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 the armatures of corresponding electromagnets for impressing individual dots of characters. The striking bars are guided in the proximity of the recording medium by a movable guide which effects the transverse movement and each electromagnet has a fixed core and a movable armature in articulated engagement with the corresponding bar. Each armature is provided with an actuating spring which tends to move the armature away from the core of the electromagnet. A permanently magnetized rubber establishes a bias magnetic flux such as to keep the armatures at rest in opposition to the action of the actuating springs and a plurality of windings can be energized selectively to generate a flux opposed to the bias flux so as to allow the actuating springs to move the armatures away from the cores for impression of the dots. The device further includes a reloading member which acts on the armatures to bring them back into contact with the cores of the electromagnets.
A dot matrix printing device for electronic calculator comprising a plurality of electrically heatable dots of an insulating plate aligned therebetween and spaced according to a constant pitch to print the digits of the calculator amounts. A symbol dot is located adjacently to the terminal digit dot which prints the least significant digit of the amount, aligned with the other dots of the plurality. The symbol dot is spaced from the terminal digit dot by a distance greater than the constant pitch of the other dots and prints the explanatory symbols of the amounts leaving a blank between the digits and the symbols of the amounts.
The device for driving dot printing bars in a dot printer comprises at least one dot printing bar movable between two positions, an electromagnetic device controlling the operation timing of the bar, a periodically reciprocal operation member operable when the electromagnetic device is made conductive and means operable to shift the dot printing position of the bar whereby the bar springs out to effect dot printing in response to the operation of the operation member when the electromagnetic device is energized to attract the operation member thereto.
4373438 - Dot printer - Owned by Shinshu Seiki Kabushiki Kaisha (Nagano,JP) Kabushiki Kaisha Suwa Seikosha (Tokyo,JP)
A rounded end on a pivoted arm impacts a print medium through an ink ribbon to form a printed dot on the print medium. For printing, a wire drawn by an electromagnet acts on the arm between the pivot axis and the rounded end. A plurality of arms and electromagnets are spaced apart along a lateral row and mounted on a carriage for reciprocal lateral translation over a distance approximating the space between arms to print an entire horizontal row of dots forming a portion of a character line. Arms are driven separately or in combinations. The gap in the electromagnet is simply fixed to reduce power requirements.
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 electromagnet attracts a moveable core to allow release of the printing member at selected times for printing. The gap between the moveable and fixed cores of the electromagnet is periodically closed mechanically and electrical energization of the electromagnet only maintains the attracted state of the fixed and moveable cores.
A carrier frame is provided for oscillation along a printing platen of the printer and is comprised of two integral, U-shaped sections facing each other at right angles. A plurality of electromagnetic actuators are arranged in one section and include a yoke, a coil, and a pivot armature in each instance. A free end of the pivot armature projects into the other small section. A relatively short print needle is guided in one wall portion of the second section and has its rear end abutment with the projecting end of the armature; an adjusting screw adjusts the relative disposition of the pin-like needle and the armature; the common pivot axis for all armatures is established by a resilient string in a cover plate across the larger U.
