JPS60588A - Control system of copying machine - Google Patents

Abstract

PURPOSE:To make a fast display scan without altering a screen hard copying device greatly by providing a signal conversion part between a CRT display device and the screen hard copying device. CONSTITUTION:Data is read out of the video memory 3 of the CRT display device 1 with the timing clock 7 from a timing control part 4 and applied to a shift register 5, the video signal 12 from which is applied to the CRT unit 6 and signal conversion part 16. The 2nd video signal 17 and the 2nd clock signal 18 from this conversion part 16 are inputted to the sampling control circuit 7 of the screen hard copying device 2 and a horizontal and a vertical synchronizing signal 14 and 15 are applied to the paper feeding control part 8 of the device 2. Then, the conversion part 16 is provided with a means which divides the frequency of a timing signal generated by an FF circuit and a means which latches adjacent bits of the high order and low order bits of the output of the register 5, and the signals 17 and 18 are outputted respectively to make a fast display scan without altering the device 2 greatly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a control method for a copying device, and particularly to a control method for a copying device suitable for making a hard copy of the screen of a CRT display device that performs high-speed display scanning. It is.

[Background of the invention]

FIG. 1 is a block diagram showing an example of a conventional CRT display device and a screen hard copy device. In the figure, 1 is a CRT display device, and 2 is a screen hard copy device. C
The RT display device 1 receives a screen memory 3, a timing control unit 4 connected to the screen memory 3, a shift register 5 that stores the output of the timing control unit 4, and a video signal 12 that is the output of the shift register 5. It consists of a CRT unit 6. A clock signal 13 sent from the timing control section 4 is connected to the shift register 5, and a horizontal synchronization signal 14 and a vertical synchronization signal 15 sent from the timing control section 4 are connected to the video signal 12.
It is also connected to the CRT unit 6.

The screen hard copy device 2 is connected to the CRT display device 1, and the shift register 5 of the CRT display device 1 is connected to the CRT display device 1.
It is comprised of a sampling control section 7 to which a video signal 12 which is the output of is input, a paper feed control section 8, a print head 10, etc. The sampling control section 7 and the paper feed control section 8 are supplied with the clock signal 1 of the CRT display device 1.
3. It is configured such that a horizontal synchronizing signal 14 and a vertical synchronizing signal 15 are input. Further, the output of the sampling control section 7 is connected to a shift register 9, and the output of the shift register 9 is connected to the print head 1°. The output of the paper feed control section 8 is connected to a pulse motor 11.

The conventional CRT screen hard copy device 2 configured as described above operates by receiving the same signal as the signal sent to the CRT unit 6 of the CRT display device 1.
There is a problem that when the display scanning speed of the T display device 1 increases, it becomes impossible to follow this speed.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in conventional CRT screen hard copy devices and to significantly change the conventional CRT screen hard copy devices. It is an object of the present invention to provide a control method for a copying apparatus suitable for making a hard copy of the screen of a CRT display device that performs high-speed display scanning without any problems.

[Summary of the invention]

The main point of the present invention is to use a CRT that sequentially sends and prints data read from a screen memory using a shift timing signal.
a first means for setting data read from the screen memory in a hard copy device for a screen of a display device;
a second means for dividing the frequency of the shift timing signal of the first means; and a third means for latching the bit set earliest in the first means and at least its upper adjacent bit.
latching at least the two bits with the shift timing signal frequency-divided by the second means;
The point is that the focus is controlled so as to be sent to the bar 1 to the copying device.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing the main parts of a CRT display device and a screen hard copy device which are one embodiment of the present invention.

In FIG. 2, symbols 1 to 15 indicate the same components as shown in FIG. 1, and 16 indicates a signal converter. Further, 17 indicates a second video signal whose transmission rate has been reduced to 172 in the signal converter 16, and 18 indicates a second clock signal whose period has been reduced to 1/2 in the signal converter 16.

The screen memory 3 is connected to a timing control section 4, and its output is connected to a shift register 5.

The video signal 12 which is the output of the shift register 5 is transferred to a CRT.
It is connected to the unit 6 and the signal converter 16. A clock signal 13 from the timing control section 4 is connected to the shift register 5, and the clock signal 13 is connected to the shift register 5.
3 is also connected to the signal converter 16. Further, the horizontal synchronization signal 14 and vertical synchronization signal 15 from the timing control section 4 are connected to the CRT unit 6 of the CRT display device 1 and the screen hard copy device 2.

FIG. 3 shows a detailed configuration of the signal conversion section 16, and symbols 20 to 22 indicate flip-flops. In this signal conversion section 16.

The output of the screen memory 3 is connected to a shift register 5 and is configured to be shifted by a clock signal 13. Adjacent bits are connected to flip-flops 21.

