JPH0194972A - Automatic painting method - Google Patents

Abstract

PURPOSE:To apply uniform and well painting to a large painting surface, by performing painting only during a time when a surface to be painted is raised with respect to a spray gun and stopping the operation of the spray gun at the falling time of the surface to be painted. CONSTITUTION:A spray gun 19 is moved left and right by a reciprocating apparatus and an article 20 to be painted is moved in an up-and-down direction by a lift apparatus. At the time, only during the falling of the spray gun 19, that is, only during a rising process wherein the article 20 to be painted intermittently or continuously rises with respect to the spray gun 19, the spray gun 19 is operated. By this method, possibility such that the surface already painted is contaminated with floating dust is reduced. Therefore, a relatively large surface to be painted can be uniformly painted and a finish surface becomes well.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic painting method, more specifically, an automatic painting method that can uniformly paint a relatively large surface and provide a good finished surface. Regarding.

Prior Art The inventor of the present invention has published Japanese Patent Application No. 60-293271 (Japanese Unexamined Patent Publication No. 62
No. 152,559) proposed an automatic coating device equipped with a reciprocating device and a moving device that operate using pressurized air.

This automatic painting apparatus includes a spray gun operated by pressurized air, a reciprocating device, and a moving device, and the spray gun is caused to reciprocate by the reciprocating device.

On the other hand, the object to be coated is moved by a moving device in a direction intersecting the moving direction of the spray gun. These reciprocating and moving devices are controlled by a counter section and a control section. - In this automatic coating device, the spray gun is arranged so as to face the object to be coated, and the spray gun is moved, for example, from side to side by a reciprocating device, so that the object to be coated is
It is moved up and down by a moving device.

Although the problems of the prior art could be achieved, it became clear that there was a problem in that the finished surface was not necessarily good.

Means for Solving the Problem According to the research conducted by the present inventor, it was found that the reason why the finished surface is not good is as follows.

That is, during painting, a portion of the paint sprayed from the spray gun does not adhere to the surface to be coated, but floats as dust near the surface to be coated. While floating, the solvent evaporates, thereby turning the paint into a dry mist. At the same time, the paint descends sequentially due to gravity.

According to the conventional method, the spray gun is moved from side to side by a reciprocating device both while the object to be coated is being raised and while it is being lowered to perform painting.

If the coating is performed while the object is being lowered relative to the spray gun, the painted surface will be located sequentially below the surface being painted. For this reason, the dust formed as described above adheres to the painted surface during the descent, impairing the finished surface.

On the other hand, if the coating is applied while the surface to be coated is raised relative to the spray gun, the coating will be applied below the painted surface. Therefore, only a small amount of dust adheres to the painted surface.

According to the present invention, in order to solve the above problems, the present invention includes: a spray gun that operates using air pressure; a moving device that moves the object to be coated or the spray gun in a vertical direction; and a moving device that moves the spray gun or the object to be coated in a substantially horizontal direction. An object to be coated is coated by a coating device comprising: a pneumatically operated reciprocating device that is reciprocally moved at a reciprocating device; and a control section that is combined with the moving device, the spray gun, and the reciprocating device and controls the operation of these devices. In the automatic painting method, during a lifting step in which the moving device raises the object to be coated relative to the spray gun, the spray gun is operated, and the moving device moves the object to be coated relative to the spray gun. There is provided an automatic coating method characterized in that the spray gun is not operated during a lowering step of lowering the object to be coated.

According to the method according to the invention, the spray gun is activated only during the lifting step. Therefore, the upper part of the painted part has already been painted, and the lower part has not yet been painted.

Therefore, there is less dust adhesion and a good finished surface can be obtained.

Embodiment Next, a preferred embodiment of the automatic painting method according to the present invention will be described with reference to FIGS. 1 to 5.

