JPH0985940A - Spray type applicator in offset press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the arbitrary controlling of the application of liquid, make uniform application from each nozzle even when a plurality of nozzles are used, make the clogging of the nozzle hard to develop even when the spread is extremely small and become the necessity of maintenance small. SOLUTION: This device is equipped with a constant flow distributing valve, which discharges a certain fixed amount of liquid under pressure at every one action, and a spray nozzle, which nearly uniformly atomizes the liquid supplied from the constant flow distributing valve over the predetermined period of time. The spray nozzle has a liquid flow path and an air flow path independent from each other. The air flow path has a small diameter nozzle hole 34b directly downwards and a mixing chamber 34a provided above the nozzle hole. The liquid flow path has a liquid nozzle 35a dripping to the mixing chamber and a flow rate controlling device 32 and 32a, in which a chamber buffering the liquid pressure charging to the liquid nozzle is provided so as to regulate a buffering force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray type coating device in an offset printing machine.

[0002]

2. Description of the Related Art A lithographic printing machine is widely used in both a sheet-fed type and a winding type, and most of them are of an offset type. this house,
The take-up type lithographic press is usually called an offset press, and has a sheet feeding device, a printing unit, a drying device, and a folding machine as main components.

The structure of the printing unit is roughly classified into a common impression cylinder type and a BB type. As shown in FIG. 7, the common impression cylinder type has a plurality of plate cylinders P and blanket cylinders B arranged around an impression cylinder I, and is also called a satellite type or a drum type. The technological innovation of offset printing machines is remarkable, and efforts are being made day and night to improve printing technology and save labor. For example, the impression cylinder B (satellite impression cylinder) of an offset printing machine is indispensable for cleaning because the quality of the printing paper surface is deteriorated by the stain. It is almost impossible to manually perform this impression cylinder cleaning because the work space is small. Therefore, a method has been conventionally used in which a cleaning liquid is automatically applied during printing and wiped off on the paper surface. As means for applying the cleaning liquid, there are a jump method using a brush and a spray method using air pressure. Further, as for the application of the dampening water for printing to the plate cylinder P of the offset printing machine, there is also a spray method or the like.

[0004]

In the offset printing machine, both the application of the cleaning liquid to the impression cylinder B and the application of the dampening water to the plate cylinder P are applied in a minute and uniform amount, and the application is performed. The ability to adjust the quantity arbitrarily is essential to maintain high quality printing. However, among the above-mentioned conventional coating means, the brush method is not able to freely adjust the coating amount of the liquid, and it is difficult to evenly coat the liquid. Further, for the abrasion of the brush portion and the cleaning of the liquid supply reservoir, etc. There are problems such as frequent maintenance. For this reason,
The spray method using air pressure is mainly used.

FIG. 8 is a block diagram of a spray nozzle used in a conventional spray system. This spray nozzle has a central liquid passage 1 and an air passage 2 around it,
The tip of the needle 3 adjusts the size of the ejection port from the liquid flow path 1. The cleaning liquid and dampening water are in the liquid flow path 1
Low pressure (eg 1kg / cm ²
The air supplied to the air passage 2 is 3 to 4 kg / cm ²
Supplied at pressure. Compressed air (air) is in the air passage 2
When ejected annularly from the inside, a negative pressure is generated inside, and the liquid is sucked out from the ejection port of the liquid flow path 1 and sprayed while being mixed with air by a kind of spraying principle. In this figure, 4 is a needle moving piston, 5 is a piston spring,
6 is a needle spring.

However, in the spray method shown in FIG. 8, the amount of the spray applied is adjusted by changing the diameter of the flow path by the throttling mechanism of the needle 3 to adjust the spray application amount. In this case, the size of the ejection port from the liquid flow path 1 becomes very small. Therefore, even if the position of the needle 3 is slightly moved, the flow rate is largely changed and the coating amount for each nozzle is changed. Further, since impurities in the liquid are likely to be generated in the cleaning liquid and the dampening water, if they are caught in the tip portion of the needle 3, fluctuations in the coating amount and liquid leakage will occur, and in extreme cases, the jet outlet of the liquid flow path 1 There is a problem of blocking. Particularly in this nozzle, if the liquid pressure is too high, it becomes difficult to finely adjust the liquid amount, so it is necessary to make the pressure as low as possible, and even if small dust enters, it will be clogged immediately. Therefore, in order to maintain good application of the liquid, it is necessary to regularly clean the nozzle, which is a problem in maintenance work.

