US1541356A - Message-register system - Google Patents

Message-register system Download PDF

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US1541356A
US1541356A US602948A US60294822A US1541356A US 1541356 A US1541356 A US 1541356A US 602948 A US602948 A US 602948A US 60294822 A US60294822 A US 60294822A US 1541356 A US1541356 A US 1541356A
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relay
hand
contact
circuit
switch
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US602948A
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Frank S Irvine
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AT&T Corp
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Western Electric Co Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q3/00Selecting arrangements
    • H04Q3/42Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

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  • FRANK s FRANK s; IRVINE, ornun'rineron, NEW. YORK.
  • This invention relates to message register systems for telephonev exchanges and more particularly to message register systems for use in telephone exchanges employing party line-working wherein each of the stationsot' the party line is provided at the central .of- .fice with a message register for registering calls.
  • An object of the invention is to provide an improved circuit arrangement for use in systems of this nature for selectively associating with the calling station of a party line the message register individual thereto and for subsequently operating said register.
  • Another object of the invention is an inn proved arrangement for pieventing the re istration of calls upon the party lines whio are in an unstandard' condition.
  • each station of the party line is provided with a certain test condition and the first selector ing which station of the party line is'calling.
  • the testing means controls the actuation of I the nduction coil when the receiver ed the a switching device associated withlthe calling line, which in turn controls the inclusion of the message register correspondingto the I .iground to the tip conductor of .the 11118 The substation on callingdine in the message register circuit.
  • Fig. 1- shows one of agroup of two-party lines for use in a full mechanical office.
  • Figs. 2, 3 and 5, whenv taken togethen show the circuits of a line finder having access to the subscribers line shown in Fig. 1-, .the circuits of a dis trict selector switch, a sender tinder and so much oi'an office sender as is necessary for an understanding of the invention;
  • Fig. 4 in
  • the calling line terminates in a line finder switch of the well-known power driven paneltype.
  • the brushes of the line finder are connected to the circuit of a district selector switch.
  • a message register Associated with each of the substations A and B, connected to the calling line, is a message register.
  • a cut-0d re lay Associated with the calling line is a cut-0d re lay, which controls the extension of a common operating circuit extending through a .hrush of the-line finder switch to the message registers.
  • incoming selector ice and final selector switches shown in Figs. 3 and 4 are of the general t pe shown and described in the patent to raft and Reynolds, 1,123,696, issued January 5, 1915.
  • Each of. these switches has a vertically dis posed switch shaft provided with five sets of brushes, each brush set having access to a bank of one-hundred terminals.
  • an updrive magnet is provided, which, when energized, presses the switch shaft against a constant- 1 rotating power drum, and for restoring the switch shaft to normal position, a downdrive magnet is provided, which, when energized, presses the switch shaft against a second constantly driven drum.
  • a tripping spindle is provided as described in the patent hereinbefore referred to.
  • the circuits of the incoming selectorswitch and the final selector switch may be of the type described in the patent to D. M. Taggart, et al., hereinabove mentioned.
  • the steering switch RS shown in Fig. 2, and the sender finder switch FS, shown in Fig. 3, are of the well-known step-by-step type, the wipers of which are advanced by a stepping magnet.
  • the switch RS functions during a complete half revolution and upon the termination of a connection left with its wipers in normal condition for serving on a new call.
  • the wipers of finder switch FS have no normal" contacts, the wipers resting in contact with the bank ter minals last employed by the switch when the switch is not being employed.
  • auxiliary switches are provided for controlling the circuits associated withthe several selector switches and the circuits of the ofiice sender. These switches may be of the type described in the patent to Reynolds, et al., 1,127,808, issued February 9, 1915, and known in the art as sequence switches.
  • Each sequence switch comprises a rotatable shaft driven from a constantly operating source of power through a magnetic clutch member and carries a plurality of circuit closing cams which at difierent radial ositions of the shaft, cause the closure 0 a plurality of contacts.
  • cam contacts associated with each sequence switch are closed only in the positions indicated by the numerals, with the exception of the master contacts 301, 401 and 551 associated, respectively, with the switches 300, 400 and 550, these latter contacts being opened in positions indicated by the numerals appearing adjacent such contacts and closed in all other positions.
  • the line relay 102 becomes energized in this circuit and completes a circuit for the group relay 104, common to all lines in the A sub-- group of this particular brush group, to ground at the inner armature and contact of relay 102.
  • Relay 104 becomes energized and completes a circuit from ground through its armature and contact, contact and armature of relay 105, left-hand armature and back contact of relay 106 and lefthand winding of relay 107 to grounded battery.
  • Relay 107 operates in this circuit and in attracting its right-hand armature completes a locking circuit for itself and an energizing circuit for relay 218, said circuit extending over a path including grounded battery, winding of relay 218, conductor 124, right-hand armature, front contact and right-hand winding of relay 107 to ground.
  • Relay 107 in attracting its outer left-hand armature completes an obvious circuit for operating the tripping magnet 213.
  • Triplng magnet 213 rotates its tripping spin (lo 212. The tripping spindle in its rotated position prepares for the tripping of the set of brushes on the particular finder switch that is started in operation to find the calling line.
  • Relay 299 in operating, locks over a path including grounded battery, rigl'it-hand winding, front contact and inner left-hand armature and left-hand winding of relay 299, and ground at the back contact and armature of relay 214.
  • Relay 299 in attracting its outer lett-hand armature completes a circuit for the updrive power magnet 216 over a path including segment 295 tact 287 is momentarily closed and a circuit is established from ground over said contact, conductor 1525, inner left-hand armature and front contact of relay 107 and the winding of relay 106 to grounded battery.
  • Relay 1.06 attracts its armatures and locks in a circuit including battery, windin front contact and left-hand armature of relay 106. armature and back contact of relay 105 and ground at the contacts of relay 104.
  • Relay 106, in attracting its right-hand armature closes a circuit for the right-hand winding of relay 105.
  • Relay 299 in attracting its outer left-hand arn'iature also completes a circuit for relay 325, said circuit including ground at brush segment 205, front contact and outer left-hand armature of relay 299, inner righthand armature and. back contact oi relay 296, and grounded battery at the left-hand winding of relay 232,5. Relay operates in.
  • Relay 2%. in operating. completes a circuit. for the energization of relay 2028, said circuit inrluiiling grounded battery, right-hand winding of relay 2295 and ground at the inner left-hand contacts of relay 290.
  • Relay 208, in operating, locks over a path including ground through the contacts of relay 218, left-hand contact and winding of relay 298 and grounded battery at the left-hand contacts of relay 398.
  • Relay'296 in operating also completes a circuit for the energization of relay 292 and the stepping magnet 303 of the switch F S, said circuit extending from ground, through the lower left-hand contact of se uence switch spring 389 (Ll-1 A), outer rig it-hand con tacts of relay 296, inner right-hand alternate contacts of relay 825 and thence in parallel, one path extending through the contacts and winding of stepping magnet 303 to grounded battery and the other path extending through the right-hand Winding of relay 292 to grounded battery.
  • se uence switch spring 389 Ll-1 A
  • sequence switch spring 314 LI-10 A
  • relay 214 When the brush shaftof the line finder arrives at the terminal of the calling line, relay 214 operates over a path extending from ground, through the outer right-hand contacts oi relay 270, winding of relay 21%, upper left-hand contact of sequence switch spring 380 (1 lower right-hand contact of said spring (1), brush 207, contact 203, outer right-hand alternate contacts of relay 102 and left-hand winding of relay 105 to grounded battery.
  • the locking circuit for relay 299 is opened whereupon said relay releases and opens at its outer left-hand contacts the circuit for the updrive magnet 216 whereulion the upward movement of the brushes is stopped.
  • Relay 308 then operates over a path extending from grounded fixturery. tin-(nigh the left-hand normal contacts of relay 2T0, left-hand alternate contacts of relay 1500. upper right-hand Contact of se quence switch spring 2301 (1+15), winding of relay 398. outer left-hand contacts of relay 296. outer right-hand normal contacts oi? rcla-y 129$), segment 284: and brush 281 to ground.
  • the relay 39a in operating, completes a circuit for the energization of the cut-off relay 10 1 of the calling line, said circuit extending over path from ground thrijiugh the winding of relay 103, contact ⁇ V hen the brush 202, brush 206, resistance 388 and left-hand alternate contacts of relay 398 to grounded battery.
  • Relay 103 in operating, disconnects the line relay 102 from the calling line.
  • stepping magnet 303 associated with the switch FS, is energized as previouslyvdescribed and relay 325 is locked up to ground at a busy contact of switch FS provided wiper 391 of the switch FS is resting on the contacts of a busy sender. So long, however, as the test wiper 391 of the switch FS encounters contacts upon which busy ground potential exists, the stepping magnet 303 will advance the wipers of the switch until an idle sender is found, when the wiper 391 will find no ground on the contacts of the idle sender and the relay 325 will thereupon become deenergized.
  • Relay 325 in retracting its inner right-hand armature, opens the circuit previously traced for relay 292 and stepping magnet 303, and in retracting its inner left-hand armature opens the circuit for relay 394, whereupon said relays 292 and 394 release.
  • relay 292 releases, a circuit for operating relay 365 is com pleted over a path extending from grounded battery, through the right and left-hand windings of relay 365, lower right and lefthand contacts of sequence switch spring 305 (1), inner right-hand contacts of relay 398, right-hand contacts of relay 292, segment 295 and brush 282 to ground. If the sequence switch 300 remains in position 1 longer than a certain interval, an alarm signal is actuated.
  • Relay 327 also operates over a circuit extending from grounded battery, through the right-hand winding of relay 327, upper left-hand contact-of sequence switch 304 (1), upper right-hand contact of sequence switch contact 305 (1+9), lower left-hand contact of said spring (1), inner right-hand contacts of relay 398, right-hand contacts of relay 292, segment 295 and brush 282 to ground.
  • Sequence switch magnet 300 then operates over a path extending from grounded battery, through winding of magnet 300, lower righthand contacts of sequence switch spring 306 (1), front contact and outer right-hand armature of relay 327 and upper right-hand contar t of sequence switch spring 307 (1+5) to ground. driving sequence switch 300 from position 1 into position 2.
  • sequence switch 300 moves out of position 1, the circuits for relays 327 and 365 are opened and these relays release. If, at the time relay is energized, the wipers of switch FS are standing upon contacts which are connected to circuits extending to an idle ofiice sender, relay 325 does not lock up over the Circuit previously traced and the circuit previously traced through stepping magnet 303 is immediately opened at the inner righthand armature and front contact of relay menses 325a prevent the advance of the wipers of the switch FS.
  • relay 325 In position 2 of sequence switch 300, relay 325 operates over a path including a grounded battery and ground at the lower right-hand contacts of spring 308 (2+13). Relay 39 1 then operates over' an obvious circuit. With the sequence switch 300 in position 2, relay 510, associated with the selected ofiice sender, is operated over a path extending from grounded battery, through the right-hand winding of relay 510, wiper 391 of the switch FS, outer right-hand contacts of relay 325 and lower right-hand contacts of spring 308 (2+13), to ground.
  • Relay 510 energizes in this circuit and causes the advancement of the time measuring switch, not shown, associated with the ofiice sender in the manner fully set forth in the patent of Stearn and Scudder, hereinhefore re ferred to, which time measuring switch upon leaving normal position closes the off-non mal contact 511.
  • the test contact upon which wiper 391 is now resting is marked with a busy ground potential over a circuit which may be traced from off-normal contact 511, through the left-hand winding of differential relay 510, and thence to the wiper 391, whereby the sender is marked as busy until the office sender has been restored to normal condition either following the abandonment of the call or the termination of the functioning of the office sender.
  • an impulsing circuit is now established from the conductors of the calling line through the winding of the sender pulsing relay for enabling the calling subscriber to set the registers (not shown) associated with the sender in accordance with the designation of the desired line.
  • This circuit may be traced from ground, through the armature and front contact of relay 510, conductor 513, contact 386 and wiper 375 of the sender tinder FS, inner left-hand contacts of relay 394, lower right-hand contact of sequence switch spring 313 (2+9 conductor 117, inner left-hand contacts of relay 292, brush 205 and contact 201 of the switch LF, thence through the impulse contacts 130 of the calling subscribers dial S.
  • the calling subscriber now receives a dialing tone over this circuit in the manner set forth in the aforesaid patent of Steam ct al. and then proceeds to dial the number of the desired line.
  • the subscriber desires a connection with thence Ill) menace a subscribers line C which line is listed in the directory as LISpenard 9532, the subscriber proceeds to dial the three letters L I S corresponding to the designation of the ofiice in which the desired line .is located and then dials the four digits representing the number of the line, which number, as assumed, is 9532.
  • the three letters which represent the district code will cause the setting of code registers (not shown) associated with the office sender which, in turn, control the operation of the sender to control the setting of the dstrict selector switch 350 and the setting of the sequence switch of the district selector for determining the proper talking path through the repeating coil 336 associated with the district selector.
  • the transmission of the impulses corresponding to the number of the desired subscribers line 9532 causes the setting of the numerical registers associated with the sender to control the sender to govern the setting of the incoming selector switch 450 and of the final selector switch 490 for ex tending the connection to the desired line in the selected district.
  • sequence switch 550 associated with the ofiice sender is driven into position 2 in the manner set forth in the aforesaid patent of Steam, et al., for establishing a fundamental circuit extending from the office sender through the winding of relay 327 of the district selector switch for controlling the setting of the district selector. Since at this time the sequence switch 300 of the district selector is in position 2.
