Patent GB-190712585-A (GB)
Title: Improved Apparatus for Telegraphing Type Printed Messages.
Inventor: HAAR JOSEF
Filed: 1907-05-30
Granted: 1908-04-23
Abstract: 12,585. Haar, J. May 30. Telegraphs.-A receiving-instrument for actuating an electro-magnetic typewriter is shown in section in Fig. 4, and is actuated by a transmitter shown in Fig. 2, both instruments being of dial form with characters marked round the edge. The motion of an arm 15 of the transmitter is copied synchronously by an arm 27 of the receiver, these arms being carried on the axes of motors 13, 24, which are in series in the line 43 and are energized by a battery. The receiver has a pair of pins 33 opposite each character, forming terminals of a circuit for energizing a magnet 35, which operates the same character in a typewriter. The arm 27 carries an electro-magnet 28 having an armature 31 supported by a spring on a parallel arm 29. When the magnet 28 is deenergized, its armature springs back and closes the the printing-circuit of the character to which it is opposite, the pins 33 engaging in a cavity in the armature 31 so to prevent subsequent rotation. The arm 15 of the transmitter carries a key 16, by depressing which the circuit through the motors and magnet 28 is broken, so that when the arm 15 is stopped opposite a given character by depressing the key 16, the magnet 28 in the receiver releases its armature, which stops the arm 27 opposite the same character and operates the typewriter. The construction of the transmitter is as follows. Two concentric insulated rings 2, 3, Fig. 2, connected to opposite poles of the line battery, have dovetailed grooves 5, 6 cut in their under surfaces, and in each groove is fitted a slider having one conductive and one non-conductive pin. In Fig. 2 one pin of each slider is seen, the pin 9 of the one slider being conductive and the pin 11 of the other slider being non conductive. The key-arm 15 lies between the two pins of each slider and also between two pins 18, 19 carried by an insulating arm 17 loosely mounted on the axle of the motor 13. The pins 18, 19 make contact with rings in the base of the instrument, whereby they are connected to one terminal of the motor 13. The key arm 15 lies normally between the three pairs of pins and the circuit is open. To produce a counterclockwise rotation, the key arm 15 is moved slightly to the left by hand till it touches the pins 9, 18, whereby a circuit is closed from earth through the motor 13, pin 18, key-arm 15, pin 9, ring 2, line 38, battery, and receiver, and back to earth ; the motors 13, 24 then turn synchronously. For clockwise rotation, the direction of the line current is reversed by a switch, and the arm 15 is turned slightly to the right to complete a circuit through the ring 3 and its slider and the pin 19. When the key arm 15 comes opposite the character which is to be transmitted, it is depressed, being made flexible for this purpose, and breaks the circuit by coming on to an insulated portion of the pin 18 ; the breaking of the circuit actuates the receiver as described above: The free play of the pins 33 in the cavity of the detent-armature 31 serves to adjust the synchronism of the motors 13, 24 at each transmission of a character.