Grinder for grinding a cylindrical or spherical surface of a roll, especially a paper machine roll

A grinder for grinding a cylindrical or spherical surface of a roll, such as a paper machine roll, which roll has associated with it a scraper apparatus including a scraper blade and a scraper blade carrier carrying said blade, said grinder comprising a frame (6) movable on rollers (8), on which frame is arranged a grinding mechanism (18) drivable by means of a motor (84), said rollers (8) being adapted for placement onto said scraper blade (10) or onto a rail (56) temporarily replacing said scraper blade (10) on said scraper blade carrier (16), said frame (6) having an engagement roller (14) arranged on an adjustable holder (12) for laterally engaging said scraper blade carrier (16), said grinding mechanism including a grinding belt (76), a floatingly supported contact roll (78), and guide rolls (80, 82) arranged on both sides of said contact roll for guiding said grinding belt (76) onto and off of said contact roll, and an alignment apparatus (122) for aligning said grinding belt relative to the roll (4) during its delivery to the roll (4).