compression of the fiber aggregate is achieved.

Preferably, the springs of the spring device are supported on the frame, so that a simple and inexpensive construction of the spring device is achieved.

In an advantageous embodiment of the invention, the support plate accommodates two (in particular connected) suction tubes. Each of the suction pipes corresponds to one of two adjacent drafting devices. The support plate arranged on the delivery roller supplies the negative pressure required by the compression device to two drawing devices arranged side by side (the upper roller of which is carried by the load arm) via a suction tube. In a particularly simple construction, the two suction pipes are connected pneumatically or a single suction pipe is provided for two adjacent drawing devices. This eliminates the need for two suction line connections for supplying the suction line with underpressure, but only one connection for simultaneously sucking the two adjacent suction locations.

In a preferred embodiment of the invention, the support disk is supported laterally on the delivery top roller. This allows a precise alignment and axial orientation of the support disks relative to the delivery roller pair in a simple manner. In the case of a lateral support with an insertion slope for the delivery top roller, the support disk can be automatically threaded and oriented relative to the delivery top roller when the drafting device is opened and reclosed.

In an advantageous embodiment, the support disk is designed such that it loops around the delivery roller from top to bottom and/or from bottom to top and preferably clamps on the delivery roller, so that the support disk is simply fixed to the delivery roller. At the same time, the support disk is fixed radially in a predetermined manner on the output roller and is thus easy to attach and remove again.

Preferably, the support disc is assigned a traversing device. The use time of the screening element can be prolonged by the transverse movement of the support disk in the axial direction of the delivery roller. The traversing may be performed by a traversing bar passing through the machine. The support plate is then used to move the suction tube and the screening element, preferably with all other fibre guide elements (such as feed hopper, intermediate field condenser, etc.), uniformly across.

Preferably, the suction pipe is connected to a tensioning element for the screening element. The screening element surrounding the suction pipe is preferably laid around the suction pipe with a defined tension. In this case, the tensioning device arranged on the suction pipe effects a defined uniform pretensioning of the screening element on the suction pipe.

In a preferred embodiment of the invention, the suction tube is arranged (in particular detachably) on the suction tube. The suction pipe is used for connecting the suction pipe with a suction source arranged in the spinning machine.

Preferably, the draft tube is arranged stationary on the drafting device. The suction tube is thereby connected to a suction source which is also arranged in the spinning machine at rest. Alternatively or additionally, the draft tube can have a separation point, wherein a first part of the draft tube is moved together with the draft tube and the support disk and a second part is arranged in the region of the bottom roller on the drafting device or spinning machine in a stationary, at most elastically supported manner. This produces a connection between the movable support disc and the stationary part of the suction device arranged in the spinning machine.

Preferably, two suction pipes for two adjacent suction pipes are provided at the side of the support plate. In this way, each suction duct can be sucked independently of the adjacent suction duct. This enables an independent and optionally also individually adjustable suction operation of the compression device. Alternatively, two adjacent suction pipes lead into a common suction pipe. This allows a simple structural solution and in most cases is sufficient to achieve a uniform suction of two adjacent drawing or compression devices.

In the compression device according to the invention for a drafting device and having a suction tube which can be sucked, the suction tube is arranged on a support plate and the support plate is arranged so as to be supported on the delivery roll. The compression device can therefore be arranged subsequently on the load arm, whereby a compression device is added to an existing drafting device. This is particularly advantageous when retrofitting of existing spinning machines is required and it is desirable to improve the drafting device by means of a new type of compression device.

Drawings

Further advantages of the invention are described in the following description of the embodiments. In the figure:

FIG. 1 is a schematic view in longitudinal section of a spinning machine,

figure 2 is a side view of the compression device,

figure 3 is a side view of another compression device,

figure 4a is a side view of a compression device with tiltable support discs,

figure 4b is a cross-sectional view of the support tray of figure 4a,

figure 5a shows a support disc with two aspiration means,

figure 5b shows a support disc with an aspiration device,

figure 6 is a side view of another compression device,

FIG. 7a is a partial view of the compression device of FIG. 3, an

FIG. 7b is a top view of the restraint fork of FIG. 7 a.

