JPS6356827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic coating device that paints a conveyed object to be coated by a coating machine facing the conveyance path thereof, and more specifically, The present invention also relates to an automatic painting device that detects the size of the object to be painted in a direction that substantially coincides with the facing direction of the paint sprayer and automatically controls the relative position of the paint sprayer to the object to be painted.

In general, in painting equipment, the painting distance between the object to be painted and the painting machine has an important effect on the painting finish. That is, when the coating distance is long, the coating film becomes thin, and when the coating distance is short, the coating film becomes thick and the paint flows down, and in either case, it is impossible to maintain good coating quality. Also, when using an electrostatic coating machine,
If the distance between the coating machine and the object to be coated is too close, there is a risk of sparks occurring. For this reason, it is desirable to maintain the coating distance at an optimal value determined according to the properties of the paint, the model of the coating machine, etc.

In view of the above, the present invention detects the size of the object to be painted in a direction perpendicular to the conveyance direction of the object to be conveyed and substantially coincident with the facing direction of the coating machine, and determines whether the object to be coated is at the position of the coating machine. An object of the present invention is to provide a new automatic coating device that maintains a coating distance substantially constant by controlling the position of a coating machine when the coating distance is reached.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 10 denotes a suspended conveyor for conveying the object to be coated, which is transported by a motor 11, and the object to be coated 13 is suspended from a hanger 12 and conveyed.

Reference numeral 15 denotes a coating device main body disposed on one side of the conveyor 10, which is movable forward and backward with respect to the conveyor 10 by a cylinder 16, and coating machines 17 and 18 that reciprocate up and down are used to coat objects to be coated. Two sets are provided facing the conveyance path. In this case, coating machine 1
Reference numerals 7 and 18 control the supply of compressed air and control the on/off of paint discharge by opening and closing solenoid valves 47 and 49, which will be described later.
Paint is sprayed onto the object to be coated only when 7 and 49 are open and air is supplied.

Detection switches 19 and 20 detect the arrival of the coating machines 17 and 18, respectively, and are turned on when the coating machines arrive near the detection switch mounting position to obtain detection outputs (SD1) (SD2).

Reference numeral 15' denotes a coating device main body having the same configuration as the coating device main body 15, and is disposed at a position behind the main body 15 in the conveyor transport direction and on the opposite side of the conveyor, and is disposed on the opposite side of the conveyor. Corresponding parts are shown with the same reference numerals and a dash.

Reference numeral 21 denotes an object detecting means disposed at a position preceding the main body 15 of the coating apparatus with respect to the conveyor transport direction, and includes, for example, a pair of light emitting elements 22 and a light receiving element 23, respectively. A depth detection section 24 for the object to be coated in a direction that is perpendicular to the direction and substantially coincident with the facing direction of the coating machines 17, 17', 18, 18'; and a height and width detection section 25, 26 for the object to be coated;
27, and a detection signal corresponding to the shape of each object to be coated is obtained while the object is arriving.

28 is a conveyor synchronization pulse generation period in which a synchronization pulse (SP) corresponding to the conveyance of the conveyor connected to the rotating shaft of the sprocket 14 of the conveyor 10 is generated.

30, 31, 32 are height detection units 25, 2, respectively.
6, 27 and a synchronization pulse from the pulse generator 28, the workpiece height storage circuit is composed of, for example, a shift register;
The memory contents set by the detection signal are sequentially shifted each time the synchronization pulse (SP) arrives, and when the object 13 to be coated arrives from the detection means position to the coating apparatus main body 15 position, outputs (M1) (M2) ( M3) is obtained.

40, 41, 42 are memory circuits 30, 31, 42, respectively.
The coating material injection control circuit is supplied with the output of No. 32 and the outputs (SD1) (SD2) of the paint sprayer position detection switches 19 and 20, for example, the second
As shown in the figure, a clock pulse generator 43 and a clock pulse (CP) of this clock pulse generator 43 are supplied and the detection outputs (SD1) (SD2) of the coating machine position detection switches 19 and 20 are obtained. A shift register 44 is supplied with shift signals obtained from each shift position of the shift register 44, which is sequentially shifted in response to the reciprocating motion of the coating machines 17 and 18, and generates a coating pattern signal corresponding to the shape of the object 13 to be coated. It has a pattern signal forming circuit 45 and an AND circuit 46 to which the output of the pattern signal forming circuit 45 and the output of the memory circuits 30, 31, and 32 are supplied, and the paint injection control output (CS1) (CS2) is supplied from the AND circuit 46. (CS3) is obtained.

The paint injection control output (CS1) is supplied to the solenoid valve 47 interposed in the air supply line of the sprayer 17 of the coating apparatus main body 15, and the control outputs (CS2) (CS3) are supplied to the OR circuit 48. Via paint machine 1
The air is supplied to a solenoid valve 49 interposed in the air supply line 8.

Reference numeral 50 denotes a painting object depth detection signal storage circuit to which the detection signal from the depth detection section 24 and the synchronization pulse from the pulse generator 28 are supplied, and the storage circuit 3
It has the same structure as 0, 31, 32, and the object to be painted 1
3 passes through the coating apparatus main body 15, an output corresponding to the depth of the object to be coated in a direction perpendicular to the direction of movement of the object to be coated and approximately coincident with the facing direction of the coating machines 17 and 18 is obtained. controls the electromagnetic switching valve 51 interposed in the air or hydraulic pressure supply line of the cylinder 16, moves the coating device main body 15 forward and backward, and in turn moves the coating machines 17 and 18 back and forth. The relative position of the object 18 to the object 13 to be coated is automatically controlled to be kept substantially constant.

