Open-end spinning device

Abstract

An open-end spinning device having a rotor housing (1) which can be acted upon by negative pressure and a spinning rotor (2), the rotor housing (1) is open towards the front and can be closed by a cover element, to the rear the rotor housing (1) has a rear wall (3) with a passage opening (4) for a rotor shaft (5) of the spinning rotor (2). In order to prevent the occurrence of thread coils inside the rotor housing (1) behind the spinning rotor, a narrow gap (6) of less than 2 mm is provided between the spinning rotor (2) and the rear wall (3) of the rotor housing (1) at the largest outer diameter of the spinning rotor (2) and the rear wall (3) of the rotor housing (1) is designed such that the area (7) behind the spinning rotor (2) is covered inside the rotor housing (1).

Claims

1. An open-end spinning device comprising a rotor housing which can be acted upon by negative pressure and a spinning rotor, the rotor housing is open towards the front and can be closed by a cover element, to the rear the rotor housing has a rear wall with a passage opening for a rotor shaft of the spinning rotor, characterised in that at the largest outer diameter of the spinning rotor there is a narrow gap of less than 2 mm gap width between the spinning rotor and the rear wall of the rotor housing, and the rear wall of the rotor housing is designed in such a manner that the area behind the spinning rotor is covered inside the rotor housing, and the rear wall of the rotor housing is at least partially formed by an exchangeable attachment which rests on a boundary wall of the rotor housing and the attachment extends to lateral boundary walls of the rotor housing.

2. The open-end spinning device according to claim 1, characterised in that at the largest outer diameter of the spinning rotor there is a narrow gap of less than 2 mm gap width but greater than 0.2 mm gap width between the spinning rotor and the rear wall of the rotor housing.

3. The open-end spinning device according to claim 1, characterised in that the spinning rotor has a rotor bottom facing the rear wall of the rotor housing and the narrow gap continues at least partially along the rotor bottom.

4. The open-end spinning device according to claim 1, characterised in that the spinning rotor has an outer edge on the largest outer diameter and the narrow gap continues axially along the outer edge.

5. The open-end spinning device according to claim 1, characterised in that the attachment forms the narrow gap with the spinning rotor at the largest outer diameter of the spinning rotor.

6. The open-end spinning device according to claim 1, characterised in that the attachment is designed to be conical or cylindrical.

7. The open-end spinning device according to claim 1, characterised in that the attachment is fastened to a boundary wall of the rotor housing by a clip connection, a screw connection, a magnetic force or a press fit.

8. The open-end spinning device according to claim 1, characterized in that the narrow gap possesses a gap width of approximately 1 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in greater detail below on the basis of embodiment examples shown in the drawings.

(2) FIG. 1 shows an open-end spinning device according to the present invention with an exchangeable attachment;

(3) FIG. 2 shows an open-end spinning device according to the present invention with an alternative exchangeable attachment;

(4) FIG. 3 shows an open-end spinning device according to the present invention without an attachment;

(5) FIG. 4 shows an alternative open-end spinning device according to the present invention without attachment;

(6) FIG. 5 shows an open-end spinning device according to the present invention with an alternative spinning rotor.

(7) The figures show open-end spinning devices according to the present invention. Since open-end spinning devices have already been disclosed in principle, the representation of the figures is limited to the essential elements of the invention. In the figures, elements with similar functions have the same reference numbers, even if the elements are designed differently.

DETAILED DESCRIPTION OF THE INVENTION

(8) FIG. 1 shows a first embodiment of an open-end spinning device according to the invention. This comprises a rotor housing 1 open to the front and a spinning rotor 2 arranged inside. In spinning operation, the rotor housing 1 is closed by a cover element that is not shown and is pressurized by a vacuum supply that is not shown. Away from the open side, i.e. towards the back, the rotor housing 1 has a passage opening 4 for a rotor shaft 5 of the spinning rotor 2. The rotor shaft 5 and thus the spinning rotor 2 are driven outside the rotor housing 1.

