Abstract: An interlock switch module for a microwave oven provides a unitary housing containing primary and secondary interlock switches, interlock and logic monitor switches, and a cavity lamp switch. Apertures are provided in the housing to receive actuators external of the switch module. One actuator is contained within the module and is adapted to be actuated by a portion which protrudes from the module. Sequencing and timing of the switches are provided for.

Abstract: An automatic grease feeding system to provide for lubrication to variable pitch pulleys is disclosed having a stationary grease feeder providing pressurized grease lubrication through a stationary to rotating interface with the shaft carrying variable pitch pulley.

Abstract: A mode detector for microwave oven magnetrons is disclosed including means for sensing interruption of anode current and providing a discrete indication thereof. An alternative embodiment discloses means to count the number of such interruptions. A method of detecting incipient failure of the magnetron is disclosed wherein the discrete output of a mode detector is observed and a determination is made that an incipient failure exists when the mode detector output frequency exceeds a predetermined limit.

Abstract: A stator winding configuration employs graded, overlapping stator winding coil groups. The outer coils of the coil group have a reduced number of turns with respect to the center coil or coils of the group. The coil groups have an expanded coil group width. The outer coils of adjacent, expanded width coil groups are overlapped by placing the reduced turn outer coils in common slots in the stator core.

Abstract: A voltage limit circuit for phase controlled rectifiers avoids shoot-through and limit cycling conditions by limiting the d.c. output voltage of the rectifier bridge. The circuitry follows a voltage reference signal as long as the reference signal is less than an input derived from the a.c. voltage applied to the bridge, reduced by the volt-seconds required for commutation. Should the reference signal exceed the a.c. derived input, the a.c. derived input limits the maximum available d.c. voltage. To this end, a voltage reference signal provides an output signal corresponding to the desired output voltage of the bridge. A slew limit circuit limits the rate by which the output signal may be changed. A magnitude limit circuit is coupled to the output of the slew limit circuit and provides a reference signal for the firing circuit of the rectifier bridge. The magnitude limit circuit receives the a.c.

Abstract: A bearing mounting assembly for rotating anode X-ray tubes is disclosed having a pair of spaced apart bearings mounting a rotating shaft within a hollow bearing housing. A sleeve circumscribes the bearing housing and has shoulders engaging a spring washer to provide axial positioning and preloading of the bearings through the spring washer by means of radially disposed set screws in the sleeve engaging the bearing housing.

Abstract: A timing generator for use with multi-phase controlled rectifier systems is disclosed in which a ramp signal is produced in phase synchronization with the power source and compared with the value of a command signal. The command signal is indicative of the desired SCR ignition angle. A sequencing circuit, having a finite number of output states is cyclically stepped from one state to the next by a comparator. The sequencing circuit couples a source of SCR-gating pulses to the appropriate SCR in accordance with its state and with a predetermined pattern of SCR ignitions which characterize the multi-phase source.One aspect of the invention provides the multiplexing of the comparator output whereby the command signal is offset by 60.degree. (electrical) after each comparator transition to set up conditions for the next transition.A further aspect of the invention provides for the generation of an alternate ramp, 180.degree.

Abstract: The tachometer of the present invention has a stator member with a pair of opposed stator elements. The stator member is mounted on the apparatus. Windings are provided on the stator elements in which the electric signal is generated.A magnetic means is provided for establishing a magnetic flux between the stator segments. For this purpose, magnets may be mounted on the exterior of the stator segments and the portions of the apparatus adjacent the segments used as the flux return path. Or, magnets may bridge the two stator segments.A magnetically permeable rotor is mounted on the apparatus shaft. The rotor may be formed of steel laminations with no rotating winding and has a plurality of peripheral projections that alter the reluctance of the magnetic path in the teeth as they rotate, inducing a speed responsive signal in the windings. The maximum speed of the rotor is limited only by the strength of the steel.

Abstract: An improved PBL X-ray system in which the collimator is automatically adjusted so that the X-ray field size at an image receptor conforms to the image receptor size and the X-ray source to image receptor distance. Swivelling of the collimator in a plane parallel to the image receptor is detected and operation of the X-ray source is disabled. Manual operation may be obtained by removing the image receptor from its holder. Swivelling the collimator plus or minus 90.degree. exchanges the normally detected image receptor cross and longitudinal dimensions to automatically realign the collimator and image receptor axis. A PBL time delay is provided to prevent premature and undesired operation of the collimator shutters.

