Browse Prior Art Database

Random Access Tape File

IP.com Disclosure Number: IPCOM000093095D
Original Publication Date: 1967-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

May, GH: AUTHOR [+2]

Abstract

The random access storage device comprises a plurality of record strips 10 fixed at one point 12 to base member 14. Strips 10 can be magnetic strips, punched strips, or cards. The strips can be of any desired length. A plurality of transducers 16 is mounted adjacent to base member 14. A drive is provided to produce relative cyclic motion between transducers 16 and strips 10 such as by rotating member 14, for example. The data on strips 10 is read by inserting a transducer 16 on a radial path between two strips 10 so that the relative motion between member and the transducer scans along the selected strip 10. Selection of a particular strip 10 is controlled by sensor 18 which is stationary relative to member 14.

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Random Access Tape File

The random access storage device comprises a plurality of record strips 10 fixed at one point 12 to base member 14. Strips 10 can be magnetic strips, punched strips, or cards. The strips can be of any desired length. A plurality of transducers 16 is mounted adjacent to base member 14. A drive is provided to produce relative cyclic motion between transducers 16 and strips 10 such as by rotating member 14, for example. The data on strips 10 is read by inserting a transducer 16 on a radial path between two strips 10 so that the relative motion between member and the transducer scans along the selected strip 10. Selection of a particular strip 10 is controlled by sensor 18 which is stationary relative to member 14. Sensor 18 emits an electrical signal as each strip 10 comes to the sensing position, due to the inclusion of slits 20 synchronized with the position of strip 10. A device, not shown, is provided for producing a home pulse. Thus by counting from the home pulse position, each strip 10 can be selectively addressed.

The mechanism in the lower drawing restores a transducer 16 back to the home transducer position and to the sense ready position after it is used to sense a strip 10. The movement of a transducer 16 is controlled by actuating single revolution clutch 22. The latter is coupled to drive a shaft having cams 24 and 26 mounted on it. Cam 24 is shaped to drive a transducer 16 along a spiral path between strips 10. Cam 26 cooperate...