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| Number | Title | Issue Date |
| 4349770 | Electronic damping apparatus Apparatus is disclosed for controlling the movement of a movable element to bring the movable element to rest at a desired stopping position. The apparatus comprises a multi-phase drive motor having a drive shaft coupled to the movable element for driving... | 09/14/1982 |
| 4329634 | Motion sensing apparatus Apparatus is disclosed which is responsive to the movement of a movable element for generating a plurality of electrically phase-displaced signals containing information indicative of the direction, speed and distance of movement of said movable element. ... | 05/11/1982 |
| 4328453 | Motion sensing apparatus Apparatus is disclosed which is responsive to the movement of a movable element for generating a plurality of electrically phase-displaced signals containing information indicative of the direction, speed and distance of movement of the movable element. T... | 05/04/1982 |
| 4328452 | Motion control apparatus Apparatus is disclosed for controlling the movement of a movable element between an initial starting position and a final stopping position. The apparatus comprises drive means coupled to the movable element and responsive to motor drive signals for movin... | 05/04/1982 |
| 4290000 | Power amplifier with current limiter circuit A power amplifier is disclosed for controlling the current flow through a load, such as a d-c servo motor. The amplifier includes a plurality of switching elements connected in bridge fashion with the load and a predetermined power source for coupling the... | 09/15/1981 |
| 4269522 | Bi-directional record material feed apparatus A record material feed apparatus for use with a printing machine of the type including a platen and drive means for rotating the platen about its longitudinal axis. The apparatus comprises a frame capable of being attached to a printing machine adjacent t... | 05/26/1981 |
| 4260936 | Master-slave power amplifiers Apparatus is disclosed for controlling the current flow through first and second loads, such as motors, to thereby control the direction and speed of the motors. The apparatus comprises a first power amplifier connected to the first motor and including an... | 04/07/1981 |
| 4255694 | Power amplifier with power monitor circuit A power amplifier is disclosed for controlling the current flow through a load. The power amplifier includes a plurality of switching elements connected in bridge fashion with the load and a first predetermined power source for coupling the load across al... | 03/10/1981 |
| 4242003 | Multi-pass matrix printing In a printer including a record material movable past a printing station, and a print assembly capable of printing a line of characters in dot matrix format upon relative movement of the print assembly and the record material in a first direction, a metho... | 12/30/1980 |
| 4235360 | Bi-directional pin feed apparatus A pin feed apparatus is provided for a printing machine of the type including a main frame and a printing station. The pin feed apparatus is capable of feeding marginally punched record material past the printing station and includes a shaft rotatably mou... | 11/25/1980 |
| 4214280 | Method and apparatus for recording data without recording on defective areas of a data recording medium A method of transferring data between a data supply and a disk having a track divided into sectors, each sector having an address recording area followed by a data recording area. The method includes detecting a defective area on a data recording area; wr... | 07/22/1980 |
| 4209262 | Print wheel loading apparatus For use in an impact printer having a movable carriage, a motor supported by the carriage and including a rotatable shaft, and a drive coupling member affixed to an end of the shaft, apparatus is provided for loading a print wheel contained in a cartridge... | 06/24/1980 |
| 4208141 | Serial printer with cable tensioning apparatus A serial printer for printing information on a record material is disclosed. The printer includes a frame and a platen mounted on the frame for rotation about its axis, the platen capable of supporting and advancing record material through the printer. A ... | 06/17/1980 |
| 4206859 | Easy-load record material feed apparatus Apparatus for feeding marginally punched record material comprises a main support member, and a plurality of drive pins mounted to the main support member for movement along a predefined path past a first location at which record material is inserted into... | 06/10/1980 |
| 4203154 | Electronic image processing system An electronic image processing system includes a controller for receiving character font data from a main memory and for converting it to image data utilizable by a raster output device capable of formatting the image data in a plurality of scan lines ont... | 05/13/1980 |
| 4203075 | Phase locked loop circuit for video hard copy controller A phase-locked loop circuit includes a voltage controlled oscillator responsive to a control voltage for generating a periodic first output signal comprised of pulses occurring at a first frequency determined by the value of said control voltage. In respo... | 05/13/1980 |
| 4193119 | Apparatus for assisting in the transposition of foreign language text A device is provided for printing a verbal composition in a text form transposed by an operator from the language form in which the source material is presented. Language character forms from different written language formats are encoded and maintained i... | 03/11/1980 |
| 4176379 | Video input circuits for video hard copy controller Video input circuits are disclosed for a video hard copy controller of the type that converts and formats video signals into digital signals for application to a hard copy generating device. The video input circuits comprise a video amplifier circuit havi... | 11/27/1979 |
| 4174039 | Recording disk cartridge A recording disk cartridge comprises a housing in which at least one recording disk may be mounted for rotation about its axis. The housing has a peripheral side wall about which a ridge is formed, the ridge being defined by a plurality of sections at lea... | 11/13/1979 |
| 4165520 | Video hard copy controller A video hard copy controller includes first means for receiving serial input video signals from a first source. Second means is coupled to the first means for converting the serial input video signals into a first set of parallel digital signals. Third me... | 08/21/1979 |
