EP2828423B1 - Carrier element for a compaction device - Google Patents

Description

Technical area

The invention relates to a support element for a compression device for two juxtaposed drafting units of a spinning machine according to the preamble of claim 1.

State of the art

From practice, a variety of designs are already known, for compacting (compacting) of the votes of a drafting unit fiber material (fiber strand) downstream of a compacting device. Subsequent to such a compacting device, the compacted fiber material, after passing through a nip, a swirl-generating device is supplied. Such a swirl generating device consists for. Example, in a ring spinning machine from a rotor which rotates on a ring, wherein the yarn produced is wound on a rotating sleeve. As compression means are substantially evacuated circumferential, perforated suction drums or circumferential, provided with perforations straps used. In this case, a special suction region is defined on the compression element using corresponding inserts within the suction drum, or within the circumferential straps. Such inserts can be z. B. are provided with correspondingly shaped suction slots, to which a negative pressure is applied, whereby a corresponding air flow is generated at the periphery of the respective compression element. By this air flow, which is aligned substantially transversely to the transport direction of the fiber material, in particular projecting fibers are involved in the yarn.

In the known solutions, the fiber material discharged by the drafting unit is guided above or else below the compacting devices used. In particular, when used on a ring spinning machine, it is necessary to provide an additional nip following the suction zone in order to obtain a twist lock.

Such devices are z. B. in the publications EP 947 614 B1 . DE 10 2005 010 903 A1 . DE 198 46 268 C2 . EP 1 612 309 B1 . DE 100 18 480 A1 and the CN 1712588 A shown and described. The publications mentioned above are essentially permanently installed compression devices, which are permanently installed following the respective drafting system. The drive of these compaction devices takes place partly via special, arranged over the length of the spinning machine drive shafts, which are either in drive connection with a suction roll or a rotating belt or permanently installed drive connection to correspondingly arranged pressure rollers of the compression device.

In practice, there is the requirement existing spinning machines with a conventional drafting unit with such a compacting device after, in order to secure even with these machines the possibility of producing high quality yarns. Therefore devices have been proposed with which conventional drafting systems can be retrofitted with such a compacting device. Such is z. B. from the DE 102 27 463 C1 can be seen, wherein the punch of the drafting unit is extended to support an additional drive roller, which is provided for driving the retrofitted compacting device, which is also arranged on this extension. The drive roller extends over the entire length of the spinning machine. The installation and installation of such a retrofit is very time consuming and inflexible. D. h., In a desired dismantling to a normal drafting without compression device again a very high amount of time is necessary.

Out DE10210054850A1 is a compressor device for arrangement in a drafting system downstream compressor zone known. It has at least one wear-trained system part, which is supported in its working position against a rotating roller of the drafting system, and at least one holding part, with which the system part held in its working position and / or axially and radially fixed with respect to the roller, wherein the system part and the holding part are at least positively and reversibly releasably connected to each other firmly.

From the CN 101613896 A an embodiment is known, wherein an additional element is screwed to the punch to extend the punch of the drafting system. Furthermore, in the published DE 100 50 089 C2 an embodiment shown with a compacting device, which is intended for retrofitting to a conventional drafting device.

From the CN 2 851 298 Y a device is known, wherein a compaction roller are received with a rotation locking roller in a bearing element, which is connected via a plate via screws with a pivotable loading arm of a drafting device. In the mounted and locked position, the drive is transmitted via friction from a directly connected to a drive output roller and its associated pressure roller on the compression roller and the rotation locking roller. The compacting device shown here is also intended for retrofitting to existing drafting equipment of spinning machines without compression. The attachment of the compression unit shown here to an existing drafting unit via a screw, as well as the threading at the axis of the pressure roller is relatively time consuming and requires an additional Einjustierung the distances. Similarly, the connection to a vacuum source must be made separately.

In the embodiments described above, the suction elements, which are associated with a defined compression area for compressing the fiber material, are acted upon by additionally arranged lines, which are connected to a vacuum source, with a negative pressure.

To simplify such compaction devices, allowing for easy and quick installation to conventional drafting units without the need to install additional drive elements, the WO2012068693 proposed an embodiment, wherein the compression element in the form of a suction drum and the pinch roller on a common support (support member) are rotatably mounted, which is fastened via fastening means on the spinning machine removable. To a drive connection between the drafting rollers and To produce the compacting device mounted dismountable, the compacting device is pivoted about the support member about a pivot axis in the direction of the output roller pair of the drafting system, in each case a coaxially mounted on the respective suction drum friction wheel with the lower roller of the output roller pair of the drafting system takes a frictional connection (via friction). By means of appropriately arranged spring elements (eg on the loading arm of the drafting system), the compacting device is held in this drive connection.

The support member is provided in the present example for the rotatable mounting of two coaxial and juxtaposed suction drums, which are attached to two adjacent drafting units, a so-called twin drafting. Under a twin drafting two adjacent drafting units are to be understood, the pressure rollers are loaded via a common pressure arm.

Within the support element (carrier), a suction channel for applying a negative pressure to the compression elements is provided. In this case, a first end of the suction channel communicates with the respective compression element and its second end terminates in the region of the support element with which the support element is fastened in its mounted position on the spinning machine. The second end of the suction channel within the support element forms a coupling point for the connection of a further air channel, which is in communication with a main channel.

Ie. in the proposed embodiment, the support element (support) serves on the one hand as a receptacle and bearing element for the compression elements (eg rotatably mounted suction drums with permanently installed suction inserts) and on the other hand as a channel for applying a negative air pressure to the corresponding suction inserts of the compression units.

