CH711549A1

CH711549A1 - Cleaning device for a compacting device.

Info

Publication number: CH711549A1
Application number: CH01353/15A
Authority: CH
Inventors: Malina Ludek
Original assignee: Rieter Ag Maschf
Priority date: 2015-09-18
Filing date: 2015-09-18
Publication date: 2017-03-31
Also published as: CN106544764A; EP3144420A1; CN106544764B; EP3144420B1

Abstract

The invention relates to a cleaning device for a compression device with a drive element (70) and a fiber processing element which is rotatably mounted about an axis of rotation and has a projection (72). The projection (72) cooperates with the drive element (70) and forms a gear stage (G2). The gear stage (G2) is designed in such a way that the fiber processing element and the drive element (70) rotate at a different rotational speed. According to the invention, the cleaning device comprises a cleaning element (76) which is arranged in the direction of the axis of rotation on an end face (82) of the drive element (70) facing away from the fiber processing element and is non-rotatably connected to the projection (72). Furthermore, the cleaning element (76) has at least one stripping edge (78)

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a cleaning device for a compression device with a drive element and a fiber processing element which is rotatably mounted about an axis of rotation and which has a projection which interacts with the drive element and forms a gear stage which is designed such that the projection and, The driving element can rotate at a different rotational speed.

SUMMARY OF THE INVENTION The invention relates to a device for compressing a fiber sliver on a spinning machine with a driven and circumferential compression element which is acted upon by suction air and has a projection which interacts with a drive element which is arranged in an operating position with a driven element of the spinning machine Spinning machine to form a drive connection to form a transmission stage.

[0003] A disadvantage of the device according to WO 2012 068 692 A1 is that during the compression process, individual fibers are detached from the fiber material to be compacted and are deposited on the circumference of the compression element. These fibers can move in the direction of the outer end face of the compression element up to the drive element. The movement of the fibers can be generated, for example, by the rotation of the compression element or by the air flow arising during the rotation of the compression element. In this case, there is a risk that fibers which reach the outer end face of the drive element can move up to the outer circumference of the extension and fix themselves on the latter.

This has the consequence that the inner surface of the drive element is no longer in direct contact with the outer circumference of the extension, as a result of which a continuous transmission of the drive torque from the drive element to the compression element is no longer ensured. As a result, the speed ratio between the compression element and the lower output roller of the drafting apparatus changes, which adversely affects the quality of the compaction of the fiber material.

There is therefore a need to remove the drive element from the compression element after a certain running time of the compression device and to free the outer end face of the drive element or the outer circumference of the extension from the accumulated fibers. This is associated with a high maintenance effort and high standstill times of the spinning machine.

SUMMARY OF THE INVENTION The object of the invention is therefore to provide a compression device for compressing a fiber product on a spinning machine such that fibers which do not separate from the fiber material to be compacted during the compaction process do not deposit in the region of the outer end face of the drive element.

In order to achieve the object, it is proposed to provide a cleaning device for the compression device, wherein the cleaning device comprises a cleaning element which is arranged in the direction of the axis of rotation on an end side of the drive element facing away from the fiber processing element and is connected non-rotatably to the attachment Has at least one stripping edge which runs in a plane parallel to the end face of the drive element and has an increasing distance from the axis of rotation in its course. The stripping edge of the cleaning element has the advantageous functional effect that those fibers which reach the outer end face of the drive element are stripped directly from the stripping edge of the cleaning element, So that these fibers can no longer move as far as the outer circumference of the extension and can be immobilized thereon. Consequently, the compacting device can be operated continuously and therefore there is no need for maintenance and no high standstill times of the spinning machine have to be taken into account. Accordingly, for the known compacting device with the cleaning device with a stripping edge according to the invention, a higher productivity can be achieved in compressing the fiber material.