Abstract: Method and apparatus for controlling the food cooking time in a microprocessor controlled microwave oven in response to the remotely sensed condition of the food being heated. The average food temperature is constantly derived during cooking, utilizing user entered data on the food category, the food's initial mass, and the measured input power to the magnetron. The average current and average peak voltage input to the magnetron are sensed and the absorbed power in the food is derived using the magnetron efficiency. A self-calibrating analog to digital converter provides the magnetron input power in digital form for a microprocessor controller. In one embodiment the microprocessor sequentially derives the average food temperature as a function of cooking time using the entered food data, stored cooking coefficients previously determined by regression analysis, and the measured magnetron input power.

Abstract: In an electric motor operating with a liquid filled housing, friction and hydraulic losses are reduced and heat removal is improved. A first collar is mounted on the end of the stator coaxially therewith. A second collar is positioned in proximity to the first collar. An annular plate extends from the second collar and faces the end of the rotor. The plate is spaced from the end of the rotor and from the rotor shaft. The rotor has a surface opposing the annular plate. The collars and annular plate form a liquid turbulence reducing shroud for the end of said rotor. The opposing surfaces of the annular plate and rotor move liquid outwardly toward the stator bore and the collars divert the liquid down the air gap for heat removal purposes. The first collar protects the end turns of the stator from abrasion by the moving liquid.

Abstract: An improvement in Source-to-Image Distance monitors for automatic adjusting X-ray radiography equipment having a cable, rewind spring, a self-traversing constant diameter takeup drum moving past a fixed aperture, an electrical potentiometer to provide a continuously varying electrical output signal and a snap action switch mechanism to indicate relative movement of the X-ray apparatus being monitored.

Abstract: A control circuit for apparatus stretching a web between intake, discharge, and intermediate pulling stations (20-1, 20-2, 20-3). The circuit includes a first signal generator (32) for providing a signal to the intake discharge station (20-1) corresponding to the desired speed of the web at that station. A multiplier (40) alters the first signal in accordance with the amount of overall stretching, or stretch ratio, desired in the apparatus. The multiplier provides a second signal to the discharge station (20-3) corresponding to the speed of the web at the discharge station necessary to obtain the overall stretching. A second signal generator (48-66) subtracts a selected amount of the difference between the first and second signals from the second signal to provide a third signal to the intermediate pulling station (20-2) that distributes the overall stretching in the apparatus between intermediate zones formed by the adjacent pulling stations.

Abstract: A front programmable timer provides for the programming, selecting, and operating according to desired operating times in a set of input switches for a microwave oven controller. Retention of the times programmed is provided for in the event of loss of power. A TEST mode provides for exercising a visible display, an audible indicator and a microwave command output signal from the controller. A tamper-proof switch assembly is provided to select OPERATE or PROGRAM modes.

Abstract: A liquid-cooled eddy-current coupling device is disclosed, having a field coil and rotatable inductor and rotor members within a housing, with the rotor member having a tubular extension with an exterior circumferential groove disposed to direct liquid coolant away from the field coil.

Abstract: An apparatus and method for controlling cooking in a microwave oven whereby the power input to the cooking cavity is held at a predetermined, constant level. Available line power is measured through a winding or tap on the high voltage transformer secondary and the duty cycle of the magnetron power supply is adjusted to maintain a constant average power output.

Abstract: A cylindrical lens-prism light-line generating apparatus utilizing a slit-type aperture provides for origination, collimation and projection of a light-line which cooperates with a light localizer beam in aid of aligning an X-ray beam path preparatory to radiography.

Abstract: A method of browning food in a microwave oven. The method comprises alternating over the entire cooking cycle the application of power to a microwave generating device with the application of power to an infrared heater. The operational periods of each type of radiation device are automatically varied over the cooking cycle. The parameters of these periods are empirically predetermined for each broad category of food and retained in a nonvolatile memory. In one embodiment, the periods are adjusted to compensate for varying quantities of food and desired donenesses by relating them to a total cooking time per unit mass empirically predetermined for each food category and doneness. Alternatively, the periods are adjusted by entering the food mass into a microprocessor in the oven. The microprocessor calculates the cooking time by use of the food category, food mass and power input to the microwave generating device.

Abstract: An X-ray collimator is disclosed having longitudinal and cross shutter assemblies disposed between an input port and an output port. Image area boundaries are defined by two pairs of inner edge portions. Mating inner edge portions of each pair move in an essentially rectilinear path.

Abstract: Electrical apparatus includes electrical coil means formed of multiple turns of enamel-covered electrical wire axially mounted on a core of magnetic material in electromagnetic energy coupling relationship therewith, and a relatively flat flexible electrical cable containing a plurality of spaced parallel conductors extending between the cable ends contains a loop shaped portion extending about an axis of said core over an arcuate distance greater than 180 degrees.