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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7246960 | Print head A needle guide (5) is composed of a first guide wall (5a) and a second guide wall (5b) arranged at a distance x from each other. Each of these guide walls is formed with through holes through which needles penetrate and which exten... | 07/24/2007 |
| 7172351 | Method for manufacturing an armature An armature manufacturing method of forming an armature including an arm holding a printing wire, and magnetic circuit forming members attached to the arm places the magnetic circuit forming members on the arm with a resistive layer of a resistive material having hi... | 02/06/2007 |
| 7048455 | Wire dot printer head with abrasion having magnetic permeability and hardness surface In order to realize a stable rocking operation of the armature for performing high-speed printing, between the armature spacer for accommodating and holding the support shaft of the armature which supports the printing wires, and the yoke for holding the support sha... | 05/23/2006 |
| 6994482 | Wire dot printer head and wire dot printer In order to restrain a flux loss for obtaining magnetic characteristic required for high-speed printing, a wire dot printer head has armature 4 having a pivot shaft serving as a center of a pivot and pivotably provided so as to oppose to plural cores formed o... | 02/07/2006 |
| 6821035 | Line printer with staggered magnetics An impact printer with a hammerbank having print hammers retained by a permanent magnet for impacting a print ribbon, and a mechanical driver for moving the hammerbank across print media. First and second coils for each hammer are wrapped around first and second pol... | 11/23/2004 |
| 6779935 | Printer hammerbank with a magnetic shunt An impact line printer comprising a print ribbon wound on a pair of spools for traversal in two directions across a plurality of print hammers having tips for impacting the print ribbon to print on a media. A permanent magnet having two pole pieces having pole piece... | 08/24/2004 |
| 6609845 | Printing apparatus and image data processing method therefor A printing apparatus, which performs printing by using a full-line type printhead, prints an image in accordance with an attachment angle of the printhead, and automatically performs registration adjustment when using plural printheads. In the apparatus, ... | 08/26/2003 |
| 6000330 | Line printer with reduced magnetic permeance An impact printer and method of printing having a plurality of hammers in side-by-side relationship with pairs of pole pieces in associated relationship with each hammer with a hammer contact end and a distal end removed from the hammer contact. A pair of... | 12/14/1999 |
| 5651621 | Wire dot print head with print wires fixed to tip portions of armatures differentiated in resiliency Resiliency of a flat spring 7 corresponding to an end print wire 12 is set to be greater than that corresponding to a central print wire 12 by varying width of an effective spring portion 7b of a flat spring piece 7A to which an armature 13 is attached de... | 07/29/1997 |
| 5344242 | Printer hammerbank with low reluctance magnetics The specification describes a low reluctance magnetic circuit for a dot matrix line printer for retaining hammersprings by the magnetic circuit having pairs of pole pieces formed of magnetically conductive sheets having a space for receipt of a permanent ... | 09/06/1994 |
| 5219235 | Dot line printer having improved yoke assembly A printing hammer assembly is provided having a plurality of hammer springs arrayed side by side at a predetermined pitch in a shuttling direction of a hammer bank. A front yoke is provided in front of the hammer springs, and a plurality of rectangular gr... | 06/15/1993 |
| 5088844 | Impact dot print head and printer including same A printer including an impact dot print head for driving a plurality of print wires mounted on the cantilevered end of print levers is provided. The print head includes a stopper positioned to be impacted by a print lever returning from a print position t... | 02/18/1992 |
| 5073051 | Matrix pin print head having a shield to counter magnetic fields A matrix pin print head, particularly of the biased construction, includes a base plate (1) made of a soft-magnetic material, an annular permanent magnet (2), a distance spacer ring (3), a spring (4) tensioned in each case radially outwardly, where an arm... | 12/17/1991 |
| 5040909 | Impact dot printer having a ring-shaped magnetic bypass means An impact dot print head for driving a printing wire is provided. An armature has a printing wire mounted at one end and is attached to a leaf spring at its other end. A ring-shaped primary magnet provides a magnetic force for maintaining the armature in ... | 08/20/1991 |
| 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 |
| 4944615 | Permanent magnet print head assembly with a square magnet A print head assembly of a printing device, in which a supporting member, supporting a plurality of armatures, and a permanent magnet member, urging the armatures in one direction by means of its magnetic force, are arranged between a head body, as a yoke... | 07/31/1990 |
| 4934848 | Printer head with adjustable magnetic reluctance A printer head comprising a plurality of driving arms provided corresponding to a like plurality of printing elements and a like plurality of electromagnetic driving devices for driving the corresponding driving arms independently. Each of the electromagn... | 06/19/1990 |
| 4929101 | Release-type dot print head A release type dot print head employing cores formed of a difficult-to-machine magnetic alloy containing iron and cobalt as the principal components and having a high saturation magnetic flux density. The cores are fabricated easily by processing plates o... | 05/29/1990 |
| 4921364 | Dot matrix print head having easily removable magnets A printing head for a dot matrix printer is disclosed which facilitates assembly and disassembly and improves printing quality. The printing head has a plurality of hammers carrying respective printing wires, a plurality of coils each of which corresponds to e... | 05/01/1990 |
| 4913569 | Wire-type printing head A wire-type print head comprises an armature to which a rear end of a printing wire is fixed, a core having its forward end adjacent to a rear surface of the armature, a leaf spring having a first end fixed near a permanent magnet and a second end fixed t... | 04/03/1990 |
