Abstract: A rotary wheel printer such as a daisy wheel printer comprises a rotatable platen for winding a print paper sheet partially therearound, a carriage movable along the platen, a type wheel mounted on the carriage in confronting relation to the platen and having a plurality of type fonts and a correcting section. First drive means are mounted on the carriage for driving the type wheel to rotate about its own axis, and hammer means are also mounted on the carriage for moving toward one of the type fonts or one of the correcting sections while it is held at rest in a printing position. Second drive means are mounted on the carriage for driving the hammer means, and ribbon feeder means are provided for successively feeding ink ribbon accommodated in a ribbon cassette mounted on the carriage and a correcting ribbon accommodated in the ribbon cassette.

Abstract: A serial printer of the print thimble type is provided with a character selecting mechanism tied in with the ribbon advance mechanism. A drive gear is rotationally rigid with the print thimble and is driven to rotate by a gear of greater thickness than the vertical shift experienced by the drive gear when switching between characters located on vertically spaced circumferences of the print thimble. A locking pawl mechanism rotationally locks the drive gear during printing to stabilize the print thimble to improve printing quality. The locking pawl is actuated by a cam mechanism driven by the ribbon advance.

Abstract: A printwheel 20 for a daisy wheel printer 10, the printwheel 20 including a hub portion 23 and a plurality of radially extending, deflectable petals 21 projecting therefrom. The petals include a pad or tip 24 thereon with print forming indicia on one surface 24a thereof and a striking surface on the opposite surface 24b thereof adapted to be struck by a print hammer 30 to move the indicia against paper 16 or other print receiving medium. The striking surface 24b comprises first and second, axially projecting inclined surfaces 25, 26, each of the inclined surfaces being disposed, with respect to the other, to subtend an angle `AN` therebetween in plan.

Abstract: A miniature printer includes character rings, each having a series of characters on the outer periphery thereof and teeth on a side surface thereof for selection of a character to be printed. The shaft carrying the character rings also has mounted thereon a radially-slotted disc through the slots of which a light beam is passed for signalling the angular position of said shaft, the light beam being directed at light-detection means. Electronic circuitry controls pawls for selectively stopping the character rings so that a selected character on each ring is brought to rest at a printing position for printing. The electronic circuitry also controls the intermittent feed of printing paper and printing ribbon. A gear-selection mechanism provides for a plurality of printing-paper feed rates as well as for holding the paper stationary when required.A number of the components are of unitary contruction to increase the ease of assembly and decrease the costs as well as the number of parts.

Abstract: A large type printer which continuously drives annular printing wheels having circumferentially spaced printing facets on their peripheries. The driving mechanism is a friction drive which may be overriden. Thus, the apparatus includes means for monitoring the rotational positions of each of the printing wheels and for stopping the rotation of the individual printing wheels when the respective facets are in printing position.