Showing papers on "Rotational speed published in 1969"

Installation for preventing spinning of the driven wheels of a motor vehicle

Abstract: An installation for preventing the spinning of the driven wheels of a motor vehicle in which the rotational slippage between the driven and non-driven wheels is determined, and in which the rotational speed of the driven wheels is controlled in dependence on the magnitude of such slippage.

Rotational speed sensor

Abstract: A rotational speed sensor for a skid control system for sensing the rotational speed of a prop shaft of a wheeled vehicle having a rotor mounted for rotation with a prop shaft and a stator mounted on the differential housing of the vehicle The stator and rotor are provided with confronting circumferentially disposed teeth with the stator further including a coil for providing an output signal to the skid control system and the rotor further including a magnet for establishing a flux through the coil

The operation of a rotating, wickless heat pipe

Abstract: : A Nusselt type analysis was performed during laminar film condensation on the inside of a rotating truncated cone. This analysis was employed to determine the condensing limit of a wickless heat pipe, rotating about its longitudinal axis. Performance characteristics including the effects of geometry, rotational speed, and the characteristics of fluid are given. A comparison is made between the condensing, boiling, sonic, and entrainment limits for a given heat pipe geometry.

Control system for fluid motor

Abstract: A speed control unit for controlling the speed of a device driven by a hydraulic motor and in which the speed of the device is controlled by the flow of pressured fluid to the fluid motor. The speed control unit includes a first element which is rotated as a function of the speed of the harvesting machine and a second element which is rotated as a function of the speed of the device with means for automatically varying the flow of fluid whenever either of the element''s rotational speed is varied.

Overspeed control for centrifuge

Abstract: The centrifuge overspeed control disclosed herein facilitates the use of different rotors having different maximum speeds and automatically limits the rotational speed of the centrifuge to an appropriate level. As the rotor rotates, an optical pickup derives timing signals from first and second indicia carried by the rotor and deenergizes the centrifuge if the interval between successive timing signals drops below a predetermined value.

Motor speed control circuit

Abstract: An improved circuit for precisely controlling the speed at which a motor rotates and for protecting the motor against excessive current drain. Pulses generated synchronously with rotation of the motor trigger a one-shot. The one-shot generates a nonsymmetrical square wave whose symmetry varies with the rotational speed of the motor. In one embodiment, an integrating circuit then converts this nonsymmetrical square wave into a sawtooth or triangular waveform that includes a DC component proportional in magnitude to the motor rotation speed. This waveform is fed into one input of a differential amplifier. The amplifier generates a continuous output, a pulse width modulated rectangular wave output, or no output, depending upon whether the motor is running below the proper speed, approximately the proper speed, or overspeed. This output is fed to a switching-type current regulator connected in series with the motor.

