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| Number | Title | Issue Date |
| 5054942 | Wire printing head with unitary return group A needle or wire printing head comprises a plurality of electromagnets with fixed cores, each with two limbs, which are mounted in a ring within a containment body. Movable armatures are disposed in a radiating array in front of coplanar terminal surfaces... | 10/08/1991 |
| 5039236 | Print head with tapered conical return spring A dot matrix print head has a print wire unit having a plurality of print wires, an armature unit having a plurality of armatures, each corresponding to the print wire, and an electromagnet unit having electromagnets. Each wire comprises a wire body and a... | 08/13/1991 |
| 4882987 | Attaching device in a spring-charged dot printer A retaining plate for use in a spring-charged dot impact printing head has a leaf spring confronting surface which mates with the inclined surface of a support, so that mounting members which fix the leaf springs to the support are substantially parallel ... | 11/28/1989 |
| 4867059 | Impact printer print mechanism and method of manufacture Electromagnets and spring-damper units respectively impart forward movement and rearward movement to slider members having hammer faces at their forward ends and armatures intermediate their lengths. The electromagnets and spring-damper units are mounted ... | 09/19/1989 |
| 4817522 | Printer device A printer device having a hammer mechanism for printingly impacting a type drum by means of hammer springs. Hammers are rotatably controlled to retracted positions where the hammers are not brought into contact with a reset cam in each printing cycle, so ... | 04/04/1989 |
| 4699051 | Cooling assembly for hammer bank A cooling apparatus for a hammer bank assembly of an impact printer. The cooling apparatus directs air onto each hammer and magnet of the hammer bank assembly and maintains the temperature differential of the hammers and magnets within predetermined range... | 10/13/1987 |
| 4602561 | Driving mechanism for a type drum in a printer An impact printer has a type drum, a plurality of hammers, a type drum gear secured to a shaft of the type drum, and a gear train including a drive gear and an intermediate gear engaged with the drive gear and type drum gear for driving the type drum. A l... | 07/29/1986 |
| 4595304 | Hammer assembly for printers A plunger type electromagnetic hammer assembly for use with a printer including a hammer housing having a magnetic flux emitting surface. The hammer assembly includes a hammer slidably situated in the housing wherein the hammer includes a plunger portion ... | 06/17/1986 |
| 4557192 | Self restoring pivoting means and print hammer using same A pivoting means for pivoting back and forth a mechanical load such as a print hammer about a given axis and within a low amplitude angle includes two elongated leaf springs. The leaf springs are located in planes at a given angle with respect to each oth... | 12/10/1985 |
| 4557193 | Printing device In a printing device for printers or typewriters a hammer (11) is axially movable between a print position and a rest position. At one end the hammer has an impact surface (12) which acts upon a selected one of a number of type characters disposed along t... | 12/10/1985 |
| 4490057 | Print wire solenoid A matrix print wire solenoid used in a wire matrix printer and including an enclosure member releasably secured to one end of the solenoid by a spring member deformed by the outer surface of the enclosure member to pre-load the enclosure member and an ene... | 12/25/1984 |
| 4472072 | Printing apparatus A printing apparatus having a plurality of printing wires or hammers. The printing apparatus has a main drive driven continuously at a resonance frequency so as to supply energy to the plurality of printing wires or hammers, a plurality of selective drive... | 09/18/1984 |
| 4454809 | Print hammer mechanism A print hammer mechanism 10 includes a plurality of parallel print hammers positioned for sliding movement within slots 20a-i, 22a-i in the walls 16, 18 of a frame 12. The selective energization of one of a plurality of magnets 61a-i draws the correspondi... | 06/19/1984 |
| 4429342 | Impact printing device with an improved print hammer An impact printing device having a plunger-type magnet system has an armature consisting of two joined portions which are a cylindrical principal portion and a guide portion which serves as the printing hammer. The principal portion of the armature consis... | 01/31/1984 |
| 4425845 | Bank for accommodating several print ram units Bank for accommodating adjacent ram units. Each of these consists of a flat, narrow frame. A tongue-shaped ram, driven by an electromagnetic actuator, extends in a recess of the frame. For accommodating and guiding the individual print ram units, the bank... | 01/17/1984 |
| 4407194 | Print hammer An improved print hammer incorporating crossed-spring support wires having a round cross section so as to render the hammer relatively flexible in a direction lateral to hammer travel during printing. The spring wires are connected between a lower body po... | 10/04/1983 |
| 4392423 | Printing hammer driving apparatus A printing hammer driving apparatus for high-speed printers comprises a lever member acting as a hammer operating part, an armature forming a part of a magnetic circuit, and an electromagnet forming, together with the armature, the magnetic circuit. The l... | 07/12/1983 |
| 4388861 | Bank for accommodating several print hammer units Bank for accommodating adjacent ram units, each of which consists of a flat, narrow frame. An electromagnetic actuator for a ram, which is guided in two bores of the frame, is positioned in a recess of the latter. For accommodating and guiding the individ... | 06/21/1983 |
| 4386565 | Printer apparatus using electromagnet A printer of the needle or hammer impact type prints by release of spring-stored energy, driving the needle or hammer against a platen or character ring. A rotating cam restores the printing member to a locked standby condition after impact, and an electr... | 06/07/1983 |
| 4373440 | Hammer bank assembly A hammer bank assembly for use in line printers. The assembly includes an extruded metal rear frame having a uniform thickness and a plurality of machined mounting surfaces which are machined in accurate relationship with respect to one another. A pair of... | 02/15/1983 |