Detailed Description

In the following description of alternative embodiments, the same reference numerals are used for features that are identical and/or at least similar in technical solution and/or operating principle. Unless otherwise stated, the technical solutions and/or the operating principles of these features are equivalent to those of the features already described above.

Fig. 1 is a schematic view in longitudinal section of a spinning machine, in particular a ring spinning machine, with a compression device 20. The drawing shows exemplary components of a spinning machine, namely a drafting device 2 and a spinning device 10. The draft device 2 is composed of three roller pairs, i.e., a feed roller pair 3, a belt roller pair 4, and a delivery roller pair 5. The delivery roller pair 5 is formed by a delivery upper roller 6 and a delivery roller 7. The two rollers of one roller pair come together and form a nip point at their contact point, wherein the nip point K1 is formed by the delivery roller pair 5 between the delivery top roller 6 and the delivery roller 7. The clamping point K2 is formed by a suction tube 17 (fig. 2) which can be sucked and which is pressed against the top roller 6. The fiber aggregate 1 entering the drafting device 2 is clamped between the rollers of the roller pairs 3, 4 and 5 by a clamping point and drafted based on the different rotational speeds of the roller pairs 3, 4 and 5. The fiber assembly 1 is conveyed through the draft device 2 while being drafted. After leaving the drafting device 2, the drafted fiber aggregate 8 reaches a compression device 20, where the fiber aggregate is compressed. Between the pinch points K1 and K2, the suction tube 17 having the suction slit is provided with a fiber collecting zone in which fibers of the fiber aggregate 8 are collected or compressed. The fibre aggregate 8 then 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 that carries a spinning ring 12, and a spindle rail 15 to which a spool 13 is fixed. The fiber assembly 8 reaches the reel 13 via the rotor 11. To weave the fiber aggregate 8, the reel 13 is rotated, which causes the rotor 11 to be rotated by the fiber aggregate 8 on the ring 12 as well. The fiber assembly 8 is rotated by the rotation of the spool 13 and the rotor 11, thereby forming a yarn, which is wound around the spool 13 by the vertical movement of the ring rail 14.

To open the drafting device 2, the top roller can be lifted off the bottom roller. For this purpose, and for reclosing the drafting device, the load arm 19, to which the top roller is fixed in a known manner, is moved about the rotation point D in the direction of the arrow P.

Fig. 2 is a side view of the compression device 20 in the region of the delivery roller pair 5. The top roller 6 is pressed onto the delivery roller 7 and forms a nip point K1 with this delivery roller. The top roller 6 is fixed in a known manner to the load arm 19 by means of a load assembly 26. With the load arm 19 closed, the delivery top roller 6 is pressed against the delivery roller 7 by the load spring 27. In this embodiment, the load assembly 26 is secured to the load arm 19 by means of a securing element, such as a clamping screw, which is movable and secured in an elongated hole. The securing element in particular allows movement of the load assembly 26 within the elongate bore. By adjusting the fixing element in the elongated hole and subsequently fixing the fixing element in the adjusted position, the position of the suction tube 17 can be changed relative to the output top roller 6 and the output roller 7. This allows an optimum adjustment of the suction tube 17 relative to the delivery roller 7 and also of the position of the clamping point K2 on the delivery top roller 6. This makes it possible to cope with different fibre materials of the fibre assembly 8 and to find an optimum arrangement for them. Furthermore, opening the drafting device 2 by lifting the load arm 19 also ensures that the positioning of the compression device 20 remains unchanged. The arrangement of the suction pipe 17 relative to the delivery roller pair 5, in particular relative to the delivery roller 7, remains unchanged.

