Patent ID: 7484444
Filing Date: 2009-02-03
Classification: B28D,Y10T

Abstract:
1. A cutting device comprising: a holding member for holding a workpiece, a pair of rotating spindles, a pair of cutting blades of the same cross-sectional shape such that the cutting blades are interchangeable for cutting the workpiece held by said holding member, said cutting blades being rotated by said spindles, a wear amount detecting member for detecting an amount of wear of each of said pair of cutting blades, a control member, a rotating spindle height detecting member for detecting a height of each spindle of said pair of rotating spindles, a cutting blade detecting member corresponding to each cutting blade, each cutting blade detecting member including a light emitting element and a light receiving element with one of said cutting blades arranged therebetween, and said cutting blades are movable toward and away from each other, and are movable toward and away from said holding member, said control member is arranged to selectively cut the workpiece by both of said cutting blades, or by one of said pair of cutting blades, said wear amount detecting member calculates the amounts of wear of each of said cutting blades based on a difference between the height of their rotating spindles as detected by said rotating spindle height detecting member, and a predetermined position of each of said cutting blades as detected by said comparing member, and when the workpiece is to be cut by one of said pair of cutting blades, said control member selects whichever cutting blade has a smaller amount of wear as calculated by said wear amount detecting member to cut the workpiece.