Patent ID: 6390888
Filing Date: 2002-05-21
Classification: B24B

Abstract:
A grinder pressing device comprising an air cylinder (1) in a vertical posture, a guide table (G2) and a guide (G1), wherein one of a bottom portion of a cylinder main body (10) and a piston rod (11) of said air cylinder (1) is fixed to a fixed plate (2) and other is mounted to a movable plate (3) disposed below said fixed plate (2), one of said guide table (G2) and said guide (G1) is mounted to a movable plate (3) side and other is mounted on an outer peripheral face of said cylinder main body (10), said guide table (G2) is guided on said guide (G1) in a vertical direction under a rolling frictional condition through balls (B), said air cylinder (1) is formed in a manner that hermeticity is provided by metal seals (MS) between outer peripheral walls of a piston (12) and said piston rod (11) and a structural wall of said cylinder main body (10) side so as to set friction coefficients between said walls low and that said piston rod (11) is supported by a ball bushing (BS) in a large area to move forward and backward, said movable plate (3) is provided directly or through another member with a grinder (G), and pressing force applied to an object to be ground by said grinder (G) can be controlled by adjusting air pressure of upper and lower cylinder chambers (13, 14) separated by said piston (12).