Abstract: An absolute resolver position measuring device for a numerical control apparatus that controls a machine having a plurality of movable members. A resolver is operatively connected to each movable member such that the rotor of each resolver rotates as the corresponding member moves. The resolver position measuring device includes a real time counter that provides a multi-digit data word that is cyclically redundant. A first PROM is addressed by the real time counter and provides a sequence of digital data words which represent a sine waveform; and a second PROM is addressed by the real time counter and provides a sequence of digital data words which represent a cosine waveform. A first digital to analog converter is responsive to the first PROM to provide a sine wave to the first stator winding of each resolver, and a second digital to analog converter is responsive to the second PROM to provide a cosine wave to the second stator winding of each resolver.

Abstract: A low cost line printer character chain lubricating device that provides an accurate amount of lubricant between a line printer character chain and the hard, smooth support surface about which the chain rotates. The lubricating device is located in a depression in the hard, smooth support surface and includes a piece of flexible, abrasion-resistant, microporous nitrile rubber that is impregnated with lubricating oil. The nitrile rubber has a smooth convex arcuate surface for contacting the character chain. A bracket semipermanently mounts the nitrile rubber in the depression in the support surface such that the convex arcuate surface of the nitrile rubber contacts the side of the character chain that normally contacts the hard, smooth support surface as the chain rotates. Depressions in the nitrile rubber beside the arcuate surface serve as charging reservoirs for the lubricating oil.

Abstract: A development apparatus for dry toning a latent, electrostatic image on a dielectric surface. The developing apparatus includes a rotating, magnetic brush which picks up dry toner from a reservoir and magnetically carries it past a first region on the dielectric surface to allow it to electrostatically adhere thereto. Residual toner carried past the first region is picked up by an impeller that impels the toner toward a second region on the dielectric surface to simulate cascade toning. Finally, toner that centrifugally escapes the magnetic brush effuses outwardly and is guided toward a third region on the dielectric surface to form a toner cloud.

Abstract: An apparatus and process for detecting overlapped documents in a document processing apparatus by detecting the translucency of the documents. The disclosed apparatus includes a transport path for guiding documents and drive wheels for moving the documents along the transport path. Four LED (light source) phototransistor (light detector) pairs are located across the transport path. One LED-phototransistor pair is used together with electronics to detect when a document is present. Two LED-phototransistor pairs are used together with edge detection electronics to detect sudden significant changes in document translucency from the immediately previous translucency of the same document as the documents pass thereby.

Abstract: An apparatus that provides constant illumination in response to an AC input power source having variable magnitude. The input power passes through a full wave rectifier and is then switched by a solid state switching device having conductive and nonconductive states to a passive L-C filter. The output of the filter energizes one or more lamps to provide the illumination. A phase control circuit is responsive to a sync signal from the full wave rectifier and a feedback signal from the output of the filter and controls the phase angle conduction time of the solid state switching device at a repetition rate related to the frequency of the AC input power to provide constant illumination from the lamp.

Abstract: An apparatus and process for detecting document jams in a document processing apparatus by detecting the translucency of the documents. The disclosed apparatus includes a transport path for guiding documents and drive wheels for moving the documents along the transport path. An LED light source located on one side of the transport path illuminates at least a portion of the moving document as it passes along the transport path. A phototransistor light detector located on the other side of the transport path detects light from the LED that passes through translucent portions of the document. Electronics connected to the light detector indicate a document jam when the translucency of a document is generally unchanged for a period of time while the document is between the light source and light detector.

Abstract: A computer terminal for providing a visual display of linguistic characters in response to character data information from an external computer. The computer display terminal can be semipermanently configured in response to externally supplied configuration information. The terminal includes a microprocessor unit formed by a microprocessor, a ROM for instruction codes and a RAM for temporary data storage. A data communications channel interfaces with the microprocessor unit, receives the character information from the external computer, and provides such information to the microprocessing unit for storage in its RAM. A CRT or other display interfaces with the microprocessor unit and visually displays character information stored in the RAM. A keyboard or other input interfaces with the microprocessor unit and provides a means for inputting externally supplied terminal configuration information.

Abstract: A self locking door opening device and assembly are provided, the door having an aperture extending therethrough. The assembly includes a grip and a retainer latch. The grip includes a pair of side walls and a base member from which the side walls extend. A top wall interconnects the side walls. The retainer latch comprises a flexible elongated clip having a pair of ends and a central portion. The grip is secured in a locked position by the clip when the clip is disposed in a longitudinal passage defined by the side walls and the top wall. In this locked position the periphery of the door about the aperture is disposed between the ends of the clip and the base member while the central portion of the clip flexes to abuttingly engage the top wall. A pair of projections extend from the top surface of the clip. The top wall of the grip is disposed between the projections and abuttingly engages the projections and the central portion to secure the grip in the locked position.

Abstract: A document sorting system includes a concatenation of document receiving modules, each module having a plurality of pockets and being distinguishable from another module only by its position in the concatenation. A coding circuit is included in each module to generate a unique identifying code for each of the plurality of pockets in the module. The identifying code has a first binary portion based on the position of the module in the concatenation, and a second portion based on the position of the pocket in the module.

Abstract: A keyboard switch is actuated by the depression of a magnetized plunger into the region of a magnetic sensing device positioned at the lower extreme of plunger travel. The plunger is integrally formed of a plastic, magnetizable material and has a central, longitudinal opening that receives and registers with the sensor. The change in magnetic field intensity associated with plunger travel is detected by the sensor and translated into a signal representative of switch actuation.

Abstract: A document processing apparatus that detects magnetic characters on documents as they pass therethrough. The apparatus includes a transport path, pairs of wheels for driving the documents through the apparatus, a DC magnetic writing device and a magnetic reading device. The DC magnetic writing device orientates the magnetic dipoles of the characters on the documents; and the reading device detects the orientated dipoles of the characters. The writing device precedes the reading device and is provided by two magnets, one of which is located on each side of the transport path, with the magnets having like magnetic poles facing toward each other.

Abstract: A high-speed apparatus that processes a stack of documents such as bank checks. The apparatus includes a feeder for serially feeding the documents, an error-indicating character reader for reading characters on the documents, an operator's console for manually inputting characters rejected by the character reader, and a sorter for sorting the documents into groups. The error-indicating character reader includes a character reader, a printer located a fixed distance from the character reader and an AC synchronous motor that drives each document serially past the reader and printer in a continuous motion. The character reader provides a first electrical signal when it cannot read a character. A motor velocity detecting means provides a second electrical signal representative of the motor velocity.