Patent ID: 7347770

Claim:
A two-sided surface grinding apparatus comprising a pair of grinding whetstones rotatably supported with their grinding surfaces opposed to each other, a work rotation support means for supporting thin sheet-like work for rotation around a rotation axis parallel with the rotary shafts of said grinding whetstones in such a manner that at least parts of the grinding subject surfaces on the opposite surfaces are disposed in a grinding position between said grinding surfaces, and a pair of noncontact support means which are disposed so as to hold substantially the entire surface of a region outwardly of said grinding position in the grinding subject surfaces of said work and which noncontactly support said work by fluid pressure, the grinding subject surfaces on the opposite surfaces of said work being ground by rotating both said work and said grinding whetstones with said work supported by said noncontact support means, said noncontact support means being formed with substantially arcuate notches corresponding to said grinding whetstones at least over the central position of said work from their substantially circular outer edges, the noncontact support surfaces opposed to said work being provided with a plurality of pockets recessed therein and being provided with a single or a plurality of fluid supply holes in the inner wall thereof for discharging said fluid and also being provided with a netlike mesh section forming banks around the peripheries of said pockets, said mesh section being composed of peripheral edges disposed along the outer peripheries of the noncontact support surfaces and inside veins disposed so as to divide the region of the inside of the peripheral edges into a plurality of sections and connected to the peripheral edges in a plurality of inside-and-outside connecting sections, the portion of said peripheral edge which extends along said notches not being provided with said inside-and-outside connecting sections at least in the region excluding the vicinity of the central position of the work.