Abstract: An improved arrangement for testing the operability of drop wire circuitry associated with yarn handling equipment which does not require yarn movement to be interrupted during tests. A two-position switch operable between normal and test mode positions is included in the circuitry. A jack arrangement is rendered operable with the switch in the test position, thereby permitting an indicator to be selectively inserted in the drop wire circuitry path. The electrical characteristics of the indicator are such as to permit the indicator to be actuated when a drop wire falls while simultaneously disabling the normal response of the remaining drop wire circuitry. Means are provided to selectively bypass the indicator with the switch in the test position to thereby allow the drop wire circuitry to operate as if the switch were in the normal position.
Abstract: A timer device wherein a timer cam disk to be moved from a non-operating position to an operating position at a preset time point in cooperation with a timer setting drum is so formed as to be returned to the non-operating position from the operating position at a comparatively higher speed only during a predetermined time period after it is moved from the non-operating position to the operating position in order to prevent the time during which the timer cam disk is maintained in the operating position from becoming unnecessarily long.
Abstract: A LSI (large scale integrated circuit) device is disclosed which generates 12 output frequencies related to each other by a multiple of the twelfth root of two from a common time base without the use of parallel divider or shift register strings. The output frequencies comprise the top octave, or a multiple thereof, of the frequencies of an electronic musical instrument. A binary counter serves as a common time base and encodes each wave form period in a form of a binary code. A binary processing circuit associated with each output frequency stores the count position of the next desired wave form transition and updates the stored code after each transition has occurred. The binary processing circuitry comprises a latch circuit, a binary full adder or ROM (read only memory), a digital comparator or ROM, and a J-K flip-flop circuit. The outputs can be easily modified in both actual frequency and waveform symmetry.
January 12, 1977
Date of Patent:
February 6, 1979
The Wurlitzer Company
Robert W. Wheelwright, Peter E. Solender
Abstract: In a speed control system of elevator, a first speed pattern being an integration of an acceleration pattern and a second speed pattern decreasing at a constant speed for the remaining distance till the stoppage point, are set up. The car is operated in accordance with the first speed pattern. When the car reaches the decelerating point, the car is operated in accordance with the first speed pattern before the first and second speed patterns are not coincident, and then in accordance with the second speed pattern after they are coincident. A comparator is provided to detect the difference between the first and second speed patterns. When the car reaches the deceleration point, the acceleration pattern is successively reduced stepwisely in accordance with the output of the comparator. The reducing of the acceleration pattern is integrated and the result of the integration is used as the first speed pattern.
Abstract: An inexpensive single bus keyboard circuit for voltage controlled electronic musical instruments. The keyboard signal voltage is sampled and stored after each depression of a key, or release of a key when other keys are held in a depressed state, and a gate detector is provided to prevent sampling and change of stored voltage when all keys are released, to thereby insure that the last stored signal voltage is retained when all keys are released. A program counter establishes the timing relationships between the generated control signals and provides adaptive timing to prevent response to spurious key switch signals. The circuit distinguishes in a simple manner between keyboard sample voltages corresponding to the depression of one or more keys and those corresponding to the condition in which no keys are depressed.
Abstract: An envelope generator for an electronic organ, especially for developing percussion sounds, in which each of at least some of the organ cases having keyers pertaining thereto are provided with envelope control circuits interposed between the keys and the respective keyers. Each envelope control circuit includes voltage supply means connected to the keyer and a control circuit therefor which is actuated by depression of the key. The control circuit provides for continuous actuation of the keyer by voltage from the voltage supply means while the key is depressed or for a momentary supply of keyer actuating voltage from the voltage supply means to the keyer followed immediately by a decay of the keyer actuating voltage at a predetermined rate and which rate can be selectively varied.
