KR100613007B1 - Device For Controlling The Compress Of Digital Printing Machine - Google Patents

Abstract

The present invention relates to a head pressure control apparatus of a digital printing machine, and more particularly, in a vacuum ejector of a vacuum line in a state in which pressure generated in a compressor is removed from water in a plurality of air filters and pressure is reduced in a plurality of regulators. It is very useful and effective to supply the ink uniformly and continuously with constant pressure to the head because it is selected and supplied to the auxiliary ink tank by adjusting the first and second purge valves by switching to negative pressure or switching to positive pressure in the purge line. It relates to the invention.

Pressure generation and control means Pressure drop means Ink pressure control means Vacuum ejector

Description

Head Pressure Control Device of Digital Printing Machine {Device For Controlling The Compress Of Digital Printing Machine}             

1 is a perspective view of main parts of a conventional digital printing machine,

2 is an exploded perspective view showing the head of FIG. 1;

3 is a perspective view of a digital printing machine installed with a head pressure device according to the present invention;

4 is a view showing a configuration state of the head pressure device according to the present invention,

5 is an enlarged view of the ink pressure adjusting stage according to the present invention;

Figure 6 is an enlarged view of the main portion of the head pressure device according to the present invention,

7 is a view showing a state of use of the head pressure device according to the present invention.

* Description of the symbols for the main parts of the drawings *

7: head portion 9: cartridge

20: conveying belt 40: conveying support member

54: ink pump 58: ink filter

70: auxiliary ink container 72: three-way valve

80: pressure generating and regulating means 82: compressor

84: first air filter 86: the first regulator

88: air tank 90: pressure control means

92: pressure control switch 96: safety valve

100: moisture and pressure control means 102: second air filter

104: second regulator 110: pressure supply means

112: first solenoid valve 114: vacuum line

116: vacuum regulator 118: vacuum ejector

120: second solenoid valve 122: purge regulator

124: Purge line 126: auxiliary air tank

130: digital gauge 132: manual button

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital printing machine, and in particular, a pressure generated in a compressor is converted to a negative pressure in a vacuum ejector of a vacuum line in a state in which water is removed from a plurality of air filters and pressure is reduced in a plurality of regulators. The head control device of the digital printing machine that switches to the positive pressure at the urgeline and selects and supplies to the auxiliary ink tank by adjusting the first and second purge valves so that ink is uniformly and continuously supplied at a constant pressure to the head. will be.

In general, a digital printing machine is frequently (magenta, M), yellow (yellow, Y), cyan (cyan, C) on a head for ejecting ink by digitizing a desired output signal from a digital controller. It is the latest printing device that draws the pattern that the user wants by using the subtractive mixing technique that supplies three primary colors and paints the colors on the printing paper (messia) to create various colors.

Of course, recently, digital printing machines that display various and sophisticated colors by adding soft magnetic (light magenta, LM) and light cyan (light cyan, LC) are also used.

In order to use the above-described subtractive mixing technique, ink having each color is individually received and supplied to a head for scanning each color, so that ink of the color scanned from each head is overlaid so that a new color is exhibited.

1 is a perspective view illustrating main parts of a conventional digital printing machine, and a brief description will be made of a general structure of a conventional digital printing machine with reference to the drawing.

In the conventional digital printing machine, a rail-shaped transfer member 5 is installed on an upper portion of the base 3 supported by both legs 1 contacting the bottom surface, and the head portion 7 is attached to the transfer member 5. The cartridge 9 fixed to one side is coupled to be transportable.

The cartridge 9 is fitted to the guide rollers 10a and 10b provided at the left and right ends of the transfer table 5 and coupled to the transfer belt 20 moving left and right by driving the motor 11. It is made to be transported.

In addition, the media (media), which is printing paper, is supplied from the paper feed roller 11 installed on the rear surface of the digital printing machine to the upper surface of the base 3, and the transfer belt 20 is moved from the upper surface of the media. When the cartridge 9 is reciprocated to the left and right, the ink of the predetermined color is scanned from the head part 7 in conjunction with this, and a printing operation is performed, and the printing roller 12 is printed on the opposite side of the paper feed roller. The media will be rolled up.

