Patent ID: 7320268

Claim:
A cutting and edge-preparing apparatus, comprising: a housing adapted to be mounted on a workpiece; a faceplate mounted on a front surface of said housing and being rotatable relative to said housing; at least one tool holder mounted on said faceplate for holding a tool; a gearbox having first gearing for turning said faceplate and second gearing connected to a power transmission shaft for advancing and retracting said tool holder relative to the workpiece; and a motor; said first and second gearing each having a predetermined number of teeth, and said number of teeth of said first gearing being different from said number of teeth of said second gearing; and said second gearing having a changeable combination of gears for changing the difference between said number of teeth of said first gearing for turning the faceplate and said number of teeth of said second gearing for turning said power transmission shaft; whereby, turning direction and turning speed of said power transmission shaft relative to turning speed of said faceplate can be changed to permit said tool holder to be moved relative to the workpiece in rapid-feed, slow-feed, and rapid-return modes.