CN107109713B

CN107109713B - Cage assembly with guide elements

Info

Publication number: CN107109713B
Application number: CN201580051149.5A
Authority: CN
Inventors: H-J.科斯特
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2014-09-23
Filing date: 2015-09-18
Publication date: 2020-02-21
Anticipated expiration: 2035-09-18
Also published as: CN107109713A; WO2016046712A1; CH710141A1; EP3198066B1; EP3198066A1

Abstract

The invention relates to a holder assembly (1) for a drafting mechanism of a spinning machine, having a holder (3) for guiding two guide belts (4a, 4b) surrounding a double pressure roller (2), having a holder support (13) which is releasably attached to a central attachment point (23) of the holder (3) and has two side faces (35a, 35b) facing away from one another, and having a guide element (14) whose respective end (14a, 14b) projects beyond the two side faces (35a, 35b) of the holder support (13), wherein the holder (3) has a deflection edge (8a, 8b) for deflecting the guide belts (4a, 4b) in each case. In order to prevent the guide element (14) from rotating around the central attachment point (23) of the cage (3), the cage assembly (1) has at least one bearing element (25) for bearing a respective end (14a, 14b) of the guide element (14) between the respective deflecting edge (8a, 8b) and the guide element (14) at a distance (24) from the central attachment point (23) of the cage (3).

Description

Cage assembly with guide elements

The invention relates to a holder assembly for a drafting mechanism of a spinning machine, having a holder for guiding two guide belts which loop around a double pressure roller, having a holder support which is releasably attached to a central attachment point of the holder and has two sides which face away from one another, and having guide elements whose respective ends project beyond the two sides of the holder support, wherein the holder has a deflection edge for deflecting the guide belts in each case.

A cage assembly of this type is known from DE 102009018125 a1 and CN 201756611. In these documents, a guide element in the form of a round bar is releasably attached to the holder by means of a holder support. In this regard, the cage supports (which are referred to as "gauge blocks" in CN 201756611U) are attached to the cage by a snap-fit connection, independent of the guide elements. For this purpose, the cage has a central attachment point in the form of a journal-like projection. Instead, the cage support has a recess associated with the journal-like projection. The cage support with the guide elements can thereby be clamped very easily onto the cage and released again smoothly from the cage. Furthermore, the cage support has a support surface on its underside for direct contact with the cage. The bearing surface, by means of which the cage support bears directly against the cage, together with the snap-in connection ensures a precise positioning of the cage support and the guide element on the cage during mounting. During the drafting in the drafting zone of the drafting device, the two fiber bundles guided on the holder assembly of two adjacent drafting device units move past the guide element. In this connection, the guide elements are positioned in the drafting zone by the holder supports such that the fiber bundles deviate slightly from their actual drafting direction. In this connection, the guide element exerts a guiding force on the fiber bundle in the drafting zone. Instead, the fiber bundles each exert a force on the guide element, which force is caused by friction between the two fiber bundles and the guide element. In fact, it has now been shown that the forces acting on the guide element differ in each case, i.e. that the two forces acting at a distance from each other on the guide element are at different levels. This has the negative effect that during the drafting of the fibre bundle, a torque acts on the guide element 14. The torque acting on the guide element cannot be compensated for because the cage support can be releasably attached to the journal-like projection of the cage. As a result, the holder support rotates together with the guide element around the journal-like projection of the holder during the drafting process. In this way, an inaccurate positioning of the guide element relative to the holder occurs during drafting. This has a negative effect on the quality of the fiber bundles drafted next to one another.

The invention is therefore based on the object of improving a holder assembly of the type described to the effect that the guide element is prevented from rotating about the central attachment point of the holder during drafting.

This task is achieved by: the cage assembly has at least one support element for supporting a respective end of the guide element at a distance from a central attachment point of the cage between the respective deflecting edge and the guide element. The support element prevents the rotation of the holder support and the guide element around the central attachment point of the holder during drafting. In this way, it is ensured that the guide element is positioned precisely on the holder during drafting. In this connection, the distance of the support element from the central attachment point advantageously amounts to 20-50 mm. The distance from the central attachment point is calculated starting from the inner side of the support element facing the central attachment point.

It is also advantageous if the supporting element has a width in the direction of the respective deflecting edge of 2-10 mm. In this way, it is achieved that the guide element is sufficiently supported by the support element. Thereby preventing the guide element from rotating during drafting.

Furthermore, it has proven to be advantageous if the support element is connected to the cage at the respective deflection edge. In this connection, the supporting elements project from the respective deflecting edge in the direction of the respective end of the guide element. For example, the bearing elements are injection-molded onto the respective deflecting edges of the cage. The cage assembly with the support element can thus be produced in a cost-effective manner. Furthermore, it is possible for the bearing element to be releasably connected to the cage at the respective deflection edge, for example by a snap connection or a screw connection. In this way, there is the possibility of retrofitting existing cage assemblies with support elements.

