Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-03
1993-11-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
26 515, 26 70, G01N 2186
Patent
active
052626539
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a National Phase of PCT/DE 90/00430 filed 2 June 1990 and based, in turn, upon German national application G 89 07 659.1 filed 22 June 1989 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a device for the lateral scanning of napless areas on fabric webs, particularly terry cloth, in a textile machine.
BACKGROUND OF THE INVENTION
In the processing especially of terry cloth in automatic sewing installations, such as crosscutting machines, there are numerous ways of scanning the napless zones along which the cross cutting is to be affected. The known solutions work with vertically adjustable bars (e.g. German Patent 30 24 389) or with alignment beams (e.g. German open application 36 24 994), which in addition also prepare the napless stretch so that the cross-cutting takes place between the weft yarns.
Also, the lateral napless edges along a fabric web have also been scanned by means of mechanical sensors. Thereby difficulties have arisen, particularly in fast-running webs, leading to disturbances.
However, a device which can be used in textile machines for the lateral scanning of napless areas, such as particularly found in terry cloth, which proves satisfactory in all applications has not been found prior to the invention.
OBJECTS OF THE INVENTION
It is an object of the invention to provide a device for the lateral scanning of napless areas in fabric webs, which operates automatically with high precision and reliability even at high web speeds and which has a relatively simple construction.
Another object is to provide a device for the purposes described which avoids drawbacks of the prior art units.
SUMMARY OF THE INVENTION
The device for the lateral scanning of napless areas on fabric webs, particularly terry cloth, in a textile machine, of the invention is characterized in that within the range of the scanning device the fabric web runs over a guide roller; and
the scanning of the napless zones of the fabric web is performed by means of photodetectors, consisting of transmitters and receivers, whereby the scanning beams are directed tangentially to the guide roller and thereby to the fabric web at its deflection point.
The transmitters and the receivers can be mounted on a frame, so that on one side the two transmitters are arranged and on a second side the receivers are arranged, whereby one transmitter with its receivers serve for scanning the nap edge of the napless area and the other transmitter with its receiver serve for scanning the edge of the napless area running across the fabric web.
Advantageously the frame is pivotable.
The first transmitter can emit a fan-shaped signal which is received either only by one of its receivers, by both of its receivers or by none of the receivers, depending on the position of the nap edge of the napless area along the fabric web.
The three possible signals can be evaluated in a control unit which actuates an adjusting element of the textile machine.
The second transmitter and the receiver in the area of the napless zone are in contact with each other and thereby interrupt the scanning of the nap edge.
The device of the invention operates as an optical nap scanner and is characterized by a very simple construction, whereby a high degree of reliability is achieved.
The installation operates virtually maintenance free and with relatively little expense. The signals obtained through the device are evaluated in the available machine control.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become more readily apparent from the following, reference being made to the accompanying drawing in which:
FIG. 1 is a side view transverse to the running direction of the fabric web illustrating a device according to the invention;
FIG. 2 view of the device according to FIG. 1 seen in the direction of arrow 14 of FIG. 1; and
FIG. 3 is a perspective view of a portion of the frame of the device.
SPECIFIC DESCRIPTION
FIGS. 1-3
REFERENCES:
patent: 2707815 (1955-05-01), Hadley
patent: 5043590 (1991-08-01), Strandberg, Jr. et al.
Carl Schmale GmbH & Co. KG
Dubno Herbert
Le Que T.
Nelms David C.
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