Patent GB-672772-A (GB)
Title: Improvements in and relating to electrical systems for automatically registering time and date
IPC: H04M15/00
Filed: 1948-01-20
Abstract: 672,772. Date-indicators. TELEFON FABRIK AUTOMATIC AKTIESELSKABET, and UNGAR, E. Jan. 20, 1948 [Jan. 23, 1947], No. 1750/48. Class 106 (iv). [Also in Group XVIII] An electrical system for automatically registering time and date comprises a number of groups of registering members, which groups are arranged each to register one digit of the numbers indicating time and date and to be operated by clock-controlled electrical pulses applied to the group adapted to register the unit digit of the minute number, from which group pulses for successively operating the registering members of the remaining groups are periodically transmitted. Each of the groups of registering members consists of selector switches and/or relay chains. A relay A, Fig. 1, receives an impulse every minute, from a master clock, and closes a circuit to a group of serially connected relays M1-M10 of a relay chain M. The relays are thus energized sequentially and serve to register the units of minutes. Upon reception of the tenth impulse a circuit is closed to a coupling magnet MVK which is energized and " stepson" an associated selector switch MV comprising rotary switch banks MV-a, MV-b, MV-c, MV-d and MV-e which switch therefore serves to register the tens of minutes. In the same way the units and tens of hours are registered upon a selector switch TV and a relay chain T respectively, Fig. 2, the units and tens of days are registered upon a selector switch DV and a relay chain D respectively, Fig. 3, and the months are registered upon a selector switch MOV. The connections of the fourth contact bank in each selector switch MV, TV and DV are so arranged as to ensure proper setting of the switch at the beginning of each period to which it relates. The contacts of the bank DV-d of the switch DV which represent the digits 0, 1, 8 and 9 are connected via conductors 500, 501 and 502 through contacts controlled by the relay chain D to the bank MOV-e to allow for 30, 31 and 28 day months and a group of relays F, G and U operate associated contacts to switch the conductor 502 over to the " 9 " contact of the bank DV-d during leap years. At the end of each month a circuit is established to a relay X, Fig. 4, a coupling magnet MOVK and the switch MOV is stepped-on. Recording of the time and date is effected by an apparatus (printing or perforating) connected to four conductors I, II, III, IV, Fig. 5, when a relay S is energized by operation of a key. A relay J is arranged to transmit a series of impulses to a relay chain K, Fig. 4, which controls the contacts of a contact group Kk, Fig. 2, connected by conductors 101-112 to the contact banks MV-d (tens of minutes), TV-d (units of hours), DV-b (units of dates), MOV-b (months) and to a contact group DT, Fig. 4, the contacts of which are controlled respectively by relay chains D (tens of dates) and T (tens of hours) and to a contact group Mn, Fig. 2, controlled by the relay chain M (units of minutes). The arrangement is such that the relay J transmits eleven series of impulses to represent a time and date. The first series represents the tens digit of the date. When the number of impulses transmitted to the relay chain K, Fig. 4, is equal to the tens digit of the date and the appropriate relay K is energized a circuit is closed via the contact bank KV-d and contacts of the group Kk and contacts of the groups DT, Fig. 4, to a relay H, Fig. 5, which is energized and breaks the circuit to a relay V which is sending the impulses to the recording apparatus. Thus the " tens " digit at the instant of operation of the relay S is determined. The other digits in the time and date are picked up from their registering selector switch or relay chain in the same way. Two groups of lamps LP and Q, Fig. 1, are provided whereby an indication of the registration of a particular stage (viz. selector switch and relay chain) may be obtained. The lamps of group L.P. are connected to corresponding contacts of bank MV-c (tens of minutes), a contact group TRK (tens of hours) and a contact group DRK (tens of dates). The lamps of group Q are connected to corresponding contacts of bank TV-c (units of hours), bank DV-a (units of dates), bank MOV-a (months) and a group of contacts ML controlled by the relay chain M (units of minutes). By operation of a key any of the above related pair of connections (e.g. tens and units of minutes) to the lamp groups LP and Q may be completed and the lamps of the groups which light give an indication of the registration in that stage to which the key relates. If the indication thus obtained shows that the stage registration is incorrect correction may be effected by operation of a wheel NU, Fig. 1, which serves to transmit impulses to the relay A.