A clamping point K2 is produced between the top roller 6 and the suction tube 17, which is pressed by the spring 21 against the output top roller 6. The suction duct 17 has a suction slit 32, through which air is sucked. The fiber assembly 8 is bundled and compressed on the suction slit. 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 screen element 18 surrounds the suction pipe 17 and is tensioned by means of a tensioning device 22. In the present exemplary embodiment, the tensioning device 22 is fastened to the suction tube 17 or the suction tube holder 23. In this way, the tensioning device 22 can move together with the suction tube 17, so that the movement of the suction tube 17 does not affect the tensioning of the screening element 18.

The suction pipe 17 is connected to a suction pipe 24. Air is sucked out of the suction tube 17 through the suction tube 24. The suction pipe 17 and the suction pipe 24 can be embodied in one piece in one structural unit. In the present exemplary embodiment, the suction tube 17, the tensioning device 22 and the suction tube 24 are fastened to the suction tube holder 23 or are embodied as a single structural unit. However, the suction pipe 17 is preferably detachably connected to the draft pipe 24, so that any dirt that may be present can be easily removed, in that the suction pipe 17 is removed from the draft pipe 24, so that the suction pipe 17 and the draft pipe 24 are easily accessible for cleaning. Preferably, the suction tube 17 is inserted into an opening of the suction tube 24 or an opening of the suction tube holder 23 and optionally fastened there by means of, for example, screws.

In order to keep the arrangement of the compression device 20 unchanged when the top roller together with the load arm 19 is lifted from the bottom roller, a suction tube holder 23 and a suction tube 17 are arranged on the delivery roller 7. For this purpose, the suction tube holder 23 is fixed to the delivery roller 7 so as to be rotatable about its rotational point DS and the support disk 25. The support disk 25 is arranged fixedly on the suction tube holder 23, so that the suction tube 17 is indirectly fixed to the support disk 25. The suction duct 17 thus rotates about the axis of the output roller 7. For this purpose, the support disk 25 loops the output roller 7 from top to bottom. The support disk 25 can be of a resilient embodiment in order to simply clamp it on the output roller 7 and remove it. The support disc is movable along the axis of the output roller. In order to be able to perform a precise positioning on the delivery top roller 6, it is preferably designed such that the bearing disk 25 is supported laterally on the delivery top roller 6.

The spring 21 presses the suction pipe 17 against the output top roller 6 with a predetermined force. For this purpose, the spring 21 is supported on the bearing disk 25 by means of a bearing element 40 which has a spring receptacle 42 for accommodating the spring. The counter-support 41 for the spring 21 is fixed to the frame 28 of the drafting device 2 or spinning machine. A certain elasticity of the clamping point K2 is achieved by this spring device, so that, for example, in the case of a solid nub of the fiber aggregate 8, there is no need to worry about damage to the compression device 20, since this can be moved back against the spring pressure.

Usually, two parallel top rollers 6 of the drafting system 2 are fixed to the load arm 19. These top rollers 6 are arranged in the form of double-row rollers on the load assembly 26 of the load arm 19 by means of an axis 29. Each of the top rollers 6 laterally projects a load arm 19. Accordingly, the two compression devices 20 of adjacent drafting devices 2 preferably also correspond to a load arm 19. The two compression devices 20 can be embodied as one structural unit. But it can also be constructed separately and thus correspond to each drafting device 2 separately.

In the embodiment shown in fig. 2, each suction pipe 17 of the drafting device 2 has a suction pipe 24. One load arm 19 corresponds to two suction pipes 17 and two suction pipes 24. Each of which is fastened together with the tensioning device 22 to its own suction tube holder 23 and to a support disk 25 and carries a screening element 18. The suction tube holder 23 or the bearing disk 25 is rotatably arranged on the load assembly 7. Each draft tube 24 is preferably detachably connected to the second portion of draft tube 30 by means of a flexible connection, here a flexible connection hose 33. The second part of the draft tube 30 is fastened to the frame 28 or the drawing frame 2 with a clamp 31 and leads to the drawing frame 2 or the suction source of the spinning machine. The second part of the draft tube 30 is arranged stationary and does not have to be embodied as movable. However, in order to be able to move the suction pipe 17 about the axis of the output roller 7, the connecting or suction pipe 24, 30 itself must be elastic.