That is, in the conventional spray system, since the flow rate is adjusted by the needle 3,
In the case of a small amount of spray, the nozzle is likely to be clogged, and the flow rate must be controlled by the nozzle itself.
It was difficult on the job. Therefore, the spray method using air pressure can apply a substantially uniform coating with a single nozzle, but when a plurality of nozzles are used, the coating amount of each nozzle tends to be uneven (unbalanced), and There is a problem that the nozzle is likely to be clogged when the coating amount is small.

The present invention was devised to solve such problems. That is, the object of the present invention is to adjust the coating amount of the liquid arbitrarily, it is possible to uniformly coat with each nozzle even when using a plurality of nozzles, even if the coating amount is a small amount, clogging of the nozzle hardly occurs, maintenance It is an object of the present invention to provide a spray-type coating apparatus in an offset printing machine that requires less.

[0009]

According to the present invention, a metering valve for pressurizing and discharging a fixed amount of liquid for each operation and a liquid supplied from the metering valve are made substantially uniform over a predetermined time. The spray nozzle has a liquid flow path and an air flow path which are independent of each other, and the air flow path has a small-diameter nozzle opening facing downward and a mixing chamber provided above the nozzle opening. In the offset printing machine, the liquid flow path has a liquid nozzle for dropping the liquid into the mixing chamber and a flow rate adjusting device for adjusting the buffer force by providing a chamber for buffering the liquid pressure to the liquid nozzle. A spray applicator is provided.

According to the above-mentioned constitution of the present invention, the application amount of the liquid can be accurately and freely adjusted by the number of operations of the quantitative distribution valve which pressurizes and discharges a fixed amount of liquid for each operation, and in particular, a plurality of liquids can be adjusted. Even when the spray nozzles are used, the application amounts of the spray nozzles can be accurately matched by matching the respective numbers of operations. Further, the spray nozzle has a liquid flow path and an air flow path independent of each other,
Since the liquid is dropped from the liquid nozzle of the liquid flow path into the mixing chamber of the air flow path, there is no throttle part other than the liquid nozzle in the liquid flow path,
Even if impurities or dust are mixed in the liquid, it can be dropped into the mixing chamber as it is from a liquid nozzle having a large hole diameter and sprayed by air pressure from the nozzle port of the air flow path. Further, since the liquid is pressurized and supplied to the spray nozzle by the quantitative distribution valve, the liquid pressure to the spray nozzle can be increased more than before, and the liquid flow passage remains wide even when the coating amount is small, Even if impurities or dust are mixed in the liquid,
The nozzle is unlikely to be blocked, and the need for maintenance can be almost eliminated.

Further, since the liquid flow passage has a flow rate adjusting device for adjusting the flow passage area to the liquid nozzle, a predetermined amount of the liquid supplied by the operation of the quantitative distribution valve is predetermined according to the application amount. Can be sprayed almost uniformly over the time.

According to a preferred embodiment of the present invention, the flow rate adjusting device comprises a substantially cylindrical liquid chamber provided above the liquid nozzle, and a substantially cylindrical liquid introduction partly intersecting with the liquid chamber. Chamber and a flow rate adjusting rod rotatably mounted in the liquid introducing chamber about an axis, and the flow rate adjusting rod has a cutout portion, and the cutout portion is provided in the liquid chamber by rotation of the flow rate adjusting rod. The flow passage area where the liquid introduction chamber and the liquid introduction chamber intersect is changed. With this configuration, by simply rotating the flow rate adjusting rod about its axis, the buffering force of the liquid pressure to the liquid nozzle is adjusted, and a fixed amount of liquid supplied in a short time is activated by the operation of the quantitative distribution valve. It is possible to spray from the nozzle almost uniformly over a predetermined time.

