Disc drive arrangement for a hard disc cartridge having a carriage for accurately positioning a head relative to the cartridge

Claim 1

A disc drive arrangement for accessing information from and recording information onto a disc retained in a cartridge, which cartridge is insertable into the disc drive, comprising: at least one head; a carriage means for mounting and transporting said head; motor means for positioning at least a portion of said carriage means relative to said housing; wherein said carriage means includes: a track secured to said housing; a base upon which said head is mounted; and roller means for interconnecting said base to said track; said roller means includes at least first and second pairs of cylindrical rollers mounted on said base; wherein said cylindrical rollers ride on a plurality of rods mounted on said track; wherein said first pair of cylindrical rollers includes first and second cylindrical rollers mounted side by side; wherein said second pair of cylindrical roller is located adjacent the first pair of cylindrical rollers and said second pair of cylindrical rollers includes third and fourth cylindrical rollers mounted side by side; wherein said first and third cylindrical rollers are mounted side by side, and said second and fourth cylindrical rollers are mounted side by side, with either the first and fourth rollers, or the second and third cylindrical rollers being disposed at an angle with respect to the other of the first and fourth rollers, or the second and third cylindrical rollers and with respect to said track in order to stabilize the base relative to the track; and wherein said cylindrical rollers describe substantially a line as said cylindrical rollers roll on said rods so that any contaminants accumulated on said rods are not crushed between said cylindrical rollers and said rods but are urged to one or the other side of said rods so that such contaminants do not interfere with the accurate positioning of said base and head mounted thereon.