JPH0824860B2 - Paint discharge control device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a paint discharge amount control device for controlling a paint discharge amount of an automatic coating machine when coating an object to be coated with the automatic coating machine. .

(Prior Art) Conventionally, for example, in spray painting of a car body in a manufacturing plant of vehicles such as automobiles, since the viscosity of the paint changes with changes in the external environment, the amount of paint discharged from the nozzle fluctuates and the coating film changes. There was a problem that was not uniform.

Therefore, in order to solve this problem, for example, in
As disclosed in Japanese Patent Laid-Open No. 56-139162, a flow meter is provided in a paint supply passage for supplying paint from a paint supply source to a nozzle of a coating machine, and a flow meter is provided between the paint supply source and the flow meter. A paint which is provided with a flow rate control device and controls the flow rate control device by a microcomputer based on the flow rate of the paint detected by the flow meter so as to make the amount of paint discharged from the nozzle constant. A discharge amount control device is known.

(Problems to be Solved by the Invention) Generally, in a vehicle body coating line, spray coating is performed by an automatic coating machine separately on the upper surface and the side surface of the vehicle body. Then, in this case, as shown in FIG. 9, in order to secure a predetermined coating width w, as shown in FIG. 10, the top gun b with respect to the traveling direction of the vehicle body W mounted on the carrier a and moving. Painting is performed while reciprocating the paint spray nozzles of the side guns c and c in the lateral direction (right angle direction). Therefore, the relative movement of the paint spray nozzles of the guns b and c with respect to the vehicle body W is
As shown in the figure, the vibration waveform has a period of 2 to 3 seconds.
Then, at both ends of the horizontal movement range of each nozzle, the discharge of the paint is stopped so that the double spraying and the discarding spray do not occur, and a paint cut region as shown by hatching is formed. Therefore, since the flow of the paint forms a pulse train composed of a plurality of step-like pulses that sharply rises and falls sharply, it is difficult to precisely control the discharge amount of the paint with the above-mentioned device.

Further, usually, in the coating line of the vehicle body W, the vehicle bodies W having different coating colors are mixed, and the vehicle bodies having the same coating conditions such as the coating color and the paint discharge amount are not necessarily continuous.
Since it is often carried in intermittently, there is also a problem that coating variations easily occur between coating cycles under the same conditions.

In particular, when the upper surface of the vehicle body W is painted, the area of the painted area is different for the bonnet, roof and trunk lid, and there is a difference in height between these painted areas. When the coating material discharge amount is set to the same, the coating amount becomes small and the coating film thickness becomes thin when a large area or a low area is coated. On the other hand, when a narrow area or a high area is painted, the amount of paint adhered increases and the coating film becomes thick. In this way, the film thickness of the coating film changes depending on the width and height of each coating area.

The present invention has been made in view of the above points, and an object of the present invention is to set the discharge amount of a coating gun for spraying a coating object onto the object to be coated divided into a plurality of coating areas to each of the objects to be coated. By taking appropriate measures to vary according to the painting area, the automatic painting machine produces multiple painting flow pulses per painting cycle, such as spray painting of the car body as described above. Also, even in a coating line in which objects to be coated are mixed, which have different coating colors or the width and height of each coating area are different, the amount of paint is properly discharged according to the area of each object to be coated. Therefore, it is intended to make the coating film uniform on the object to be coated.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the solution means of the present invention causes a plurality of paint flow pulses per one coating cycle in an automatic coating machine, thereby causing a plurality of paint flow pulses. When coating the object to be coated divided into the coating area, measure the paint flow rate in each of the above paint flow pulses,
The object is a paint discharge amount control device which compares the measured data with a reference value and corrects and controls the discharge amount of the paint from the automatic coating machine based on this comparison. In this case, the paint flow rate is corrected for all of the above paint flow pulses, the discharge amount is changed for each coating area of the object to be coated, and the correction data value of the final paint flow pulse in each coating area is set. The discharge amount control means used as the initial value of each coating area in the next coating cycle is provided.

(Operation) With the above configuration, according to the present invention, when automatic coating is performed on an object to be coated divided into a plurality of coating areas, data correction is performed for all of a plurality of coating flow pulses, so that precise ejection is performed. The amount can be controlled, and the coating film can be made uniform. In addition, the final paint flow pulse correction data value for each paint area in this painting cycle, that is, the data value of the most stable paint flow state, is the same condition for the next time (paint color and number of paint areas).
Since it is used as the initial value of each coating area in the coating cycle of, even if the coating line mixes with different coating colors, or where there are differences in width and height in each coating area, It is possible to properly discharge the paint by an amount corresponding to each coating area, so that the variation in the discharge amount between the coating cycles can be reliably eliminated, and the coating film on the object to be coated can be made uniform.

