Patent GB-875012-A (GB)
Title: Signal operated control means for keyboard and like machines
IPC: B41B27/00
Filed: 1956-08-24
Abstract: 875,012. Type-bar-making machines. DIRKS, G. Aug. 26, 1957 [Aug. 24, 1956], No. 25885/56. Class 100(3) Controlling by record-strip. Apparatus for controlling the successive sensing of code combinations recorded on a tape includes means for sensing the tape, feeding means adapted to be made operative to feed the tape past the sensing means, electrically operated start means responsive to a control signal to make operative the tape feeding means, electrically operated stop means responsive to a control signal to make the tape feeding means inoperative, an electric signal delay circuit means adapted to apply a control signal to said stop means each time a code combination representing a delay is sensed by the sensing means, and means controlled by such sensed delay combination adapted to render the delay circuit operative to apply a control signal to the said start means only after a predetermined delay. The tape 11, Fig. 1, is fed by a motor 1 through a clutch 3 and wheel 13. The clutch is controlled by a device 40, comprising discharge tubes 41, 42. A wheel 15 is also driven through the clutch, and is provided with permanent magnets 16<SP>1-n</SP> which are sensed by a head 17 to transmit pulses to a mono-stable flip-flop 19. Perforations arranged in seven channels in the tape are sensed by pins 101-7. Pulses from the flip-flop 19 are fed to a sevenstage counting chain 20 of the flip-flop type, each stage of which switches over when the previous stage switches over twice. The arrangement is that during each sensing cycle, the stage 21<SP>7</SP> switches over 64 times and the stage 211 once. The stages generate pulses at different instants of time, which pulses are fed to the pins 10 and thence through those pins which have sensed perforations to a flip-flop 26, which thus receives a number of pulses from 1-127 according to the combination sensed, which pulses are passed to a counter comprising tubes 27, 31 and a carry-over device 30. The tubes 27, 31 comprise a series of cathodes which are put into operation in succession as each pulse is received, while when ten pulses are received by the tube 27 one is passed on to the tube 31. According to the number of pulses received, therefore, one output from each tube is activated. A series of magnets 39 are arranged to control the various machine functions (e.g. elevator raising and character keys). Each magnet has one end of its windings connected to the tube 27 and one to the tube 31. For a given combination, one magnet only is energized. In the case of the tube 31, relays 34 are energized to close contacts 35 leading from battery plus to the magnet coils. In the case of signals which require a stoppage of the tape to produce a delay, the tubes 27, 31 energize relay coils, which cause contacts to close to energize the magnet coils, and further contacts to deliver current to a "stop" lead 50 to disconnect the clutch 3. In the case where the tape is to be re-started after the completion of a function such as elevator return, contacts are automatically caused on such completion to deliver current to a "start" lead 49. In cases where a fixed time delay is required, switch 48 is kept closed, and a selector switch 53 set to tappings of a resistor 54 according to the time desired. The signal then causes a switch 52 to close, whereupon. current from battery plus loads a capacitor 57. A discharge tube 55 is ignited at the desired instant, and ignites tube 41. In another form, Fig. 5, the pulses from the seven counting stages are delivered in turn, each stage operating completely before the next operates. The pulses are transmitted by signal heads 65<SP>1-7</SP> through controllable gates 96<SP>1-7</SP>, 93 and 98 to the counter tube 27 (Fig. 1). Sensing of a hole results in switching over of a corresponding contact of the series 79<SP>1-7</SP> leading to inputs 82, 83 of flip-flops 81<SP>1-7</SP>, which control the gates 96 so that where a hole is sensed the gate is rendered conductive, so that the number of pulses on the output 94 depends on the combination sensed. The gate 98 is rendered conductive at the beginning and non-conductive at the end of each cycle. On each cycle, a pulse from a flip-flop 84 is transmitted to a gas discharge tube to ignite it and deliver a pulse to the "stop" lead 50 and to the delay device 87 (similar to that in Fig. 1). The changing over of any of the flip-flops 81 causes a pulse to be transmitted on lead 89 to a gas discharge tube 90, thereby short-circuiting tube 86 and causing a pulse to be delivered to the "start" lead 49 immediately so that there is no delay. If a combination sensed is the same as the previous one, no flip-flop 81 is changed over, the tube 90 is not ignited, and the device 87 causes a delay. The pulse to "start" lead 49 also passes to the gate 93 to render it conductive. Specification 875,013 is referred to.