Patent GB-422922-A (GB)
Title: Improvements in and relating to electric telegraphy
IPC: H04L25/20
Filed: 1933-07-18
Abstract: 422,922. Code telegraphy. OSTI, A. L., and MARTINATO, C. E., 46, Via Calabria, Rome. July 18, 1933, No. 20302. Convention date, Jan. 5. [Class 40 (iii)] In a reperforating receiver the punches are actuated by cams driven by a phonic motor. Cable-code perforator and retransmitter. The dot magnet or dash magnet a, Fig. 1, when energized lifts the interponent c into the path of the hammer e, operated by the cam d, so that the punch f for dot or dash as the case may be is operated. A centre hole is punched at each revolution of the cam d, simultaneously with the dot or dash hole if any. A tape-feed cam s<1>, Fig, 2, on the same shaft rocks the levers y and so rocks a threearmed lever n about its knife-edge pivot o to operate the feed wheel t. Retransmission of regenerated signals is effected, Fig. 3, by the dot relay p and dash relay l, through dot and dash contacts k (of which the dot contact only is shown) closed by the operation of the interponents c, Fig. 1. The contacts k control operating windings p<1>, l<1>, respectively, and the outgoing signal endures until hold-on windings p<2>, l<2>, are broken at j by cam s, Fig. 2, acting on roller u, Fig. 3. The armatures which control the sending-on relay r are restored by biassing windings p<3>, l<3>. The timing of the cam s may be such as 'to produce block signals (Fig. 5, not shown) or detached signals (Fig. 4, not shown). Translating from cable code to Wheatstone morse code. Incoming cable-code signals applied to apparatus of the above type can be made to punch Wheatstone slip. The punch blocks are replaced by punch blocks of the Wheatstone type, and the tape-feed arrangement is controlled by a magnet B, Fig. 7, which is energized simultaneously with the dash magnet of the receiver. In the absence of a dash signal, the part F of the stop D limits the movement of the tape-feed lever E, Figs. 6, 7, and the tape is fed by only one centre hole. If, on the other hand, a dash signal is being received, the magnet B withdraws the stop D so that it latches as shown as G, Fig. 8 ; the tape-feed lever E can then move through a distance equivalent to two centre holes, and at the end of its travel it releases the stop D as shown in Fig. 9. The magnet B may be omitted, and its function be performed by the dash relay. Wheatstone morse perforator and retransmitter. Separate cams S<1> and VW, Fig. 11, are provided for perforating the upper and lower holes respectively, together with a tape-feed cam A. When the received signal begins, armature R, Fig. 10, of the receiving relay closes a charging circuit through condenser C<1> and energizes polarized neutral relay h<1> so as to bring about the operation of the upper-holes punch S. When the received signal ends, the condenser discharges and energizes relay k<1> so as to bring about the operation of the lower-holes punch I. In the case of a dot, this punch is operated by cam W before the tape-feed cam A has acted ; in the case of a dash, the punch I is operated by cam V after the action of the tape-feed punch A. Retransmission may be effected by a double-wound sending-on relay having one winding in series with each of the magnets p<1>, k<1> (Fig. 13, not shown). Translating from Wheatstone to cable code. A retransmitter for this purpose, Fig. 14, is provided with a restoring circuit having a contact m<1> which is closed once per dot period. When a dot signal is received, the condenser C<1> is charged and discharged before the operation of the restoring contact ml, so that relay p<4> and consequently the dot magnet H are actuated. When a dash signal is received, on the other hand, relay k<1> has been restored by the operation of contact m<1> before relay h<1> is operated by discharge of the condenser ; hence relay l<4> and dash magnet K are operated. The relays p<4>, l<4>, are eventually restored by the punch-operated contacts a<2>, b<2>. Specification 274,186, [Class 40 (iii)], is referred to.