  • the fundamental circuit may be traced from grounded battery, through the left-hand winding of relay 327, the lower left-hand contact of sequence switch spring 310 (2), upper left-hand contact of said spring (2+5), outer left-hand contacts of relay-325, wiper 350 and contact 383 of switch FS, upper and lower contact-s of sequence switch spring 519 (2), armature and back contact of the 0 countin relay 520, the windings of the polarized relay 52-2, the windings of sender stepping relay 521 and thence to ground through the lower left-hand and right-hand contacts of se quence switch cam 523 and resistance element 524.
  • Relay 327 of the district selector switch and stepping relay 521 of the oflice sender are energized in this circuit.
  • Relay 521 upon energizing, establishes a circuit in the well-known manner for an upper counting.
  • relay of the group of counting relays associated with the sender corresponding to the setting of the code registers and relay 327 closes a circuit for driving sequence switch 300 f the district selector out of position 2 and into position 3. This circuit extends from grounded battery, through the magnet winding of sequence switch 300,
  • sequence switch 300 in position 3, the initial energizing circuit of relay 327 is opened at the lower left-hand contact of sequence switch spring 310, but relay 327 is maintained energized over the fundamental circuit by a new circuit extendin from grounded battery, through its leftand winding, its left-hand armature and front contact and thence through the lower right-hand contact of sequence switch cam 310 (1+5) and over the fundamental circuit as previously traced.
  • a circuit is now closed for the updrive magnet 338 of the district selector, which circuit extends from grounded battery, through the winding of magnet 338, the upper righthand contact of sequence switch spring 309 (3).
  • Magnet 338 upon energizing, presses the depending portion of the switch shaft (not shown) against the constantly rotating updrive drum (not shown), thereby causing the updrive movement of the switch shaft.
  • Relay 327 is maintained energized over this shunt circuit but relay 521 being shunted deenergizes causing in the well-known manner the energization of the lower counting relay corresponding to the previously energized upper counting relay.
  • the switch shaft With the district selector continued its upward movement, brush 341 poition of the. segment 342 and the shunt around the windings of sendcr stepping relay 521 is removed, whereupon the sender stepping relay again energizes. in this manner, during the upward movement of the switch shaft. the stepping relay 521 of the oflice sender is intermittently energized and dc energized causing tllGiSllCCGSSlVB energization of the counting relays associated with the sender.
  • the No. 2 counting relay was energized upon the initial energization of: sender stepping relay 521, then, when the switch shaft of the district selector has advanced to such a position as to position the third set of brushes can ried thereby in position to be tripped, the No. 0 counting relay 520 will be energized in series with the No. 0 counting relay 525 and will open the previously traced fundamental cireuit at its armature and back contact.
  • Counting relay 520 is also instrumental at this time in causing the advancement of the sender sequence switch 550 out of position 2 and into position 4; Upon leaving) position 2, all counting relays which have een energized and looked upgover the circuit extending from the sequence switch contact 526, become deenergized.
  • relay 327 becomes deenergized and closes a circuit for driving district selector sequence switch 300 out of position 3 and.
  • sequence switch 3()() opens the initial energizing circuit. of relay 327 but relay 327 is DOW maintained energized over the fundamental circuit through the lower right-hand contact of sequence switch spring 310 (1+5) and the left-hand armature; and front contact and left-hand winding of relay 327.
  • the brush 347 engages the first metallic portion of commutator segment 348 and a circuit is closed in shunt of the windings of the sender stepping relay 521, which shunt circuit may be traced from grounded battery, through the left-hand winding, left-hand armature and'front con tact of relay 327, the lower right-hand contact of sequence switch spring 310 (1+5). upper right-hand contact of said spring (4 44-5), conductor 349,5egment 348, brush 347. conductor 344. lower right-hand contact of sequence switch spring 314 (3+6). to ground.
  • Relay 327 is held energized over this circuit, but sender stepping relay 521 deenergizes, causing, upon its deencrgiza-tion, the energization of a lower counting relay corresponding to the upper counting relay whiclrwas energized upon the initial energization of relay 521. 7
  • relay 521 of the sender is intermittcntly energized and deenergized to encrgize and lock up successive lower and upper counting relays. If it be assumed that the subscriber has set the code registers in such a manner as to cause the No. 0 lower counting relay 525 to become energized upon the initial encrgization of relay 521, then upon the first deenergization of relay 521, the No. 0' counting relay 520 will become energized in series with relay 525, thereby opening the fundamental circuit and causing the advance of the sender sequence switch 550 from'position i into position 6. At this time the selected set of brushes of the district. selextor switch will be positioned upon the lowerinostset of terminals of the first group of its associated bank. Upon the advance of sequence switch 550 out of position 4. th locking circuit of counting relays. 5201 and is opened at sequence switch spring 526.
  • relay 327 becomes deenergized, opening at the front contact of its inner right-hand armature, the previously traced circuit of the up drive magnet 338 to arrest the upwardmovement of the switch shaft, and closing at the back contact of its outer right-hand armature the previously traced circuit for advancing sequence switch 300 out of position 5 and into position 6.
  • sequence switch 300 moved into position 5.
  • a circuit was established for advancing the steering switch RS from position 1 to position 2. This circuit may be traced from grounded battery. through wiper 247. contact 227 winding of stepping magnet 230, wiper 231, contact 232. conduct-or 233 and thence to ground through the upper left-hand contact of sequence switch spring 389. Stepping magnet 230 energizes in this circuit and is held encrgized until sequence switch 300 leaves posi tion 6 4 when magnet 230 deenergizes to advance the wipers of switch RS to the second position contacts.
  • ⁇ Vith sequence switch 300 in position 6 a circuit is established for relay 327 which may be traced from grounded battery through its right-hand winding, left-hand contact of sequence switch spring 304 (6+ 6 upper right-hand contact of sequence switch spring 305 (1+9), lower left-hand contact of said spring (6+7), inner righthand, contacts of relay 398, right-hand contacts of relay 292, segment 295 and brush to ground.
  • Relay 327 upon energizing, closes a circuit for driving sequence switch 300 out of position 6 and into position 7, This circuit may be traced from grounded battery, through the magnet winding of sequence switch 300, lower right-hand contact of sequence switch spring 306 ((3), outer right-hand contacts of relay 327, upper left-hand contacts of sequence switch spring 307 (6+7), right-hand alternate contacts of relay 390 and lower left-hand contact of sequence switch spring 314 (l +18 to ground.
  • sequence switch 300' leaves position (3 the initial energizing circuit of relay 327 is opened at sequence switch spring 304, but if the first. trunk in the group of trunks upon which the brushes 352 and 353 are now standing is busy, a ground potential exists on the test terminal 354 and relay 327 is maintained energized over a circuit ext-ending from grounded battery, through its left-hand winding, armature and front contact, lower left-hand contact of sequence switch spring 315 (6%+8),'lower right-hand contact of said spring (1+14), inner right-hand contacts of relay 327, righthand contacts of sequence switch spring 382 (6+7), brush 351) and terminal 35%, and when sequence switch 30! reaches position 7, a circuit is established for the updrive magnet 338.
  • updrive magnet 338 may be traced from grounded battery, through the winding of this magnet, upper right-hand contact of switch spring 309 (7), lower left-hand contacts of said spring (3+ 18), outer right-hand alternate contacts of relay 327, and upper right-hand contact of sequence switch spring 307 to ground.
  • the updrive magnet 338 upon energizing, drives the brushes upwardly in search of an idle trunk in the selected group. So long as the test brush 350 encounters the terminals of 'busy trunks, relay 327 remains locked.
  • relay 327 deenergizes as soon as the brushes have been properly centered on the bank terminals 351, 352 and Until the brushes are centered, relay 327 is maintained looked over a circuit extending through its right-hand winding, the upper right-hand contact of sequence switch spring 304 (7), segment 359, brush 36(), upper lefthand contact of sequence switch spring 309 (7), lower left-hand contact of said spring (ll-+18), outer right-hand alternate contacts of relay 327, and upper right-hand contacts of sequence switch spring 307 (G 9) to ground.
  • Relay 327 upon deenergizing, opens the circuit of updrive magnet 338, thereby arresting the brushes 351, 352 and 353 upon the terminals 355, 356 and 357 of the trunk line extending to the district of the exchange in which the desired Jun line terminates.
  • Relay 327 upon deenergizlay 365 is operated over the path previously traced, including ground at resistance 538, and grounded battery at right-hand winding of relay In position 8 of sequence switch 300, relay 327 is again operated over a circuit extending from grounded battery, through the right-hand winding of relay 327, left contact of sequence switch spring 304, upper left-hand contact of sequence switch spring 305 (1+9), upper left hand contact of said spring (84-16%), and outer right-hand contacts of relay 365 to ground.
  • Relay 327 upon energizing, closes a circuit through its outer right-hand armature and front contact for driving sequence switch 300 out of position 8 and into position This circuit extends from grounded battery, through the magnet winding of sequence switch 300, lower righthand contact of sequence switch spring 306, outer righthand contacts of relay 327 and upper righthand contact of sequence switch spring 307 to ground.
  • relay 327 is held energized over the circuit just traced until selection beyond the district selector 350 has been completed.
  • the fundamental circuit is extended from the ofiice sender through contacts of se uence switch springs 318 and 319 of the istrict selector to the line relay 421 of the incoming selector switch 450.
  • the fundamental circuit may be traced from grounded battery, through the left-hand winding of relay 421, lower contactof sequence switch spring 402 (1+10), upper contact of said spring (1), resistance 424, lower contact of spring 403 (1+10), conductor 419, terminal 355, brush 351, upper right-hand contact of spring 318 (9+14), lower left-hand contact of said spring (9), outer left-hand contacts of relay 325, wiper 350 and contact 383, upper and lower contacts of spring 519 (6), contacts of the counting relay 520, windings of relays 522 and 521, lower and upper contacts of spring 523 (6), wiper 339 and its associated contact, lower right'hand contact of spring 319 (9), upper right-hand contact of said spring (9+14), brush 352, terminal 356, conductor 420, upper contact of spring 404 (1+10), resistance 425 and lower contact of spring 405 to ground.
  • Relays 521 and 421 energize in this circuit.
  • the incoming selector switch is then set after which the final selector switch is set in its tens and units selection movements.
  • steering switch RS is in position 2
  • sequence switch 300 is in position 9
  • sequence switch 400 will be in position 8 and relay 421 of the incoming selector switch will be energized in the manner described in the Taggart et al. patent.
  • Relay 421 upon de energizing, closes a circuit for driving sequence switch 400 out of position 8 and into position 9. This circuit may be traced from tgrounded battery, through the windin 0 sequence switch magnet 400, upper le -hand contact of sequence switch spring 406 (8), and thence to ground at the inner left-hand armature and back contact of relay 421.
  • relay 421 is again connected into the fundamental circuit extending through the windings of the sender stepping relay 521 and the windings of overflow relay 522, but since at this time the winding of relay 421 is connected to the ring conductor of the fundamental circuit rather than to the tip conductor as described in the Taggart et al. application, current flowing in the fundamental circuit now flows in a direction reverse to that direction in which it originally flowed.
  • the circuit of relay 421 may be traced from grounded battery, through the left-hand winding of relay 421, lower contacts of sequence switch spring 415 (9), resistance element 425, upper contact of sequence switch spring 404 (1+10), thence over the fundamental circuit as previously traced and returning through the lower contact of sequence switch spring 403 (1+10), resistance element 424, contacts of sequence switch spring 408 (9), and thence to ground through the upper contacts of sequence switch spring 412.
  • Y the circuit of relay 421 may be traced from grounded battery, through the left-hand winding of relay 421, lower contacts of sequence switch spring 415 (9), resistance element 425, upper contact of sequence switch spring 404 (1+10), thence over the fundamental circuit as previously traced and returning through the lower contact of sequence switch spring 403 (1+10), resistance element 424, contacts of sequence switch spring 408 (9), and thence to ground through the upper contacts of sequence switch spring 412.
  • Overflow relay 522 upon energizing, establishes a circuit for the advance relay 537, which, at its armature and back contact, opens the previously traced circuit through the winding of call charging relay 365.
  • Relay 365 thereupon deenergizes opening the circuit of relay 327, which thereupon deenergizes and establishes the previously traced circuit for driving sequence switch 300 of the district selector out of position 9 and into, position 10.
  • sequence switch 300 With sequence switch 300 in position 10, a circuit is now established from grounded battery, through the lefthand winding of relay 327 of the district selector switch, lower left-hand contactof sequence switch spring 310 (10), upper lefthand contact of said spring (10+13),'front contact and outer left-hand armature of relay 325, wiper 350 and contact 383 of the sender finder FS, upper and lower contacts of sequence switch spring 519 (16),armature and back contact of the No.
  • sequence switch 300 Upon the movement of sequence switch 300 out of position 9 the impulsing circuit over which the calling subscriber set the registers of the ofiice sender is opened at contacts of sequence switch springs 312 and 313, and the talking conductors of the district selector trunk are now connected over contacts of these springs to wipers 242 and 243 of the steeringv switch RS. Sequence switch 300, upon reaching position 9%, establishes a circuit for advancing the steering switch RS from position 2 to position 3.
  • This circuit may be traced from grounded battery through the back contact and armature and winding of stepping magnet 230, wiper 231, the position 2 contact upon which it is now standing, conductor 233, and thence to ground through the upper left-hand con i the wiper 266, wiper 266, conductor 248, lower left-h and contact of sequence switch spring 380 (10), upper right-hand contact of said spring (2+18) to ground.
  • the resistance of the right-hand winding of relay 244 is so selected that if relay 249 energizes in series therewith. relay 249 will consequently energize over the line resistance of any calling subscribers line to which it may be later connected in testing for a discriminatory condition upon such subscribers line.
  • relay 252 If relay 249 energizes, a circuit is immediately closed for energizing relay 252, which circuit may be traced from grounded battery, through the right-hand winding of relay 252, .front contact. and outer left-hand armature of relay 224, "and thence to ground at the armature and front contact of relay 249.
