Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1998-12-02
2000-05-16
Falik, Andy
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
25112904, D03D 4730
Patent
active
060622733
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to apparatus supplying compressed air to the main blowing nozzle of an airjet loom and connected by ON/OFF and/or adjustable valves to a source of compressed air.
2. Related Art
Such apparatus is known for instance from U.S. Pat. No. 5,086,812 and supplies highly compressed air to a main blowing nozzle and to the accessory main blowing nozzle during insertion of a filling yarn. Compressed air at a lower pressure is fed to the main blowing nozzle (and to the accessory main blowing nozzle) during the time interval between two filling insertions, said lower pressure being selected in such manner that the filling shall not drop out of the main blowing nozzle. The high-pressure compressed air is fed through a line containing a throttling valve and a check valve to the main blowing nozzle. The low-pressure compressed air is supplied through a line bypassing the check valve and the throttling valve and containing its own throttling valve.
SUMMARY OF THE INVENTION
The objective of the invention is to create apparatus of the above kind which shall keep at a low value the response time between opening the check valve and the actual application of high-pressure compressed air.
This problem is solved by providing an integrated or unitary air feed unit comprising an intake connected to the compressed-air supply and an outlet connected to the main blowing nozzle, said unit further containing ducts connecting intake and outlet and fitted with valves.
The heretofore conventional configuration of several connecting lines entail pressure drops that increase the response time especially during the opening of the check valve and during the actual application of high-pressure compressed air to the main blowing nozzle and such pressure drops can be eliminated by using an air feed unit. Moreover the elimination of a plurality of connecting lines offers greater compactness and particularly an inspectable configuration. This feature is especially advantageous in airjet looms comprising several main blowing nozzles for inserting different fillings.
In one embodiment of the invention, the air feed unit comprises a main duct connecting the intake to the outlet and fitted with a check valve and/or a throttle valve and further containing a bypass duct shunting the check valve and fitted with a throttle valve. This design offers high compactness because only one connection is needed between the air feed unit to the compressed-air source and to the main blowing nozzle, other connecting lines not being required.
In another embodiment of the invention, the valves comprise plungers which are displaceable inside boreholes of the air feed unit and include drives that are affixed to the air feed unit and include drives that are affixed to the air feed. The air feed unit together with the valves constitutes thereby a compact component assembled as such and if need be disassembled as such.
In yet another embodiment of the invention, the air feed unit is mounted on a manifold reservoir. This feature eliminates also a connecting line between the manifold reservoir and the air feed unit because the latter can be hooked up by its intake to an outlet aperture of the manifold reservoir.
In another embodiment of the invention, a pressure sensor preferably generating electrical signals is mounted after the valves. This pressure sensor may also be part of the component formed by the air feed unit and allows monitoring the operation and/or the settings of check valves and throttling valves.
In another embodiment of the invention, the air feed unit is fitted with an electrical connector to which electrical conductors leading to the valves and/or to the pressure sensor can be hooked up and which may receive one or more plug elements for conductors leading to a control unit. This configuration also offers simple and easily surveyed electrical connections between the particular valves and the control unit.
A further embodiment of the invention comprises several main blowing nozzle
REFERENCES:
patent: 4410016 (1983-10-01), Maners
patent: 4534387 (1985-08-01), Van Hest
patent: 4651785 (1987-03-01), Volland et al.
patent: 5086812 (1992-02-01), Van Bogaert et al.
Bamelis Jean-Marie
Peeters Jozef
Falik Andy
Picanol N.V.
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