The metering valve includes a metering valve body having a hollow cylindrical cylinder, a cylindrical plunger that reciprocates in the cylinder at a constant stroke, and an air piston that reciprocates the plunger. Equipped with a suction check valve that opens when the cylinder is under negative pressure to supply liquid into the cylinder and a discharge check valve that opens when the cylinder is pressurized to supply liquid to the spray nozzle. A fixed amount of liquid is pressurized and discharged for each operation. With this configuration, the amount of liquid supplied by one operation can be precisely determined by the diameter and stroke of the plunger, and a strictly constant amount of cleaning liquid is supplied via the conduit each time air is supplied. can do.

Further, a tank unit for supplying the liquid to the quantitative distribution valve, a quantitative distribution valve operating unit for intermittently supplying air to the quantitative distribution valve, a nozzle operating unit for supplying air to the spray nozzle, and a quantitative distribution valve. And a control device for controlling the actuation unit and the nozzle actuation unit. With this configuration, the tank unit can always stably supply the liquid to the quantitative distribution valve, and the quantitative distribution valve actuating unit operates the quantitative distribution valve at a predetermined frequency according to a command from the control device to accurately and accurately wash a fixed amount of cleaning liquid. Can be supplied to the spray nozzle, and the nozzle operation unit keeps the liquid flow path wide even when the coating amount is very small.
It is possible to spray the supplied constant amount of the liquid substantially uniformly over a predetermined time corresponding to the coating amount without causing the nozzle to be clogged.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 is a configuration diagram of an offset printing machine provided with a spray type coating apparatus according to the present invention. In this figure, four pairs of blank cylinders B and plate cylinders P are surrounded around the common impression cylinder I. As in FIG. 7, the printing paper enters from above in this figure, and the common impression cylinder I and four blanks It is sandwiched between the cylinder B and the cylinder B, passes around the common impression cylinder I, and comes out upward again. For example, black, crimson, indigo, and yellow offset printing is performed by each of the blank cylinders B and the plate cylinders P. As shown in the drawing, a large number of rollers are in contact with and roll around each of the blanket cylinders B and the plate cylinders P, and one of them (for example, the roll 7) is a swimsuit roll for dampening water. An ASO roller 8 is provided above the common impression cylinder I, and a spray nozzle 30 described later is arranged above the ASO roller 8.

FIG. 2 is a partial side view of FIG. As shown in this figure, a plurality of spray nozzles 30 are arranged at equal intervals along the ASO roller 8, and the cleaning liquid is sprayed (sprayed) uniformly from each spray nozzle 30. Hereinafter, the present invention will be described with respect to the case of applying the cleaning liquid to the ASO roller 8 for cleaning the common impression cylinder I. However, the case of directly applying the cleaning liquid to the common impression cylinder I and the swimsuit roll for dampening water It goes without saying that the present invention can be applied as it is to the case of applying water to 7.

FIG. 3 is an overall system diagram of the spray type coating apparatus 10 according to the present invention. In this figure, a spray type coating apparatus 10 of the present invention includes a tank unit 12, a tank pressurizing unit 14, a fixed quantity distribution valve operation unit 15, a nozzle operation unit 16, a control device 18, a fixed quantity distribution valve 20,
It is composed of a spray nozzle 30 and the like. The tank unit 12 is an airtight container filled with a cleaning liquid, pressurizes the cleaning liquid with compressed air (air) supplied from the tank pressurizing unit 14, and constantly supplies the cleaning liquid to the quantitative distribution valve 20 through the liquid supply pipe 12a. It is supposed to do. The tank pressurizing unit 14 is a so-called pressure reducing valve, and the high pressure air (for example, about 7.0 kg / cm ² g) supplied from the air pressure source 11 is required for the tank unit 12 at a low pressure (for example, 0.3 to 1). The pressure is reduced to 0.0 kg / cm ² g). The tank unit 12 may be of a pump type.

