JPS5987573A - Video controlling system in printing device - Google Patents

Abstract

PURPOSE:To secure a refresh operation for a fixed period by prescribing an operating state of a video gate range setting means in accordance with a printing position, in a printing device of a raster scan system. CONSTITUTION:When a range of B-C is printed in a printing form, when printing is executed up to C, a video gate is dropped and refresh is started. When an adjusting allowance B-B' exists, a video gate signal is reduced to tl', a counter is preset to tn, and when tn+tl'=T is counted, a fly-back control to the following line is executed by outputting a signal, and also refresh of a CG memory is executed. In this way, a refresh time of the CG memory can be held exactly irrespective of whether the adjusting allowance exists or not, and whether it is large or small, and even if the CG memory is constituted of a dynamic memory, its contents are not varied.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video control method in a printing device, and in particular, in a raster scan type printing device equipped with an adjustment function for adjusting the print position, the present invention relates to a video control method for adjusting the print position and moving the print position after the start position. OG even when backing up towards Ti
1r view of video control system technology that ensures sufficient memory refresh time, conventional technology and problems Raster scan type printers use a character generator (hereinafter referred to as CG) to generate character patterns. I am using it. Dynamic memory is used as the memory for this CG, and although this has advantages such as being cheaper and consuming less power than static memory, it requires refreshing. For this reason, conventional low-speed printers can be refreshed by reading one character from the CG. However, in laser printers that print using the scanning method, there is no time to refresh each character read from the CG because they print at high speed.
Refreshing to the end area within the scan time.

That is, as shown in FIG. 1, data for one scan is output from the OG memory by the scan synchronization signal of one period tp, but this one period tp is used for reading and writing to the OG memory.
The same figure (b) becomes an enable signal.

(The video gate 1 word of C1 and the refresh gate signal will be generated. The first video gate signal period tX is the video area for printing, and the final refresh gate signal period tr is A so-called flyback area in a raster scan type line printer is an area not involved in printing (hereinafter referred to as a blanking area), and is used for 11 refreshes for the OG memory constituted by the dynamic memory.

However, when printing, even when printing is performed by moving the first printing start device of one line to a position later than the normal position to allow for adjustment, conventionally the output period of the video signal is the same period t1 as in the case without this adjustment allowance. It is. In other words, Figure 1 (
As shown by, 71! for the adjustment fee! a Even if the video gate signal is output for the margin time in, its duration is tλ. Therefore, as shown by the shaded area in FIG. 1 tct, the video gate signal and the refresh fist gate signal differ by this adjustment time tn.

However, since the CG memory is being read for printing while the video gate signal is on, the refresh operation of the OG memory is blocked, resulting in the contents of the CG memory being corrupted.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the problem that the video gate signal and the refresh gate signal overlap in such a manner that there is an adjustment margin, and as a result, the refresh operation is delayed. The video control system for the printing device is designed to terminate the video gate signal when it exceeds tn, so that even if the adjustment time tn becomes longer, the refresh operation by the refresh gate signal is guaranteed only for a certain period of time. It is to provide.

Structure of the Invention In order to achieve this object, the printing apparatus of the present invention has a Pideme control system, which comprises a character pattern storage section for storing character patterns, and a print position adjustment means for adjusting the print position, and the character pattern storage section has The printer comprises a memory that must be refreshed and prints the character pattern output from the character pattern storage part using a rask scan method, and a video gate range increase means for setting the video gate range. , a video start signal generating means for instructing video start, and a video gate signal generating means for generating a video gate signal; It is characterized in that V is set so as to define the operating state of.

Embodiment of the Invention Before describing the present invention in detail based on one embodiment, its outline will be briefly explained with reference to the second drawing.

