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| Number | Title | Issue Date |
| 6682233 | Supporting structure of an armature of a wire dot printer head In a wire dot printer head of the present invention, an armature is formed by coupling a magnetic circuit formation member having a supported piece with one end inserted into a cavity formed on a surface of a yoke to an arm coupled to a wire. The supporte... | 01/27/2004 |
| 6254291 | Dot-impact printing head control apparatus A printing head control apparatus 10 is used for a dot-impact printer in which a dot is formed on a paper set on a platen via an ink ribbon 16 with an impact force applied by a pin 18. The printing head control apparatus 10 comprises: a dot classifier for... | 07/03/2001 |
| 5743665 | Printer integrated driver and hammerbank A printer with a reciprocally moving hammerbank with a plurality of hammers thereon is disclosed including a magnet for retaining hammers on the hammerbank of the printer from a firing position. A coil overcomes the magnetism of the magnet by a circuit fo... | 04/28/1998 |
| 5720561 | Printer coil temperature sensor and method A line printer having a hammerbank with hammers that are held by a permanent magnet and released by electrically driven coils. The temperature of the coils is determined by the relative resistance of the coils to provide an output equivalent to the temper... | 02/24/1998 |
| 5518326 | Impact printer which can detect partial defects in coils An impact printer which can detect halfway defects of printing coils such as partial short circuits is disclosed. The impact printer according to the present invention includes at least one printing coil for driving a printing element and driving transist... | 05/21/1996 |
| 5518327 | Wire motion detecting apparatus for wire dot head and wire dot impact printer apparatus therewith The wire motion detecting apparatus according to the present invention comprises a velocity detecting portion for detecting the velocity of a printing wire, a comparator output signal generating portion for generating a first comparator output signal CMP ... | 05/21/1996 |
| 5474393 | Compact remote-driven encoder A remote-driven encoder which includes a feed tray assembly (12) and an autofeed roller assembly (14) which moves checks one at a time into a check guide path. The check is moved along the check guide path by first and second drive assemblies (16, 20). In... | 12/12/1995 |
| 5452958 | Drive coil protection apparatus and method and printer incorporating the apparatus The invention provides an drive coil protection apparatus and method and a printer incorporating the apparatus. A rank memory stores a preset rank value associated with a reference drive coil in the print head of a printer. The preset rank value character... | 09/26/1995 |
| 5413423 | Print element drive control with constant current charge and discharge of capacitor A dot matrix printer having a print head having a plurality of print solenoids. The print head is carried on a print head carriage driven by a carriage drive arrangement. A print timing means supplies a sequence of print timing pulses as said print head t... | 05/09/1995 |
| 5372437 | Print head of wire-dot printer and production method thereof A print head of a wire-dot printer and a production method thereof, in which superhard chips are attached to contact surfaces of an armature and a core by brazing. The superhard chips can be readily secured to the contact surfaces of the armature and the ... | 12/13/1994 |
| 5320435 | Direct solenoid drive imprinting mechanism An apparatus for embossing sheet material by applying pressure to punch and die members positioned on both sides of the sheet material using force developed by one or more solenoids to force the punch and die members together to apply an imprinting force.... | 06/14/1994 |
| 5312195 | Electromagnetic drive mechanism for the printing pin of a print head An electromagnetic driving device for driving a print needle of a printer employing an E-shaped magnetic yoke. In order to improve print speed, the armature and arms of the yoke are specifically dimensioned. The precise lengths and widths of the armature ... | 05/17/1994 |
| 5290112 | Matrix print head, in particular serial matrix pin print head A matrix pin print head with a print pin guide casing (7) and a print pin drive casing (9) comprises an electromagnetic drive (12). The electromagnetic drive (12) comprises a magnet yoke (13) with an electromagnetic coil (14) disposed on a magnet yoke arm... | 03/01/1994 |
| 5269611 | Hammer driving mechanism for printing apparatus A hammer driving mechanism in a printing is arranged to prevent double striking during erasing operations. A controller is provided to control the hammer drive means or a stopper based upon whether an erase command or a print command is received.... | 12/14/1993 |
| 5228386 | Print hammer assembly for dot line printer In a print hammer assembly for a dot line printer, print pins are attached to the tip ends of print hammers alternately displaced toward left and right by a predetermined distance from a vertical center of the print hammer, wherein comb portions of a fron... | 07/20/1993 |
| 5221149 | Type printer A type printer has at least two colors of ink applied alternately in a column direction and is shifted in the column direction for each rotation of the type drum. The type drum is automatically halted once the drum has completed two revolutions. A selecti... | 06/22/1993 |
| 5214558 | Chopper drive control circuit A coil is connected to a voltage source by a switch enabled by a drive signal of fixed duration. Drive current in a coil is terminated by a chopper circuit if it reaches a predetermined peak level before the end of preselected rise time interval. The chop... | 05/25/1993 |
| 5192148 | Dot line printer having improved comb yoke A hammer bank assembly including a hammer base, a plurality of leaf spring type printing hammers, permanent magnets, a comb yoke and electromagnetic coils. The comb yoke has a base portion positioned on the permanent magnets and police portions secured by... | 03/09/1993 |
| 5190383 | Dot printing apparatus A dot printing apparatus in which the piezoelectric print head having the piezoelectric element connected to the printing wire is utilized and the secondary bounce of the printing wire is effectively controlled according to one of three dot printing modes... | 03/02/1993 |
| 5188467 | Print head with energizing and return leaf springs A print head is provided with armatures, each having a stylus section and a plunger in an opposite position, the armatures each having the middle section that serves as a fulcrum for rotation. A plurality of first flat springs act on the armatures to that... | 02/23/1993 |