Presentation of the invention

The invention is now based on the object, in the WO2012068693 shown and described support member with compression devices for two side by side arranged to simplify and improve arranged drafting units to ensure a simplified and cost-effective production. Likewise, the assembly of the attached to the support member shaft for the rotatable mounting of the suction drums should be simplified.

This object is achieved in a support element according to the preamble of the independent claim by the characterizing features.

The term "outwardly projecting suction insert" means that the suction insert of the respective half-shell extends transversely to the longitudinal direction and away from the suction channel of the half-shell, or of the conveying channel.

Furthermore, it is proposed that the shaft is provided with two end portions, which have a smaller diameter relative to a central region of the shaft and the passage opening of the bearing element of the respective suction insert is provided with a stepped reduction in their inside diameter, wherein the, with the larger clear width provided portions of the passage openings adjoin one another coaxially and the, provided with a larger diameter than the reduced inside diameter of the passage opening central portion of the shaft within said, adjacent sections between abutment surfaces of the respective stepped reduction of the passage openings in the axial direction is fixed.

By proposing to form the support element of two half-shells which can be connected to one another, its manufacture is simplified, whereby it is made possible for the half-shells to be produced as simple injection-molded parts. At the same time, the, connected to the respective half-shell, tubular suction insert can be made in the same operation. In the assembled state of the two half-shells attached to the half-shells suction inserts are aligned coaxially with each other. By the appropriate attachment of a passage opening in the center of a, the shaft in the radial direction superimposed recording of the respective suction insert, the shaft which is provided for rotatably supporting the suction drums, at the same time fixed in the axial direction when joining the two half-shells. In order to The respective half shell of the support element and its associated suction insert form a one-piece, stable unit.

By appropriately proposed, towards their ends, stepped in diameter design of the shaft, this can protrude with their ends through the openings of the bearing element of the suction inserts and is about their, enlarged in diameter middle part when joining the two half-shells between the opposite Fixed sides of the stepped diameter reduction of the passage openings in its axial direction. This is ensured by the diameter of the reduced passage openings is smaller than the diameter of the central part of the shaft. It is also conceivable that the bearing elements are provided for radially fixing the shaft in the region of the stepped diameter reduction with coaxial with the respective passage opening recesses, the base of the respective recess serves as a stop surface for the axial fixation of the central part of the shaft and in the circumferential direction of the Deepening the middle part of the shaft fixed in the radial direction. That is, the diameter of the central portion of the shaft corresponds to the clear width of the recess and is held in this via a clearance in the radial direction.

The proposed design of the support element enables a simple manufacturing process and at the same time simplifies the assembly of the elements connected to the support element (eg the shaft for the suction drums).

Furthermore, it is proposed that the two half-shells are each provided with an opening for receiving a respective suction tube, which are associated with the respective suction drum, wherein the center axes of the openings in the mounted state of the support element are aligned coaxially with each other and their coaxial common axis in one parallel distance to the axis of the suction drums superimposed shaft. The openings open in each case in the edge region of the suction channel.

Due to the proposed attachment of the coaxial openings for the suction tubes in the edge region of the suction channel, the air flow through which The applied to the suction inserts negative pressure, not negatively disturbed, or influenced. The, caused by the applied negative pressure on the suction tubes in the direction of the channel center air currents collide in the central region of the suction channel to each other and are then redirected in the direction of the suction air flow within the suction channel. This means that there are no fixed deflecting edges for the air flow sucked in via the suction pipes, as a result of which no friction losses in the air duct can arise in this area.

Advantageously, it is further proposed that in the region of the openings for the suction pipes, the respective half-shell is provided with projecting to the center of the suction channel webs which extend axially and in extension to the respective opening on the side of the opening which faces the suction drums.

Thus, the air flow flowing from the suction tubes into the suction channel is mostly sealed off from the suction air flow coming from the suction inserts. Ie. a combination of the two Saugluftströmungen takes place only in the area in which coming from the suction first suction air stream has already passed to the middle of the suction channel webs and in which coming from the suction second suction air stream has already been redirected in the direction of the first suction air stream. This avoids uncontrolled air turbulence within the suction channel and thus also the accumulation of dirt and fiber material in this area.

So that when joining the two half shells between the adjacent webs no place arises at which individual fibers can clamp, it is proposed to provide a distance between the adjacent surfaces of the webs, which must be so large, so that a clamping of fibers to this Job is prevented. That is, when fibers are transferred to the area by the suction air flow, they can pass through the existing slot without jamming.

Advantageously, the suction pipes are removably attached to the respective opening. This makes it possible different suction tubes as needed against each other exchange. At the same time, the production of the two half-shells of the support element can take place without consideration of complicated injection molds, which are necessary if the suction tubes were firmly connected to the half-shells. Thereby, as further claimed, and without affecting the production of the two half-shells, the central axis of the respective suction pipe at an angle to the axis of the suction drum supporting shaft. This increases, starting from the outer suction opening of the suction tube in the direction of the opening of the half-shell, the distance between the respective suction tube and, the suction tube opposite suction drum. Thus, the space between the respective suction pipes and the respective suction drum can be kept so large, so that no deposits can form in this area by fiber fly.

In order to align the suction tubes with respect to an oblique arrangement exactly on the intended suction of the respective suction drum, it is proposed that the suction tubes are provided with elevations and / or depressions via which they form a positive connection in the circumferential direction with elevations and / or depressions in the region of the opening of the half-shell form.

Furthermore, it is proposed that the outer suction openings of the suction tubes lie in planes which, viewed in the horizontal direction and in the suction direction of the fiber channel, form an acute angle and move toward one another above the suction channel in the vertical direction.