(9) The rotationally symmetrical spinning rotor 2 comprises a rotor shaft 5 and a spinning cup 13. The spinning cup 13 comprises a rotor bottom 9 and a ring-shaped wall section 14. The ring-shaped wall section 14 is cone-shaped towards the open end. The largest outer diameter of the spinning rotor 2 is thus located at the transition area between the rotor bottom 9 and the ring-shaped wall section 14. The spinning rotor 2 shown has an outer edge of 8 at its largest outer diameter.

(10) The embodiment of FIG. 1 has an attachment 10. The attachment 10 is mounted on the rear boundary wall 11 of the rotor housing 1. The rear wall 3 of the rotor housing 1 is thus partly formed by the attachment 10. The rear wall 3 of the rotor housing 1, in the shown embodiment example of attachment 10, covers the area 7 behind the spinning rotor 2. At the largest outer diameter of the spinning rotor 2, the attachment 10 and the spinning rotor form a narrow gap 6 with a gap width of less than 2 mm. The gap width results from the smallest distance of the largest outer diameter of the spinning rotor 2 from the rear wall 3 of the rotor housing 1. In the embodiment example, the gap 6 continues along the rotor bottom 9. The gap 6 also continues axially along the outer edge 8.

(11) The rear wall 3 of the rotor housing 1 shields the area 7 behind the spinning rotor 2 inside the rotor housing 1. The rear wall 3 is designed in such a way that there is no opening along an imaginary jacket surface around the axis of rotation of the spinning rotor 2 due to the largest outer diameter of the spinning rotor, with the exception of the narrow gap between the spinning rotor 2 and the rear wall 3.

(12) In the embodiment example shown in FIG. 1, the attachment 10 is conical. The diameter of the rotationally symmetrical attachment 10 increases from the spinning rotor 2 to the rear boundary wall 11. Attachment 10 can also be cylindrical.

(13) The open-end spinning device of FIG. 2 essentially corresponds to the open-end spinning device of FIG. 1. The only difference between the two spinning devices is the embodiment of attachment 10. The attachment 10 of FIG. 2 extends to the lateral boundary walls 12 of the rotor housing 1.

(14) The embodiment shown in FIG. 3 does not have an exchangeable attachment 10. The rotor housing is constructed in one piece. The rear wall 3 of the rotor housing 1 thus corresponds to rear boundary wall 11. Otherwise the shape and construction of the open-end spinning device corresponds to FIG. 2.

(15) FIG. 4 shows a variant without attachment 10. In contrast to the embodiment examples shown previously, the gap 6 at the largest outer diameter of the spinning rotor 3 does not continue along the outer edge 8 of the spinning rotor. However, the rear wall 3 of the rotor housing 1 and the rotor bottom 9 are designed so that the gap 6 continues along the rotor bottom. This embodiment makes it possible to insert 10 spinning rotors 2 with different diameters into the rotor housing 1 even without an exchangeable attachment. The spinning rotors 2 only need to have the same angle of inclination at the rotor bottom 9.

(16) FIG. 5 shows a variant of an open-end spinning device configured according to the present invention, with another spinning rotor 2. In terms of invention, a narrow gap 6 of less than 2 mm gap width between the spinning rotor 2 and the rear wall 3 of the rotor housing 1 is also provided on the largest outer diameter of the spinning rotor 2. As with previous embodiments, the gap 6 also continues along the rotor bottom 9. However, the gap width at the rotor bottom 9 is larger than at the largest outer diameter of the spinning rotor 2. Here again, it is clear that, in the present invention, it is important that the area behind the spinning rotor is shielded or covered. It does not matter that the area behind the spinning rotor 2 is filled by the rotor housing 1.

LIST OF REFERENCE NUMBERS

(17) 1 Rotor housing 2 Spinning rotor 3 Rear wall of the rotor housing 4 Passage opening 5 Rotor shaft 6 Gap 7 Area behind the spinning rotor 8 Outer edge of the spinning rotor 9 Rotor bottom 10 Attachment 11 Rear boundary wall 12 Lateral boundary wall 13 Spinning cup 14 Ring-shaped wall section

(18) It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements.