Abstract: A paper handling system for a copier is disclosed. A paper sheet is wrapped around a drum of a copier by utilizing the exhaust air flow of a vacuum to lift the paper to the drum and to hold the paper sheet onto the drum. In addition, if a second paper sheet is lifted to the drum in a double pick situation, the second sheet is returned to a paper tray for subsequent copying thereon.

Abstract: Interface lines interconnect a first circuit to a second circuit. When an abnormal circuit condition affects the interface lines, such as an open circuit or a short circuit condition, the operation of the first and second circuit is detrimentally affected. This invention determines the existence of abnormal circuit conditions in one or more lines of a group of interface lines without using redundant duplex lines. The interface lines are subdivided into a first group, which are used when the apparatus of the present invention is being used to locate abnormal circuit conditions, and a second group, which are not used when the apparatus of the present invention is being used to locate abnormal circuit conditions. Each line of the first group is connected, at its input side, to a corresponding input terminal of a first exclusive-or gate and, at its output side, to a corresponding input terminal of a second exclusive-or gate.

Abstract: A method to measure the real contact surface area of a connector or pin is disclosed. The pin and the connector is Gold plated. The pin or the connector is coated with platinum. The pin surface and the connector surface actually comprise a multitude of peaks and valleys, termed asperites. If the pin is chosen to be coated with the platinum, the platinum coated pin is mated with a connector. A portion of the pin surface contacts a corresponding portion of the connector surface. The portion of the pin surface and the corresponding portion of the connector surface is termed a real contact surface area. The pin and connector are separated. The platinum formerly adhering to the real contact surface area of the pin is removed and adheres to the real contact surface of the gold plated connector. Using a metallograph or a scanning electron microscope, the real contact surface of the connector or pin is studied and observed.

Abstract: A resonant magnetic deflection circuit is disclosed for reducing a retrace period of an electron beam scanning within a cathode ray tube (CRT) apparatus. Opposite polarity flyback voltage pulses occur at both ends of a deflection coil. As a result, an effective retrace voltage appearing across the deflection coil is approximately doubled, thereby reducing the retrace period of the electron beam scanning within the CRT apparatus. One end of the deflection coil is connected to a reference level source through a first parallel circuit and an S-correction capacitor, the other end thereof being connected to the reference level source through a second parallel circuit. The first and second parallel circuits comprise switching devices, damper diodes and retrace capacitors. Moreover, both ends of the deflection coil are connected to a power supply through a flyback transformer.

Abstract: A fiber optic module connector system comprising a quick connect and disconnect optical terminator having several signal channels and an optically terminated module with a built-in retention system for its mating connector. Fiber optic signal lines are rapidly connected directly to light emitting diodes mounted on an integrated circuit chip in the module.

Abstract: In a line scan graphic recording apparatus, the beam which displays the data on the recording media must be synchronized with the movement of recording media as it is directed normal to the displaying apparatus. The rate at which the recording media moves in its path is determined by the paper drive means. The rate is often non-uniform due to instantanteous velocity variations of the drive means. A drive velocity sensor produces a timing signal which controls the recording time of the input data image, stored digitally in a buffer memory device, by triggering the buffering device at the appropriate time and causing the image data to be transferred to the display for recording on the selected media.

Abstract: An input apparatus for a multi-channel device, such as a logic analyzer, is disclosed, the input apparatus providing the multi-channel device with a programmable set-up and hold feature. The multi-channel device acquires a logic signal from a product under test, the logic signal having associated therewith an actual set-up and hold time with respect to an external clock signal. The actual set-up and hold times are entered into the multi-channel device via a keyboard and a display. The device has stored therein a desired set-up and hold time required by the logic signal relative to the external clock signal. In accordance with the actual and the desired set-up and hold times, the multi-channel device changes the relative orientation of the acquired logic signal with respect to the external clock signal, along the time axis until the set-up and hold times of the acquired logic signal are changed from the actual value to the desired value.

Abstract: The present invention relates to a drive circuit for a stepping motor. The drive circuit provides a low voltage to the coils of the stepping motor in the steady state, and a high voltage to the coils when changing state. As a result, the state changes rapidly and the stepping motor is driven efficiently. The high voltage is derived from the energy which was stored in the winding of the stepping motor before the switching occurred by transferring that energy to a capacitor which achieves a charge potential that is greater than the potential of the power supply voltage.

Abstract: The present invention relates to a capability present within a graphics display terminal wherein a zoom operation may be accomplished, the width of each of the lines of the zoomed image being maintained at a one pixel width regardless of the degree or amount of magnification of the zoomed image. This is accomplished by utilizing the firmware stored in the processor to perform the magnification of the image therein, prior to the storage of the appropriate binary data in the video display memory, the binary data being the pixel representation of the displayed image. Since the magnification of the image takes place prior to storage of the binary data in the video display memory, the graphics display terminal of the present invention can use this binary data to display an image, a zoomed image, the width of each line being equal to, approximately, a one pixel width. Therefore, despite the degree of magnification of the zoomed image, a very discernable, clear image will be displayed on the CRT.