[0008] Within the scope of the present application, the edge of the cleaning element is understood as the stripping edge, which edge, in the direction of rotation of the cleaning element, actively transports the fibrous material actively away. All other edges on the cleaning element, which do not have a conveying function with respect to the direction of rotation, are not regarded as stripping edges. Of course, when reversing the direction of rotation of the fiber processing element, the appropriately assigned axis-symmetrical other edge with the distance-conveying function is to be understood as a stripping edge.

[0009] Preferably, the stripping edge at least partially protrudes the projection in the radial direction relative to the axis of rotation. This has the advantageous effect that, viewed in the direction of rotation of the cleaning element, the stripping edge optimally strips the fibers on the end face of the drive element.

[0010] The rotationally fixed connection of the cleaning element to the attachment is preferably a snap-fit connection. The snap connection has the advantage that no tool is necessary for replacing the cleaning element, in the event of a defect, since the exchange can instead take place manually. Thus the exchange by the snap connection is fast and uncomplicated.

[0011] Alternatively, the rotationally fixed connection of the cleaning element to the attachment could be a screwed, riveted or adhesive connection. Although these joining techniques are conceivable, they are rather impractical when attached or exchanged.

[0012] The cleaning element preferably has several stripping edges, which are arranged star-shaped. The majority of star-shaped stripping edges have the advantage that, viewed in the direction of rotation of the cleaning element, the stripping edges optimally strip the fibers on the end face of the drive element. The star-shaped arrangement also permits a surface-covering cleaning of the fibers on the end face of the drive element. In this way, an accumulation of the fibers on the outer circumference of the attachment is at least approximately completely prevented.

[0013] The cleaning element preferably has three wiping edges. In this embodiment, the cleaning element is preferably designed as an equilateral triangle so that the three stripping edges, as seen in the direction of rotation, strip off the fibers on the end face of the drive element offset by 120 °.

[0014] Further preferably, the cleaning element has four stripping edges. In this embodiment, the cleaning element is preferably designed as a diamond, so that the four wiping edges, as seen in the direction of rotation, strip off the fibers on the end face of the drive element offset by 90 ° relative to one another.

[0015] The stripping edge is preferably concave. This has the advantageous effect that the fibers are transported in front of the stripping edge in the direction of rotation of the cleaning element. In this way, an optimum removal of the fibers along the concave stripping edge is possible.

[0016] Further advantages of the invention can be gathered from an exemplary embodiment described and illustrated below.

[0017] FIG.

1 is a schematic side view of a spinning station of a ring spinning machine with a drafting unit and a subsequent compression device;

FIG. 2 is an enlarged partial view X according to FIG. 1 with a rotatably mounted suction drum of a compression device and drive element attached to a carrier;

FIG. 3 is an enlarged side view Y according to FIG. 2 of a drive device with a friction wheel;

4a-d show four schematic exemplary embodiments in each case in a perspective view of cleaning elements according to the invention.

1 shows a schematic side view of a spinning station 10 of a spinning machine (ring spinning machine) with a drafting unit 12 which is provided with an input roller pair 14, 16, a center roller pair 18, 20 and an output roller pair 22, 24. The lower roller pairs 14, 18, 22 are, as schematically indicated, connected to a drive A. The upper roller pairs 16, 20, 24 are designed as pressure rollers and are mounted such that they can rotate on a pivotably mounted pressure arm 19. The pressure arm 19 is pivotally mounted about an axis 21 and is acted upon by a spring element F. FIG. The printing rollers 16, 20, 24, or a belt 27 are driven by means of a belt 25 via friction, via the driven lower rollers 14, 18,

A fiber material fed to the drafting unit 12 is subjected to a preliminary draft in the form of a sliver L between the input roller pair 14, 16 and the middle roller pair 18, 20. The main warp of the fiber web L is produced between the pair of central rollers 18, 20 and the output roller pair 22, 24, the output roller 22 having a substantially higher rotational speed than the center roller 18. The drawn fibrous material V discharged from the outlet roller pair 22, 24 is deflected downwards and reaches the region of a suction zone SZ of a downstream fiber processing device in the form of a suction drum 26 as part of a compression device VM.