Improvements in Winding Apparatus

Abstract: 1,168,893. Winding yarns. J. SCHARER. 16 Aug., 1967 [19 Aug., 1966], No. 37656/67. Headings DID and D1J. A winding machine for winding threads, yarns or tows into crosswound packages has its traverse formed by two yarn guide arms 34, 41 which rotate in opposite directions about two parallel axes over a yarn guide 52. The arms 34 and 41, during rotation, alternately project beyond the contour of and retract behind the yarn guide 52, see also Fig. 3 not shown. The arms 34 and 41 and bobbin shaft 6 are driven at a predetermined relative speed by a progressively variable gear 91, 93 the gear ratio increasing in response to the increasing radius of the package by means of a feeler member (e.g. bobbin support 70) coacting with the growing package. The winding speed can thus be kept constant or progressively increased. As shown in Figs. 6 and 7, yarn 62 is passed through tension device 63, past stop motion 64 over the thread support 65, then engaged by the oppositely rotating thread guide arms 66, over supporting shaft 99 and wound onto the package 67. Traverse mechanism: The oppositely rotating arms (labelled 34, 41 in Fig. 1 and 66 in Figs. 6 and 7) are rotated on offset axes by a shaft (32) and eccentric sleeve (38), see also Figs. 2 to 5 not shown. Thereby, as the thread approaches the end of one traverse, the rotating arms are radially displaced slightly and the thread slips easily from one arm to the other which moves it in the opposite direction. The drive to the rotating arms is taken from a common shaft 21 which, in Fig. 1, also drives the bobbin spindle. In Fig. 6 the spindle and common shaft are both driven by a single toothed belt. The arms and the rotational speed of the bobbin can be reduced as the package grows, (see below). Preferably projections of contours swept by the rotating arms onto a generatrix of the package are of identical length. The thread support (labelled 52 or 65 in Fig. 1 and 6 respectively) can have a straight or curved edge so as to produce differently shaped packages. Spindle and rotating arms drive is taken from motor 71 via belt 72, drum 80, shaft 79, drum 81, through belt 93 to friction disc 91 thence to the common spindle and rotating arms drive (see above) via gear 92, belt 74 and pulleys 75 and 76. As the package grows the rockable arm 70 moves clockwise and this motion operates via linkages 98 to move a toothed sector 97, and thus pulley 95 and belt 93, to the right. The rightward movement of belt 93 lowers the gear ratio between drum 81 and friction disc 91 and thereby reduces the speed of the bobbin and rotating arms. Stop motion: When device 64 detects a break in the yarn a pin 89 (Fig. 7) causes segment 87 to be coupled with rotating shaft 79 and control shaft 86 thereby pivoting the friction disc 91 away from belt 93 into a neutral position thus interrupting the spindle drive. End finding: Simultaneously with the interruption of the spindle drive on rotation of control shaft 86, an upper cam 107 connected to control shaft 86 also rotates thereby causing its cam follower to (a) swing suction nozzle 110 upwardly to the package and (b) rotate rocking arm 70 so as to lift the package off supporting shaft 99, Fig. 6. Meanwhile the continued rotation of the lower cam 100 depresses its cam follower still further and thus engages the friction disc 91 with rotating cone 90. This cone drives the friction disc 91 and the package in reverse to unwind the thread which then is sucked into nozzle 110. On further rotation of control shaft 86 and its cam 100 (a) a pawl (123) (Figs. 9 and 10 not shown) acts on notched segment 87 so as to disengage rotating coupling 85 from shaft control 86, and (b) cam 100 pivots the friction disc 91 away from rotating cone 90 and cam 107 returns the nozzle downwardly. Recommencing winding: The thread held in suction tube 110 is knotted and the attendant depresses foot pedal 124 (Fig. 6). This releases the pawl (123) and recouples control shaft 86 with rotating coupling 85. Cams 100 and 107 are thereby rotated to their operating positions in which friction disc 91 is returned to press against revolving belt 93 and package 67 is lowered onto shaft 99. Cams 100 and 107 are stopped in the operating position by the decoupling of shaft 86 from rotating coupling 85 by the engagement of notched segment 87 with pin 89.

Fuel injection device

Abstract: A fuel injection installation, especially for multicylinder internal combustion engines with at least one electromagnetically actuated injection valve and an energy storage device in the load circuit which is triggered in dependence on the rotational speed and in which the discharge of the energy storage device acting on the electromagnet of the injection valve is limited by a control device to a value above the holding current of the injection valve.

Electronic control of vehicle brake system

Abstract: A plurality of filters are fed by a voltage which is proportional to the rotational speed of a wheel being braked. At least one filter produces an output which follows this voltage substantially without phase displacement whereas at least one other filter substantially differentiates this voltage and produces an output which is shifted 90* in phase and is proportional to rotational deceleration and acceleration of the wheel. Threshold circuits are fed by the filter outputs and control a normally open brake fluid inlet valve and a normally closed outlet valve.

Speed control means

Abstract: IN A ROTATIONAL SPEED CONTROL MEANS FOR HAND SUSTAINED PRESSURE FLUID DRIVEN GRINDING, DRILLING AND LIKE MACHINES, PREFERABLY FOR DENTAL WORK, AN UPPER LIMIT IS PUT ON THE NUMBER OF REVOLUTIONS PER MINUTE OF THE MACHINE FROM IDLING AND UP TO FULL WORKING LOAD BY A CONTROL VALVE AND A CONTROL CIRCUIT COOPERATING TO DIVERT OR TO THROTTLE PRESSURE FLUID IN THE CONTROL VALVE IN ADVANCE OF THE MACHINE SUCH AS TO MAINTAIN AUTOMATICALLY UNDER ANY PARTIAL LOAD A PREDETERMINED SELECTIVE UPPER ROTATIONAL SPEED LIMIT FOR THE MACHINE.

