Machine for manufacturing sacks having folded bottoms from transversely fed tube sections

Claim 1

A MACHINE FOR MANUFACTURING SACKS HAVING FOLDED BOTTOMS, WHICH SACKS ARE MADE FROM TRANSVERSELY FED TUBE SECTIONS, PARTICULARLY OF PLASTIC MATERIAL, CHARACTERIZED BY MEANS WHICH PRECEDES THE BOTTOM-LAYING STATION AND SERVES FOR AUTOMATICALLY REJECTING ANY TUBE SECTION WHICH DIFFERS FROM THE DESIRED WIDTH BY MORE THAN A PREDETERMINED, ALLOWABLE TOLERANCE, SAID MEANS CONSISTING OF A PHOTOELECTRICAL SENSING STATION, AT LEAST ONE MOVABLE DEFLECTOR, AND ELECTROMAGNETIC MEANS CONTROLLED IN RESPONSE TO SAID SENSING STATION AND SERVING TO REJECT DEFECTIVE TUBE SECTIONS, AND WHEREIN STOPS ARE PROVIDED TO BE ENGAGED BY ONE OF THE LONGITUDINAL EDGES OF THE TUBE SECTION, PREFERABLY THE LEADING EDGE OF THE TUBE SECTION MOVING IN THE FEEDING DIRECTION, SAND SIGNALS INDICATING THE ACTUAL PASSAGE OF THE OTHER LONGITUDINAL EDGE OF THE TUBE SECTION ARE COMPARED IN THE PHOTOELECTRIC SENSING STATION WITH TWO SIGNALS REPRESENTING THE DESIRED PASSAGE TIMES FOR THE TWO TOLERANCE LIMITS OF THE RESPECTIVE LONGITUDINAL EDGE OF THE TUBE SECTION.