Abstract: A print wire driving device for a wire dot printer includes a plate like member having slots therein. The slots are arranged opposite the cores of a magnetic core block. The cores are arranged in a circle and project from the core block. The slots extend radially from the center of the plate like member. A magnetic driving member is received in each slot so that it pivots therein when acted upon by the magnetic field of a respective magnetic core. A print wire is coupled to each magnetic driving member. Each print wire is guided by a wire guide having a wire nose which receives at its end a wire guide member from which the ends of the print wires extend to print. The wire guide includes structure for properly aligning two stacks of magnetic actuators.

Abstract: A printing head for a wire dot printer includes a plurality of printing levers connected to a corresponding plurality of printing wires. A plurality of guide holes are operable for guiding the distal ends of the printing wires beyond a nose of the printing head. Each guide hole corresponds to one of the plurality of printing levers. As viewed from the nose of the printing head, each printing lever extends radially from its corresponding guide hole and the inner ends of the printing levers form a zig-zag pattern. A plurality of plate springs provides the resilient force to push the printing levers and thereby the printing wires toward the nose of the printing head. A spacer for supporting the plate springs equalizes the effective length of each plate spring.

Abstract: A wire dot printer using a plurality of print wires to print on a printing medium. The printer includes a print head unit, a guide member defining a wire nose mounted on one end of the print head unit, and a wire guide member mounted proximate one end of the guide member and including a plurality of openings for guiding the print wires. A supporting member is mounted on the guide member on the one end thereof and has a first surface for coupling the supporting member to a carriage. The supporting member has an end surface having an opening therein corresponding in shape to that of the end of the guide member supporting the wire guide member. The wire guide member is positioned and supported in the opening in the supporting member. The guide member also includes a plurality of spaced wire guide plates which include a plurality of holes aligned therein through which the print wires extend for guiding the print wires.

Abstract: A printer utilizes an impact dot print head achieving higher drive acceleration and resultant velocity for driving a print wire without notable increase in the moment of inertia through the provision of magnetic influencing means on adjacent or opposite sides of the print wire lever fulcrum or rotation center. The length of the print wire actuating lever between the rotation center and the print wire connection on one side of the lever is longer than the length of the lever between the rotation center and the point of magnetic influence on the other side of the lever. Thus, angular moment for driving a print wire actuating lever can be increased without notable increase of the moment of inertia by employing a magnetic influencing means on opposite sides of the rotation center of the print wire actuating lever.

Abstract: An impact dot print head for printing without impact noise when returning to the non-printed position includes a base. An arm is mounted for movement between a non-print position and a print position. A print wire is mounted on the arm. A first device selectively drives the arm towards the print position by bias or magnetic force. A second device returns the arm to the non-print position and maintains the arm at that position without causing the arm to impact any member of the print head when returning to the print position. The second device uses balanced magnetic attraction or repulsion and/or bias forces to hold the arm out of contact with other parts of the printer other than at its point of mounting when at the non-print position.

Abstract: A wire guide member for use in a wire type dot printer for guiding print wires and having a guide member with grooves. The wire guide member includes a first plate formed of synthetic resin, a second plate being formed of a wear resistant material and a third plate also formed of a synthetic resin. Through-holes in the plates are aligned to receive the print wires. Also disclosed is an assembly for supporting a member in a wire type dot printer.

Abstract: A print wire driving device for a wire dot printer includes a plate like member having slots therein. The slots are arranged opposite the cores of a magnetic core block. The cores are arranged in a circle and project from the core block. The slots extend radially from the center of the plate like member. A magnetic driving member is received in each slot so that it pivots therein when acted upon by the magnetic field of a respective magnetic core. A print wire is coupled to each magnetic driving member. Each print wire is guided by a wire guide having a wire nose which receives at its end a wire guide member from which the ends of the print wires extend to print.

Abstract: A print wire driving device for a wire dot printer includes a plate like member having slots therein. The slots are arranged opposite the cores of a magnetic core block. The cores are arranged in a circle and project from the core block. The slots extend radially from the center of the plate like member. A magnetic driving member is received in each slot so that it pivots therein when acted upon by the magnetic field of a respective magnetic core. A print wire is coupled to each magnetic driving member. Each print wire is guided by a wire guide having a wire nose which receives at its end a wire guide member from which the ends of the print wires extend to print.

Abstract: A print wire driving device for a wire dot printer includes a plate like member having slots therein. The slots are arranged opposite the cores of a magnetic core block. The cores are arranged in a circle and project from the core block. The slots extend radially from the center of the plate like member. A magnetic driving member is received in each slot so that it pivots therein when acted upon by the magnetic field of a respective magnetic core. A print wire is coupled to each magnetic driving member. Each print wire is guided by a wire guide having a wire nose which receives at its end a wire guide member from which the ends of the print wires extend to print.

Abstract: An improved wire dot print head assembly for a wire dot printer including a resilient securing spring for holding the assembly elements secure is provided. The print head assembly includes a plurality of print wires, each selectively driven through a print nose by a plurality of electromagnets disposed about the print wires. A pivotable operating member engaged to the input end of the wire is actuated by an electromagnet with the fulcrum end of the operating member secured by a holding member. The holding member, nose, electromagnet and operating member are compressively retained by the resilient securing spring. The holding member is formed with a projection extending through the fulcum portion of the operating member to minimize magnetic reluctance of the magnetic flux by minimizing an air gap between a plunger mounted on the operating member and a yoke plate. The print head constructed in accordance with the invention permits improved dimensional accuracy in a simplified construction.

Abstract: A print hammer having an improved head portion for striking a selected moving print character member in a line printing device is provided. The printing device prints when the print hammer strikes a print character member at a predetermined print position forcing the character member against an ink ribbon, a print paper and a platen. The head portion is formed with an inclined surface facing the direction of approaching adjacent character members to drive an adjacent character member striking the side of the print hammer around the print hammer for avoiding jamming and damage to character members and print hammers. In a preferred embodiment the head portion is substantially "V" shaped with the apex of the V disposed in a direction opposite to the movement of the print character members.

Abstract: An ink-ribbon reversing device for use in a printing machine having an ink-ribbon winding mechanism is provided. The device includes two ink-ribbon spools and associated spool gears mounted on separate spool shafts spaced apart from each other. A drive shaft is positioned between the spool gears with an arm rotatably mounted thereon. A first gear is fixed to the drive shaft. A second gear rotatably mounted on one end of the arm is in engagement with the first gear. One of two actuatable change-over levers abuts the free end of the arm to maintain engagement between the second gear and one spool gear to drive the associated ribbon spool. At the completion of ribbon winding, the change-over lever is displaced, releasing the arm which rotates about the drive shaft to abut the other change-over lever and engage the second gear with the other spool gear to drive the associated ribbon spool.