Abstract: An automatic rhythm generator of an electrical musical instrument including a rhythm pattern generator for rhythmically selecting for actuation different ones of a plurality of instrumentation circuits to be sounded and a strobe pulse generating circuit for establishing the appropriate pulse width of a drive pulse needed by each instrumentation circuit for proper actuation thereof. The rhythm pattern generator circuit selectively enables a plurality of drive gates respectively associated with the plurality of instrumentation circuits during selected ones of a succession of periodic rhythm cycles in accordance with a predetermined rhythm pattern. The strobe circuit is synchronized with the rhythm pattern generator and generates during each rhythm cycle a plurality of strobe pulses on a corresponding plurality of outputs respectively associated with the plurality of instrumentation circuits. Each of the strobe pulses has a width preselected for the instrumentation circuit with which it is associated.
Abstract: In an electronic musical instrument wherein waveshape F(x, y) is computed and the resultant waveshape is converted to a musical tone, computation of said waveshape F(x, y) is carried out in accordance with either one of the following equations: ##EQU1## WHEREIN: F(X), F(Y) REPRESENT MATHEMATICAL FUNCTIONS OF TIME, RESPECTIVELY; AND N REPRESENTS AN ARBITRARY INTEGER.
Abstract: An attachment for an electronic watch worn on a wrist has a plate linked to an electric switch and moving about a support secured at such a location on the watch system that the wrist can be brought about to press said plate against a firm surface for a duration and a number of times to select and cause the displaying of a set of watch data. This firm surface can be anything around the watch wearer's body or parts thereof, but not absolutely a finger on the side of the wrist not wearing the watch.
Abstract: A solar chronometer in which a style is aligned with the celestial pole and an equatorial member, preferably in the shape of a ring, is aligned with the equator. The style and equatorial member cast shadows upon a chart and the point where the shadows intersect indicates the hour and the date.
Abstract: A power converter control apparatus comprising continuously controlled converter units and on-off controlled converter units for effecting powering control and regenerative braking control of a DC motor, which is arranged to include a unit change circuit for generating unit changing operation signals in response to a command for instructing the number of the converter units to be rendered operative from a master controllerand conduction phase signals from a phase shifter. In accordance with the unit changing operation signals, the conduction phase signals from the phase shifter are applied as a gate signal to the continuously controlled converter units in response to a powering control or a regenerative braking command, while a minimum conduction phase signal is applied as a gate signal to the on-off controlled converter units in response to a powering control command signal and a maximum conduction phase signal including a commutation marginal angle in response to a regenerative braking command signal.
Abstract: A bridge for an electric string bass or other stringed musical instrument includes a base adapted for attachment to the body of the instrument and a number of saddles for individually supporting the strings, the saddles being adjustably movable to different positions relative to the base, in the direction along the length of the strings, to adjust the string intonation. The saddles may include piezoelectric elements for providing electrical signals and, in this case, the base may further include a covered recess for housing a plurality of volume controls each associated with a respective one of the strings. The saddles are designed and arranged on the base to support the strings with a given curvature matching that of the fret board and an adjustment means is provided for raising, lowering and/or tilting the base relative to the body to bring the strings into proper height adjustment relative to the frets.
Abstract: A fully digitalized function-of-time generator suitable for use as a tone envelope generator in a digital electronic musical instrument, comprising: a clock pulse generator for generating a clock pulse at a selectable rate; a gate enabled at each arrival of the clock pulse; a single-stage binary shift register for successively shifting out its contents as a digital word representing the instantaneous values of a desired function of time synchronously with the clock pulse; a digital subtractor; a digital multiplier; and a digital adder, all of these members being interconnected to each other to be operative so that the output of the register is subtracted from a first set value representing a digital word, the resulting difference being multiplied by a second set value representing a digital word, the resulting product being added to the output of the register via the gate, so that the resulting sum is loaded into the register.