  • Relay 252 upon energizing, establishes a circuit for advancing the steering switch out of position 3 and into position 4, this circuit extending virom grounded battery, through the back contact, armature and winding of stepping magnet 230, wiper 231, the third position contact upon which it is resting, and thence to ground at the outer right-hand armature and front contact of relay 252.
  • Relay 252 performs no other use ful function at this time. As soon as the steering switch leaves position 3, the circult of relay 249 is opened and relays 249 and 252 release.
  • test relay 249 fails to energize when connected to the right-hand winding of relay 224 upon the routine test to determine thesensitiveness of relay 249, then the steering switch remains in position 3 and relay 224 is maintained energized for a sufiicient time to connect ground through its outer left-hand armature and front contact to the circuitextending to the selector time alarm for causing the selector time alarm to operate.
  • Relay 370 upon energizing, establishes a holding circuit for the slow-to-release relay 390 extending from grounded battery through i the right-hand winding of relay 390, frontv contact and armature of relay 370, right-hand armature and alternate contact of relay 390, and thence to ground through the lower left-hand contact of sequence switch spring 314 (l 448 4
  • the above traced locking circuit holds relay 390 operated after its initial energizing. circuit through the upper left-hand contact'of sequence switch spring 314 (1+10 is opened as the sequence switch 300 is advanced beyond position 10.
  • relay 252 When relay 252 deenergizes, a circuit for moving the steering switch from position 4 to position 5 is 5. completed as follows: grounded battery, back contact, armature and'winding of magnet 230, wiper 231 and the fourth position contact with which it is associated, back contact and outer righthand armature of relay 252 to ground.
  • a circuit is established for magnet 230 extending from grounded battery, through the eighth position contact of the switch wiper 247, magnet 230, Wiper 231 and the eighth position contact upon which it is resting, conductor 233, and thence to ground through the upper left-hand contact of ,sequence switch spring 389 (9 14-10 1,).
  • the magnet is held energized over this circuit and does not advance the wipers of the steering switch from position 8 until sequence switch 300 leaves position 10 During the time that the steering switch is advancing through positions 3 to 6, inclusive, the tip conductor of the subscribers line is connected to grounded battery for the purpose of' removing any charge that may have accumulated on the line and which might later erroneously affect the testing circuit established; through the testing relay 249.
  • This circuit may be traced from conductor 116 through the lower right-hand contact of sequence switch spring 312 (9%+13 conductor 372, Wiper 242, contacts 3 to 6 over which this wiper passes, to grounded battery.
  • sequence switch spring 312 9%+13 conductor 372, Wiper 242, contacts 3 to 6 over which this wiper passes, to grounded battery.
  • the steering switch reaches position 7
  • the winding of the test relay 249 is connected to the tip conductor of the subscribers line, and if, as in the case assumed, the subscriber at substation 7: A of the calling line has initiated the call, the relay 249 will energize over a circuit? which may be traced from grounded battery, through the winding of relay 249, the seventh position contact as sociated with the wiper 242, wiper 242, con. ductor 372, lower right-hand contact of sequence switch's'pring 312 (9 44-13 4;), trunk conductor 116.
  • Relay 249 energizes in this circuit and as relay 224 is at this time deenergized, establishes a circuit for the switching relay 222 which may be traced from grounded battery, through the lefthand winding of relay 222, conductor 256, front contact and outer left-hand armature of relay 394, back contact and outer lefthand armature of relay 224, and thence to ground through'the armature and front contact of relay 249.
  • Relay 222 energizes in this circuit and establishes a locking circuit for itself extending from grounded battery, through its left-hand winding, front contact and left-hand armature, and lower left-hand contact of sequence switch spring 314 (l 4 18 4), to ground.
  • the previously traced circuit for test relay 249 is main tained through wiper 242 of the steering switch until the steering switch leaves position 8.
  • circuit is established for advancing the se-' quence switch 300 of the district selector out of position 10. This circuit may be traced from grounded battery through the magnet winding of sequence switch 300, lower righthand contact of sequence switch spring 306 10+l3), front contact and outer right-hand armature of relay 327, (the relay 327 being maintained energized at this time over the fundamental circuit extending through the sender stepping relay 521), eighth position contact upon which wiper 266 of the steering switch is now resting, wiper 266, conductor 248, lower left-hand contact of sequence switch spring 380 (10), and upper right-hand contact of said sequence switch spring (2+18) to ground.
  • Relay 327 is maintained energized in position 11 of sequence switch 300 by a circuit from grounded battery, through its left-hand winding, armature and front contact, lower right contact of spring 310, (UH-17), upper leftcontact of 310 (10+13) outer left-hand contact of relay 325 and thence to ground over the fundamental circuit.
  • the previously traced energizing circuit of stepping magnet 230 of the steering switch is opened and the magnet 230 advances the wipers of the steering switch out of position 8 and into position 9.
  • a circuit is established from grounded battery through the armature, contacts and winding of stepping magnet 230, wiper 231, to ground on the ninth position contact upon which it is resting for advancing the wipers of the steering switch over the ninth position into position 10.
  • the trunk conductors 116 and 117 are connected through the wipers 242 and 243 of the steering switch to conductors 372 and 371, and the answering supervisory relay 370 is now maintained energized over the calling subscribers loop.
  • a shunt circuit is established in shunt of the windings of the sender stepping relay 521, which may be traced from grounded battery, through the left-hand winding, left-hand armature and front contact of relay 327, lower left-hand contact of sequence switch spring 315 and to ground at the upper left-hand contact of sequence switch spring 315 (7%-
  • relay 327 upon deenergizing, opens the driving circuit of sequence switch 300 and the sequence switch is arrested upon reaching position 11.
  • relay 325 is maintained energized to maintain the fundamental circuit closed through the winding of relay 327 until it is interrupted by the No. 0 counting relay of the ofiice sender over a circuit which may be traced from grounded battery through the right-ham] winding of relay 325, upper right-hand contact of sequence switch spring 316 (104-13), front contact and right-hand armature of relay 394, upper right-hand contact of sequence switch spring 333 (10+15), front contar t and inner righthand armature of relay 327, lower righthand contact of sequence switch contact 315 (1+14), upper left-hand contact of sequence switch spring 315 (7%+13 to ground.
  • this holding circuit for relay 325 is opened and relay 325 deenergizes, thereby opening the circuits controlled thereby.
  • sequence switch of the oflice sender is driven into normal position and the circuits of the sender are restored to normal in the well-known manner.
  • the incoming selector switch functions to apply ringing currentand when the called subscriber answers relay 421 deenergizes whereupon the ringing current is disconnected from the called line and the sequence switch 400 is driven from position 14 to 16, all as described in the aforementioned patent to Taggart and Send- As soon as sequence switch 400 reaches position 14, a direct current path is established through the right-hand winding of repeating coil 458, and thence over the called subscribers line for supplying the called subscribers line with talking current.
  • This path may be traced from grounded battery through the lower right-hand winding of repeating coil 458, winding of supervisory relay 459, contact of sequence switch spring 414 (14+16), brush 448 and terminal 449 of the incoming selector switch, brush 480, and terminal 482 of the final selector switch, thence through the called subsrribers substation loop, terminal 486 and brush 484 of the final selector switch, terminal 447 and brush 446 of the incoming selector switch, contact of sequence switch spring 413 (13%+16), and thence to ground through the upper right-hand winding of repeating coil 458.
  • Supervisory relay 459 energizes in this circuit and connects the terminals of the central station battery between the lefthand windings of repeating coil 458 in such a manner as to cause current to flow over the trunk line incoming through the selector switch and the district selector switch in such a manner as to energize the polarized call charging relay 374 at the district selector switch to close its alternate contact.
  • This circuit may be traced from grounded battery over conductor 460, through the upper contact of sequence switch spring 405 (11+16), conductor 426. resistance element 425, upper contacts of sequence switch spring 415 (11'to 16), lower left-hand winding of repeating (oil 4.58, lower contact of sequence switch spring 404 (11-1-16).
  • trunk conductor 420, contact 356 and brush 352 of the district selector switch upper right-hand contact of sequence switch spring 319 (9-1-14), lower left-hand contact of sequence switch spring 319 (114-13 4). lower righthand winding of repeating coil 336, upper left-hand contact of sequence switch spring 396 (10+11 winding of polarized relay 374, upper right-hand contact of sequence switch spring 395 (104-13 4), up-
  • sequence switch spring 395 (10+11 upper right-hand winding of repeating coil 336, upper lefthand contact of sequence switch spring 31% (114-13 1;), upper right-hand contact of se quence switch spring 318 (9+14), brush 351 and contact 355 of the district selecto switch, trunk conductor 419, upper contac of sequence switch spring 403 (11+16), upper left-hand winding of repeating coil 458. resistance 424, and thence through the armature and contact of supervisory relay 459 t ground.
  • the calling and called subscribers are now connected over a't-alking circuit with each other, shown on the drawing by heavy lines, the calling subscriber receiving current over the circuit previously traced through the left-hand winding of repeating coil 336, and the called subscriber receiving current over the repeating coil 458.
  • Relay 252 upon energizing, locks up through its left-hand winding and outer left-hand contacts to conductor 261, and at its inner left-hand armature prepares a circuit for the call charging relay 365 which is closed upon the advance of the interrupter cam 259 to a position in which its contacts 260 are opened and its contacts 262 are closed.
  • This circuit may be traced from grounded battery, through the right and left-hand windings of relay 365, contacts 262. front contact and inner left-hand armature of relay 252, outer left-hand armature and front contact of relay 252, and thence to ground on conductor 261.
  • Relay 365 upon energizing in this circuit, closes a locking circuit for itself extending through its windings, lower right-hand and upper left-hand contacts of sequence switch earn 305, and to ground at the outer right-hand contacts of relay 365. At its innermost right-hand armature, relay 365 prepares a circuit for charging a call on the calling partys message register as soon as the calling arty restores the receiver to the switchhoo to release the established connection.
  • both the calling and called subscribers restore their respective receivers to their switchhooks and the circuit previously traced through the answering supervisory relay 370 is opened at the switchhook contacts at the calling subscribers station.
  • This relay upon deener'gizing opens the lockneensee I ing circuit of slow to release relay 390, which, after an interval, closes a circuit for driving, sequence switch 300 out of position 11 into position 16.
  • This circuit may be traced from grounded battery, through the winding of sequence switch magnet 300. lower left-hand and upper left-hand contacts of sequence switch spring 323 (11+15), right hand normal contacts of relay 390 and lower left-hand contacts of sequence switch spring 314 (l 448 1,) to ground.
  • the circuit previously traced extending through the windings of sleeve relay 398 is opened at the left-hand alternate contacts of relay 390 and relay 398 thereupon releases.
  • en sequence switch 300 reaches position 13, a circuit is established to the stepping magnet 230 of the steering switch RS for advancing the wipers of the steering switch from position 10 into position 11, which circuit may be traced from grounded battery through the 10th position contact, upon which wiper 247 is resting, wiper 247, winding of stepping magnet 230, wiper 231 and the 10th position contact upon which this wiper is standing, conductor 233, and thence to ground at the upper left-hand contact of sequence switch spring 389 (13+13 This circuit is maintained until the' sequence switch leaves position 13% when stepping magnet 230 deenergizes, advancing the wipers to position 11.
  • the tip con uctor of the calling subscribers line is connected over the wiper 242, to grounded battery to discharge the subscribers line and, when passing over positions 14 to 16, the testing relay 249 is again connected to the tip conductor of the calling line to test for an unsta-ndard condition of the line. If the calling line is in a standard condition, no ground is connected at this time, since the calling subscriber has restored his receiver to the switchhook and has thereby 7 this time.
  • test relay 249 will become energized at In order that the test may be made both on the tip and ring conductors, theyare bridged together at this time over a circuit extendin from conductor 116 through the lower right-hand contact of sequence switch spring 312 (14 4-1-17). lefthand contacts of charging relay 365 and thence to conductor 1.17 through the lower right-hand contact of sequence switch spring 313 (16).
  • test relay 249 operates on this second test, a holding circuit is established for relay 252 for maintaining this relay energized when the steering switch reaches position 16.
  • Relay 252 is operated over a local circuit while the steering switch was passing from position 9 to 15 which may be trace from grounded battery, through its righthand winding, contacts 9 to 15 over which the wiper 266 passes, wiper 266. conductor 248 and thence to ground through the lower left-hand contact of sequence switch spring 380 (15 to 18) and upper right-hand contact of said spring (2+18) to ground.
  • relay 252 may be traced from grounded battery. through its righthand winding, outer left-hand armature and front contact of relay 224 and thence to ground at the armature and front contact of relay 249. )Vith relay 252 operated when the steering switch RS reaches position 16, the steering switch is arrested in position 16 and the circuit is established to the selector time alarm extending from ground on conductor 248, wiper 266, the 16th position contact upon which the wiper rests and over conductor 264 to the selector time alarm.
  • the operation of the selector time alarm warns the switchboard attendant that an unstandard condition obtains on a connection that has been established through the particular district selector switch with which the time alarm is associated.
  • the operation of relay 249 at this time prevents the registration of the call upon the message register of either of the parties on the calling line, and therefore prevents the registration of a call on the register of the party A when the party A may not have been the calling arty.
  • relay 252 will not be held energized when the steering switch reaches position 16 and the steering switch will, therefore, be advanced out of position 16 by a circuitextending from grounded battery, through the back contact, armature and winding of stepping magnet 230, wiper 231,
  • the wipers of the steering switch have reached position 17 they are advanced into position 20 through the operation of interrupter cam 254 in the manner previously described.
