JPS6145500B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating material injection control device for controlling the coating material injection position with respect to an object to be coated in a coating apparatus in which a coating machine is reciprocated.

Various types of control devices have been proposed as this type of control device. For example, a pair of reed switches are installed at desired positions in the moving path of the paint sprayer, and the signals from these switches control the on/off of the paint sprayer's spraying material, and when the first switch is turned on, the spraying material is sprayed. There is a type that starts the spraying and then stops the spraying with the next switch, but with this type there is a delay time between when the switch signal is obtained and when the coating material is actually sprayed or stopped. It has the disadvantage that it is not possible to accurately regulate the amount of paint, and that there is a shift in the coating range between the forward and backward movements, making it troublesome to adjust. In order to improve this, a model that is equipped with a cam that responds to the movement of the paint sprayer has been proposed, but this also has trouble adjusting the position of the cam and cannot be easily adjusted, requiring skill. However, it is difficult to add the number of control stages, and the installation location is limited.

Furthermore, there is a drum control method, but this method allows the number of control stages to be adjusted steplessly, but it has the disadvantage of requiring adjustment, and in any case, it is small and does not require skill, and it is easy to create or change the coating pattern. There was no equipment available to do so.

The present invention provides a device for accurately controlling the paint spraying period of a paint sprayer that repeatedly moves back and forth over a predetermined painting area depending on the shape of the object to be painted, that is, the desired painting area. At the same time, each output terminal of the shift register is made to correspond to the division, and the clock pulses of the shift register are set to be the same number as the number of divisions within the movement period of the paint sprayer, and furthermore, the clock pulses are generated every movement period of the paint sprayer. The reference position signal thus obtained is used as data input to the shift register to accurately maintain the paint (coating material) injection position of the coating machine, and a switch is connected to each output terminal of the shift register, and each switch is used to control the coating of the object to be coated. By setting the coating according to the surface, it is possible to appropriately coat various objects to be coated.Examples of the present invention will be described below with reference to the drawings.

In the figure, 1 turns on and off paint discharge using compressed air.
This is a paint sprayer that performs off-control, in which paint is supplied from a paint supply source 2 and air is supplied from a compressed air supply source 3 via a solenoid valve 4 that is opened and closed by a control circuit to be described later. Paint is injected onto the object to be painted only when the solenoid valve 4 is opened and air is supplied.

Reference numeral 5 denotes a transfer mechanism for reciprocating the coating machine 1, in which, for example, an engaging pin 9 is fixed between a pair of sprockets 7 and 8 which are arranged a required distance apart in the vertical direction, and a chain 10 is stretched. One or both sprockets are connected to a motor (not shown) and driven to rotate in one direction. Thus, the engaging pin 9 is engaged in the horizontal slit 12 of the sprayer support 11 which is guided and supported so as to be slidable in the vertical direction, and by driving the chain 10, the sprayer support 11 and thus the sprayer are moved. 1 moves back and forth.

Reference numeral 15 denotes a sprayer position detection means installed in the middle of the sprayer's stroke, for example at the lowest position, and the detection output is used as data input of a shift register to be described later.
This serves as a reference position signal SD generation means for associating the sequential output of the shift register with the position of the paint sprayer.

The coating area facing the spray machine (gun) is divided into sections at approximately equal intervals in the stroke direction of the spray machine (80 divisions in the reciprocating stroke in the figure), and the shift register 20 is composed of the same number of bits as the number of divisions. Each bit has its own output terminal.

The clock pulse CP of the shift register 20 is supplied from the pulse generator 16, and its pulse period is set to be the same as the number of divisions within one reciprocating period (period) of the paint sprayer.

The shift register 20 receives the reference position signal SD.
The register at the first stage is set by , and thereafter it is sequentially shifted every time the clock pulse CP arrives, and an output of "1" is obtained in a binary display that is sequentially shifted from the output terminals t ₁ , t ₂ . . . t ₈₀ .

Reference numeral 22 denotes a pattern selection switch circuit, which includes locking selection switches _{S 1 ,} S _{2 . .} . , B, C), and the other ends of the switches _{S 1 to S 80 of each} switch group are connected in common to form a pattern selection switch SS.
It is connected to the.

A relay 25 is connected to the output side of the pattern selection switch SS, and when a pattern output is obtained through the selection switch SS, it is energized and opens the solenoid valve 4 interposed in the air supply system.