The media is a term known in the art, and refers to an object for outputting the ink ejected by the head portion 7 to paper or cloth.

An operating panel 16 covered by the cover 15 is formed on one side of the base 3 so that the user can input a desired signal to print the media in a desired state.

When the media is wound on the roll roller 12, a plurality of cooling fans 18 fixed to the legs 1 are provided to dry the ink while cooling the heat.

In addition, the horizontal holding rod 30 is installed to move up and down in the guide groove installed in the guide support member 25 in order to keep the media wound around the roll roller 12.

In addition, a plurality of main ink bottles 18 are installed on one side of the leg 1 in a state of being stored in the ink case 14, and an auxiliary ink bottle 17 is provided on the opposite side of the head portion 7 of the cartridge 9. It is installed to receive the ink from the main ink container 18 to supply the ink to the head (7).

As shown in FIG. 2, the structure of the head part 7 is formed by the lower case 22 and the upper case 24, and a part of the upper case is cut off to form a wiring hole that becomes a passage for wiring. 25) is formed.

The lower case 22 has an ink jet print head 26 for ejecting ink of different colors and is fixed to the head base 28 in a diagonal direction.

The ink jet print head 26 is connected to an ink supply line 30 at an upper side thereof to supply ink stored in an outer tank to the ink jet print head 26, and an injection hole at a lower side of the ink jet print head 26. 32) is installed to eject the ink to the lower portion of the head (7).

The head portion 7 moves left and right along the transfer member 5, and the ink injected through the ink jet print heads 26 is injected onto the media to obtain a desired output.

On the other hand, the applicant has previously been registered in Korea Patent Registration No. 434174 for a device for cleaning the head to manually press the head or supplying the ink continuously.

In the above-mentioned patent, when the first digital printing machine is purchased for the first time, or after the purchase, the ink is removed and moved to another place for the first time, and the ink filled in the auxiliary ink container 17 is transferred to the head 26 through the pipe. Since it can not be passed to the artificial ink to the auxiliary ink tank 17 with a rubber air pump to push the ink to the head (26).

Once the ink is supplied to the head 26, even if the supply pressure is not applied by the piezo cyphony principle, only the atmospheric pressure always supplies ink to the head 26, and the auxiliary ink container 17 ) Is sucked into the ink from the main ink container 13 and stored.

By the way, as mentioned above, in the prior invention, the air pump is manually operated to apply pressure to the auxiliary ink container 17 to supply ink to the head 26 once, and to deliver the ink to the head 26 in an atmospheric pressure state inside the auxiliary ink container 17. Since the ink is transferred to the head 26 by the principle of the siphon, the ink is not uniformly sprayed, and thus, there is a problem in that it does not implement fine and vivid colors.

In addition, when the solution solution is supplied to the head 26 to remove the ink deposits from the head, the air pump performs the work, which is cumbersome and time-consuming.

Manual control using this siphon principle is not suitable for low-end and low-resolution low-end digital printing machines, but it has limitations to apply to high-end digital printing machines with higher specifications and higher resolution.

The present invention has been made to solve the above problems, the pressure generated in the compressor to remove the moisture in the plurality of air filters, the pressure is reduced in the vacuum ejector of the vacuum line to a negative pressure in a plurality of regulators The purpose is to ensure that ink is supplied uniformly and continuously at a constant pressure to the head because it is selected or supplied to the auxiliary ink container by adjusting the first and second purge valves by switching or switching from the purge line to the positive pressure.

The above object is an ink and solution pump for pumping and supplying the ink and the solution of the main ink container and the solution solution; An ink and solution filter for filtering the ink and the solution solution transferred to the ink and the solution pump; A digital printing machine comprising an auxiliary ink container and an auxiliary solution solution container for temporarily storing the ink and solution transferred through the ink and solution filter and continuously supplying the ink and solution to the head of the head unit, wherein the water contained in the air by generating a high pressure pressure Pressure generation and drop means for removing the pressure and lowering the pressure; Pressure control means for storing the air regulated by the pressure generating and lowering means and maintaining the pressure at an upper limit pressure and a lower limit pressure; Water and pressure drop means for repeatedly removing water from the air controlled by the pressure control means and lowering the pressure; The digital printing machine comprising a pressure supply means for converting the air supplied from the water and the pressure drop means to a negative pressure in the vacuum line or to maintain a positive pressure in the purge line to selectively control the pressure supply to the auxiliary ink container By providing a head pressure control device.