  • relay 296 will be shunted down by. a path including grounded battery, resistance 250, inner right-hand contacts of relay 222, 17th, 18th and 19th position contacts a of wiper 266, wiper 266, conductor 284, lower left-hand contact of sequence switch spring 380 (15+18) and ground at the upper right-hand contacts of said spring (2+18), causing the-release of relay 398 and the cut-off relay 103, associated with calling subscribers line.
  • the circuit for operating the message register associated with the callin line is then completed over a path extending from ground, through the message register magnet 123, back contact and outer right-hand armature of relay 103, back contact and outer righthand armature of relay 102, contact 203 and brush 207, resistance 297, contacts of relay 279,- outer right-hand alternate contacts of relay 222, inner right-hand normal contact of relay 252, lower left-hand contact of sequence switch spring 381 (16), upper lefthand contact of said spring (11-1-16), and inner light-hand contacts of charging relay 365 to grounded battery.
  • the message register now operates in a manner well known in the art and registers a call against the calling party A.
  • relay 249 and consequently relay 222 would not have energized in position 7 of the steering switch RS.
  • Relay 296 will not be shunted down in positions 17, 18 and 19 of the steering switch and relay 398 will remain operated.
  • the circuit for maintaining relay 398 operated includes grounded battery at the inner right-hand contacts of relay 365, upper left-hand contacts of sequence switch spring 381 (11-1-16), winding of relay 398, outer left-hand contacts of relay 296, righthand normal contacts of relay 299. segment 284 and ground at brush 281. Since relay 398 is held at this time, relay 103 remains operated.
  • the circuit for operating the message register may be traced :trom ground, through the message register 144, front contact and right-hand armature of relay 103,
  • sequence switclr300 In position 17, the sequence switclr300 isadvanced to position 18 under control of spring301. With sequence-switch 300 in position 18, a circuit is established for advancing the steering switch into position 21, which circuit may be traced from grounded battery, through the back contact, armature and winding of the stepping magnet 230, wiper 231, the twentieth position contact with which it is associated, lower right-hand contact of sequence switch 323 (18), upper lefthand contact of said spring (118) right-hand normal contacts of relay 390, thence to ground to the lower: left-hand contact of sequence switch spring 314 (1 448 4).
  • sequence switch 300 With the steering switch in normal position, a circuit is now established for driving sequence switch 300 into normal position which may be traced from grounded battery, through the magnet winding of sequence switch 300, upper righthand contact of sequence switch spring 306 (4+18), the normal or No. 1 contact with which wiper 291 of the steering switch is in engagement, wiper 291, normal segment 379, brush 360, conductor 344 and thence to ground through the lower right-hand contact of sequence switch spring 314 (8+6).
  • Relay 270 in operating, starts the down-drive of the line finder switch LF.
  • Relay 270 in attracting its outer right-hand armature coinpletcs an obvious circuit through the lefthand winding of relay 292 causing the energization of said relay 292.
  • Relay 292 in operating, holds the tip and ring talking conductors 116 and 117 open during the down-drive.
  • said relay 421 releases and causes the restoration of the incoming selector to normal, after which the final selector is restored to normal in the manner described in the aforementioned Taggart et alcpatcnt.
  • switch 300 in position 18 comes deenergized, opening the circuit of up-drive magnet 338 and establishes the previously traced circuit for driving the sequence switch 300 out of position 7 and into position 8.
  • relay 327 becomes energized over a local circuit extending from grounded battery, through its righthand winding, upper left-hand contact sequence switch spring 304 (8+9), upper right-hand contact of sequence switch spring 305 (1+9), upper left-hand contact of said s ring (8+16 A), and the outer right-han contacts of relay 365 to ground, and closes at its outer right-hand armature and front contact, a circuit for driving sequence switch 300 out of position 8 and into position 9.
  • relay 327 is maintained energized over the previously traced circuit.
  • sequence switch 300 out of position 9 to position 10 which circuit may be traced from grounded battery, through sequence switch magnet 300, lower left-hand sequence switch spring 311 (9), upper left-hand con tact of spring 311 (9+13), conductor 343, commutator segment 342, brush 341, conductor 344, and thence to ground through the lower right-hand contact of sequence switch spring 314 (8+6).
  • sequence switch 300 When sequence switch 300 reaches position 10, a circuit is established for relay 327 which is traced from grounded battery, through the lefthand winding of relay 327,1ower left-hand contact of sequence switch spring 310 (10), upper left-hand contact of sequence switch spring 311 (9+13), conductor'343, commutator segment 342, brush 341, conductor'344 and thence to ground through the lower right-hand contacts of sequence switch.
  • the steering switch has at this time positioned its wipers on the No. 8 contacts of its banks in the manner previously described and a circuit is established through the outer right-hand armature and front contact of relay 327 for driv-- ing sequence switch 300 out of position 10. When the sequence switch leaves position 10.
  • This tonecurrent is inductively transmitted over the calling subscribers line through the left-hand windings of repeating coil 336, the supervisory relay 370 and the wipers 242 and 243 of the steering switch.
  • the calling subscriber receiving this tone is apprised of the fact that it is impossible to obtain the desired connection at this time and therefore restores his receiver to its switchhook to release the connection.
  • a calling telephone line a plurality of stations thereon, a message register for each station of the line, automatic switching means for extending a connection from the calling line, a circuit for operating the message registers, means common to a plurality of lines for testin the calling line to determine which station of the party line is calling, a switching device individual to the calling line controlled by said testing means for extending said circuit to the message register corresponding to the calling line, and; means for closing said message register circuit to actuate said register.
  • a calling telephone line a plurality of stations thereon, a message register for each station of the line, automatic switching means for extending a connection from the telephone line, a circuit for operating the message registers, means common to a plurality of lines for testing the calling line to determine which station of the party line is calling, electromagnetic means individual to the

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Description

June 9, 1925. 1,541,356
F. S. IRVINE MESSAGE REGISTER SYSTEM Filed Nov. 24. 1922 5 Sheets-Sheet 1 Myen/af: Fran/r 5. /r|//'/1e.
by WA 173/.
June 9, 1925. 1,541,356
F. s. IRVINE MESSAGE REGI STER SYSTEM Filed Nov. 24, 1922' 5 Sheets-Sheet 2 Q8 Y u .2
Arty
June 9, 1925.
F. S. IRVINE MESSAGE REGISTER SYSTEM w 6 w M m M m a 29 cw 9 25:2 m w 2 m n 5 W k mrn N i 2 mi a y 0 M I v m w m June 9, 1925.
F. S. IRVINE MESSAGE REGISTER SYSTEM Filed Nov. 24, 1922 5 Sheets-Sheet 4 June 9, 1925. 1,541,356
F. S. IRVINE MESSAGE REGISTER SYSTEM Filed Nov. 24, 1922 5 Sheets-Sheet 5 A/f'y Patented dune W25.
cam-c start e Z P-Artur civics.
FRANK s; IRVINE, ornun'rineron, NEW. YORK. Assienon 'ro wns'rnan nnncrnic COMPANY, moonrona'rnn, or new YORK,- my a ccnrona'r on or new YORK.
stresses-REGI TER. sysrnm.
Application filed November 24, 1122. Serial No. 602,9 18,
To all whom it may conceit;
die it known that I, FRANK S. IRVINE, a
citizen of the United States, residing at.
Huntington, in. the county of Sufiolk and Stateof New York, have inventedrcrtain new and useful Improvements in Message- Register Systems, of whichthe following is a fulL-clear, concise, and exact description.
This invention relates to message register systems for telephonev exchanges and more particularly to message register systems for use in telephone exchanges employing party line-working wherein each of the stationsot' the party line is provided at the central .of- .fice with a message register for registering calls.
An object of the invention is to provide an improved circuit arrangement for use in systems of this nature for selectively associating with the calling station of a party line the message register individual thereto and for subsequently operating said register.
Another object of the invention is an inn proved arrangement for pieventing the re istration of calls upon the party lines whio are in an unstandard' condition. i
To attain the objects of the invention, each station of the party line isprovided with a certain test condition and the first selector ing which station of the party line is'calling.
The testing means controls the actuation of I the nduction coil when the receiver ed the a switching device associated withlthe calling line, which in turn controls the inclusion of the message register correspondingto the I .iground to the tip conductor of .the 11118 The substation on callingdine in the message register circuit.
This organization provides an improvement 1 (nor a circuit arrangement shown in a patent to l). M. Taggart aiid QF. J. Scuddel', 1,513,351, issued Oct. 28, 1924, wherein the switching device is not individual to the callfline,-tl etesting means operates at this time,
prevents the charging ofthe-call and causes the operation of an alarm device.
i The invention may be more-readily understood hyi'eference to-the following descrip tion considered in connection witlithe ac; 'coinpanying drawings, in which Fig. 1- shows one of agroup of two-party lines for use in a full mechanical office. Figs. 2, 3 and 5, whenv taken togethenshow the circuits of a line finder having access to the subscribers line shown in Fig. 1-, .the circuits of a dis trict selector switch, a sender tinder and so much oi'an office sender as is necessary for an understanding of the invention; Fig. 4: in
- eludes a schematic showing of an incoming selector switch, a final selector switch and a subscrihers line to which the final selector i switch has access. I The several figures of the drawing should be arranged with Fig. 1 to the left, FigsjQ, 3 and 4 in consecutive order 'switchhook, whereas at thei other substation; the-call bell is at all times connected from through? a condenser. called line C, 4, is of the usual type. 4
The calling line terminates in a line finder switch of the well-known power driven paneltype. The brushes of the line finder are connected to the circuit of a district selector switch. Associated with each of the substations A and B, connected to the calling line, is a message register. Associated with the calling line is a cut-0d re lay, which controls the extension of a common operating circuit extending through a .hrush of the-line finder switch to the message registers.
district selector, incoming selector ice and final selector switches shown in Figs. 3 and 4 are of the general t pe shown and described in the patent to raft and Reynolds, 1,123,696, issued January 5, 1915. Each of. these switches has a vertically dis posed switch shaft provided with five sets of brushes, each brush set having access to a bank of one-hundred terminals. For driw ing the switch shaft upwardly, an updrive magnet is provided, which, when energized, presses the switch shaft against a constant- 1 rotating power drum, and for restoring the switch shaft to normal position, a downdrive magnet is provided, which, when energized, presses the switch shaft against a second constantly driven drum. For determining the particular set of brushes on the switch shaft to be employed, a tripping spindle is provided as described in the patent hereinbefore referred to. The circuits of the incoming selectorswitch and the final selector switch may be of the type described in the patent to D. M. Taggart, et al., hereinabove mentioned.
The steering switch RS, shown in Fig. 2, and the sender finder switch FS, shown in Fig. 3, are of the well-known step-by-step type, the wipers of which are advanced by a stepping magnet. The switch RS functions during a complete half revolution and upon the termination of a connection left with its wipers in normal condition for serving on a new call. The wipers of finder switch FS have no normal" contacts, the wipers resting in contact with the bank ter minals last employed by the switch when the switch is not being employed.
The ofiice sender has been only partially disclosed in Fig. 5, only such portions of the sender being disclosed as are considered necessary for an understanding of this invention. The circuits of a complete otfice sender are disclosed in Patent No. 1,395,977 to F. A. Stearn and F. J. Scudder, of November 1, 1921.
For controlling the circuits associated withthe several selector switches and the circuits of the ofiice sender, auxiliary switches are provided. These switches may be of the type described in the patent to Reynolds, et al., 1,127,808, issued February 9, 1915, and known in the art as sequence switches. Each sequence switch comprises a rotatable shaft driven from a constantly operating source of power through a magnetic clutch member and carries a plurality of circuit closing cams which at difierent radial ositions of the shaft, cause the closure 0 a plurality of contacts. The cam contacts associated with each sequence switch are closed only in the positions indicated by the numerals, with the exception of the master contacts 301, 401 and 551 associated, respectively, with the switches 300, 400 and 550, these latter contacts being opened in positions indicated by the numerals appearing adjacent such contacts and closed in all other positions.
The different pieces of apparatus -employed in the system having now been briefly described, it is thought that a clearer understanding of the invention may be had from a description of the method of establishing a. call. It will first be assumed that the subscriber at substation A desires connection with a line at substation and that the directory number of the desired subscriber is LISpenard 9532.
Upon removal of the receiver from the switchhook at the station A, a circuit is established for line relay 102 over a path including grounded battery, winding of re left-hand armature of relay 103 and ground.
The line relay 102 becomes energized in this circuit and completes a circuit for the group relay 104, common to all lines in the A sub-- group of this particular brush group, to ground at the inner armature and contact of relay 102. Relay 104 becomes energized and completes a circuit from ground through its armature and contact, contact and armature of relay 105, left-hand armature and back contact of relay 106 and lefthand winding of relay 107 to grounded battery. Relay 107 operates in this circuit and in attracting its right-hand armature completes a locking circuit for itself and an energizing circuit for relay 218, said circuit extending over a path including grounded battery, winding of relay 218, conductor 124, right-hand armature, front contact and right-hand winding of relay 107 to ground. Relay 107, in attracting its outer left-hand armature completes an obvious circuit for operating the tripping magnet 213. Triplng magnet 213 rotates its tripping spin (lo 212. The tripping spindle in its rotated position prepares for the tripping of the set of brushes on the particular finder switch that is started in operation to find the calling line.