In the apparatus of the present invention, the selection switches S ₁ to _{S 80} of the pattern selection switch circuit 22 are locked in the closed state depending on the area to be painted of the object to be painted. For example, to set patterns A, B _{, and} C shown side _{by side} in FIG. are switches S ₃ to _{S 12} and S ₃₁ to S ₃₃ and S ₄₂ to S ₅₀ and S ₆₉ of switch group SW2.
~ Close S ₇₈ , switch group for pattern C
SW3 switches S ₁₃ ~ S ₁₈ and S ₂₅ ~ S ₃₂ and S ₄₉ ~
Set _S56 and _S63 to _S68 closed.

When painting pattern A, the selection switch SS is switched to switch group SW1, and the shift register 20 is reset.If the sprockets 7 and 8 are rotated clockwise in this state, the injection gun 1 is turned on. It starts to descend from the position shown by the solid line, and since the detection signal SD is not obtained from the detection switch 15 at this time, an output of "0" is obtained from each output terminal of the shift register 20 on a binary display, and therefore the relay 25 is not connected. The electromagnetic valve 4 remains closed and no paint is sprayed from the coating machine 1.

When the paint sprayer 1 contacts the detection switch 15 and turns it on, the detection signal SD sets the first stage register of the shift register 20, thereby obtaining an output of "1" from the terminal _t1 . . However, since the switch _S1 of the switch group SW1 is open, the relay 25 is not energized and the solenoid valve 4 remains closed. At the same time, the coating machine 1 starts to rise. From then on, each time the clock pulse CP arrives, a shift output of "1" is obtained from the output terminals t ₂ , t _{3 .} . . , and when an output is obtained from the output terminal t ₅ , the switch S ₅ of the switch group SW 1 is closed. Therefore, relay 25 is energized, solenoid valve 4 is opened, and sprayer 1 is activated.
Paint is sprayed from. Afterwards, by closing switches S ₆ to _{S 37} , paint is sprayed continuously.
Then, the spraying is stopped from the switch _S38 position, and the desired pattern A is obtained, and after the sprayer 1 reaches the top, it begins to descend, and while the sprayer 1 is at the switch _S45 to _S75 position, the sprayer 1 is turned off again. Paint is injected from the paint to obtain pattern A in the same manner, and this operation is repeated every time a detection output is obtained from the detection switch 15.

Similarly, to obtain other patterns B and C, it is sufficient to switch the selection switch SS to the switch group SW2 and SW3 side.

In the above explanation, it was assumed that there is no delay time between when the solenoid valve 4 opens (or closes) and when the paint is injected (or when the paint stops being injected), but there is a case where there is a delay time. To do this, all you have to do is shift the set positions of the switches in the switch group accordingly.

As described above, according to the device of the present invention, since the paint injection position is controlled using a sequential shift circuit, setting and changing the injection position is extremely easy as it is only necessary to open and close a switch. Not only does it require no skill, it can be easily miniaturized without employing a mechanical mechanism, and the number of control stages can be increased by simply increasing the number of shift stages in the shift circuit and adding switches in the pattern selection switch circuit, making it extremely easy to use. It is easy to use, can eliminate the drawbacks of conventional devices, and even coating devices that use conventional control devices can be replaced with the device of the present invention by simply installing a detection switch. It has great characteristics.

In the above example, we have explained the case where one shift register is divided into two to control the paint jetting during the reciprocating motion of the paint sprayer 1, but it is also possible to add a set of detection switch, shift register, and pattern selection switch circuits. However, the detection switch may be disposed at the uppermost position to control paint spraying during the backward movement of the coating machine 1.

Next, a second embodiment of the device of the present invention will be explained with reference to FIG. 2. This example is applied to an automatic painting machine that determines the shape of the object to be painted and selects the paint spray area accordingly. In this case, the switch of the pattern selection switch circuit is composed of an active electronic switch such as a transistor instead of a mechanical switch, and the opening and closing of the switch is controlled by the output of a memory circuit that discriminates and stores the shape of the object to be coated. do.

That is, 30 is a suspended conveyor for conveying the object to be coated, and is transported by a motor 31, and the object to be coated 33 is suspended from a hanger 32 and conveyed.

