Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1996-11-04
1998-04-14
Mansen, Michael
Winding, tensioning, or guiding
Coil holder or support
Spool or core
139452, 242364, B65H 5100, D03D 4736
Patent
active
057382913
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to a yarn braking device having a Cardan holding device supporting a braking element which biases the braking element in contact with a storage drum by a biasing force and defines first and second Cardan axes.
DESCRIPTION OF THE RELATED ART
In a yarn braking device which is known because it has been used in practice (IT-MI 93A001313 having a prior time rank), the braking element is an annular rubber membrane having fixed thereto a frustoconical metal surface as a braking surface and including at least one circumferential corrugation in the wall of the membrane. Two diametrically arranged pins engage the annular carrier from outside, said pins being arranged in end areas of a supporting fork and defining the second Cardan axis. The base member of the fork is adapted to be rotated about the first Cardan axis in a stationary slide. The biasing force with which the braking surface abuts on the draw-off area of the yarn storage drum is adjusted by axially displacing the slide. The braking element is capable of carrying out balancing movements in the Cardan holding device. As a result of these balancing movements, a self-centering effect of the braking surface and a self-adjusting effect of said braking surface with regard to a circumferentially uniform contact force are achieved.
A similar Cardan holding device for a lamellar braking element is known from EP-O 049 897 A1. The lamellar braking element is held in a cage-like annular carrier on the outer side of which two pins are arranged which define the second Cardan axis, The pins are supported in prongs of a forkshaped body, which is adapted to be tilted about the first Cardan axis in a stationary slide.
In both known solutions, the Cardan holding device comprises a comparatively large amount of components and this makes it more difficult to mount and dismount the braking element. This difficulty is also due to the fact that the braking element is so to speak an integrated part of the Cardan holding device. In addition the Cardan axes extend at a large axial distance from one another, and this may impede smooth adjustment or centering of the braking surface.
It is the object of the present invention to provide a yarn braking device of the type mentioned herein, which is provided with a structurally very simple and compact Cardan holding device that is easy to mount, and a yarn storage and feed device. In accordance with a further aspect of the present invention, better centering of the braking element is to be achieved and the adaptive adjustment of said braking element is to be facilitated.
SUMMARY OF THE INVENTION
The Cardan holding device of the invention can be produced easily and at a moderate price. The braking element is easy to mount because it is only loosely received in the Cardan holding device and because it is only the biasing force that couples said braking element functionally to the Cardan holding device in the second Cardan axis. The annular carrier and the support ring can easily be installed in the Cardan holding device one after the other. The second Cardan axis is so to speak first imaginary and it is only the cooperation between the support ring and the annular carrier under the influence of the biasing force by means of which said second Cardan axis is structurally realized. The braking element can be replaced by a different type of braking element including an appropriate annular carrier at any time. Under certain circumstances, the braking element needs no structural preparation for a cooperation with the Cardan holding device at all, since said Cardan holding device itself has all the preconditions required for the Cardan function. By means of the loose arrangement of the annular carrier, an additional advantage is achieved since the annular carrier is provided with an additional degree of freedom in relation to the Cardan axes because the annular carrier can moved at least to a limited extent, relative to the two Cardan axes in the radial direction. The braking element choos
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patent: 5310127 (1994-05-01), Deiuri
patent: 5316051 (1994-05-01), Zenoni et al.
patent: 5546994 (1996-08-01), Sarfati
patent: 5553641 (1996-09-01), Zenoni
Iro AB
Mansen Michael
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