Real time control system for processing main and incremental quantities

• US 3,197,621 A
• Filed: 12/30/1960
• Issued: 07/27/1965
• Est. Priority Date: 12/30/1960
• Status: Expired due to Term

• Current Assignee: Robert J. Urquhart
• Original Assignee: Robert J. Urquhart
• Inventors: Urquhart, Robert J.
• Application Number:
  US04/079,869
• Time in Patent Office: 1,670 Days
• US Class Current: 708/494
• CPC Class Codes: G06F 13/22 using successive scanning, e.g. polling G06F13/24 takes precedence
• CPC Class Codes: G06F 15/78 comprising a single central processing unit

Claims

6. IN A REAL-TIME PROCESS CONTROL SYSTEM WHEREIN A DIGITAL COMPUTER INTERMITTENTLY GENERATES A MAIN CONTROL QUANTITY AND AN INCREMENTAL QUANITY REPRESENTING THE DESIRED CHANGE IN SAID MAIN CONTROL QUANTITY DURING A TIME INTERVAL, BUFFER APPARATUS FOR CONVERTING THE MAIN CONTROL QUANTITY AND THE INCREMENTAL QUANTITY INTO A SEQUENCE OF SIGNALS AT TIME INTERVALS FOR CONTROLLING AN OUTPUT DEVICE COMPRISING A ROTATABLE MAGNETIC DRUM HAVING THREE SEPARATE TRACKS ABOUT TH EPERIPHERY THEREOF, RAD AND WRITE MEANS ASSOCIATED WITH EACH OF SAID TRACKS A DIGITAL COMPUTER HAVING AN ACCUMULATOR, MEANS INTERCONNECTING SAID ACCUMULATOR WITHT HE WRITE MEANS FOR A FIRST OF SAID TRACKS FOR TRANSFERRING AN INCREMENTAL TITY FROM SAID ACCUMUALTOR TO SAID FIRST TRACK, MEANS INTERCONNECTING SAID ACCUMULATOR WITH THE WRITE MEANS OF A SECOND OF SAID TRACKS FOR TRANSFERRING AN INCREMENTAL QUANTITY FROM SAID ACCUMULATOR TO SAID SECOND TRACK, AN ADDER-SUBTRACTOR, CIRCUIT MEANS CONNECTING THE READ HEADS FOR SAID FIRST AND SECOND TRACKS WITH SAID ADDER-SUBTRACTOR TO MODIFY THE MAIN CONTROL QUANTITY RECORDED ON SAID FIRST TRACK WITH SAID INCREMENTAL QUANTITY EACH REVOLUTION OF SAID MAGNETIC DRUM, SAID ADDER-SUBTRACTOR HAVING AN OUTPUT CONDUCTOR, MEANS INTERCONNECTING SAID OUTPUT CONDUCTOR WITH THE WRITE HEAD FOR SAID THIRD TRACK TO RECORD THE MODIFIED MAIN CONTROL QUANTITY ON SAID THIRD TRACK, MEANS INTERCONNECTING THE READ HEAD OF SAID THIRD TRACK WITH SAID WRITE HEAD FOR SAID FIRST TRACK TO RECORD THE MODIFIED MAIN CONTROL QUANTITY ON SAID FIRST TRACK IN PLACE OF THE MAIN CONTROL QUANTITY PREVIOUSLY RECORDED THEREON, AN OUTPUT DEVICE, AND GATING MEANS INTERCONNECTING SAID OUTPUT CONDUCTOR OF SAID ADDER-SUBTRACTOR AND SAID OUTPUT DEVICE, SAID OUTPUT DEVICE BEING CONTROLLED BY SAID MODIFIED MAIN CONTROL QUANTITY ON SAID OUTPUT CONDUCTOR.