Reference numeral 35 denotes a coating device main body disposed on one side of the conveyor 30, which is movable forward and backward with respect to the conveyor 30 by a cylinder 36, and includes coating machines 37 and 38 that reciprocate as shown in FIG. For example, two sets are provided facing the conveyance path of the object 33 to be coated.

Reference numeral 35 denotes a coating device main body having the same configuration as the coating machine main body 35, and is disposed at a position trailing the main body 35 with respect to the conveyor transport direction and on the opposite side of the conveyor.

Reference numeral 40 denotes an object detection means disposed at a position preceding the coating apparatus main body 35 in the conveyor transport direction, and for example, detects the object to be painted in the traveling direction of the object 33, which includes a pair of light-emitting elements 41 and a light-receiving element 42, respectively. It has a depth detection section 43 in a direction orthogonal to the object to be coated, and height and width detection sections 44, 45, and 46 for the object to be coated, and each detects a pattern detection signal according to the shape of the object 33 while it is arriving. is obtained.

A conveyor synchronous pulse generator 48 is connected to the rotating shaft of the sprocket 34 of the conveyor 30 and generates a synchronous pulse SP corresponding to the conveyance of the conveyor.

50, 51, 52 are detection units 44, 45, 4, respectively.
pattern detection signal from 6 and pulse generator 48
The workpiece height pattern memory circuit is supplied with synchronization pulses from the machine and is composed of, for example, a shift register, in which the memory contents are set to ``1'' or ``0'' on a binary display by a detection signal. synchronous pulse
The outputs M1, M2, and M3 are sequentially shifted each time SP arrives, and when the object 33 to be coated reaches the position of the coating apparatus main body 35 from the detection means position, outputs M1, M2, and M3 are obtained.

60, 61, 62 are pattern memory circuits 5, respectively.
Outputs 0, 51, and 52 are supplied, and outputs SD1 and SD2 of paint machine position detection switches 65 and 66 are supplied.
For example, as shown in FIG. 3, the fabric material ejection control circuit includes a clock pulse generation circuit 67 having the same configuration as in FIG. 1, a shift register 68, a pattern signal forming circuit 69, and a pattern signal forming circuit. Output of circuit 69 and storage circuit 50,5
The AND circuit 70 is supplied with outputs of 1 and 52, and the paint injection control output CS is supplied from the AND circuit 70.
1, CS2, and CS3 are obtained.

The paint injection control output CS1 is supplied to the solenoid valve 71 interposed in the air supply line of the sprayer 37 of the coating apparatus main body 35, and the control outputs CS2,
CS3 is supplied via an OR circuit 72 to a solenoid valve 73 interposed in the air supply line of the coating machine 38.

Reference numeral 75 denotes an object depth detection signal storage circuit to which the detection signal from the detection unit 43 and the synchronization pulse from the pulse generator 48 are supplied, and the storage circuit 50,
51 and 52, while the object to be coated 33 passes through the coating apparatus main body 35, a direction that is perpendicular to the traveling direction of the object to be coated and substantially coincident with the direction in which the coating machines 37 and 38 face each other. An output corresponding to the depth of the object 33 to be coated is obtained, which controls the electromagnetic switching valve 76 interposed in the air or hydraulic pressure supply line of the cylinder 36.

Also, regarding the coating machine body 35', the coating machine body 3
Circuits corresponding to the circuits 5 and 5 are provided as shown by the same reference numerals and dashes attached to the corresponding parts.
However, the memory circuits 50', 51', 52', and 75' receive the outputs of the memory circuits 50, 51, 52, and 75, and sequentially shift the outputs so that the object to be coated 33 is transferred to the coating apparatus main body 35.
The configuration is such that an output is obtained when the paint reaches the coating body 35'.

The above is the configuration of the second embodiment of the present invention,
The operation will be explained next. All the memory circuits have now been reset, and therefore the coating device main body 35,
35' is in the retracted position and paint is not being sprayed from the paint sprayer installed therein, that is, the paint spray gun. In this state, the object to be painted 33 is transferred by the conveyor 30 and detected by the detection means. When the 40th position is reached, each detection section 43, 44, 45
Detection outputs are obtained from the memory circuit 7, and these are respectively stored in the memory circuit 7.
5, 50, and 51. Note that no output is obtained from the detection unit 46 because the object to be coated 33 does not exist at that position. When the object 33 to be coated reaches the position of the main body 35 of the coating apparatus, the memory circuits 50, 51, 7
Output is obtained from 5. Meanwhile, the shift register 58 of each coating material injection control circuit 60, 61, 62,
The pattern signal forming circuit 69 is operated by the detection switch signals SD1 and SD2 as explained in FIG.
The memory circuits 50, 51, 52 until reaching the position
Since there is no output from the AND circuit 70, the paint injection control outputs CS1, CS2, and CS3 cannot be obtained.