The pressure generating and dropping means includes a compressor for generating a pressure for supplying the auxiliary ink container; A first air filter configured to remove moisture from the air compressed by the compressor; It consists of a first regulator for lowering the pressure of the air filtered by the first air filter.

The pressure control means may include: a main air tank for temporarily storing air transferred from the pressure generating and lowering means; A pressure control switch for blocking an ink charge board installed in a conduit connected to the head in order to prevent the ink from flowing out of the head when the pressure of the air stored in the main air tank is lower than a reference value; When the pressure of the main air tank is more than the reference value, it consists of a safety valve for discharging the air to maintain the required pressure.

The water and pressure drop means may include: a plurality of second air filters for filtering foreign matter from the air transferred from the pressure control means; A plurality of second regulators for lowering the pressure of the air passing through the second air filter again.

Moreover, it is preferable that each said 2nd air filter and a 2nd regulator are provided alternately alternately.

The pressure supply means includes: a first distribution unit configured to distribute the air transfer to the vacuum line and the purge line; A vacuum regulator for reducing the pressure of air moving from the first distribution part to the vacuum line to a positive pressure close to the vacuum; A vacuum ejector for converting the air having a reduced pressure in the vacuum regulator into a negative suction pressure; A purge regulator for lowering the air moving to the purge line by the first distributing part to a slight positive pressure; First and second purge simultaneously pressed by a manual button to maintain the negative suction pressure generated in the vacuum ejector or to selectively switch the positive pressure generated in the purge regulator to the first and second auxiliary purge lines. A valve; It consists of an auxiliary air tank which temporarily stores the negative suction pressure or the positive pressure selected and selected by the first and second purge valves, and maintains the pressure stably and distributes it to the pressure supply pipe before supplying it to the auxiliary ink container. .

In addition, the auxiliary air tank is preferably provided with a pressure sensor for detecting the pressure to display the detected pressure as a digital gauge.

The first auxiliary purge line branched from the first purge valve has a solution supply valve for manually or automatically shutting off the supply to distribute the air supplied to the solution bar and the air supplied to the solution solution container from the second distribution unit. And a first and second backflow check valve for preventing the air distributed in the first distribution part from flowing back from the solution bar and the solution solution container.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a perspective view of a digital printing machine with a head pressure device according to the present invention, Figure 4 is a view showing the configuration of the head pressure device according to the present invention, Figure 5 is an enlarged ink pressure control stage according to the present invention Figure 6 is an enlarged view of the main portion of the head pressure device according to the present invention, Figure 7 is a view showing a state of use of the head pressure device according to the present invention.

The constitution of the present invention includes an ink and solution pump (54) (56) for pumping and supplying the ink and the solution of the main ink container (13) and the solution solution container (50); Ink and solution filters (58) and (60) for filtering ink and solution solutions transferred to the ink and solution pumps (54, 56); The auxiliary ink container 70 and the auxiliary solution solution container 71 temporarily storing the ink and solution transferred through the ink and solution filters 58 and 60 and continuously supplying the ink and solution to the head 26 of the head part 7. )

Then, the pressure generating and lowering means 80 for generating water at a high pressure to provide pressure to the auxiliary ink container 70 and the auxiliary solution solution container 71 to remove moisture contained in the air and to lower the pressure. and; A pressure control means (90) for storing the air regulated by the pressure generating and lowering means (80) and maintaining the pressure at the upper and lower pressures; Water and pressure drop means 100 for repeatedly removing water from the air controlled by the pressure control means 90 and lowering the pressure; By selectively controlling the pressure in the auxiliary ink container 70 by converting the air supplied from the water and the pressure drop means 100 into a negative pressure in the vacuum line 114 or maintaining a positive pressure in the purge line 124 It consists of a pressure supply means 110 to supply.

