Patent GB-397865-A (GB)
Title: Improvements in or relating to electrical remote control indicator installations
IPC: H04L12/18
Filed: 1932-02-22
Abstract: 397,865. Electric signalling systems. SCHEIDEGGER, H., 3A, Hohenzollernstrasse, Wansee, near Berlin. Feb. 22, 1932, No. 5302. [Class 40 (i).] In a system in which one of a number of groups of indicators can be selected from a remote point and the indicators of the group set to a required indication, the selection and each setting is effected by a single pulse of current over a combination of wires, the various pulses being distributed by a rotary distributer to groups of receiving relays which prepare circuits for test relays, the best relays being operated as the respective indicators reach their final positions. The indicators move to their new positions by the shortest route, the route being determined either by the indicator or, if more than one display board is provided, by a subsidiary transmitter associated with one display board which transmits signals to the other boards indicative only of the direction and extent of the motion required. The transmitter may be operated by a perforated strip or by a hand-operated keyboard sender of the type used in telegraphy, the sender being arranged to work either directly to line or to operate the perforating magnets of the strip. The invention is described as applied to a system for setting price indicators on a stock exchange indicator board. General operation. The general layout of the system is indicated in Fig. 5. A number of boards A1, A2, on which the stock prices are displayed are connected by cables to the perforated tape transmitter S1 and the handoperated keyboard type transmitter S2. The key Tr is used to connect S1 or S2 to the system as required. A series of code impulses are sent to the various boards, the first code selecting the particular indicator group required and the remaining impulses indicating the new indication. The drums rotate to their new positions by the shortest route. An indicator group can be selected whilst the drums of a previous selection are still moving, the lamps KL being lit and, if S1 is in use, the mechanical transmission stopped, when the new code has been registered, until the moving drums have reached their new positions. As shown in Fig. 11, the board A1 only is controlled directly from the senders, this board being provided with equipment to determine the direction and extent of movement of the drums and transmitting, through S3, indications of the movement required to the remaining boards A2 .. A5. Construction of indicators. The final indicators, shown in Fig. 6, comprise drums having the numerical indications on their periphery, the drums being driven by magnets DO, DN through pawls K1, K2. The drums carry wipers In moving over stud contacts which indicate the position of the drums so that the direction of rotation to move the drums to their new positions can be determined and so that they can be stopped when the new positions are reached. Transmission of signals. It is assumed that the AEG last " quotation is to be altered from 842.6 to 785.3. The strip, Fig. 1b, is perforated as shown and is introduced into the transmitter, Fig. 1c. The depression of Tm energizes Y and DMR moves the strip forward under the action of Ub1. Five levers HeI-HeV control respectively springs I-V Fig. 1d, springs VI being closed by each key. When the first set of perforations reach the levers, springs III and VI are closed and An operates, completing a circuit over III and l3 to energize AIII and Q, Fig. 2. AIII locks over its winding 3, 4 and Q energizes DVR to step VR on to its second contacts. ARIII is energized and completes a circuit to operate W of the group " AEG last " and CL in series, which relays prepare circuits for the drive magnets and test wipers of the selected indicator group. The second signal, a spacing signal, operate I and VI and Q energizes to step VR. The next signal, which represents the figure 7, energizes relays BIII, BIV, BV, which relays lock over their second windings and energize BRIII, BRIV, BRV respectively. The remaining signals of the train energize relays in similar relay groups, relay Q operating on each pulse to step VR. Setting of indicators. The energization of BRIII, BRIV, BRV completed a circuit for F7. It is assumed that the first indicator is displaying the digit 8 and consequently wiper In is connecting earth to lead 8. Circuits are therefore completed over f<11>8 for relays N and O as follows (1) over R8-9, R9-10 and f<1>7 to winding 1, 2 of N and O in parallel and over R7-8, R6-7, R5-6, R4-5, and f7 to windings 3, 4 of N and O in parallel. The windings of N and O are in opposition and the relays are polarized and all the resistances R are of equal value. 'Under the conditions described relay N operates completing a circuit for DN to drive the first indicator drum. The magnets DN, DO drive the drum in opposite directions. When the drum has made one step the figure 7 is displayed, wiper In earths contact 7 and P is energized over f<11>7 to break the drive circuit to the first indicator. The remaining, drums are set in a similar manner. Relay T which energizes in the drive circuit releases the selecting relays A and AR and CL falls away, but relay T maintains the group -marking relay B, BR, &c. and the markings to the relays F &c. until setting of the drums is completed. Blocking arrangements. If a second set of signals is to be transmitted before the first indicator group is completely set, relay T is,still energized and RS, Fig. 2, is up. The group selecting relays A and AR energize but as t7 is open the new relay W cannot operate. Moreover the energization of Q on the receipt of the spacing signal operates X, Fig. 2, which earths 16 and BL, Fig. 1d, pulls up. The lamp KL lights and the circuit of DMR is opened to prevent the transmission of further signals. When T releases on the completing of the first setting X falls away, BI, releases and transmission of the signals is continued. Transmission of angle of rotation of drums. If more than one indicator board is installed, the first board is provided with sender equipment indicated in Figs. 7 and 9 which transmits to the remaining boards an indication of the angle of rotation only, the further boards being provided with the indicator control equipment, shown in Fig. 10, instead of that shown in Fig. 3. The group selection at all boards is completed, as described above, over contacts 1 of WO, Fig. 9. When marking for the first numerical group is completed at the first board, the relay N or O energizes as described above but in addition one or more of the marginal relays A-E, Fig. 7, is also operated, the number operated being equal to the number of steps to be taken by the drum, e.g. if the drum is to move two steps backwards relays A and B are energized, or three steps, relays A, B and C. If the drum is to move forwards relay OR is also operated. The energization of these relays completes circuits over the lines l1-l5. In the example assumed the drum is to move from position 8 to position 7. Consequently relay N, Fig. 7, is operated and four sections of resistance RO are connected in series with relays A-E. Relay A pulls up and BII and BRII at the remote board are energized. The contacts of the marking relays of the fourth drum mechanism only are wired in their position of rest to a relay ZR, shown in Fig. 10, which energizes when CL pulls up, on the completion of group selection, and energizes PU. When the fourth relay group is energized ZR releases completing the stepping circuit to the indicator drums. Relay PH energizes as each pulse is transmitted to the drum mechanism and builds up the relay chain AZ-EZ which connects relay P to the marking relays. In the example under consideration the drum is to take one step. When PH energizes on the first pulse AZ pulls up and as only one step is to be made, P finds earth over the operated contact of BRII and pulls up, breaking the circuit to the indicator magnet. The other drums are set in a similar wav. The contacts f are of make-beforebreak type so that if no digit is to be sent both OR and NR energize and BRI pulls up. The circuit of ZR is thus opened to indicate stepping, but contact 17 is wired direct to P to prevent movement of the drum. To increase the size of the installation more than one selecting relay group may be provided.