Browse Prior Art Database

LOW COST MAGNETOGRAPHIC PRINTER

IP.com Disclosure Number: IPCOM000025305D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 109K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the figure, a low cost magnetographic printer 20 is shown which records at 400 inches per second and reduces meed to 31) inches per second for printing. A cylindrically shaped magnetic tape 10 is positioned over a hydrostatic air 3earing post 6 which is internally pressurized. The cylindrical tape is held on the post bv a fixed shoulder (not shown) on one end and a removable flange (not shown) on the other end. The air bearinq in the post suspends the tape circumferentially from the post and positions the tape accurately between the flange and shoulder by actions commonly referred to as "pneumatic bleed servo" (in reference to U.S. Patent 3,225,600).

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XEROX DISCLOSURE JOURNAL

LOW COST MAGNETOGRAPHIC PRINTER
Klaus K. Stange


,

20

/-

Proposed Classification 1J.S. Cl. 346/74.1
Int. C1. Gold 15/06

In the figure, a low cost magnetographic printer 20 is shown which records at 400

inches per second and reduces meed to 31) inches per second for printing. A cylindrically shaped magnetic tape 10 is positioned over a hydrostatic air 3earing post 6 which is internally pressurized. The cylindrical tape is held on the post bv a fixed shoulder (not shown) on one end and a removable flange (not shown) on the other end. The air bearinq in the post suspends the tape circumferentially from the post and positions the tape accurately between the flange and shoulder by actions commonly referred to as "pneumatic bleed servo" (in reference to U.S. Patent 3,225,600).

749

Volume 9 Number 4 July/August 1984

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LOW COST MAGNETOGRAPHIC PRINTER (Cont'd) .

To record, pneumatic capstan 12 pneumatically engages tape 10 by connecting chamber 11 to a vacuum. Capstan 12 is continuously run at 400 inches Der second, so that the tape immediately accelerates to 400 inches per second. At this speed the cylindrical tape 10 generates a hydrostatic air bearing on too of capstan 5 which is continuously rotating at only 30 inches per second. Since capstan 5 is also pneumatic, it is pressurized during recording. As soon as the speed of the tape reaches 400 inches per second, retractable and traversing recording head 9 beeins to write. When all of the latent image is written, the high capstan I? is pressurized which lifts the tape out of contact with it.

For printing, the pressurized air on the low speed capstan 5 is turned off and pressurized air capstan 12 is turned on. The tape raDidly decelerates to the processing speed of 30 inches per second. The rapid veloc...