Relay 218, in operating, completes a circuit for relay 299 over a path including grounded battery, right-hand winding of relay 299, back contact and outer right-hand armature of relay 298. back contact and right-hand armature of relay 2941. and contact and armature of relay 218 to ground. Relay 299, in operating, locks over a path including grounded battery, rigl'it-hand winding, front contact and inner left-hand armature and left-hand winding of relay 299, and ground at the back contact and armature of relay 214. Relay 299 in attracting its outer lett-hand armature completes a circuit for the updrive power magnet 216 over a path including segment 295 tact 287 is momentarily closed and a circuit is established from ground over said contact, conductor 1525, inner left-hand armature and front contact of relay 107 and the winding of relay 106 to grounded battery. Relay 1.06 attracts its armatures and locks in a circuit including battery, windin front contact and left-hand armature of relay 106. armature and back contact of relay 105 and ground at the contacts of relay 104. Relay 106, in attracting its right-hand armature closes a circuit for the right-hand winding of relay 105. This winding is wound so that suflicient flux is not produced to cause the operation of relay 105. The right-hand winding of relay 103, however, maintains the armature of said relay attracted when it has been operated by the left-hand winding. Relay 299, in attracting its outer left-hand arn'iature also completes a circuit for relay 325, said circuit including ground at brush segment 205, front contact and outer left-hand armature of relay 299, inner righthand armature and. back contact oi relay 296, and grounded battery at the left-hand winding of relay 232,5. Relay operates in. this circuit and lurks over a path including battery, right-hand winding ofrelay 325, left-hand contact of sequence switch spring 308 (1 +10), outer right-hand armature and front contact of reay 3:35 and ground at the wiper 1' 1 ot' the sender finder FS provided the arm 301 is star ding on the test terminal of a busy sender. The operation of the sender finder FS ill be described hereafter. Relay 325 in operaring completes an obvious circuit through its inner left-hand contacts for operating rela 394.
As the brushes 204 to 207 inclusive of the switch LF- are moved upwardly, brush 281 comes into engagement with segment 284 and comph tesa a circuit for relays 294a and 200, said circuit extending over a path fron'i ground through brush 281. segment 284: and thence in 'iarallcl, one path extending through the right-hand alternate contacts of relay 200. inner right-hand normal ((lIlizlClS oi relay "ll-lb. left-hand normal contacts and winding of relay 294i, and the other path extending through the winding of relay 206 to grounded battery. Relay 2294, in operating. opens at its right-hand contacts the original energizing circuit for relay 205), but relay 29!) remains energized through its locking circuit. Relay 2%. in operating. completes a circuit. for the energization of relay 2028, said circuit inrluiiling grounded battery, right-hand winding of relay 2295 and ground at the inner left-hand contacts of relay 290. Relay 208, in operating, locks over a path including ground through the contacts of relay 218, left-hand contact and winding of relay 298 and grounded battery at the left-hand contacts of relay 398. Relay'296 in operating also completes a circuit for the energization of relay 292 and the stepping magnet 303 of the switch F S, said circuit extending from ground, through the lower left-hand contact of se uence switch spring 389 (Ll-1 A), outer rig it-hand con tacts of relay 296, inner right-hand alternate contacts of relay 825 and thence in parallel, one path extending through the contacts and winding of stepping magnet 303 to grounded battery and the other path extending through the right-hand Winding of relay 292 to grounded battery. Relay 296, in operating, also completes a circuit for the energization of relay 390, said circuit extending over a path from grounded battery, through the right-hand winding of relay 2500, intermediate right-hand contacts of relay 2.00 and upper lcft-hand contact of sequence switch spring 314 (LI-10 A), to ground. As the line finder brush shaft is moved upwardly, brush 286 engages segment Q93 causing a shunt to be placed around the winding of relay 107 whereupon said relay 107 releases. 286 passes out of engagement with segment 203, relay 218 releases.
When the brush shaftof the line finder arrives at the terminal of the calling line, relay 214 operates over a path extending from ground, through the outer right-hand contacts oi relay 270, winding of relay 21%, upper left-hand contact of sequence switch spring 380 (1 lower right-hand contact of said spring (1), brush 207, contact 203, outer right-hand alternate contacts of relay 102 and left-hand winding of relay 105 to grounded battery. Immediately thereafter or when the brush 280 centers upon the contact of the segment 283, corresponding to the calling line, the locking circuit for relay 299 is opened whereupon said relay releases and opens at its outer left-hand contacts the circuit for the updrive magnet 216 whereulion the upward movement of the brushes is stopped. Relay 308 then operates over a path extending from grounded hattery. tin-(nigh the left-hand normal contacts of relay 2T0, left-hand alternate contacts of relay 1500. upper right-hand Contact of se quence switch spring 2301 (1+15), winding of relay 398. outer left-hand contacts of relay 296. outer right-hand normal contacts oi? rcla-y 129$), segment 284: and brush 281 to ground. The relay 39a, in operating, completes a circuit for the energization of the cut-off relay 10 1 of the calling line, said circuit extending over path from ground thrijiugh the winding of relay 103, contact \V hen the brush 202, brush 206, resistance 388 and left-hand alternate contacts of relay 398 to grounded battery. Relay 103, in operating, disconnects the line relay 102 from the calling line.
l/Vith sequence switch 300 in position 1, stepping magnet 303, associated with the switch FS, is energized as previouslyvdescribed and relay 325 is locked up to ground at a busy contact of switch FS provided wiper 391 of the switch FS is resting on the contacts of a busy sender. So long, however, as the test wiper 391 of the switch FS encounters contacts upon which busy ground potential exists, the stepping magnet 303 will advance the wipers of the switch until an idle sender is found, when the wiper 391 will find no ground on the contacts of the idle sender and the relay 325 will thereupon become deenergized. Relay 325, in retracting its inner right-hand armature, opens the circuit previously traced for relay 292 and stepping magnet 303, and in retracting its inner left-hand armature opens the circuit for relay 394, whereupon said relays 292 and 394 release. As soon as, relay 292 releases, a circuit for operating relay 365 is com pleted over a path extending from grounded battery, through the right and left-hand windings of relay 365, lower right and lefthand contacts of sequence switch spring 305 (1), inner right-hand contacts of relay 398, right-hand contacts of relay 292, segment 295 and brush 282 to ground. If the sequence switch 300 remains in position 1 longer than a certain interval, an alarm signal is actuated. Relay 327 also operates over a circuit extending from grounded battery, through the right-hand winding of relay 327, upper left-hand contact-of sequence switch 304 (1), upper right-hand contact of sequence switch contact 305 (1+9), lower left-hand contact of said spring (1), inner right-hand contacts of relay 398, right-hand contacts of relay 292, segment 295 and brush 282 to ground. Sequence switch magnet 300 then operates over a path extending from grounded battery, through winding of magnet 300, lower righthand contacts of sequence switch spring 306 (1), front contact and outer right-hand armature of relay 327 and upper right-hand contar t of sequence switch spring 307 (1+5) to ground. driving sequence switch 300 from position 1 into position 2. As sequence switch 300 moves out of position 1, the circuits for relays 327 and 365 are opened and these relays release. If, at the time relay is energized, the wipers of switch FS are standing upon contacts which are connected to circuits extending to an idle ofiice sender, relay 325 does not lock up over the Circuit previously traced and the circuit previously traced through stepping magnet 303 is immediately opened at the inner righthand armature and front contact of relay menses 325a prevent the advance of the wipers of the switch FS.
In position 2 of sequence switch 300, relay 325 operates over a path including a grounded battery and ground at the lower right-hand contacts of spring 308 (2+13). Relay 39 1 then operates over' an obvious circuit. With the sequence switch 300 in position 2, relay 510, associated with the selected ofiice sender, is operated over a path extending from grounded battery, through the right-hand winding of relay 510, wiper 391 of the switch FS, outer right-hand contacts of relay 325 and lower right-hand contacts of spring 308 (2+13), to ground. Relay 510 energizes in this circuit and causes the advancement of the time measuring switch, not shown, associated with the ofiice sender in the manner fully set forth in the patent of Stearn and Scudder, hereinhefore re ferred to, which time measuring switch upon leaving normal position closes the off-non mal contact 511. The test contact upon which wiper 391 is now resting is marked with a busy ground potential over a circuit which may be traced from off-normal contact 511, through the left-hand winding of differential relay 510, and thence to the wiper 391, whereby the sender is marked as busy until the office sender has been restored to normal condition either following the abandonment of the call or the termination of the functioning of the office sender.
lVith relays 510 and 394 energized, an impulsing circuit is now established from the conductors of the calling line through the winding of the sender pulsing relay for enabling the calling subscriber to set the registers (not shown) associated with the sender in accordance with the designation of the desired line. This circuit may be traced from ground, through the armature and front contact of relay 510, conductor 513, contact 386 and wiper 375 of the sender tinder FS, inner left-hand contacts of relay 394, lower right-hand contact of sequence switch spring 313 (2+9 conductor 117, inner left-hand contacts of relay 292, brush 205 and contact 201 of the switch LF, thence through the impulse contacts 130 of the calling subscribers dial S. through the subscribers substation circuit. contact 200 and brush 201 of the switch Ll intermediate 1e ft-haud contacts of relay 29:3. conductor 116. lower left-hand contact of sequence switch spring 312 (2-l-9 wiper 317 and contact 385 of switch FS. thence through the winding of pulsing relay 512 to battery.
The calling subscriber now receives a dialing tone over this circuit in the manner set forth in the aforesaid patent of Steam ct al. and then proceeds to dial the number of the desired line. Under the assumpt on that the subscriber desires a connection with thence Ill) menace a subscribers line C which line is listed in the directory as LISpenard 9532, the subscriber proceeds to dial the three letters L I S corresponding to the designation of the ofiice in which the desired line .is located and then dials the four digits representing the number of the line, which number, as assumed, is 9532. The three letters which represent the district code will cause the setting of code registers (not shown) associated with the office sender which, in turn, control the operation of the sender to control the setting of the dstrict selector switch 350 and the setting of the sequence switch of the district selector for determining the proper talking path through the repeating coil 336 associated with the district selector. The transmission of the impulses corresponding to the number of the desired subscribers line 9532 causes the setting of the numerical registers associated with the sender to control the sender to govern the setting of the incoming selector switch 450 and of the final selector switch 490 for ex tending the connection to the desired line in the selected district.
Following the setting of the code registers of the sender. the sequence switch 550 associated with the ofiice sender is driven into position 2 in the manner set forth in the aforesaid patent of Steam, et al., for establishing a fundamental circuit extending from the office sender through the winding of relay 327 of the district selector switch for controlling the setting of the district selector. Since at this time the sequence switch 300 of the district selector is in position 2. the fundamental circuit may be traced from grounded battery, through the left-hand winding of relay 327, the lower left-hand contact of sequence switch spring 310 (2), upper left-hand contact of said spring (2+5), outer left-hand contacts of relay-325, wiper 350 and contact 383 of switch FS, upper and lower contact-s of sequence switch spring 519 (2), armature and back contact of the 0 countin relay 520, the windings of the polarized relay 52-2, the windings of sender stepping relay 521 and thence to ground through the lower left-hand and right-hand contacts of se quence switch cam 523 and resistance element 524.
Relay 327 of the district selector switch and stepping relay 521 of the oflice sender are energized in this circuit. Relay 521, upon energizing, establishes a circuit in the well-known manner for an upper counting.
relay of the group of counting relays associated with the sender corresponding to the setting of the code registers and relay 327 closes a circuit for driving sequence switch 300 f the district selector out of position 2 and into position 3. This circuit extends from grounded battery, through the magnet winding of sequence switch 300,
lower right-hand contact of sequence switch right-hand contacts of relay 394, lower lefthand contact of sequence switch spring 333 (2+9), wiper 397 and contact 393 of switch FS, right-hand contacts of relay 537 and resistance 538 to ground. Relay 365 0 rates in this circuit but performs no usefu function at this time. sequence switch 300 in position 3, the initial energizing circuit of relay 327 is opened at the lower left-hand contact of sequence switch spring 310, but relay 327 is maintained energized over the fundamental circuit by a new circuit extendin from grounded battery, through its leftand winding, its left-hand armature and front contact and thence through the lower right-hand contact of sequence switch cam 310 (1+5) and over the fundamental circuit as previously traced. A circuit is now closed for the updrive magnet 338 of the district selector, which circuit extends from grounded battery, through the winding of magnet 338, the upper righthand contact of sequence switch spring 309 (3). the lower left-hand contact of said spring (3+18), front contact and outer right-hand armature of relay 327, upper right-hand contact of sequence switch sprmg 307 (1+5) to ground. Magnet 338, upon energizing, presses the depending portion of the switch shaft (not shown) against the constantly rotating updrive drum (not shown), thereby causing the updrive movement of the switch shaft.
As the switch shaft at the district selector switch moves upwardly and approaches its first brush tripping position, brush 341 engages the first metallic portion of the commutator segment 342 and a circuit is closed as follows in shunt of the windings of the sender stepping relay 521 which may be traced from grounded battery, through the left-hand winding, front contact and lefthand armature of relay 327, the lower righthand contact of sequence switch spring 310 (1+5), upper lefthand contact of sequence switch spring 311 (2 +3), conductor 343, commutator segment 342, brush 341, conductor 344, lower right-hand contact of sequence switch spring 314 (8+6), to ground. Relay 327 is maintained energized over this shunt circuit but relay 521 being shunted deenergizes causing in the well-known manner the energization of the lower counting relay corresponding to the previously energized upper counting relay. As the switch shaft With the district selector continued its upward movement, brush 341 poition of the. segment 342 and the shunt around the windings of sendcr stepping relay 521 is removed, whereupon the sender stepping relay again energizes. in this manner, during the upward movement of the switch shaft. the stepping relay 521 of the oflice sender is intermittently energized and dc energized causing tllGiSllCCGSSlVB energization of the counting relays associated with the sender. If it be assumed that the No. 2 counting relay was energized upon the initial energization of: sender stepping relay 521, then, when the switch shaft of the district selector has advanced to such a position as to position the third set of brushes can ried thereby in position to be tripped, the No. 0 counting relay 520 will be energized in series with the No. 0 counting relay 525 and will open the previously traced fundamental cireuit at its armature and back contact. Counting relay 520 is also instrumental at this time in causing the advancement of the sender sequence switch 550 out of position 2 and into position 4; Upon leaving) position 2, all counting relays which have een energized and looked upgover the circuit extending from the sequence switch contact 526, become deenergized.
