Abstract: A mode suppressor for use with circular waveguides which are over-sized to provide a low-loss transmission path for signals in the TE.sub.11 mode and which carry an electric field which is perpendicular to the longitudinal axis of the waveguide. The mode suppressor includes resistance cards located in planes which are generally parallel to the longitudinal axis of the circular waveguide and generally perpendicular to the electric field of the TE.sub.11 mode. Resistance cards are also contained in secondary waveguides which are coupled to the sidewalls of the circular waveguide. The resistance cards in the secondary waveguide lie in a plane parallel to the TE.sub.11 electric field and perpendicular to the longitudinal axis of the circular waveguide. The TM and TE.sub.on modes (where n is an integer of 1 or greater) are suppressed by the resistance cards lying parallel to the longitudinal axis. The TE.sub.21 and TE.sub.31 modes are suppressed by the resistance cards contained in the secondary waveguides.

Abstract: A toner mechanism is shown which utilizes a paper roller to pass a sheet of paper between the roller and a toner brush where toner is applied to the surface of the paper and attracted to electrostatically charged portions on the surface thereof. The toner is retained within a reservoir whose opening is filled by the brush. The paper roller, located adjacent to the brush, draws the paper between the brush and roller. Rotation of the brush causes the toner to pass out of the opening within the reservoir while movement of the paper and roller tends to push the toner back into the reservoir through the opening. The ratio of rotational rates between the brush and paper roller and the size of the reservoir opening establish a meniscus of toner which is in equilibrium and thus self-regulating.

Abstract: A calculator having a keyboard alterable by interchanging various keyboard modules is provided by an arrangement wherein a module is insertable into a floating connector which adjusts the space allowed for the module to the size of the module and which provides reliable electrical connection to a main keyboard. Each module is insertable and removable with one hand by providing a resilient camming member attached to the calculator, which mechanically interacts with a locking and releasing member which is connected to the module and is accessible when the calculator is resting on a desk.

Abstract: An electronic calculator utilizing a programmable read-only memory (PROM) cartridge for control of a number of the calculator functions is provided with a bezel which is snap-fit into a keyed opening in the calculator housing and guides a connector on the cartridge into simple and reliable electrical connection with a connector in the calculator. The bezel, which is simply and inexpensively constructed of plastic, has at least one bevelled outer surface to insure proper orientation of the bezel in the keyed opening and has at least one bevelled inner surface which cooperates with a corresponding bevelled outer surface on the cartridge to prevent improper orientation on the cartridge during insertion thereof into the bezel. The cartridge cover is also simply and inexpensively constructed of plastic, has self-aligning parts, and may be assembled by using a single screw.

Abstract: An acousto-optic modulator beam switching device for use in recording and display systems comprises a source of collimated light; an acousto-optic modulator; said source being capable of being beamed at said modulator; a radio-frequency oscillator capable of providing outputs at a plurality of frequencies; and a switching device coupled to said modulator and to said oscillator means; said switching device allowing each of said plurality of frequencies to be coupled to said modulator in succession, according to a predetermined sequence; the application to the modulator of each of said frequencies causing a corresponding deflection in the angle of the beam exiting from said modulator; said deflected beam having a predetermined power versus time characteristic; said predetermined sequence allowing a first frequency to be coupled to said modulator followed by a second frequency being coupled to said modulator at a time before the deflected beam exiting from said modulator, as a consequence of the application of s

Abstract: In a matrix printing head (1) including at least one printing needle (9), an electromagnet (2), which is provided with an armature (4) co-operating with the printing needle for moving the latter towards a printing position, and a spring (6) for returning the needle in a direction from the printing position, the printing needle is pivotably and detachably connected to the armature (4) by means of said spring (6). The pivotable connection is accomplished by the printing needle (9) being provided with a curved end (9b) pivotably supported in a groove (4c) in the armature (4). The curved end of the needle is retained in this groove by means of said spring (6). The armature (4) is pivotably supported in a notch (5b) in a yoke (5) carrying a plurality of electromagnets (2) and is detachably supported in the notch by means of said spring (6).

