JPS609316B2 - printer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an IJ printer that outputs information on a screen, and particularly to one that displays dots on the screen.

In order to make effective use of information processing devices, display devices are connected, but the need to record the screen displayed on the display onto recording paper has led to demand for printers as hard copy devices.

Generally, display devices mainly display characters, but it is desirable that they can also display graphics. This invention is capable of displaying not only characters but also graphics, making effective use of a circulating memory device (refresh memory), detecting non-display areas, not printing on non-display areas, and printing paper. The purpose is to obtain the same effect as printing by only feeding. The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 is a block diagram showing an example of a printer control unit implementing the present invention, and FIG. 2 is a diagram showing the state of printing, showing an example of 7 rows and q columns, indicating the letters ABC. There is. For convenience of explanation, a case will be described here in which characters, symbols, or figures displayed on the display are displayed in a dot pattern of n rows and q columns. In Figure 1,
1 is a display device (not shown).

) is a circular storage device used to display information on the screen and contains the patterns to be represented on the display. This circulating storage device 1 circulates in the direction of the arrow by a control circuit (not shown) that controls the display. 2 is a decoder circuit, which outputs the following predetermined output according to the horizontal synchronization signal and vertical synchronization signal of the display device, and its output selectively opens and closes gates ○ and ~G7, and has a configuration of 7. It consists of a forward counter and a decoder that decodes the contents of the counter.

That is, when a, to q, appear in the output of the circular storage device 1, gate G is opened, and when a2 to q2 appear, gate ○2 is opened. If we consider the case where n rows and q columns are currently displayed on the display, it is necessary to fetch the necessary information from the circular storage device 1 in order to print this out.

For example, if we consider a printer that prints 7 dots sequentially, a 7-column buffer storage device is required, and in order to print columns 1 to 7, it is necessary to extract information a to q7. a, ~qn stored in the circular storage device 1
The information a, ~q, of the information up to
, a2 to q2 to BF2, a3 to q3 to BF3,
a4 to q4 to BF4, a5 to q5 to BF5, heat to q
Place 6 in BF6 and a7 to q7 in BF7.
When the information stored in the buffer storage devices BF, .about.BF7 is sent to the printer 3 via the drivers A, .about.A7, the head drive circuit (not shown) in the printer 3 sequentially moves the head from column a to column q in FIG. When moving from column to column and at a point where there is printing information, for example a3 to a7, the part corresponding to a3 to a7 of the head made up of dots operates and prints sequentially, and printing is performed by moving the head from column a to column q. After that, the paper is fed to prepare for printing the next line.

In this way, it is possible to print as shown in FIG. When the printing of the 1st to 7th lines is completed, it is possible to similarly introduce the 8th to 14th lines into the buffer storage devices BF, -BF7 and perform printing.

By repeating this operation up to the nth line, the entire screen can be printed. In such a display hard copy device, the present invention may not necessarily display the entire screen on the screen, in which case the present invention detects the presence or absence of screen information and determines whether to print and feed the paper or only feed the paper. It is determined that the non-displayed areas are used only for paper feeding, and the purpose is to shorten printing time. That is, in the printer device having the above-mentioned configuration, the present invention provides means for monitoring the contents of the circulating memory device while inputting the output of the circulating memory device to the buffer memory device, and this monitoring means controls the printing. If printing is not required, paper is only fed, and if printing is required, output edited and stored in a buffer storage device is sequentially taken out and printed.
To explain with reference to FIG. 1, the sampling pulse output from the decoder circuit 2 is outputted at each timing when the information in the circulating storage device 1 is to be taken into each of the buffer storage devices BF, BF7.
In addition to the R gate ○8, the output signal of this OR gate G8 and the information of the circular storage device 1 are added to the AND gate ○9, and the output signal obtained is added as a set signal to the flip-flop FF. ．． The printer 3 is configured so that the flip-flop FF, glue set signal is sent at the end of paper feeding of the printer 3, and the printer 3 is connected to the flip-flop FF,
is set and there is an output signal, buffer storage device B
Printing is performed by obtaining output from F, ~ BF7, and after this printing, the paper is fed. If there is no output signal at FF, only paper feeding is performed, and after each paper feed, the next printing operation (to the buffer storage device) is performed. (from importing information to printing and paper feeding).
It is configured.

In the above configuration, among the information in the circulating storage device 1, any of the information taken into the buffer storage devices BF, to BF7 is “
If it is “1” (of course, it is the same even if all “1”)
, flip-flop FF, is set, BF, ~BF
If the information captured in 7 is all "0" (blank area), FF is not set, and if FF is set, printing is required and the paper is not fed after printing. If FF is not set, printing is not necessary and only paper feeding is performed.

As explained above, this invention reduces printing time and efficiency.

This has advantages such as preventing the IJ printer from performing unnecessary operations. In this embodiment, a 7-dot sequential type has been described, but it goes without saying that there are various modifications in implementing the present invention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing an example of printing using the printer device of the present invention, in which 1 is a circular storage device, G. ~G9 is a gate, 2 is a decoder circuit, BF, ~BF7 is a buffer storage device "A, ~A
7 is a driver, FF, a flip-flop, and 3 is a printer. Figure 1 Figure 2

Claims (1)

[Claims] 1. A plurality of buffer storage devices for temporarily storing output from a cyclic storage device used for displaying information on the screen of a display device, provided corresponding to each of the buffer storage devices, the cyclic storage device a gate circuit for selectively inputting the output of the circuit to the buffer storage device, a decoder circuit that detects what is output from the circular storage device and sequentially controls the gate circuit; is edited and stored in the plurality of buffer storage devices in accordance with the printing operation, and means is provided for monitoring the contents of the circular storage device while inputting to each buffer storage device,
A printer that determines whether or not printing is necessary, and if printing is not necessary, only feeds the paper, and if printing is necessary, sequentially retrieves and prints the output edited and stored in the plurality of buffer storage devices mentioned above. Device.