As soon following the opening of the fundamental circuit by the No. 0 counting relay 520 as the brush 341 engages the next insulating portion of the commutator segment 342, relay 327 becomes deenergized and closes a circuit for driving district selector sequence switch 300 out of position 3 and.
"ith sequence switch 330 of the district selector in position 4 and the sender sequence switch 550 in position 4, the fundamental circuit previously traced is again established and relays 327 and 521 again energize. Relay 521 now establishes acircuit through one of the upper counting; rclays in accordance wilhthe setting of the code registers and relay 327 establishes a, circuit for driving sequence switch 30(1 out of position 4 and into position 5, this circuit extending from grounded battery, through the magnet winding of sequence switch 300, the lower right-hand contact of sequence switch spring 306 (4), front colitact and outer right-hand armature of remamas W V lay 327 and right-hand contact of sequence moves into engagement with an insulating.
switch spring 307 (1+5) to ground. Upon leaving position 4, sequence switch 3()() opens the initial energizing circuit. of relay 327 but relay 327 is DOW maintained energized over the fundamental circuit through the lower right-hand contact of sequence switch spring 310 (1+5) and the left-hand armature; and front contact and left-hand winding of relay 327.
Upon reaching position5, the circuit previously traced through the winding of updrive magnet 338 is again established through the upper right-hand contact of sequence switch spring 309 (5) {and in the manner previously described the switch shaft is again drgiven upwardly. Since at this time; however, the tripping spindle (not shown) has'been rotated by the tripping magnet 346 which was energized in position 4 of thesequenoe switch over a circuit extending from grounded battery, through the winding of tripping magnet 346 and to ground through the upper righthand contacts of sequence switch spring 308, the third set of brushes is now tripped through the initial upward movement of the switch shaft and during the continued upward: movement of the switch shaft the tripped set of brushes travel over the con- (acts of the bank with, which they are associated. The remaining four sets of brushes on the switch shaft are not tripped at this time and are, therefore, functionless.
As the switch shaft continues its upward movement and the tripped set of brushes approaches the first set of terminals in the first group of trunks to which the set of brushes has access, the brush 347 engages the first metallic portion of commutator segment 348 and a circuit is closed in shunt of the windings of the sender stepping relay 521, which shunt circuit may be traced from grounded battery, through the left-hand winding, left-hand armature and'front con tact of relay 327, the lower right-hand contact of sequence switch spring 310 (1+5). upper right-hand contact of said spring (4 44-5), conductor 349,5egment 348, brush 347. conductor 344. lower right-hand contact of sequence switch spring 314 (3+6). to ground. Relay 327 is held energized over this circuit, but sender stepping relay 521 deenergizes, causing, upon its deencrgiza-tion, the energization of a lower counting relay corresponding to the upper counting relay whiclrwas energized upon the initial energization of relay 521. 7
1 As the brush shaft continues in its upward movement, brush 347 engages an insulating portion of segment. 348 and the. shunt around the winding of sender stepping relay 521 is opened, whereupon relay 521 reenergizes causing the energization of the next succeeding upper counting relay.
In this manner during the continued advancement of the switch shaft, the steppin; relay 521 of the sender is intermittcntly energized and deenergized to encrgize and lock up successive lower and upper counting relays. If it be assumed that the subscriber has set the code registers in such a manner as to cause the No. 0 lower counting relay 525 to become energized upon the initial encrgization of relay 521, then upon the first deenergization of relay 521, the No. 0' counting relay 520 will become energized in series with relay 525, thereby opening the fundamental circuit and causing the advance of the sender sequence switch 550 from'position i into position 6. At this time the selected set of brushes of the district. selextor switch will be positioned upon the lowerinostset of terminals of the first group of its associated bank. Upon the advance of sequence switch 550 out of position 4. th locking circuit of counting relays. 5201 and is opened at sequence switch spring 526.
As soon following the opening of the fundamental circuit by the No. 0 counting relay T20 as the brush 347 engages the next insulating portion of commutator 348, relay 327 becomes deenergized, opening at the front contact of its inner right-hand armature, the previously traced circuit of the up drive magnet 338 to arrest the upwardmovement of the switch shaft, and closing at the back contact of its outer right-hand armature the previously traced circuit for advancing sequence switch 300 out of position 5 and into position 6.
At the time sequence switch 300 moved into position 5. a circuit was established for advancing the steering switch RS from position 1 to position 2. This circuit may be traced from grounded battery. through wiper 247. contact 227 winding of stepping magnet 230, wiper 231, contact 232. conduct-or 233 and thence to ground through the upper left-hand contact of sequence switch spring 389. Stepping magnet 230 energizes in this circuit and is held encrgized until sequence switch 300 leaves posi tion 6 4 when magnet 230 deenergizes to advance the wipers of switch RS to the second position contacts.
\Vith sequence switch 300 in position 6, a circuit is established for relay 327 which may be traced from grounded battery through its right-hand winding, left-hand contact of sequence switch spring 304 (6+ 6 upper right-hand contact of sequence switch spring 305 (1+9), lower left-hand contact of said spring (6+7), inner righthand, contacts of relay 398, right-hand contacts of relay 292, segment 295 and brush to ground. Relay 327, upon energizing, closes a circuit for driving sequence switch 300 out of position 6 and into position 7, This circuit may be traced from grounded battery, through the magnet winding of sequence switch 300, lower right-hand contact of sequence switch spring 306 ((3), outer right-hand contacts of relay 327, upper left-hand contacts of sequence switch spring 307 (6+7), right-hand alternate contacts of relay 390 and lower left-hand contact of sequence switch spring 314 (l +18 to ground.
As soon as sequence switch 300' leaves position (3 the initial energizing circuit of relay 327 is opened at sequence switch spring 304, but if the first. trunk in the group of trunks upon which the brushes 352 and 353 are now standing is busy, a ground potential exists on the test terminal 354 and relay 327 is maintained energized over a circuit ext-ending from grounded battery, through its left-hand winding, armature and front contact, lower left-hand contact of sequence switch spring 315 (6%+8),'lower right-hand contact of said spring (1+14), inner right-hand contacts of relay 327, righthand contacts of sequence switch spring 382 (6+7), brush 351) and terminal 35%, and when sequence switch 30!) reaches position 7, a circuit is established for the updrive magnet 338. The circuit of updrive magnet 338 may be traced from grounded battery, through the winding of this magnet, upper right-hand contact of switch spring 309 (7), lower left-hand contacts of said spring (3+ 18), outer right-hand alternate contacts of relay 327, and upper right-hand contact of sequence switch spring 307 to ground. The updrive magnet 338, upon energizing, drives the brushes upwardly in search of an idle trunk in the selected group. So long as the test brush 350 encounters the terminals of 'busy trunks, relay 327 remains locked.
no ground potential exists on the test terminal 357 and relay 327 deenergizes as soon as the brushes have been properly centered on the bank terminals 351, 352 and Until the brushes are centered, relay 327 is maintained looked over a circuit extending through its right-hand winding, the upper right-hand contact of sequence switch spring 304 (7), segment 359, brush 36(), upper lefthand contact of sequence switch spring 309 (7), lower left-hand contact of said spring (ll-+18), outer right-hand alternate contacts of relay 327, and upper right-hand contacts of sequence switch spring 307 (G 9) to ground. Relay 327, upon deenergizing, opens the circuit of updrive magnet 338, thereby arresting the brushes 351, 352 and 353 upon the terminals 355, 356 and 357 of the trunk line extending to the district of the exchange in which the desired Jun line terminates. Relay 327, upon deenergizlay 365 is operated over the path previously traced, including ground at resistance 538, and grounded battery at right-hand winding of relay In position 8 of sequence switch 300, relay 327 is again operated over a circuit extending from grounded battery, through the right-hand winding of relay 327, left contact of sequence switch spring 304, upper left-hand contact of sequence switch spring 305 (1+9), upper left hand contact of said spring (84-16%), and outer right-hand contacts of relay 365 to ground. Relay 327, upon energizing, closes a circuit through its outer right-hand armature and front contact for driving sequence switch 300 out of position 8 and into position This circuit extends from grounded battery, through the magnet winding of sequence switch 300, lower righthand contact of sequence switch spring 306, outer righthand contacts of relay 327 and upper righthand contact of sequence switch spring 307 to ground.
In position 9 of sequence switch 300, relay 327 is held energized over the circuit just traced until selection beyond the district selector 350 has been completed. In position 9 of sequence switch 350, the fundamental circuit is extended from the ofiice sender through contacts of se uence switch springs 318 and 319 of the istrict selector to the line relay 421 of the incoming selector switch 450. The fundamental circuit may be traced from grounded battery, through the left-hand winding of relay 421, lower contactof sequence switch spring 402 (1+10), upper contact of said spring (1), resistance 424, lower contact of spring 403 (1+10), conductor 419, terminal 355, brush 351, upper right-hand contact of spring 318 (9+14), lower left-hand contact of said spring (9), outer left-hand contacts of relay 325, wiper 350 and contact 383, upper and lower contacts of spring 519 (6), contacts of the counting relay 520, windings of relays 522 and 521, lower and upper contacts of spring 523 (6), wiper 339 and its associated contact, lower right'hand contact of spring 319 (9), upper right-hand contact of said spring (9+14), brush 352, terminal 356, conductor 420, upper contact of spring 404 (1+10), resistance 425 and lower contact of spring 405 to ground. Relays 521 and 421 energize in this circuit. In a manner fully described in the Taggart, etal. patent hereinbefore mentioned, the incoming selector switch is then set after which the final selector switch is set in its tens and units selection movements. During the units selection movement of the final selector switch, steering switch RS is in position 2, sequence switch 300 is in position 9, sequence switch 400. will be in position 8 and relay 421 of the incoming selector switch will be energized in the manner described in the Taggart et al. patent.
Following the units selection movement of the final selector switch and during the testing operation of the switch, the circuit of relay 421 is opened causing the deenergization of this relay. Relay 421, upon de energizing, closes a circuit for driving sequence switch 400 out of position 8 and into position 9. This circuit may be traced from tgrounded battery, through the windin 0 sequence switch magnet 400, upper le -hand contact of sequence switch spring 406 (8), and thence to ground at the inner left-hand armature and back contact of relay 421. WVith sequence switch 400 in position 9, relay 421 is again connected into the fundamental circuit extending through the windings of the sender stepping relay 521 and the windings of overflow relay 522, but since at this time the winding of relay 421 is connected to the ring conductor of the fundamental circuit rather than to the tip conductor as described in the Taggart et al. application, current flowing in the fundamental circuit now flows in a direction reverse to that direction in which it originally flowed. The circuit of relay 421 may be traced from grounded battery, through the left-hand winding of relay 421, lower contacts of sequence switch spring 415 (9), resistance element 425, upper contact of sequence switch spring 404 (1+10), thence over the fundamental circuit as previously traced and returning through the lower contact of sequence switch spring 403 (1+10), resistance element 424, contacts of sequence switch spring 408 (9), and thence to ground through the upper contacts of sequence switch spring 412. Y
The current now flowing over the fundamental circuit is in such a direction as to energize both the sender stepping relay 521 and the overflow relay 522. Overflow relay 522, upon energizing, establishes a circuit for the advance relay 537, which, at its armature and back contact, opens the previously traced circuit through the winding of call charging relay 365. Relay 365 thereupon deenergizes opening the circuit of relay 327, which thereupon deenergizes and establishes the previously traced circuit for driving sequence switch 300 of the district selector out of position 9 and into, position 10. With sequence switch 300 in position 10, a circuit is now established from grounded battery, through the lefthand winding of relay 327 of the district selector switch, lower left-hand contactof sequence switch spring 310 (10), upper lefthand contact of said spring (10+13),'front contact and outer left-hand armature of relay 325, wiper 350 and contact 383 of the sender finder FS, upper and lower contacts of sequence switch spring 519 (16),armature and back contact of the No. 0' counting relay 520, winding of overflow relay 522 and sender stepping relay 521, and thence to ground through the lower contacts of se uence switch spring 523 (1 Relays 32 and 521 energize in this c1rcuit, the relay 521 establishing a circuit for the lower counting relay for controlling the subse-v quent movement of'the sequence switch 300 of the district selector for controlling talking selection. In this case it will be assumed that the No. 0 counting relay has been prepared for operation through the setting of code registers by the calling subscriber.
Upon the movement of sequence switch 300 out of position 9 the impulsing circuit over which the calling subscriber set the registers of the ofiice sender is opened at contacts of sequence switch springs 312 and 313, and the talking conductors of the district selector trunk are now connected over contacts of these springs to wipers 242 and 243 of the steeringv switch RS. Sequence switch 300, upon reaching position 9%, establishes a circuit for advancing the steering switch RS from position 2 to position 3.
This circuit may be traced from grounded battery through the back contact and armature and winding of stepping magnet 230, wiper 231, the position 2 contact upon which it is now standing, conductor 233, and thence to ground through the upper left-hand con i the wiper 266, wiper 266, conductor 248, lower left-h and contact of sequence switch spring 380 (10), upper right-hand contact of said spring (2+18) to ground. The resistance of the right-hand winding of relay 244 is so selected that if relay 249 energizes in series therewith. relay 249 will consequently energize over the line resistance of any calling subscribers line to which it may be later connected in testing for a discriminatory condition upon such subscribers line. If relay 249 energizes, a circuit is immediately closed for energizing relay 252, which circuit may be traced from grounded battery, through the right-hand winding of relay 252, .front contact. and outer left-hand armature of relay 224, "and thence to ground at the armature and front contact of relay 249. Relay 252, upon energizing, establishes a circuit for advancing the steering switch out of position 3 and into position 4, this circuit extending virom grounded battery, through the back contact, armature and winding of stepping magnet 230, wiper 231, the third position contact upon which it is resting, and thence to ground at the outer right-hand armature and front contact of relay 252. Relay 252 performs no other use ful function at this time. As soon as the steering switch leaves position 3, the circult of relay 249 is opened and relays 249 and 252 release.