With this proposed, in the space obliquely oriented suction openings an optimal suction effect is achieved with respect to the thread path, whereby a broken thread end can be quickly detected and fed to the suction channel. Preferably, the suction opening could also be partially behind the yarn course (as seen in front view of the compacting device).

Furthermore, it is proposed that the bearing elements of the two suction inserts of the half shells each have an additional radial support for the shaft, which is provided adjacent in the region in which the half shells lie in the mounted position to each other.

The additional central radial support of the shaft via additional support elements in the bearing element, a separation of the two half shells is prevented, which could arise as a result of acting on the suction drums radial compressive forces.

In order to prevent rotation of the shaft in the bearing element, it is further proposed that at least one of the radial supports forms a positive connection in the half shells with the shaft, seen in the circumferential direction of the shaft. This ensures that only the suction drums mounted on the shaft via bearings rotate and the shaft stops and thus no wear occurs between the shaft and its radial supports in the bearing element.

So that the suction air flow generated by a suction source in the region of the bearing of the suction drums does not flow through the provided with grease bearing, it is proposed that the shaft is provided in the region of the bearing points for the respective suction drum for the passage of air with a longitudinally aligned flattening. This allows the suction air flow in the area of the flattening of the shaft to be routed past the grease-lubricated bearings. Without such a bypass created by the proposed flattening, it may happen that the grease is forced out of the bearings by the suction air flow, which may settle on parts of the shaft or half shells. As a result, located in the suction air flow fibers can be held in the areas where the fat adheres, which can lead to blockages.

For easy visual monitoring of the support element with the attached suction inserts is proposed that the half shells are made of a transparent plastic material.

Furthermore, an embodiment is proposed, wherein the respective suction insert of the half-shells is provided with a, running on the outer circumference of the suction insert recess which in the region between the end face of the respective half-shell, with which they lie against each other and the respective, the suction insert superior face of the suction drum is arranged.

This is to prevent that may possibly get stuck in the middle region of the support element festsetzender fiber fly and other contaminants in the radial annular gap between the respective suction drum and the suction insert. Ie. through the intended depression, the fiber fly settles in this depression and is prevented by the lateral boundary of the depression from moving in the axial direction to the respective suction drum in the described annular gap. By regularly performed cleaning cycles, in which the units are cleaned by appropriate devices manually or automatically with compressed air, these deposits are removed before they can reach the respective annular gap.

Advantageously, in the area of the surfaces with which the two half-shells abut each other during assembly (assembly), lamellar gradations (spring / groove principle) may be provided in order to seal off the suction channel formed by the two half-shells from the ambient air. If necessary, even circumferential sealing elements can be used.

Instead of a screw connection between the two half-shells, these can also be connected to one another via an adhesive or welding connection. There are also snap connections with labyrinth-like sealing elements conceivable that seal the suction against the environment.

When joining the two half-shells and the respective suction inserts are pressed against each other, whereby an interior forms within the suction inserts, which is on the one hand with the suction channel and on the other hand with the respective suction slot in connection. To limit this interior space (air-conducting channel) extending in the longitudinal direction of the respective suction insert and radially outwardly directed webs may be provided. These are advantageously arranged so that the interior, which leads as an air duct from the suction slots to the suction channel, seen from the front view, behind the shaft.

As a result, the sucked through the suction slots air is fed directly to the suction channel without further deflection, so that the air can be sucked without disturbing air vortex.

Furthermore, an embodiment for the connection of the two half shells is proposed, wherein the two half shells are each provided with a circumferential flange, wherein - viewed in the mounted position of the two half shells - the flange of the second half shell partially surmounted the first half shell and the flange of the first Half shell completely surmounted the flange of the second half-shell and forms a positive clamping connection with this. This provides a connection without the use of additional connecting means (eg screws, rivets, etc.) while at the same time sealing the interior from the environment.

Advantageously, it is further proposed that the flange of the second half-shell is provided with an inwardly directed receptacle in which positively engages the outer contour of the flange of the first half-shell and the flange of the second half-shell in the region of the free transfer of the flange of the first half-shell an inwardly directed web is provided, which projects beyond the flange of the first half-shell partially.

Furthermore, it is proposed that in the mounted position of the two half-shells between the end faces of the flanges of the half-shells, a gap is provided in the direction of the interior of the two half shells, which is sealed off to the outside by the flange of the first half-shell.

Further advantages of the invention will be shown and described in more detail with reference to subsequent embodiments.

Brief description of the figures

Fig. 1

eine schematische Seitenansicht einer, an einem Tragelement angebrachten Verdichtungsvorrichtung im Anschluss an ein Streckwerk.

Fig. 2

eine vergrösserte Seitenansicht einer erfindungsgemäss ausgebildeten Halbschale des Tragelementes nach Fig.1

Fig. 3

eine Draufsicht nach Fig.2 mit beiden Halbschalen des Tragelementes und den am Tragelement gelagerten Saugtrommeln vor dem Zusammenfügen.

Fig. 4

eine vergrösserte Teilansicht N nach Fig.1

Fig. 4a

eine Schnittdarstellung x-x der Welle 22 nach Fig. 4

Fig. 5

eine Teilansicht einer Schnittdarstellung in der Ebene E nach Fig. 2

Fig. 6

eine Teilansicht der Absaugrohre nach Fig. 3 in montiertem Zustand

Fig. 7

eine vergrösserte Teilansicht nach Fig. 5

Show it:

Fig. 1

a schematic side view of a mounted on a support member compression device following a drafting system.

Fig. 2

an enlarged side view of an inventive trained half shell of the support element according to Fig.1

Fig. 3

a top view Fig.2 with both half-shells of the support element and the suction drums mounted on the support element prior to assembly.

