Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1998-06-15
1999-11-30
Falik, Andy
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
1394354, 1373293, 137637, 13761405, 226 97, 239589, 28272, F16K 1120
Patent
active
059924721
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pneumatic valve device and a yarn feeding device having the valve device wherein valves are provided to control consumers such as yarn threading nozzles.
BACKGROUND OF THE RELATED ART
In a yarn feeding device which is known from WO 92/22693 (U.S. Pat. No. 5,094,275), a pneumatic valve device which consists either of a main switching valve with inhibiting valves arranged downstream thereof, or of a multi-position multi-way valve or of a rotary slide valve, serves to selectively actuate either only one yarn threading nozzle provided at the feed side or to actuate a plurality of yarn feeding nozzles with compressed air.
In a yarn feeding device which is known from the brochure "Galaxy", reference number 48-1025-201/9239, of the company IRO AB, SE, page 15, issued in 1992, a pneumatic valve device is installed in the motor housing which can selectively be operated by means of two valve openers that are formed as externally accessible push buttons, namely in such a manner that either only the threading nozzle at the feed side is pressurized (by pressing the push button arranged on the back side of the motor housing) or all of the threading nozzles are pressurized (by pressing the push button arranged at the side of the motor housing). In these yarn feeding devices, which have been on the market since 1992, the valve device comprises a metal block in which two valves that are selectively actuable by means of the valve openers are contained in a chamber which is connected to a source of pressure and from which flow channels lead to the yarn threading nozzle at the feed side and to the other yam threading nozzles. In addition, a transverse connection is provided between the flow channels in the housing, the transverse connection containing a check valve which automatically opens in the flow direction towards the threading nozzle at the feed side, and automatically shuts off in the opposite flow direction. The valve device with the valve openers is composed of many parts and is technically troublesome with respect to manufacture and mounting.
In a yarn feeding device which is known from U.S. Pat. No. 5,181,544, a block which is connected to the motor housing has provided therein a compressed-air distributor which leads to a plurality of threading nozzles and to a pneumatic piston-cylinder unit and has arranged upstream thereof a valve which can be actuated by means of a valve opener. However, it is only possible to pressurize all of the consumers at the same time.
Finally, EP-A-0 418 949 discloses a valve device comprising a block-shaped housing and two valves, with two push buttons being provided for selectively connecting one of two outlets or both outlets to the source of pressure. To connect both outlets to the source of pressure, both push buttons must be pressed.
It is the object of the present invention to provide a valve device of the above-mentioned type and a yarn feeding device comprising such a valve device, in the case of which it is possible to choose between an individual actuation and the multiple actuation of consumers in a simple manner with respect to production and also in a user-friendly way.
SUMMARY OF THE INVENTION
This object is achieved according to the invention wherein a drag coupling is provided between a first valve opener of a first valve and a second valve opener opens said first valve and said second valve.
The valve device is simple from a constructional point of view because it just contains the two valves and the separated flow channels, so that a transverse connection with an additional check valve is not necessary. The valve device is particularly user-friendly because only the first or the second valve opener must be actuated to control either the pressurization of the at least one consumer or to control the pressurization of all consumers. The drag coupling is simple with respect to manufacture and reliable in function.
With simple constructional efforts, the yarn feeding device offers high operating convenience
REFERENCES:
patent: 4951915 (1990-08-01), Piao
patent: 5094275 (1992-03-01), Shaw et al.
patent: 5111852 (1992-05-01), Verhulst
patent: 5181544 (1993-01-01), Deiuri
patent: 5191680 (1993-03-01), Kaneko et al.
patent: 5351724 (1994-10-01), Zenoi et al.
patent: 5462095 (1995-10-01), Okesaku
Falik Andy
Iro AB
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