Browse Prior Art Database

Detection of Page End Condition from Track Indicator

IP.com Disclosure Number: IPCOM000074672D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Rogers, WF: AUTHOR

Abstract

When transferring text from one magnetic card to another on a Magnetic Card "SELECTRIC" Typewriter system (MC/ST) while making text or format revisions, the original card to output page correspondence is often lost. In this case, the operator must watch the page to determine when to stop the printing for each page. There is a need for a way to indicate how many lines are printed before automatically stopping so that constant operator monitoring is not required.

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Detection of Page End Condition from Track Indicator

When transferring text from one magnetic card to another on a Magnetic Card "SELECTRIC" Typewriter system (MC/ST) while making text or format revisions, the original card to output page correspondence is often lost. In this case, the operator must watch the page to determine when to stop the printing for each page. There is a need for a way to indicate how many lines are printed before automatically stopping so that constant operator monitoring is not required.

Illustrated is a modification to the MC/ST which will alleviate the stated problem. As shown, a page end selector is added to the console. The operator positions the page end selector, along the line detent rack to select the line which will terminate the page. Carried behind the face of the scale by the page end selector is a magnet. Mounted on the track position indicator which indicates the track on the card which is being written onto, or read from, is a reed switch. When the track position indicator arrives at the last line position selected by the operator, the reed switch makes and a signal is generated, amplified and applied to the line control logic of the system. The line control logic causes the system to enter into a line mode in which further print out, if desired, is line-by-line under operator control.

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