| 4895463 | Matrix print head A matrix print head is provided with electromagnetic circuits coordinated to individual dot-print elements (10), where the dot-print elements (10) are attached in each case to spring armatures (11). The armatures are in each case disposed opposite to a co... | 01/23/1990 |
| 4879947 | Printhead which minimizes stray magnetic flux A dot matrix type printer head in which delays in the release of print hammers are eliminated by providing release coils only in alternate hammer positions, or alternatively, activating at one time only release coils in one of even-numbered and odd-number... | 11/14/1989 |
| 4844634 | Printing head for an impact printer A spring-charge type printing head has an elongatable support including a piezoelectric element provided between an attracting permanent magnet and a hammer-fixing portion. Accordingly, the printing head can be operated at a high speed and require less po... | 07/04/1989 |
| 4822188 | Printing mechanism There is disclosed an improvement upon a cancellation type printing mechanism or a stored energy type printing mechanism having magnetic members, so-called armatures, attracted by a permanent magnet while resiliently deflecting resilient members connected... | 04/18/1989 |
| 4802776 | Print head having a wear resistant rotational fulcrum A print head having magnetic members attracted by a permanent magnet while resiliently deflecting resilient members connected to one ends thereof associated with corresponding solenoids adapted to selectively release the associated magnetic members by can... | 02/07/1989 |
| 4749290 | Core structure for electromagnetic print head In a print head comprising a plurality of magnetic circuits each of which comprises an armature supported by a spring, a permanent magnet for biasing the armature in one direction, and an electromagnet which can be energized so as to cancel the biasing fo... | 06/07/1988 |
| 4695174 | Magnetic circuit for matrix print head A matrix print head includes a magnetic yoke plate, magnetic pole defining cores annularly arranged on the yoke plate, electromagnetic coils mounted on the cores, a permanent magnet plate arranged in magnetic conductive relationship to the yoke plate; the... | 09/22/1987 |
| 4674896 | Printing mechanism for an impact matrix printer A printing mechanism has a cantilevered leaf spring of magnetic material and an electromagnet. A cantilevered first thin plate of magnetic material is disposed between the leaf spring and a core of the electromagnet. A second thin plate of nonmagnetic mat... | 06/23/1987 |
| 4600323 | Printing head assembly A printing head assembly having a permanent magnet to attract magnetic members such as armatures to store the strain energy in resilient members such as leaf springs, electro-magnets to cancel the magnetic flux generated by the permanent magnets in order ... | 07/15/1986 |
| 4591280 | Permanent magnet, stored energy, print head A print head for a dot matrix serial printer, including a high energy permanent magnet (13) surrounded by a plurality of coil/post combinations (15, 17) each aligned with a print hammer (23), is disclosed. The high energy permanent magnet (13) is centrall... | 05/27/1986 |
| 4584937 | Long release coil hammer actuating mechanism An actuating mechanism includes a magnetic circuit formed by a permanent magnet (43), a flux plate (45), a return plate (47), a post (49), and a long release coil (51). The outer end of the release coil (51) terminates slightly short of the tip of the pos... | 04/29/1986 |
| 4582437 | Print pin actuator and method of making same The high speed print pin actuator disclosed herein is constructed as two sub-assemblies, a U-shaped fixed magnet structure and an armature sub-assembly. One leg of the U-shaped structure constitutes a coil core and the other includes a permanent magnet an... | 04/15/1986 |
| 4575268 | Dot matrix printer head A dot matrix printer head in which movement of a plurality of printing wires is effected by an equal member of circumferentially spaced armatures and the head employs permanent magnet and electromagnetic members for controlling movement of the individual ... | 03/11/1986 |
| 4572681 | Wire dot print head The printing head for a wire-type dot printer includes a plurality of electromagnetic coils, a wire, a permanent magnet, and a leaf spring. The arrangement of the wire and the leaf spring allows the print head to operate stably during high-speed operation... | 02/25/1986 |
| 4552471 | Print head with permanent magnetic bias A print head includes a coil carrier having upwardly bent legs serving as yokes and being arranged around or upon a permanent magnet whose outer face is coplanar with the end faces of the yokes; a cover plate is mounted on and in that plane having apertur... | 11/12/1985 |
| 4543884 | Shuttle type line printer The present invention relates to a shuttle type line printer which is characterized in that among members constituting printing elements of the shuttle type line printer, such as a permanent magnet, an electromagnet, a yoke and a printing hammer, the perm... | 10/01/1985 |
| 4539905 | Dot matrix line printer and print element driver assembly therefor A dot matrix line printer incorporates plural print element driver assemblies each including N electromagnets driving N print rods, with each electromagnet having a local magnetic circuit that includes a working air gap and a passive air gap; a permanent ... | 09/10/1985 |
| 4537520 | Dot printer head with reduced magnetic interference The present invention provides a dot printer head which includes a plurality of cores each having a mounting portion which is contacted with a core holding face of a permanent magnet and a post-like projection for mounting an electromagnetic coil thereon.... | 08/27/1985 |
| 4521122 | Needle printer assembly A needle printing device having a plurality of printing needles mounted in electromagnets with a permanent magnet operating through a yoke to retain a spring upon which the needles are mounted against the core of the electromagnet, the spring having an ar... | 06/04/1985 |
| 4513496 | Method of making a print pin actuator The high speed print pin actuator disclosed herein is constructed as two sub-assemblies, a U-shaped fixed magnet structure and an armature sub-assembly. One leg of the U-shaped structure constitutes a coil core and the other includes a permanent magnet an... | 04/30/1985 |