When output is obtained from each memory circuit 50, 51, 75 in this state, each coating material injection control circuit 60, 6
An output is obtained from the AND circuit 70 of No. 1, and the coating device main body 35 is moved forward by the output CS4 of the memory circuit 75, and paint is sprayed from the coating machines 37 and 38 by the control outputs CS1 and CS2, and the object to be coated is sprayed. 33 is coated, and this continues until the object to be coated 33 passes through the coating machine body 35, and then the memory circuit 5
Since the outputs of 0, 51, and 75 cannot be obtained, and the control outputs CS1, CS2, and CS4 cannot be obtained accordingly, the coating device body 35 remains in that position, and the coating spray from the coating machines 37 and 38 stops. will be stopped.

Subsequently, when the object 33 to be coated reaches the position of the coating device main body 35', the main body 36' moves forward in the same way as described above, and paint is sprayed from the coating machines 37' and 38' to the other surface of the object 33 and the other side of the coating device 35'. Ru.

As described above, according to the second embodiment of the present invention,
In addition to obtaining the same effects as in the first embodiment, it is possible to perform coating according to the shape of the object to be coated, and a fully automatic coating system can be realized.

Incidentally, a large number of detection elements of the detection means may be added, or the object to be coated may be scanned by the detection elements, and each of the detection signals may be stored in a memory circuit, and the object to be coated 33 may be sent to the main body 35 and 35' of the coating apparatus from this memory circuit. When the position is reached, the stored contents are sequentially read out and the electronic switch of the pattern signal forming circuit is controlled by the readout output, thereby realizing a more complete automatic painting system.

Further, in the second embodiment, the means for transporting the object to be coated 33 may be a suspended conveyor or a conveyor for placing and transporting the object to be coated, and any other means of transport may be used.

Furthermore, the paint machine position detection switch 65, 66, 6
If the paint sprayers 37, 38, 37', and 38' are synchronized, that is, when one reaches the lower end, the other one also reaches the lower end. Can be omitted.

Furthermore, the coating machine itself in the first and second embodiments is not limited to the configuration of the above example, and may be other air atomization type coating machines or hydraulic atomization type coating machines (all including electrostatic coating type). , an electrostatic atomizing coating machine, a powder coating machine, etc. can be applied. Furthermore, coating materials include general organic solvent-based paints and water-based paints, as well as powder paints, water, oil, adhesives,
Drugs, short fibers, etc. can be applied. Furthermore, the moving direction of the coating machine is not limited to the vertical direction, but can be arbitrarily selected such as horizontal direction or diagonal direction.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing one embodiment of the present invention, Figure 2 is a system diagram showing an embodiment of the present invention.
The figure is a system diagram showing another example of the present invention, and FIG. 3 is a circuit diagram showing an example of the coating material injection control circuit. 1 is a paint sprayer, 4 is a solenoid valve, 15 is a detection switch, 16 is a clock pulse generation circuit, 20 is a shift register, 22 is a pattern selection switch circuit,
37, 37', 38, 38' are paint machines, 50,5
0', 51, 51', 52, 52' are object height pattern memory circuits, 60, 60', 61, 61',
62, 62' are coating material injection control circuits, 71, 73
is a solenoid valve.

Claims (1)

[Scope of Claims] 1. A paint sprayer that reciprocates over a certain painting area, the painting area is divided into an appropriate number in the stroke direction of the painting machine, and has output terminals of the same number as the number of divisions, a shift register to which the same number of clock pulses as the number of divisions are input within a movement period of the paint sprayer; and a reference position signal generating means for generating a reference position signal every movement period of the paint sprayer and inputting the signal to the shift register. , a coating apparatus characterized in that a switch connected to each output terminal of the shift register is configured as a coating pattern selection circuit, and paint injection control of the coating machine is performed by sequential outputs of the shift register. Paint injection control device. 2. The paint injection control device according to claim 1, wherein the paint injection from the paint sprayer is performed by opening and closing a solenoid valve for compressed air supplied to the paint sprayer.