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Magnetic recording head motion translation apparatus for head/media evaluation systems
| Details |
Inventors: Miller, John H.; Moore, Peter C.;
Assignee: Cecil & Hume Associates, Inc. (Morgan Hill, CA)
Primary Examiner: Heinz; A. J.
Assistant Examiner:
Attorney, Agent or Firm: Rosenblum, Parish & Bacigalupi
A magnetic recording head motion translation apparatus for use in head/media evaluation systems is disclosed which includes a translator base for holding a magnetic recording head over a media surface, a linear drive unit, and a cam shaped in a pattern that is proportional to the path that the magnetic recording head will follow over the surface of the media. The translator base is equipped with head loading/lifting capabilities and a cam follower bearing, which maintains contact with the cam. The linear drive unit is a stepper motor in combination with a lead screw. Cross-roller bearings are used to connect the linear drive unit to the translator base, thereby providing a stable force in the direction of the Y-axis, while allowing the translator base to move in the direction of the X-axis. The cross-roller bearings are spring loaded in the direction of the cam to force the cam follower bearing to follow the cam's pattern. In operation, the cross-roller bearings directly transmit the linear force of the linear drive unit to the translator base, thereby assuring the accurate positioning of the head over the desired track of the media. At the same time, the cross-roller bearings allow the translator base to slide in the X-axis direction, thereby allowing the head to move across the surface of the media along the path determined by the pattern of the cam. Changing the cam will allow the path followed by the head across the media to be modified. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In reference to FIG.
1 of the drawing, there is shown a partially-broken top view of a magnetic recording head motion translation apparatus in accordance with the preferred embodiment of the present invention.
A translator base assembly 10 is mounted on a support platform (directly underneath base assembly 10, and not shown in FIG.
1) with mounting bolts 12.
The support platform is coupled to a linear drive unit 14, which supplies a stable force in the direction of the X-axis, as shown in FIG.
1.
A support bracket 16 is affixed to the right side of the upper portion of base assembly 10 with bolts 18.
Support bracket 16 is shaped to form a recess along a portion of its length, in which rests a head loader/lifter arm 20.
Head loader/lifter arm 20 is spring loaded against support bracket 16 with spring 22.
Spring 22 pushes the rear end of arm 20 upward, which in turn causes arm 20 to pivot over pivot pin 24 and force the front end of arm 20 downward against a slide 26.
The underside of arm 20 is shaped to cause arm 20 to contact, or not contact slide 26 depending upon the position of arm 20.
When arm 20 is in the lifted position, it rests upon slide 26, and when arm 20 is in the loaded position it does not touch arm 20.
A finger 28 is attached to the front side of arm 20 with bolts 30.
Finger 28 extends under the head support flexure 32 of magnetic recording head 34 and serves to lower(load) and raise(lift) head 34 from the surface of media 36.
Head 34 is loaded onto the surface of media 36 by moving base assembly 10 and arm 20 forward.
This causes the underside of arm 20 to move along slide 26 until the two are no longer in contact, at which point head 34 is in contact with media 36, thereby providing any necessary support to arm 20.
Slide 26 is affixed to spin stand base 38 with bolt 40 and the position of slide 26 may be adjusted by moving slide 26 within adjustment notch 42 and re-tightening bolt 40.
A stop bracket 44 is also provided to keep arm 20 from being lowered too far, such as might happen if no media were present and arm 20 was moved to the load position
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