Fig. 4

an enlarged partial view N after Fig.1

Fig. 4a

a sectional view xx of the shaft 22 after Fig. 4

Fig. 5

a partial view of a sectional view in the plane E after Fig. 2

Fig. 6

a partial view of the suction after Fig. 3 in assembled condition

Fig. 7

an enlarged partial view Fig. 5

Presentation of the invention

FIG. 1 shows a schematic side view of a spinning station 1 a spinning machine (ring spinning machine) with a drafting unit 2, which is provided with an input roller pair 3, 4, a middle roller pair 5, 6 and a pair of output rollers 7, 8. To the center rollers 5, 6 is in each case a strap 12, 13 out, which are each held around a cage, not shown in detail in its illustrated position. The upper rollers 4, 6, 8 of said pairs of rollers are designed as pressure rollers, which are rotatably mounted on the axes 4a, 6a, 8a on a pivotally mounted pressure arm 10. The pressure arm 10 is pivotally mounted about an axis 15 and, as shown schematically, acted upon by a spring element F. This spring element can, for. B. also be an air hose. About the spring load shown schematically, the rollers 4, 6, 8 pressed against the lower rollers 3, 5 and 7 of the roller pairs. The roller pairs 3, 5, 7 are driven by a drive, not shown. In this case, individual drives, as well as other forms of drive (gears, timing belts, etc.) can be used. About the driven lower rollers 3, 5, 7, the pressure rollers 4, 6, 8, and the belt 13 are driven via the belt 12 via friction. The peripheral speed of the driven roller 5 is slightly higher than the peripheral speed of the driven roller 3, so that the, the drafting unit 2 supplied fiber material in the form of a sliver L between the input roller pair 3, 4 and the middle roller pair 5, 6 subjected to a default becomes. The main distortion of the fiber material L takes place between the middle roller pair 5, 6 and the pair of output rollers 7, 8, wherein the output roller 7 has a substantially higher peripheral speed than the center roller 5.

Like from the FIG. 4 (View N after FIG. 1 ), a pressure arm 10 is assigned to two adjacent drafting unit units 2 (twin drafting system). Since it is the same or partially mirror-image arranged elements of the adjacent drafting units, or compression devices, the same reference numerals are used for these parts.

The drawn from the respective output roller pair 7, 8 stretched fiber material V is deflected downward and enters the region of a suction zone Z of a subsequent suction drum 17. The respective suction drum 17 is provided with extending on its circumference perforations or openings Ö. Within the, about a bearing K on a shaft 22 rotatably mounted suction drum 17, an annular suction insert 18 is arranged in each case. As schematic Fig.2 and from Fig. 3 can be seen and will be described below, the respective suction insert 18 is an integral part of each of a half-shell H1 and H2, wherein the two half-shells form a support member 20 in the mounted state. The first half-shell H1 consists of a pivot profile 55 which is open on one side and a suction insert 18 fixedly connected to it. The second half-shell H2 has a pivoting profile 56 which opens into a suction insert 18 connected to it. The suction inserts 18 are aligned transversely to the longitudinal direction of the respective half-shell H1, H2. The profiling of the respective half shell H1, or H2 is formed so that they can be made completely in each case in an injection mold. This makes it possible to form the air-conducting areas optimally and without sharp-edged transitions, whereby deposits of contaminants within the air-conducting areas are almost impossible.

In Fig. 3 the assembly (mounting) in the direction of the arrow of the two half-shells H1, H2 is shown to a support member 20. By joining the pivot profiles 55, 56 of the two half-shells H1, H2, which are open on one side, an all-round closed suction channel SK is formed ( Fig. 1 . Fig. 4 ). Here are the faces SF of two half-shells H1, H2 lie on each other and are pressed against each other over several distributed over the length of the two half-shells screw 48. In the area of the screw connections, the half shells are each provided with a web 49, which each have a through hole for the screws 48. The end faces SF may be provided with ridges and depressions (not shown), which together form a labyrinth-shaped sealing point. Likewise, additional sealing elements (not shown) for sealing the formed suction channel SK can be provided between the end faces SF. Furthermore, it is possible to connect the two half-shells H1, H2 via adhesive or welded connections. Instead of the screw 48 and other mechanical fasteners, z. As rivets or the like can be used. There may also be a snap connection in the region of the end faces. For this purpose, the half shells H1, H2 must be provided in this area with correspondingly shaped end faces. This will be further described in an embodiment, which in Figure 7 is shown.

When joining the two half-shells H1, H2 and the respective suction inserts 18 are pressed against each other, whereby an inner space 66 is formed, which is on the one hand to the suction channel SK and the other with the respective suction slot S in combination. For limiting the air-conducting channel 66 extending and radially outwardly directed webs S1, S2 are provided in the longitudinal direction of the respective suction insert 18, which are each connected to a provided in the center of the respective suction insert 18 tubular hub G with a central opening B. This is schematic in the FIGS. 2, 3 and 4 shown. The hub G extends in the half-shell H1 between the end face SF and a radially oriented web 57 which is mounted within and in the region of the free end of the suction insert 18. The web 57 is provided with a central passage opening U. In the half-shell H2, the hub G extends between the end face SF and a radially oriented web 58 which is mounted within and in the region of the free end of the suction insert 18. The web 58 is also provided with a central passage opening U. In the area of the opening B and the passage openings U, the shaft 22 is mounted, which has a central part 22 m, on which on both Ends each includes an end piece 22a, which have a smaller diameter than the central part 22m.

