Browse Prior Art Database

Tab Locating

IP.com Disclosure Number: IPCOM000073877D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Mishler, DD: AUTHOR [+2]

Abstract

Locating a typewriter carrier at all possible tab positions for setting tabs can be accomplished with the illustrated apparatus. Repositioning lever 1 and repeatedly depressing a tab key will cause the carrier to escape to each possible tab position. The depressing of the tab key by the operator will initiate rotation of leadscrew 5, having a stop mechanism 9 on one end, and an emitter wheel 8 on the other. The emitter wheel 8 has emitter spokes 10, and a home emitter spoke 7 which corresponds to each possible tab position. Rotation of leadscrew 5 will provide for escapement of the carrier and rotation of the pin wheel 11 having possible tab positions between lugs 6 corresponding to each revolution of the emitter wheel 8.

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Tab Locating

Locating a typewriter carrier at all possible tab positions for setting tabs can be accomplished with the illustrated apparatus. Repositioning lever 1 and repeatedly depressing a tab key will cause the carrier to escape to each possible tab position. The depressing of the tab key by the operator will initiate rotation of leadscrew 5, having a stop mechanism 9 on one end, and an emitter wheel 8 on the other. The emitter wheel 8 has emitter spokes 10, and a home emitter spoke 7 which corresponds to each possible tab position. Rotation of leadscrew 5 will provide for escapement of the carrier and rotation of the pin wheel 11 having possible tab positions between lugs 6 corresponding to each revolution of the emitter wheel 8. Each tab position contains a tab pin 15 position on wheel 11 that can be set or cleared when the carrier is at that position. In a normal tabular operation, the sensing of the set tab pin and home emitter spoke 7 stops rotation of leadscrew 5 at the set tab position. Repositioning lever 1 activates associated circuitry to cause leadscrew 5 to stop upon sensing home emitter spoke 7, and eliminates the requirement of sensing a set tabular stop. The advantage of this system is that an operator can easily locate the carrier at all possible tabular positions for setting or clearing tabs. This corresponds in a normal operation to the sensing of a set tab and of home emitter spoke 7, which stops rotation of leadscrew 5 through stop mechani...