Abstract: An impact type dot printer is controlled to enable a printing head to start printing dot-matrix characters at aligned print starting positions. A print timing signal is generated in synchronism with rotation of the platen, the print timing signal being indicative of positions in which a print hammer strikes projections on a platen and composed of a pulse-free blank and a plurality of subsequent pulses in one cycle. The printing head is moved from a home position for pre-spacing prior to a normal printing operation. A home signal is generated when the printing head leaves the home position. The number of pulses of the print timing signal is counted until a first pulse-free blank arrives while the printing head is moving for pre-spacing. Data on a phase relationship between the print timing signal and the home signal is stored on the basis of the counted number of pulses.

Abstract: An apparatus for forming a character in which picture elements as indication elements are formed in the shape of a matrix to create a character, such as a letter, a numeral, a symbol or the like, in this case the magnifications of the character in both a longitudinal and a lateral direction are suitably increased or reduced and, in case the character has become obscure as a result of such enlargement, an interpolation is performed to the character to render it clear. The apparatus is used, for example, in the case of forming a character with printer.

Abstract: Between picture elements of a character, such as letter, numeral and symbol, which is formed of a pattern of the separate display picture elements, a display picture element for interpolation is formed in conformity with predetermined rules, so that the shape of the character as intended to be displayed has its naturalness held and that the character can be formed in a proper size.