Step bearing for the shaft of a spinning rotor

Details Step bearing for the shaft of a spinning rotor Step bearing for the shaft of a spinning rotor

1991-01-02

1993-05-11

Hail, III, Joseph J.

Textiles: spinning, twisting, and twining

Apparatus and processes

Open end spinning

384603, 384610, 384611, D01H 412

Patent

active

052090558

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The instant invention relates of an open-end spinning device and more particularly to an axial bearing for a shaft of the spinning rotor.
Open-end spinning devices with a step bearing are known from U.S. Pat. No. 3,951,479 and U.S. Pat. No. 4,106,192. In open-end spinning devices in which the shaft of the spinning rotor bears on a rotatable ball it must be ensured that the oscillations of the machine are transmitted to the ball so that the latter is prompted to rotate in tune. U.S. Pat. No. 3,951,479 shows a step bearing in FIG. 4 in which oscillations are transmitted via the oscillation support 44 in the axial sense of the spinning rotor to the ball.
In U.S. Pat. No. 4,106,192 the seating of the ball is effected by a bolt which is divided by slits into oscillator tuning-fork-like oscillators in order to transmit the oscillations of the machine to the ball.
In the operation of an open-end spinning rotor sudden axial oscillations of the shaft occur and result in a high degree of wear of the contact surfaces of shaft and ball in the conventional step bearings. Furthermore the spinning rotor can impact against the wall of its rotor housing and damage it.
It has been attempted to attenuate the oscillations of the shaft by means of springs. This bearing has the disadvantage that the shaft cannot be positioned precisely in axial direction and this leads to an unsteady operation. It does not ensure that the ball rotates in tune, so that stoppage of the ball occurs. When tuning-fork-like oscillators are used, axial damping of the rotor shaft is not possible. This leads to damage of the spinning device. The open-end spinning devices according to the state of the art cannot favorably influence the axial oscillating movements and shocks which occur during the operation of spinning rotors. The shown elastic supports of the ball are not suited for this. The elastic bearings lead to a stoppage of the ball and thereby to bearing damage.


SUMMARY OF THE INVENTION

It is the object of the instant invention to design an open-end spinning device wherein a ball forming part of an axial bearing is axially damped with respect to the shaft.
Thanks to the intercalation of a damping element between the ball and its bearing support against the machine the axial oscillation of the rotor shaft are damped so that knocks against the thrust bearing and thereby wearing of the step bearing end of the shaft end are eliminated. By damping axial knocks the risk of the rotor impacting against the walls of the rotor housing is furthermore avoided. A simple placement of a damping element between the ball and its bearing point on the machine would result in attenuating the oscillations of the machine to such an extent that a rotation of the ball in tune with the shaft would not take place. Intermittent or continuous stoppage of the ball and resulting damage to the shaft and ball would occur. The embodiment of the step bearing according to the instant invention attenuates shocks and oscillations in the axial direction of the shaft and nevertheless ensures in-tune rotation of the ball as well as precise axial positioning of the spinning rotor. Due to the fact that the ball is in contact in radial direction with the bearing point on the machine in such manner that the oscillations of the machine in radial direction of the shaft are transmitted to the ball, for instance via the cap, it is ensured that the latter is certain to rotate in tune with the shaft. These oscillations suffice to stimulate the ball. Good axial damping of the shaft and at the same time stimulation of the ball are achieved. The shock-like oscillations of the shaft can be attenuated by means of the step bearing according to the instant invention. Impact of the spinning rotor against the cover of the rotor and damage to the step bearing are thereby avoided. A precise axial positioning of the spinning rotor is possible.
The position of the ball in a cap makes it easy for the machine oscillations which cause the ball to rotate to be transmitted to it. T

REFERENCES:
patent: 931069 (1909-08-01), Larrabee
patent: 2269606 (1942-01-01), Spear
patent: 3311433 (1967-03-01), Graham et al.
patent: 3861132 (1975-01-01), Stahlecker et al.
patent: 3875732 (1975-04-01), Ellingham
patent: 4022008 (1977-05-01), Pimiskern et al.
patent: 4186548 (1980-02-01), Stahlecker
patent: 4221439 (1980-09-01), van Ditshuizen
patent: 4516396 (1985-05-01), Stahlecker et al.

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