Donald V Hebert

US Patent:

44785283, Oct 23, 1984

Filed:

Sep 24, 1979

Appl. No.:

6/078289

Inventors:

Donald G. Hebert - San Ramon CA

International Classification:

B41J 312

US Classification:

400124

Abstract:

A wire matrix print head assembly in which the print wires are operably supported in one-piece bearing and guide passage block member in an elongated wire housing with wire actuating armature members arranged in a circular array between radially innermost and outermost poles of electromagnetic armature actuating devices and an armature retaining cover member centrally adjustably connected to the wire housing and having armature confining slots holding the armatures in pivotally displaceable operable association with the poles, the armatures being pivotally supported on the radially outermost edge surfaces of the outermost poles with or without resilient biasing devices continuously holding the armatures in engagement with the pole pivot surfaces without applying a moment of force and peripheral portions of the cover member being mounted in rigid abutting engagement with end surfaces of the outermost poles.

US Patent:

47550686, Jul 5, 1988

Filed:

Jan 30, 1987

Appl. No.:

7/008825

Inventors:

Donald G. Hebert - Alamo CA

Assignee:

DH Technology, Inc. - San Diego CA

International Classification:

B41J 312

US Classification:

400124

Abstract:

A dot matrix print head assembly comprising a plurality of circumferentially spaced armature members for operating associated wire members and a plurality of circumferentially spaced inner and outer pole devices separated by rectangular slots. A coil is mounted on a bobbin member associated with each inner pole. A portion of each bobbin member is mounted in one of the slots and has wire connecting pin terminals extending through a flange portion of a wire housing for connection to a printed circuit board.

US Patent:

40519414, Oct 4, 1977

Filed:

Jun 28, 1976

Appl. No.:

5/700417

Inventors:

Donald G. Hebert - San Ramon CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 350

US Classification:

197 1R

Abstract:

A matrix print head comprises stylus guide means; a plurality of electromagnetic structures coupled to the guide means, each of the electromagnetic structures including a pole piece; a plurality of armatures disposed radially about the guide means, each of the armatures being associated with one of the electromagnetic structures to form an electromagnetic actuator for transferring electromechanical energy to a stylus, and each of the armatures having an inner end and an outer end projecting outwardly of the associated pole piece; a plurality of styli respectively associated with the plurality of armatures, each stylus being carried by the guide means and having an armature engaging end for engaging the inner end of the associated armature and a printing end for impacting a record medium when the stylus is propelled through the guide means by energization of the associated electromagnetic actuator; and an improved armature retainer coupled to the guide means for maintaining each armature in engagement with its associated pole piece. The armature retainer comprises a relatively rigid base member having a central portion connected to the guide means and a peripheral portion including means for receiving each armature at a predetermined location between its inner and outer ends; and a relatively resilient biasing member mounted to the peripheral portion of the base member for engaging the outer end of each armature in order to bias each armature into engagement with its associated pole piece.

US Patent:

46406336, Feb 3, 1987

Filed:

Mar 15, 1985

Appl. No.:

6/710633

Inventors:

Donald G. Hebert - San Ramon CA

Assignee:

DH Technology, Inc. - San Diego CA

International Classification:

B41J 312

US Classification:

400124

Abstract:

A matrix head wire print position shift apparatus which includes a plurality of longitudinally movable print wires which are mounted in an elongated wire housing and are disposed in guides which movably support the longitudinally movable print wires for longitudinal movement within the housing in response to wire drive armatures which cause longitudinal movement of the movable print wires between a non-print position and a print position. A wire drive end bearing plate mounted in the housing supports the front end portions of the longitudinally movable print wires and is transversely shiftable relative to the housing between a first print position and a second print position by a transversely shiftable support device mounted in and guidably supported by the housing. In the first print position the print wire devices are selectably operable to print characters defined by a first set of adjacent substantially tangential circularly shaped dots. In the second print position the wire print devices are selectably operable to repeat printing of the characters with a second set of overlapping circular dots which are offset from the first sets of dots by approximately one half of the diameter of the first set of dots.

