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.

What is claimed is: 
     
         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.