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US 4,906,116 AGranted
Wire-dot print head
AssigneeOki Electric Industry Co., Ltd.
InventorsHirokazu Andou, Minoru Teshima, Mitsuru Kishimoto, Noboru Ohishi
Life of this patent
Estimating the term…
Abstract
In a spring-charge wire-dot print head, a support part of a plate spring is clamped, at its outer periphery, between a protruding member disposed on the front surface of the outer periphery of a spacer and a protruding member disposed on the rear surface of the outer periphery of a yoke, and the support part of the plate spring is additionally supported, at the rear surface of its inner periphery, by a protruding member disposed on the front surface of the inner periphery of the spacer.
Claims12
A wire-dot print head comprising:
- a print wire having a front end an a rear end;
- an armature to which said rear end of said print wire is fixed;
- a plate spring having a support part and a free end part to which said armature is attached;
- an annular spacer having a front surface;
- a front yoke having an annular part having a rear surface confronting said front surface of said annular spacer;
- and
- said support part of said plate spring is held between said front surface of said spacer and said rear surface of said annular part of said front yoke;
- wherein protrusions are provided on the outer periphery and inner periphery of said front surface of said annular spacer and on the outer periphery of said rear surface of said front yoke, to be in engagement with said support part of said plate spring.
5 more elements
A wire-dot print head comprising:
- a substantially disk-shaped rear yoke:
- electromagnets each comprising a core mounted on the front surface of said disk-shaped rear yoke and near the center of said disk-shaped rear yoke, and a coil wound on the core;
- an annular permanent magnet;
- an annular spacer having a protrusion on its front surface of the outer periphery and its inner periphery;
- a front yoke having an annular part having a protrusion on the rear surface of its outer periphery;
- said annular permanent magnet, said annular spacer and said annular part of said front yoke being stacked with each other, mounted on said front surface of said disk-shaped rear yoke and disposed on the peripheral part of said disk-shaped rear yoke;
- a plate spring having an annular support part and a plurality of radial parts extending radially inward from said annular support part;
- a combination of an armature and a print wire associated with each radial part, the print wire being attached to the armature, and the armature being attached to the radial part so that the armature is in the vicinity of the front end of the core of one of the electromagnets;
- wherein said armature is attracted toward said core when the electromagnet is not energized and, when the electromagnet is energized, the magnetic flux due to the electromagnet cancels the magnetic flux due to said permanent magnet and said armature is released whereby a print wire attached to the armature projects for effecting printing;
- protrusions are provided on the outer periphery and the inner periphery on the front surface of said spacer and on the outer periphery of the rear surface of said front yoke;
- and
- said support part of said plate spring is clamped between the protrusions on the front surface of said spacer and said protrusion on the rear surface of said front yoke.
9 more elements
Dependencies are inferred from the claim text.