| 5183344 | Quiet impact printer mechanism An improved quiet impact printer mechanism for use with a typewriter or printer which includes a print hammer having a high effective mass at the print point for impacting a character pad against an ink ribbon, paper and a platen at a relatively low veloc... | 02/02/1993 |
| 5180235 | Impact printer with variable impact and rebound control An impact printer has a platen, a carriage movable in parallelism to the platen, a hammer carried on the carriage, driving means for protruding the hammer toward the platen, detecting means for detecting the speed of the hammer striking against the platen... | 01/19/1993 |
| 5165807 | Printing head having a distortion element Front ends of the frames of a plurality of print units can be supported by a support member. At the rear end of each frame a fitting member having screw holes is attached. A fixing member is provided on the back side of the fitting members. Screws are ins... | 11/24/1992 |
| 5163762 | Driving circuit for solenoid head of a printer In a printing head, which is employable in a printer, having a predetermined number of printing pins respectively connected to solenoids circularly disposed along a predetermined circle, the solenoids being arranged to be connected to another predetermine... | 11/17/1992 |
| 5152217 | Printer having improved hammerbank airflow An improved hammerbank in a dot matrix line printer has two different sets of staggered apertures therein along the length thereof for drawing pressurized air at the outside of the hammerbank therein to provide turbulent, high velocity cooling air in the ... | 10/06/1992 |
| 5149214 | Print wire driving apparatus A print wire driving apparatus for use in a printer having a stabilized power source, a print wire, an urging coil for driving said print wire and a power source including a smoothing capacitor for energizing the urging coil is provided. An accumulating c... | 09/22/1992 |
| 5133613 | Printing head using staggered arrangement needles A printing head includes solenoids arranged in an annular array for driving needles which are arranged in a zigzag array of two vertical columns. Solenoids corresponding to needles forming one of the columns are arranged on a semicircle of the annular arr... | 07/28/1992 |
| 5120142 | Solenoid controlling apparatus In a printing device employing a solenoid for driving a printing hammer, provided are switching member for ON/OFF operating electric current flowing through the solenoid coil, voltage generating member for generating voltage in accordance with the electri... | 06/09/1992 |
| 5104246 | Striker device for printers A striker device for use in printers comprises a platen roller, a character-carrying disc and a print hammer for striking a character of the disc against the roller. The print hammer is actuated by an armature which is movable in an impact direction by vi... | 04/14/1992 |
| 5099383 | Print head activating circuit for a wire dot printer A print head activation circuit for a wire dot printer includes a first switch and a second switch. A CPU produces a printing timing control signal. A first driving signal-generating circuit produces a first driving signal pulse having a pulse width T | 03/24/1992 |
| 5088845 | Ribbon cassette for mechanically unlocking a printing mechanism upon insertion of the ribbon cassette into a printing device A ribbon cassette is selectively mounted in a printing device having an operating mechanism actuable between locked and released states. The ribbon cassette has a casing for accommodating therein a print ribbon that cooperates with the operating mechanism... | 02/18/1992 |
| 5071267 | Actuation magnet for a printing stylus of a matrix printer The invention relates to an actuation magnet for a printing stylus (11) of a matrix printer, in which an armature (12) of the plunger type connected to the printing stylus (11) is guided in the cylindrical inner space of two soft-magnetic pole pieces (6,7... | 12/10/1991 |
| 5066980 | Solenoid plunger magnet and its use as print hammer in a print hammer device A solenoid plunger magnet system is disclosed, preferably to be used as print hammer in a print hammer device. Known solenoid plunger magnets have in the exciting coil a first interferric gap as working interferric gap and a second interferric gap outside... | 11/19/1991 |
| 5046413 | Method and apparatus for band printing with automatic home compensation A system and method for automatically compensating for inaccuracies in the positioning of the timing mark sensor of a band line printer. A selected hammer is operated to impact a test character and an adjacent space between characters or a space provided ... | 09/10/1991 |
| 5046871 | Actuator for print hammer An actuator for actuating a print hammner includes a yoke made of a magnetic material, an electromagnetic coil mounted on the yoke, and an armature rotatably supported by bearings mounted on opposite sides of the yoke. Upon excitation of the electromagnet... | 09/10/1991 |
| 5042376 | Aerodynamic damper for an impact printing actuator Aerodynamic damper for impact printing actuator in which a movable armature of a magnetic circuit has to resume, after actuation, with minimum rebounding and oscillations, a stable rest position defined by the contact of a flat surface of the armature wit... | 08/27/1991 |
| 5032031 | Drive circuit for a matrix printer A drive system for printers, in particular for matrix printers of a needle-type construction or hammer-type construction, exhibits an electromagnetic coil (L) coordinated to each printing element (6), as well as a magnetizable armature disposed opposite t... | 07/16/1991 |
| 5030020 | Wire-dot impact printer having means for detecting displacement of individual print wires A wire-dot impact printer includes a wire-dot print head having a plurality of print wires disposed therein. Each of the plurality of print wires has a distal end, and each is displaced in response to a drive signal so as to strike a printing medium with ... | 07/09/1991 |
| 4995744 | Impact printer actuator using magnet and electromagnetic coil and method of manufacture A print actuator for a dot matrix printer has a stator with a frame, at least two ferromagnetic poles and at least one permanent magnet; and at least one electromagnetic coil surrounding the magnet. The magnet can generally hold an armature in a home posi... | 02/26/1991 |
| 4976553 | Very small displacement enlargement mechanism and printing head using the same A very small displacement enlargement mechanism is disclosed, in which a first stationary frame and a second movable frame are disposed on the opposite sides of a piezoelectric element for producing a strain in a longitudinal direction according to an app... | 12/11/1990 |