(Examples) Examples of the present invention will be described below with reference to the drawings.
Prior to the description, a spray coating method for an object to be coated by an automatic coating machine, which is a premise of the present invention, will be briefly described.

FIG. 11 shows the top surface (to
p) shows the spray painting area by the automatic painting machine, in the figure, the reference sign is the paint OFF area corresponding to the front and rear windows of the body W, and the paint ON area corresponding to the hood, roof and trunk lid of the body W (First to third coating areas).

FIG. 6 is a waveform diagram showing the relationship between the output signal of the mass flow meter and the paint discharge amount during the operation of the automatic coating machine when painting the upper surface of the vehicle body W. FIG. It is shown that 12 paint flow pulses form one paint cycle (60 seconds) when painting the.
Then, in this embodiment, the pulse width τ ₁ of each paint flow pulse when the upper surface of the vehicle body W is painted is 2.71 seconds and the pulse period τ.
₂ is set to 4.05 seconds respectively.

FIG. 1 is a configuration diagram showing a configuration of a paint discharge amount control device according to an embodiment of the present invention, in which 1 is an automatic processor main body arithmetic processor, 2 is a microcomputer, and 3 is a paint supply passage 21.
The paint discharge nozzles 4 provided at the downstream end of the paint flow passage 21 are mass flowmeters provided in the middle of the paint supply passage 21. As shown in FIG. 3, the mass flowmeter 4 includes a sensor unit 5, an electronics box unit 6, a mass flow rate digital monitor 7 and a temperature / density digital monitor 8, and the mass of the paint detected by the sensor unit 5 is measured. A signal representing the flow rate is processed by the electronics box section 6 and output to the microcomputer 2.

On the upstream side of the mass flow meter 4, an air operation regulator (hereinafter, simply referred to as an air operation regulator) 9 that controls the flow rate of the paint is provided.
The air-operated regulator 9 is operated by an air signal from an electro-pneumatic converter 10 which converts an output signal from the microcomputer 2 into an air signal. As shown in FIG. 4, the electro-pneumatic conversion device 10 includes a fixed pressure reducing valve 11 for reducing the air pressure supplied from an air supply source, and the fixed pressure reducing valve.
Using the air pressure reduced at 11, the microcomputer 2
From the electro-pneumatic converter 12 that outputs an air signal proportional to the 8-bit parallel digital signal input from the electro-pneumatic converter 12, and the air signal output from the electro-pneumatic converter 12 is amplified. It is composed of a variable ratio relay 13 for operating the air operation regulator 9.

On the other hand, a color change valve group 14 is arranged on the upstream side of the paint supply passage 21. This color change valve group 14 includes color change valves 14 _A to 1 for each paint color.
4 _N , these color change valve groups 14 _A ~ 14
_N are respectively connected to the paint supply pipe 16 _A ~ 16 _N via the corresponding regulator 15 _A to 15 _N of the regulator group 15. Also, in the color change valve group 14,
A valve 14 _O connected to the cleaning thinner supply pipe 17 via the regulator 15 _O and a valve 14 _P connected to the air supply pipe 18 via the regulator 15 _P are provided respectively. Further, in the paint supply passage 21, a paint ON / OFF switching valve 20 is provided between the paint discharge nozzle 3 and the mass flowmeter 4.

In the above configuration, the signals representing the paint color and the number of paint areas output from the automatic processor main processor 1 are:
It is taken into the microcomputer 2 together with a signal representing the paint density. At the same time, the automatic processor main body processing unit 1 opens the color change valve for the set paint color (this color change valve is, for example, the valve 14 _J for painting the upper surface of the vehicle body W). Here, since the microcomputer 2 scans the air-operated regulator 9 via the electro-pneumatic conversion device 10, the paint begins to flow into the paint supply passage 21. This paint is supplied from the selected paint supply pipe 16 _J to regulator 1
Paint supply passage 2 via 5 _J and color change valve 14 _J
1, and is discharged from the paint discharge nozzle 3 toward the upper surface of the vehicle body W through the air operation regulator 9 and the mass flowmeter 4. The mass flowmeter 4 detects the mass flow rate under a certain set condition as described later and detects the mass flow rate.
Give feedback to. As described above, the microcomputer 2, the electro-pneumatic conversion device 10, the air operation regulator 9 and the mass flowmeter 4 form a loop to correct the deviation of the paint discharge amount.

