JPH0647286B2 - Image area ratio-ink key opening conversion characteristic display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ink feed amount adjusting device for an ink fountain in a printing machine, and in particular, an ink key opening display for adjusting a fountain screw by using pattern area ratio data recorded on a magnetic card. The present invention relates to a device for visually displaying a conversion function characteristic of a function circuit for converting a pattern area ratio into an ink key opening.

Background Art In a printing machine, the tip of the ink delivery adjustment plate that contacts the fountain roller is advanced and retracted by adjusting the many fountain screws that are arranged along the lengthwise direction of the adjustment plate, and the amount of ink sent out from the ink fountain is adjusted. I am trying to adjust it.

To adjust the pot screw, the original to be printed is applied to, for example, a pattern area ratio measuring device disclosed in Japanese Patent Laid-Open No. 56-24508, and the pattern area ratio data corresponding to each pot screw is taken out. The ink key opening is adjusted by operating. The jar screw operation may be performed manually by an operator, or there is an automatic system in which the jar screw is driven by a motor and the motor is operated by a control device.

Here, the pattern area ratio data does not directly represent the ink key opening. Therefore, it is necessary to use a function circuit to convert the pattern area ratio into the ink key opening. In this case, the conversion characteristic of this function circuit is not necessarily fixed and it is necessary to be able to change it by adjustment, whereby a desired conversion characteristic is obtained.

However, since this adjustment is performed by operating the variable resistor, the conversion characteristic itself cannot be accurately recognized although it is roughly estimated by the operating position of the variable resistor.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points. A sawtooth wave is given to a function circuit for converting a pattern area ratio-ink key opening, and an output is taken out. This is a device for visually displaying a function characteristic by using a wave as a horizontal axis input.

With reference to FIGS. 1 to 5 below, the application target of the present invention will be described.
Next, the present invention will be described with reference to FIGS. 6 to 8 with reference to an embodiment.

The present invention advances and retracts the tip of the ink fountain adjusting plate in contact with the fountain roller by a large number of ink fountain adjusting bodies arranged along the lengthwise direction of the adjusting plate, so that the amount of ink ejected from the ink fountain is increased. It is effective when applied to a printing machine provided with an inking device for adjustment, and an example of the inking device is shown in the right side of FIG. 1 and FIG.

That is, in the figure, 10 is a fountain roller, 12 is a doctor blade as an adjusting plate, and 14 is an ink adjusting screw as an ink fountain adjusting body. Ink fountain is fountain roller 10 and doctor blade
Formed between 12 and. The doctor blade has a one-piece structure or a structure in which each of the screws is divided. Reference numeral 13 is a calling roller for taking out ink from the fountain roller, and 16 is an ink kneading roller group.

Then, the ink is stored in the space formed by the fountain roller 10 and the blade 12, and as the fountain roller rotates, the amount of ink corresponding to the gap 18 between the tip of the blade and the fountain roller is increased. Supplied on the surface of. The tip of the screw 14 that contacts the back side of the blade 12 moves in and out by adjustment, whereby the tip of the blade is displaced and the gap 18 is opened and closed. Ink on the fountain roller is grouped with an ink kneading roller group by the calling roller 14.
Then, it is transferred to 16 and then transferred from an inking roller (not shown) to the pattern portion of the plate on the plate cylinder and printed on the printing paper.

The ink density of printed matter is determined by the ink supply amount,
When the ink supply amount is increased, the ink density becomes dark, and when the ink supply amount is decreased, the ink density becomes light.

To adjust the ink fountain adjuster, (I) step of measuring the pattern area ratio of the printing plate prior to printing, (II) based on the information of the pattern area ratio, each in the vicinity of the ink fountain adjuster Step for electrically displaying the adjustment position of the adjustment body, (III)
According to the display of the adjustment position, the step of operating each ink fountain adjuster is performed.

Next, each step will be described.

(I) Measurement of the pattern area ratio of the printing plate In FIG. 1, 20 is a printing plate pattern area ratio meter, which is equipped with a magnetic card reader, for example, as a data output device, and the pattern area ratio of the printing plate 22 is determined by each ink. The measurement is performed for each ink supply area of the pot adjustment body, and the magnetic card reader 24 outputs the measured data, that is, the magnetic card 26 in which the preset data is recorded.

