Patent GB-524364-A (GB)
Title: Improvements in or relating to electrical storage equipment such as that used in telecommunication exchange systems
IPC: H04M3/36
Filed: 1939-01-28
Abstract: 524,364. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. WRIGHT, E. P. G., and PETERS, G. E. Jan. 28, 1939, No. 3000. [Class 40 (iv)] A digit &c. register comprises a number of storage devices such as condensers having two operated conditions and a neutral condition so that the digit &c. can be stored in duplicate firstly by the setting of some of the devices to one operated condition and secondly by the setting of the remainder of the devices to the other operated condition. The invention is described with reference to an automatic ticketing machine comprising arrangements as described in Specifications 511,695 and 517,296, and comprising means which form the subject matter of divided Specification 524,497 for dealing with digits which have been faultily registered. Registering digits. Positive and negative potentials applied at the end of each digit to the contacts of a 25-point switch CR, Fig. 1, set by the digit control the condition of 4-condenser registers connected up in turn by a sequence switch CS. Each digit is identified by an arrangement of one, two or three positive charges amongst the four condensers of a group. The remaining condensers of the group are charged negatively forming a duplicate record of the digit. At the termination of a connection, the registers are connected in turn by a switch CH, Fig. 2, to polarized relays VA-VD which are operated in accordance with the condition of the registers and transfer their settings to relay registers AN, AP ... DN, DP, EN, EP ... HN, HP &c. with the help of sequence relays SA ... SC. The digits are then translated into the corresponding exchange name as described in Specification 511,695 and the letters and digits are routed to the printer described in Specification 517,296. Assuming that each condenser in every register is charged, relays DA ...DC prevent the operation of relays XA ... XC and consequently that of relay FX. If through some fault in the storage, a condenser of one register is not charged, relay FX is operated to prevent setting of the translator switch and to render effective printer control circuits PCC1, PCC2, PCC3. Similarly if two registers are faulty set XD pulls up. If FX is operated PN is energized when the third digit is received to cause the connection of ground to terminals P1 ... P4 in turn by a sequence switch or the like (not shown) controlled from the printer. If XD is up, indicating that two digits have been registered wrongly, circuits are made to cause the printing of a stroke followed by three letters X. If however only one digit is wrongly registered and if the first digit was registered correctly a marking circuit is now made to cause it to be printed without translation. If not, the fact that XA is up causes a stroke to be printed instead. When P2 is grounded, if the first letter was faultily registered, the value of the digit or a code letter representing possible. values is printed. Similar arrangements are made in the other position so that the incorrectly registered digit appears in the record as a stroke followed by its value or a code letter representing possible values. Numerical digits are transferred in turn to the JN ... MP register for printing after the exchange digits have been printed and finally a record is made of the identity of the storage circuit by which the printer has been controlled.