Sensing rotational speed by amplitude modulating a continuous microwave signal

Abstract: A rotating member speed sensor in which microwaves are beamed toward the rotating member so as to be reflected from a surface of the rotating member to a detector. The surface of the rotating member has grooves therein so as to amplitude modulate the beamed microwaves such that the reflected microwaves as sensed by the detector have a frequency of modulation corresponding to the speed of rotation of the rotating member.

Rotary machine and method for drying clothes and the like

Abstract: AN IMPROVED MACHINE AND METHOD FOR DRYING CLOTHES AND THE LIKE, WHEREIN THE CLOTHES TO BE DRIED ARE ROTATED AT A RELATIVELY HIGH SPEED IN A ROTATING CHAMBER SO THAT THE CLOTHES FORM AND MAINTAIN AN ANNULAR LAYER ABOUT THE AXIS OF ROTATION OF THE CHAMBER. NOVEL FAN BLADE AND PLENUM CHAMBER ASSEMBLIES ARE MOUNTED ON THE ROTATING CHAMBER AND ARE UTILIZED TO CONTINUOUSLY FORCE AIR, UNDER PRESSURE, INTO THE ROATING CHAMBER AND THUS INTO THE ANNULAR LAYER OF CLOTHES SO AS TO "FLUIDIZE" OR "FLUFF" THE CLOTHES IN THE ANNULAR LAYER. AT LEAST A PORTION OF THE AIR EXHAUSTED FROM THE CHAMBER IS REINTRODUCED OF RECIRCULATED BACK INTO THE CHAMBER. PERIODICALLY, THE ROTATIONAL SPEED OF THE CHAMBER IS ABRUPTLY REDUCED FROM THE HIGH SPEED TO AN INTERMEDIATE SPEED BELOW THAT NECESSARY TO MAINTAIN THE ANNULAR LAYER OF CLOTHES WHEREBY THE CLOTHES IN THE CHAMBER ARE TUMBLED, FLUFFED AND REARRANGED IN THE CHAMBER. ALMOST IMMEDIATELY AFTER A SPEED REDUCTION, THE SPEED OF THE CHAMBER IS AGAIN INCREASED TO THE HIGH SPEED SO THAT THE ANNULAR LAYER OF CLOTHES IS REFORMED.

Free Molecule Flow Through a Long Rotating Tube

Abstract: The free molecule flow through a long tube rotating about its axis is investigated. For a given density difference across the tube ends the mass flow through the rotating tube is less than that through a stationary tube. For low rotation speed the decrease in mass flow is proportional to the square of the angular velocity while for high speed the mass flow is proportional to the reciprocal of the square of the angular velocity. Radial molecular density and molecular flux distributions are also obtained.

Optical measurements of mass density in a high- speed, confined, gaseous vortex

Abstract: An optical method based on light-deflection mapping has been developed and used to determine the radial variation of fluid density in a high-pressure ratio, high-speed, air vortex that was generated in a 3-in.-diam, 18-in.-long swirl chamber consisting of two symmetric halves. An intense, parallel, thin light beam was transmitted laterally through the vortex at various off-axis positions, and the small light deflections caused by the density field of the vortex were measured. From the variation of the deflection angle over the radius, the radial density profile was numerically calculated by assuming rotational symmetry and solving the resulting integral equation. The density profile of the vortex was determined in two cross sections, at various operating conditions of the chamber. The results show that the core region in which the fluid rotates like a solid body has a very uniform diameter corresponding to about half of the exhaust port diameter. The presence of slight axial density differences, which are related to the meridional flow movements, is clearly shown. The lowest density is found to occur at the vortex axis in the central portion of the chamber. From the density profiles and suitably corrected pressure profiles measured with probes, static temperature profiles were calculated; the temperature exhibits a very low minimum near the outer limit of the solid-body-type core. The fluctuations of the light-beam deflection angle shed some light on the nature of transient phenomena occurring in the vortex. In addition to acoustic resonance, considerable irregular density fluctuations were observed, especially at radii smaller than that of the exhaust opening. This is believed to be because of the existence of periodic fluctuations in the rotational speed of the vortex.

