US1245894A - Telegraphic receiving system. - Google Patents

Description

J. M. FELL. TELEGRAPHIC RECEI VING SYSTEM.

APPLICATION FILED JULY 8,19l6.

Patented N 0V. 6, 1917.

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UNITED STATES PATENT ()FFICE.-

JOHN M. FELL, 0F HAGKENSA C K, NEW JERSEY, ASSIGNOR TO AMERICAN TELEPHONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW YORK.

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Specification of Letters Patent.

PatentedNov. 6, 1917.

To all *whom it may concern:

Be it known that I, JOHN M. FELL residing at Hackensack, in the county of lZergen and State of New Jersey, have invented certain Improvements in Telegraphic Receiving Systems, of which the following is a specification.

This invention relates to telegraph systems and especially to means for receiving signals. Its principal objects are to provide an organization in which-the time of travel of the armatures of the receivin apparatus between their contact stops w1l be reduced and the firmness of contact with the engaged stops increased, thus improving the quality of the signals.

One arrangement for carrying out the mvention is illustrated diagrammatically in the accompanying drawing.

My invention will be described in connection with a polarized relay adapted for use in a differential duplex telegraph system, the more essential portlons of this apparatus being indicated at R. It is to be understood, however, that other t pes and forms of relay may be employed. he' main windings 10 carried by cores 11 are shown as connected in an operating circuit, of whi h 12 may be the main conductor leading to a distant station, 13 that of the artificial line of a duplex system, and 14 the common conductor connected to the contact of a pole changer, this artificial line, pole changer and relay being at the receiving station and arranged in the usual manner. The relay magnets are preferably polarized by a winding 15 upon a core 16 and supplied with current from a battery 17 The armature 18 of the relay,

playing between contacts 19 and 20, is joined through a relatively high resistance 21 with the grounded winding of a signal receiving apparatus R, which may be a polarized sounder. The contacts 19 and 20 are united to grounded batteries '23 and 23, respectively. Upon the cores 11 is an auxiliary winding 24 independent of the main and polarizing windings. One terminal of this auxiliary winding is joined to the relay armature, while the other terminal is connected to ground'through a resistance 25 and condenser 26, and preferably through the winding of sounder R.v

Such'a signaling current arriving over the line that the armature 18 is moved against the stop 19,. the condenser 26 is charged from battery 23,, causing an impulse to flow from said battery through resistance 27, contact 19, armature 18, conductor 28, auxiliaryf winding 24, conductor 29, resistance 25, condenser 26 and the winding of sounder R. The auxiliary winding is so connected that the impulse, continuing until the condenser is fully charged, acts to hold the armature v against the contact while the operating current is building up toward its maximum. The magnetization thus imparted to the cores 11, 11 resists the tendency of the armature to chatter upon the contact and thereby produce false signals, a condition often caused by induced or earth currents. When upon a reversal of the linecurrent the armature 18 leaves contact19, the condenserdis: charges through the winding 24 and sounder R, giving an impulse opposite to that occurring when the condenser was charged. The effect of the magnetization of the cores 11, 11 is now such as to aid the operating current to move'the armature, this coming at a time when said current is weakest. Upon reaching the contact 20 battery 23! charges the condenser through resistance 30, contact 20 and the path first traced, with a succeeding discharge, resulting in a similar retaining and accelerating actionof the auxiliary circuit upon the armature as that just described. By varying the capacity of the condenser 26 and the magnitude of the ,resistance 25, the value of current in the auxiliary winding may be changed to control its efiect. A suitable resistance has been found in practice to be 8000 ohms, while the capacity of theecondenser' maybe 2 microfara-ds. A resistance of about ten thousand ohms may be used at'21.

It should be further noted that as the charge and discharge of the condenser passes through the windmg of the sounder R,

which constitutes. another element of the'resaid circuit being controlled by the receiv- Q R I I neeasee in'g apparatus, and means for causing a eeto contacts of the relay, means for deliver rent impulse through the receivingapparain an energizing pulse tothe relay upon tus and said device when the continuity of initiai change of engagement betweengits the last-named circuitis altered. a armature and a contact, andital receiving 2. In a telegraphreceiving systern, an opapparatus included. in. the pat of said en: 35

10 second-named winding, a signal-receiving 'gizing circ 't for the relay independent 01? crating circuit, a relay having a mam windergizing mfulse. r ing and an auxiliary windlng, the main 5. egraph receiving system, an opwinding being connected in the operati'n crating circuit connecting stations, a relay circuit, an auxiliary circuit including sai having its-winding in said circuit, an enerdevice and a source of current controlled iby. the operating circ 't including a con contacts of the relay, and means fordehv- 1 denser, and a signal receiving apparatus i n erin a current impulse to the auxiliary eluded infid energizing circuit,

win ing upon initial change of engagement [6; In a telegraph reeeivm'g sy in a S.

ls'between the relay armature and a contact. 'erat circuit, a relay havin main win 3. In a telegraph receiving system, an opin andf an auxiliary Winn themain crating circuit, a-relay having a main windwing being-connected in t e operating ing and an auxiliary winding, the main ,,circuit,'.anenergizing circuit for'the relay. winding being connected in t e operating including a source Qoffcurrenhacontact of 2c circuit, and an energizing circuit for the the relaycits auxiliary windingand acon 5 relay including; asource of current,- a con- 1 denser, and a sounder having its windingv a included-in said energizing circuit.

tact of the relay, its auxiliary winding a c condenser for delivering a current imnuije in testony whereof, ,li havesigried my a to said auxiliary winding upon initiai change name tothis specification in the presence of 25 of engagement between the relay armature two subscribing witnesses, this'first day of 55.

and a contact, and a signal-receiving device July, 1921.6. controlled by said relay. c

JQHN it. t an Y tin a telegraph reeeivingsyste, anopQ Witnesses: r erating circuit, a relay having its winding Enwr F. Werson,

so in said circuit, a source. of current connected B; l men Hermann.

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