Top apron cradle for an apron drafting system of a textile machine

Abstract

A top apron cradle for an apron drafting system of a textile machine with an apron guide unit for circumferentially guiding a top apron looped around a top roller of the apron drafting system. The apron guide unit has an apron guide section for guiding the top apron, the apron guide section having an entrance section and a deflection section. The apron guide unit has a receptacle, which is assigned to the entrance section, for a replaceable tensioning element which can be brought into pressure contact with an inner side of the top apron, and the tensioning element. For guiding the top apron via the tensioning element and the deflection section, the receptacle and the tensioning element replaceably accommodated in the receptacle are formed at a distance from the area of the apron guide section enclosed by the tensioning element and the deflection section.

Claims

1. A top apron cradle for an apron drafting system of a textile machine with an apron guide unit for circumferentially guiding a top apron looped around a top roller of the apron drafting system, with an apron guide section for guiding the top apron, the apron guide section having an entrance section for receiving the top apron and a deflection section spaced apart from the entrance section for deflecting the guided top apron, and a top roller bearing unit for bearing the top apron cradle and positioning the apron guide unit downstream of the top roller in the circumferential direction of the top apron, characterised in that the apron guide unit has a receptacle, which is assigned to the entrance section, for a replaceable tensioning element which can be brought into pressure contact with an inner side of the top apron, and the tensioning element, in which case the receptacle and the tensioning element replaceably accommodated in the receptacle for guiding the top apron via the tensioning element and the deflection section are formed at a distance from the area of the apron guide section enclosed by the tensioning element and the deflection section.

2. The top apron cradle according to claim 1, characterised in that the apron guide section has, at its end forming the deflection section, a further receptacle which is configured for receiving a replaceable deflection element for deflecting the circumferentially guided top apron, as well as the deflection element.

3. The top apron cradle according to claim 2, characterised in that the receptacle and/or the further receptacle is formed by two guides that are spaced apart for lateral guidance of the top apron, and that the tensioning element or the deflection element is configured as a guide bar which is arranged in the region between the two guides and extending in its longitudinal axis direction in the direction of the two guides until the receptacle or further receptacle, the two guides being arranged at a lateral edge of the apron guide section and being integrally formed with that.

4. The top apron cradle according to claim 1, characterised in that the tensioning element and/or the deflection element has at least one retaining pin and the receptacle or the further receptacle is configured to accommodate the retaining pin for interchangeably accommodating the tensioning element or the deflection element, the retaining pin, of which there is at least one, extending transversely to a guide bar of the tensioning element or of the deflection element which guide bar guides the top apron.

5. The top apron cradle according to claim 1, characterised in that the receptacle is part of a support unit associated with the apron guide unit, on which the tensioning element is detachably arranged, the support unit being supported on the top apron cradle.

6. The top apron cradle according to claim 1, characterised in that the tensioning element in the receptacle and/or the deflection element in the further receptacle is pretensioned in a direction opposite to the apron guide section.

7. The top apron cradle according to claim 6, characterised in that the receptacle and/or the further receptacle has a spring unit assigned to it which is configured to adjust the pretension acting on the tensioning element or the deflection element.

8. The top apron cradle according to claim 1, characterised in that the receptacle and/or the further receptacle is configured for interchangeably accommodating at least one adapter element, in which case the adapter element, of which there is at least one, can be coupled to the tensioning element and/or to the deflection element in order to change the position of the tensioning element or the deflection element relative to the apron surface section in the coupled and accommodated condition.

9. The top apron cradle according to claim 1, characterised in that the textile machine is a pre-spinning machine, a ring spinning machine or an air-spinning machine.