In addition to the method of obtaining the pattern area ratio information from the printing plate 22, a known method such as a film original plate or a method of obtaining it from a proof print may be used.

Further, as a medium for inputting / outputting the pattern area ratio information, in addition to a system using a magnetic card, a known one such as a magnetic tape, a paper tape, a paper card, a semiconductor memory element can be used. If four-color printing is performed in this step, a total of four magnetic cards will be obtained.

(II) Display of Adjustment Position In FIG. 1, 28 is an ink fountain adjuster position display output conversion device.

The conversion device 28 is connected to a printing press via a signal transmission line as shown in FIG.
A signal given from 28 is used to display on the position indicator 52 provided for each pot screw. The position indicator 52 is configured to display the ink key opening degree in a bar graph, and the position indicator elements for each urn screw are arranged side by side, so that the ink key opening degree for each urn screw can be seen at a glance. Can be recognized.

And on the right side of each position indicator 52, the pot screw operation knob 14
A pointer 14b which moves up and down according to the rotation of a is juxtaposed.
Therefore, aim the display position of the position indicator 52
14a is rotated to move the pointer 14b up and down so that the display position of the position indicator 52 and the display position of the pointer 14b coincide with each other. As a result, the tip of the blade 12 is displaced and desired ink supply is performed.

On the other hand, as shown in FIG. 3, the configuration of the conversion device 28 is such that the input unit 30 of the magnetic card 26, the I / O port 32, and the CPU 34.
And ROM 36 and RAM 38 as storage devices, and DMA (Direct Memory Access) that operates by receiving commands from the CPU
Control unit 40 and D for converting the output from RAM to analog
A / A converter 42 and a function circuit 44 for adjusting the output of the D / A converter
It is equipped with an I / O port (input / output control unit) 32 and a CPU 34,
The ROM 36 and the RAM 38 are connected to each other by a bus 46.

Next, the operation will be described.

The four magnetic cards 26 obtained in (I) above are the operators 48
Thus, when sequentially inserted from the input section 30, the data read by the magnetic head of the input section is sequentially stored in the memory via the CPU 34. At this time, the picture area ratio data corresponding to one key of the ink fountain is recorded on the magnetic card at 3 bytes, but the display of the below-mentioned display is in 20 to 30 stages, and the data of 3 bytes is not necessary and 1 byte. The data compression from 3 bytes to 1 byte is performed by the CPU and stored in the memory because it is sufficient. When the input of all color magnetic cards and the storage in the memory are completed, the CPU 34 outputs a start signal to the DMA control unit 40 and opens the system bus 46. DMA
When the control unit 40 receives the start signal, the control unit 40 starts address designation for reading data from the memory. The data of the specified address is output from the memory 38 to the D / A converter 42 and the D / A
It is converted into an analog signal by the converter. This analog signal is further input to the function circuit 44 and data-converted according to a preset pattern area-urn opening conversion function,
It is output to the ink display device in the pot.

As shown in FIG. 4, the conversion function held in the function circuit 44 is a function representing the relationship between the horizontal axis as the input, that is, the image area ratio, and the vertical axis as the output, that is, the adjustment position of the ink fountain adjuster. is there.

As shown in FIG. 5, the ink display device of the pot part has an analog switch 50 (a switch that can realize a switch with only a semiconductor without mechanical contacts, and can control the position of the switch by an electric signal. It is marketed as an IC) and a position display body 52 corresponding to the number of keys in the ink fountain and its drive circuit 54. The signal input to the ink display device is transmitted to the position indicator drive circuit 54 of one ink fountain adjuster through the analog switch 50, and the position is displayed according to the input signal. At this time, the position of the switch of the analog switch is synchronized with the address designation of the memory, and when a certain address is designated, the switch is positioned on the ink fountain adjuster corresponding to it.

When the address is specified, the data becomes an analog signal, and when the position is finally displayed on the pot, the address is automatically changed to the next address, and the position of the analog switch is automatically changed to the corresponding position. change. In this way
The designated addresses change in sequence, and once all the addresses in the memory have been designated, the first address designation is restored and the same control is repeated.