Abstract: A motor heat control circuit is provided for heating an electrical motor during the time of motor shutdown, with the circuit functioning to interconnect a winding of the motor with a source of alternating current voltage for substantially an entire half-cycle of the alternating current voltage but only at intervals comprising a selected plurality of cycles of the alternating current voltage. In its preferred form, the motor heat control circuit is adapted to be connected in shunt circuit with a main motor contactor normally interconnecting the motor winding with the source of alternating current voltage, and includes a controllable semi-conductor switch controlled by digital counting logic which is responsive to clock pulses developed from the alternating current voltage.
Abstract: This vacuum-type circuit interrupter is a high current interrupter rated for interrupting currents of 35,000 amperes r.m.s. or higher. Despite this high current interrupting requirement, each of its disc-shaped contacts can be made from an exceptionally small and thin blank because these contacts are of beryllium and each has a flat surface, without the usual central recess, extending from its center to a perimeter located radially between the outer periphery of the contact and the outer periphery of the inner end of the associated contact rod. On this flat surface of beryllium, contact-engagement occurs and arcs are initiated during interruption. Each contact rod is joined to its associated beryllium contact by means of brazed joint, a portion of which is accommodated in a very shallow recess on the back surface of the contact.
Abstract: This invention discloses a load management system for reducing the peak load in an electrical power distribution network. This invention monitors, records and reduces the peak load present in an electrical distribution network by deferring power service from and cycling power service to preselected transformer loads during periods of peak power demand. The peak load control function of the present invention is controlled by a power monitor which is located at the distribution transformer. The power monitor measures the ambient temperature and the power load on an associated distribution transformer and initiates the peak load control function whenever the product of the temperature factor and the measured load rises above a preset control point. Initiation of the peak load control function completely defers power service from a first group of low priority loads and activates a timing and switching mechanism which cycles power service among selected groups of controlled loads in a preselected order.
Abstract: A drive system for a utility vehicle, such as a fork-lift truck, comprises a hydrostatic transmission whose pump is driven by an electric shunt-wound motor having a field winding so energized, under the control of a potentiometer responsive to the fluid pressure in the transmission, that the field current varies inversely with transmitted torque over at least a portion of the speed range of the vehicle. The automatic potentiometer control exerted by the fluid pressure may be overridden by a manually operable lever. The same potentiometer can be used to vary the motor speed in response to the output pressure of another pump which is driven by the electric motor and coupled with the fork-lifting mechanism of the vehicle.
Abstract: Spatially separated high frequency tonal effects from an electronic musical instrument having less tone generators than keys selectable. A high frequency speaker system is provided in addition to the normal audio system. The audio signals produced by the tone generator are applied to a high pass filter-amplifier circuit before application to a tweeter switch. Digital logic is provided to demultiplex the note generator capture signal for note generator assignment information. The demultiplexer information is applied to the tweeter switches to effect the activation of a tweeter switch and permit the sounding of the tweeter speaker. Thus it may be seen that the present invention permits the separate soundings of the high frequency range in a directional fashion, creating the movement of sound sources and changing spatial relationships in response to key activity.
Abstract: An elevator system including an elevator car mounted in the hoistway of a building having a plurality of floors, hoistway doors at the floors, and a floor selector for controlling the movement of the elevator car. Each hoistway door includes address indicia related to the address of its associated floor in the building. A detector on the elevator car reads the indicia during movement of the hoistway door. The address read from the hoistway door is loaded into a car position memory associated with the floor selector.
October 26, 1977
Date of Patent:
January 16, 1979
Westinghouse Electric Corp.
Walter Zolnerovich, Jr., William N. C. Leang
Abstract: An electric switch arrangement for use as a current supply switching means for a bipolar electric load is disclosed, comprising two switches connected in series with each other and with the load and located on opposite sides of the load. A monitoring equipment is provided for supervising the operation and function of said switches. Said monitoring equipment comprises potential generating means which are arranged, when both said switches are open, to generate at each pole of the load a potential deviating from the potential existing at said pole when anyone of said switches is closed or both said switches are closed, and sensing means which are arranged to sense the potential of at least one of the poles of the load.