10. The top apron cradle according to claim 6, characterised in that pretensioned is spring-pretensioned.

11. An apron drafting system for a textile machine having a drivable first roller pair and a drivable second roller pair for drafting a fibre band, the first and second roller pairs being arranged at a distance from one another in the fibre band transport direction between a top and bottom roller of each roller pair for clamping transport of the fibre band, the first and second roller pairs being drivable at different rotational speeds in the operating condition of the apron drafting system to form a drafting zone located between the clamping lines of the first and second roller pairs, a top apron cradle, which is arranged between the first and second roller pairs and, in the drafting zone, circumferentially guides a top apron having a top roller of the first roller pair looped around it circumferentially along the fibre band transport direction, characterised in that the top apron cradle is a top apron cradle according to claim 1.

12. The apron drafting system according to claim 11, characterised in that the textile machine is a roving frame, a ring spinning machine or an air-spinning machine.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] An embodiment example of the present invention is explained below with reference to the drawings. In the drawings:

[0025] FIG. 1 is a perspective view of a top apron cradle;

[0026] FIG. 2a illustrates a first embodiment of an adapter element;

[0027] FIG. 2b illustrates a second embodiment of an adapter element and

[0028] FIG. 2c illustrates an third embodiment of an adapter element.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] FIG. 1 shows a perspective view of a top apron cradle 1 of an apron drafting system not shown here, according to an embodiment example.

[0030] The top apron cradle 1 has two top roller bearing units 2 at a distance from one another, which are connected to a base carrier 9 of an apron guide unit 4.

[0031] The apron guide unit 4 has an apron guide section 11 which is laterally bounded by bar-like guiding means 5 which, in an operating condition of the top apron cradle 1, bounds a lateral running path of an endless top apron which is not shown here. During operation, the top apron is guided over the top roller 3 in the direction of the apron guide section 11. For receiving the top apron, the apron guide section 11 has an entrance section 11a and a deflection section 6 spaced apart from the latter. The deflection section 6 has a bar-shaped deflection element 6a which the top apron is guided around. The deflection element 6a is held in a replaceable manner in a further receptacle which is not shown. The deflection element 6a is configured as a guide bar. Depending on the embodiment of the deflection element 6a, the distance from a downstream top roller of an output roller pair, which is not shown, of the apron drafting system can be variably adjusted in the fibre band transport direction.

[0032] To generate a desired apron tension, a tensioning element 7 in the form of a guide bar extends between the guiding means 5 and is detachably connected to the guiding means 5. In operation, the tensioning element 7 rests against an inner side of the top apron and causes the apron pretension via its contact area. The tensioning element 7 is interchangeably held in receptacles 10, the receptacles 10 being formed by the guiding means 5 according to this preferred embodiment example. Alternatively, according to an embodiment example not shown, the receptacle can be part of a support unit associated with the apron guide unit 4, on which the tensioning element 7 is detachably arranged, the support unit being supported on the top apron cradle 1. In this case, the receptacle can be arranged adjacent or next to the guiding means 5 in the guiding direction.

[0033] The apron tension as well as the distance from the outlet roller can be changed by the arrangement of different adapter elements 8a, 8b, 8c (see FIGS. 2a to 2c) correspondingly on the tensioning element 7 or the deflection element 6a, in which case the respective adapter element 8a, 8b, 8c can be accommodated by the receptacle 10 or the further receptacle. The adapter elements 8a, 8b, 8c, when in the accommodated status and coupled to the tensioning element 7 or the deflection element 6a, cause a change in position of the same relative to the apron surface section 11 and thus, depending on the adapter element 8a, 8b, 8c used or its embodiment, the apron tension or the distance to the outlet roller, correspondingly. The adapter elements 8a, 8b, 8c can be detachably connected to the tensioning element 7 and/or the deflection element 6a, allowing them to be pushed on and thus easily removed from the element if required.

LIST OF REFERENCE SIGNS

[0034] 1 Top apron cradle [0035] 2 Top roller bearing unit [0036] 3 Top roller [0037] 4 Apron guide unit [0038] 5 Guiding means [0039] 6 Deflection section [0040] 6a Deflection element [0041] 7 Tensioning element/guide bar [0042] 8a, 8b, 8c Adapter element [0043] 9 Base carrier [0044] 10 Receptacle [0045] 11 Apron guide section [0046] 11a Entrance section