(III) Operation of the ink fountain adjuster The ink fountain adjuster 14 follows the indication of the position indicator 52,
Operated by operator 48.

Embodiment Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 6 shows the basic configuration of the device of the present invention, in which the upper side of the alternate long and short dash line shows the elements in the conversion device 28 and the lower side of the alternate long and short dash line shows the side of the display device for visually displaying the functional characteristics of the function circuit 44. Shows the elements of.

In the converter 28, the switch is connected to the input side of the function circuit 44.
SW ₁ is provided so as to selectively take in the output of the D / A converter 42 and the sawtooth wave from the display device, and correspondingly, the switch SW ₂ is provided on the output side of the function circuit 44 to The output of the circuit 44 is applied to a signal transmission line for position indication or to a display device. However, switch SW ₂ can be omitted.

In addition to this, the display device is between the conversion device 28 and the conversion device 28.
From the switch S depending on the presence or absence of the signal of the converter operation.
It has a circuit configuration for switching between W ₁ and SW _2, and a circuit configuration for giving a sawtooth wave to each switch SW ₁ of a plurality of function circuits 44 provided to take out a signal from each switch SW ₂ .

The internal structure of the display device is a display switch 62, an inhibition gate 60 for switching the switches SW ₁ and SW ₂ based on the output of the display switch 62 and a signal of the converter operation, and a sawtooth shape to be given to the function circuit 44. It has a sawtooth wave generator 64 for generating a wave, a selection switch 66 for selecting and extracting the signal from the function circuit 44, and a CRT 68 for visually displaying the extracted function characteristic.

FIG. 7 shows the signal waveform of each part of the circuit of FIG. 6, and the circuit operation of FIG. 6 will be described with reference to this FIG.

The conversion device 28 is not operating now and the display switch 62 is ON.
Then, the inhibition gate 60 produces an output, and the switches SW ₁ and SW ₂ are switched to the solid line side in the figure. As a result, the sawtooth wave (a) which is the output of the sawtooth wave generator 64 is output to the functional circuit via the switch SW _1.
44 and its output is provided to the vertical input of CRT 68 via switch SW ₂ and select switch 66. This waveform is a sawtooth wave by the function circuit 44 as shown in FIG. 7 (b).
(a) is the waveform converted.

The sawtooth wave from the sawtooth wave generator 64 is applied to the horizontal axis input of the CRT68, and the beam generation electrodes of the CRT68 are synchronized with the rising and falling edges of the sawtooth wave from the sawtooth wave generator 64. A rectangular wave that rises and falls is given. Therefore,
Only the function characteristic curve of the function circuit 44 is displayed on the screen of the CRT 68. That is, the output of the function circuit 44 includes the O level portion as shown in FIG. 7B, but the O level portion is not displayed on the screen of the CRT 68 because the beam of the CRT 68 is not generated.

On the other hand, the display switch 62 is turned off or the conversion device 2
When the switch 8 operates, the inhibition gate 60 does not produce an output, so that the switches SW ₁ and SW ₂ of the conversion device 28 are connected to the positions indicated by the broken lines in the figure, and the display device is disconnected from the conversion device 28. Therefore, the conversion device 28 displays the original ink key opening degree.

FIG. 8 shows another configuration example of the present invention.
When the 28 function characteristics are changed, the function characteristics before the change and those after the change are simultaneously displayed, which is different from the one shown in FIG.

Therefore, the waveform before change is stored, a waveform storage memory 72 is provided, the function characteristic data digitally changed by the A / D converter 70 is given to the memory 72, and then stored.
The stored contents of the memory 72 are read out via the D / A converter 74 and displayed on the oscilloscope Ch2. In order to store and read data in this memory 72, the address counter 76, W /
An R control 78, a timing oscillator 80 and a memory switch 82 are provided.

