| 摘要 |
1463960 Printers INTERNATIONAL BUSINESS MACHINES CORP 13 May 1975 [25 July 1974] 20012/75 Heading G4H A dot matrix printer includes a print head carrying a plurality (e.g. a column) of individual dot printing means to print data on a series of parallel print lines on a record medium movable relative to the head, and means to control the dot printing means to print dots of a series of columns transverse to the print lines, a full-size character requiring dot printing in both the two end print lines, the control means being operable to provide a shortened (in height) printed character by excluding dot printing for the character from one only of the two end print lines. Fig. 13 shows the column of dot printing wires 124a-124h, all used for a full-sized character, full-sized characters usually using 7 columns of dots and having a 3-column blank space between them, as indicated by the wording. Fig. 13 also shows two shortened characters "5" and "8" as part of the fraction "#", the two lowest lines not being used for the "5" and the two highest not being used for the "8" but the slash spans the "blank space" and intrudes into the normal character areas as shown. Successive 8-bit columns of data to control the print wires are read from a ROS print matrix table addressed with an address formed by concatenation and logical combination of the bits of a print option counter (i.e. a column counter), the output of a print line buffer and a signal indicating whether or not the system is in an intercharacter space in which a slash is required (a slash decoder responding to the output of the print line buffer). The record medium is a ticket or continuous strip of tickets, two print heads being provided side by side with their print wires in line acress the ticket/strip. Two print line buffers are provided, use of the ROS print matrix table being time-division-multiplexed between the two heads, which are dealt with in turn for each column of dots. A mieroprogramme control unit, using an ALU and main, local, external and control stores, is also described as a replacement for most of the electronics of the embodiment above. Information can also be recorded on the ticket(s) magnetically (and read for checking).
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