By the way, when the mass flowmeter 4 detects a paint flow pulse which rises in a stepwise manner as shown in FIG. 6 (b), the responsiveness of the mass flowmeter 4 becomes a problem. FIG. 5 is a diagram showing the responsiveness of the mass flowmeter 4 to the flow of paint, where the vertical axis is E / E _O and the horizontal axis is time. E
Is the output of the mass flow meter 4, and E _O is the output of the mass flow meter 4 converged to the step input. Referring to FIG.
It can be seen that this mass flowmeter 4 follows the step input with a delay of 0.2 to 0.3 seconds.

FIG. 6 (a) shows an output signal pulse of the mass flowmeter 4 corresponding to the paint flow pulse of FIG. 6 (b), which is assumed in consideration of the response of the mass flowmeter 4 described above. In the present embodiment, the flow rate correction is performed for all the paint flow pulses in FIG. 6 (b) based on this output signal, but the description of FIG. 6 (a) will be given together with the operation of the microcomputer 2. It will be described later.

The contents of the processing executed by the microcomputer 2 are shown in FIGS. 7 (a) and 7 (b), and in terms of time, an initial process (see FIG. 7 (a)) and a correction process (see FIG. 7 (b)). ) And FIG. 6 (a)) and the correction data storage process. Below, each of these processes
This will be described with reference to the drawings and FIG.

(Initial Process) When the vehicle body W is carried into the coating booth 22 of the coating station along the conveyor, the operator operates the operation panel 23, whereby the coating color information of the vehicle body W is calculated by the automatic coating machine body. It is input to the processor 1. Next, the vehicle body W is the operation panel
.. are arranged at the downstream side of 23, and vehicle type classification information such as the number of painting areas is input to the automatic painting machine main processing unit 1 by this. Then, while the vehicle body W is carried in to the position of the top gun 25 for painting the upper surface thereof, setting signals such as the painting color and the number of painting areas are inputted from the automatic painting machine main body arithmetic processing unit 1 to the microcomputer 2. At the same time, the arithmetic processing unit 1 of the main body of the automatic coating machine sets the color change valve 14 _J of the set coating color.
open. At this time, the signal taken in by the microcomputer 2 is processed as follows.

(1) Read the density D _S according to the coating color from the density table, multiply this density D _S by the discharge amount Q _V (volume flow rate) set according to each coating area, and convert it to the mass flow rate. Hold. _Let this mass flow rate be Q _M (Q _M = D _S · Q _V ).

(2) The electro-pneumatic conversion value K of the previous painting cycle corresponding to the coating color and the discharge amount is read from the electro-pneumatic conversion value storage table, and the electro-pneumatic conversion value K is used as an initial value for the electro-pneumatic conversion device. Output to 10 and start the paint flow. The electric / pneumatic conversion value K is an integer and has a value of 0 ≦ K ≦ 255 (decimal number).

This initial process aims to wait for the output signal of the mass flowmeter 4 to stabilize.

(Correction process) When the microcomputer 2 receives the discharge ON signal for the first paint flow pulse in the first coating area from the automatic coating machine main processing unit 1, it starts the flow rate correction process for this paint flow pulse. . At this time, the signal taken in by the microcomputer 2 is processed as follows.

(1) the time when receiving the discharge ON signal in an automatic coating machine main body processing machine 1 time t ₁ than from the time t ₁ to wait for stabilization of the ejection amount, the set time tau _O seconds elapsed advance
Wait until t ₂ .

(2) Sampling frequency fH from time t ₂ to time t ₃
The output signal of the mass flowmeter 4 is sampled with z and the sampling number S.

(3) Calculate the average value of the sampled data to obtain the average mass flow rate _MS .

(4) This average mass flow rate _MS is compared with the mass flow rate set in the initial process, and Y = _MS / Q _M is calculated.

(5) It is determined whether Y is within the allowable range.

(6) When the Y value is within the allowable range, the electro-pneumatic conversion value K is held as it is, and when it is outside the allowable range, the electric / pneumatic conversion value K is maintained.
A correction is added to the sky conversion value K. If the electric / pneumatic conversion value correction amount is ΔK and the correction value is T, then T = K when Y> 1.
−ΔK, and when Y <1, T = K + ΔK.

