A MACHINE FOR UNWINDING AND AUTOMATICALLY CONNECTING SHEET MATERIAL.

摘要

A MACHINE FOR UNWINDING AND AUTOMATICALLY CONNECTING SHEET MATERIAL SUCH AS POLYETHYLENE FILM, NON-WOVEN OR CELLULAR SHEETS AND THE LIKE COMPRISING TWO FRAMES MOUNTED TO ROCK BETWEEN AN OPERATIVE POSITION AND A STAND-BY POSITION, REELS OF SHEET MATERIAL BEING DRIVEN AT THE PERIPHERY THEREOF AT A SPEED WHICH IS CONTROLLED BY THE UNWINDING SPEED, REQUIRED AT THE DOWNSTREAM END OF THE MACHINE. THE SHEET PASSES THROUGH A FIRST OF THE SAID ROCKABLE FRAMES AND PASSES AROUND A DISCHARGING ROLLER. WHEN THE END OF THE REEL IS DETECTED, THE SECOND REEL IS DRIVEN AT THE PERIPHERY THEREOF, THE SECOND ROCKABLE FRAME IS BROUGHT INTO OPERATION, A DRIVING ROLLER IS BROUGHT INTO COOPERATION WITH THE DISCHARGING ROLLER, AND THE FRONT END OF THE SECOND SHEET, WHICH HAS BEEN PREVIOUSLY SUPPLIED WITH AN ADHESIVE, IS CONNECTED TO THE FIRST SHEET. A PHOTOELECTRIC CELL THEN INITIATES THE CUTTING OF THE FIRST SHEET WHEN THE CONNECTING REGION IS DETECTED.@@(FIG. 1)