Apparatus for separating waste and work in cut sheets

Claim 1

APPARATUS FOR SEPARATING A WASTE PORTION FROM A DIECUT SHEET COMPRISING A PAIR OF COUNTER-ROTATING UPPER AND LOWER ROLLS BETWEEN WHICH THE SHEET IS PASSED ALONG A SUBSTANTIALLY HORIZONTAL PLANE, A JACKET OF FLEXIBLE SHEET MATERIAL PROVIDED ON THE LOWER ROLL, A CHAMBER PROVIDED WITHIN THE LOWER ROLL, A CUT-OUT PROVIDED IN THE JACKET IN REGISTER WITH SAID WASTE PORTION, AIR PASSAGES CONNECTED BETWEEN THE CHAMBER AND THE PERIPHERY OF THE LOWER ROLL IN POSITIONS TO COMMUNICATE WITH SAID CUT-OUT, MEANS PROVIDED AT THE PERIPHERY OF THE UPPER ROLL COOPERATING TO PUSH THE WASTE PORTION FROM THE SHEET INTO SAID CUT-OUT WHEN THE WASTE PORTION PASSES THE NIP OF THE ROLLS, A SOURCE OF SUCTION CONNECTED TO SAID CHAMBER AND COOPERATING TO SUCK THE WASTE PORTION PUSHED AS AFORESAID INTO ENGAGEMENT WITH THE PERIPHERY OF THE LOWER ROLL FOR THE WASTE PORTION TO ADHERE TO THE LOWER ROLL AND TO BE CARRIED THEREBY INTO A POSITION CLEAR OF THE PLANE OF THE SHEET, AND MEANS FOR RELEASING THE SUCTION AFTER A PRE-DETERMINED AMOUNT OF TRAVEL OF THE WASTE PORTION FROM THE NIP OF THE ROLLS AND PRIOR TO THE RETURN OF THE CUT-OUT TO SAID NIP.