The pressure generating and dropping means (80) includes: a compressor (82) for generating a pressure for supplying the auxiliary ink container (70); A first air filter (84) for removing moisture from the air compressed by the compressor (82); It consists of a first regulator 86 to lower the pressure of the air filtered by the first air filter 84.

And, the pressure control means 90, the main air tank 88 to temporarily promote the air generated in the pressure generating and lowering means (80) and the pressure of the air stored in the main air tank 88 is a reference value In the following case, the pressure control switch 92 to block the ink charge board 94 installed in the conduit connected to the head 26 in order to prevent the ink from pouring in the head 26 and the main air tank 88 In the case where the pressure of) is greater than or equal to the reference value, it is composed of a safety valve 96 for discharging air to the outside to maintain the required pressure.

The water and pressure drop means 100 includes: a plurality of second air filters 102 for filtering foreign matter from the air transferred from the pressure control means 90; It is composed of a plurality of second regulator 104 for reducing the pressure of the air passing through the second air filter 102 again.

Each of the second air filter 102 and the second regulator 104 are alternately provided alternately.

In addition, the pressure supply means 110, the first distribution unit 111 for distributing the transfer of air to the vacuum line 114 and the purge line (124); A vacuum regulator 116 for lowering the pressure of air moving from the first distribution part 111 to the vacuum line 114 to a positive pressure close to vacuum; A vacuum ejector (118) for converting air having a reduced pressure in the vacuum regulator (116) into a negative suction pressure; A purge regulator 122 for lowering the air moving to the purge line 124 by the first distributing portion 111 to a slight positive pressure; Manual button to maintain the negative suction pressure generated in the vacuum ejector 118 or to selectively switch the positive pressure generated in the purge regulator 122 to the first and second auxiliary purge lines 125 and 127. First and second purge valves 112 and 120 simultaneously pressed by 132; Temporarily store the negative suction pressure or the positive pressure selected and moved by the first and second purge valves 112 and 120 to maintain a stable pressure before supplying the auxiliary ink container 70 to the pressure supply pipe. And an auxiliary air tank 126 for dispensing to 136.

In addition, the auxiliary air tank 126 is provided with a pressure sensor 128 for detecting the pressure is configured to display the detected pressure by the digital gauge (130).

The second auxiliary purge line 125 branched from the first purge valve 112 receives air supplied to the solution bar 74 and air supplied to the solution solution tank 71. A solution supply valve 134 is formed to manually or automatically shut off the supply so as to be dispensed at 135, and the air distributed at the first distribution part 135 flows back from the solution bar 74 and the solution solution container 71. The first and second non-return valves (76) and (78) to prevent them from being formed.

In addition, a third distribution part 138 is formed between the first non-return valve 76 and the solution solution container 71, and the pressure adjustment to maintain the internal pressure of the solution solution container 71 at atmospheric pressure. The valve 142 and the non-return valve 140 to prevent the back flow of the pressure to be formed.

Hereinafter, the operation and effects according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 7, first, when the ink and the solution are supplied from the main ink container 13 to the head 26, the ink and solution stored in the main ink container 13 and the solution solution container 50 will be described. The solution is pumped from the ink pump 54 and the solution pump 56 through the main supply line 52 to be filtered out of the ink filter 58 and the solution solution filter 60.

Then, the ink and the solution continuously moving to the ink supply line 62 and the solution supply line 64 are transferred to the auxiliary ink container 70 and the auxiliary solution liquid container 71 and temporarily stored.

Then, the ink of the auxiliary ink container 70 is supplied to the head 26 of the head portion 7 through the three-way valve 72 and is injected to perform a printing operation on the media.

On the other hand, the solution solution stored in the auxiliary solution solution container 71 is distributed from the solution bar 74 from the solution three-way valve 72 along the pipeline to the head portion 7 via the three-way valve 72 for ink. It is supplied and used to dissolve the ink deposits on the head 26.

On the other hand, looking at the state of providing the supply pressure through the auxiliary ink container 70, the high pressure is generated in the compressor 82, the pressure generating and lowering means 80, and the water in the first air filter 84 Remove, and reduce the pressure in the first regulator (86).