The inside width Lw of the opening B of the respective hub G is greater outside the existing radial bearing points than the outside diameter of the respective section 22m, 22a of the shaft 22. In this case, the respective hub G has a longitudinal section A1 of the opening O, at which a longitudinal section A2 adjacent whose clear width Lw is smaller than the inside width Lw of the section A1 and the diameter of the portion 22m of the shaft 22. In the assembled state of the half-shells H1, H2, the two sections A1 of the respective suction inserts 18 directly adjoin one another. In the region of the transitions between the sections A1 and A2 of the opening O, a stepped recess C (shoulder) is provided in each case in which the middle section 22 m of the shaft 22 is fixed in the radial direction. That is, the inside width Lw of the recess C corresponds to the diameter of the middle part 22m of the shaft 22.

The inner space 66, which leads as an air guide channel from the suction slots S to the suction channel SK, extends from the view N (FIG. Fig.1 ) seen from behind the shaft 22, and the hub G. As a result, the air sucked through the suction slots is fed directly and without further deflection to the suction channel SK, whereby the air is sucked out without disturbing swirling air. For stiffening the suction insert 18, a further web S3 may be provided ( Fig. 2 ).

In Fig. 2 one of the half shells H1 is shown in a side view. Separately shown is a suction tube 75, which is fastened in the region of the opening 77 on the half-shell H1. As from the representation of Fig. 3 can be seen, the central axis MS of the suction tube 75 extends from its attachment point in the assembled state obliquely and at an angle c to a vertical plane E, which is parallel to a, through the central axis MA of the suction drum 17 vertical plane. The suction tube 75 ', which is attached to the second half-shell H2, is mirror-inverted and also extends, seen in a horizontal plane, at an angle c to the central axis MA. Due to the intended oblique arrangement of the respective suction tube of the remaining free space between the respective suction tube 75, 75 'and the adjacent suction drum 17 is so large, so that in this Free space can accumulate no dirt. However, it is ensured that the suction effect is optimal, since the openings of the suction tubes are as close to the thread path. As seen from the view of 4 and FIG. 5 can be seen, the suction tubes 75, 75 'also seen in the horizontal direction, in addition to extend at an angle k to the central axis of the suction drums 17. As schematically in Fig. 4 and in Fig. 3 shown, the suction tube 75 (as well as the suction tube 75 ') on a flange 70 which is provided with a cam 78. About this cam 78, the respective suction tube 75, 75 'is fixed in its installed position in its circumferential direction. In this case, the respective cam 78 protrudes into a recess 79 of the respective half-shell H1, H2, which are mounted in the region of the openings 77. Due to the separate mounting of the suction tubes, it is on the one hand possible, depending on the requirements, to replace them with others. On the other hand, when creating the injection mold for the production of the half-shells H1, H2, no consideration must be given to the oblique orientation of the suction pipes, whereby the injection mold can be made simple and inexpensive.

Like from the Fig. 2 and the Fig. 3 can be seen, the respective opening 77 is sealed off by a transversely extending to the suction channel web 60 relative to the suction of the suction inserts 18 indicated by a suction air stream. This prevents a collision of the two suction air streams (from the suction inserts 18 and the suction tubes 75, 75 ') in the region of the openings 77, which could lead to air turbulences. As soon as uncontrolled air flows occur within a suction channel, there is the danger that soiling may settle in this area, which may ultimately lead to a closure of the suction channel. However, this was prevented by the proposed attachment of the webs 60. Each of the webs 60 has ( Fig. 3 ) a distance r1 to the respective end face SF, whereby a distance r between the webs 60 forms when the two half-shells are connected to each other. This is z. B. in the partial view in Fig. 6 shown schematically. If no distance r were provided, the joining of the two half shells H1, H2 between the two webs 60 could form a sharp edge or a narrow slit on which fibers can adhere or be clamped. To exclude this, from the outset, a gap with a distance r, which is so large that fibers entering this area can pass through the gap.

As shown schematically in the Figure 3 and Figure 4 indicated, the respective suction insert 18 on a portion of its circumference on a suction slot S, which extends substantially over the suction zone Z. In addition, the respective suction insert 18 is provided in the region of the slot S with a circumferential recess 61 to the, z. B. on the suction air flow through the openings Ö in the interior of the respective suction drum 17 reached impurities and fibers to keep in the suction slot S, via which they can then be sucked and fed to a central collection point. This is to prevent deposits of dust and fibers within the suction drum.

The respective suction drum 17 is rotatably mounted in the region of its outer end via a bearing K on an end piece 22a of the shaft 22. The opposing end pieces 22a of the shaft 22 have a smaller diameter than the central part 22m of the shaft 22, so that between the middle part 22m and the adjoining end pieces 22a, a shoulder is formed with a stop surface AF. For axial fixing of the suction drum 17 on the shaft 22, a locking ring 23 is mounted in a groove of the shaft, which prevents the axial displacement of the suction drum during operation. In the center of the respective suction drum 17, an opening 21 is attached, which is closed by a cap 30. By removing the retaining ring 23, after removing the cap 30, it is possible to easily withdraw the respective suction drum 17 from the end piece 22a of the shaft 22 in the axial direction. As a result, a quick replacement of the suction drums 17 is possible, if necessary to exchange them with other suction drums with a different arrangement of the openings Ö to convert the compression element to the processing of another fiber material. The removal of the respective suction drum can also be done only for cleaning purposes. The retaining ring can also z. B. be an O-ring made of rubber or a flexible clamping ring.

