Patent ID: 7052378

Claim:
A liquid jet machining apparatus including holding means for holding a workpiece, liquid jet application means for applying a liquid jet to the workpiece held by said holding means, and catching means for catching the liquid jet which has penetrated the workpiece, said catching means including a tank for accommodating a liquid, and wherein at a bottom of said tank, a cushioning member is replaceably disposed, and an abrasive is accumulated, and after the liquid jet having penetrated the workpiece acts on the liquid accommodated in said tank, the liquid jet acts on said cushioning member and said abrasive, and wherein the liquid jet advances into said tank substantially vertically downwardly, said tank is erected, a bottom wall of said tank has a first inclined portion inclined downwardly toward one side in a width direction, and a second inclined portion inclined upwardly toward the one side in the width direction in succession to said first inclined portion, and said cushioning member extends along said first inclined portion, and wherein a length in an inclination direction of said first inclined portion is larger than a length in an inclination direction of said second inclined portion, a site of said cushioning member acted on by the liquid jet is located at a higher position than an upper end of said second inclined portion, and in a rest state where the liquid jet is not applied to the workpiece, an upper surface of the abrasive accumulated in said tank is above said site of said cushioning member.