Patent GB-317458-A (GB)
IPC: H04L5/22
Filed: 1928-09-28
Abstract: 317,458. Western Union Telegraph Co., (Assignees of Dirkes, R. F., Kimball, V. R., and Long, J. W.). Aug. 18, 1928. [Convention date]. Distributor systems.-A distributor multiplex telegraph has means in each channel for storing received signals in order to operate a simplex printer. Receiver, Fig. 1. Incoming signals operate a relay LR, the tongue of which supplies impulses through a distributor brush and receiving segments RR to neutral relays M - - R which complete circuits respectively through operating- windings 5 of polar relays A - - F. The relays M - - R also complete holding- circuits through contacts 3 and a battery Ba. Armatures 7 of the energized relays A - - F are moved to the right and impress a negative or marking potential on segments 1 - - 6 of simplex rings SR. The tongue of a relay G is also moved to the right, as its operating-coil 6 is in series with the relays A - - F and is operated when any of the latter is energized. The relay G thus causes the tongue of a cut-off relay H to move to the right, when the brush of local segments rings LS passes over a segment 12, and place a positive potential on a start segment 8 of the simplex rings. As the brush passes over the start segment a positive impulse is transmitted to a printer PR through relays K, L to start the printer operating. On further rotation of the brushes, the brush associated with the local segments rings impresses a positive impulse on a segment 15 to operate a release relay S and open the holding- circuits of the relays M - - R. On further rotation marking impulses are transmitted to the printer as the brush associated with the simplex rings passes over the contacts 1--6. As the brush passes over a rest contact 7, a negative impulse is transmitted to the printer to synchronize it. As soon as a marking impulse is transmitted from a segment 1 - - 6 of the simplex rings, the brush on the local rings makes contact with a segment 18, 21, 24, 4, 6, or 9 to connect positive battery to the lefthand winding 9 of the corresponding relay A - - F to move the corresonding tongue to the spacing- position. A segment 17 is provided for returning the relay G to its left-hand position after the start impulse has been transmitted. If no signals are received from the line, the relays A - - G remain on their left-hand contacts and the local impulse from the segment 12 moves the relay H to the left to deprive the start segment 8 and the left-hand contacts of the relays A - - F of positive or spacing potential. Thus the only potential on the simplex segments is the negative potential on the rest segment 7 which throws the armatures of the relays K, L to the right or marking position where they remain until they receive a spacing-impulse. Transmitter, Fig. 2. Contacts SH, 1 - - 5 are controlled by a perforated tape or other means and, on selection, move from the right or spacing side to the left or marking side to connect the right-hand coils 5 of the polar relays A - - F to the marking bus-bar. When the brushes pass over a segment 11 of the local ring, a make-relay P' is energized and connects a battery to the tongues on the marking bus-bar and hence to the corresponding relays A - - F and the relay G to actuate their tongues to the right side. Corresponding simplex ring segments 1 - - 6 are thus furnished with negative, or marking potential, and, on the passage of the local brush over the segment 12, the unactuated relays and the start segment 8 are furnished with positive or spacing potentials. On the passage of the local brushes over a following segment 14, a relay Q<1> is operated to break the locking-current on the relay P' and disconnect the battery from the marking bus-bar. As the brush passes over the local ring segment 15, a make-relay N<1> closes a circuit to energize a transmitter magnet R and steps the perforated tape to the next selection. The relay N' is deenergized by the removal of its locking-current by a relay O<1> when the brush passes over a local segment 20. The relays are returned to their spacing contacts, and the simplex printer is stopped if a selection is all spacing, as described in connection with the receiver. The invention may be applied to start-stop distributors.