As shown in FIG. 2, when the printable range on the printing paper is from A to 0, printing is normally performed in the range from B to 0. At this time β. The flyback area from the end of the shot until the transition to 21 is a blanking area, and the CG memory is refreshed during this period. When printing in the range B' to C as shown in Figure 2 (b), that is, B-B
'If the interval is rA, when up to C is printed for the mu, flyback is performed to print the next page. In this invention, as shown in FIG. 2 (-1), when IJ and O are printed, the video gate signal is dropped and refresh is started as a blanking area. In other words, when there is an adjustment margin B - B' video gate signal t2'
It decreases. For this purpose, for example, a counter may be provided to eliminate the adjustment allowance 13-B' as shown in FIG. 2(A). When printing , set tA in Figure 2 to count 6℃ as soon as the video starts, and set th+tμ=T(
When counting AO), it outputs a signal to perform flyback control for the next line, refresh the OG memory, and print with an adjustment allowance of B-13' in Fig. In this case, preset the counter in t and l in Figure 2 (c), and when the video starts, tL' is counted, and when tn, -) tλ' = i' (AO) is B1 number, No. 44 is output and the next Flyback control is performed for the row of , and the CG memory is refreshed. As a result, the refresh time of the OG memory can be maintained accurately regardless of the presence or absence of an adjustment margin and its magnitude, and even if the O'G memory is configured with a dynamic memory, its contents will not change.

An embodiment of the present invention will be described below based on @Fig. 3 and Fig. 4.
This will be explained with reference to other figures.

FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the operation.

In the figure, lO is a register for setting printing position 1i1\lil+JV data, 11 is a video gate range calculation circuit,
12 is a print position adjustment counter, 13 is a video counter,
14 is a video control shift register.

The register 10 is a register in which print position tone 1 data indicating the print start position of each line on the paper is set. For example, as shown in Figure 2 (A), when the printable range on the paper is A to 0, the printing start position of each line is B, and the value (for example, number of digits) between AB and DB is set. do. Also, n1' as an adjustment allowance? 7 If you want to lower it than this person, set I) 1L.

The video gate range OA calculating circuit 11 calculates the corresponding print driver) M from the print position adjustment data set in the register 10, and outputs this as a reset (direct Llp) of the video counter 13.

The print position adjustment counter 12 calculates a print start position corresponding to the print position adjustment data set in the register 10, and outputs a video start signal Vs.

The video counter 13 counts the number of printed dots, and outputs a carry when the number of printed dots in the printable range A to 0 in FIG. 2(a) is counted. This video counter 13 is preset to number 11 (preset value Dp) transmitted from the video gate range performance 1 circuit 11.

As shown in FIG. 4(a), the video control shift register 14 outputs a beam off (1) signal from the video control register 1 when the scanning amount 1υj signal is applied, and also outputs a beam off (1) signal from the print position adjustment counter 12. In response to the video start signal Vs transmitted from the video control register (2), the video control register (2) outputs the first video on signal, that is, the video gate signal VG. When a carry is applied from the video counter 13, this video gate signal vO is turned off, and a beam off (2) signal (hereinafter referred to as a refresh signal) which acts as a refresh/patroll signal is outputted from the video control register (2). For the sake of simplicity, FIG. 2 shows the video gate signal V as its output.
Only G is shown.

Next, this operation will be explained.

(1) In the case of normal printing In the case of normal printing in which printing is performed from position B on the paper as shown in FIG.
Set the number of digits between A and 13 J)B as position adjustment data. As a result, the video gate range calculation circuit 11 calculates the number of printed dots corresponding to this digit number 1)11, outputs this as a preset value 1)p, and presets the video counter.

Now, when the scanning synchronization signal is applied to the print position adjustment counter 12 and the video control shift register 14, the video control shift register 14 turns off the beam (1) from the video control register (2) as shown in No. 41N (a). Output a signal. Further, the printing position adjustment counter 12 starts a counting operation by applying this scanning synchronization signal, and when it has pulse-counted the period tk in FIG. Output from register 141C. This allows video control shifts.

