Textiles: spinning – twisting – and twining – Apparatus and processes – Open end spinning
Reexamination Certificate
1999-08-02
2001-06-05
Calvert, John J. (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Open end spinning
C057S352000, C057S404000, C057S406000, C057S412000, C057S413000, C057S414000, C057S417000
Reexamination Certificate
active
06240717
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an open-end spinning device having a vacuum-loaded rotor housing with a forward opening, a spinning rotor rotatable at high speed in the rotor housing and fiber conduit plate for closing the forward opening to the rotor housing, the fiber conduit plate having a replaceable conduit-plate adapter comprising the mouth area of a fiber guide conduit and comprising a yarn withdrawal jet, the conduit-plate adapter being detachably fixed in an appropriately designed receptacle of the fiber conduit plate.
BACKGROUND OF THE INVENTION
Open-end spinning devices of the above described type are known, e.g., from German Patent Publication DE 196 17 527 A1. In this spinning device, a pivotably mounted cover element has an annular groove for receiving a lip sealing element and is also formed with a receptacle with conical contact surfaces opening in the direction of the rotor housing in which a correspondingly conical conduit plate adapter is detachably fixed. The precise angular fitting position of the conduit plate adapter is achieved by a positioning device consisting of a centering pin and an arced groove. The maintenance of the prescribed angular position of the conduit plate adapter in the fiber conduit plate can be monitored via a monitoring device. In the assembled state the conduit plate adapter, aligned in a precise angular manner by the centering pin, rests by its conical contact surface on the correspondingly formed conical contact surface of the receptacle and is loaded thereby with a holding force acting in axial direction via jointly acting, positive fastening means and frictionally connected or frictionally engaged means.
In this known device, the described type of fastening is disadvantageous. In order to replace the conduit plate adapter, in addition to disengaging the frictionally connected means, e.g., a magnetic coupling, the positive fastening means, e.g., designed as a threaded connection or bayonet catch and cooperating with the magnetic coupling, must always be disengaged, using a special tool if necessary.
SUMMARY OF THE INVENTION
In view the state of the art described above, it is an objective of the present invention to provide a simplified and therewith improved fastening means for conduit plate adapters.
The present invention achieves this objective by providing an exclusively non-positive, i.e., frictionally connected, means of fastening of the conduit plate adapter detachably to the fiber conduit plate in an open-end spinning device. More specifically, the present invention is adapted to an open-end spinning device basically comprising a rotor housing defining a forward opening, a spinning rotor rotatable in the rotor housing, and a fiber conduit plate for closing the forward opening of the rotor housing, and particularly an open-end spinning device wherein the fiber conduit plate defines a receptacle for detachably receiving a replaceable conduit plate adapter which, e.g., may comprise a mouth area of a fiber guide conduit and comprises a yarn withdrawal jet. According to the present invention, a magnetic coupling is provided for exclusively frictionally connected fastening of the conduit plate adapter detachably to the fiber conduit plate.
Such a design in accordance with the present invention results in a simple fixing of the conduit plate adapter which can be easily and rapidly released for detachment and replacement of the conduit plate adapter, yet is very reliable and exact during operation and assembly.
In a preferred embodiment, the magnetic coupling comprises at least one permanent magnet fixed to or fitted into either the fiber conduit plate or the conduit plate adapter and a preferably disk-shaped ferromagnetic structural component arranged on the other thereof for cooperating therewith for a frictionally connected magnetic connection therebetween, preferably acting in the direction axially with respect to the fiber conduit plate and the conduit plate adapter. Preferably, two symmetrically arranged, disk-shaped permanent magnets or, advantageously, also a centrally arranged ring magnet, are permanently anchored in the fiber conduit plate or in a structural element connected to the fiber conduit plate. The associated ferromagnetic structural components, e.g., a steel ring or two appropriately symmetrically arranged steel disks are preferably positioned in such a manner in the conduit plate adapter that the permanent magnets and the ferromagnetic structural components face opposite each other in the assembled state while maintaining a slight air gap therebetween. This air gap assures a precise axial fitting position of the conduit plate adapter since it is thereby assured that the conduit plate adapter always is supported in the area of its conical contact surface.
In a further advantageous development of the invention, a positioning device arranged between the fiber conduit plate and the conduit plate adapter assures a necessary, precise angular fitting position of the conduit plate adapter. The use of an ejector for the conduit plate adapter is also advantageous.
In addition to an economical manufacture, the subject matter of the invention combines in an advantageous manner a simple and easy manipulation with high operational safety and a reliable and exact fixing of the conduit plate adapter in the receptacle of the fiber conduit plate. The design of a purely frictionally connected, detachable fastening means in accordance with the invention overcomes the prevailing conventional wisdom that a purely frictionally connected fastening of the conduit plate adapter in this type of open-end spinning application does not offer sufficient operational safety, which conventional wisdom has accordingly resulted in the known combination of frictionally connected and positive fastenings.
Further details, features and advantages of the present invention will be understood from the following description of exemplary embodiments with reference to the accompanying drawings.
REFERENCES:
patent: 4471608 (1984-09-01), Kawabata et al.
patent: 5321943 (1994-06-01), Schmid
patent: 5638671 (1997-06-01), Stahlecker et al.
patent: 5768881 (1998-06-01), Lauschke
patent: 5778654 (1998-07-01), Stahlecker
patent: 5794430 (1998-08-01), Grecksch et al.
patent: 6035623 (2000-03-01), Wassenhoven et al.
patent: 2 038 689 (1973-01-01), None
patent: 196 17 527 A1 (1996-05-01), None
patent: 198 36 073 (1998-08-01), None
Calvert John J.
Hurley Than R
Kennedy Covington Lobdell & Hickman LLP
W. Schlafhorst AG & Co.
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