Furthermore, it is advantageous if the bearing element has a bearing surface which bears a respective end of the guide element. In this connection, the bearing surface is located on the side of the bearing element directed towards the respective end of the guide element. The respective end of the guide element is able to adequately support itself on the support element by means of the support surface. Thereby preventing the guide element from rotating during drafting. Furthermore, the bearing surfaces ensure that the respective ends of the guide elements continue to be adequately supported on the bearing elements in the event of a change in the geometry of the holder support and a corresponding change in the position of the guide elements transversely to the direction of transport of the fiber strand.

Furthermore, it is advantageous if the support element is releasably attached to the respective end of the guide element, for example by means of a snap connection or a threaded connection. The respective end of the guide element can thereby support itself via the support element on the deflecting edge of the holder. The guide element is prevented from rotating. Furthermore, in this way, there is the possibility of retrofitting existing cage assemblies with support elements. Furthermore, it has proven to be advantageous if the bearing element is inserted onto the respective end of the guide element. In this way, there is also the possibility of retrofitting existing cage assemblies with support elements.

Finally, it is advantageous if the support element has a bearing for attachment to the guide element. In this regard, the abutment is configured to match the cross-sectional shape of the guide element. The support element can thus be simply pushed onto the respective end of the guide element by means of the abutment. The support extends across the entire width of the support element or only a portion of the width of the support element. Advantageously, the support is configured in a round or tear-drop shape.

Further advantages and features of the invention will become apparent from the following description of two exemplary embodiments.

In the drawings:

figure 1 is a perspective view of a holder assembly of a drafting mechanism for a spinning machine belonging to the prior art,

figure 2 is a cross-sectional view of a drafting mechanism of a spinning machine having the holder assembly shown in figure 1,

figure 3 is a perspective view of a holder assembly of a drafting mechanism for a spinning machine according to the present invention,

figure 4 is a partial side view X of the cage assembly shown in figure 3,

fig. 5 is a perspective view of still another holder assembly of the drafting mechanism for a spinning machine according to the present invention.

The holder assembly 1 shown in fig. 1 and 2 is essentially composed of two pressure rollers 2, a holder 3 and two

guide belts

4a and 4 b. The double pressure roller 2 is formed by two

upper rollers

5a and 5b, said two

upper rollers

5a and 5b being arranged to rotate freely on a fixed shaft 6. The cage 3 has a seat 7 for the shaft 6. The holder 3 further has two deflecting

edges

8a and 8b for deflecting the

guide strips

4a and 4 b. In addition, a lateral guide 9 for guiding the

belts

4a and 4b is provided on the holder 3.

The holder assembly 1 can be used for two adjacent drafting mechanism units of a drafting mechanism in a spinning machine, preferably a ring spinning machine. The cage assembly 1 is held on the shaft 6 in a stress bearing (not shown). The

upper rollers

5a and 5b are pressed against the lower roller 12 (fig. 2) which can be driven by means of stress bearings.

The holder assembly 1 shown in fig. 1 and 2 further comprises holder supports 13 and guide elements 14 for guiding two fibre tows 15. In this connection, the guide element 14 projects with its

respective end

14a, 14b out of two

sides

35a, 35b of the cage support 13 facing away from one another. The cage support 13 is attached to the cage 3 by means of a snap connection independently of the guide element 14. For this purpose, the cage 3 has a central attachment point 23 in the form of a journal-like projection 23. Conversely, the cage support 13 has a recess 29 associated with the journal-like projection 23. The cage support 13 can thus be clamped very easily together with the guide element 14 onto the cage 3 and released again from the cage 3. Furthermore, the cage support 13 has a cradle 31. By means of the abutment 31, the holder support 13 is pushed onto the front edge 32 of the holder 3 and positioned on the holder 3. The function of the cage supports 13 and of the guide elements 14 will be explained using fig. 2.

In fig. 2, a draft mechanism unit 10a is schematically shown. The holder assembly 1 is distributed with its upper roller 5a, holder 3 and guide strip 4a to the lower roller 12. The fiber strand 15 to be drafted runs through the roller pairs 12, 5a in the transport direction a. The guide belt 16 is distributed to the lower roller 12, which also passes through a lower belt guide 17. The lower roll 12 and the lower tape guide 17 extend through a plurality of adjacent draft mechanism units. The

roller pair

12, 5a is followed by a

roller pair

18, 19, which can be driven at a higher circumferential speed. The fiber bundle 15 is drafted between the

roller pair

12, 5a and the

roller pair

18, 19, so that after the

roller pair

18, 19, a fine fiber bundle is obtained. The drafting mechanism may comprise a further pair of rollers (not shown).