The quantitative distribution valve operating unit 15 includes a solenoid valve 1
5a, a pressure reducing valve 15b, an oiler 15c, an air filter 15d, and a pneumatic pipe 15e, and air of an appropriate pressure is supplied to the quantitative distribution valve 20 via the pneumatic pipe 15e. The pressure reducing valve 15b, the oiler 15c, and the air filter 15d are protective devices for the solenoid valve 15a, and remove dust and the like in the high-pressure air supplied from the air pressure source 11, reduce the pressure, and add lubricating oil. ing.

One or a plurality of solenoid valves 15a are provided according to the number of the quantitative distribution valves 20. In this figure, two fixed quantity distribution valves 20 are used for every ten fixed quantity distribution valves 20, but the present invention is not limited to this, and for example, for each fixed quantity distribution valve 20. The solenoid valve 15a may be provided, or one solenoid valve 15a may be provided as a whole. The solenoid valve 15a is preferably a three-port solenoid valve, and is capable of turning on / off the supply of air to the constant amount distribution valve 20 in response to a command from the control device 18. That is, when the solenoid valve 15a is operated downward in the figure, the pneumatic piping 15e
Air is supplied to the quantitative distribution valve 20 via the valve, and when the valve is operated upward in the figure, the air in the pneumatic pipe 15e is exhausted.

The metering valve 20 has a structure which will be described later.
The solenoid valve 15a is operated to supply a strictly constant amount of cleaning liquid to the spray nozzle 30 via the conduit 20a each time air is supplied from the pneumatic pipe 15e.

The nozzle operating unit 16 includes a solenoid valve 16
a, a pressure reducing valve 16b, an air filter 16d, and a pneumatic pipe 16e, and air of an appropriate pressure is supplied to the spray nozzle 30 through the pneumatic pipe 16e. The pressure reducing valve 16b and the air filter 16d are protective devices for the solenoid valve 16a, like the fixed quantity distribution valve operating unit 15. In this nozzle operating unit 16, air supplied through the spray nozzle 30 is sprayed (sprayed) as will be described later, so an oiler is not used so that lubricating oil does not adhere to the printing paper.

One or more solenoid valves 16a are provided depending on the number of spray nozzles 30. This solenoid valve 16a
Is preferably a two-port solenoid valve, and the supply of air to the spray nozzle 30 can be turned on / off by a command from the control device 18.

One spray nozzle 30 is provided for each quantitative distribution valve 20, and is connected to the quantitative distribution valve 20 by a conduit 20a. Further, the spray nozzle 30 has a structure which will be described later so that the cleaning liquid is continuously sprayed by the air pressure while the electromagnetic valve 16a is operated and air is supplied from the pneumatic pipe 16e.

The operation of the spray type coating apparatus according to the present invention will be described below based on the above description. In FIG. 3, when the cleaning liquid is sprayed from the spray nozzle 30 and is applied to the ASO roller 8, first, when the solenoid valve 15a is operated, air is sent to the quantitative distribution valve 20 to operate, and a fixed amount of the cleaning liquid is discharged. To do. This cleaning liquid is pressure-fed to the spray nozzle 30 via the conduit 20a. Air is supplied to the spray nozzle 30 at a low pressure when spraying the cleaning liquid by the operation of the solenoid valve 16a, and when the cleaning liquid is supplied to the spray nozzle 30 at a high pressure, the air is mixed with the air in the nozzle, It spreads from the tip and becomes a spray mist and is applied to the ASO roller 8.

As shown in FIG. 2, by appropriately arranging the spray nozzles 30 for ejecting a certain amount of cleaning liquid in the width direction of the impression cylinder I (or ASO roller 8), the entire surface of the impression cylinder I or ASO roller 8 can be obtained. It is possible to apply the cleaning liquid uniformly. Further, since the coating amount is determined by the operation frequency (the number of operations within a unit time) of the quantitative distribution valve 20, the control panel 1
By controlling the energization operation set value of the solenoid valve 15a by 8 and setting the operation frequency of operating the quantitative distribution valve 20, the amount of the cleaning liquid sprayed from the spray nozzle 30, that is, the application amount can be freely set. it can.