(Summary) The automatic painting apparatus for carrying out the method according to this embodiment has a spray gun section 15 as shown in FIG.
, a lifter section 16 , a counter section 17 , and a control section 18 .

The spray gun section 15 includes a spray gun 19 and allows the spray gun 19 to move from side to side.

The lifter section 16 includes a support 22 that supports the object 20 to be coated and allows the object 20 to be moved up and down.

The counter section 17 is the lifter section 16
section 18 that counts the activations of and controls the necessary signals.
send to

Control section 18 is connected to spray gun section 15
and sends signals to lifter section 16 to control their operation.

(Spray Gun Section) With particular reference to FIG. 2, the spray gun section 1 will be described in detail.

Spray gun section 15 includes spray gun 19 and reciprocating device! It is equipped with 24.

The spray gun 19 starts spraying the coating liquid in response to a spray gun activation signal B+ (FIG. 5) from the control section 18 (FIG. 1), and a spray gun inactivation signal B- (FIG. 5).
(Figure) finishes spraying the coating liquid.

The reciprocating device 24 includes a movable member 26 supporting the spray gun 19, and the movable member 26 is moved left and right as described below. This reciprocating equipment! 24 can also be configured with a rodless cylinder, for example.

The spray gun section 15 further includes a first control valve 28, a second control valve 30, a first speed controller 32, a second speed controller 34, a first limit switch 36, a second limit switch 38, a third limit switch 40, and a fourth limit switch. It is equipped with a limit switch 42.

The first control valve 28 is connected to the control air source AC via a check valve 44 and the first speed controller 32
It is connected to the reciprocating device 24 via. When the first control valve 28 receives and receives the reciprocating plus signal A+ from the control section 18, it is in the operating position as shown in FIG. , the pressurized air is sent to the reciprocating device 24 via the first speed controller 32, and the reciprocating device! 24
The movable member 26 is moved to the right in FIG.

Similarly, when the second control valve 30 receives a reciprocating negative signal A- from the control section 18, it moves from an inoperative position as shown in FIG. Pressurized air is sent to the reciprocating device 24 via the stop valve 45, the second control valve 30, and the second speed controller 34, and the movable member 26 of the reciprocating device 24 is moved to the left in FIG.

1st to 4th limit switches 36, 38, 40 and 4
2 are each connected to a control air pressure source AC, and when each engages with a protrusion 27 installed on the movable member 26 of the reciprocating device 24, it sends out limit signals LSI to LS4. These signals are transmitted to the movable member 26 as described below.
control the movement of

(Lifter Section) Next, the lifter section 16 will be explained with reference to FIG.

The lifter section 16 includes a support 22 that supports the object to be coated 20 and a lift device 46 that moves the support 22 up and down.

One side of the support 22 is provided with dogs 47, that is, protrusions arranged at equal intervals. A limit switch detects this dog 47 as described below, and the height of the support body 22 is detected.

The lift device 46 includes a piston 4 integral with the support body 22.
8 and a locking means 50, the piston 4
8 is moved up and down as shown below, and the locking means 5
0 temporarily fixes the position.

Lifter section 16 further includes a third control valve 52
, fourth control valve 54, fifth control valve 56, OR element 58, first check valve 53, second check valve 55, third speed controller 60, fourth speed controller 62, fifth limit switch 64, 6 limit switch 66,
and a seventh limit switch 68.

The third control valve 52 is connected to the control air pressure source AC and further connected to the control section 18 via an OR element 58 and receives a lifter up signal C0 or a lifter down signal C-. Once in the release position as shown in FIG. 3, pressurized air is supplied to the locking means 50 to release the locking action and allow the piston 48 of the lift device 46 to move up and down. Lifter up signal C0 or lifter down signal C-
3, the third control valve 52 moves from the release position shown in FIG. The pressurized air is discharged, the locking means 50 is locked, and the piston 48 is fixed.

Instead of this locking means 50, for example, a locking means having a structure that becomes locked when pressurized air is supplied and released when pressurized air is exhausted can also be used.

