Patent ID: 11967506
Assignee: DISCO CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC H  B | IPC B  H

Claim 7:
8. The grinding apparatus according to claim 1, further comprising: a fourth grinding mechanism for grinding the wafer held on the holding surface of one of the chuck tables by keeping lower surfaces of fourth grindstones arranged in an annular array on a fourth grinding wheel in contact with a radial area of the wafer; a fourth grinding feed mechanism for grinding-feeding the fourth grinding mechanism in a grinding feed direction perpendicular to the holding surface of one of the chuck tables; and a fifth chuck table mounted on the turntable such that the at least four chuck tables comprises five chuck tables; wherein the first grinding feed mechanism includes a first column and a first holder configured and arranged for holding the first grinding mechanism, wherein the first holder is movable in the grinding feed direction with respect to the first column, and further wherein the first column includes a first curved portion between a pair of first posts, where the first holder is positioned within a first opening defined by the first curved portion; wherein the second grinding feed mechanism includes a second column and a second holder configured and arranged for holding the second grinding mechanism, wherein the second holder is movable in the grinding feed direction with respect to the second column, and further wherein the second column includes a second curved portion between a pair of second posts, where the second holder is positioned within a second opening defined by the second curved portion; wherein the third grinding feed mechanism includes a third column and a third holder configured and arranged for holding the third grinding mechanism, wherein the third holder is movable in the grinding feed direction with respect to the third column, and further wherein the third column includes a third curved portion between a pair of third posts, where the third holder is positioned within a third opening defined by the third curved portion; wherein the fourth grinding feed mechanism includes a fourth column and a fourth holder configured and arranged for holding the fourth grinding mechanism, wherein the fourth holder is movable in the grinding feed direction with respect to the fourth column, and further wherein the fourth column includes a fourth curved portion between a pair of fourth posts, where the fourth holder is positioned within a fourth opening defined by the fourth curved portion; and wherein the first posts, the second posts, the third posts and the fourth posts all extend in radial directions towards the central axis of the turntable.