FIG. 4 is an overall configuration diagram of the metering valve 20 according to the present invention, (A) is a sectional view, and (B) is a side view. As shown in FIG. 4 (B), a common air inlet 20b and a cleaning liquid inlet 20c are provided for the plurality of quantitative distribution valves 20, and the pneumatic pipe 15e of the quantitative distribution valve operating unit 15 is connected to the air inlet 20b. , Cleaning liquid inlet 20c
The liquid supply pipe 12a of the tank unit 12 (FIG. 3) is connected to the.

In FIG. 4A, the metering valve 20 of the present invention comprises a metering valve main body 21, an air piston 22, a plunger 23, check valves 24, 25, etc., and the metering valve main body 21 includes 21a, 21b, 21c, 21d. The metering valve body 21 has an air piston 22
Is incorporated therein, whereby the plunger 23 which receives a reaction force via the spring 26 is connected. A discharge check valve 25 is incorporated in the discharge port portion (downward in this figure) of the plunger 23. The liquid passage 27b communicates with the cleaning liquid inlet 20c, the cleaning liquid is constantly supplied from the tank unit 12 at a constant pressure, and the cylinder 28 into which the plunger 23 is fitted is filled through the suction check valve 24. There is.

On the other hand, the air passage 27a is connected to the air inlet 2
0b, and when air is supplied to the air passage 27a from the constant quantity valve operating unit 15, the air piston 22 moves down against the reaction force of the spring 26, and the plunger 23 also moves down in the cylinder. Plunger 2
The liquid in the cylinder 28 is pressurized by the lowering of 3, and the suction check valve 24 is closed and the discharge check valve 25 is closed.
And is discharged from the discharge port 29 provided in the main body portion 21d. This discharge amount is determined by the diameter and stroke of the plunger 23 and is always constant.

Next, when air is exhausted from the air passage 27a, the air piston 22 rises by the reaction force of the spring 26, and at this time, the plunger 23 also retracts (raises in the figure) in the cylinder 28. When the plunger 23 rises,
The cylinder 28 has a negative pressure, the discharge check valve 25 is closed, the suction check valve 24 is opened, the cylinder is filled with the liquid, and the next operation preparation is completed.

With the above-described structure, the solenoid valve 15a is operated, and every time air is supplied from the pneumatic pipe 15e, a strictly constant amount of cleaning liquid is supplied to the spray nozzle 3 through the conduit 30a.
0 can be supplied.

FIG. 5A is an overall configuration diagram of the spray nozzle according to the present invention, and FIG. 5B is a sectional view thereof. The spray nozzle 30 according to the present invention does not have a restricting structure in the liquid flow path, and is configured to spray a fixed amount of the cleaning liquid pressure-fed from the quantitative distribution valve 20 through the conduit 20a uniformly for as long as possible. In FIG. 5, the spray nozzle 30 includes a nozzle body 31, a flow rate adjusting rod 32, a cap 33, an air nozzle 34, a liquid nozzle 35, and the like. Adjustment bar 3 having a notch 32a in the nozzle body 31
2 is screwed in, the air nozzle 34, the liquid nozzle 3
5 is fixed to the nozzle body 31 by the cap 33. The O-rings 36a and 36b are sealing materials for making each section independent.

In FIG. 5, the cleaning liquid is dispensed into the liquid introducing port 31a communicating with the cutout portion 32a of the adjusting rod 32 in the fixed amount distribution valve 2.
The cleaning liquid is pumped from 0.
To a substantially cylindrical liquid chamber 31b provided above the liquid nozzle 35, and drops downward through a through hole 35a provided at the center of the liquid nozzle 35. On the other hand, the low-pressure air supplied from the air inlet 31c provided in the nozzle body 31 enters the air chamber 31d surrounding the liquid nozzle 35, and passes through the communication chamber 33a provided in the center of the cap 33 to the air nozzle 34. Entering the mixing chamber 34a provided in the center, the tip (lower end) of the air nozzle 34
It is designed to be ejected to the outside from a nozzle opening 34b provided in the.

