The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 1994
Filed:
Jul. 08, 1993
James J Ressmeyer, Apple Valley, MN (US);
Lloyd C Goss, Bloomington, MN (US);
Martronics, Inc., Burnsville, MN (US);
Abstract
In positioning a transducer head with respect to a supporting arm, the transducer head is subject to both a normal force and a moment force and has first and second air bearing surfaces. The apparatus includes a controller and first and second sensors for detecting the overturning moment and being adapted for providing data representative of the overturning moment to the controller. A first actuator varies the position of the load arm and a second actuator varies the position of the transducer head. The first and second actuators act in concert to negate the overturning moment. A third sensor detects the position of the first air bearing surface with respect to a known level reference and a third actuator positions the first air bearing surface of the transducer head. A fourth sensor detects the position of the second air bearing surface with respect to a known level reference and a fourth actuator positions the second air bearing surface of the transducer head. The controller calculates total normal force and differential force loads on the air bearing surfaces and generates commands to the first and second actuators to position the transducer head responsive to the calculated forces to achieve a desired differential force loading on the first and second air bearing surfaces after the head is glued to the load arm.