Apparatus for straightening bow in fabric in a tenter frame
OwnerFrank W. Leitner, Sr.inventor
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Abstract
An apparatus and method for correcting the bow distortions in a fabric web during a tentering operation is disclosed, and which includes a tension applying means at each of the entry and exit ends of the tenter frame, and such that a tension is applied at each of the respective opposite ends of the tenter, with the applied tensions being directed in opposite directions. A sensor is provided for detecting either a leading or a trailing bow in the advancing web, and a control system is provided which acts in response to a signal from the sensor to change the tension applied at one or both ends of the tenter frame and thereby straighten the bow.
Claims9
In a tenter frame comprising a pair of laterally spaced, elongate and longitudinally movable first and second fabric engaging means for advancing a fabric web forwardly while applying lateral tension thereto, the combination therewith of means of correcting a laterally extending bow in the advancing fabric web and which comprises
- entry and exit tension applying means positioned at respective entry and exit ends of the tenter frame for applying a variable longitudinal tension to the advancing web at each of said ends of the tenter frame, and with the applied tensions being applied in opposite directions and so as to act against each other,
- means for sensing a laterally extending bow in the advancing fabric, and
- control means operatively connected to said sensing means and to both of said entry and exit tension applying means for selectively adjusting the tension applied by one or both of said entry and exit tension applying means in response to a signal from said sensing means and so as to automatically eliminate any laterally extending bow in the advancing sheet.
Dependencies are inferred from the claim text.