Rotational Equalization of Disc Actuators
Original Publication Date: 1988-Mar-01
Included in the Prior Art Database: 2005-Feb-14
In a disk file with a multiple disc stack, actuator arms are supported and rotated by vertical unequal length spindles, one on either side of the stack. To equalize the rotational characteristics of the actuator arms, the shorter of the two spindles is lengthened by a mass to provide dynamic compensation. The figure illustrates the arrangement with a central disc spindle rotating supporting the disc stack 2. Actuator spindle 3 supporting and rotating heads 4 is longer than spindle 5 as its actuator 6 accesses the uppermost surface of the stack. Normally, spindle 5 would not extend higher than necessary to carry actuator 7 to the surface it is serving. A mass 8 is added to equalize the rotational characteristics of the actuator assemblies carried by spindles 3 and 5.