Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1998-08-03
2000-05-09
Falik, Andy
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
2423654, B65H 5122, D03D 4734
Patent
active
060589825
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a yam feeding device having a brake element on an end of a storage drum wherein the brake element is openable for threading.
BACKGROUND OF THE INVENTION
In a yam feeding device which is known from WO 91/14032, a brake disc which defines the counter-brake surface of an output brake on the storage drum is tilted by means of a tilting element relative to the brake element, which abuts thereon with the brake surface, so as to open a wedge-shaped gap for threading a yam. The tilting element which is stored in the storage drum is operated by a piston rod of a piston which is displaceable in the pressure chamber of a mounting. The pressure chamber is connectable to a source of pressure by which a threading nozzle arranged in the output brake is also supplied. Apart from the great constructional efforts required for the brake opening device, it is difficult under adverse conditions to thread the yam properly into and through the output brake.
In a yam feeding device which is known from EP 0 567 045 A1, a piston rod which is extensible by means of a piston is provided outside of and next to the surface of the storage drum, with the piston rod directly acting on a brake surface-defining brake band of the brake element or on the brake element, and lifting the brake band in a locally defined area from the counter-brake surface on the storage drum to open a crescent-shaped threading gap for the yam. Apart from the constructional efforts and the problem of accommodating such an apparatus in view of the normally very limited space, the mechanical load on the brake element and the brake surface is great.
U.S. Pat. No. 5 778 943 (Tholander) discloses a remotely controlled output brake of a yarn feeder, namely an output brake, the brake element of which can be switched between on/off breaking conditions. In the on condition, the brake element is pressed axially against a counter-surface of the feeder storage body with a contact force set by the axial position of the sleigh positioning the entire brake arrangement at the front end region of the storage body. In the off position, said brake element contacts the counter-surface with almost no axial contact pressure or even is slightly detached therefrom. The actuation mechanism, e.g. a pneumatic drive, is integrated into the carrier structure of the brake arrangement. Said actuating mechanism engages in an outer holding ring of the brake element or via a push collar at a deformable portion of said brake element.
However, said actuation mechanism is not intended to provide a threading position of the brake element with sufficient axial distance between the brake element and the counter-surface to thread in a new yarn. Threading requires that the entire brake arrangement be displaced via its sleigh along the adjustment screw. Said procedure is time-consuming and cumbersome and nullifies the set contact pressure adjustment.
It is the object of the present invention to provide a yarn feeding device of the above-mentioned type and a method of opening an output brake which enable a yam of any desired yam quality to be threaded into and through the output brake rapidly and without any problems and at any time.
According to the invention, a brake opening device is provided for opening the brake with a sufficient stroke to allow the threading of a new yarn. Said brake opening device has an axially movable boundary wall which is pneumatically loadable in order to move with the pneumatic pressure in an axial direction. Said boundary wall is connected in motion transmitting fashion to said brake element in order to move said brake element with its brake surface into an axial position where said brake surface is sufficiently lifted from said counter brake surface to allow a new yarn to be passed therebetween.
In the embodiment wherein the boundary wall is pressurized by an elevated pressure or a vacuum to move the brake element to a threading position, the threading-in position can rapidly be established under small constructional
REFERENCES:
patent: 5123455 (1992-06-01), Maina
patent: 5343899 (1994-09-01), Jacobsson et al.
patent: 5351724 (1994-10-01), Zenoni et al.
patent: 5441087 (1995-08-01), Alberyd et al.
patent: 5546994 (1996-08-01), Sarfati
patent: 5778943 (1998-07-01), Tholander
Falik Andy
Iro AB
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