Matrix for producing electric pulses

1,099,512. Repertory dialler. WESTERN ELECTRIC CO. Inc. March 22, 1965 [March 20, 1964], No. 12017/65. Heading H4K. [Also in Division H2] A repertory dialler, whieh transmits impulsetrains according to digits encoded upon successive rows of a punched card, contains a programme controlled switching matrix whose initial setting for each digit by the punched card determines the number of impulses transmitted by fixing the position in the programme sequence at which impulse transmission is stopped. The card after being inserted into the dialler is ejected bit by bit as dialling proceeds: each row of punched holes corresponding to a digit and being mechanically sensed in turn to set particular pairs of make and break contacts A 1 A 2 to G 1 G 2 of a switching matrix 220 (Fig. 16). The remaining contacts A to F are provided by spring contacts co-operating with tracks upon a printed circuit disc (Fig. 12) which for each digit row sensed rotates from an initial position to operate the make contacts according to the programme provided by the printed pattern. Rotation continues until the occurrence of a path through the matrix operates relay K to remove the drive from the disc. Impulse springs co-operate with tracks P 1 P 2 to transmit a number of impulses according to the extent of rotation which is dependent upon the initial setting of the matrix by the particular row of the punched card. The disc is returned to its rest position by a spring during which time the relay SH short circuits the line. The card upon insertion into the dialler winds a spring which effects its ejection during dialling: the movement being controlled by relay K and an escapement-pawl mechanism. Such movement takes place in two steps, the first of which breaks all the code contacts A 1 A 2 to G 1 G 2 by suspending the mechanical sensing probes between rows and the second step of which places the probes in the next digit code row. For use with a PBX or for use with numbers with fewer digits than 14, a position in each row of punched holes is perforated to effect a stop. Thus when, for a PBX subscriber, 9 is first dialled for an outside line it is necessary for the transmitter to halt until the necessary dialling tone is received. On receipt of dialling tone the start button is again pressed to continue transmission.

Automatic code transmitter utilizing a code bearing medium having bits of information

Character generation matrix

Automatic telephone dialing system

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Automatic telephone dialing system