Constant speed drive

Abstract: A constant speed drive mechanism wherein a drive member contacts a driven member through frictional surfaces and the frictional force engaging these two surfaces is varied relative to the speed of rotation of the driven member. At low speed, the frictional surfaces are urged into engagement by biasing means acting on a plurality of flyweights and, as the rotational speed of the driven member increases, the flyweights react from centrifugal force to overcome the biasing means, thereby reducing the frictional force on the surfaces.

Numerical control system for providing a constant rate of metal removal

Abstract: A numerical control system for providing a constant rate of metal removal in terms of surface feet per unit time. The operative relationship between the rotational speed of a rotating workpiece (RPM), the effective radius in inches of the rotating workpiece (R) and the desired rate of metal removal in surface feet per minute (SFM) is defined as: The relationship is mechanized by a plurality of digital integrators which generate pulse frequency signals proportional to each side of this relationship. These pulse frequencies are then compared with the result of this comparison affecting the speed of the rotating workpiece so as to close the control loop and fully mechanize this relationship. In one embodiment, the pulse frequencies are compared by generating phase varying signals which are then phase compared. In another, a single phase varying signal is generated and phase compared with a constant phase signal. A number of alternative embodiments are disclosed for indicating the speed of the rotating workpiece including a novel digitizer which also provides a steady state signal indicative of workpiece rotational speed.

Temperature control by mass flow control of gases in a gas turbine engine

Abstract: A GAS TURBINE ENGINE COMPRISING SENSOR MEANS RESPONSIVE TO A FUNCTION OF ENGINE ROTATIONAL SPEED, AND CONTROL MEANS, WHICH ARE BROUGHT INTO OPERATION BY THE SENSOR MEANS ONLY WHEN THE SAID SPEED DOES NOT EXCEED IDLING SPEED, THE CONTROL MEANS, WHEN OPERATED, INCREASING THE GAS TEMPERATURE IN A REGION DWONSTREAM OF THE UPSTREAM END OF THE COMBUSTION EQUIPMENT OF THE ENGINE TO SUBSTANTIALLY ELIMINATE THE PRESENCE OF UNBURNT FUEL IN THE EXHAUST GASES LEAVING THE ENGINE.

Constant speed drive

Abstract: A MECHANISM FOR DRIVING A LOAD AT CONSTANT SPEED FROM A VARIABLE SPEED INPUT SHAFT, WHICH COMPRISES EPICYCLIC GEARING INCLUDING A MEMBER DRIVEN BY THE INPUT SHAFT, A MEMBER DRIVING AN OUTPUT SHAFT CONNECTED TO THE LOAD AND A REACTION MEMBER, A VARIABLE DELIVERY HYDRAULIC PUMP CONNECTED TO BE DRIVEN BY THE REACTION MEMBER AND HAVING A PINTLE NOZZLE WHICH ADJUSTS ITS AREA AUTOMATICALLY IN THE SENSE TO MAINTAIN THE DELIVERY PRESSURE OF THE PUMP SUBSTANTIALLY CONSTANT, A PELTON WHEEL ON THE OUTPUT SHAFT DRIVEN BY LIQUID DISCHARGED BY THE NOZZLE, MECHANISM FOR SENSING THE ROTATIONAL SPEED OF THE OUTPUT SHAFT AND MEANS CONTROLLED BY THE SENSING MECHANISM FOR CONTROLLING THE DELIVERY OF THE PUMP IN THE SENSE TO MAINTAIN THE ROTATIONAL SPEED OF THE OUTPUT SHAFT AT A CONSTANT LEVEL.

Control system of automatically shifting transmissions especially for motor vehicles

Abstract: A CONTROL FOR AUTOMATIC TRANSMISSIONS OF VEHICLES DRIVEN BY AN ENGINE, IN WHICH A FIRST ROTATIONAL SPEED CONTROLLER ASSOCIATED WITH THE TRANSMISSION CONTROLS THE SHIFTING-UP LIMITS IN THE TRANSMISSION AND THE DRIVING ENGINE INCLUDES A SECOND ROTATIONAL SPEED CONTROLLER LIMITING ITS MAXIMUM ROTATIONAL SPEED, THE TWO ROTATIONAL SPEED CONTROLLERS ARE THEREBY SO CONNECTED THAT ONE OF THE ROTATIONAL SPEED CONTROLLERS ASSUMES SIMULTANEOUSLY THE FUNCTION OF THE OTHER.