Patent ID: 6095730
Filing Date: 2000-08-01
Classification: B23D,Y10T

Abstract:
A table-top type key-seater comprising:a reduction gear with a motor;bearing means for supporting rotatably a driving shaft coupled directly to said reduction gear;a reciprocating table provided with a cutting tool holder driven so as to reciprocate along a linear guide disposed in a perpendicular direction through crank means linked with said driving shaft in one body;a cutting tool for cutting a key groove mounted on said cutting tool holder;a work table for moving horizontally in left- and rightward directions, to which an object to be processed having a throughhole is secured;a feed table for moving horizontally said work table in forward and backward directions;measuring means for setting a center position of processing, starting from a displacement amount of said work table with respect to left and right contact positions of said cutting tool brought into contact with an inner wall of said throughhole;feeding means for making said feed table move intermittently with a feed pitch for securing a predetermined depth of cut for every reciprocation of said cutting tool in synchronism with reciprocating movement of said cutting tool; andmeans for setting a depth of said key groove, which stops the reciprocating drive of said cutting tool at an upper limit in a perpendicular direction, when a cut of said key groove reaches a predetermined depth of said key groove, wherein said work table is electrically insulated so that contact of said cutting tool with said inner wall of said throughhole is capable of being detected electrically.