Abstract: To repair conductor path interruptions on printed circuit boards by means of micro-resistance welding, a specifically shaped metallic part is sucked on a central electrode by use of vacuum. The central electrode lowers the part so as to bridge the conductor path interruption to be repaired. On each side of the central electrode an outer electrode is provided which are lowered into contact with ends of the shaped part to provide independent micro-resistance welding at each end thereof by use of separate welding pulses, with the central electrode functioning in common for each welding.

Abstract: A rotation detector wherein a rotary disk formed with slits in the circumferential direction thereof at predetermined regular intervals and connected to a driving source is disposed between a light emitting element and a light receiving element, and the light sensed by the light receiving element is intermittenlly interrupted by rotation of the rotary disk, whereby rotation of the driving source is detected. One of the rotation detectors is of such an arrangement that a parallel circuit is constituted by a resistor and a series circuit including a feedback resistor and a switching element, and this parallel circuit connects a power source and a light emitting element. Additionally, another of the rotational detectors is of such an arrangement that a comparator, in which a reference level is set, is used to compare outputs from a light emitting element with the reference level.

Abstract: A single or multiple pole key switch having a molded plastic housing formed with snap-in devices for mounting connection with a support and having a key stem reciprocatingly movable through one wall of the housing and having multiple guide surfaces thereon cooperating with corresponding surfaces of said housing for minimizing rotation, wobble and binding of the key stem in operation. The lower end of the key stem engages a return spring and is provided with at least one lateral cavity for carrying at least one contact spring for cooperation with stationary contacts mounted on a terminal block mounted in opposing adjacency thereto. A detent bar is provided on the terminal block to radially deflect the contact spring during key stem operation which provides the operator with "feel" of the switch action and produces an adjustable hysteresis or differential between the make and break of the contacts to avoid unwanted contact opening or closure and afford dampened make and break contact action.

Abstract: An electronic switching device is described for use with microprocessors and other memory containing devices. The electronic switching device can be adjusted to provide control signals out to the microprocessor or other memory containing devices when the supply voltage common to all units goes above or falls below predetermined values. The control signals substitute an auxiliary voltage for the supply voltage when wide fluctuations occur. Further, the control signals introduce delays which allow the microprocessor or the memory containing devices to complete an internal processing step before switching in the auxiliary voltage.

Abstract: A sealed electrical contact assembly comprises a dielectric frame in which a plurality of aligned stationary electrical contact members are secured as opposing sets of contact members and movable electrical contact members interconnect each set of stationary contact members. One of the opposing sets of stationary contact members and the movable contact members have mateable pivot areas at which the movable contact members are mounted so that the movable contact members can be moved to a position electrically connecting the opposing sets of stationary contact members. A membrane is sealingly secured onto the frame covering each set of stationary and movable contact members associated therewith.

Abstract: The invention provides a vacuum interrupter in which an evacuated envelope includes a cylindrical housing made of a metallic material, disc-shaped upper and lower end plates made of inorganic insulating material and stationary and movable contact rods. The envelope of the vacuum interrupter is manufactured by brazing the end plates to the housing by using a sealing member made of a plastically deformable metallic material which is deformed by thermal stress generated during a cooling process after hermetic brazing. The coefficient of the housing differs from that of the upper and lower end plates. According to the present invention, the sealing performance can be enhanced, even when the thermal coefficient of the housing differs from those of the end plates, since the sealing member is used.

Abstract: A single-ended switching circuit is constituted by a primary winding of a transformer, a switching circuit connected between the primary winding and a DC power supply and on-off operated with a predetermined cycle and also with a predetermined "on" period and a resonance capacitor connected in parallel with the primary winding. A magnetic amplifier, a rectifying element and a choke coil are connected in series between a secondary side circuit of the transformer and the load. The magnetic amplifier includes a saturable reactor which is held saturated during a half cycle of the voltage induced in a secondary winding of the transformer and remains unsaturated during the other half cycle of the voltage.

Abstract: A universal input-output apparatus has: a controllable source of electrical energy including at least one drive source having an output terminal and a return terminal; an electrical energy measuring device including at least one energy sensor having an input terminal connected to the output terminal of the controllable source of electrical energy; a twin leaded line having the first ends thereof connected to the output and return terminals of the drive source, respectively; and an integrity tester in the form of a zener diode connected across the second ends of the first and second leads, respectively, a first terminal connected to one of the second ends, a second terminal connected via a unidirectional conductor to the one second end and a third terminal connected via a resistive device to the one second end.

Abstract: In an apparatus for detecting neutral state of a manual transmission for motor vehicles, a first and a second recess are provided which are movable with a first and a second shift rod, respectively. A swingable arm is provided which is arranged to be disposed in engagement with both the first and second recesses only when both the first and second shift rods are in their neutral positions. A switch means is provided which is arranged to be closed when the arm is disposed in engagement with both the first and second recesses, and opened when the arm is disposed out of engagement with first and second recesses.

Abstract: A method of driving a thermal printing head includes expanding the printing time for a line which follows successive non-printed (blank) lines. In this manner, deterioration otherwise caused in the print density can be avoided without employing an auxiliary heater for the thermal head. Instead of expanding the printing time, the applied voltage may be increased to achieve the same result.

