Patent ID: 8591291

Claim:
A grinding apparatus, comprising: at least two oppositely arranged series of surfaces ( 1 a - 1 c ; 2 a - 2 c ) in slanting relative orientation and alternately overlapping each other forming a groove into which an edge or cutting edge is insertable for polishing by said series of surfaces, wherein surfaces of each series of surfaces are arranged in a common plane forming a side in a respective block ( 4 ; 5 ), the blocks ( 4 ; 5 ) arranged in a holder ( 7 ; 7 ′) by which each block is spring biased towards an opposite block, the blocks operated in reciprocating movement (U-D) transversely to a longitudinal direction of the edge or cutting edge while the surfaces contact opposite sides of the edge or cutting edge under spring action, and wherein the blocks are driven in reciprocating movement by means of a shaft ( 12 ) driven in rotation and a motion transferring means ( 10 ) rotating with the shaft, said motion transferring means configured to convert a rotation (R) of the shaft into a linear forth and back movement of the blocks.