| 摘要 |
<p>Apparatus for conveying a flat article, in particular an endless material web, with conveying means for moving the article in a predetermined direction and means for monitoring the transverse position of the moved article, characterised in that the monitoring means has a nozzle for directing a stream of a gaseous medium onto an edge region of the article, that on the side of the article opposite the nozzle are provided pressure measuring means for producing a measuring signal for the portion of the gas stream flowing past the edge, and that the pressure sensing means are connected to an evaluating and control arrangement for converting the measurement signal into position signals representing the position of the edge of the article. The signal is used to control the position of a pivotally mounted roller (16b, Fig. 3 not shown) by means of a motor (M). As described the nozzle 43 directs gas onto the edge of web 13 (which may be displaced transversely as indicated by arrow 13a), the gas stream producing a negative pressure in a sensor tube 51. <IMAGE></p> |
