Abstract: A rolling apparatus is capable of rolling a metal ring to an accurate circumferential length and preventing the metal ring from dropping off. The rolling apparatus includes a metal ring support assembly having tension rollers 2a, 2b for supporting a metal ring W, a rolling roller 5 for rolling the metal ring W, a rolling assembly for pressing the rolling roller 5 against the metal ring W, a tension applying assembly having a tension cylinder 23 engaging tension roller support members 8, 10, 25, on which one of the tension rollers 2b is rotatably supported, for displacing the tension roller 2b to apply tension to the metal ring W, and a rolling processing completing assembly 27 for detecting a completion of rolling of the metal ring W and inactivating the rolling assembly and the tension applying assembly. The rolling assembly has a first resilient member 18 interposed between the rolling cylinder 14 and its piston rod 15.

Abstract: A drum slicing apparatus is capable of highly accurately and efficiently slicing a drum made of a thin metal sheet which is relatively highly flexible. The drum slicing apparatus has a support shaft rotatable about its own axis, a cylindrical drum holder supported on the support shaft for holding the drum by pressing engagement with an inner circumferential surface of the drum over an entire length thereof, and a slicing device having slicing edges for slicing the drum into the metal rings by engaging and cutting into the drum at predetermined cutting positions thereon while the drum is being rotated by the support shaft through the drum holder.

Abstract: A rolling apparatus is capable of rolling a metal ring to an accurate circumferential length and preventing the metal ring from dropping off. The rolling apparatus includes a metal ring support assembly having tension rollers 2a, 2b for supporting a metal ring W, a rolling roller 5 for rolling the metal ring W, a rolling assembly for pressing the rolling roller 5 against the metal ring W, a tension applying assembly having a tension cylinder 23 engaging tension roller support members 8, 10, 25, on which one of the tension rollers 2b is rotatably supported, for displacing the tension roller 2b to apply tension to the metal ring W, and a rolling processing completing assembly 27 for detecting a completion of rolling of the metal ring W and inactivating the rolling assembly and the tension applying assembly. The rolling assembly has a first resilient member 18 interposed between the rolling cylinder 5 and its piston rod 15.

Abstract: A drum slicing apparatus is capable of highly accurately and efficiently slicing a drum made of a thin metal sheet which is relatively highly flexible. The drum slicing apparatus has a support shaft rotatable about its own axis, a cylindrical drum holder supported on the support shaft for holding the drum by pressing engagement with an inner circumferential surface of the drum over an entire length thereof, and a slicing device having slicing edges for slicing the drum into the metal rings by engaging and cutting into the drum at predetermined cutting positions thereon while the drum is being rotated by the support shaft through the drum holder.