If the test relay 249 fails to energize when connected to the right-hand winding of relay 224 upon the routine test to determine thesensitiveness of relay 249, then the steering switch remains in position 3 and relay 224 is maintained energized for a sufiicient time to connect ground through its outer left-hand armature and front contact to the circuitextending to the selector time alarm for causing the selector time alarm to operate.
W'hen the steering switch reached position 3, a circuit was established for the answering supervisory relay 370, which may be traced from grounded battery, through the lower left-hand winding of repeating coil 336, winding of relay 370, conductor 371, wiper 243 of the steering switch and its third position contact, and thence to ground through the right-hand non-inductive winding of relay 222. This circuit is maintained through position 9 of the steering switch. Relay 370, upon energizing, establishes a holding circuit for the slow-to-release relay 390 extending from grounded battery through i the right-hand winding of relay 390, frontv contact and armature of relay 370, right-hand armature and alternate contact of relay 390, and thence to ground through the lower left-hand contact of sequence switch spring 314 (l 448 4 The above traced locking circuit holds relay 390 operated after its initial energizing. circuit through the upper left-hand contact'of sequence switch spring 314 (1+10 is opened as the sequence switch 300 is advanced beyond position 10.
When relay 252 deenergizes, a circuit for moving the steering switch from position 4 to position 5 is 5. completed as follows: grounded battery, back contact, armature and'winding of magnet 230, wiper 231 and the fourth position contact with which it is associated, back contact and outer righthand armature of relay 252 to ground.
When the wipers of the steering switch reach position 5,3 circuit is established for the stepping magnet 230 extending from grounded battery, through the fifth position contact of wiper 247, wiper 247, the winding of magnet 230, wiper 231 and the fifth position contact upon which it is resting, and to .ground at the contact controlled by interrupter cam 254 for advancing the steering switch from position 5 to position 6, as soon as the cam 254 makes and interrupts its contact. Upon reaching position 6, the circuit of magnet 230 is again established through the contact of cam 254 and the switch continues to advance under the control of cam 254 into position 8. Upon reaching position 8, a circuit is established for magnet 230 extending from grounded battery, through the eighth position contact of the switch wiper 247, magnet 230, Wiper 231 and the eighth position contact upon which it is resting, conductor 233, and thence to ground through the upper left-hand contact of ,sequence switch spring 389 (9 14-10 1,). The magnet is held energized over this circuit and does not advance the wipers of the steering switch from position 8 until sequence switch 300 leaves position 10 During the time that the steering switch is advancing through positions 3 to 6, inclusive, the tip conductor of the subscribers line is connected to grounded battery for the purpose of' removing any charge that may have accumulated on the line and which might later erroneously affect the testing circuit established; through the testing relay 249. This circuit may be traced from conductor 116 through the lower right-hand contact of sequence switch spring 312 (9%+13 conductor 372, Wiper 242, contacts 3 to 6 over which this wiper passes, to grounded battery. When the steering switch reaches position 7, the winding of the test relay 249 is connected to the tip conductor of the subscribers line, and if, as in the case assumed, the subscriber at substation 7: A of the calling line has initiated the call, the relay 249 will energize over a circuit? which may be traced from grounded battery, through the winding of relay 249, the seventh position contact as sociated with the wiper 242, wiper 242, con. ductor 372, lower right-hand contact of sequence switch's'pring 312 (9 44-13 4;), trunk conductor 116. back contact and intermediate left-hand armature of relay 292, brush 204, contact 200, primary windin of the substation repeating coil 128, switchhook contact 129 and thence to ground through the subscribers call bell 131. Relay 249 energizes in this circuit and as relay 224 is at this time deenergized, establishes a circuit for the switching relay 222 which may be traced from grounded battery, through the lefthand winding of relay 222, conductor 256, front contact and outer left-hand armature of relay 394, back contact and outer lefthand armature of relay 224, and thence to ground through'the armature and front contact of relay 249. Relay 222 energizes in this circuit and establishes a locking circuit for itself extending from grounded battery, through its left-hand winding, front contact and left-hand armature, and lower left-hand contact of sequence switch spring 314 (l 4 18 4), to ground. The previously traced circuit for test relay 249 is main tained through wiper 242 of the steering switch until the steering switch leaves position 8.
With the wipers 'of the steering switch standing on their eighth position contacts, a
circuit is established for advancing the se-' quence switch 300 of the district selector out of position 10. This circuit may be traced from grounded battery through the magnet winding of sequence switch 300, lower righthand contact of sequence switch spring 306 10+l3), front contact and outer right-hand armature of relay 327, (the relay 327 being maintained energized at this time over the fundamental circuit extending through the sender stepping relay 521), eighth position contact upon which wiper 266 of the steering switch is now resting, wiper 266, conductor 248, lower left-hand contact of sequence switch spring 380 (10), and upper right-hand contact of said sequence switch spring (2+18) to ground. Upon reaching position 11, the circuit for advancing the sequence switch is maintained over the righthand contacts of sequence switch spring 307 and the switch advances through the succes sire talking selection positions. Relay 327 is maintained energized in position 11 of sequence switch 300 by a circuit from grounded battery, through its left-hand winding, armature and front contact, lower right contact of spring 310, (UH-17), upper leftcontact of 310 (10+13) outer left-hand contact of relay 325 and thence to ground over the fundamental circuit.
As soon as the sequence switch 300 leaves posit-ion 10 the previously traced energizing circuit of stepping magnet 230 of the steering switch is opened and the magnet 230 advances the wipers of the steering switch out of position 8 and into position 9. In position 9, a circuit is established from grounded battery through the armature, contacts and winding of stepping magnet 230, wiper 231, to ground on the ninth position contact upon which it is resting for advancing the wipers of the steering switch over the ninth position into position 10. In position 10, the trunk conductors 116 and 117 are connected through the wipers 242 and 243 of the steering switch to conductors 372 and 371, and the answering supervisory relay 370 is now maintained energized over the calling subscribers loop.
As the district selector 300 passes through position 10%, a shunt circuit is established in shunt of the windings of the sender stepping relay 521, which may be traced from grounded battery, through the left-hand winding, left-hand armature and front contact of relay 327, lower left-hand contact of sequence switch spring 315 and to ground at the upper left-hand contact of sequence switch spring 315 (7%-|-13 Relay 327 is maintained in this circuit but the sender stepping relay 521 becomes deenergized and in the well-known manner causes the energization of the upper counting relay corresponding to the lower counting relay which was energized upon the initial energization of sender stepping relay 521 in the talking selection position (16) of the sender sequence switch 550. Since, in the case assumed, the No. 0 counting relay 525 was thus initially energized, the No. 0 counting relay 520 now energizes and opens the fun.- damental circuit at its armature and front contact.
The energization of the No. 0' counting relay 520 causes relay 327 to become deenergized since its locking circuit is now open. Relay 327, upon deenergizing, opens the driving circuit of sequence switch 300 and the sequence switch is arrested upon reaching position 11.
After sequence switch 300 leaves position 10, relay 325 is maintained energized to maintain the fundamental circuit closed through the winding of relay 327 until it is interrupted by the No. 0 counting relay of the ofiice sender over a circuit which may be traced from grounded battery through the right-ham] winding of relay 325, upper right-hand contact of sequence switch spring 316 (104-13), front contact and right-hand armature of relay 394, upper right-hand contact of sequence switch spring 333 (10+15), front contar t and inner righthand armature of relay 327, lower righthand contact of sequence switch contact 315 (1+14), upper left-hand contact of sequence switch spring 315 (7%+13 to ground. As soon as the talking selection is completed and relay 327 deenergizes as above described, this holding circuit for relay 325 is opened and relay 325 deenergizes, thereby opening the circuits controlled thereby. At the oflice sender upon the opening of the fundamental circuit the sequence switch of the oflice sender is driven into normal position and the circuits of the sender are restored to normal in the well-known manner.
Upon the setting of the sequence switch 300 of the district selector switch into its talking selection position, the incoming selector switch functions to apply ringing currentand when the called subscriber answers relay 421 deenergizes whereupon the ringing current is disconnected from the called line and the sequence switch 400 is driven from position 14 to 16, all as described in the aforementioned patent to Taggart and Send- As soon as sequence switch 400 reaches position 14, a direct current path is established through the right-hand winding of repeating coil 458, and thence over the called subscribers line for supplying the called subscribers line with talking current. This path may be traced from grounded battery through the lower right-hand winding of repeating coil 458, winding of supervisory relay 459, contact of sequence switch spring 414 (14+16), brush 448 and terminal 449 of the incoming selector switch, brush 480, and terminal 482 of the final selector switch, thence through the called subsrribers substation loop, terminal 486 and brush 484 of the final selector switch, terminal 447 and brush 446 of the incoming selector switch, contact of sequence switch spring 413 (13%+16), and thence to ground through the upper right-hand winding of repeating coil 458. Supervisory relay 459 energizes in this circuit and connects the terminals of the central station battery between the lefthand windings of repeating coil 458 in such a manner as to cause current to flow over the trunk line incoming through the selector switch and the district selector switch in such a manner as to energize the polarized call charging relay 374 at the district selector switch to close its alternate contact. This circuit may be traced from grounded battery over conductor 460, through the upper contact of sequence switch spring 405 (11+16), conductor 426. resistance element 425, upper contacts of sequence switch spring 415 (11'to 16), lower left-hand winding of repeating (oil 4.58, lower contact of sequence switch spring 404 (11-1-16). trunk conductor 420, contact 356 and brush 352 of the district selector switch, upper right-hand contact of sequence switch spring 319 (9-1-14), lower left-hand contact of sequence switch spring 319 (114-13 4). lower righthand winding of repeating coil 336, upper left-hand contact of sequence switch spring 396 (10+11 winding of polarized relay 374, upper right-hand contact of sequence switch spring 395 (104-13 4), up-
per left-hand contact of sequence switch spring 395 (10+11 upper right-hand winding of repeating coil 336, upper lefthand contact of sequence switch spring 31% (114-13 1;), upper right-hand contact of se quence switch spring 318 (9+14), brush 351 and contact 355 of the district selecto switch, trunk conductor 419, upper contac of sequence switch spring 403 (11+16), upper left-hand winding of repeating coil 458. resistance 424, and thence through the armature and contact of supervisory relay 459 t ground.
The calling and called subscribers are now connected over a't-alking circuit with each other, shown on the drawing by heavy lines, the calling subscriber receiving current over the circuit previously traced through the left-hand winding of repeating coil 336, and the called subscriber receiving current over the repeating coil 458.
Upon the energization of polarized relay 374 with the sequence switch 300 of the district selector in talking position 11, a circuit is established for relay 252 as soon as interrupter earn 259 rotates to such a position as to close contacts 260. This circuit may be traced from grounded battery, through the left-hand winding of relay 252, contacts 260, conductor 261, upper and lower righthand contacts of sequence switch spring 324 (11+12), alternate contacts of polarized relay 374 and upper right-hand contact of sequence switch spring 314 (11+13 to ground. Relay 252, upon energizing, locks up through its left-hand winding and outer left-hand contacts to conductor 261, and at its inner left-hand armature prepares a circuit for the call charging relay 365 which is closed upon the advance of the interrupter cam 259 to a position in which its contacts 260 are opened and its contacts 262 are closed. This circuit may be traced from grounded battery, through the right and left-hand windings of relay 365, contacts 262. front contact and inner left-hand armature of relay 252, outer left-hand armature and front contact of relay 252, and thence to ground on conductor 261. Relay 365, upon energizing in this circuit, closes a locking circuit for itself extending through its windings, lower right-hand and upper left-hand contacts of sequence switch earn 305, and to ground at the outer right-hand contacts of relay 365. At its innermost right-hand armature, relay 365 prepares a circuit for charging a call on the calling partys message register as soon as the calling arty restores the receiver to the switchhoo to release the established connection.
Following the termination of the conversation, both the calling and called subscribers restore their respective receivers to their switchhooks and the circuit previously traced through the answering supervisory relay 370 is opened at the switchhook contacts at the calling subscribers station. This relay upon deener'gizing opens the lockneensee I ing circuit of slow to release relay 390, which, after an interval, closes a circuit for driving, sequence switch 300 out of position 11 into position 16. This circuit may be traced from grounded battery, through the winding of sequence switch magnet 300. lower left-hand and upper left-hand contacts of sequence switch spring 323 (11+15), right hand normal contacts of relay 390 and lower left-hand contacts of sequence switch spring 314 (l 448 1,) to ground. Upon the deenergization of relay 390, the circuit previously traced extending through the windings of sleeve relay 398 is opened at the left-hand alternate contacts of relay 390 and relay 398 thereupon releases.
en sequence switch 300 reaches position 13, a circuit is established to the stepping magnet 230 of the steering switch RS for advancing the wipers of the steering switch from position 10 into position 11, which circuit may be traced from grounded battery through the 10th position contact, upon which wiper 247 is resting, wiper 247, winding of stepping magnet 230, wiper 231 and the 10th position contact upon which this wiper is standing, conductor 233, and thence to ground at the upper left-hand contact of sequence switch spring 389 (13+13 This circuit is maintained until the' sequence switch leaves position 13% when stepping magnet 230 deenergizes, advancing the wipers to position 11. In position 11, the talking circuit extending through Wipers 242 and 243 is still maintained in order that a tone signal may be transmitted to the calling subscriber in case the district selector switch had failed to find an idle trunk extending to an incoming selector switch and had therefore moved to its overflow position. This operation of the district selector will be described hereinafter. When sequence switch 300 passes into position 14%, the previously traced circuit for magnet 230 is again established and when the sequence switch leaves position 15 1; the stepping magnet 230 advances the wipers of the steering switch from position 11 to 12, where, under the control of the contact of the interrupter 254, stepping magnet advances the wipers of the steering switch to position 16.