(7) Judge the validity of the value of T. If it is valid, that is, if 0 <T <255, the value of K is replaced with T.
If T ≦ 0 or T ≧ 255, the value of K is not corrected.

(8) The value of K is output to the electro-pneumatic conversion device 10 to substantially correct the amount of paint discharged.

(9) The value of K in the electric / pneumatic conversion value table is rewritten.

(10) Even if the discharge OFF signal is received at time t ₄ , the automatic coating machine R
As long as the UN signal is ON, the above processing is performed based on the pulse of the subsequent output signal. Such processing is the first
The same applies to the first painting area (bonnet), the second painting area (roof), and the third painting area (trunk lid), which are denoted by reference numerals in FIG.

(11) The electric / pneumatic conversion value storage table is rewritten each time with the corrected electric / pneumatic conversion value for each paint flow pulse.

(Correction data storage process) Automatic coating machine at time t ₉ of the last (fourth) output signal pulse in the first coating area (bonnet)
When it is detected that the RUN signal has turned off, the following processing is performed. The automatic coating machine RUN signal is shown in Fig. 6 (c).
As shown in, the discharge is turned off before the discharge off signal is output, but during this period, the operation of the automatic coating machine is held for a predetermined time by the self-holding circuit.

(1) Correction voltage / based on the final output signal pulse
The empty conversion value is stored in the electric / empty conversion value storage unit. The second
Similarly in the painting area (roof) and the third painting area (trunk lid), time t _{9 of the} final output signal pulse.
When it is detected that the RUN signal of the automatic coating machine has been turned off in, the 6th output signal pulse in the 2nd coating area (roof) and the 2nd in the 3rd coating area (trunk lid) The corrected electro-pneumatic conversion value obtained based on the output signal pulse of 1 is stored in the electro-pneumatic conversion value storage unit.

(2) When all the corrected electro-pneumatic conversion values in the first to third coating areas on the upper surface of the vehicle body W are stored in the electro-pneumatic conversion value storage unit in this way, K = 255 is stored in the electro-pneumatic conversion device 10. Is output, and the air operation regulator 9 is fully opened. Next body W
If the paint color is different from this time, the residual paint in the paint supply passage 21 is discharged and the paint supply passage using the cleaning thinner is used.
The inside of 21 needs to be cleaned. Therefore, the paint supply passage 21
In order to reduce the flow resistance of the paint inside, the air operation regulator 9 is fully opened.

(3) When receiving the signal of the cleaning process end from the automatic coating machine main processing unit 1, the electric / pneumatic conversion value K is sent to the electric / pneumatic conversion device 10.
= 0 is output to fully close the air-operated regulator 9. If the coating color of the vehicle body W for the next time is the same as this time, the above cleaning step is omitted, but an apparent cleaning end signal is received to close the air operation regulator 9.

(4) One cycle of the painting process is completed, and the vehicle waits for the next vehicle body W. When the coating on the upper surface of the vehicle body W is completed as described above, subsequently, the side guns 26, 26 arranged on the downstream side of the top gun 25 are used to coat the side surface of the vehicle body W as described above.

8 (a) to 8 (c) are flowcharts for explaining the processing procedure executed by the microcomputer 2 described above in more detail.

First, in step S ₁ after the start of FIG. 8A, it is determined whether or not a correction 1-cycle start signal is received. If the determination is YES, that is, if the correction 1-cycle start signal is received, the process proceeds to steps S _{2 to} S ₄ to read the vehicle type i and the coating color j, and to display the number of coating areas F.
Set (i). On the other hand, if the judgment is NO that the correction 1 cycle start signal is not received, the correction 1
Wait until the cycle start signal is received.

Next, in step S ₅ , the density D of the paint corresponding to the paint color is read from the density table in the microcomputer 2.
_S (j) is read out and set, and then, in step S ₆ , K = 0 is output to the electro-pneumatic conversion device 10 to fully close the air-operated regulator 9. Then, in step S ₇ , initialization is performed to set the area coating number parameter k to zero, and in the next step S ₈ , it is determined whether the area coating number parameter k is k ≦ F (i). . If this determination is k ≦ F (i), vehicle type proceeds to step S ₉ of FIG. 8 (b), the discharge amount corresponding to the paint color and the number of coating areas (volume flow) Q _V (i, j, while setting k), if the determination is k> F in (i), step S fully open the air-operated regulator 9 outputs a K = 255 to proceed in electric / pneumatic converter device 10 to step S ₃₃ Return to ₁ and wait for the next body W to be loaded into the coating booth 22.

