Harold W Pexton

42200849, Sep 2, 1980

Nov 7, 1978

5/958478

George Maclean - Oklahoma City OK
Eddy J. Milanes - Oklahoma City OK
Harold W. Pexton - Oklahoma City OK

Magnetic Peripherals Inc. - Minneapolis MN

B41F 1324

101235

As documents are moved serially past a servo motor-driven endorser, it endorses a stamp upon each. A transport signal dependent on document speed, and an endorser signal generated by an optical tachometer mounted to the servo motor, provide input to a frequency comparator. The output of the comparator is a control signal which controls the servo motor speed to adjust the endorser rotational surface velocity to equalization with the document speed. Logic circuitry sets the endorser at a zero angular position. Responsive to an endorse command, the endorser is accelerated to document speed, receives ink from a supply roller, then endorses the passing document. A counter and a digital comparator in cooperation with the tachometer signal completion of the endorsement whereupon the endorser is decelerated and placed in the zero position. Should a succeeding endorse command occur prior to complete deceleration, acceleration is resumed after a delay count given by a PROM and based upon the pulse count when the succeeding endorse command is received.

43285210, May 4, 1982

Apr 7, 1980

6/138032

Harold W. Pexton - Moore OK
Robert A. Smith - Oklahoma City OK

Magnetic Peripherals Inc. - Minneapolis MN

G11B 558
G11B 1732
G11B 2120

360104

In a data processing device using flexible magnetic disc media, apparatus is disclosed for improved positioning of a magnetic read/record head against the recording surface of a magnetic disc. A carriage, moveable radially on the disc, has two opposed swing arms pivotal between a load position and a retracted position. A gimbal spring is cantilevered to each swing arm and carries at its free end a transducer. A retainer is attached to the end of each swing arm. During movement of the swing arm toward the load position, each retainer is engaged with its associated gimbal spring and maintains its associated head in a controlled attitude as the head approaches the disc. In the load position, the heads are opposite one another against recording surfaces on opposite sides of the disc, and each is free of its associated retainer. As the swing arms are moved from the load position toward the retracted position, each retainer engages its associated gimbal spring to pull the associated head from the disc surface in a controlled attitude.

60501278, Apr 18, 2000

Jul 9, 1999

9/350839

Mukund Channagiri Rao - Oklahoma City OK
Harold Weaver Pexton - Moore OK

Seagate Technology, Inc. - Scotts Valley CA

G01N 330

73 1213

An apparatus and method for impact response testing of materials such as magnetic discs of a disc drive. The apparatus of the present invention supports a target disc in cooperative relationship with a sub-millimeter impact test ball such that the test ball can be dropped on selected portions of the target disc from selected heights above the target disc. The apparatus permits the method of observing the characteristics of a detent made in the target disc, by use of a high resolution surface profiler, and interpolating the observed characteristics to analytical standards which, for a given test ball size and drop height, indicate the dynamic hardness of the target disc at that test location. A vacuum is used to support the test ball above the disc, and a vacuum release valve is provided to negate the vacuum and release the test ball.

46239529, Nov 18, 1986

Jan 28, 1986

6/823234

Harold W. Pexton - Moore OK

Magnetic Peripherals Inc. - Minneapolis MN

H05F 300
H02K 700
F16M 1300

361220

A static eliminator comprises a contact mounted to a gimbal spring backed by a damping pad supported by a load spring. The contact bears against the polished end surface of the motor shaft of a disk drive so static electricity is grounded through the gimbal. The geometric arrangement of the contact and shaft is such as to prevent generation of vibration and excess noise as the spindle rotates.