Abstract: The present invention is a sample data control system having (a) a charge control loop for eliminating photoreceptor dark discharge variations due to photoreceptor fatigue and aging to maintain a constant dark development potential, (b) an illumination control loop eliminating variations in the lamp irradiance to maintain a constant background potential, (c) a toner dispensing control loop regulating toner flow using a sensor approach directly sensing developed images to eliminate toner mass variations and (d) a bias control loop to maintain optimum density images on the photoreceptor in spite of changing humidity conditions. Two test targets, each having two test patches are selectively exposed in various combinations to provide test data in the photoreceptor image area for suitable sensing and control of the charge, illumination, toner dispensing, and bias control loops.

Abstract: An electronic system for controlling the speed of a shaded-pole single-phase induction motor provides increased power during speed increase and automatic braking during slowdown by regulation of half-wave D.C. braking current applied to the motor.Speed control during normal operation, and braking control during slowdown and stopping, are implemented by means of dual feedback loops interactively connected to the gate electrode of a triac in the A.C. current line of the motor. The speed control loop utilizes a frequency/phase detector to adjust the time delay of triac gating relative to the zero crossing points of each half-cycle of A.C. voltage until the tachometer-sensed speed of the motor corresponds to a desired speed set by a voltage controlled oscillator. The braking control loop adjusts the time delay of the triac gating relative to the zero crossing points of every alternate half-cycle of A.C. power thus decelerating the motor by an impressed half-wave pulsed D.C. current.

Abstract: A motor control circuit includes a chopper circuit (11) including a main switching element (14) which is connected in series with the motor armature (12). The chopper is controlled by a Schmitt bistable circuit (34) which operates to switch the main switching element on when the actual motor current falls more than a set amount below a demanded level and off when the actual motor current rises more than a set amount above the demanded level, the demand level is determined by the driver's pedal controlled potentiometers (37, 38) but is required to be modified in accordance with the motor speed. Instead of using a mechanical speed transducer, the present invention includes a circuit (40) which is connected to the output of the bistable circuit (34) and produces a signal varying in accordance with the ratio of the on and off times of the main switching element.

Abstract: An electrophotographic recording device suitable for a Form Overlay System, by which a latent image is formed on a surface of a light-sensitive recording medium, consisting of a first area which is maintained at an original potential, a second area which is maintained at a partially reduced potential and a third area which is maintained at a potential of zero.

Abstract: A triple function image processing system incorporating, for operation in a first COPY mode, a light/lens imaging system for imaging originals at a viewing station or platen to produce latent electrostatic images thereof on a photoconductive surface. The electrostatic images are developed and transferred to a copy substrate material as in conventional xerographic systems. A flying spot light beam is provided in a second WRITE mode, the flying spot beam writing images on the photoconductive surface in response to image signals input thereto. In this mode of operation, the beam impinges on the photoconductive surface at a location upstream of the developing device. And, in a third READ mode, the beam is impinged on the photoconductive surface downstream of the developing device to scan images developed on the photoconductive surface. The scattered light is collected and converted to image signals representative of the image scanned.

Abstract: A novel stator assembly, D.C. electric motor, and method of controlling the speed of the motor is described. The stator assembly includes a pair of field poles, each having a field coil wound around a shank portion, and a plurality of separately excitable field control coils wound individually around the field pole legs defining a face portion of the field poles. The field poles also have a core portion which provides a magnetic path between the shank and face portion. This core portion permits the magnetic flux in the field poles to shift across the face portion when one or more of the field control coils are energized magnetically subtractive to the flux generated by the field coils. The speed of the motor may be controlled by energizing the field control coils and controlling their polarity with respect to the field coils. A motor controller for the motor according to the present invention is also described, and is particularly useful in an electric vehicle application.

Abstract: An apparatus which controls the lateral alignment of a belt arranged to move in a pre-determined path. A pivotably mounted belt support is frictionally driven to move in unison with the belt. Lateral movement of the belt applies a frictional force on the belt support. The frictional force tilts the belt support in a direction so as to restore the belt to the predetermined path of movement.

Abstract: In an effort to condition a battery for its current supply function, the electric charge required to restore the battery from a given first level to a higher second charge level is determined. A conditioning operation is comprised of a first step of reducing an unknown electric charge in the battery to the given first level, and a second step of introducing only the determined required electric charge into the battery. The battery is conditioned by administering in sequence the first step to reduce the unknown electric charge to the given first level and the second step to restore the battery to the higher second charge level by introduction of only the determined required electric charge into the battery.

Abstract: The present invention is a sample data control system having a toner dispensing control loop regulating toner flow using a sensor approach directly measuring developed images to eliminate toner mass variations, and a bias control loop maintaining optimum density images on the photoreceptor in spite of changing humidity conditions. Two test targets, each having two test patches are selectively exposed to provide test data in the photoreceptor image area for suitable sensing and control of the toner dispensing and bias control loops.

Abstract: A light scanning assembly for apparatus including a copyboard, an optical train and a carriage carrying charging, exposure and toning devices. The copyboard is movable from a horizontal disposition to a vertical disposition at which it is scanned in synchronism with simultaneous movement of the carriage horizontally. The light scanning assembly comprises a support bracket mounting a pair of illuminating lamps disposed each with an associated elliptically configured reflector. The support bracket is driven translating the lamp pair and their common intersection band across the face of the copyboard synchronously with the movement of the carriage. A third lamp is mounted (with reflector) on a second bracket to illuminate through the copyboard and is movable vertically with the first bracket. The third lamp is energized only when a transparent document is carried by the copyboard. The first pair of lamps are not energized at that occasion.

