Patent ID: 6062118
Filing Date: 2000-05-16
Classification: F16H,Y10S,Y10T

Abstract:
A speed change gear mechanism for lathes, comprising:a rotatably supported driving shaft adapted to be driven by a power source, the driving shaft including a plurality of first gears securely mounted thereon to rotate therewith,a rotatably supported driven shaft including a plurality of second gears each rotatably mounted thereon via a bearing,a rotatably supported chuck shaft including a plurality of third gears securely mounted thereon to rotate therewith, the number of the second gears being a sum of the number of the first gears and the number of the third gears, and each of the second gears being meshed with a corresponding one of the first gears and the third gears,a rotatably supported camshaft including a cam formed thereon, the cam having a plurality of angular positions that correspond to different speeds of the chuck shaft,a follower guiding rod including a sleeve mounted therearound, the sleeve being slidable along the follower guiding rod, the sleeve including a follower securely attached to a first side thereof and a clutch securely attached to a second side thereof, the follower being engaged with and thus carried by the cam to cause sliding movement of the sleeve along tbe follower guiding rod, the clutch including a plurality of engaging teeth for selectively, releasably engaging with tvo of the third gears,means for driving the camshaft, andmeans for retaining the cam in one of the angular positions.