Further, in step S _10, the microcomputer 2
The electric / pneumatic conversion value K _S (i, j, k) corresponding to the vehicle type, the paint color and the number of painting areas is read out from the electric / pneumatic conversion value storage table in the table and set. Then, in step S ₁₁ , the volume flow rate Q _V
(I, j, k) is multiplied by the density D _S (j) to convert it into the mass flow rate Q _M. Then, in step S ₁₂ , the electro-pneumatic conversion device 10
The outputs _{K = K S (i, j} , k), the reciprocating parameters sprayer proceeds to step S ₁₃ performs initialization to L = 0 and ends the initial process described above. The automatic painting machine is RUN
Even if the signal turns off midway, it always reciprocates and stops at a fixed position.

Then, the time of the step S ₁₄ of FIG. 8 (c) determines whether it has received a coating material delivery ON signal, if YES the determination receives the coating material delivery ON signal (FIG. 6 (a)
t ₁₎ whereas waits τo seconds proceeds to step S _15, in the case of NO where the determination is not receiving the coating material delivery ON signal and waits for reception of paint discharge ON signal. And step S
₁₅ determines whether elapsed τo sec, mass flowmeter 4 proceeds to step S ₁₆ in the case of YES where the determination has elapsed τo seconds
The output samples the discharge amount (Figure 6 to the time point t ₂ ~t ₃ of (a), the sampling frequency fHz, sampling number S) on the other hand, in the case of NO where the determination has not elapsed τo seconds τo seconds Wait until the time has passed.

Then, in step S ₁₇ , the average mass flow rate of the sampling results, that is, the average discharge amount _MS is calculated. Then, in the next step S ₁₈ , Y = _MS / Q _M is calculated for evaluation of the sampling data, and in the next step S ₁₉ , it is determined whether or not this Y is within the allowable range. While this determination is corrected in step S ₂₀ to proceed in electric / pneumatic converter value K in the case of NO where Y is outside the allowable range, if the determination is YES which Y is within acceptable limits without correction willing outputs the value of the K electrostatic / empty converter 10 to step S ₂₆ in. Step S
A judgment _20, Y is greater than or less than 1 1, when Y <1 corrects the correction amount ΔK added electrodeposition / air conversion value K to a value of K proceeds to step S ₂₁ ( T =
K + ΔK). On the other hand, Y> 1 when the correcting the willing value from the correction amount [Delta] K is decremented by electrodeposition / air conversion value K of K in step _{S 22 (T = K-ΔK} ). Next, it is determined whether T in step S ₂₃ to evaluate the correction-possibility is in the range of 0 <T <255. The routine proceeds to step S ₂₅ in the case of YES this determination is within the range of 0 <T <255 K = T ( correctable) ungated, T
≦ 0 or K = K proceeds to step S ₂₄ when the T ≧ 255
(Uncorrectable) Then, outputs K electrodeposition / pneumatic converter device 10 in step S _26, this time with rewriting the electric / pneumatic converter value table in the next step S ₂₇ the correction electric /
Stores the empty conversion value.

Then, a judgment of whether or not it has received a discharge OFF signal in step S _28, the reciprocating parameters sprayer (time t ₄ in FIG. 6 (a)) If YES the determination receives a discharge OFF signal Is L = 1 or L = 0.
This determination is in the case of L = 1 to evaluate the automatic coating machine RUN signal goes to step S _31. On the other hand, the process returns to step S ₁₄ and if the determination is L = 0 is incremented reciprocating parameters sprayer proceeds to step S ₃₀ to L = L + 1, step S ₁₅ to S ₂₇ for the next paint flow pulses The correction process of is repeated. Furthermore, the process returns to step S ₁₃ when the automatic coating machine RUN signal is ON it is determined that the coating of the first coating area is not yet finished in step S _31, the next initializes the reciprocating parameters repeating the correction process of step S ₁₄ to S ₂₇ with respect to paint flow pulse. On the other hand, when the automatic painting machine RUN signal is OFF, it is determined that the painting of the first painting area is completed, the process proceeds to step S ₃₂ , the area painting number parameter is incremented to k = k + 1, and the process returns to step S ₈ . The subsequent processing is repeated. And, the above-mentioned area coating number parameter is k> F
It becomes a (i), the at electric / pneumatic converter device 10 step S ₃₃ K
= 255 is output, the air operation regulator 9 is fully opened, and the process returns to step S ₁ to wait for the next time the vehicle body W is loaded into the coating booth 22.

