| 摘要 |
A ROTARY CUTTING APPARATUS COMPRISES A ROTARY SHAFT ASSEMBLY (18) HAVING AN AXIS AND ADAPTED TO HOLD A CUTTING TOOL COAXIAL WITH THE AXIS AND, A FEED MECHANISM(20) FOR MOVING THE CUTTING TOOL HELD BY THE ROTARY SHAFT ASSEMBLY (18) ALONG THE AXIS OF THE ROTARY SHAFT ASSEMBLY (18). THE ROTARY SHAFT ASSEMBLY (18) COMPRISES A PROXIMAL ROTARY SHAFT (22), AN INTERMEDIATE (24), A DISTAL ROTARY SHAFT (26) WHICH ARE SUCCESSIVELY TELESCOPICALLY CONNECTED, AND A CYLINDRICAL HOUSING ROTATABLY HOLDING THE DISTAL ROTARY SHAFT AND MOVABLE ALONG THE AXIS TOGETHER WITH THE DISTAL ROTARY SHAFT (26). THE FEED MECHANISM (20) COMPRISES A FIRST RACK (31,32) MOUNTED ON THE CYLINDRICAL HOUSING AND EXTENDING IN PARALLEL WITH THE AXIS OF THE ROTARY SHAFT ASSEMBLY, A SECOND RACK (31,32) SECURELY MOUNTED ON THE BODY (14) IN PARALLEL WITH THE FIRST RACK (31,32) ; AND, A PINION (34) POSITIONED BETWEEN AND ENGAGED WITH THE FIRST AND SECOND RACKS (31,32). |