With the above structure, the spray nozzle 30
The air supplied to the air chamber 31d, the communication chamber 33a
Then, the cleaning liquid is ejected to the outside from the nozzle opening 34b through the mixing chamber 34a, and a certain amount of the cleaning liquid is injected at a high pressure from the quantitative distribution valve 20 and passes through the notch 32a, the liquid chamber 31b, and the through hole 35a, and the mixing chamber 34a Is mixed with air in the mixing chamber 34a, and the pressure of the air causes the nozzle port 34 to mix with the air.
It is sprayed from b to the outside. Therefore, the cleaning liquid can be continuously sprayed by the air pressure while the electromagnetic valve 16a is operated and the air is supplied from the pneumatic pipe 16e.

FIG. 6 is a sectional view taken along the line AA of FIG. 5, showing a cleaning liquid flow rate adjusting means. In this figure, (A) shows a small flow rate, and (B) shows a large flow rate. As described above, the cleaning liquid is used in the metering valve 2
Since a fixed amount is injected at a pressure higher than 0 and drops into the mixing chamber 34a through the notch 32a, the liquid chamber 31b, and the through hole 35a, the absolute amount of the cleaning liquid is precisely controlled by the quantitative distribution valve 20. However, the dropping amount into the mixing chamber 34a may fluctuate at least temporarily, and the adjusting rod 32 is used so that the dropping amount may be uniformly dropped as long as possible.

That is, when the liquid supply pressure is high,
As shown in FIG. 5A, when the liquid flow path flowing from the notch 32a to the liquid chamber 31b is narrowed to increase the buffering force of the pressure of the cleaning liquid flowing into the liquid chamber 31b, conversely, when the liquid supply pressure is small. As shown in FIG. 5B, the liquid chamber 3 is cut from the cutout 32a.
The liquid flow path flowing in 1b is expanded to reduce the buffering force of the pressure of the cleaning liquid flowing into the liquid chamber 31b. In this way, the mixing chamber 3
The amount dropped onto the nozzle 4a can be made substantially uniform, and the amount sprayed from the nozzle port 34b can be made constant over a long period of time.

According to the above-mentioned configuration of the present invention, the amount of liquid applied can be accurately and arbitrarily adjusted by the number of operations of the quantitative distribution valve 20 which pressurizes and discharges a fixed amount of liquid for each operation. Even when a plurality of spray nozzles 30 are used, the application amounts of the spray nozzles 30 can be accurately matched by matching the respective numbers of operations.

The spray nozzle 30 has a liquid flow path 31a, 31b, 35a and an air flow path 31 which are independent of each other.
c, 31d, 33a, 34a, and since the liquid is dropped from the liquid nozzle 35 of the liquid flow path into the mixing chamber 34a of the air flow path, there is no throttling part other than the liquid nozzle 35 in the liquid flow path, Even if impurities or dust are mixed in, the hole diameter (through hole 3
5a) can be dropped into the mixing chamber as it is from the large liquid nozzle 35 and sprayed by air pressure from the nozzle opening 34b of the air flow path. Further, since the liquid is pressurized by the quantitative distribution valve 20 and is supplied to the spray nozzle 30,
Since the liquid pressure of the spray nozzle 30 can be increased more than before, and the liquid flow path remains wide even when the amount of coating is small, even if impurities or dust are mixed in the liquid, nozzle clogging is less likely to occur, and maintenance is easy. Can almost eliminate the need for.

Further, since the liquid flow path has a flow rate adjusting device 32 for adjusting the flow path area to the liquid nozzle, a fixed amount of liquid supplied by the operation of the quantitative distribution valve 20 corresponds to the application amount. Can be sprayed almost uniformly over the predetermined time. The present invention is not limited to the above-mentioned embodiment,
Needless to say, various changes can be made without departing from the scope of the present invention.

[0039]

As described above, the spray type coating device in the offset printing machine of the present invention has the following features. The structure is provided with a metering valve to temporarily retain the high-pressure liquid in the nozzle to extend the spraying time, and uniform spraying is performed. Therefore, the injection amount is accurate and uniform spraying is possible. Since the spray injection amount is proportional to the operation frequency of the metering valve corresponding to the nozzle, the injection amount can be set arbitrarily for each nozzle. Since the spray nozzle does not have a throttling mechanism and is operated with high liquid pressure, the nozzle is not clogged. As a result, the offset printing technique is improved, the paper surface is improved, labor and resources are saved, and the offset printing is rationalized.