The gate register 14 outputs a video gate signal VG as shown in the video control shift register (2) in FIG. 4(a). And this accesses the OG memory,
The printability pattern is read out for the 111th time on the paper, and the printing operation is performed.

Furthermore, since the video start signal Vs is also applied to the video counter 13, the video counter 13 also operates. Then print dots fil on the paper up to the printing range 0.
When E is counted, a carry signal is outputted as shown in FIG. As a result, the video control shift register
As shown in IN (a), the video gate signal VG is dropped and a refresh signal is output from the video control shift register (2). As a result, the OG memory performs a refresh operation until the next periodic signal. This kind of thing is repeated, and as shown in the 21st block (a), 13
Printing will be performed sequentially in the range from 0 to 0.

(2) When adjusting the print position As shown in Figure 2 (b), when printing from position B' on the paper, set the number of digits Dn/ between A and B' in register lO as print position adjustment data. do. As a result, the video gate range calculation circuit 11 calculates the number of printed dots corresponding to the number of digits Dn/, and presets this in the video counter 13.

Then, when the scanning synchronization signal is applied to the print position adjustment counter 12 and the video system (ii1 shift register 14), the beam off (1) signal is output from the video control register (1) as in the case (1) above. By applying this scanning synchronization signal, the counter 12 starts the operation of p711, and this time period 1 of Fig. 2 (c) is applied.
When the pulse count of u is counted, a video start signal Vs is output. This causes the video controller 111 shift register 1
As shown in the video control shift register (2) of the 41st Jlf port (4), the video gate signal VC is output, the CG memory is accessed, and the printing operation is performed from the first row 8' of the sheet.

This video start signal Vs is also applied to the video counter 13.
is applied, so that the video counter 13 also operates. When the number of printed dots E up to the printing range C on the paper is counted, a carry signal is outputted and applied to the video control shift register 14, as shown in FIG. As a result, as shown in FIG. 4(b), the video control shift register (2) drops the video gate signal VG, and a refresh signal is output from the video control shift register (2).

In other words, even if the pressure and printing start position is obtained at position B' as shown in FIG.
1) p of the video counter 13 is changed, the time for the video counter 13 to output a carry becomes constant, and therefore the CG memory is refreshed 1/1).
The refresh gate signal and the video gate signal for sending data are never in sync. Soh:1lj(, No matter where the print start positions i and l'j are set, the CO memory can be refreshed and the refresh operation can always be performed at a certain position and for a certain period of time from the synchronization signal.

Effects of the Invention According to the present invention, a video gate range setting means such as a video counter is provided, and the output signal generation point thereof is controlled according to the print start position, so that the video gate signal can be controlled regardless of the print start position. By setting 5"Ut constant, the refresh start point of the OG memory and its refresh period can be secured as required. Therefore, the print start position is changed due to the adjustment allowance. Also OG
Changes in the contents of memory can be erased by extremely simple means.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the operation of the conventional video opening side 1 system, Fig. 2 is a schematic explanatory diagram of the present invention, Fig. 3 is a configuration diagram of an embodiment of the present invention, and Fig. 4 is an explanatory diagram of the operation of the present invention. It is. In the figure, 10 is a register, 11 is a video gate range calculation circuit, 12 is a print position adjustment counter, 13 is a video counter, and 14 is a video control shift register. Patent applicant: Hasushi Tsu Co., Ltd. (1 other person) Representative patent attorney: Akira Yamatani

Claims (1)

[Claims] It has a character pattern storage section for storing character patterns and a print position adjustment means for adjusting the print position, and the character pattern storage section is constituted by a memory that needs to be refreshed, and the character pattern outputted from the character pattern storage section is In a printing device that prints using the raster scan method, a video number gate range setting means for setting a video gate range, a video start signal generation means for instructing video start, and a video gate signal generation means for generating a video gate signal. A video control system for a printing device, characterized in that the operating state of the video gate range setting means (i11) is defined in accordance with the instruction of the printing position.