US1712528A

US1712528A - Printing-telegraph system

Info

Publication number: US1712528A
Application number: US200936A
Authority: US
Inventors: Burdette S Swezey
Original assignee: American Telephone and Telegraph Co Inc
Current assignee: AT&T Corp
Priority date: 1927-06-23
Filing date: 1927-06-23
Publication date: 1929-05-14
Anticipated expiration: 1946-05-14

Description

May 14, 1929. B; s. SWE-EY 1,712,528

ERINTING TELEGRAPH SYSTEMl Filed (June 23, 1927 @gm-*f1 rammed `May 14, 1929.

l1,112,528 PATENT OFFICE.

BURDETTE S. SWEZEY, F BAYSIDE, NEW YORK, ASSIGNOR TO AMERICAN TELEPHONE AND TELEGBAPH GOMPANYA CORIfORA'lION 0F NEW YORK.

Application tiled June 23,

` 1o or the normally closed type of transmissionl line is used. It is to systems in which the line is normally closed that the present invention is especially adapted, and in methods heretofore used in connection with .15 systems of this type, particularly those designed for light traffic in which the motors connected to the line may be idle for a considerable. .part of the time, the motors were started and stopped by opening-and closing the 'line at a distant station, the actual starting or stopping notb'eing effected until the line was closed atthe end of an open interval. In order to differentiate between intervals required for starting and stopping, the intervals forstarting were of a predetermined duration and the intervals for stopping were of longer duration.

Accordin to the present invention" the startincr an vthe stopping of the motors are 3Q, 'effected during .the open vintervals of the line. Any opening of the line, regardless of its duration, will cause the motors to start, and if the opening is'"prolonged for a' predetermined period the motors will automatically stop and cause all sources of current supply at the various stations connected. to the line, to be disconnectedV from their respectively associated apparatus.

A preferred embodiment of the present 4o invention is set forth in the following description and the appended claims and theinvention may be more lreadily understood when the description is taken in conjunction with the accompanying drawing. A

The invention is shown inl the drawing as embodied in a printing telegraph system ,comprising a plurality of stations connected in serial vrelation with only that 'equipment necessary for a clear understanding of the invention. The serial relation provides for a plurality of stations being adapted to simultaneously receive from any one'of the stations information such as news bulletins, stock quotations or any other news of. general interest to those engaged in a particular 1927. serial No. 200,936.

business. Each station may be equipped with' transmitting apparatus so that messages, or news, may be transmitted from any station to the other stations in the system, the `motors at the other stations being under control of the operator at the transmitting station.

Referring now to the drawing there are shown two printing telegraph stations A and B connected through to a'series of stations included in the inclosure designated C, having a line battery provided at any-one of the stations. The equipments shown at stations A and B are' identical and representative of the equipments provided at the other stations included in inclosure C. A description of the equipment at station `A will therefore suiice for a clear understanding of the equipments .at the other stations.

Assuming for the purpose of illustration that the operator at station B desires to send news items out over the system, a start signal is.sent over the line 2 by actuating a non-locking key l, and the line circuit, which extends through all the stations in the system, battery 3 being furnished at one of the stations 'in enclosure C, is opened momentarily. The opening effected in the 'line circuit when the start signal is transmitted, is somewhat longer than the open periods ordinarily effected by message, or

news, signals.l The opening of the line circuit causes a deener ization of the normally operatedV line re ays located respectively at the various stations yand these relays upon releasing, operate the station equipment to start the motors. Line relay 4 at station A upon operating, opens a circuit extending from battery, armature and front contact ofrelay 4:', through the windings of printer magnet 5 and slow release relay 6 in series,- to ground. The slow release relay which is normally operated does. not release in response to this momentary opening of the line and therefore aids at Iits normally engaged armature` and contact in effecting .the operation of a control relay 7 when the line relay 4 releases. -The operating circuit for relay 7 may be traced from battery, armature and back contact of relay 4', armature and contact of relay 6', through'the winding of relay 7', to ground. Relay 7 upon operating,closes at its left armature and contact an obvious operating circuit for motor 8', and its right armature and contact a locking lbattery, right armature and contact of relai;

circuit for itself, which may be traced from".

.7 armature and contact 'of relay 6 throug teristic of rela line relays at the various stations areagainoperated. At station A the normally closed circuit hereinbefore traced as extending through the windings of printer .mafrnet 5 and slow release rela 6' is conyseque'ntly closed, and the printermagnet is thus prepared for lthe reception of the message transmitted from transmitter Line relay 4fis-re onsiVelto the message impulses' and there ore during the transmission ofthe message opens/and closes in rapid succession the normally closed circuit extending through the windingsI Aof printermagn'et 5 and relay 6. Magnet 5 responds to the operations'of relay 4 and thereby records the message impulses incomin lfrom the central station, but relay 6 -lielng of the slow-release type does not 'respond', thus maintaining the locking circuitagain actuated, but this time fora longerv for relay 7 closed during transmission.

