Patent GB-851854-A (GB)
Title: An electronic distributor
IPC: H04L13/14
Filed: 1956-11-06
Abstract: 851,854. Electrical distributers; type-printing telegraphy. MONROE CALCULATING MACHINE CO. Nov. 6, 1956 [Feb. 21, 1956], No. 33911/56. Class 40(3). A distributer for producing a plurality of uniformly spaced pulses comprises first and second single timed pulse generators with an output from the first generator triggering on the second generator and an output from the latter triggering on the first generator and the pulses are derived from an output connection of one of the pulse generators. A timing or counting circuit in its rest condition inhibits the operation of one of the generators, but conditions a gate to pass a start pulse to effect operation of the other generator. The timing circuit, when operated removes the inhibiting control from the associated generator and closes the gate to incoming pulses applied thereto. The arrangement is described for the production of sampling pulses for equi-unit code signals fed to or derived from a teleprinter. In the rest condition of the distributer, a counter 36 in its zero position provides a potential which over conductor 106 inhibits generator 22 and over conductor 104 provides one input for a gate 54 which is closed by the stop element, inverted at 52, but which opens in response to the inversion of the start element so that a pulse passes over conductor 100, buffer 30 and differentiating circuit 38 to step the counter 36 to position 1 and over buffer 28 and differentiating circuit 24 to trigger generator 20 producing a positive-going pulse at the end of 11 m.secs. When counter 36 moves from its zero position it no longer provides the inhibiting potential on conductor 106 and a positive pulse produced at the trailing edge of the pulse from the generator 20 by differentiating circuit 26 triggers the generator 22 also producing a pulse which is positive-going at the end of 11  m.secs. This pulse is passed through buffer 32 to differentiator 24 producing at its trailing edge a positive pulse which triggers generator 20 so that at differentiator 26, after a lapse of 11 m.secs., a second positive operating pulse is provided for the generator 22. The pulses passed to the differentiator 26 are also passed to the differentiator 40 to produce the sampling pulses I, occurring at 11, 33, 55, 77 m. secs. from the beginning of the start element. The pulses passed to the circuit 24 are also passed via differentiator 38 to the counter circuit which is restored after seven steps to its home position in which it provides a potential to inhibit the generator 22 and also a potential to open the gate 54 when the reversal of the next start impulse provides the second input to the gate. In a modification, Fig. 4 (not shown), the counting circuit 36 of Fig. 2 is replaced by a timing circuit which in its normal condition, as in the case of the counter, inhibits the generator 22 and provides a potential for gate 54 to be opened by the start pulse. The timing circuit, operated by the start pulse and arranged to have a period between 132 and 143 m. secs., removes the inhibition from the generator 22 and the biasing potential from the gate 54 so that the generator 20 is able to produce a train of seven sampling pulses spaced at 22 m. secs. and commencing at 11 m. secs. from the beginning of the start element of the code combination.