Browse Prior Art Database

Skip Control of Bank Columns

IP.com Disclosure Number: IPCOM000077004D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Battistoni, R: AUTHOR [+5]

Abstract

Described is an escapement control for a stepping motor 10, for moving a punch card in a key entry device at a faster speed than when no data is to be placed in two or more sequential columns of the card.

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Skip Control of Bank Columns

Described is an escapement control for a stepping motor 10, for moving a punch card in a key entry device at a faster speed than when no data is to be placed in two or more sequential columns of the card.

The stepping motor has four windings 12, 14, 16 and 18 which are activated and deactivated in pairs 12 and 16, 16 and 14, 14 and 18, and 12 and 18 to cause the motor to step and, thereby advance the punch card along in the key entry device. The energization and deenergization of the coils 12 - 18 is under the control of drivers 20 which, in turn, are operated by motor control logic 22. When data is being entered into the card, punch logic signals direct the motor control logic to step the motor along at a rate which is slower than required if no data is to be entered into the card. The logic provided here detects the occurrence of blank columns of data to be punched on the card and causes the motor control logic to step the motor at a faster rate.

The outskip latch 24 is turned on just prior to the data section of the particular column of data to be punched, while the look-ahead scan latch 26 is turned on during the next column of data to be punched and remains on through the next column of data to be punched. The outskip latch 24 is then turned off by any data bit in the column being scanned, or any data bit in the column occurring immediately after the column being scanned. If the outskip latch 24 has not been turned off by data oc...