Abstract: Electrographic stylus recording apparatus for producing a magnetically attractable toner powder image on a receptor belt including two rotatable cylindrical sleeves, each having a non-rotatable magnetic roll, with one sleeve positioned adjacent the upstream side of a stylus array and the other sleeve adjacent the downstream side with each of such sleeves adapted for connection to a d.c. source, the upstream sleeve being connected to a d.c. source to place toner powder on the receptor belt for delivery of toner powder to the stylus array when a toner image is to be made and the downstream sleeve being connected to a d.c. source to place toner powder on the receptor belt from such sleeve for return to the upstream side of the stylus array via the receptor belt. The magnet rolls within the sleeves are positioned to provide like magnetic poles to the stylus array to provide a magnetic flux at the recording ends of the styli in the array.

Abstract: An improved electrographic stylus recording apparatus wherein magnetically attractable toner powder used during imaging, but not forming a part of a toner image, is returned from one side of a stylus array to the toner powder hopper of the apparatus. The toner powder is transported around the stylus array by the use of fixed magnets disposed within two rotatable cylindrical sleeve members disposed on opposite sides of the stylus array. A further cylindrical sleeve member having a rotatable magnetic field producing means within the sleeve attracts toner powder from the cylindrical sleeve disposed on the toner powder hopper side of the stylus array for delivery to the toner powder hopper.

Abstract: Circuitry for control of the level of light output from a laser diode that is adapted to direct its light output to a resonant scanning mirror including a biasing current circuit portion for providing a current level for the laser diode at a desired set point and a circuit portion connected to the laser diode which reduces the current through the laser diode by an amount that is inversely proportional to the velocity of the scanning mirror so the amount of light energy received from the scanning mirror at any portion of a scan surface covered by the scanning mirror will be the same when the laser diode is on. Another circuit portion is also connected directly to the laser diode to selectively reduce the current through the laser diode to a level that is below the laser diode threshold current in accordance with binary signals supplied to such circuit portion.

Abstract: Circuitry for controlling the amplitude of a self-resonant scanner including a first means for measuring the time to complete a number of full cycle scanner movements, a second means for measuring the time to complete a number of movements between a first fixed point and a second fixed point in the scan path and logic means using such time measurements to determine whether the scanner amplitude is greater or less than a desired amplitude and providing digital information to produce an analog signal for controlling the scanner amplitude to reduce any difference from the desired amplitude.

Abstract: A mounting structure for a flat, narrow, metallic strip for mounting the strip on a sheet of paper which includes a piece of paper to which the metallic strip is adhered by an adhesive carried on one surface of the adhesive. The piece of paper is dimensioned to provide a border with adhesive that extends about the periphery of the metallic strip. The structure can be stored on Kraft paper to which adhesive does not permanently adhere.

Abstract: Circuitry and apparatus for stabilizing the output of a laser diode when modulated with a wideband analog signal. The circuitry provides for continuous operation of the laser diode with a pin diode positioned for receiving a portion of the output from the laser diode via optics positioned between the laser diode and the pin diode. The optics includes a collimator, a linear polarizer and a polarization beam splitter. The circuitry includes a high gain amplifier which receives the analog signal with a compensating network connected between the amplifier output and the laser diode. The circuitry also has a feedback circuit portion including the pin diode connected to one input of the amplifier.

Abstract: A teleconferencing audio-graphics system using control signals transmitted by a transmitting station to control the operation of an overhead transparency projector and a motor driven roll mechanism that moves the transparency graphic copy output provided by a graphics copy output device over the transparency receiving platen of the projector. The graphics copy output device provide the transparency copy output in response to electronic input signals received from the transmitting station.

Abstract: Compensation circuitry for a laser printer using a self-resonant scanner wherein a clock generator (VCO) and an address counter operated between start of scan (SOS) and end of scan (EOS) signals are used in the generation of data clock signals. A flip-flop circuit is connected to receive the EOS signal and the output from a higher order bit output of the address counter to provide logic circuitry with an indication of whether the clock generator (VCO) frequency should be raised or lowered. The logic circuitry provides an input to a digital to analog means which is connected to the control input of the clock generator (VCO).

Abstract: Apparatus for transferring images of conductive toner powder from a layer carried by a rotatable, electrically conductive member to a dielectric material carried by a rotatable, electrically conductive, cylindrical member. A d.c. voltage supply is connected between the two conductive members and the two members are positioned so the layer on the one and the dielectric material on the other are separated by a slight air space.

Abstract: Data clocking circuitry providing data clocking signals usable to control the output of a laser directed to a self-resonant mirror of a scanning apparatus. The circuitry selects clock signals from the output of a stable clock in accordance with a program stored in a memory and with the output of a voltage controlled oscillator (VCO) used to provide the data clocking signals with the VCO provided with a control signal based on the difference in the accumulated count between the selected clock signals and data clocking signals.