` At the completionlof the message, key 1" period than that .for the startsignal, to

, openthe'line circuit and cause the release the `line relay. At station A thecircuit extending through vthe windings of printer magnet 5. and slovi7 release relay 6 is opened and maintainedthus for a period of sufficient duration to effect the release Iof relay 6. Thel relase of relay 6 vopensboth.

the operating and the locking circuit for relay 7 and the latter relay releases thereby stopping motor 8.

' In this manner, the transmitting station may control in a simple,cconomic and Iefiicient manner the motors at, the other stations connected to l of the motors is effected as soon as the line 1s opened and if the open period is pro- -longed the motors will automatically come to a stop, thereby providing a system in which the motors arerestored vto normal condition should the line be broken by-any extraneous cause such :is-lightning, wind orany other such element.

Itis understood that the-'invention may be .adapted toa power system, in general',

-in which a normally energized line interconnects a, plurality of stations having motors arranged to 4start and stop by remote interconnecting a ve line. The starting control methods. It is also understood that i instead of vemploying a metallic circuit for ground return circuit may be used, in which event grounded line vbattery will be furnished at each of the terminal stations, -having the positive pole of one `battery connected to one end of the line circuit and the negative pole of the other line battery con` nected to the other end of theline circuit. The invention may also be adapted to radial systems in which a plurality of stations are interconnected through-a central station b acontinuous metallic clrcuit, or 1n whicl fthe plurality of stations are connected in parallel to the central station by a ground return circuit, the latter circuit providing an .arrangement in which the central station is the only one capable of h olding direct communications with the other stations.

" What is claimed is:

1. Acommunication system com rising a normally closed line, a plurality o stations. lconnected to said line, a signal receiving set anda motor therefor at one of said stat1ons,

means at the other of said stations for opening and closing said line, and means at the first of said .stations responsive when said line is opened to effect the operation of said motory and further responsive when said line is maintained o cned for a redetermincd period toieffect t ie stopping o said motor.

2. A communication system comprising a normally closed line, a plurality'of stations connected tosaid line, a receiving set and a motor therefor at each of saidA stations, means at one of said stations for opening and closing said line, and'electromagnetic means at each of the other said stations responsive when said line is opened to effect the operation of said motors and further re-` sponsive when said lineA is` maintained opened for a predetermined period to effect the stopping of said motors.

3. In 'a communication system, a normally closed line, a plurality of stations connected to said lineLa receiving and a transmitting set and a motor therefor at cach of said stations, switching means at one of said sta- Ations for'opening and closing said line, and electromagnetic means at cach of the other said stations responsive when said line is opened to effect t ie operation of said motors and further responsive when said line is maintained open for a predetermined period to effect the stopping of said motors.

4. In a ltelegraph system, a line, a lu- 'rality of stations connected to said ine, means at each of said stations for openin and closing said line, a receiving set at eac of said stations comprising a printer anda motor therefor, a relay for controlling the plurality of stations a.

operation of said motor, a line rela responsive to said openings and arrange to operdisconnection between said motor and said power source during the open intervals.

6. In a telegraph system, a line, a line relay, a motor'and a power source there# for, means` responsive to an opening of said line to connect said motor to said power source, and means responsive to those open periodsonly which exceed a predetermined length, said 4first mentioned means being under the control of said last mentioned means, said last mentioned means causing said first mentioned means to disconnect said motor from said power source.

7. In a telegraph system, a normal-ly closed line, a plurality of stations connected to said line1 meansat one of said stations for opening said line for different periods,

a motor and a power source therefor at each of said'stations, and means at each of said stations selectively responsive to said line openings, said means comprising a line relay, a slow-release relay and a controlrelay, said relays 'coacting to effect the connection and disconnection between the associatedv motor and periods.

8. In a telegraph system, a normally closed line, a plurality of stations connected to said line, means at one of said stations for opening and closing said line, a motor and a power source therefor at each of said stations, means at each of said stations responsive to an opening of said line to connect its associated motor to its power source, and other means at cach of said stationsresponsive to those openings only which eX- ceed a predetermined period, said second mentioned means being under control of said last mentioned means, said last mentioned means causing said first mentioned means to disconnect its 4associated motor from its power source.

9. In combination, a line conductor, cir cuit breaking means for opening said conductor, land a rotary dynamo-electric inachine, mechanism controlled by said circuit breaking means to start the rotation of said dynamo-electric machine during the open state ofsaid line, and devices controlled by said circuit breaking means to stop said dynamo-electric machine, said mechanism and devices being associated with said line and dynamo-electric machine by means selective in accordance with the time duration of the opening of said.V line to determine whether said machine is stopped. or started.

In testimony whereof, I have signed my named to this specification this 22nd-day of June, '1927.

Buanrfrrn s. swEzEY.

power -source during the open