Citizen Watch Company, Ltd.

Tsutomu Ikehata

Makoto Yasunaga

Katsuya Masuda

Hirofumi Suzuki

Yukihisa Kato

Hiroshi Ikeda

Yoshimasa Tai

Takao Michioto

A gap adjusting device moves a print head vertically via a carriage shaft eccentrically supported by a displacement gear. The displacement gear is provided with a gap lever, which restricts rotational movement of a driving force transmission mechanism by abutting on a stop when a pulse motor drives the print head to move away from a platen. The pulse motor becomes out of phase, thereby defining the position as a reference position. The amount of rotation of the pulse motor is adjusted, starting from the reference position, thereby adjusting a vertical position of the print head. The reference position of the print head is established without the risk of causing damage to dot pins, by defining the initial condition of the pulse motor.

Gap adjusting device of an impact dot printer

A print head for a dot matrix printer has a yoke having a plurality of cores, a plurality of armatures, each corresponding to the core, a plurality of knife edges is formed on the yoke, and a receiving corner is formed on the armature which engages the knife edge so as to be pivoted about the knife edge.

Print head for dot matrix printer

A printing head for a printer comprises a plurality of armatures arranged radially, a drive section including a plurality of drive units which support outer ends of the respective armatures to swing the same, respectively, a plurality of needles engaged respectively with inner ends of the respective armatures and swingable during swinging movement of the armatures, an armature stopper for limiting strokes of the respective armatures on a side opposite to a side where the needles project, and a plurality of guide elements for guiding respectively the armatures in sliding directions of the needles, the intermediate member has a first step arranged at an outer surface of the intermediate member and a second step arranged at an inner surface of the intermediate member, the first step is directed toward a side where the needles project and are abutted directly or indirectly against armature support surfaces of the drive section, respectively, the second step is directed toward a side opposite to the projecting side of the needles, and the armature stopper is abutted against the second step.

Printing head for printer

In a printing head for a printer, forward end surfaces of respective outer and inner peripheral walls of a solenoid base and forward end faces of a plurality of respective core sections arranged between the inner and outer peripheral walls along a peripheral direction are formed coextensive with each other. Outer-peripheral-wall abutment surfaces and inner-peripheral-wall abutment surfaces of armatures having respective sections disposed to be drawn opposite to the core sections are formed to be coextensive with each other. Core-section opposed surfaces of the sections to be drawn are formed coextensive with the outer-peripheral-wall abutment surfaces and the inner-peripheral-wall abutment surfaces. In another aspect of the invention, the core-section opposed surfaces are so formed as to be depressed toward a side opposite to the core sections.

Printer head for printer

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 array in the same order as that of the needles on the needle column. Two solenoids respectively corresponding to needles disposed at lower ends of the two needle columns are designed to generate magnetic fluxes whose directions are the same. During underline printing where these two solenoids are alternately energized, the magnetic flux generated by one of the solenoids never acts to increase an effective magnetic flux of the other solenoid at an initial stage of the excitation period thereof, so that the needle of the first solenoid reaches its forwardmost position at an appropriate time. The needle is rapidly restored and its tip prevented from being caught by the ink ribbon. After the forwardmost position is reached by the needle associated with the first solenoid, the magnetic flux generated by the second solenoid never acts to increase the magnetic flux of the first, permitting rapid restoration of the needle.

Printing head using staggered arrangement needles

A print head for a dot printer having a plurality of needles for printing by projecting the needles selectively from the print head. The print head has a solenoid base having a plurality of solenoids arranged in a circle thereon for driving the needles, a heat conductor having one side fixed in heat conducting relationship to one surface of the solenoid base and having a heat radiating portion extending in one direction from the solenoid base for radiating heat conducted thereto from the solenoid base, and a connecting portion extending in another direction from the solenoid base, a printed circuit board mounted on the side of the heat conductor opposite the one side, and an electrical connector for receiving a cable for supplying signals to a circuit on the printed circuit board and mounted on the connecting portion and electrically connected to the circuit on the printed circuit board.

Print head

An improved print head for a dot matrix printer is provided. The printing is performed by wires projecting from said print head. The movement of the wires is controlled by the movement of armatures which contact an armature base. The construction of the base from a liquid crystal polymer or an aromatic series polyester resin results in improved vibration damping which in turn results in quieter printer operation.

Print head having reduced noise and vibration characteristics

A printing head comprises a plurality of printing wires which are disposed in alignment with each other and for reciprocal motion. Each of the printing wires is formed by a main body member made of powdered high speed steel, and a chip member made of a rhenium base alloy and welded to an outer tip end of the main body member by means of partial welding. Further, a wire guide member made of zirconia is provided to guide the wire for reciprocal motion of the wire.

Printing head for use in dot printers

A leaf spring unit has a leaf spring cantilevered on a supporting member, an armature secured to one side of a free end portion of the leaf spring, and a wire secured to the armature. A reinforcement plate is secured to the other side of the leaf spring opposite to the armature. An inner edge of the reinforcement plate is inwardly extended from the inner side of the armature so as to reinforce a part of the leaf spring.

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Sakado, Japan

Tsutomu Ikehata