Patent GB-154313-A (GB)
Title: Improvements in or relating to telegraph printing systems
IPC: H04L25/42
Filed: 1919-08-22
Abstract: 154,313. Automatic Telephone Manufacturing Co., Harrison, H. H., and Smith, S. R. Aug. 22, 1919. Multiplex telegraphs; synchronous movements; type-printing telegraphs.-A type-printing telegraph system comprises a continuously-operated transmitting distributor, an independently controlled signal determining device and means for storing the determined signals and for transferring them to the distributor at instants determined by the joint action of the signalling'determining device and the distributor. The received signals are stored and transferred to the printer by the joint action of the distributor and printer. Stroboscopic means are provided for synchronizing the motors at the transmitting and receiving stations. The operation of a character by CKL, Fig. 1, selectively energizes,. positively and negatively, the segments PS of a rotary distributor TD, connects a starting segment SS to a battery B<4>, and earths one side of a condenser K charged from a battery B<5>, and the key is locked in its operated position by a latch LH and a frame LF. The subsequent engagement of a brush CBA<2>, on the rotary arm of the distributor with the segments CMS<1> completes the discharging circuit of the condenser K through the left-hand operating winding of the switching-relay SR the armatures 1<1> and 2' of which are held in their operated positions by the right-hand winding of the relay energized from a battery B<3>. The armature I<1> of relay SR disconnects the line L from the negative pole of a battery B<3> and connects it to the ring S' of the distributor TD. After a short period the brush CBA<1> engages the starting segment SS through which a positive starting impulse for the receiver is sent to line L from the battery B<4>, and the further rotation of the brush CBA<1> connects the segments PS successively to line L to transmit the selecting impulses. The brush CBA<2> then closes at the segments CMS<2> the circuit of the battery B<2>, unlocking relay ULR and the release magnet LM, the circuit being completed through the armature 2' of relay SR. The relay ULR operates to break the circuit of the holding winding of the relay SR and the magnet LM unlocks the key CKL. The holding of the key CKL by the operator does not affect the operation, since the condenser K is discharged. A further locking device is provided to prevent the operation of a second key before the first is released. With a slight modification of the transmitter distributor, the invention may be used with a Baudot keyboard. The polarized line relay LR, Fig. 2, at the receiving station is normally energized by negative current, and its armature under this condition connects positive battery to the segment S<5>. The receipt of a positive starting impulse by the relay LR connects negative battery to the segment S<5>, thereby energizing the starting magnet SM to release the brush-arm CBA<3> of the receiver distributor RD. The brush-arm CBA<3> moves slightly faster than the arm CBA<1>, Fig. 1, and as it passes over the segments 1 - - 5 it energizes the polarized relays SPR<1> - - SPR<5> in accordance with the impulses received by the relay LR. The relays SPR<1> - - SPR<5> are of the type whose armatures remain in their operated positions, and their armatures are operated in one direction or the other in accordance with the kind of current on the line. The relays energized with positive current prepare the circuits of the corresponding setting magnets SM<1> which are energized from a battery B<6> when the brush-arm CBA<3> bridges the segments S<3>, S<4> and when a switch CM controlled by a cam DC is closed. The relays SPR' - - SPR<5> are provided with resetting windings the circuits of which are controlled by a relay RR which operates after the setting magnets to prevent the reprinting of a letter. In the four channel multiplex system shown in Fig. 4, the phonic wheel MPW drives the receiving distributor, a commutator PMDC controlling the phonic wheels PW<1> - - PW' driving the printers P<1> - - P<4>, and a commutator SC<2> which, with its brushes BH' - - BH' replaces the segments S', S', Fig. 2. Fig. 5 shows the invention applied to the system shown in Fig. 1 of Specification 121,914. When station B, Fig. 5, wishes to start, the switch BSS is moved to the position shown and a character key BK is depressed to energize the starting magnet BTSM. The initial movement of the brusharm of the distributor BTD disconnects the line relay BLR from the line and connects a positive battery to line to energize the line relay ALR at station A. The operation of relay ALR connects positive battery to the inner segment of the distributor ARD to energize the starting magnet ARSM, and the distributor ARD rotates to actuate the storage relays ASR as previously described. After the outer brush on the arm of the distributor BTD has swept over the segments PS, it engages a segment PS' at the same moment as the brush on the arm of the distributor ARD engages the segment PS". The operation of line relay ALR connects positive battery through segment PS" and switch ASS to starting magnet ATSM, and the distributor ATD operates to transmit signals to relays BSR through distributor BRD. If the switch BSS be moved to its lefthand position, the apparatus continues to operate. In the modified receiving arrangement shown in Figs. 6 and 7, the segments of the distributor are connected to five magnets 11 - - 15, the pivoted armatures 16 of which normally engage stops 17 on contact strips 18 to separate them from cooperating contacts 20. The selectively energized magnets 11 - - 15 operate their armatures 16 to lower the corresponding strips 18 upon a bar 19, and the armatures 16 are held in their attracted positions by stops 17. A magnet 21 is then energized through the distributor segments and the cam-operated contacts, to lower the bar 19 and allow the selected strips 18 to simultaneously engage their contacts 20 to selectively energize the setting magnets of the printer. The de-energization of the magnet 21 allows the bar 19 to reset the strips 18. The motor driving the distributor TD, Fig. 1, is synchronized with the motor M', Fig. 2, driving the distributor RD by a commutator switch SC, positive and negative batteries SB<1>, SE<2> and a second position for the switch SS'. When the switch SS', Fig. 2 is placed in its left-hand position, positive and negative supplied to the line relay LR from the batteries SB<1>, SB<2> causes the batteries associated with the relay LR to be successively connected to a lamp SL', and when the motor M' is run up to synchronous speed an apertured disk SD<1> appears stationary. The motor M<2> is synchronized with the motor M<1> by means of a commutator switch, lamp SL<2>, and disk SD<2>. Specification 121,914 is referred to.