According to the embodiment shown in fig. 3, the support disk 25 loops around the output roller 7 from top to bottom and is clamped thereto. A traversing device is fixed to the support plate 25. The traversing device has a traversing bar 43 extending along the machine, which performs a back and forth movement. A traverse tongue 44 is arranged on the traverse bar 43 and serves to connect the traverse bar 43 to the support disk 25. On the traverse tongue 44, for example, a feed hopper 45 for the fibre assembly 8 and optionally further fibre guiding devices are arranged. By the transverse movement of the transverse movement rod 43, the feed hopper 45 and the support disk 25 with the suction tube 17 arranged thereon move back and forth. The wear of the drafting device rollers is thereby reduced, since the fibre assembly 8 is not always clamped in the same position on the drafting device rollers. Thus, the service life of the drafting device roller can be greatly prolonged.

A support element 40 is also arranged on the support disk 25. In contrast to the embodiment shown in fig. 2, the support element 40 is here oriented downwards. The spring 21, which is designed in the form of a leaf spring, is pressed against the bearing element 40. As a result, the support plate 25 together with the suction pipe 17 is pressed upward, and a nip point K2 for the fiber aggregate 8 is formed between the suction pipe 17 and the delivery top roller 6. In the case of opening the drafting device 2, i.e. in the case of removing the top roller from the bottom roller, the suction tube 17 remains essentially in the same position as before, since the support disk 25 is still clamped on the lower output roller 7. When the drafting device 2 is reclosed, the clamping points K1 and K2 are obtained in the same way as before. This ensures that the fibre assembly 8 is reliably spun or drafted without, for example, a resetting in respect of the spring pressure applied by the spring 21 to the support element 40.

Fig. 4a is a side view of a compression device with tiltable support disc 25, and fig. 4b is a corresponding cross-sectional view of the support disc shown in fig. 4 a. According to fig. 4a and 4b, the support disk 25 is designed such that a bevel 46 is provided in its edge region. This bevel 46 is designed in such a way that it enables the suction tube 17 fastened to the support disk 25 to be tilted in the vertical direction about the longitudinal axis of the delivery roller 7. In the horizontal direction, the support disk 25 is fixed to the delivery roller 7 without play or at least with a very small play. This enables the suction duct 17 to be inclined in the vertical direction, while in the horizontal direction the suction duct 17 is always oriented parallel to the output roller 7. By this tilting movement, indicated by the double arrow K in fig. 4b, it is ensured that the suction tube 17 always bears precisely against the output top roller 6. In particular in the case of a double assembly, i.e. in the case of a support disk 25 with one or two suction tubes 17, 17 'for the two adjacent drafting devices 2, precise alignment of the suction tubes 17, 17' on the surface of the delivery upper roller 6 is thereby ensured. This enables a reliable spinning operation. The support disk 25 is therefore supported on the output roller 7 in a tiltable, rotatable and likewise displaceable manner along the axis of the output roller 7.

Fig. 5a and 5b show two technical variants of the compression device 20. In both variants, two suction slots 32, 32' are shown, which correspond to the delivery top rollers 6 of the drafting device 2. In fig. 5a, two suction tubes 17, 17' are provided in the suction tube holder 23. Each of the suction pipes 17, 17' is connected to a suction pipe 24, 24', so that a negative pressure can be applied to the respective suction slot 32, 32 '. Each of the suction pipes 17, 17' may communicate with its own suction pipe 30, or the suction pipes may be connected to one common suction pipe 30. Two support disks 25, 25' connected by a support element 40 are arranged on the suction tube holder 23. A spring receptacle 42 is arranged in the support element 40 in an elongated manner. The elongate shape of the spring receiving section 42 ensures that the pressure spring 21, which is arranged stationary on the machine frame 28 or on the drafting device 2, moves the suction tube holder 23 axially along the lower output roller 7. The longitudinal orientation of the spring receptacles 42 is correspondingly parallel to the axis of the output lower roller 7.