During drafting in the drafting zone 20 between the roller pairs, the fiber bundle 15 passes through the

guide belts

16, 4 a. In order to prevent the fiber bundle 15 from being compressed excessively by the

guide belts

16 and 4a in the draft zone 20, it is provided that the deflection edge 8a for the upper belt 4a is at a predetermined distance from the deflection edge 21 of the lower belt guide 17. This distance between the deflecting edges 21 and 8a is referred to as the mouth width. The mouth width can be varied by using different holder supports 13 with different geometries. In order to improve the guidance of the fiber bundle 15 in the drafting zone 20, a guide surface 22 of the guide element 14 is provided downstream of the

guide belts

16 and 4 a. The guide surface 22 is formed by the outer periphery of a rod extending through the entire cage assembly 1. The guide surface 22 is preferably positioned so that the fiber bundle 15 is easily deflected from a virtual connecting line formed by the shortest connecting portion between the exit of the

guide belts

16, 4a and the nip line of the

roller pair

18, 19. The guiding element 14 exerts a guiding force on the fiber bundle 15 during deflection in the drafting zone 20. Instead, the fiber bundle 15 exerts a force on the guide element 14, which force is caused by friction between the fiber bundle 15 and the guide element 14.

In fact, it has now been shown that the forces acting on the respective ends 14a, 14b of the guide element 14 at adjacent drafting mechanism units differ, i.e. that two fiber bundles 15 guided at a distance from each other exert forces of different magnitudes on the respective ends 14a, 14b of the guide element 14. This has the negative effect that during drafting, a torque acts on the guide element 14. In this connection, the torque acting on the guide element 14 cannot be compensated for, since the cage support 13 is in loose connection with the journal-like projection 23. As a result, the cage support 13 rotates together with the guide element 14 about the journal-like projection 23 during drafting (see arrow 30 in fig. 1). As a result, positional inaccuracies of the guide element 14 relative to the holder 3 occur during drafting. This has a negative effect on the quality of the fiber bundles 15 drafted next to one another.

Using fig. 3 and 4, a first embodiment of the cage assembly 1 of the present invention will be described in more detail. Similar to the cage assembly 1 shown in fig. 1 and 2, the cage assembly 1 of the present invention also comprises a cage support 13 with guiding elements 14 for guiding the fiber bundles 15. In this connection, the guide element 14 projects with its

respective end

14a, 14b out of two

sides

35a, 35b of the cage support 13 facing away from one another. The cage support 13 is attached to the cage 3 by means of a snap connection independently of the guide element 14. For this purpose, the cage 3 also has a central attachment point 23 in the form of a journal-like projection 23. Conversely, the cage support 13 has a recess 29 associated with the journal-like projection 23. The cage support 13 can thereby be clamped very easily together with the guide element 14 onto the cage 3 and released again from the cage 3. The cage carrier 13 also has a cradle 31 for the cage 3. By means of the abutment 31, the holder support 13 is pushed onto the front edge 32 of the holder 3 and positioned on the holder 3. In contrast to the cage assembly belonging to the prior art shown in fig. 1 and 2, support elements 25a, 25b for supporting the respective ends 14a, 14b of the guide element 14 are provided between the

respective deflecting edges

8a, 8b and the guide element 14, at a distance 24 from the journal-like projection 23 or the central attachment point 23 of the cage 3. The bearing elements 25a, 25b are injection-molded onto the

respective deflecting edges

8a, 8b of the cage 3. In this regard, the distance 24 of the support elements 25a, 25b from the central attachment point 23 amounts to 35 mm. The distance 24 from the central attachment point 23 is calculated starting from the inner sides 33a, 33b of the support elements 25a, 25b facing the central attachment point 23. The support elements 25a, 25b prevent the rotation of the holder support 13 and the guide element 14 around the central attachment point 23 of the holder 3 during drafting. In this way, it is ensured that the guide element 14 is accurately positioned on the holder 3 during drafting. The supporting elements 25a, 25b have a width 16 of 8mm in the direction of the deflecting

edges

8a, 8 b. In this way, it is achieved that the

respective end

14a, 14b of the guide element 14 is sufficiently supported on the cage 3 by means of the support elements 25a, 25 b. As is evident from fig. 4, the bearing elements 25a, 25b have bearing surfaces 28 for bearing the respective ends 14a, 14b of the guide element 14. In this connection, the bearing surface 28 is located on the side facing the guide element 14. The

respective end

14a, 14b of the guide element 14 can adequately support itself on the support elements 25a, 25b by means of the support surface 28. Furthermore, the bearing surfaces 28 ensure that the respective ends 14a, 14b of the guide element 14 continue to be adequately supported on the bearing elements 25a, 25b in the event of a change in the geometry of the cage support 13 and a corresponding change in the position of the guide element 14 transversely to the transport direction a of the fiber bundle 15.