Therefore, in the spray type coating apparatus of the offset printing machine of the present invention, the coating amount of the liquid can be arbitrarily adjusted, and even when a plurality of nozzles are used, uniform coating is possible by each nozzle, and the coating amount is very small. Even in the case, the nozzles are not easily clogged, and there is an excellent effect such that maintenance is less necessary.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an offset printing machine including a spray type coating apparatus according to the present invention.

FIG. 2 is a partial side view of FIG. 1 showing an arrangement of a plurality of spray nozzles.

FIG. 3 is an overall system diagram of a spray type coating apparatus 10 according to the present invention.

FIG. 4 is an overall configuration diagram of a metering valve 20 according to the present invention.

FIG. 5 is an overall configuration diagram of a spray nozzle according to the present invention and a side view thereof.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a configuration diagram of a conventional offset printing machine.

FIG. 8 is a configuration diagram of a spray nozzle used in a conventional spray type coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid flow path 2 Air passage 3 Needle 4 Piston 5 Piston spring 6 Needle spring 7 Swimsuit roll 8 ASO roller 10 Spray type applicator 11 Air pressure source 12 Tank unit 14 Tank pressurizing unit 15 Quantitative distribution valve operating unit 15a Solenoid valve 15e Empty Pressure pipe 16 Nozzle operation unit 16a Solenoid valve 16e Pneumatic pipe 18 Control device 20 Fixed amount distribution valve 20a Conduit 20b Air inlet 20c Liquid inlet 21 Fixed amount valve main body 22 Air piston 23 Plunger 24 Suction check valve 25 Discharge check valve 28 Cylinder 30 Spray Nozzle 31 Nozzle body 31a Liquid inlet 31b Liquid chamber 31c Air inlet 31d Air chamber 32 Flow rate adjusting rod 32a Cutout 33 Cap 33a Communication chamber 34 Air nozzle 34a Mixing chamber 34b Nozzle 35 Liquid nozzle 35a through hole

Claims (4)

[Claims] 1. A spray comprising: a fixed quantity distribution valve for pressurizing and discharging a fixed quantity of liquid for each operation; and a spray nozzle for spraying the solution supplied from the constant quantity distribution valve substantially uniformly over a predetermined time. The nozzle has a liquid flow path and an air flow path that are independent of each other, and the air flow path has a small-diameter nozzle opening facing downward and a mixing chamber provided above the nozzle opening. It has a liquid nozzle for dropping the liquid and a flow rate adjusting device for adjusting the buffering force by providing a chamber for buffering the liquid pressure to the liquid nozzle,
A spray type coating device in an offset printing machine, which is characterized in that 2. The flow rate adjusting device, wherein a substantially cylindrical liquid chamber provided above the liquid nozzle, a substantially cylindrical liquid introducing chamber that partially intersects the liquid chamber, and an axis line in the liquid introducing chamber. And a flow rate adjusting rod mounted rotatably around the center of the flow rate adjusting rod. The flow rate adjusting rod has a notch, and the notch causes the liquid chamber and the liquid introducing chamber to intersect with each other by the rotation of the flow rate adjusting rod. The flow passage area is changed, and the flow passage area is changed.
A spray-type coating device in the offset printing machine according to. 3. The metering valve includes a metering valve body having a hollow cylindrical cylinder, a cylindrical plunger that reciprocates in the cylinder at a constant stroke, and an air piston that reciprocates the plunger. Equipped with a suction check valve that opens when the cylinder is under negative pressure to supply liquid into the cylinder and a discharge check valve that opens when the cylinder is pressurized to supply liquid to the spray nozzle. The spray type coating device in an offset printing machine according to claim 1, wherein a fixed amount of liquid is pressurized and discharged for each operation. 4. A tank unit for supplying liquid to a quantitative distribution valve, a quantitative distribution valve operating unit for intermittently supplying air to the quantitative distribution valve, a nozzle operating unit for supplying air to a spray nozzle, and a quantitative distribution valve. The spray type coating device in the offset printing press according to claim 1, further comprising: a control device that controls the operation unit and the nozzle operation unit.