Fig. 5b shows a second technical variant of the suction tube holder 23. In this variant, a single suction pipe 17 with two suction slots 32, 32' is arranged in the suction pipe holder 23. The two suction slots 32, 32' are suctioned together via a suction pipe 24. Thus, unlike the embodiment shown in fig. 5a, the two negative pressures on the suction slits 32, 32' cannot be easily set independently. But the structure of the device is simplified.

Fig. 6 is a side view of another compression device 20. In this compression device 20, the support disk 25 is not clamped from the top to the bottom on the delivery roller 7 as in the previous embodiment, but the support disk 25 is distributed from the bottom to the top on the delivery roller 7. The spring 21 presses the support disk 25 from below and up against the output roller 7 via the support element 40. In the case of an assignment of the suction tube 17 to the support disk 25, the following must be taken into account: the support disk 25 is spaced apart from the delivery roll 7 to such an extent that a clamping point K2 is provided for the fibre assembly 8 in each case, or the support element is arranged on the support disk in such a way that a rotational movement about the rotational point DS is carried out by the pressure of the spring 21, so that the suction tube 17 is pressed against the upper roller 6. The advantage of this arrangement of the support disk 25 from below to above on the output roller 7 is that the support disk 25 is easily prevented from unintentionally separating by the spring 21 pressure applied to the support disk 25 via the support element 40.

Fig. 7a is a partial view of the compression device of fig. 3. The traversing tongue is traversed as indicated by the arrow C and slowly moves the suction tube 17 arranged thereon and the tensioning device 22 for the screening element 18 arranged on the suction tube 17 back and forth. The screening element 18 extends around the suction pipe 17 and around the deflection rod 49 of the tensioning device 22. In order to prevent the screen elements 18 from wearing out relatively quickly in the event of a lateral displacement, a limiting fork 47 is provided, which is fastened to a stationary component of the spinning machine, for example a machine frame 48. During the transverse displacement of the suction pipe 17 and the deflection rod 49, the screening element 18 is blocked by the retaining fork 47 which loops around the screening element 18. The screening element 18 thus remains substantially in the same position at the deflection point of the screening element 18, i.e. the suction pipe 17 and the deflection rod 49 are axially offset. The fibers of the fiber aggregate 8 are oriented according to the current position of the feed hopper 45 (fig. 3) and the suction slit 32. Thus, the position at which the fibres contact the screening element 18 varies continuously, and the screening element 18 will always be exposed to slight wear caused by this contact at different positions. This protects the screening element 18 as a whole, in contrast to a constant force in the same position. Thereby extending the replacement cycle of the screen element 18.

Fig. 7b is a top view of the limiter fork 47 of fig. 7 a. As shown, the screen element 18 is blocked by a stationary limiting fork 47 against a deflecting bar 49 which is moved transversely in the direction of the double arrow C.

The device is constructed according to the preceding description, wherein the mentioned features can be applied individually or in any combination.

The invention is not limited to the embodiments shown and described. Variations may be employed which are within the scope of the claims, and features may be combined, even if the features are disclosed and described in different embodiments.

List of reference numerals

1 fiber aggregate

2 draft device

3 input roller pair

4 belt roller pair

5 output roller pair

6 output top roller

7 output roller

8 drafted fiber aggregate

9 wire guide

10 spinning device

11 rotor

12 ring

13 reel

14 Ring rail

15 spindle rail

16 fiber bundling zone

17 suction tube

18 screening element

19 load arm

20 compression device

21 spring

22 tensioning device

23 suction tube holder

24 draft tube (first part)

25 support disc

26 load assembly

27 loaded spring

28 frame

29 axis

30 draft tube (second part)

31 clamping piece

32 suction slit

33 connecting hose

40 support element

41 mating support

42 spring receiving portion

43 sideslip rod

44 transverse tongue

45 feed hopper

46 inclined plane

47 restriction fork

48 rack

49 deflection rod

C transverse movement

D load arm rotation point

Movement of P-load arm

K tilting motion

DS suction tube rotation point

K1, K2 pinch point