Mfe Corporation

David S Dunn

Edward F Burke, Jr

R Bruce Gifford

Fernando M Vasconselos

A vibration damper for a transducer positioning system of a diskette system employing a stepping motor for driving a moveable transducer carriage that is coupled to the stepping motor drive means. The mass of the carriage and the coupling means form a vibratory system having a natural frequency of oscillation significantly different from the frequency of the pulses applied to the stepping motor so that while the motion of the carriage reflects the total motion of the shaft, the incremental motions of the shaft are not transmitted to the carriage thereby minimizing noise ancillary to the positioning of the carriage.

Vibration damper for a transducer carriage drive mechanism for use in a

Apparatus for moving a transducer carriage intermittently along a tract relative to a recording medium employs belting arranged in a closed loop that is tensioned by engagement around at least one idler and connected to the carriage. Belt end segments comprising the loop are wrapped in opposite directions around the periphery of a stepping motor-driven capstan and their ends are secured thereto at axially spaced apart locations thereon. The belting and idlers are arranged so that all of the belt segments wrapped around the capstan remain parallel to the carriage track as the capstan rotates so as to advance the carriage a maximum number of increments along its track.

Transducer positioning apparatus

A floppy disk drive system employs an inside-out DC motor whose centrally located stator is mounted directly to the chassis. The motor has a tubular rotor that encircles the stator and it is supported co-axially with the stator by the rotary disk drive spindle. A timing and commutation disk is mounted directly on the rotor and, together with speed control and commutation networks, maintains uniform motor speed.

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Windham, NH, United States of America

David S Dunn