The air moved from the first regulator 86 is temporarily stored in the main air tank 88, which is the pressure control means 90.

At this time, when the pressure inside the main air tank 88 is lower than the reference value, since the ink supplied to the head 26 may flow due to the pressure drop applied to the auxiliary ink container 70, the head may be discharged from the pressure switch 92. Blocking the ink charge board 94 installed in the conduit of (26) to block the ink supply to the head (26).

When the pressure inside the main air tank 88 is greater than or equal to the reference value, since the pressure applied to the auxiliary ink container 70 may be excessive, the air is discharged from the safety valve 96 to lower the pressure appropriately. do.

Then, the air moving the pressure control means 90, the water is removed while passing through a plurality of second air filter 102, which is water and pressure drop means 100, a plurality of second regulator 104 The pressure is reduced while going through.

Then, the air passing through the water and the pressure drop means 100 is distributed to the vacuum line 114 and the purge line 124 in the first distribution unit 111 that is the pressure supply means 110, the vacuum line The air moved to 114 is lowered to a low pressure close to the vacuum in the vacuum regulator 116.

In addition, the air that moves the vacuum regulator 116 is converted from the positive pressure to the negative suction pressure (differential pressure) in the vacuum ejector 118 to be stable in the auxiliary air tank 126 via the second purge valve 120. The pressure is supplied to the auxiliary ink container 70 through the pressure supply pipe 136 is maintained in a plurality of lines to maintain the pressure.

At this time, the negative pressure supplied to the auxiliary ink container 70 serves to suck ink from the main ink container 13, store the ink in the auxiliary ink container 70 at a constant height, and uniformly supply the ink to the head 26.

And, if the supply of ink supplied to the head 26 is weakened to temporarily increase the supply, the air moving to the purge line 124 is lowered to a weak positive pressure in the purge regulator 122. The operator presses the first and second purge valves 112 and 120 simultaneously for 2 to 3 seconds with the manual button 132 to connect the purge line 124 to the second auxiliary purge line 127. In the auxiliary air tank 126, the positive pressure is uniformly supplied to the auxiliary ink container 70 through the pressure supply pipe 136.

At this time, the amount of ink injected to the head 26 by the positive pressure supplied to the auxiliary ink container 70 is raised to be very instantaneously, such as 2 to 3 seconds, and when the purpose is achieved, the manual button ( 132 is released to return the first and second purge valves 112 and 120 to their original state, thereby disconnecting the purge line 124 and the second auxiliary purge line 127, and then vacuum ejector. 118 and the vacuum line 114 of the auxiliary tank 126 to be connected again.

When the supply of ink to the head 26 is instantaneously increased by the positive pressure applied to the auxiliary ink container 70, the ink supply is continuously increased even when the auxiliary ink container 70 is switched to negative pressure again. Will be maintained.

As such, since the pressure of the air moving to the vacuum line 114 and the purge line 124 is switched to the first and second purge valves 112 and 120 to a positive pressure and a negative pressure, and is supplied to be adjusted. The amount of ink supplied to the head 26 can be automatically controlled.

In addition, although the first and second purge valves 112 and 120 describe a manual method of operating by the manual button 132, an automatic valve may be used as the solenoid valve.

Meanwhile, the pressure of the auxiliary air tank 126 is measured by the pressure sensor 128 and displayed by the digital gauge 130 so that the user can grasp the supply state of the positive pressure and the negative pressure.

In addition, the air moving to the purge line 124 is supplied to the first auxiliary purge line 125 when the first purge valve 112 does not operate, and at the solution supply valve 134. It is blocked.

if. When the solution supply valve 134 is opened to clean the head 26, the air distributed in the second distribution unit 135 passes through the auxiliary solution liquid reservoir via the plurality of backflow prevention valves 76. Pressure is applied to the 71, and the solution solution stored by this pressure is distributed from the solution bar 74 to the solution three-way valve 72 along the pipeline, and passes through the three-way valve 72 for ink to the head portion 7. Is used to dissolve the ink deposits on the head (26).

