Pertec Corporation

Pertec Computer Corporation

Lewis William Bleiman

A flexible magnetic disk drive system including a read/write head carried by a carriage that is threadably engaged with a lead screw, but with the head carriage being free to pivot a fraction of a turn about the axis of the lead screw to move the head against and away from the disk.

Disk drive apparatus

A system for driving a flexible magnetic disk including a direct current stepper motor having a shaft directly connected to the disk drive hub. Motor controller means activate the motor to bring it from rest up to a desired speed, e.g., 360 rpm, and thereafter maintain the speed constant. The motor controller initially provides a detent pulse to move the rotor to a starting position and then provides pulses of decreasing duration and increasing frequency to accelerate the motor to the desired speed.

Spindle drive motor

In a flexible magnetic disk drive apparatus including a housing having an entrance slot for receiving a disk carrying cartridge, means for engaging said cartridge to either properly position it relative to a disk clamp and drive mechanism or eject it out through said entrance slot. The means is comprised of a fixed positioning surface or flange located adjacent to said entrance slot and a spring mounted ejector member for engaging the leading edge of said cartridge to urge the cartridge trailing edge against said positioning surface.

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Northridge, CA, United States of America

Lewis William Bleiman