Further, regarding the coating apparatus main body 15', circuits corresponding to the respective circuits of the coating apparatus main body 15 are provided so that corresponding parts are shown with the same reference numerals and dashes. However, the memory circuits 30', 31', 32', and 50' receive the outputs of the memory circuits 30, 31, 32, and 50, and sequentially shift the outputs so that the object 13 to be coated passes through the coating apparatus main body 15 before being coated. The configuration is such that an output is obtained when the device reaches the main body 15'.

The above is an example of the configuration of the apparatus of the present invention, and its operation will be explained next. All the memory circuits have now been reset, and therefore the coating apparatus main bodies 15, 15'
are in the retreat position and no paint is being sprayed from the paint sprayer or paint spray gun installed thereon, and in this state the object to be painted 13 is transported by the conveyor 10 and reaches the position of the detection means 21. Then, detection outputs are obtained from each of the detection units 24, 25, and 26, and these are sent to the storage circuits 50, 30, and 3, respectively.
1 is stored as "1" in binary representation, and is sequentially shifted as the object 13 to be coated is transported. Note that no output is obtained from the detection unit 27 because the painted object 13 does not exist at that position. When the object 13 to be coated reaches the position of the main body 15 of the coating apparatus, the memory circuits 50, 3
Output is obtained from 0,31. During this time, the shift register 44 and pattern signal forming circuit 45 of each control circuit 40, 41, 42 are operated by the detection switch signals (SD1) (SD2). Since there is no output from the memory circuits 30, 31, and 32 until reaching
(CS2) (CS3) cannot be obtained.

When output is obtained from each memory circuit 30, 31, 50 in this state, each coating material injection control circuit 40, 4
An output is obtained from the AND circuit 46 of No. 1, and the output (CS4) of the memory circuit 50 causes the applicator main body 15 to move forward to a predetermined coating distance, and the control outputs (CS1) (CS2) Painting machine 17,1
The paint is sprayed from 8 and coated on one side of the object 13 to be coated, and this continues until the object 13 passes through the main body 15 of the coating machine, and then the memory circuits 30, 31, 5
0 output cannot be obtained, and accordingly, the control outputs (CS1) (CS2) (CS4) cannot be obtained, so the coating device main body 15 moves backward or remains in that position, and the coating spray from the coating machines 17 and 18 stops. will be stopped.

Subsequently, when the object 13 to be coated reaches the position of the main body 15' of the coating device, the main body 15' moves forward in the same manner as described above, and paint is sprayed from the coating machines 17' and 18' to coat the other side of the object. .

In the above example, the case where the depth of the object to be coated 13 is symmetrical with respect to the conveyance path of the object to be coated is explained. The object to be painted is horizontally scanned and the detection signals are stored in separate depth detection signal storage circuits, and when the object 13 to be painted reaches the positions 15 and 15' of the main body of the coating apparatus, the stored contents are sequentially stored from this storage circuit. If the readout output is used to control the amount of forward and backward movement of the coating apparatus main bodies 15 and 15', more complete coating distance control can be achieved.

Furthermore, in the above example, the case was explained in which the coating machine was opposed from the side of the object to be coated, but the present invention is applicable to cases in which the coating machine is opposed from above or below the object to be coated, or even from diagonally. It should be understood that it can also be suitably applied.

In addition to the detecting means consisting of a pair of light emitting elements and light receiving elements described in the above example, the article detecting section of the present invention uses, for example, ultrasonic waves to measure the distance from the detection position to the object to be coated. A distance detection means may also be used, and any detection means may be employed.

Further, as the means for transporting the object to be coated 13, in addition to a suspended conveyor, a conveyor for placing and transporting the object to be coated may be used, and any transport means may be used.

Furthermore, the coating machines 17 and 18 themselves are not limited to the above-mentioned configuration, and may be other air atomization type coating machines, hydraulic atomization type coating machines (all including electrostatic coating types), or electrostatic atomization type coating machines. machine,
A powder coating machine etc. can be applied.

In addition to general organic solvent-based paints and water-based paints, coating materials include powder paints, water, oil, adhesives, chemicals,
Short fibers etc. can be applied.

As described above, according to the present invention, the size of the object being conveyed is detected by the object detection section, and this is stored in the memory circuit, and when the object to be painted reaches the position of the coating machine from this memory circuit, The coating machine position control output is obtained, and the coating distance between the coating machine and the object to be coated is automatically controlled to the optimum value, making it possible to reliably perform coating with consistent coating quality. It has the following characteristics.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the device of the present invention;
FIG. 2 is a circuit diagram showing an example of the coating material injection control circuit. 10 is a suspended conveyor, 13 is an object to be painted, 1
5, 15' are the coating device main body, 16, 16' are cylinders, 17, 17', 18, 18' are coating machines, 24 is a depth detection section, 28 is a conveyor synchronized pulse generator,
50 is a depth detection signal storage circuit.

Claims (1)

[Claims] 1. In an automatic coating device that paints a conveyed object to be coated by a coating machine facing the conveyance path thereof, the device is perpendicular to the direction of conveyance of the object to be coated and approximately parallel to the direction opposite to the coating machine. an article detection section that detects the size of the object to be coated in the same direction; a detection signal from the article detection section is supplied; An automatic painting apparatus comprising: a detection signal storage circuit that is sequentially shifted; and a position control means that controls the position of the coating machine relative to the object to be painted based on the output from the detection signal storage circuit.