The above is the microcomputer 2 for the first coating area
Is a processing procedure executed by the above, and is similarly performed for the second and third coating areas.

Thus, step S ₁₃ to S in such processing procedure described above
When performing automatic painting on the vehicle body W divided into a plurality of painting areas by ₃₃ , the paint flow rate is corrected for all of a plurality of (12) paint flow pulses generated in one painting cycle, and A discharge amount in which the discharge amount is changed for each coating area of W and the correction data value of the final paint flow pulse in each coating area is used as the initial value of each coating area in the next coating cycle. The control means 27 is configured.

Therefore, in the above embodiment, 12
Since the flow rate correction is performed for all individual coating flow pulses, it is possible to make the coating film uniform. Also,
The last of each coating area in one coating cycle, that is, the fourth coating area in the first coating area (bonnet), the sixth coating area in the second coating area (roof), and the third coating area (trunk lid) If so, the correction data for the second coating flow pulse is used as the initial value for the next coating cycle (the next coating cycle with the same coating color and number of coating areas), so variations between coating cycles are reliably eliminated. be able to.

In the above embodiment, the case where the object to be coated is the upper surface of the vehicle body W of the automobile has been shown, but the present invention is not limited to this, and can of course be applied to other objects to be coated, and the coating area is 2
It may be one or four or more.

(Effects of the Invention) As described above, according to the present invention, when automatic coating is performed on an object to be coated divided into a plurality of coating areas, data correction is performed for all of a plurality of coating flow pulses. Therefore, it is possible to precisely control the discharge amount and to make the coating film uniform. In addition, the correction data value of the final painting flow pulse for each painting area in this painting cycle, that is, the data value when the paint flow state is the most stable, is used for the next painting under the same conditions (paint color and painting area). Since it is used as the initial value of the cycle, it is possible to surely eliminate the variation in the discharge amount between the coating cycles.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a paint discharge amount control device, FIG. 2 is a schematic configuration diagram of a coating station for coating an automobile body, and FIG. 3 is a mass flow meter. Fig. 4 is a block diagram of the electro-pneumatic converter, Fig. 5 is a graph showing the output response characteristics to the step input of the mass flow meter, and Fig. 6 is an automatic painting machine for painting the upper surface of the vehicle body. Waveform diagrams showing the relationship between the output signal of the mass flowmeter and the amount of paint discharged during operation, FIGS. 7 (a) and 7 (b) show the contents of processing executed by the microcomputer and the flow of each signal. Explanatory drawings, FIGS. 8 (a) to 8 (c) are flowcharts showing the processing procedure executed by the microcomputer, and FIGS. 9 and 10 are for explaining the movement of the paint discharge nozzle of the automatic coating machine. Illustration of the 11th
The figure is a diagram showing a coating area on the upper surface of the body of an automobile. 1 ... Automatic coating machine main processing unit, 2 ... Microcomputer, 3 ... Paint discharge nozzle, 4 ... Mass flow meter,
9: Air operated regulator, 10: Electro-pneumatic conversion device,
14 …… Color change valve group, 15 …… Regulator group, 16 …… Paint supply piping group, 17 …… Thinner supply piping, 18
...... Air supply piping, 20 …… Paint ON / OFF switching valve, 2
7: Discharge rate control means, W: Vehicle body.

Claims (1)

[Claims] 1. An automatic coating machine, wherein a plurality of paint flow pulses are generated per coating cycle, whereby
When coating an object to be coated divided into multiple coating areas, measure the paint flow rate in each of the above paint flow pulses, compare this measurement data with a reference value, and based on this comparison, perform the above automatic painting. A paint discharge amount control device for correcting and controlling the discharge amount of paint from the machine, correcting the paint flow rate for all the above paint flow pulses and changing the discharge amount for each coating area of the above-mentioned coated object. In addition, the paint discharge amount control means is provided with a discharge amount control means for using the correction data value of the final paint flow pulse in each paint area as the initial value of each paint area in the next paint cycle. apparatus.