While the wipers of the steering switch are (passing over positions 12 and 13, the tip con uctor of the calling subscribers line is connected over the wiper 242, to grounded battery to discharge the subscribers line and, when passing over positions 14 to 16, the testing relay 249 is again connected to the tip conductor of the calling line to test for an unsta-ndard condition of the line. If the calling line is in a standard condition, no ground is connected at this time, since the calling subscriber has restored his receiver to the switchhook and has thereby 7 this time.
disconnected the ground connection through the call bell 131, as previously described. If, however, the line is in an unstandard condition and either the ringer tip conductors are permanently connected to ground through a stray ground connection, the test relay 249 will become energized at In order that the test may be made both on the tip and ring conductors, theyare bridged together at this time over a circuit extendin from conductor 116 through the lower right-hand contact of sequence switch spring 312 (14 4-1-17). lefthand contacts of charging relay 365 and thence to conductor 1.17 through the lower right-hand contact of sequence switch spring 313 (16).
If the test relay 249 operates on this second test, a holding circuit is established for relay 252 for maintaining this relay energized when the steering switch reaches position 16. Relay 252 is operated over a local circuit while the steering switch was passing from position 9 to 15 which may be trace from grounded battery, through its righthand winding, contacts 9 to 15 over which the wiper 266 passes, wiper 266. conductor 248 and thence to ground through the lower left-hand contact of sequence switch spring 380 (15 to 18) and upper right-hand contact of said spring (2+18) to ground. The
' holding circuit for relay 252 may be traced from grounded battery. through its righthand winding, outer left-hand armature and front contact of relay 224 and thence to ground at the armature and front contact of relay 249. )Vith relay 252 operated when the steering switch RS reaches position 16, the steering switch is arrested in position 16 and the circuit is established to the selector time alarm extending from ground on conductor 248, wiper 266, the 16th position contact upon which the wiper rests and over conductor 264 to the selector time alarm.
The operation of the selector time alarm warns the switchboard attendant that an unstandard condition obtains on a connection that has been established through the particular district selector switch with which the time alarm is associated. The operation of relay 249 at this time prevents the registration of the call upon the message register of either of the parties on the calling line, and therefore prevents the registration of a call on the register of the party A when the party A may not have been the calling arty. 1
If the test relay 249 does not operate on the second test, relay 252 will not be held energized when the steering switch reaches position 16 and the steering switch will, therefore, be advanced out of position 16 by a circuitextending from grounded battery, through the back contact, armature and winding of stepping magnet 230, wiper 231,
the wipers of the steering switch have reached position 17 they are advanced into position 20 through the operation of interrupter cam 254 in the manner previously described.
As the steering switch RS passes through positions 17 18 and 19 and with relay 222 operated as previously described, relay 296 will be shunted down by. a path including grounded battery, resistance 250, inner right-hand contacts of relay 222, 17th, 18th and 19th position contacts a of wiper 266, wiper 266, conductor 284, lower left-hand contact of sequence switch spring 380 (15+18) and ground at the upper right-hand contacts of said spring (2+18), causing the-release of relay 398 and the cut-off relay 103, associated with calling subscribers line. The circuit for operating the message register associated with the callin line is then completed over a path extending from ground, through the message register magnet 123, back contact and outer right-hand armature of relay 103, back contact and outer righthand armature of relay 102, contact 203 and brush 207, resistance 297, contacts of relay 279,- outer right-hand alternate contacts of relay 222, inner right-hand normal contact of relay 252, lower left-hand contact of sequence switch spring 381 (16), upper lefthand contact of said spring (11-1-16), and inner light-hand contacts of charging relay 365 to grounded battery. The message register now operates in a manner well known in the art and registers a call against the calling party A.
If station B had been the calling station, relay 249 and consequently relay 222 would not have energized in position 7 of the steering switch RS. Relay 296 will not be shunted down in positions 17, 18 and 19 of the steering switch and relay 398 will remain operated. The circuit for maintaining relay 398 operated includes grounded battery at the inner right-hand contacts of relay 365, upper left-hand contacts of sequence switch spring 381 (11-1-16), winding of relay 398, outer left-hand contacts of relay 296, righthand normal contacts of relay 299. segment 284 and ground at brush 281. Since relay 398 is held at this time, relay 103 remains operated. The circuit for operating the message register may be traced :trom ground, through the message register 144, front contact and right-hand armature of relay 103,
outer armature and back contact of relay 102, contact 203, brush 207, resistance 297, outer right-hand normal contacts of relay .222, inner right-hand contacts of relay 252,
lower left-hand contacts of sequence switch spring 381 (16). upper left-hand contacts of said spring and inner right-hand contacts of relay 365 to grounded battery. The message register then operates inla manner well known in the art and registers a call'againsi' the station B. 7
During the advancement of the wipers of the steering switch from sition 16 to 20, this battery is supplied or operating the message register, the movement of the steering switch leaving suflicient time for the operation of the registers. When the steering switch reaches position 20, a circuit is established for advancing sequence switch 300 out of position 16 into position 17, said circuit extending over a path from grounded battery, through the winding of sequence switch magnet 300, lower left-hand contact of sequence switch spring 306 (16), back contact and outer right-hand armature of relay 327, 20th position contact associated with wiper 266, wiper 266, lower left-hand contact of sequence switch spring .380 (15+18), and upper right-hand contact of said spring (2+18) to ground. In position 17, the sequence switclr300 isadvanced to position 18 under control of spring301. With sequence-switch 300 in position 18, a circuit is established for advancing the steering switch into position 21, which circuit may be traced from grounded battery, through the back contact, armature and winding of the stepping magnet 230, wiper 231, the twentieth position contact with which it is associated, lower right-hand contact of sequence switch 323 (18), upper lefthand contact of said spring (118) right-hand normal contacts of relay 390, thence to ground to the lower: left-hand contact of sequence switch spring 314 (1 448 4).
With sequence switch 300 in position 18 and the steering switch in position 21, a air cuitis now established for the downdrive magnet 376 of the district selector switch, which may be traced from grounded battery, through the winding of magnet 376, conductor 377, the 21st position contact with which wiper 266 is in engagement, wiper 266, conductor 248, lower left-hand contact of sequence switclrspring 380 (15+18) and upper right-hand'contact of said spring (2+18) to ground. The down-drive magnet 3T6 upon being energized, presses the depending portion aof the switch shaft, not shown, against the constantly rotating down-drive drum, not shown, whereby the switch shaft is driven downwardly into the normal position in a manner well known. WVhen the switch shaft. reaches its normal position, the brnsh 360'engages the normal segment 379 of the switch commutator and a circuit is established for advancing the steering switch into position 22. This circuit may be traced from battery through the armature, contact and. winding of magnet 230. wiper 231, 21st position contact with which the wiper 231 is in engagement, 21st menses position contact with which the'wiper 291 is in engagement, normal segment 379, brush 360, conductor 344, and thence to ground through the lower right-hand contact of sequence switch 314 (8+6); In position 22, an obvious circuit is completed through wiper 231 for driving the steering switch into. normal position. With the steering switch in normal position, a circuit is now established for driving sequence switch 300 into normal position which may be traced from grounded battery, through the magnet winding of sequence switch 300, upper righthand contact of sequence switch spring 306 (4+18), the normal or No. 1 contact with which wiper 291 of the steering switch is in engagement, wiper 291, normal segment 379, brush 360, conductor 344 and thence to ground through the lower right-hand contact of sequence switch spring 314 (8+6).
and with relay 390 deenergized, a circuit for relay 27 0 was completed over a path extendin from grounded battery, through the left-hand normal contacts of relay 27 0, through the left-hand normal contacts of relay 390, lower and upper lefthand contacts of sequence switch 324 (17-1-18), left-hand winding of relay 270, segment 284 of the switch LF and brush 281 to: ground. Relay 270, in operating, starts the down-drive of the line finder switch LF. Relay 270, in attracting its outer right-hand armature coinpletcs an obvious circuit through the lefthand winding of relay 292 causing the energization of said relay 292. Relay 292, in operating, holds the tip and ring talking conductors 116 and 117 open during the down-drive. When the commutator brushes 280 to 282 inclusive of the switch LF are returned to normal position, the circuits for relays 270 and 296 are opened causing the release of said relays.
As the sequence switch 300 leaves position 18 the circuit for relay 298 is opened at the lower lefteha-nd contacts of sequence switch spring 314 (l 448 1;) and if relay 296 is released at the end of the down-drive movement of the line finder, relay 298 will become deenergized.
As soon as sequence switch 300 of the district selector switch leaves position 14, the circuit for the relay 421 associated with the incoming selector switch is opened,
whereupon said relay 421 releases and causes the restoration of the incoming selector to normal, after which the final selector is restored to normal in the manner described in the aforementioned Taggart et alcpatcnt.
WVith sequence. switch 300 in position 18 comes deenergized, opening the circuit of up-drive magnet 338 and establishes the previously traced circuit for driving the sequence switch 300 out of position 7 and into position 8. In position 8, relay 327 becomes energized over a local circuit extending from grounded battery, through its righthand winding, upper left-hand contact sequence switch spring 304 (8+9), upper right-hand contact of sequence switch spring 305 (1+9), upper left-hand contact of said s ring (8+16 A), and the outer right-han contacts of relay 365 to ground, and closes at its outer right-hand armature and front contact, a circuit for driving sequence switch 300 out of position 8 and into position 9. In position 9, relay 327 is maintained energized over the previously traced circuit. A circuit is now established for driving sequence switch 300 out of position 9 to position 10 which circuit may be traced from grounded battery, through sequence switch magnet 300, lower left-hand sequence switch spring 311 (9), upper left-hand con tact of spring 311 (9+13), conductor 343, commutator segment 342, brush 341, conductor 344, and thence to ground through the lower right-hand contact of sequence switch spring 314 (8+6). When sequence switch 300 reaches position 10, a circuit is established for relay 327 which is traced from grounded battery, through the lefthand winding of relay 327,1ower left-hand contact of sequence switch spring 310 (10), upper left-hand contact of sequence switch spring 311 (9+13), conductor'343, commutator segment 342, brush 341, conductor'344 and thence to ground through the lower right-hand contacts of sequence switch.
spring 314 (8+6). The steering switch has at this time positioned its wipers on the No. 8 contacts of its banks in the manner previously described and a circuit is established through the outer right-hand armature and front contact of relay 327 for driv-- ing sequence switch 300 out of position 10. When the sequence switch leaves position 10. the energizingcircuit of relay 327 previously traced is opened at the lower lefthand contact'of sequence switch spring 310 but relay 327 is maintained locked up over its left-hand armature and front contact, the lower right-hand contact of sequence switch spring 310g(10+17), upper lefthand contact of spring 311 (9+13), conductor 343, segment 342, brush 341, to ground at the contact of sequence switch spring 314 (8+6), until the sequence switch advances into position 14 when the circuit of relay 327 is opened and relay 327, upon deenergizing, closes a circuit for driving sequence switch 300 into position 15. This circuitmay be traced from grounded battery. through the magnet winding of sequence switch 300, lower left-hand contact of sequence switch spring 306 (14) back contact and outer right-hand armature of relay 327 and thence to ground through the upper right-hand contact of sequence switch spring 307 (11+15).
As previously described, when sequence switch 300 passes out of position 10, the steering switch RS advances to position 10, the talking position, and as sequence switch 300 passes out of position 13% the steering switch BS is further advanced to position 11. Since now the district selector switch has moved to its overflow position and the sequence switch 300 is standing in position 15, a circuit is established for applying tone current to the right-hand winding of repeating coil 336 from the source of tone current 368, through the left-hand contacts of sequence switch spring 319 (15), lower right-hand winding of repeating coil 336, condenser 399, lower left-hand contact of spring 395 (15), upper left-hand contacts of spring 333 (14+15), upper right-hand contact of said spring (10+15), lower righthand contact of spring 382 (15+18), upper left-hand contacts of said spring (13+15), right-hand alternate contacts ofrelay 390 and lower left-hand contact oi sequence switch spring 314 (l +1 8 to ground.
This tonecurrent is inductively transmitted over the calling subscribers line through the left-hand windings of repeating coil 336, the supervisory relay 370 and the wipers 242 and 243 of the steering switch. The calling subscriber receiving this tone is apprised of the fact that it is impossible to obtain the desired connection at this time and therefore restores his receiver to its switchhook to release the connection.
What is claimed is:
1. In a telephone exchange system, a calling telephone line, a plurality of stations thereon, a message register for each station of the line, automatic switching means for extending a connection from the calling line, a circuit for operating the message registers, means common to a plurality of lines for testin the calling line to determine which station of the party line is calling, a switching device individual to the calling line controlled by said testing means for extending said circuit to the message register corresponding to the calling line, and; means for closing said message register circuit to actuate said register.
2. In a telephone exchange system,a calling telephone line, a plurality of stations thereon, a message register for each station of the line, automatic switching means for extending a connection from the telephone line, a circuit for operating the message registers, means common to a plurality of lines for testing the calling line to determine which station of the party line is calling, electromagnetic means individual to the
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