Browse Prior Art Database

Tab Sensing and Carrier Return Stops for a Printer

IP.com Disclosure Number: IPCOM000093083D
Original Publication Date: 1967-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Smith, WL: AUTHOR

Abstract

This method controls the speed of operation of a print stick carrier between 40 inches per second and 10 inches per second. When approaching a tab, or print stick carrier return operation, the carrier speed must be shifted from 40 ips to 10 ips approximately one-half inch before the stop position. In cases where the spacing of a tab or carriage return is less than one-half an inch, the operation is performed at 10 ips.

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Tab Sensing and Carrier Return Stops for a Printer

This method controls the speed of operation of a print stick carrier between 40 inches per second and 10 inches per second. When approaching a tab, or print stick carrier return operation, the carrier speed must be shifted from 40 ips to 10 ips approximately one-half inch before the stop position. In cases where the spacing of a tab or carriage return is less than one-half an inch, the operation is performed at 10 ips.

Print stick carrier 10 in A bears sensor assembly 11 provided with sensor units 12, 13, and 14. Sensors 13 and 14 are spaced .100" apart. This is equivalent to the spacing between characters. Sensor 12 is spaced .400" from sensor 13. Tab units 15, made of ferrous material, are provided with an extended tab portion 16 and are mounted on rod 17. Tab units 15 are rotated between a tab set position as shown by the tab unit at the left and a tab clear position as shown by the adjacent tab by devices not shown.

When a sensor passes a tab unit 15 in the set position, an output is generated. A tab operation circuit in B employs two 2-position binary counters which are reset to zero at the start of each line of print. An output from sensor 12 advances counter 1. An output from sensor 13 advances counter 2. If a comparison does not exist between counters 1 and 2, one or more tab stops are set between sensors 12 and 13. When a tab is called for, if the counters compare, carrier 10 is started at 40 ips by Tab...