Abstract: A speed control trigger switch of a double-pole configuration. One pole of said switch is an ON-OFF switch, while the other pole controls the speed control circuit. A contact carrier block (20) carries the two movable contacts (22,38), one for each pole of the switch. As the carrier block begins to move, the contact for the speed control side closes the speed control circuit by contacting two contacts, a contact/terminal (26) and a heat sink (24). As the block continues to move due to continued pressure on the trigger (16), the speed of the motor controlled by the switch continues to increase until the FULL-ON position is reached when the movable contact (22) closes the gap between the two contact/terminals (26,36). The contact portion (36a) of that contact/terminal is located between the other contact/terminal (26) and the heat sink (24) for efficiency and compactness of design.

Abstract: A first capacitor is discharged with every pulse of a train of pulses of a frequency proportional to the actual speed of a rotary machine under control and is charged up during intervals between these pulses. The voltage of the first capacitor provides a signal to a threshold circuit which operates to provide a second signal whenever the voltage of the first capacitor exceeds a predetermined voltage which may be set in order to set the speed at which the machine is to be controlled. During the presence of the second signal a second capacitor is charged, beginning at a predetermined voltage, preferably zero. The regulating magnitude for the machine to be controlled is derived from the voltage of the second capacitor either directly or indirectly through a controller circuit and a power stage. The circuit is particularly useful for control of the speed of machines that run slowly or can conveniently provide only relatively few speed-indicating pulses per revolution.

Abstract: An electronic safety device circuit is disclosed. This circuit includes two integrated circuit operational amplifiers, the first connected as an operational amplifier and the second connected as a follower. The output pin of the first amplifier is connected to the positive input pin of the second amplifier through a diode. The positive input pin of the second amplifier is connected to a memory capacitor. The output pin of the second amplifier is connected to the negative input pin of the first amplifier. A switching network is provided for grounding the positive input pin of the first amplifier and discharging the memory capacitor.

Abstract: Apparatus for precise center registration of a sheet with respect to a fixed reference line such as the center line in a copier. To accomplish this, a sidewall and an associated sensor move in unison relative to the machine center line. With the sheet registered against the sidewall, the sidewall and the sensor which are maintained equidistant from the machine center line move until the sensor senses the edge of the sheet. The motion is then stopped by a signal from the sensor thereby providing precise center line registered sheets.

Abstract: In superposing a copy web and a photosensitive member one over another and transferring a toner image of the copy web by transfer printing from the photosensitive member carrying a toner image of an original formed by following the steps of charging the photosensitive member, exposing the photosensitive member to an optical image of the original to form an electrostatic latent image thereon and developing the electrostatic latent image, one of the copy web and the photosensitive member is driven and the other is driven by the frictional force and electrostatic attractive force, so that relative movement of the photosensitive member and the copy web can be avoided while they are in contact with one another.

Abstract: A windshield wiper control circuit is described wherein the time at which the wiper motor is deenergized after an operating switch has been switched off is determined by the wiper speed. The parking position of the wiper is thereby independent of the condition of the windshield.

Abstract: An electrostatic copying apparatus comprising a photosensitive layer prepared from a photoconductive material, corona discharge unit which generates a corona discharge to form an electrified corona discharge region on the photosensitive layer, light-emitting unit which is disposed adjacent to the corona discharge unit and emits light beams over the electrified corona discharge region of the photosensitive layer, thereby producing a conductive light-irradiated region on the photosensitive layer, and adjustment device for controlling the dimensions of the light-irradiated region to control the overlapping portions of the light-irradiated region and corona discharge region, thereby selectively defining the substantially electrified portion of the corona discharge region.

Abstract: A method and apparatus for sensing a drill pipe joint is characterized by an arm pivotally moveable with respect to a drill pipe from a first, normal, position. The arm deflects a predetermined angular distance from the normal position when it comes into contact with a predetermined distended location on a drill pipe. An electrical signal is generated by a signal arrangement associated with the arm to indicate that the predetermined distended location is reached.

Abstract: Factors affecting copy quality are continuously adjusted during copying in accordance with the actual charge on the photoconductor relative to a fixed reference potential. The photoconductor, carried on a moving, partially exposed, constant potential conductive support, is sensed by a probe. The probe supplies a signal as a function of the potential on portions of the photoconductor and the conductive support passing by the probe. A circuit converts the probe signals into digitized values representing the current photoconductor potential relative to the support. The digitized values adjust copier parameters to compensate for deviations of photoconductor potential from predetermined desired values.

Abstract: The operation of a first motor and a second motor generates first and second frequency signals, respectively, which are fed to a phase lock loop (59) for phase comparison. A tri-level detection circuit (61) develops an output signal in response to the phase relationship between the first and second frequency signals. The first frequency signal is converted to a voltage signal by a converter (63) which is fed to an amplifier (64). A feedback circuit (66) is connected across the amplifier and includes several selectable levels of impedance. A switching network (62) responds to the output signal of the detection circuit (61), and thereby in response to the phase relationship between the first and second frequency signals, to connect one of the impedance levels of the feedback circuit (66) across the amplifier circuit (64).