The shaft 22 is in the assembly of the two half-shells H1, H2, or provided on the half-shells suction inserts 18 according to Figure 3 in axial and in radial Location fixed. In this case, the shaft 22 is fixed via its middle part 22m, which has a length Lm, between the abutment surfaces T1 and T2 of the recesses C. In assembled condition ( Figure 4 ) of the two suction inserts 18, the stop surfaces T1, T2 of the recesses C a distance Lx to each other, which is only slightly greater than the length Lm of the central part 22m of the shaft 22. Thus, the shaft is fixed in the axial direction within the suction inserts 18, wherein in each case the end pieces 22a of the shaft 22 protrude through the openings U of the webs 57, 58, on which the suction drums 17 are pushed over their bearing K. As already described, for the radial mounting of the shaft 22 are in the region of the abutment surfaces T1, T2 of the recesses C, whose clear width corresponds to the diameter of the central shaft portion 22m. Thus, the shaft portion 22m rests with its outer peripheral surface on the inner peripheral surface of the recess C and is thus fixed in the radial direction.

Fig. 4a shows a sectional view xx of the shaft 22 after Fig. 4 , The shaft 22 is provided in the region of the bearings K for the respective suction drum 17 for the passage of air with a longitudinally aligned flattening 82.

In the region of the separation point of the two half-shells H1, H2, the two suction inserts 18 can be provided with additional supports 52, 53 projecting into the respective opening B, on which the middle part 22m of the shaft 22 can be supported in a specific radial direction. These supports are mounted only on a partial peripheral area of the opening and aligned according to the force effects occurring. The supports 52, 53 can also be formed by a corresponding shape of the cross-section of the opening B in this area.

This ensures that the radial forces acting on the suction drums 17, which are transmitted to the shaft 22 via the bearings K, are absorbed by the supports 52, 53, or the respective hub G. This prevents that it can come by the resulting bending moment to a spread apart of the two suction inserts 18 in the region of the separation point of the two half-shells.

After assembly of the two half shells H1, H2 with simultaneous fixation of the shaft 22, they are screwed together via the screw 48 against each other. Subsequently, the suction drums are pushed over the bearing K on the shaft ends 22a and secured axially via a respective securing ring 23 which engages in a schematically indicated groove of the respective shaft end. The access to the shaft end via a central opening 21 of the respective suction drum 17. After the suction drum has been secured, the openings 21 are closed by a schematically illustrated elastic cap 30.

Subsequently, the two suction tubes 75, 75 'are fixed in the region of the openings 77. The suction tubes 75, 75 'have at their one end a flange 70, which is provided in the region of its peripheral surface with a radially outwardly facing cam 78. The outer diameter of the respective flange 70 corresponds approximately to the inner diameter of the attached to the respective half-shell H1, H2 centric to the opening 77 flange 71. In the region of the inner peripheral surface of the flange 71, a radially outwardly projecting recess 79 is attached, the outer contour of the contour of the Cam 78 corresponds. Thus, the cam 78 and the recess 79 form a positive connection, when the flange 70 of the respective suction tube 75, or 75 'is inserted into the opening of the flange 71, wherein the cam 78 and the recess 79 face each other. Thus, the respective suction tube is fixed in the circumferential direction and takes the desired angular position with the angle c to the respective suction drum 17 a. By a correspondingly selected massive design of the flanges 70, 71, the suction tubes 75, 75 'are held in their installed position via a slight press fit. However, other fasteners can be used to hold the mounted suction tubes in their installed position.

Subsequent to the suction zone Z, a clamping roller 33 is provided for each of the suction drums 17, which rests on the respective suction drum 17 via a pressure load and forms with it a clamping line P. In this case, the respective pinch roller 33 is rotatably mounted on an axis 32, which is held in a guide slot 73 of a U-shaped receptacle of a pressure arm 72. The axis 32 is slidably mounted within the guide slot 73 transversely to its longitudinal axis. In the guide slot protrudes through an opening of the pressure arm, a plunger, which rests on the outer circumference of the axis 32 and is acted upon by a pressure spring F2 shown schematically. The opening is approximately centrally mounted at the end of the guide slot 73 and opens into a substantially closed cavity of the pressure arm 72, in which the compression spring is arranged. This supports one end at the closed end of the cavity and rests with the opposite end on a head of the plunger.

The pressure arm 72 is pivotally mounted about a, attached to its end axes 24 in a bearing member 80, as seen from Fig.1 can be seen schematically. The bearing element 80 is formed on the half-shells H1, H2 mounted webs T, and T ', which are each provided with a guide 81, via which the axes 24 of the pressure arm 72 in their, in Fig.1 shown pivot position are transferred when the two half-shells H1, H2 are interconnected. In this pivotal position, the axes 24 via a schematically in Fig.1 shown stop edge held transversely to its pivot axis at the end of the respective guide 81. About the force of the compression spring F2 then rotatably mounted on the pressure arm 72 pinch rollers 33 are loaded against the respective suction drum 17, wherein a nip line P is formed. The pressure arm is pivoted over dead center until it rests on a stop 65 which is attached to the respective half-shells H1, H2. In this position, the axis 32 of the pinch rollers 33 is below the plane passing through the pivot axis 24 and the center axis MA of the suction drums 17. That is, the pinch roller 33 is held over dead center in this position. Further details with respect to the attachment and execution of the pinch rollers 33 can also be found in the CH705308 be removed.

The compacting device VM is now pre-assembled and is now attached to the respective drafting system 2 (twin drafting) on the spinning machine. In this case, the support member 20 is inserted with the attached to the pivot profiles 55, 56 of the half shells H1, H2 axes 32 in receptacles 34 on the machine frame MR and not shown clamping elements or other means in this in Fig.1 shown pivot position held. As shown in dotted lines, the compaction device Pivot VM via the pivot axes 32 in a lower position until it rests on a, attached to the machine frame MR stop 64 and held there. For transfer to the in Fig.1 shown working position, the compacting device VM is pivoted about the axes 32 in an upper position until the mounted on the respective suction drum 17 friction rings 28 (friction wheel) rest on the respective driven roller 7 of the pair of drafting rollers 2.

