Patent GB-844951-A (GB)
Title: Register-sender system employing magnetic storage
IPC: H04Q3/42
Filed: 1957-05-03
Abstract: 844,951. Automatic exchange systems. GENERAL TELEPHONE LABORATORIES Inc. May 3, 1957 [May 21, 1956], No. 14241/57. Class 40 (4). In response to the dialling of code digits the corresponding routing digits are registered simultaneously on the spokes of a magnetic wheel, the numerical digits being registered sequentially as they are dialled. General description.-When a subscriber closes his loop he seizes an idle code selector. After receiving dialling tone he dials two code digits and four numerical digits. The code digits operate the wiper 112 of a two-motion code selector, the contacts of which are connected to a rectifier translation network, Fig. 2, to translate the code into up to seven routing digits. These routing digits are simultaneously registered on magnetic discs 200, 210, 220, 230, Fig. 3. The numerical digits are pulsed into relay 250 and are also registered on the discs. The stored digits are then pulsed to line. Detailed description.-The magnetic discs, Fig. 3, are of the type described in Specification 805,599, and are arranged on a common shaft, each disc comprising 12 reversible magnets arranged as spokes. Each digit is registered on a row of four spokes according to the WXYZ code. Seven coils such as 201-207 associated with each disc are also associated with the translator. When wiper 112 of the code selecting switch, Fig. 2, has been set ground is applied at contact 111 to energize coils associated with the discs appropriate to the rectifier connections, such as 120, 121, in the translation field. These coils reverse the polarity of the associated magnetic spokes. The four numerical digits are then pulsed into relay 250 to set wipers 321, 322. At the end of each digit these wipers are grounded to energize one or two of coils 208, 218, 227, 238 to register the digit. Relay 280 restores to step wipers 321, 322 to home position. At each digit when 280 energizes motor magnet 240 also energizes. When 280 restores 240 also restores to advance the discs one step. When the last numerical digit has been stored the row of spokes bearing the first routing digit is opposite sensing magnets 209, 216, 225, 236 and operates one or two of the related contacts as described in Specification 805,599. Relay 470 operates and releases continuously at dialling speed. When 470 is normal operation of 300 energizes 460, which locks up and passes the first impulse to line. As each impulse goes to line wiper 484 steps in a counterclockwise direction under the control of 470. When wiper 484 reaches the contact corresponding to the digit to be sent relay 440 pulls up followed by 450 and the conductors 17, 18 of the line are shunted to stop transmission. When pick-up contacts such as 209<SP>1</SP> are attracted by a magnetic spoke various contacts associated with wiper 484 are grounded through resistors 495-498. When the wiper reaches the contact corresponding to the selected digit marginal relay 440 pulls up due to the combined current through two of the resistors. Relay 460 then falls back to operate 450 slowly. Relay 410 then energizes followed by 240 and drives wiper 484 home. Relay 450 completes the erasing circuit and restores 240 to advance the storage discs one step. Less than seven routing digits.-In this case the digits are stored on the spokes immediately preceding those bearing the numerical digits. The absence of a digit leaves relay 420 normal so that 430 operates to cause 240 to advance the discs until a digit is encountered.