Air jet spinning machine and drafting system unit for a spinning unit of an air jet spinning machine

Abstract

An air jet spinning machine and a drafting system unit for a spinning unit produce a thread or roving from a supplied fiber strip, with a front roller pair including a front top roller on a load carrier and a driven front bottom roller on a bottom roller carrier, and a bearing element arranged on the bottom roller carrier for movably bearing an air jet spinning nozzle. A reliable pivotable air jet spinning nozzle which can be released from the bottom roller carrier is implemented by the bottom roller carrier including a bearing element having a free end, for receiving the air jet spinning nozzle, wherein the bearing element forms a pivot axis for pivoting the air jet spinning nozzle between an operating position and a second position, wherein the bearing element is connected to a portion spaced apart from the free end on the bottom roller carrier.

Claims

1. A drafting system unit for a spinning unit of an air jet spinning machine for producing a thread or roving from a supplied fiber strip, with at least one front roller pair consisting of a front top roller on a load carrier and a driven front bottom roller on a bottom roller carrier and forming a clamping line, and a bearing element arranged on the bottom roller carrier for movably bearing an air jet spinning nozzle having a nozzle carrier, characterized in that the bottom roller carrier comprises a guide element and the bearing element, wherein the guide element has a guide surface, wherein the bearing element has at least one free end, via which the air jet spinning nozzle can be received, wherein the bearing element forms a pivot axis for pivoting the air jet spinning nozzle between an operating position and at least one second position spaced apart therefrom, wherein the bearing element is connected to a portion spaced apart from the at least one free end on the bottom roller carrier, wherein the guide element is arranged on the bottom roller carrier and having the guide surface extending parallel beyond the at least one free end and at a distance from the bearing element, and wherein the air jet spinning nozzle is brought into contact with the guide surface by the nozzle carrier and, as the nozzle carrier is disposed against the guide surface, the air jet spinning nozzle is pushed via the at least one free end of the bearing element until the nozzle carrier rests against a portion of the bearing element.

2. The drafting system unit according to claim 1, characterized in that the at least one second position is a maintenance position or a position different therefrom.

3. The drafting system unit according to claim 1, characterized in that the bearing element has a stop element in a portion opposite the at least one free end.

4. The drafting system unit according to claim 1, characterized in that the bearing element is designed in the region of the at least one free end for receiving a position securing element.

5. The drafting system unit according to claim 1, characterized in that the bearing element is arranged on a pivot axis carrier of the bottom roller carrier.

6. The drafting system unit according to claim 5, characterized in that the bearing element is formed by a bearing pin held stationary by the pivot axis carrier, wherein the bearing pin is pressed or screwed into the pivot axis carrier.

7. The drafting system unit according to claim 1, characterized in that the bearing element is arranged in such a manner that the air jet spinning nozzle can be pivoted along a direction of movement extending transversely to the axis of rotation of the front roller, to extend orthogonally between the operating position and the at least one second position.

8. An air jet spinning machine for producing the thread or roving from the supplied fiber strip, characterized by the spinning unit having the drafting system unit according to claim 1.

Description

(1) Exemplary embodiments of the invention are explained below with reference to the drawings, wherein identical reference signs are used for identical functional elements. In the drawings:

(2) FIG. 1 is a schematic representation of a perspective view of a partial region of a drafting system unit with an air jet spinning nozzle being separated from a bearing element;

(3) FIG. 2 is a schematic representation of a perspective view of a partial region of the drafting system unit of FIG. 1 with the air jet spinning nozzle pushed onto the bearing element in a maintenance position;

(4) FIG. 3 is a schematic representation of a perspective view of a partial region of the drafting system unit of FIG. 1 with the air jet spinning nozzle being arranged in an operating position,

(5) FIG. 4 is a schematic representation of a perspective view of a partial region of the drafting system unit of FIG. 1, and

(6) FIG. 5 is a schematic representation of a perspective view of a partial region of a drafting system unit with the air jet spinning nozzle being arranged in an operating position according to a further embodiment.