US Patent:

39943810, Nov 30, 1976

Filed:

Apr 23, 1975

Appl. No.:

5/570683

Inventors:

Donald G. Hebert - San Ramon CA

Assignee:

The Singer Company - Elizabeth NJ

International Classification:

B41J 310

US Classification:

197 1R

Abstract:

A wire matrix print head comprised of a plurality of impact print wires or styli, each having an input end for receiving an impact and an output end for delivering an impact to a record medium through an inking ribbon. The impact end of said wires or styli are arranged in a specialized elliptical format while the output end of the wire styli are formed into a planar straight line configuration, thus providing for a minimal amount of bending arc along the length of the styli. This configuration permits direct transmission of the impact forces to the output end and permits each stylus to be of equal length to the other styli. Efficacious provision is made for adjusting the stroke length of each stylus even though a uniform electromagnet for each stylus is used to provide the activating or impact impulse.

US Patent:

41859294, Jan 29, 1980

Filed:

Mar 10, 1978

Appl. No.:

5/885186

Inventors:

Donald G. Hebert - San Ramon CA

International Classification:

B41J 312

US Classification:

400124

Abstract:

A wire matrix print head assembly having bearing and guide apparatus for a plurality of circumferentially spaced reciprocable wire members comprising one or more elongated bearing members each having a plurality of elongated passages, there being one passageway in each bearing member for each wire member and the passageways for each wire member in each bearing member being aligned and interconnected to provide a continuous wire passage receiving a majoral portion of each wire member and comprising in sequence a relatively long length enlarged first inlet and guide portion; a relatively short length intermediate second bearing portion; a relatively long length intermediate third guide portion; a relatively short length intermediate fourth bearing portion; a relatively long length intermediate fifth guide portion; and a relatively short length terminal sixth bearing portion, the guide portion enabling continuous uninterrupted slidable insertion of the wire member during assembly while also enabling free reciprocating movement of the wire member after assembly without circumferentially restrictive contact with the surfaces of the guide portions and the bearing portions also enabling continuous uninterrupted slidable insertion of the wire member during assembly while also providing circumferentially restrictive bearing support for relatively short length axially spaced portions of the wire members after assembly.

US Patent:

42304121, Oct 28, 1980

Filed:

Mar 17, 1978

Appl. No.:

5/887927

Inventors:

Donald G. Hebert - San Ramon CA

International Classification:

B41J 312

US Classification:

400124

Abstract:

A wire matrix print head assembly having a plurality of circumferentially spaced armature members in which each armature member is operatively associated with a pair of radially spaced magnetic pole members and a coil associated therewith, each armature member being mounted between the pole members and the wire printing members with the end surfaces of the pole members facing the direction of movement of the armatures during printing movement from a non-print position to a print position, the inner pole member end surface providing a pivotal support surface for the armature member and also providing a locating surface engageable with a portion of the armature housing opposite thereto, a resilient biasing member mounted on the armature housing portion and engaging the armature member opposite the pivotal support surface, a resilient support and locating member engaging the radially innermost end portion of the armature opposite the associated wire printing member, and an axially adjustable sleeve means for supporting and locating the resilient support and locating member.

US Patent:

42300380, Oct 28, 1980

Filed:

Jun 23, 1977

Appl. No.:

5/809423

Inventors:

Donald G. Hebert - San Ramon CA

International Classification:

B41J 310
B41J 938

US Classification:

101 9305

Abstract:

A wire matrix print head assembly in which armatures are mounted between pairs of magnetic pole members and wire printing members with coplanar radially spaced pole member end surfaces facing the direction of movement of the armatures and the wire printing members during printing movement from a non-print position to a print position and the pole member end surfaces providing a first radially innermost pivotal support means engageable with the armature members only during an initial portion of the armature movement and also providing a second radially outermost pivoted support means engageable with the armature members only during a terminal portion of the armature movement.