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Browse Prior Art Database

File Protect Device

IP.com Disclosure Number: IPCOM000088957D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Ross, CA: AUTHOR

Abstract

This device comprises a torsion spring, bell crank and microswitch arrangement to sense the presence or absence of a file protect ring in a tape reel, with no frictional contact of moving parts.

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File Protect Device

This device comprises a torsion spring, bell crank and microswitch arrangement to sense the presence or absence of a file protect ring in a tape reel, with no frictional contact of moving parts.

Assume file protect ring 1 has been removed from tape reel 2, and the reel is mounted on the hub of latch assembly 3. All parts will be in the positions shown in Figs. 1A and 1B. Bell crank 4 will be held against pin 5 by torsion spring 6, and pin 7 will be retracted from microswitch 8. Pin 9 will float in the center of a slot 10 in ring 11, allowing the reel, latch assembly and ring 11 to rotate in unison without rubbing the pin. Rim 11a of ring 11 will project into and float in groove 12 of reel 2.

If file protect ring 1 is inserted in reel 2, then various parts will be shifted to the positions shown in Figs. 2A and 2B when the reel is mounted on latch assembly 3. Ring 1 will shift ring 11, thereby displacing pin 9 and causing torsion spring 6 to rock bell crank 4 against stop pin 13 and cause pin 7 to contact and activate microswitch 8. Note that bell crank 4 is still positioned to allow pin 9 to float in the center of slot 10 and thus not rub on ring 11 when it and the latch assembly and reel are rotated.

When reel 2, with file protect ring 1 in place, is removed from latch assembly 3, spring 14 will return ring 11 to normal position and all parts (except the removed reel) will be positioned as shown in Figs. 1A and 1B.

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