Browse Prior Art Database

Machine Control

IP.com Disclosure Number: IPCOM000074968D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Cote, E: AUTHOR [+5]

Abstract

The IBM Magnetic Tape/SELECTRIC Typewriter provides an excellent system for controlling an external load such as a display, a machine tool, etc. The control system, as shown utilizes three basic elements: a Magnetic Tape/SELECTRIC Typewriter 10, an extender 11, and a switching network 12. As is well-known the Magnetic Tape/SELECTRIC Typewriter functions to input and store a control program while providing sequential output instructions. This function is accomplished by utilizing the 8 single-bit codes of the MT/ST, which codes are 2, 5, revised carrier return, close bracket, T, exclamation mark, z, and Z. These codes are inputted to the MT/ST by the typewriter and are stored incrementally on either of the two magnetic tape cartridges.

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Machine Control

The IBM Magnetic Tape/SELECTRIC Typewriter provides an excellent system for controlling an external load such as a display, a machine tool, etc. The control system, as shown utilizes three basic elements: a Magnetic Tape/SELECTRIC Typewriter 10, an extender 11, and a switching network 12. As is well-known the Magnetic Tape/SELECTRIC Typewriter functions to input and store a control program while providing sequential output instructions. This function is accomplished by utilizing the 8 single-bit codes of the MT/ST, which codes are 2, 5, revised carrier return, close bracket, T, exclamation mark, z, and
Z. These codes are inputted to the MT/ST by the typewriter and are stored incrementally on either of the two magnetic tape cartridges. The MT/ST is then capable of reading incrementally the stored programming, the output being a 48 volt pulse from the bit relays.

By attaching an extender 11 to the MT/ST the 8-bit output may be expanded to any multiple of 7 bits and one progressive control bit. Functionally this may be accomplished by an 8-position wire contact relay utilizing, for example, an SCR latching circuit. The 7 control bit pulses are programmed through the normally closed contacts of the relay and then the 8th bit (control bit) may be pulsed to fire a SCR which energizes the relay to close the normally open contacts, thereby permitting all 8 bits to progress to the normally closed contacts of the subsequent or next adjacent relay. The relay...