AUTOMATIC TENSIONING DEVICE FOR MULTIPLE LINE STRIP

摘要

An automatic tensioning device for separate strips in a multiple strand process line for preventing sagging of lines of strip and thereby guiding the strip in separate paths of travel and preventing their drifting into each other and characterized by separate sets of strip-engaging rolls which are responsive to strip sagging. Each set of rolls has one roll which drops by gravity in response to reduction in strip tension, thereby maintaining the tension necessary for guiding the individual strip in its designated line of travel. The apparatus includes a position-control servomechanism responsive to the position of the one roll and directed to strip drive rolls for increase of the strip speed and returning said one roll to its home position.