公开(公告)号：WO1990000798A1

公开(公告)日：1990-01-25

申请号：PCT/US1989002752

申请日：1989-06-26

Applicant: GUZIK TECHNICAL ENTERPRISES, INC. ,  GUZIK, Nahum ,  RAO, Vinod, K.

Inventor： GUZIK TECHNICAL ENTERPRISES, INC.

IPC: G11B17/028

CPC classification number: G11B17/0282 ,  Y10T279/1054 ,  Y10T279/1091

Abstract: A ball-type clamping mechanism for clamping computer hard disks in a disk tester for accurate measuring of the disk's parameters comprises a cup-shaped support (10) which is installed on a rotating part of the tester and serves to support a computer hard disk (20) which rests on the upper surface of the support. The support has a cylindrical opening (12) with a diameter equal to or slightly greater than the diameter of the disk opening. Slidingly inserted into the support (10) is a cylindrical retainer (26) which carries clamping balls (28) uniformly spaced from each other in a circumferential direction and located in recesses (30) formed in the side wall of the retainer. The balls have a diameter larger than the side wall of the retainer (26). A pull rod (40) passes through the central opening in the bottom wall of the support and carries a clamping cone (42) which is made from a resilient material softer than the material of the balls (28). When the rod is pulled down, a conical surface (50) of the clamping cone (42) pushes the balls radially outwardly into contact with the inner periphery of the hard disk, so that the disk is clamped. The number of balls exceeds three, so that a uniform clamping force is provided on each balls. Because the cone is made from a resilient material, the balls clamp the disk with a uniform force without the necessity of manufacturing the parts with accurate tolerances.

公开(公告)号：WO1990003030A1

公开(公告)日：1990-03-22

申请号：PCT/US1989003977

申请日：1989-09-13

Applicant: GUZIK TECHNICAL ENTERPRISES, INC.

Inventor： GUZIK TECHNICAL ENTERPRISES, INC. ,  GUZIK, Nahum ,  RAO, Vinod, K.

IPC: G11B05/56

CPC classification number: G11B5/012 ,  G11B5/455 ,  G11B5/488 ,  G11B21/00

Abstract: A magnetic head and disc tester imitates motions of the head on a hard disc drive and comprises a stationary base (22), a slide mechanism (24) which can be installed in any required position on the base (22) with respect to a center of rotation of a magnetic disc (D). The disc (D) is rotatingly supported by a spindle unit (42) fixed to the stationary base (22). A magnetic head (52) to be tested is attached to the end of an arm (16) which is pivotally supported on a slide (36) of the slide mechanism. The angular position of the longitudinal axis of the magnetic disc with respect to a tangent to a given track of magnetic disc (52), i.e., a skew angle, can be adjusted and the head can be fixed in the adjusted position. For measuring the paramaters of the head of the disc, the slide (36) is moved linearly and carries the magnetic head over the disc in a linear direction, the head being installed at a required skew angle by means of the above-mentioned angular adjustment. Thus, instead of rotary motion of the head with respect to the disc tracks, it is moved linearly, but maintains the same skew angle as on the disc drive. Although this approximation produces some tracking error, it is negligible, and the tester has a simpler construction and universal applicability.