Abstract: A toner container is shown which includes a toner brush that moves toner to a rectangular opening partially closed by flexible triangular masks for restricting the flow of toner into contact with a sheet of paper to cause the toner to diverge as it flows across the paper thus preventing the toner from passing under the edge of the paper. The toner brush is rotatably mounted in the rectangular opening within a nonmagnetic cylinder which may be intermittently rotated. A scraper mounts against the nonmagnetic cylinder for removing accumulated toner therefrom during the intermittent rotation. As the toner moves around the cylindrical shell, under the urging of the toner brush, it is passed through a portion of the container that is laterally constricted to urge the toner into a narrow configuration in preparation for presentation to the masked opening.

Abstract: A start of message generator for a facsimile system for selecting a specific mode of operation from any of a plurality of available modes, each of the modes having a discrete code, apparatus for encoding the selected mode with its respective code, a synchronizing word generator for generating a start of message (SOM) synchronizing word (SYNC), a clock generator for generating a selected number of clocks corresponding to the encoded selected mode, a sequencer including apparatus for enabling the synchronizing word generator for a predetermined number of clocks whereby a SOM SYNC is generated, apparatus for enabling the clock generator immediately after the SOM SYNC has been generated, whereby the selected number of clocks will be generated by the clock generator, apparatus for enabling ythe synchronizing word generator immediately after the selected number of clocks has been generated by the clock generator for a predetermined number of clocks whereby a second SOM SYNC is generated and a start of message decod

Abstract: An electronic line printer characterized by reduced electromagnetic interference, comprising a printer chassis including record medium storage means; a platen mounted on said chassis and adapted to be in contact with the record medium; electronic printing means for contacting said record medium for printing visible symbols on said record medium; and record medium tensioning means for increasing the tension of said record medium in the vicinity of said platen.

Abstract: In an optical scanning system the position of a scanning beam is determined by a grating across which the beam is traced and then retraced to start again. The first grate is detected by first filtering the relatively low frequency input signals generated as the beam traces across the grating and the relatively high frequency signals generated as the beam retraces across the grating. The filter passes the low frequency signals, excludes the high frequency signals and accentuates the changes between high and low frequency signals which occur as the beam reaches either end of the grating. By applying the filtered signal to a gating arrangement, it is possible to eliminate one plurality of the signals generated as the beam falls upon the end of the grating. The remaining plurality of signals is further applied to a gate which detects the first grate signal to the exclusion of all others for providing an accurate indication of the start of scan of the optical system.

Abstract: An acoustical noise attenuating platen for an impact printer including lead material fastened with a thermoplastic compound to the rear surface of a non-rotatable bar.

Abstract: A furniture joint construction including a generally box-like brace member, the various walls of which are secured to respective different furniture members.

Abstract: A business form, which may be a tag, label, ticket, identification card, or the like, comprising a base sheet adapted to receive writing or printing and a transparent sheet having adhesive by which it can be laminated to the base sheet, and a liner sheet covering the adhesive. A removable carbon paper or other sheet lying between the liner and base sheets is secured to the former whereby removal of the carbon sheet automatically causes the liner sheet to be pulled off and removed and the transparent sheet to be applied to the face of the base sheet.

Abstract: An apparatus and method for making single crystals of a high melting point substance by a crucibleless skull process are provided wherein the apparatus operates with less power consumption than comparable prior art systems. The apparatus utilizes a self-sealing and self-venting charge comprising a mass of the substance with a preformed vent therein, the mass being held and retained by a side wall made of a felt of the substance. The charge is retained by an encircling plurality of rods comprising a nonsusceptible material. The charge is heated by RF induction from the center of the charge to form a melt which extends outward. The melt is extended longitudinally by translating the charge in the RF field.

Abstract: A ribbon cartridge for use in combination with a printing machine having a ribbon quantity sensor for reversing the direction of ribbon movement is provided. The cartridge has at least two spools therein with an inked ribbon attached to each spool and includes means for immobilizing both of the spools and means for locking each of the spools in a preferred position for insertion into the printing machine.

Abstract: A batch reading system for automatically reading documents such as tags or tickets having data marked thereon in the form of human readable characters which are also automatically readable by suitable apparatus, the system being capable of feeding documents which are curled, wrinkled, bent, and otherwise deformed or mutilated. The documents are fed from an input hopper by first feed means, which may be a vacuum belt, from which they are fed to a second vacuum belt on whose underside the tags are held and fed past an underlying automatic reading device. The documents which are properly read are each stripped from the overlying vacuum belt by a flipper arm into a discharge chute, while other tickets are fed past the discharge chute to a reject stacker. To accurately laterally position the documents being fed, one of their longitudinal edges is pressed against a reference surface.