Said clock signal 13 is also connected to a flip-flop 22, the output of which is connected to the trigger input of said flip-flop 20.21. The output of the flip-flop 20.2 is the second
The output of the flip-flop 22 is sent as the video signal 17 and the second clock signal 18 to the screen hard copy device 2.

In the screen hard copy device 2, as shown in FIG. 2, the second video signal 17 sent from the signal converter 16 is
is connected to the sampling control section 7, and also receives a second clock signal 18 sent from the signal conversion section 16 and a horizontal synchronization signal 14 sent from the timing control section 4.
．． A vertical synchronization signal 15 is connected to the sampling control section 7 and the paper feed control section 8. Furthermore, the output of the sampling control section 7 is connected to the register 9 to shift 1.
The output of the shift register 9 is connected to a print head 10. The output of the paper feed control section 8 is connected to a pulse motor 11.

The operation of this embodiment configured as described above will be explained below.

According to the memory address sent from the timing control section 4, data read from the screen memory 3 is set in the shift register 5. The shift register 5 performs a shift operation in response to a clock signal 13 sent from the timing control section 4, and its output, a video signal 12, is sent to a CRT unit 6 to create a display image. In addition, CRT
The unit 6 controls display scanning lines using a horizontal synchronization signal 14 and a vertical synchronization signal 15 sent from the timing control section 4.

In the signal conversion section 16, the transmission speed is reduced to 1/2 by the operation shown in FIG. Second video signals 17 and 1
A second clock signal 18 whose period is reduced to ]/2 is created. This will be explained in detail below.

In FIG. 3, the data read from the one-screen memory 3 and set in the shift register 5 is shifted one by one by a clock signal 13.

The LSB of the shift register 5 and its 2nd focus to the adjacent pin 1 in the 2nd position direction are transferred to the flip-flop 22.
The second clock signal 18 whose frequency is divided by 1/2 by 1-
As a trigger, flip-flops 2° and 21 are connected to cellar 1.

FIG. 4(A) shows the timing relationship between the horizontal synchronizing signal 14 and the video signal 12 sent to the CRT unit 1-6. First, the video signal of the 0th raster of the topmost scanning line on the screen is 0.1, 2, . . . N, ] are sent one tod at a time. Next, the video signal of the first rask is similarly sent one dot at a time. In addition.

In this figure, the screen has N dots in the horizontal direction and M dots 1 to 1 in the vertical direction.

Further, FIG. 4(B) shows the timing relationship between the horizontal synchronizing signal 14 and the second video signal 17 sent to the screen hard copy device 2. In the O-th raster, 2 bits of 0.1 of the video signal are sent simultaneously, and the 2nd bit of the video signal is sent first.
, 3 are sent simultaneously. Similarly, the horizontal video signal is sent two dots at a time.

Since the screen hard copy device 2 only has to operate by receiving the video signal sent two dots at a time at the low speed, even if the display scanning speed of the CRT display device 1 becomes faster, it can follow this.

In the above embodiment, an example was shown in which the shift timing of the shift register 5 is divided into 1/2, but it goes without saying that the present invention is not limited to this.

〔Effect of the invention〕

As described above, according to one aspect of the present invention, in a hard copy device for the screen of a CRT display device that sequentially sends and prints data read from a screen memory using a shift 1 timing signal, the data read from the screen memory is set. a first means; a second means for dividing the shift timing signal of the first means; Since a third latching means is provided, at least the two bits are latched by the frequency-divided shift 1 timing signal sent to the second means, and these bits are sent to the hard copy device. This has the remarkable effect of realizing a control system for a copying apparatus suitable for making a hard copy of the screen of a CRT display device that performs display scanning.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional CRT display device and screen hard copy device, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram showing the detailed structure of a signal converter. The block diagram and FIG. 4 are timing charts 1- showing the operation of the embodiment. 1: CRT display device, 2: Screen hard copy device, 3;
Screen memory, 4: Timing control section, 5: Shift register, 6: CRT unit 1-17: Sampling control section, 8: Paper feed control section, 9: Shift register, 10: Print head, 11: Pulse motor, 12: Video signal, 13
: clock signal, 14: horizontal synchronization signal, 15: vertical synchronization signal, 16: signal converter, 17: second video signal, 18:
Second clock signal. Figure 1, 1 Figure 2 ■ Figure 3 Figure 3 Figure 4 (A)

Claims (1)

[Claims] A hard copy device for the screen of a CRT display device that sequentially sends and prints data read from a screen memory using a shift timing signal, comprising: a first means for setting the data read from the screen memory; and a shift of the first means. a second means for frequency dividing the timing signal;
a third means for latching the bit set earliest in the means and at least its upper adjacent bit;
A control method for a copying device, characterized in that at least the two bits are latched using a shift timing signal frequency-divided by the second means, and control is performed such that these bits are sent to the hard copying device.