Spinning rotor for an open-end-spinning device operating at high rotor speeds

Abstract

A spinning rotor (3) for an open-end spinning device (1) operating in particular at high rotor speeds with a rotor cup (26), having a rotor bottom (6) and an opening (30) and having an annular wall section (31) designed as a fiber sliding wall. The rotor cup (26) in the transitional area between the rotor bottom (6) and the annular wall section (31) has a support collar (9) pointing away from the opening (30) of the rotor cup (26).

Claims

1. Spinning rotor (3) for an open-end-spinning device (1) operating in particular at high rotor speeds, comprising a rotor cup (26), which comprises a rotor bottom (6) and an opening (30) and has an annular wall section (31) designed as a fiber sliding wall, characterized in that the rotor cup (26) in the transitional area between the rotor bottom (6) and the annular wall section (31) has a support collar (9) pointing away from the opening (30) of the rotor cup (26), characterized in that the support collar (9) has a depth (T.sub.SK) which is less than a third of the length (L) of the wall section (31) of the rotor cup (26).

2. Spinning rotor according to claim 1, characterized in that the depth (T.sub.SK) of the support collar (9) is between 2 and 5 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail in the following with reference to an example embodiment shown in the drawings, wherein:

(2) FIG. 1 shows schematically in side view an open-end spinning device with a single-motor driven, magnetically mounted spinning rotor,

(3) FIG. 2 shows a perspective view of a single-motor driven spinning rotor with a two-part rotor shaft, wherein on the front part of the rotor shaft a rotor cup designed according to the invention is secured,

(4) FIG. 3 shows in side view and in cross-section a rotor cup designed according to the invention with the associated front rotor shaft part.

DETAILED DESCRIPTION OF THE INVENTION

(5) FIG. 1 shows an open-end spinning device 1 with a magnetically mounted and single-motor driven spinning rotor 3.

(6) Such open-end spinning devices 1 are already known and described in relative detail for example in European Patent Publication EP 0 972 868 A2.

(7) Such open-end-spinning devices 1 have respectively a rotor housing 2, in which the rotor cup 26 of a spinning rotor 3 rotates at high speed.

(8) The spinning rotor 3 is here preferably driven by an electromotor single drive 18 and is supported with its rotor shaft 4 in front 27 and rear 28 bearing points of a magnetic bearing arrangement 5, which position the spinning rotor 3 in both radial and axial direction.

(9) The rotor housing 2 which is open towards the front is closed during the spinning operation by a pivotably mounted cover element 8 and connected by a suitable pneumatic line 10 to a source of negative pressure 11, which produces the negative spinning pressure required in the rotor housing 2.

(10) In the cover element 8, as already known, a so-called channel plate adapter 12 is formed which comprises the yarn take-off nozzle 13 and the mouth area of the fiber guiding channel 14. A yarn take-off tube 15 is connected as usual to the yarn take-off nozzle 13.

(11) On the cover element 8, which is mounted rotatably in a limited manner about a pivot axis 16, also an opening roller housing 17 is secured. Furthermore, the cover element 8 comprises rear bearing consoles 19, 20 for supporting an opening roller 21 or a sliver draw-in cylinder 22.

(12) The opening roller 21 is driven in the region of its whorl 23 by a rotating, machine-length tangential belt 24, whereas the (not shown) drive of the sliver draw-in cylinder 22 is preferable performed by a worm gear arrangement, which is connected to a machine-length drive shaft 25.

(13) In an alternative embodiment the opening roller 21 and/or the sliver draw-in cylinder 22 can of course, also be driven by a single, for example a stepping motor.

(14) As already indicated above and shown in FIG. 2 on a larger scale, the spinning rotor 3 of the open-end spinning device 1 is driven by an electric motor driven single drive 18, the rotor-side component of which is denoted by the reference numeral 33.

(15) In order to easily disassemble such spinning rotors 3 if necessary, in particular the rotor cups 26 which are subjected to increased wear, it is known to design the rotor shaft 4 of such spinning rotors in two parts.

(16) This means that the rotor shaft 4 comprises, as shown in the example embodiment, a rear rotor shaft part 4A equipped with the rotor-side magnet bearing components of the front and the rear bearing point 27, 28 and a front rotor shaft part 4B to which the rotor cup 26 is secured.

(17) As explained in detail for example in German Patent Publication DE 100 24 020 A1, the rotor shaft part 4B, to which the rotor cup 26 of the spinning rotor 3 is secured, is connected to the rotor shaft part 4A by an anti-rotational plug-in connection, if necessary detachably.

(18) This means the rotor cup 26 of the spinning rotor 3, which is connected unreleasably to the front rotor shaft section 4A, as shown in FIG. 2, is connected by a coupling device denoted overall by the reference numeral 29 to the rear rotor shaft section 4B.

(19) The coupling device 29 consists for example of a magnet device 32 for axially fixing the components 4A, 4B and a mechanical anti-rotation device 35, 36.

(20) The rotor cup 26 designed as a relatively thin-walled construction comprises in the region of its bottom 6 a connection collar 7 with a bore 41, in which, preferably by means of a press-fit, the front rotor shaft section 4A designed as a connection bolt is secured.

(21) The rotor shaft section 4A is preferably made at least in its end section from a ferromagnetic material and divided into two sections of equal length, preferably a cylindrical guiding section 38 and a section designed as an external polygon 36.

(22) As also shown in FIG. 2, furthermore in the tubular, rear rotor shaft section 4B, for example also by means of a press-fit, a receiving tube 34 is secured which has a rotationally secured internal polygon 35 and permanent magnet insert 32. The rotor shaft section 4B also has a cylindrical bore 37, which in the installed state corresponds with the guiding section 38 of the front rotor shaft section 4A.

(23) As shown in particular in FIG. 3, the rotor cup 26, as usual, has a front opening 30, a wall section 31 beginning at the opening 30, diverging to the rear and functioning as a fiber sliding wall and a rotor bottom 6 with a connection collar 7 formed thereon.

(24) The rotor cup 26 is designed overall as a relatively thin-walled component and in the region of the wall section 31 has an almost constant wall thickness, whereas in the region of the rotor bottom 6 the wall thickness increases from the outside in.

(25) As already explained above, on the rotor bottom 6 a connection collar 7 is formed in one piece which has a bore 41 for receiving the front rotor shaft section 4B. This means the front rotor shaft section 4B designed as a connection bolt is secured in the bore 41 of the connection collar 7, preferably by means of a press-fit.

(26) The rotor cup 26 also has in the connection area between the wall section 31 and the rotor bottom 6 a support collar 9 according to the invention pointing away from the opening of the rotor cup.

(27) Said support collar 9 is advantageously designed as a rotationally symmetrical ring and has an essentially triangular cross-sectional area (Q).

(28) As shown in particular in FIGS. 2 and 3, the support collar 9 is formed in one piece on the rear side 39 of the rotor bottom 6 of the rotor cup 26 and preferably has a depth (T.sub.SK), which is less than a third of the length (L) of the rotor cup 26. In practice the depth (T.sub.SK) of the support collar 9 is preferably between 2 and 5 mm.

(29) It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of a 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 embodiment, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.