Subsequently, the pressure lever 10 about its pivot axis 15 of a dashed upper position ( Fig.1 ) is pivoted to a lower position, in which a pressure force is exerted on the support element 20 of the compacting device VM in the direction of the roller 7 via a leaf spring 68 fastened by means of screws to the pressure lever 10 and the web 62 secured to the leaf spring. As a result, the respective friction ring 28 and thus the associated suction drum 17 is driven by the roller 7 via friction. The friction ring 28 may be made of an elastic material, such. B. made of rubber.

In this "operating position" the distorted by the drafting 2 and discharged fiber material of the following suction zone Z of the respective suction drum 17 is supplied and compressed in a known manner under the influence of the generated suction air stream. Above the suction zone can still be mounted at a distance arranged Umlenkschirm such. B. in the DE-44 26 249 is shown and described. This publication also describes the course of the densification of the fiber material.

To generate the required negative pressure in the region of the suction zone Z, a vacuum source SP is provided which communicates with a central suction channel 85. The suction channel 85 is connected via a line 86, a flexible coupling element 88 with the respective, in the direction of the suction channel 85 projecting end of the suction channel SK of the compression device VM, in conjunction. Due to the flexibility of the coupling element 88, the pivotability of the compacting device about the axis 32 is made possible. The coupling element 88 shown schematically may be formed on its outer circumference, so that it is positively connected to the formed suction channel SK when joining the two half-shells H1, H2 and to the outside.

The nip line P generated by the pinch roller 33 simultaneously forms a so-called "rotation locking gap", from which the fiber material in the conveying direction FS in the form of a compressed yarn FK is supplied under rotation distribution of a ring spinning device shown schematically. This is provided with a ring 39 and a rotor 40, wherein the yarn is wound on a sleeve 41 to form a coil 42 (Kops). Between the nip line P and the rotor 40, a yarn guide 43 is arranged. The ring 39 is attached to a ring frame 44, which performs an up and down movement during the spinning process.

In a yarn break between the nip P and the spool 42, the yarn FK further supplied via the nip P is conveyed via the respective suction pipe 75 and 75 'via the opening 77 under the action of the exhaust pipe 75 mounted on the support member 20 via the negative pressure source SP Vacuum sucked through the suction channel SK and the suction channel 85 is supplied. In this case, the respective suction opening 38 of the suction tubes 75, or 75 'is assigned to the side of the yarn course.

In the region between the end faces SF, with which the two half shells H1, H2 lie on each other and the end faces 84 of the suction drums 17, a recess X is in each case mounted on the peripheral surface of the respective suction insert 18. This results in each case a step-shaped shoulder 90 in the region of the end faces 84 of the suction drums 17, which prevents 20 accumulated fiber fly in the center region of the support member 20 can move into the gap 87 between the suction drum 17 and the suction insert 18. Ie. the respective step-shaped step 90 provides a barrier to lateral displacement of deposits. Such deposits are then removed in time over cleaning intervals before they can overcome the described barrier.

Another embodiment with respect to the connection of the two half-shells H1, H2 is shown in FIG Figure 5 (View H) shown, which as an enlarged partial view in Figure 7 is shown in more detail. In this case, the two half shells H1, H2 at their ends encircling flanges 45, 46, via which the two half-shells with each other without additional additives (eg., Pins, screws or the like) positively connected become. At the same time, with the embodiment shown here, the interior of the suction channel SK and the inner area of the suction inserts 18 are sealed off from the environment without the need for additional sealing means in the region of the connection points.

In this case, the flange 45 of the first half-shell H2 is provided with an inwardly pointing shoulder 92, whose inner surface 93 engages over the outer surface 94 of the half-shell H1 partially and comes to rest thereon in the mounted position. Furthermore, a flange 46 is attached to the half-shell H1, which completely overlaps or covers the flange 45 on its outer surface AL. The flange 46 has an L-shaped cross-sectional area which forms an inwardly directed receptacle 50 over which the flange 46 forms a positive connection with the flange 45 in the illustrated assembled position. The term "inside" refers to the interior of the mounted half-shells H1, H2.

At the end of the L-shaped cross-section of the flange 46 is provided with an inwardly projecting web 89 which projects beyond the rear surface 91 of the flange 45 and holds the flange 45 in its shown locking position in the receptacle 50 of the flange 46. D. h., When the connection is to be released again, force is necessary to deflect the L-shaped portion of the flange 46 on the existing elasticity outwards until the web 89 is outside the surface 91 and thus the outlet of the flange 45 allows the recording 50. To facilitate assembly of the flange 46 is provided with a chamfer 95.

In order to avoid a sharp edge in the region of the connection point between the half-shells H1, H2, or between their flanges 45, 46, a gap 36 with the distance n between the surfaces 45a and 46a of the flanges 45, 46 is provided. This prevents fibers from being trapped in this area. The gap 36 is sealed off from the ambient air by the inner surface 93 of the flange 45 to the outside.

With the proposed embodiment, wherein the support member 20 of the compacting device VM made of two half-shells H1, H2 with integrated suction inserts 18 is on the one hand, a simple and cost-effective production allows and on the other hand ensures easy installation, with an optimal function is given in relation to a lossless air flow within the support element.

Claims (18)

1. A carrier element (20) for a compaction device (VM) having two suction drums (17), a suction insert (18) being situated within each suction drum (17);
   in each case a suction drum (17) being associatable with an output roller pair (7, 8) of a drawing unit (2) of a spinning machine;
   the suction drums (17) being rotatably supported, via a bearing (K), on a shaft (22) that is fastened to the carrier element (20);
   a suction channel (SK) extending within the carrier element (20);
   characterized in that the carrier element (20) is made up of two half-shells (H1, H2) which are connectable to one another via fastening means (48) and which in the connected state form the suction channel (SK), each of the half-shells (H1, H2) having a suction insert (18).
2. The carrier element (20) according to Claim 1, characterized in that the suction drum has (17) openings (Ö), and each suction insert (18) has a suction slot (Z).
3. The carrier element (20) according to Claim 1 or 2, characterized in that with their end-side faces that are open on one side, the suction drums (17) are situated coaxially opposite and spaced apart from one another.
4. The carrier element (20) according to one of Claims 1 to 3, characterized in that suction inserts (18) are situated coaxially opposite from one another, and each suction insert (18) has a hub (G) with a through opening (B) for accommodating the shaft (22), the hub (G) having a shoulder (C).
5. The carrier element (20) according to Claim 4, characterized in that the shaft (22) is provided with two end sections (22a) that have a smaller diameter than a middle area (22m) of the shaft, and the through opening (B) in the hub (G) of the respective suction insert (18) is provided with a stepped reduction of its inside width (Lw), the sections (A1) of the through openings (B) that are provided with the larger inside width (Lw) adjoining one another coaxially, and the middle section (22m) of the shaft (22), which is provided with a larger diameter than the reduced inside width (Lw) of the through opening, being fixed, within the aforementioned mutually adjoining sections (A1), in the axial direction between stop surfaces (T1, T2) of the respective stepped reduction of the through openings.
6. The carrier element (20) according to one of Claims 1 to 5, characterized in that each of the two half-shells (H1, H2) is provided with an opening (77) for accommodating a suction tube (75, 75'), each half-shell being associated with the respective suction drum (17), wherein the center axes of the openings (77) in the installed state of the carrier element (20) are oriented coaxially with respect to one another, their coaxial shared axis extends at a parallel distance from the axis (MA) of the shaft (22) supporting the suction drums (17), and in the edge area of the suction channel (SK) the openings (77) open into the suction channel.
7. The carrier element (20) according to Claim 6, characterized in that in the area of the openings (77), each half-shell (H1, H2) is provided with webs (60) which project toward the middle of the suction channel (SK), and which extend axially and in the extension toward the respective opening (77) on the side of the opening facing the suction drums (17).
8. The carrier element (20) according to Claim 7, characterized in that the two webs (60) are situated at a distance (r) from one another.
9. The carrier element (20) according to one of Claims 6 to 8, characterized in that the suction tubes (75, 75') are removably mounted on the respective opening (77).
10. The carrier element (20) according to one of Claims 6 to 9, characterized in that the center axis (MS) of the respective suction tube (75, 75') extends at an angle (c) with respect to the axis (MA) of the shaft (22) supporting the suction drums (17), as the result of which, starting from the outer suction opening (38) in the suction tube (75, 75') in the direction of the opening (77) in the half-shell (H1, H2), the distance between the particular suction tube (75, 75') and the suction drum (17) situated opposite from the suction tube increases.
11. The carrier element (20) according to one of Claims 6 to 10, characterized in that the suction tubes (75, 75') are provided with elevations and/or depressions (78) which form a positive fit in the circumferential direction with elevations and/or depressions (79) in the area of the opening (77) in the half-shell (H1, H2).
12. The carrier element (20) according to one of Claims 6 to 11, characterized in that the outer suction openings (38) in the suction tubes (75, 75') lie in planes (E1, E2) which, viewed in the horizontal direction and in the suction direction (SR) of the suction channel (SK), form an acute angle (w), and which, viewed in the vertical direction, converge toward one another above the suction channel (SK).
13. The carrier element (20) according to one of Claims 1 to 12, characterized in that the bearing elements (G) of the two suction inserts (18) of the half-shells (H1, H2) each have an additional radial support (52, 53) for the shaft (22), the radial support being provided adjacently in the area in which the half-shells (H1, H2) rest against one another in the installed position.
14. The carrier element (20) according to Claim 13, characterized in that at least one of the radial supports (52, 53) forms a positive-fit connection with the shaft (22), viewed in the circumferential direction of the shaft.
15. The carrier element (20) according to one of Claims 13 or 14, characterized in that the shaft (22) is provided with a flattened area (82), oriented in the longitudinal direction, for the passage of air in the area of the bearings (K) for the respective suction drum (17).
16. The carrier element (20) according to one of the preceding claims, characterized in that the particular suction insert (18) of the half-shells (H1, H2) is provided with a depression (X) which extends on the outer circumference of the suction insert, and which is situated in the area between the end-side face (SF) of the respective half-shell (H1, H2), with which the half-shells rest against one another, and the respective end-side face (84) of the suction drum (17) that protrudes beyond the suction insert (18).
17. The carrier element (20) according to one of the preceding claims, characterized in that each of the two half-shells (H1, H2) is provided with a circumferential flange (45, 46), wherein, viewed in the installed position of the two half-shells (H1, H2), the flange (45) of the second half-shell (H2) partially protrudes beyond the first half-shell (H1), and the flange (46) of the first half-shell (H1) completely protrudes beyond the flange (45) of the second half-shell (H2) and forms a positive-fit clamping connection with same.
18. A spinning machine, in particular a ring spinning machine, having two adjacently situated drawing units (2) having one output roller pair (7, 8) each, characterized in that the spinning machine includes the carrier element (20) according to one of Claims 1 to 17, each suction drum (17) being associated with the output roller pair (7, 8) of a drawing unit (2).

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