Disk drive structure with an adjustable bearing structure fur guide bars

An adjustable bearing structure for holding one bar end of a guide bar, mounted on a base, comprising:

• a housing, forming an accommodation space with the base therebeneath for receiving the respective bar end, further including a position stud extruding downward;
• a through hole of the base, located aside to the bar end received by the accommodation space;
• a spring arm, mounted on the base, located aside to the bar end but opposing to the through hole, further including a free end pressing upon the bar end;
• and
• a cam pillar, rotationally mounted in the through hole, further including thereof:
• a position surface, close to the housing, further including a pivotal point as a rotation center of the cam pillar with respect to the housing;
• an adjusting surface, opposing to the position surface;
• a pillar surface, connecting the position surface and the adjusting surface, further including a cam surface to contact with the bar end;
• a plurality of position holes for receiving the position stud, located at the position surface by circling around the rotation center;
• and
• an adjusting port, located at the adjusting surface;
• wherein, by using an adjusting means to pair the adjusting port and thereby to rotate the cam pillar around the rotation center, the cam pillar is rotated to have the position stub engage with a particular one of the position holes so as to form a stop between the housing and the cam pillar.