(7) A perspective section of a drafting system unit 1 shown in a schematic representation in FIG. 1 shows the connection region of an air jet spinning nozzle 2 in the region of a front bottom roller 3 on a bottom roller carrier 4 according to one embodiment. In FIG. 1, the air jet spinning nozzle is separated from the bottom roller carrier 4.

(8) For arrangement on the bottom roller carrier 4, the air jet spinning nozzle 2 has a carrier 13 with a bearing element receptacle 14 extending through the carrier 13. For the arrangement of the air jet spinning nozzle 2 on the bottom roller carrier 4, the bearing element receptacle 14 is pushed onto a bearing element 5 designed as a bearing pin in the direction of a bearing element carrier 10 carrying the bearing pin until it reaches the pushed-on position on the bearing pin 5 shown in FIG. 2.

(9) In the maintenance position of the air jet spinning nozzle 2 shown in FIG. 2, which according to an exemplary embodiment constitutes a second position, the latter is pushed completely onto the bearing pin via a free end 6 of the bearing pin, wherein an end face of the carrier 13 facing the bearing element carrier 10 rests against a circumferential stop element 7 of the bearing pin. To secure the pushed-on position of the air jet spinning nozzle 2 on the bearing pin, a snap ring 9 is used, which is inserted in the region of the free end 6 of the bearing pin into a groove 8 extending around the bearing pin.

(10) To simplify the arrangement of the air jet spinning nozzle 2 on the bottom roller carrier 4, a guide element 11 is arranged on the bottom roller carrier 4, the guide surface 12 of which extends parallel to the bearing pin beyond its free end 6. In order to assemble the air jet spinning nozzle 2, in the position shown in FIG. 1, it is brought into contact with the guide surface 12 by the carrier 13 and, resting against the guide surface, is pushed via the free end 6 of the bearing pin onto the latter, until the carrier 13 rests with its end face facing the bearing element carrier 10 against the stop element 7 of the bearing pin (cf. FIG. 4).

(11) From the maintenance position shown in FIG. 2, the air jet spinning nozzle 2 can be pivoted about the bearing pin or about the pivot axis formed by the bearing pin up to the operating position shown in FIG. 3 and back again, wherein the air jet spinning nozzle 2 in the operating position in the fiber strip transport direction is arranged downstream of the clamping line formed by the front bottom roller 3 and the front top roller, here not shown, for receiving the supplied fiber strip.

(12) FIG. 5 shows a further exemplary embodiment, wherein, in contrast to the previous exemplary embodiment, the pushing-on direction of the air jet spinning nozzle 2 is reversed. The stop element 7 of the bearing pin is arranged along the pushing-on direction at the right end of the bearing pin, whereby the air jet spinning nozzle 2 can be pushed on from the left via the on the left arranged free end 6 of the bearing pin. The guide element 11 is arranged at a corresponding position on the bottom roller carrier 4. In the pushed-on state of the air jet spinning nozzle 2, the carrier 13 of the air jet spinning nozzle 2 has an end portion 15 pushed onto the bearing pin on the side facing the free end 6 of the bearing pin, said end portion having a bore for receiving a pressure piece 16, in particular a spring-loaded pressure piece. According to this exemplary embodiment, the pressure piece 16 is screwed into the bore 15 and engages with its tip in a recess formed on the bearing pin congruently to the tip of the pressure piece 16 and not shown, wherein the recess according to an exemplary embodiment is formed as a circumferential groove 8 on the bearing pin. As a result, the air jet pinning nozzle 2 can be fixed in a positionally secure manner on the bearing pin. To disassemble the air jet spinning nozzle 2, the pressure piece 16 is to be released in a defined manner in the unscrewing direction, as a result of which the air jet spinning nozzle 2 becomes freely movable along the pushing-on direction. The use of such a pressure piece 16, in particular a spring-loaded pressure piece, simplifies the assembly and disassembly of the air jet spinning nozzle 2 on or from the bearing pin.

LIST OF REFERENCE SIGNS

(13) 1 drafting system unit 2 air jet spinning nozzle 3 front bottom roller 4 bottom roller carrier 5 bearing element 6 free end 7 stop element 8 groove 9 snap ring 10 bearing element carrier 11 guide element 12 guide surface 13 carrier 14 bearing element receptacle 15 end portion of the carrier 16 pressure piece