[0020] The suction drum 26 is rotatably mounted in the region of its outer end on a shaft 28 having a rotational axis 34. The shaft 28 is fastened in a receptacle 29 of a carrier 32. The shaft 28 has a somewhat larger diameter in the region of the receptacle 29, whereas the ends of the shaft 28 extending from this receptacle 29 on either side have a tapered diameter and serve to accommodate bearings. The rotatable mounting of the suction drum 26 is explained in detail below in connection with FIG.

On its end facing the spinning machine, the carrier 32 is provided with a U-shaped or fork-shaped end piece 38 which rests with its inner surface on a partial region of the outer circumference of a suction tube 40.

The suction pipe 40 is connected to a central main duct 44 via one or more connecting ducts 42. This main channel 44 is connected to a vacuum source SP, which can be controlled by a control unit ST.

Following the suction zone SZ, a clamping roller 46 is provided for the suction drum 26, which is supported by a pressure load on the suction drum 26 and forms a clamping line P therewith. In this case, the clamping roller 46 is rotatably mounted on an axle 48 which is fastened to a bearing element 50 which is connected to a spring element 54 via screws 52 (or other fastening elements). The spring element 54 is fastened to the carrier 32 via schematically illustrated screws 52 (or other fastening elements).

The clamping line P simultaneously forms a so-called "rotation locking gap", from which the fibrous material is fed in the conveying direction FS in the form of a compressed yarn FK with rotation distribution of a schematically shown ring spinning device. This is provided with a ring 56 and a rotor 58, the yarn being wound onto a sleeve 60 to form a coil 62 (Kops). A thread guide 64 is arranged between the clamping line P and the rotor 58. The ring 56 is fastened to a ring frame 66 which performs an up-and-down movement during the spinning process.

2, the suction drum 26 is located in a working position in which the outer circumference U of a drive element in the form of a friction wheel 70 rests on the outer circumference U7 of the driven output roller 22 via a correspondingly applied pressure load. In this way, the friction wheel 70 is driven by friction from the output roller 22 in a first gear stage G1.

The friction wheel 70 transmits the drive in a second transmission stage G2 to an annular extension 72 of the suction drum 26. This takes place at the location where the inner surface IF is aligned with the inner diameter D2 of the friction wheel 70 and the outer circumference AU of the extension 72 with the outside diameter D1. The rotational axis of the friction wheel 70 is offset axially parallel to the axis of rotation 34 of the projection 72 so that, with respect to the second transmission stage G2, the friction wheel 70 driven by the output roller 22 rotates with a different rotational speed as the suction drum 26.

In the known prior art, a circular cover cap is arranged disadvantageously in the direction of the axis of rotation 34 on an end face 82 of the friction wheel 70 facing away from the suction drum 26 and is connected to the projection 72 in a rotationally fixed manner.