Abstract: Apparatus for adjusting the position of a movable doctor blade structure. The apparatus includes a block member that presents an inclined surface to a contact made with the doctor blade structure. The block member is moved relative to the contact made with the doctor blade structure to alter the position of the doctor blade structure by rotation of a screw that is captively held in a support means and is threaded to the block member.

Abstract: Apparatus for conveying magnetically attractable particles from a first position to a second position including a support member, such as a disc, adapted for rotation and having at least one surface area at which a magnetic field is presented that passes between the first and second positions. More than one support member, each having at least one surface area at which a magnetic field is presented provides another arrangement wherein the support members are serially arranged to extend between the first and second positions so the magnetically attractable particles are carried from one support member to the next.

Abstract: Clocking circuitry for providing clocking signals in accordance with a preprogrammed sequence of rates. An addressable memory is included having data defining such rates with a voltage controlled oscillator (VCO) controlled via data from the addressable memory. An address producing means is controlled by the clocking signals of the VCO to provide an address signal for the memory in response to each clocking signal. The clocking circuitry is used with a moving mirror for a laser printer apparatus, the mirror having a known repetitive movement which is used in establishing the preprogrammed sequence of rates.

Abstract: A temperature compensated control circuit in an electrophotographic copy machine having a machine "ready" portion for presenting a machine ready condition and with which an intermediate copy sheet is used for exposure to the output of a light source including a time adjustable control circuit portion providing a time period during which the light source is energized. The time adjustable control circuit portion has a temperature sensitive element for shortening the time period as the temperature within the machine increases and for lengthening the time period as the temperature within the machine decreases. Such automatic temperature adjustment compensates the exposure time versus temperature relationship of the intermediate sheet.

Abstract: An electrographic stylus recording apparatus wherein magnetically attractable toner material is moved from a toner material dispensing apparatus to a nonrotatable cylindrical sleeve bearing an imaging stylus array where a rotatable magnetic means within the sleeve functions to move the toner material to the stylus array with excess and nonimaging toner continuing to a flange means on the sleeve which directs the toner material to at least one chute for return to the toner dispensing apparatus. Electrical conductors for the stylus array extend from the stylus array and about the sleeve to a position between the flange means and the toner dispensing means where the conductors are positioned to extend outwardly in a generally radial direction from the sleeve for connection to driver circuits.

Abstract: A copy machine having an eddy current proximity detector positioned so relative movement is provided between the detector and a document to be copied. The detector is connected to control logic circuitry for the copy machine so that the copy machine is prevented from producing a copy when the detector detects metal carried by the document. A document cover position indicating device is also connected to the control logic for the copy machine so that closure of the document cover is required for the production of a copy.

Abstract: Electrographic apparatus providing electrographic stylus recording using magnetically attractable toner powder supplied to a recording region while electrical signals are applied to styli to deposit toner powder onto a receptor recording member. At least one side of the stylus array has a rotatable sleeve member with an enclosed magnet disposed near the stylus array to remove excess toner powder that is magnetically drawn from the recording region. A toner removal means removes toner powder drawn to the sleeve member for return to a toner powder hopper. The toner removal means can be a stationary sleeve within which a rotatable magnetic assembly is carried. The stationary sleeve is positioned near the rotatable sleeve to remove toner powder that is carried by the rotatable sleeve. Toner powder is directed to a flange on the stationary sleeve and, then, to a pathway providing for return of the toner powder to the toner powder hopper.

Abstract: Electrographic imaging apparatus which includes a portion for producing an unfixed or nonpermanent toner powder image on a first receptor in accordance with electrical signals, a second portion for providing a light image from the toner powder image with a third portion operated to carry out an electrophotographic process for producing a permanent image on a second receptor. The third portion includes a photoconductive member which receives the light image from the second portion to provide a latent image that is developed and transferred to the second receptor to provide the permanent image.

Abstract: Improved telephone cable conductor pair identifier apparatus incorporates an "Expander" which is interposed at an appropriate location in the amplifier and filtering circuitry between the pick up probe and the audio signal emitter, or speaker. The "Expander" acts to accentuate the differences in the amplitudes of signals present, thereby significantly enhancing the effective sensitivity of a human operator to signal amplitude differences, with a resulting remarkable improvement in the ability of the human operator to readily and accurately locate and select a telephone cable conductor being sought. Switch means may be provided to permit the "Expander" to be bypassed at the will of the human operator, since it may be desirable to use the "Expander" only in the more difficult cases of conductor pair identification.

Abstract: A data processing form for providing control information to apparatus, such as facsimile machines, having a scanner. The form has darkened areas which establish a row and column format with an elongate edge mark provided for each row. The edge marks extend to the edge of the form. Areas to be filled in by a user are defined using some of the darkened areas. The form format minimizes the software needed for circuitry used to process the information obtained from the form serving to reduce the time needed to scan the form.