| 4362787 | Flag strip for use in print hammers This print hammer assembly method utilizes an elongated thin metal strip punched to form repetitive flag panels each having a flag region non-symmetrically linked to a surrounding frame, and a connector arm extending obliquely between the frame and flag. ... | 12/07/1982 |
| 4343239 | Electromagnetic release mechanism for print hammers or the like A magnet movable under the influence of magnetic edge forces is arranged between stationary magnets. The magnet is surrounded by a release coil in such a manner that the coil part contributing to the force active in the release direction is located in the... | 08/10/1982 |
| 4327639 | Print hammer assembly with multi-location impacts A print hammer assembly is disclosed comprising a support structure having a plunger at a first location thereon, and means for movably mounting the support structure with its plunger adjacent an electromagnetic actuator capable of being selectively energ... | 05/04/1982 |
| 4327638 | Magnetically actuated equipment Magnetically actuated impact equipment useful for high speed printers, punches or the like, is disclosed. Actuating magnets formed of materials characterized by wide hysteresis loops such as samarium-cobalt and mischmetal cobalt are disclosed. As disclose... | 05/04/1982 |
| 4324497 | Print hammer assembly with amplified multi-location impacts A print hammer assembly is disclosed comprising a support structure having a plunger at a first location thereon, and means for movably mounting the support structure with its plunger adjacent an electromagnetic actuator capable of being selectively energ... | 04/13/1982 |
| 4290356 | Actuator mechanism for a print hammer or the like A moving element is held without contacts in a relatively stable holding position, out of which it is released by the application of an external force. The relatively stable holding position is obtained by superimposing a potential field of magnet edges b... | 09/22/1981 |
| 4269118 | Print hammer assembly method This print hammer assembly method utilizes an elongated thin metal strip punched to form repetitive flag panels each having a flag region non-symmetrically linked to a surrounding frame, and a connector arm extending obliquely between the frame and flag. ... | 05/26/1981 |
| 4248148 | Time shared shifting print hammer assembly A plurality of print hammers are mounted on a horizontally movable carriage and adapted to scan a plurality of column positions of an impact printer. Each print hammer is provided with an energizible electrical coil which moves horizontally with the print... | 02/03/1981 |
| 4239401 | Impact printer hammer assembly In a solenoid driven hammer for an impact printer, the armature, which is driven by the magnetic field provided by the solenoid's coil, is integral with the hammer which strikes a printing element on a print wheel. The shape of the pole piece in the solen... | 12/16/1980 |
| 4233894 | Print hammer mechanism having dual pole pieces A print hammer mechanism which forms a magnetic path between the opposite fixed and free ends of an elongated resilient hammer element using a permanent magnet, a first pole piece terminating in a pole tip adjacent the free end of the hammer element and e... | 11/18/1980 |
| 4189997 | Printer A printer has a stationary electromagnet device, a hammer having a permanent magnet therein, and a resilient member coupled to the hammer. The permanent magnet may be moved upon electrical energization of the electromagnet device to cause the hammer to im... | 02/26/1980 |
| 4164180 | Impact printer including hammer bank assembly An improved hammer bank assembly includes a plurality of spaced-apart hammers, each of the hammers including a substantially planar hammer body containing an electrical coil, with each hammer body being supported for movement in a predetermined plane. A h... | 08/14/1979 |
| 4141290 | Print hammer for type printers Print hammer actuating apparatus of the double lever type in which one lever is moved in response to an input force and carries a pivotally mounted second lever which provides the output force through either an "inertia" principle or "ratio" principle. Th... | 02/27/1979 |
| 4109776 | Apparatus for marking an information carrying medium In a marking device for marking an information carrying medium, a marking tip is provided on an arm, and the arm is resiliently mounted by means of a leaf spring. In order to relieve stresses on the joints between the leaf spring and the arm, a region of ... | 08/29/1978 |
| 4101017 | Matrix print head A matrix print head comprising a plurality of electromagnets each having an associated armature; a plurality of elongated print elements having ends adapted for printing markings on a data carrier; each of said print elements being associated with an arma... | 07/18/1978 |
| 4077505 | Printing device for calculating, accounting and similar printing machines A dot-matrix printing device for a printing office machine, comprising a series of striking bars in the proximity of the recording medium movable transversely of the medium for printing dots in different locations. The bars are adapted to be actuated by t... | 03/07/1978 |
| 4046244 | Impact matrix print head solenoid assembly A dot matrix impact print head uses a combination of cooperating forces produced by a deflected spring and dual electromagnetic fields to increase the striking force of a printing wire or needle element without adversely affecting operating frequency capa... | 09/06/1977 |
| 4022311 | Electrodynamic actuator An actuator, which in a preferred embodiment, is shown in a wire matrix printer, and includes a magnetic structure having a support member associated therewith. When used in a wire matrix printer, the actuator includes a plurality of output members (in di... | 05/10/1977 |
| 4018155 | Ballistic print hammer assembly A ballistic print hammer assembly which includes a pivotally mounted print hammer driven by an electromagnetic actuator, characterized by low cost and ease of manufacture, high velocity and short dwell time. A rigid pivot upon which the hammer is mounted ... | 04/19/1977 |
| 4014258 | High speed printing apparatus Equipment for use in a high speed line printer or the like is disclosed which includes a series of independently actuatable print hammers mounted for reciprocation in adjacent side-by-side paths. All hammers are mounted on current carrying spring supports... | 03/29/1977 |