Correspondingly, during the compacting process, individual fibers can be separated from the fiber web V to be compacted, deposited on the circumference of the suction drum 26 and moved in the direction of the end face 82 of the friction wheel 70 and thus inserted into the axial gap between the end face 82 of the friction wheel 70 and the friction wheel 70 Circular cap. The movement of the fibers can be generated, for example, by the rotation of the suction drum 26 or the air flow generated during the rotation of the suction drum 26. In this case, there is the danger that fibers which enter the axial gap can move up to the outer circumference AU of the extension 72 and fix it there. As a result, the inner surface IF of the friction wheel 70 is no longer in direct contact with the outer circumference AU of the projection 72, Whereby a continuous transmission of the drive torque from the friction wheel 70 to the suction drum 26 is no longer ensured. As a result, the speed ratio between the suction drum 26 and the lower exit roller 22 of the drafting unit 2 changes. As a result, the fiber material V to be compacted is compressed in the suction zone SZ, which has a negative effect on the quality of the compaction of the fiber material V. There is therefore a need to remove the friction wheel 70 from the suction drum 26 after a certain running time of the compression device VM and to free the outer circumference AU of the extension 72 from the accumulated fibers. This is associated with a high maintenance effort and high standstill times of the spinning machine. As a result, the speed ratio between the suction drum 26 and the lower exit roller 22 of the drafting unit 2 changes. As a result, the fiber material V to be compacted is compressed in the suction zone SZ, which has a negative effect on the quality of the compaction of the fiber material V. There is therefore a need to remove the friction wheel 70 from the suction drum 26 after a certain running time of the compression device VM and to free the outer circumference AU of the extension 72 from the accumulated fibers. This is associated with a high maintenance effort and high standstill times of the spinning machine. As a result, the speed ratio between the suction drum 26 and the lower exit roller 22 of the drafting unit 2 changes. As a result, the fiber material V to be compacted is compressed in the suction zone SZ, which has a negative effect on the quality of the compaction of the fiber material V. There is therefore a need to remove the friction wheel 70 from the suction drum 26 after a certain running time of the compression device VM and to free the outer circumference AU of the extension 72 from the accumulated fibers. This is associated with a high maintenance effort and high standstill times of the spinning machine. There is therefore a need to remove the friction wheel 70 from the suction drum 26 after a certain running time of the compression device VM and to free the outer circumference AU of the extension 72 from the accumulated fibers. This is associated with a high maintenance effort and high standstill times of the spinning machine. There is therefore a need to remove the friction wheel 70 from the suction drum 26 after a certain running time of the compression device VM and to free the outer circumference AU of the extension 72 from the accumulated fibers. This is associated with a high maintenance effort and high standstill times of the spinning machine.

In order to counteract these disadvantages from the prior art, a cleaning element 76 according to the invention, as shown in FIG. 2 purely schematically and in dashed lines, is used instead of the circular cover cap. Correspondingly, the cleaning element 76 according to the invention is arranged in the direction of the axis of rotation 34 on the end face 82 of the friction wheel 70 facing away from the screen drum 26 and is connected to the projection 72 in a rotationally fixed manner. Consequently, the cleaning element 76 rotates at the same rotational speed as the suction drum 26 and differently from the friction wheel 70, all elements 70, 72, 76 being driven in the same direction of rotation.

[0030] The cleaning element 76 is preferably manufactured from polyamide of the PA12 type and has opaque properties. This means that the cleaning element is preferably transparent, translucent or clear. Thus, through the cleaning element 76, it can be directly seen on the face 82 of the friction wheel 70 and the projection 72.

The cleaning element 76 has a stripping edge 78 with respect to the direction of rotation of the projection 72. As shown in FIG. 3, the stripping edge 78 runs parallel to the front face 82 of the friction wheel 70 in a plane (shown in phantom) and has an increasing distance from the axis of rotation 34 of the shaft 28. The stripping edge 78 follows the rotary path of the projection 72 as viewed in the direction of rotation and can thereby directly convey away or scrape away fibers on the face 82 of the friction wheel 70 due to the different rotational speed between the friction wheel 70 and the extension 72. As viewed in the direction of rotation of the cleaning element 76, only those edges of the cleaning element 76 serve as stripping edges 78, which run in the direction of rotation since only these can convey the fibers away or stripe away. In the case,

In the manner according to the invention, fibers are now prevented from moving away from the end face 82 of the friction wheel 70 in the direction of the outer circumference AU of the extension 72, as is disadvantageous in the known prior art.

FIG. 3 shows that the suction drum 26 is rotatably mounted on the shaft 28 in the region of its outer end via bearing K. For the axial fixing of the suction drum 26 on the shaft 28, a securing ring 74 is mounted on the shaft 28, which prevents the axial displacement of the suction drum 26 during operation.