Abstract: A waveform generator (FIG. 1) contains a static energy storage device circuit in which storage devices (C1 through C6) are interconnected in a fixed topological configuration. The storage device circuit has a plurality of input and output terminals (12 through 18). Charge storage is accomplished by controllably steering (20, 40) a supplied DC signal (10a,b) to a selected one, or selected ones, of the storage devices via the appropriate input terminals. AC waveforms are generated (11a,b) by controllably selecting (30, 40), in predetermined sequence, each output terminal of the storage device circuit.

Abstract: In a thermal printing head for use in a facsimile printer or the like, unevenness of printing consistency occurs which is due to temperature variation of the thermal resistor elements and due to the difference in printing data resulting from black record information or white record information of the printing data for the preceding line. A printing pulse control circuit for the thermal printing head stores the information for the preceding line, and applies a printing pulse of smaller pulse width to the thermal resistor elements heated by the black record information for the preceding line and a printing pulse of larger pulse width to the thermal resistor elements not heated with white record information for the preceding line to make uniform black printing consistency for the present line irrespective of the type of printing data for the preceding line.

Abstract: A hydrocarbon responsive switch provides an elongated flexible member which is impervious to hydrocarbon substances, a hydrocarbon absorber bonded to the elongated flexible member for absorbing hydrocarbon substances in contact therewith and for swelling from the absorbing for causing the flexible member to bend, a mounting for one end of the elongated member, a first electrical contact located at the other end of the elongated member, and a second electrical contact for contacting the first contact upon bending of the elongated flexible member and thereby making electrical connection in response to the absorption of hydrocarbon substances by the absorber.

Abstract: A quick open and close disconnect switch suitable for use in EHV and UHV systems is disclosed. In addition to a conventional main moving contact and a conventional mechanism for operating it, a preferably much smaller, lighter auxiliary moving contact is provided. The main moving contact is moved away from (or toward) the stationary contacts to open (or close) the switch. While this is happening, the auxiliary moving contact is retained by means of a latch arrangement in its position engaged with (or remote from) the stationary contact. When the main moving contact has traversed a predetermined portion of its path, the auxiliary moving contact is released and is moved suddenly, with great speed, to its open (or close) position. The motive power for the auxiliary moving contact is preferably provided by a power spring which is compressed by the movement of the main contact.

Abstract: An electric switch is either automatically actuated by a motor driven timer or manually actuated, as determined by turning a three-position selector. The timed switch may be used with a conventional motor-driven clock and uses a commercially available microswitch which can provide either timed-"ON" or timed-"OFF" operation. Rotation of the selector in either direction causes longitudinal displacement of a spring-loaded actuator, which operates the switch. The selector has latching arms which are latched either in a manual position or in the automatic timed position.

Abstract: The rotating program drum of the timer operates the timer switches in a predetermined sequence. One or more timer switches can be disabled to omit the function of the switch. Means are rotatably mounted in the frame to move a passive switch blade away from the active blade so the active blade cannot contact the passive blade. In two embodiments the disabling means operates on a switch at the end of the program drum while a third embodiment can operate on any of the switches operated by the drum.

Abstract: This invention relates to a system for controlling the amount of print material supplied to an electronic printer and, more specifically, for controlling the amount of ink or toner supplied to the sump of an ink jet printer or a photoelectrostatic copier that is used as a printer, respectively. The supply of print material is controlled by a determination of the amount of material that would be required to print a given text. This determination is based upon a knowledge of how much print material is required for various characters and the make-up of characters in the text.

Abstract: A dual voltage engine starter system having a first battery pack (B) for supplying power to the system and a second battery pack (A) and contactors (SC,PC) for connecting the battery packs in series mode for cold weather starting or in parallel mode for warm weather starting, a pilot relay (SPR) for controlling the standard start solenoid (SOL), and a starter contactor (SMC) that controls the starter motor (SM) circuit to protect the solenoid contacts (SOL1). A control logic system (FIGS. 2a-b) has a single timer (TMR) and a sequencing timer circuit (STC) for controlling the contactors and relay in particular sequences, both for high and low voltage start cycles and for starting and terminating start cycles. A low voltage detector (LVD) controls a start-terminate latch (STL) to abort the start cycle if the start motor (SM) voltage is too low. A frequency sensor (FS) sets the latch (STL) to end the starting cycle when the engine reaches running speed.

Abstract: Apparatus and methods for replacing or repairing missing or damaged abrasion resistant wearbars utilized in high velocity cyclone boilers. A retrofit wearbar having an aperture therein is utilized in conjunction with an end weldable stud wherein the wearbar and stud are placed in position over a damaged wearbar or against the boiler tube in the case of a missing wearbar and the stud end welding technique utilized to fuse the wearbar and stud in place with the damaged wearbar or boiler tube in the case of a missing wearbar in situ. An arc shield is utilized which has a projection from the weld fillet cavity thereof which cooperates in conjunction with the aperture of the retrofit wearbar to provide alignment of the stud in the wearbar and prevent shorting of the stud to the wearbar during the welding cycle.

Abstract: A fluid pressure operated spot welding apparatus is disclosed, in which one of a pair of electrode arms initially is moved from a closed position of the electrodes in a rectilinear path perpendicular to the other electrode, and subsequently is swung in an arcuate path to a retracted position in which the said one electrode is positioned rearwardly and remote from the said other electrode, the apparatus also providing for the substitution of alternative workpiece supports in a readily interchangeable manner.