Abstract: A method and apparatus for indexing the print hammer of typewriters or the like having a carriage supported type matrix positionable in X-Y directions to present a selected character for printing wherein the matrix positioning motor is used to index the hammer in advance of matrix positioning movement.

Abstract: A card printer comprises a type group consisting of a number of types being worked in a desired printing pitch. The types are in a lined-up arrangement in a horizontal direction and are received in a type receiving case so as to carry out an impact printing at their front. A correspondingly solenoid and a corresponding armature group electromagnetically drives each type in response to a control system. A feed system controlled by a control system feed successive cards and a ribbon in a horizontal direction facing the type group. At every place feed of the card by the feed system, a position on the card for a letter or a code to be printed and a lined-up position of a corresponding type are electronically checked and selected by a control system, and, only when the two card and type positions agree each other, a type or types in or are successively or at the same time driven electromagnetically by the corresponding solenoid and the corresponding armature so as to automatically print on the card.