Using fig. 5, a second embodiment of the cage assembly 1 of the present invention will be described in more detail. Similar to the cage assembly 1 shown in fig. 3 and 4, the second cage assembly 1 of the present invention also comprises a cage support 13 with guide elements 14 for guiding the fiber bundle 15. In this connection, the guide element 14 projects with its

respective end

14a, 14b out of two

sides

35a, 35b of the cage support 13 facing away from one another. The cage support 13 is attached to the cage 3 by means of a snap connection independently of the guide element 14. For this purpose, too, the cage 3 has a central attachment point 23 in the form of a journal-like projection 23. Conversely, the cage support 13 has a recess 29 associated with the journal-like projection 23. The cage support 13 can thereby be clamped very easily together with the guide element 14 onto the cage 3 and released again from the cage 3. The cage carrier 13 also has a cradle 31 for the cage 3. By means of the abutment 31, the holder support 13 is pushed onto the front edge 32 of the holder 3 and positioned on the holder 3.

In contrast to the exemplary embodiment of fig. 3 and 4, the support elements 25a, 25b are releasably attached to the respective ends 14a, 14b of the guide element 14. In this connection, the support elements 25a, 25b are inserted onto the respective ends 14a, 14b of the guide element 14. For this purpose, the support elements 25a, 25b have a seat 34, which extends through a portion of the width 26 of the support elements 25a, 25 b. The support 34 is configured to be round, i.e. to match the cross-sectional shape of the guide element 14. The support elements 25a, 25b can be easily pushed onto the respective ends 14a, 14b of the guide element 14 by means of the abutment 34. The

respective end

14a, 14b of the guide element 14 can support itself on the

respective deflecting edge

8a, 8b of the cage 3 by means of the support element 25a, 25 b. In this way, the guide element 14 is prevented from rotating around the journal-like projection 23 during drafting. As in the previous exemplary embodiment, the bearing elements 25a, 25b are arranged at a distance 24 from the journal-like projection 23 or the central attachment point 23 of the cage 3. The distance 24 from the central attachment point 23 is calculated starting from the inner sides 33a, 33b of the support elements 25a, 25b facing the central attachment point 23. In the case of retrofitting an existing cage assembly 1, it is now not necessary to replace the cage 3. The support elements 25a, 25b are inserted only onto the respective ends 14a, 14b of the guide element 14. Thus, retrofitting of existing cage assemblies can be carried out using the bearing elements 25a, 25b in a very simple and cost-effective manner.

Claims

1. A holder assembly (1) for a drafting mechanism of a spinning machine, having a holder (3) for guiding two guide belts (4a, 4b) encircling a double pressure roller (2), having a holder support (13) which is releasably attached to a central attachment point (23) of the holder (3) and has two side faces (35a, 35b) facing away from each other, and having a guide element (14) whose respective end (14a, 14b) projects out of the two side faces (35a, 35b) of the holder support (13), wherein the holder (3) has a deflecting edge (8a, 8b) for deflecting the guide belts (4a, 4b) in each case, characterized in that the holder assembly (1) has at least one support element (25) for deflecting the guide elements (14) between the respective deflecting edge (8a, 8b) at a distance (24) from the central attachment point (23) of the holder (3), supporting respective ends (14a, 14b) of the guide element (14).

2. Cage assembly according to claim 1, characterized in that the supporting elements (25) have a width (26) in the direction of the respective deflecting edge (8a, 8b) of 2-10 mm.

3. Cage assembly according to claim 1 or 2, characterized in that the bearing elements (25) are connected to the cage (3) at the respective deflecting edge (8a, 8 b).

4. A cage assembly according to claim 3, wherein the support element (25) is releasably connected to the cage (3) at the respective deflecting edge (8a, 8 b).

5. Cage assembly according to claim 1 or 2, characterized in that the bearing elements (25) have bearing surfaces (28) for bearing the respective ends (14a, 14b) of the guide elements (14).

6. Cage assembly according to claim 1 or 2, characterized in that the support element (25) is releasably attached to the respective end (14a, 14b) of the guide element (14).

7. Cage assembly according to claim 6, characterized in that the bearing elements (25) are inserted onto the respective ends (14a, 14b) of the guide elements (14).

8. Cage assembly according to claim 6, characterized in that the support element (25) has a seat (34) for attachment to the guide element (14).

9. Holder assembly according to claim 8, characterized in that the seat (34) is configured as a circle.

10. The holder assembly of claim 8, wherein the seat (34) is configured in a teardrop shape.

11. Drafting mechanism of a textile machine, with a holder assembly (1) according to any of claims 1 to 10.