In addition, a part of the air distributed from the second distribution unit 135 to the other line is directly supplied to the solution three-way valve 72 through the non-return valve 78 to apply pressure to the head 26. To help.

Therefore, as described above, when the head pressure control device of the digital printing machine of the present invention is used, the pressure generated in the compressor is removed from the water in the plurality of air filters, and the vacuum is reduced in the pressure in the plurality of regulators. By switching to negative pressure in the vacuum ejector of the line or to positive pressure in the purge line, it is selected and supplied to the auxiliary ink tank by adjusting the first and second purge valves so that ink can be supplied uniformly and continuously at a constant pressure to the head. It is a very useful and effective invention.

Claims (8)

An ink and solution pump for pumping and supplying ink and a solution of the main ink container and the solution solution container; An ink and solution filter for filtering the ink and the solution solution transferred to the ink and the solution pump; In the digital printing machine consisting of the auxiliary ink container and the auxiliary solution solution container for temporarily storing the ink and solution transferred through the ink and solution filter and continuously supplied to the head of the head portion, Pressure generation and dropping means for generating a high pressure to remove moisture contained in the air and lowering the pressure; Pressure control means for storing the air regulated by the pressure generating and lowering means and maintaining the pressure at an upper limit pressure and a lower limit pressure; Water and pressure drop means for repeatedly removing water from the air controlled by the pressure control means and lowering the pressure; Pressure supply means for converting the air supplied from the water and pressure drop means into a negative pressure in the vacuum line or to maintain a positive pressure in the purge line to selectively control the pressure supplied to the auxiliary ink container Head pressure control device of digital printing machine. The pressure generating and lowering means of claim 1, further comprising: a compressor for generating a pressure for supplying the auxiliary ink container; A first air filter configured to remove moisture from the air compressed by the compressor; Head pressure control device of the digital printing machine, characterized in that the first regulator for reducing the pressure of the air filtered by the first air filter. According to claim 1, wherein the pressure control means, The main air tank for temporarily storing the air conveyed from the pressure generating and lowering means; A pressure control switch for blocking an ink charge board installed in a conduit connected to the head in order to prevent the ink from flowing out of the head when the pressure of the air stored in the main air tank is lower than a reference value; When the pressure of the main air tank is more than the reference value, the head pressure control device of the digital printing machine, characterized in that made of a safety valve for discharging the air to maintain the required pressure. 2. The apparatus of claim 1, wherein the water and pressure drop means comprises: a plurality of second air filters for filtering foreign matter from the air transferred from the pressure control means; Head pressure control device of a digital printing machine, characterized in that made of a plurality of second regulator for lowering the pressure of the air passed through the second air filter again. 3. The head pressure control apparatus of a digital printing machine according to claim 2, wherein each of the second air filter and the second regulator are alternately installed alternately. 2. The apparatus of claim 1, wherein the pressure supply means comprises: a first distribution unit configured to distribute a transfer of air to the vacuum line and the purge line; A vacuum regulator for reducing the pressure of air moving from the first distribution part to the vacuum line to a positive pressure close to the vacuum; A vacuum ejector for converting the air having a reduced pressure in the vacuum regulator into a negative suction pressure; A purge regulator for lowering the air moving to the purge line by the first distributing part to a slight positive pressure; First and second purge simultaneously pressed by a manual button to maintain the negative suction pressure generated by the vacuum ejector or to selectively switch the positive pressure generated by the purge regulator to the first and second auxiliary purge lines. A valve; The auxiliary air tank, which is selected by the first and second purge valves, temporarily stores the negative suction pressure or the positive pressure that is moved and maintains the pressure stably before distributing it to the auxiliary ink container. Head pressure control device of a digital printing machine, characterized in that. The head pressure control apparatus of claim 6, wherein a pressure sensor for detecting pressure is installed in the auxiliary air tank to display the detected pressure as a digital gauge. 7. The method of claim 6, wherein the first auxiliary purge line branched from the first purge valve is cut off manually or automatically to supply the air supplied to the solution bar and the air supplied to the solution solution in the second distribution part. And a first and second backflow check valve for preventing backflow of the air dispensed from the first distribution part from the solution bar and the solution solution container. Pressure control system.

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