JPS58208881A - Printer control method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (5) Technical Field of the Invention The present invention relates to a control system for an electrophotographic printer. Background of the technology Electrophotographic printers have excellent printing quality and printing speed, and operate extremely quietly. In recent years, printers have rapidly become popular in place of impact printers as output devices for printers, combinations, and printers. However, electrophotographic printers cannot perform simultaneous copying, so in order to cope with this, they are equipped with a page buffer and a modified data buffer. is stored in a page buffer, the parts that differ from the original for each multiple-page slip are stored as modification data in a modification data buffer, and each document is printed sequentially while modifying the original with the modification data. ing.

(Q: Prior Art and Problems Figure 1 shows the configuration of the control system of an electrophotographic printer that prints while modifying the original with modification data. 1 is a page buffer that stores the original print data line by line; Reference numeral 2 denotes a modification data buffer that stores modification data for modifying the original print data and parts of the original to be modified, that is, page numbers, line numbers, and in-line parts, segmented and stored in units of segments.

3 is a control unit for specifying page numbers and line numbers;
4 is a determination unit that searches the modification data buffer 2 and outputs the modification data corresponding to the page number and line number specified by the control unit 3 and the in-line portion to which the modification is applied; A modification unit reads the original line by line according to the specification of the control unit 3 and modifies it with the output of the read determination unit 4. 6 and 7 are a first row buffer and a row buffer that temporarily store and output the output of the modification unit 5 alternately for each row. 2 line buffers, 8 character generators.

In such a configuration, the determination unit 4 searches the modification data buffer 2 to find the corresponding modification data and modification portion before printing each line. However, when the total number of segments to be modified is large, The search takes time, and if the search time exceeds a predetermined time, a so-called overrun state occurs and the printer stops.

OBJECTS OF THE INVENTION An object of the present invention is to provide a printer control method that can reduce printer stoppages due to overruns in the prior art described above.

(Constitution of the Invention The printer control method according to the present invention includes a page buffer that stores the original print data line by line, modification data that modifies the original, and a part of the original to which the modification is applied, in segments. A device for modifying and outputting the original according to the contents stored in the modification data buffer; The table is created by referring to the modification data buffer and stored in the segment number buffer, and overruns are prevented by performing bright printing without referring to the table for each line. be.

2) Examples of the Invention The gist of the present invention will be specifically explained below with reference to Examples.

FIG. 2 shows the configuration of a control system according to an embodiment of the present invention, in which the same reference numerals as those in the conventional example in FIG. Output the modification data corresponding to the page number and line number and the in-line part to which the modification is applied, and when the number of outputs reaches the number of segments described below/<the number of segments of the relevant sex stored in the sofa, search the modification data buffer 2 a determining unit that cancels the
9 is a reference part that creates a table that refers to the modification data/(sofa 2 and stores it in the segment number buffer described later) by using the print-inhibited area provided at the beginning of the page before printing Bemage, and 10 is the original On the other hand, in this configuration, which is a segment number buffer that stores the number of segments to be modified as a table for each line, the determination unit 4' searches the modification data buffer 2 prior to printing each line and responds accordingly. It is the same as before to output the modification data and modification part, but in this example, when the number of outputs reaches the number of segments of the relevant type stored in the segment number buffer, the modification data buffer 2 is searched. Therefore, unnecessary searches are not performed. Therefore, as long as the segment to be output is not at the end of the table, dioverrun can be prevented.

q As described in detail, according to the present invention, overruns can be prevented and the number of times the printer must be stopped can be reduced.

Note that in the above embodiment, by storing the modification data in the modification data buffer 2 in the order of page number and line number, the modification data buffer is Reduce the time required for searching 2.
The chances of an overrun occurring can be further reduced.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example of a control system for an electrophotographic printer, and FIG. 2 shows each configuration of the control system of a dormitory embodiment of the present invention. In these figures, l is a page buffer, and 2 is a modified data variable. , lO is the segment number buffer. Agent Patent Attorney Matsuoka 76s″゛1m-0

Claims (1)

[Claims] a page buffer that stores all print data line by line; a modification data buffer that stores modification data that modifies the original and parts of the original to which the modification is applied as segments; In the apparatus for modifying and outputting the data according to the stored contents of the modification data buffer, a segment number buffer is provided to store the number of segments to be modified for each row in the original, and the segment number buffer is set to 0 for each row. A printer control method characterized by reference and output.