Patent GB-736080-A (GB)
Title: Facsimile recording apparatus
IPC: H04N1/00
Filed: 1952-05-30
Abstract: 736,080. Copying-telegraph receivers. CREED & CO., Ltd. May 30, 1952 [June 6, 1951], No. 13814/52. Class 40 (3). Facsimile recording equipment mounted on a car or other vehicle and arranged to be energized by a storage battery comprises a normally disconnected, movable segment carriage which is connected to a power motor by the energization of a magnet which closes a normally open switch to operate at full speed a dynamotor arranged to run at a low speed when it is first energized by the battery. The manual operation of a switch 43<SP>1</SP> places the equipment in the stand-by condition and lights the filaments of a double-triode valve T in a selector unit SM and also lights the filaments of tubes of a frequency standard member 65. The closure of the switch 431 also causes a dynamotor 45 to operate at half speed. The equipment of a car is selected for operation by the transmission of a particular frequency for about 2 seconds. With the switch 84 set at the contact to connect the appropriate capacitor 86 of an input tuning circuit, the reception of the calling frequency overcomes the normal negative bias of the valve T which conducts and energizes a line relay 107. The operated condition of relay 107 connects a charging circuit for a capacitor 110 over a high resistance 115, and if the relay 107 remains energized for a considerable time the capacitor is charged to a value such that on the release of the relay 107, a power relay 116 is operated, thereby lighting the filaments of the valves in a recording amplifier RM and energizing a dynamotor 44 which provides anode voltage for the valves of the amplifier. Contact 122 of relay 116 connects battery to the vibrator power pack unit 66 by which a relay 120 is energized and the power motor 14 set into operation. Magnets 28, 35 are energized, and also magnet 22 which connects the carriage to the power shaft 21 and opens contact 24 so that the dynamotor 45 runs at full speed due to the short-circuiting of the resistor 61. The magnet 28 removes a latch 27 from a tooth 26a on a cam disc 26 so that a wrapper is folded into the recording position, and the armature 36 of the magnet 35 engages the disc 37 to prevent the stylus 13 from being rotated by motor 15 driven from the frequency-standard equipment 65. Contact 134 of relay 120 energizes the frequency standard 65 by connecting its input terminal 71 to the positive output terminal 58 of the dynamotor 45 now running at full speed. When the carriage 16 starts to move, switch 17 is opened and removes a ground circuit from phasing relay 132 which can be operated by short phasing pulses received by the line relay 107 since the high resistance 115, previously present in the charging circuit of capacitor 110, has been removed by the operation of relay 120. The operation of the relay 132 opens the circuit of magnets 28, 35 and the armature 36 releases the cam disc 37 so that the stylus 13 is free to rotate within the cylinder 12 to record the received signals. At the end of the message contact 19, opened by the carriage 16, releases relay 116 which de-energizes dynamotor 44 and at contact 123 breaks the circuit of the magnet 22. The carriage in returning to its normal position trips the latch 27 so that the cam 26 in rotating to its original position, opens the wrapper, feeds out the recorded sheet and introduces a new sheet. The closure of contact 24 applies ground to the stylus 13 and the opening of contact 25 switches in the resistor 61 which causes the dynamotor 45 to run at half speed. The reclosing of contact 18 cuts out resistor 76 so that motor 14 runs at full speed and a notch in a cam 32 driven by this motor allows an arm 31 to drop, thereby closing contact 30 at which a magnet 29 is energized to operate a knife to cut the message sheet, and relay 145 is operated to open the circuit of the phasing relay 132. At contact 150, relay 145 maintains the energization of the power pack 66 enabling the motor 14 to run until the cam 32 lifts the arm 31 to open contact 30 so that the magnet 29 is de-energized and the circuit of relay 145 is broken before contact 33 is again closed. At released contact 150 the power unit 66 is deenergized and relay 120 releases. In a transmitting arrangement, Fig. 3 (not shown), the phasing pulses are sent as short bursts of the frequency employed to select a particular car.