Claims

For fixing the cleaning element 76 to the annular projection 72 of the suction drum 26, the cleaning element 76 has, on the side facing the extension 72, a spring finger 80 which is shaped like a crown in the form of a crown (see FIGS. 4a to 4d). The spring fingers 80 of the cleaning element 76 project into the clear width of the annular projection 72 of the suction drum 26. The outer dimension of the annular projection 72 is selected in such a way that it exerts a clamping action within the clear width of the projection 72 in the position shown in FIG. As shown schematically, the spring fingers 80 can be provided with additional radially protruding detent lugs 84, which engage the circumferential width of the projection 72 for fixing the cleaning element 76 into circumferential depressions 86. The friction wheel 70 is held in its position in the axial direction on the shaft 28 by the cleaning element 76. In FIG. 4a, the cleaning element 76 from FIG. 2 is shown in a perspective view. In this case, the spring fingers 80 are clearly shown with snap-in lugs 84 for fastening the cleaning element 76 in the clear width of the extension 72 as a snap-fit connection. In this exemplary embodiment, the outer shape of the cleaning element 76 is designed as a triangle. Correspondingly, in the direction of rotation (indicated by an arrow), the cleaning element 76 has three stripping edges 78a, 78b, 78c. In the present exemplary embodiment, the stripping edges 78 are formed in a soldering relationship to the plane 88. Alternatively, it is also conceivable to form the stripping edges 78 concavely. With regard to the cleaning element 76, it is also conceivable, as shown in FIGS. 4b and 4c, to be star-shaped with three stripping edges 78a, 78b, 78c or four stripping edges 78a, 78b, 78c, 78d or as shown in FIG With two stripping edges 78a, 78b with respect to the direction of rotation of the lug. However, other embodiments of a cleaning element 76 are also possible which are not explicitly described in this application, but are obvious to the person skilled in the art in order to obtain the desired cleaning effect on the face of the friction wheel. claims 78b with respect to the rotational direction of the lug. However, other embodiments of a cleaning element 76 are also possible which are not explicitly described in this application, but are obvious to the person skilled in the art in order to obtain the desired cleaning effect on the face of the friction wheel. claims 78b with respect to the rotational direction of the lug. However, other embodiments of a cleaning element 76 are also possible which are not explicitly described in this application, but are obvious to the person skilled in the art in order to obtain the desired cleaning effect on the face of the friction wheel. claims

1. A cleaning device for a compression device with a drive element and a fiber processing element, which is rotatably mounted around an axis of rotation, with a projection, wherein the projection interacts with the drive element and forms a transmission stage (26) and the drive element (70) rotate at a different rotational speed, characterized in that the cleaning device comprises a cleaning element (76), which faces away from the fiber processing element (26) in the direction of the axis of rotation (76) of the drive element (70) and is connected non-rotatably to the projection (72), wherein the cleaning element (76) has at least one stripping edge (78)Which extends in a plane (88) parallel to the end face (82) of the drive element (70) and has an increasing distance from the axis of rotation in its course.

2. Cleaning device according to claim 1, characterized in that the stripping edge (78) protrudes at least sectionally the projection (72) in the radial direction relative to the axis of rotation.

3. Cleaning device according to claim 1, characterized in that the rotational connection of the cleaning element (76) with the projection (72) is a snap-fit connection.

4. Cleaning device according to claim 1, characterized in that the cleaning element (76) has a plurality of stripping edges (78) which are arranged star-shaped.

5. Cleaning device according to claim 1, characterized in that the cleaning element (76) has three stripping edges (78a, 78b, 78c).

6. The cleaning device as claimed in claim 1, wherein the cleaning element has four stripping edges (78a, 78b, 78c, 78d).

7. Cleaning device according to claim 1, characterized in that the stripping edge (78) is convex.

8. A spinning machine with a plurality of compacting devices, characterized in that at least one compacting device has a cleaning device according to one of claims 1 to 7.