| 4152697 | Parallel run-length decoder System and method for parallel decoding of character data in run length format to produce data in dot matrix form for presentation to a display device. The data for successive runs is stored in registers and processed in parallel to provide address data f... | 05/01/1979 |
| 4149190 | Automatic gain control for video amplifier An automatic gain control circuit for controlling the gain of a video amplifier of the type adapted to amplify a composite video signal comprised of a video data component and a synchronization component. The circuit comprises first means coupled to the o... | 04/10/1979 |
| 4148098 | Data transfer system with disk command verification apparatus A data processing system includes a disk drive, a disk drive controller, a main memory and a CPU. The main memory has disk command data stored therein in a chain of disk command blocks (DCB's). Each DCB contains a first word pointing to the next DCB in th... | 04/03/1979 |
| 4139811 | Method and means for increasing the stiffness of limited frequency servo systems The stiffness of a second-order damped servo system with position and velocity feedback circuits is increased without affecting the command response, damping factor, or natural frequency of the system by adding an acceleration feedback circuit and maintai... | 02/13/1979 |
| 4135217 | Utilization of stored run-out information in a track following servo system A servo system including a recording head to sense servo data on a disk track for fine positoning of the head and an external transducer for generating signals representing the coarse position of the head. A micro-processor stores the coarse positon signa... | 01/16/1979 |
| 4134053 | Method and means for capturing magnetic tracks In a disc drive which does not have a head position sensor but does have a velocity detector and off-track error detection means for sensing the distance and direction of the displacement of the head from the nearest track center, and in which the directi... | 01/09/1979 |
| 4133007 | Video data detect circuits for video hard copy controller Video data detect circuits are provided for a video hard copy controller of the type that converts and formats a video signal into a digital signal for application to a hard copy generating device. The video signal includes a video data component and a sy... | 01/02/1979 |
| 4130844 | Method and means for tracking magnetic tracks In a tracking system using an error signal derived from recorded dipulses of opposing polarity on each side of the center of a data track recorded on a magnetic medium, the need for highly accurate signal integration is avoided by partially integrating th... | 12/19/1978 |
| 4130786 | Apparatus for generating linear and continuous positional error and velocity signals for higher order servo systems A higher order servo system including a phase transducer which produces two triangular waveforms, phase displaced 90° in relation to each other, representing the positions of a movable member, and a commutating circuit, responsive to the triangular wavef... | 12/19/1978 |
| 4111565 | Apparatus for sensing when paper utilized in a printer has been depleted Apparatus adapted for use in printers for indicating when the paper upon which information is to be printed has been depleted. A pivotable sensing member is slightly biased towards a fixed guide member, the two members being adjacent to one another. The s... | 09/05/1978 |
| 4109189 | Phase-sensitive transducer apparatus with improved signal offset means A phase-sensitive transducer apparatus comprises first and second relatively movable members, the first relatively movable member having a plurality of windings and the second relatively movable member having a winding. Means are included for applying a f... | 08/22/1978 |
| 4103766 | Control apparatus for serial printer A serial printer comprises a carriage, a print member rotatably mounted to the carriage and including a plurality of character elements, a first drive coupled to the print member for rotating the print member to a desired rotational position in order to p... | 08/01/1978 |
| 4103338 | Self-diagnostic method and apparatus for disk drive An exerciser is provided for use with a disk drive of the type having a microprocessor, a first memory for storing microcoded control programs for the drive, a second memory for storing instructions for the head carriage servo control apparatus, an addres... | 07/25/1978 |
| 4103331 | Data processing display system A data processing display system comprises a display device capable of displaying a desired image and including a plurality of points each capable of being selectively illuminated. A main memory storage device is also included in the system and comprises ... | 07/25/1978 |
| 4103330 | Task handling in a data processing apparatus A data processing apparatus for processing digital data in accordance with a plurality of predetermined tasks of preassigned priority values and identified by a respective plurality of devices connected to the data processing apparatus. Each device is cap... | 07/25/1978 |
| 4103326 | Time-slicing method and apparatus for disk drive A disk drive includes a first memory for storing microcoded program routines and sub-routines for the drive. One of the routines is a main program routine that is comprised of a plurality of service routines executable in sequence during a respective plur... | 07/25/1978 |
| 4101942 | Track following servo system and track following code A data recording and reproducing system in which a disk having a plurality of data tracks has a track following code stored thereon, enabling a recording head moved by a servo system to be centered in relation to a desired track. The code includes, on one... | 07/18/1978 |
| 4099112 | Method and means for seeking magnetic tracks In connection with a head positioning device for magnetic disc drives in which a low cost implementation for seeks of varying lengths is important and optimum seek time is secondary, a system is disclosed in which head velocity, at least during the final ... | 07/04/1978 |
| 4099024 | Communications network repeater A repeater is provided for use in a communications network which includes a plurality of transceivers, the repeater being bidirectional and allowing the interconnection of two segments of the network and also allowing longer communications networks to be ... | 07/04/1978 |
| 4096579 | Velocity control apparatus for disk drive A velocity control apparatus for a disk drive of the type comprising a recording disk rotatable about its axis, an electromagnetic read/write head for reading data from and writing data onto tracks on a surface of the disk, and means coupled to the head a... | 06/20/1978 |
