Mechanism but cutting bed of quick replacement drill bit punches

The utility model belongs to the cutting bed field, concretely relates to mechanism but cutting bed of quick replacement drill bit punches. The design that spring, lock sleeve were adopted to it improves drill bushing fits, changes process control within half a minute with the drill bit. The locking breach on drill bushing upper portion is two semicircle breach combinations of differing in size and forms, and the chuck lower half is the annular table rank, and the lateral wall is porose, and the cover has the spring on the annular table rank, and the lock sleeve is the cylindric, and the locksleeve is inboard to be the cone angle structure, and there is the pit on drill bit upper portion, the inboard conical surface of drill bit direction one side contact lock sleeve is kept away from tothe steel ball, and the steel ball passes the hole of chuck lateral wall, and the steel ball is close to drill bit direction one side insertible drill bit upper portion pit, further compresses the spring, and the conical surfa