Edge trimming shears for opposite positioning in shearing lines

Claim 1

EDGE TRIMMING SHEARS FOR POSITIONING OPPOSITE EACH OTHER ALONG A METAL SHEET TO TRIM THE SHEET EDGES WHILE THE SHEET IS IN MOTION COMPRISING IN COMBINATION A SUPPORT STAND, A KNIFE SUPPORT MOUNTED FOR RECIPROCATING MOVEMENT ON SAID SUPPORT STAND, A STRAIGHT LOWER KNIFE FIXED TO SAID KNIFE SUPPORT, A STRAIGHT UPPER KNIFE MOUNTED IN SAID KNIFE SUPPORT FOR VERTICAL MOVEMENT RELATIVE TO SAID KNIFE SUPPORT AND SAID LOWER KNIFE, FIRST POWER OPERATED MEAND FOR MOVING SAID KNIFE SUPPORT ON SAID SUPPORT STAND, RIGID, ELONGATE MEANS CONNECTED TO SAID UPPER KNIFE AT ONE END, SECOND POWER OPERATED MEANS FOR ENGAGING SAID RIGID ELONGATE MEANS AT THE OTHER END, SAID SECOND POWER OPERATED MEANS BEING ADAPTED TO LOCK IN POSITION TO PROVIDE A STATIONARY SUPPORT FOR SAID RIGID ELONGATE MEANS DURING THE CUTTING ACTION AND ADAPTED TO MOVE FROM SAID LOCKED POSITION TO LIFT SAID UPPER KNIFE AT THE END OF THE CUTTING ACTION, SAID FIRST POWER OPERATED MEANS ACTUATING SAID KNIFE SUPPORT TO MOVE SAID RIGID ELONGATE MEANS FROM AN INCLINED UPPER POSITION AT THE START OF THE CUTTING ACTION TO A VERTICAL LOWER POSITION AT THE END OF THE TRIMMING ACTION TO LOWER SAID UPPER KNIFE AND TRIM SAID METAL SHEET.