Abstract: A scheme for digitizing a stationary video image is disclosed. The amplitude of a video signal, representing said video image, is sampled at a plurality of points along the time axis and is compared with the count in a counter. If the amplitude equals the count at a particular point on the time axis, the count is stored in a memory in a location corresponding to said particular point. The process is repeated until a count in the counter is stored in said memory in locations corresponding to all of said plurality of points along the time axis of said video signal. If two or more counters are used, each counting from a different initial value, and if two or more corresponding comparators are used to make the above comparison, the time required to digitize said stationary video image may be reduced. Consequently, the time required for the video image to remain stationary is reduced.

Abstract: A method and apparatus is disclosed for independently displaying one of a plurality of images on a display and for superimposing the plurality of images onto one another to produce a composite image. One or more bit planes are selected to constitute a group (defined to be a "surface"), and one or more additional bit planes are selected to constitute another group. The number of groups corresponds to the number of images to be independently displayed. The priority of one group over the other is selected. This ensures that the image from the one group (surface) appears to be "in front of" the images from the other group (surface) on the display. In the case of a color terminal, the colors associated with each group are selected. A color map memory contains a plurality of brightness indices which determines image brightness. Associated with each index is one or more color indices.

Abstract: A method for verifying the architectural integrity of a newly written or modified instruction set in a limited operating environment is described. More particularly, this methodology is adapted to perform such verification even though the processor under test has only a one or a few instructions in its partially complete instruction set. Such verification is accomplished using a minimum test driver, under control of a test processor, which loads the data necessary to execute the instruction being tested. The test system also provides actual or simulated I/O capabilities. After execution of that instruction, the test driver directs capture of the execution results for appropriate use. As an aid in performing the verification test, the test driver is provided with an invalid command that forces return of control to the test processor.

Abstract: A joystick apparatus is disclosed having a minimum number of component parts associated therewith. The joystick apparatus comprises a first potentiometer, a second potentiometer, a bracket interconnected between the shafts of said first and second potentiometers, and a joystick connected to the base of one of the potentiometers. The bracket is interconnected between the shafts of the first and second potentiometers in a manner such that a movement of the joystick along one axis will impart a rotational movement to the shaft of one potentiometer, but will not impart a rotational movement to the shaft of the other potentiometer.

Abstract: An apparatus for displaying logic signals on a raster scan type display device is disclosed. A memory circuit stores a plurality of basic patterns corresponding to segments of a logic waveform. The basic patterns are selected from the memory circuit in accordance with the logic signal and are applied to an edge generator for generating an intensity control signal for varying the intensity of an electron beam generated within the raster scan type display device.

Abstract: A process is provided for modifying internal circuits in a multilayer printed circuit board by modifying the glass master which produces the internal circuit patterns. An inexpensive film copy of the glass master to be changed is used to identify the circuit lands to be removed. Holes are made in the film at these locations thereby removing the image of the land and these alterations are verified in accordance with the engineering change instructions. The perforated film is used as a template to alter the glass master by removing the emulsion through the holes in the film and then the glass master is verified and used to produce the modified circuit board.

Abstract: A pressure foot assembly is provided which makes use of a pressure ring mounted in a manner which allows it to float laterally around an end mill cutter which is used to delete circuit lands on a subcomposite printed circuit panel. Enough pressure is provided to keep the ring from rotating and allows the ring to impart a concentrated force very close around the cutter, thus holding the deleted circuit line in place during cutting and keeping cutting burrs to a minimum.

Abstract: The use of an ultrasonically agitated solution which includes UNRESOLVE PLUS and methylene chloride and acetic acid to strip a silicone oil base grease from module caps. The caps are placed in a container of the solution and agitated. They are then removed, water rinsed, and blown dry.

Abstract: A displacement compensating module is disclosed wherein a blocking article, such as a polyimide tape, is disposed between an epoxy composition and the back surface of a substrate and between the epoxy composition and the inner surface of a cap for blocking the movement of the epoxy composition into a gap area during the manufacture of the module. An electronic module comprises a substrate, an integrated circuit chip disposed on the substrate, a cap disposed over and enclosing the chip and the substrate, a heat dissipator disposed between the cap and the chip for carrying away the heat dissipated by the chip, and an epoxy composition secured to the back surface of the substrate for sealing the module, and specifically, the chip within the module from harmful external influences. The boundary of a gap is defined by the edge of the substrate and the inner surface of the cap.

Abstract: A paper loading mechanism for a copier or the like is disclosed. A paper guide member and a foam pressure roller rotatably coupled to a paper drive roller feeds a web of paper to the drive roller, thereby semi-automatically feeding the paper along a predetermined path. A paper canister, having the webs of paper disposed therein, is affixed to a front cover of said paper loading mechanism. This structural arrangement simplifies the procedure of loading paper into the paper loading mechanism of the present invention.

Abstract: A method and apparatus is disclosed for independently displaying one of a plurality of images on a display and for superimposing the plurality of images onto one another to produce a composite image. One or more bit planes are selected to constitute a group (defined to be a "surface"), and one or more additional bit planes are selected to constitute another group. The number of groups corresponds to the number of images to be independently displayed. The priority of one group over the other is selected. This ensures that the image from the one group (surface) appears to be "in front of" the images from the other group (surface) on the display. In the case of a color terminal, the colors associated with each group are selected. A color map memory contains a plurality of brightness indices which determines image brightness. Associated with each index is one or more color indices.