Patent GB-378251-A (GB)
Title: Apparatus for automatic production and transmission of telegraphic or radiotelegraphic signals
IPC: H04L15/22
Filed: 1931-10-07
Abstract: 378,251. Electric signalling systems. DETRUISEUX, J. E. M., 2, Avenue Rapp, Paris. Oct. 7, 1931, No. 27871. Convention date, Oct. 8, 1930. [Class 40 (i).] Apparatus for the automatic production and transmission of telegraphic or radio-telegraphic signals comprises a number of independently adjustable signalling members which co-operate with a source of current to produce a sequence of signal impulses, and then to close an operating circuit for a subsequent signalling member to set this member into signalling operation so that the transmission of an adjusted combination of signals is effected or a signal is repeated a predetermined number of times. Each signalling member is formed as a spool-shaped insulating drum 5 rotatable on a shaft 6 and carrying a dial (not shown) which indicates when the drum is set so that conducting segments 12 arranged on the curved surface in accord with the desired signal are positioned in the path of a brush 18. The segments 12 are connected to a ring 14 engaged by a brush 19 completing a circuit to line, whilst an additional segment 13 is connected to a ring 15 and brush 20 arranged to complete the circuit of an operating magnet 34 of a subsequent signalling member. The magnet 34 withdraws a bolt 32 against a spring 33 so that a pawl 29 mounted on a roller 10 carrying the brush 18 is forced into engagement by a spring 30 with the teeth of a member 27 keyed to a continuously rotating shaft 25. After a single revolution of the roller, the pawl 29 is tripped by the spring-returned bolt 32. In the arrangement shown in Fig. 8, the drums 51 .. 5<6> are set according to desired signals, and on the closure of a switch 41, a motor 3 is set into operation. Over the switch 55, the magnet 34<1> of the roller 101 co-operating with the first drum 51 is energized and the brush 18<1> after passing over the signal contacts reaches the sector 13<1>, completing the circuit of the magnet 34<2> which in a similar manner initiates the rotation of the brush and roller 102 over the contacts set up on the drum 52 in its predetermined position. When the brush 18<6> of the final drum 5<6> reaches the segment 13<6> an electromagnet 34 of a time switch 55 is energized. This switch delays the action of the magnet 34<1> for an interval during which the drums are adjusted for a new set of signals. The operation of the magnet 34 releases a pawl 29 which clutches a roller 56 to a shaft 58 rotated slowly from the shaft 25 by gearing 59<1>, 59<2>. The roller 56 carries a brush 57 which is arranged to contact after a time interval with a segment 63 connected to a ring 64 on a stationary drum 62 and to complete through brush 65 the circuit of the electromagnet 34<1> of the first signalling member. The time switch 55 may be omitted, the motor being stopped between successive groups of signals by the operation of the switch 41 when the final signal has been transmitted and the brush 18<6> has reached the segment 13<6> of the member 5<6>. After a fresh combination of signals has been set up, the closure of the switch 41 energizes the operating magnet 341 to initiate the rotation of the brush roller associated with the first drum. A modified form of signalling member, Fig. 12, is provided with contacts representing a large number of signals, e.g. the alphabet and numerals. A drum 5 mounted on a shaft 6 is rotated by a knob 7 and carries a dial 8 by which the adjustment of the drum for a desired character can be observed. The drum has conducting studs 12 of lengths corresponding to the code impulses and connected to a ring 14 and brush 19. The studs 12 have projections 67 arranged to co-operate with projections 70 on a fixed insulating member 69, and connected by conductors 72 to a number of separate insulated conducting segments 73, successively engaged during the rotation of the brush 18 The projections 67 are arranged so that between successive impulses is provided a space on the drum with a member 70 which is not engaged by the drum projections. Each set of studs 12 is followed by a stud 13 co-operating with a brush 20 to energize an electro-magnet 3 associated with the brush-roller 10 of a subsequent signalling member. Any of the signalling members may be shunted by an associated twoposition switch 38 through which the operating circuit of the corresponding electromagnet prepared by a preceding signalling member is extended to a subsequent electromagnet.