Browse Prior Art Database

Media Transporting

IP.com Disclosure Number: IPCOM000076915D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Griffiths, DE: AUTHOR [+2]

Abstract

In some magnetic tape transports, magnetic head 10 is indexed laterally to media 11 for accessing various sets of tracks. During such indexing, drag is produced on the tape which tends to move the tape out of its guided path. During nondata processing media transport, excessive wear may occur on head 10. Such problems can be avoided by selectively vacuum lifting media 11 away from head 10.

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Media Transporting

In some magnetic tape transports, magnetic head 10 is indexed laterally to media 11 for accessing various sets of tracks. During such indexing, drag is produced on the tape which tends to move the tape out of its guided path. During nondata processing media transport, excessive wear may occur on head
10. Such problems can be avoided by selectively vacuum lifting media 11 away from head 10.

Media take up and supply systems 12 and 13 selectively transport media 11 past head 10 via guides 14 and 15, to provide positive tension on the media for suitable transducing operations. All operations are sequenced by controls 20.

To selectively lift media 11 to dotted line position 21 or 22, controls 20 actuate vacuum source 24. When media 11 is vacuum lifted to position 22, source 24 clamps media 11 against perforated surface 25 of air conduit 26, freeing media 11 from head 10. By reducing the vacuum force, media 11 is only lifted to position 21 wherein it can be selectively transported past head 10 and head 10 can be selectively laterally indexed. Note that along the longitudinal path, vacuum chamber 26 has the same general extent as head 10. The lateral extent of the vacuum chamber is equal to the width of media 11.

Similar results can be obtained by providing a pair of vacuum chambers opposite the end portions 30 and 31 of head 10. Simultaneous to vacuum urging, media take up and supply systems 12 and 13 may be actuate to release tension somewhat from m...