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Compensating Logic

IP.com Disclosure Number: IPCOM000095615D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

DiStefano, EJ: AUTHOR

Abstract

In a serial card reader, this logic compensates for variations between fixed data indices and the movement of individual cards.

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Compensating Logic

In a serial card reader, this logic compensates for variations between fixed data indices and the movement of individual cards.

A card is fed from magazine 10 by card picker 11 and feed rolls 12 past multi- element data sensing station 14. Station 14 not only senses data from the card but also determines the position of the card at certain times in the feed cycle. Emitter 15 is driven in synchronism with picker 11 which, if a card moves with no slippage between it and the feed rolls and if there is no lost motion in the mechanism, provides impulses that accurately define card columns. This logic provides a limited amount of compensation when conditions adverse to those above exist.

In normal operation, the sensing of one or more data holes in each column initiates a strobe pulse which serves to gate And's 16 to enter the sensed data into storage registers 18. Since in coding, more than one hole is often used in a column, a delay is introduced in the strobe circuit following the sensing of the first hole to compensate for card misalignment.

In some instances columns are left blank. Here, emitter 15 is used to initiate the strobe pulse. This, however, can cause erroneous data sensing when the card movement is not synchronized with the emitter. To compensate for this condition, the emitter 15 pulses are delayed or partially suppressed after determining the card position in relation to the emitter position. The arrival of the leading edge of the ca...