Machine for forming sheets of plastic material

Claim 1

IN A DEVICE OF THE CHARACTER DESCRIBED, A CONVEYOR; MEANS FOR MOVING SAID CONVEYOR; A HOPPER ADAPTED TO CONTAIN PLASTIC MATERIAL AND TO DELIVER SAME TO SAID CONVEYOR; MEANS INCLUDING A MOTOR-DRIVEN KNIFE ADAPTED TO BE CONTINUOUSLY MOVED TRANSVERSE SAID CONVEYOR AND POSITIONED ADJACENT THE SURFACE THEREOF, SAID KNIFE HAVING A CUTTING EDGE EXTENDING IN A DIRECTION OPPOSITE TO THE MOTION OF SAID CONVEYOR; MEANS POSITIONED ADJACENT SAID KNIFE AND LOCATED WITHIN SAID HOPPER AND ADAPTED TO ENGAGE SURPLUS MATERIAL LYING ABOUT SAID KNIFE AND CONVEY SAID MATERIAL AWAY FROM SAID KNIFE WHEREBY THE MATERIAL LYING ABOVE AND ENGAGED BY SAID KNIFE MAY BE SEPARATED FROM MATERIAL LYING BELOW SAID KNIFE IN SAID HOPPER, SAID LAST NAMED MATERIAL BEING CONVEYED IN SHEET FORM BY SAID CONVEYOR TO A POINT BEYOND SAID KNIFE.