The conversion device 28 is not operating now and the display switch 62 is ON.
The operation will be described as follows. First, in order to store the waveform, the storage switch 82 is turned on and the W / R control 78 gives a write command to the waveform storage memory 72. This causes the waveform storage memory 72 to perform a storage operation. And A / D converter 7
The function characteristic data given through 0 is sequentially written in the address of the memory 72 which is determined according to the output of the address counter 76 based on the clock from the timing oscillator 80. Next, when the memory switch 82 is turned off, the W / R control 78 gives a read command to the memory 72, and the output of the memory 72 is given to the oscilloscope Ch2 via the D / A converter 74 and displayed. This display is the waveform before the characteristic change.

Then change the function characteristics of the function circuit 44 to change the oscilloscope
The changed waveform is displayed on Ch1. By comparing the display waveform of this oscilloscope Ch1 with the display waveform of the same Ch2, it is possible to clearly see how the waveform changed. For the oscilloscopes Ch1 and Ch2, it is convenient to use a two-phenomenon oscilloscope.

As described above, the present invention provides a visual display of the functional characteristics of a function circuit that converts the pattern area ratio data into the ink key opening in the ink feed amount adjusting device that adjusts the ink key opening based on the pattern area ratio data. Therefore, the conversion function characteristic of the function circuit can be clearly recognized, and the operation for obtaining the desired conversion characteristic can be performed accurately.

Further, by displaying the characteristic before the change and the characteristic after the change at the same time, the degree of the change can be more clearly grasped when the characteristic is changed.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an ink feed amount adjusting work according to the present invention, FIG. 2 is an enlarged view of the periphery of a printing machine in FIG. 1, and FIGS. 3 and 5 are conversions of FIG. A block diagram showing the internal configuration of the apparatus, FIG. 4 is a characteristic diagram showing the relationship between the pattern area ratio and the ink key opening (adjustment position of the ink fountain adjustment body), and FIG. 6 is a block diagram showing one configuration example of the present invention. 6 is a waveform diagram of each part of the circuit of FIG. 6, and FIG. 8 is a block diagram of another configuration example of the present invention. 10 …… Fountain roller, 12 …… Ink fountain adjustment plate, 14 …… Ink fountain adjuster, 20 …… Plate plate pattern area ratio meter, 22 …… Plate, 26
...... Magnetic card, 28 ...... Ink fountain adjustment body position display output conversion device, 52 ...... Position display body, 60 ...... Prohibition gate, 68 ......
CRT, SW ₁ , SW ₂ ...... Switch.

Claims (4)

[Claims] 1. A function characteristic for obtaining pattern area ratio data recorded on a recording medium and converting it into ink key opening data,
A function circuit capable of changing the function characteristics, a sawtooth wave generation circuit for generating a sawtooth wave, and provided at at least one of the input and output ends of the function circuit, the pattern area ratio data for the function circuit. Instead, a switch for giving the sawtooth wave and taking out its output, and the output of the function circuit when the sawtooth wave is given to the function circuit via this switch is used as the vertical axis input, and the sawtooth wave is used. Is given as a horizontal axis input to display the function characteristic in order to change the function characteristic of the function circuit. 2. A function characteristic for obtaining pattern area ratio data recorded on a recording medium and converting it into ink key opening data,
A function circuit capable of changing the function characteristics, a sawtooth wave generator for generating a sawtooth wave, and provided at at least one of an input end and an output end of the function circuit, the pattern area ratio data for the function circuit. Instead, a switch for giving the sawtooth wave and taking out its output, a waveform storage memory for storing the output of the function circuit when the sawtooth wave is given to the function circuit via the switch, and this memory And the output of the function circuit when the sawtooth wave is applied to the function circuit are given as vertical axis inputs and the sawtooth wave is given as horizontal axis input, thereby displaying two waveforms. By comparison, a display device for converting the image area ratio-ink key opening degree, which is provided with a display device for changing one of the function characteristics. 3. The device according to claim 1 or 2, wherein a pair of switches are provided at the input and output ends of the function circuit, and the pair of switches are interlocked with each other. Ink key opening conversion characteristic display device. 4. The device according to claim 1 or 2, wherein the display device performs luminance modulation in synchronization with the sawtooth wave, and is a device for displaying a pattern area ratio-ink key opening characteristic. .