Browse Prior Art Database

Magnetic Transfer Device

IP.com Disclosure Number: IPCOM000091079D
Original Publication Date: 1969-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 40K

Publishing Venue

IBM

Related People

Aweida, JI: AUTHOR

Abstract

Complete files of variable length data records are accurately transferred from a master to a slave magnetic tape using magnetic transfer field techniques. Accuracy of the slave data is checked as it is recorded. Control circuitry prevents recording or transferring onto defective slave tape sections.

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Magnetic Transfer Device

Complete files of variable length data records are accurately transferred from a master to a slave magnetic tape using magnetic transfer field techniques. Accuracy of the slave data is checked as it is recorded. Control circuitry prevents recording or transferring onto defective slave tape sections.

Master tape to be copied passes from supply reel A to take-up reel A'. The slave tape passes between supply reel B and take-up reel B'. Buffering vacuum columns 10...13 can be included if needed. The tape paths coincide at clamp and transfer head area 15 so that the oxide surfaces are against one another. Slippage between the master and slave tapes during transfer is prevented by a mechanical or pneumatic clamp at 15. The transfer head at 15 causes master- to-slave data transfer. Capstans 16 and 17 drive the two tapes at identical speeds and directions during data transfers. Cleaners 18 and 19 and a relatively high-clamping force are used to minimize the possibility of separation between the two recording surfaces and to eliminate foreign particles from between the oxide surfaces. Read heads 20 and 21 detect the data on the two tapes. Erase head 22 permits selected erasure over defective portions of the slave tape.

Master and slave tapes are separately loaded and moved until the BOT marker is sensed, which introduces signals to terminal 30 and 31, thus conditioning And 32 to set latch 33. The set output from 33, through Or 34, raises a signal at terminal 35 to initiate application of the clamping force between the master and slave tapes at 15. The set output of 33 and the normally reset output of latch 37 condition And 36. The resulting signal at terminal 38 causes the magnetic transfer field to be introduced at transfer head 15. The terminal 45 signal signifies the presence of both the clamping force and transfer field at 15. This, along with the reset of 37 and the initial blank tape portions, the equivalent of IBG A and B at 46 and 47, provides inputs for And 41. To start the transfer, a signal at terminal 39 completes the conditioning of And 40 which, in turn...