Abstract: A printer head of improved design for a dot line printer, for high speed data printout. The printer head features independent magnetic circuits for driving each of the printer needles which form printed dots, with the magnetic circuits acting on armatures carrying the printer stylus, the armatures being mounted on the free ends of leaf springs. The leaf springs can be designed for optimum performance, irrespective of magnetic circuit considerations, and the head assembly is based on a lightweight non-magnetic frame. Substantially higher printing speeds than have hitherto been possible are attainable, due to reduced heat buildup in the drive coils, reduced interference between adjacent magnetic circuits, and optimized spring performance.

Abstract: A head for an impact type of dot line printer comprising an array of printer wires mounted on leaf springs for forming dots on a printing paper, selectively controlled for impact on the paper by signals applied to corresponding magnetic flux circuit paths comprising coils formed on coil cores and permanent magnets, and having an improved form of construction whereby each printer wire is controlled by an independent magnetic flux circuit path and with pairs of coil cores being mounted on separate magnetic flux path members. The configuration enables a high density of printer wires to be achieved, with elimination of magnetic interference between adjacent magnetic flux circuit paths leading to uniform printing density.

Abstract: A stylus driving apparatus for an impact dot line printer is provided with a magnetic first yoke adjacent one side of a permanent magnet, a plurality of magnetic cores each having an exciting coil, a plurality of magnetic leaf springs disposed adjacent to a tip end of each core at a free end thereof, an armature secured to the free end of the leaf spring, and a magnetic second yoke diposed on the other side of the permanent magnet. The second yoke has a plurality of recesses. In the waiting position where the free end of the leaf spring is attracted to the tip end of the core, at least a part of the armature is surrounded by the inner wall of the recess of the second yoke.

Abstract: A dot matrix impact printer for color printing comprising a platen and a print wire. The platen comprises a plurality of members made of porous material containing different colors. The print wire and platen member are driven to a position adjacent each other and the print wire is moved to force a paper to the platen, so that a dot is printed on the paper with color ink contained in the corresponding member of the platen.

Abstract: A cross point type dot matrix impact printer comprising a platen and a plurality of hammers arranged in the axial direction of the platen. The platen has a helix composed of a plurality of protrusions helically provided on the periphery thereof. The hammer has a hammer head which strikes each protrusion during the rotation of the platen for performing the dot matrix impact printing.

Abstract: A print wire driver for dot matrix impact printers comprises a pair of yokes made of magnetic material, a solenoid disposed between the yokes, an armature extending through the solenoid, and a print wire connected to the end of the armature. One of the yokes has first and second projected yoke ends, the other has third and fourth yoke ends, which are opposed to each other. The solenoid is disposed between the projected yoke ends. Between the yokes, a permanent magnet is provided to magnetize both yokes in reverse polarity with each other. The armature and four yoke ends are so arranged as to make two magnetic circuits, one of which is the path connecting the first yoke end, armature and fourth yoke end, and the other is the path connecting the second yoke end, armature and third yoke end. The solenoid is excited alternately in polarity to alternately magnetize the armature. Thus, the armature is reciprocated by the attractive and repulsive forces of the magnetic circuit to drive the print wire.

Abstract: A dot matrix impact printer of the type which has a platen having a helical projection, a plurality of hammers arranged in the axial direction of the platen to cross the helical projection, and means for feeding an ink to the periphery of the helical projection. The platen is rotated and the hammer strikes the helical projection interposing the recording paper, so that dot matrix printing may be performed. In order to prevent the contamination of the recording paper with the ink, there is provided a separating member of resilient material along the helical projection. The periphery of the separating member is slightly higher than the helical projection, so that the recording paper is separated from the helical projection. The separating member is compressed by impacting the hammer so that the ink may be transferred to the paper.

Abstract: A device for feeding an ink ribbon for use in a printing machine in which the ink ribbon is reciprocally run by rotating reels on which the ink ribbon is wound. The device has a main drive member, two driven members, a driving force transmission member, a follower members, a spring and a movement control member and thereby providing a useful and effective device without a nonsensitive zone upon changeover of the running direction of the ink ribbon.

Abstract: A printing apparatus includes a type drum the outer circumferential surface of which has a first set of type including a plurality of type faces arranged in a counter-clockwise spiral and a second set of type including a plurality of type faces arranged in a clockwise spiral. The type drum is both reciprocated and rotated in synchronous fashion by cooperation between reciprocating and rotating drive means so that the sets of type disposed on the type drum pass the positions of a plurality of printing hammers confronting the drum and adapted to perform printing by striking the type faces on the drum through an inked ribbon and recording medium.

Abstract: An inked ribbon changeover mechanism for a printing machine, in which a plurality of inked ribbons are looped over a plurality of guide members, respectively. The guide members are carried on a movable member, which is arranged to be movable to first and second positions relative to a printing head such that a selected one of the inked ribbons is placed in an operative position in which a portion of the selected one of the inked ribbons is located in a space between the printing head and a record medium when the printing head is in a printing position.

Abstract: A printer especially suitable for printing letters and symbols on a recording media having portions of different thickness such as a bank deposit pass book foldable along a folding line. A movable platen is comprised of left and right units and a central unit which are moved toward and away from the recording medium by rotary cams and spring means so that the upper surfaces of the left, right and central units of the platen are always maintained in the same plane parallel with the running path of the printing head. Satisfactory printing can be made irrespective of the difference in the thickness of the portions of the recording medium.

Abstract: A recording medium feeding apparatus for printer is disclosed wherein a web of a recording medium is fed and taken up by a take up reel. A web feeding mechanism and a reel driving mechanism are operated through a coupling means by a spring means in which energy is stored by a common driving means.