Canon Kabushiki Kaisha

Canon Denshi Kabushiki Kaisha

Hitoshi Hasumi

Hirofumi Hirano

Shoichi Inoue

Akiteru Furukawa

An impact type dot head for forming a character, symbol or the like by a dot matrix comprises: four printing wires arranged in a line in a wire holder; a guide member to guide the wires in parallel; four drive units each for pushing the rear edge of the wire in its axial direction and allowing the front edge of this wire to be projected to the printing position; and a foredamper consisting of a silicone rubber serving as a vibration damping material attached to the holder along its side surface. The drive unit includes an armature to clap the rear edge of the wire and an electromagnetic member to attract the armature. Each printing wire comprises a long thin-diameter portion on the front edge side, a short thick-diameter portion near the rear edge side and an intermediate taper portion connecting them. A coil spring having a diameter which is larger than the diameter of the front edge of the wire and is smaller than the thick portion is elastically attached to the wire, thereby allowing the wire to be pushed and returned from the printing position to the original portion. The printing wires therefore can be accurately guided with a simple and inexpensive structure and printing noise can be reduced.

Positioning of dampeners in a wire matrix print head

A printer for performing recording successively while a recording head moves backwards and forwards in a predetermined direction with respect to a recording medium such as paper. A paper hold roller for pressing the recording medium against a platen in the vicinity of a recording area opposite to a print head is detachable from the platen in relation to the movement of a carriage for carrying the recording head. The presence and absence of paper is detected to control the paper feed. An ink ribbon is provided which has color zones and an ink absorption zone in the direction of the ribbon width for multi-color printing by shifting the ribbon in the width direction by means of the carriage movement so that a selected color zone faces the recording head. The printer further includes a ribbon cassette, means for controlling paper insertion and feeding and means for cleaning the recording head. Also included are a paper bail control, color zone selector and paper detector.

Serial printer including a laterally reciprocable recording head, paper

A printer having a plurality of type belts and capable of printing in two colors by a rolling contact system is disclosed. The printer prevent mixing of colors of printed characters by lifting up and down a print paper for printing the characters at different positions on a platen by the different color type belts.

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Chichibu, Japan

Hitoshi Hasumi