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Letter Lockout Circuit

IP.com Disclosure Number: IPCOM000096358D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Abstract

The circuit insures privacy in a multiple station dictating system Microphones 1 and 2 are at remote stations 3 and 4. Each microphone has control buttons such as a Letter punch-Secretary punch button 5 and a Record-Listen-Review button 6 on microphone 1. Only one of the remote stations 3 or 4 is selectively connected to the central dictating and transcribing station 7 at a time through the selection and control circuits 8. The central dictating and transcribing station 7 has a receptacle 9 in which an index slip 10 is placed.

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Letter Lockout Circuit

The circuit insures privacy in a multiple station dictating system Microphones 1 and 2 are at remote stations 3 and 4.

Each microphone has control buttons such as a Letter punch-Secretary punch button 5 and a Record-Listen-Review button 6 on microphone 1. Only one of the remote stations 3 or 4 is selectively connected to the central dictating and transcribing station 7 at a time through the selection and control circuits 8. The central dictating and transcribing station 7 has a receptacle 9 in which an index slip 10 is placed.

As each dictator at a remote station 3 or 4 finishes dictation, an end of letter solenoid 11 is actuated in order to punch end of letter perforations in the index slip 10, as at 12 and 13. When an end of letter perforation, such as perforation 13, is produced, a DC potential is also fed through diode 14 to energize relay 15. Energization of relay 15 results in transfer of the contacts associated with it indicated by the dashed line 16. Relay 15 holds through its own contacts 17 and 18 and the contacts 19 and 20 of relay 21. The potential for maintaining relay 15 energized is obtained from terminal 22. The same potential is supplied through diode 23 to actuate clutch 24 for causing the feed mechanism in the central dictating and transcribing station to move forward.

When feed has continued sufficiently so that sensing contact 25 drops into the end of letter perforation just punched, a circuit is then completed by line...