The fourth control valve 54 is connected to the control air pressure source AC via the first check valve 53, and further connected to the lift device 46 via the third speed controller 60.
When the lifter receives the lowering signal C-, it moves from the non-operating state shown in FIG. and the lift device 4 via the third speed controller 60
Pressurized air is supplied above the piston 48 of No. 6 to lower the piston 48. At this time, the fifth control valve 56
is inactive, and the air below the piston 48 is exhausted to the atmosphere via the fourth speed controller 62 and the fifth control valve 56. When the lifter lowering signal C- is no longer received, the supply of pressurized air to the lift device 46 is stopped.

The fifth control valve 56 is connected to the control air pressure source AC via the second check valve 55, and further connected to the lift device R46 via the fourth speed controller 62.
When the risk increase signal C0 is received, the system moves to the operating state shown in FIG. Via the controller 62, the piston 4 of the lift device 46
Pressurized air is supplied to the lower side of the piston 48 to raise the piston 48. At this time, the fourth control valve 54 is in an inoperative state, and the air above the piston 48 is discharged to the atmosphere via the third speed controller 60 and the fourth control valve 54. When the lifter rise signal C+ is no longer received,
The supply of pressurized air to the lift device 48 is stopped.

A fifth limit switch 64 is connected to the control air pressure source AC and engages the lower protrusion 72 of the support 22 to issue a limit signal LS5 when the support 22 reaches its lowest position.

The sixth limit switch 66 is connected to the control air pressure source AC and outputs a limit signal LS6 each time it engages one protrusion of the dog 47 of the support 22.

A seventh limit switch 68 is connected to the control air pressure source AC and engages the upper protrusion 74 of the support 22 to issue a limit signal LS7 when the support 22 reaches its uppermost position.

These limit signals LS5, LS6, and LS7 control the vertical movement of the support 22, and therefore the object 20, as described below.

Incidentally, according to this embodiment, the lift device w46 of the lifter section 16 receives the lifter rise signal C during the rise stroke.
+ enters the fifth control valve 56, pressurized air from the fifth control valve 56 is delivered to the piston 4 of the lift device 46.
8, thereby causing the piston 48 to rise. Instead, a predetermined amount of pressurized air is supplied to the lower and upper sides of the piston 48, and the lifter rising signal C0 is
The lift assembly W146 and these control valves can also be configured to supply pressurized air to the control valve 54 and exhaust it from the upper side of the piston 48, thereby causing the piston 48 to rise.

(Counter Section) The counter section 17 will be explained with reference to FIG.

Counter section 17 includes air counter 76 and N
It has an OT element 80.

The air counter is connected to the air counter setting section (not shown).
, an input section Z, an output section A, a reset section Y, and a power section P. Pressurized air is supplied to the power section P from the control air source AC, and the input section Z receives and receives pulse signals, compares the number of pulse signals with the value of the air counter setting section, and determines the set value. , the output part A outputs an output signal when the sum of the pulse signals input to the input part Z is equal to the sum of the pulse signals inputted to the input part Z.

The input section 2 of the reciprocating counter 76 receives N.

A signal S7 from the seventh block 7 of the sequencer (FIG. 5) and a limit signal LS6 from the sixth limit switch 66 are supplied through the T element 80, and the seventh block 7
When the signal LS6 from the sixth limit switch 66 is turned off, one pulse signal is supplied to the input section of the air counter 76. Then, when the total of the pulse signals matches the set value of the air counter 76, a cycle signal C1 is output.

As a result, when the sixth limit switch 66 engages a predetermined number of docks 47, the cycle signal C1 is output.

Further, the air counter 76 is reset when the spray gun actuation signal B+ is supplied to the reset section Y.

Control Section The operation of the control section 18 and the method according to the invention will now be described with reference to FIG. 5 and FIGS. 1-4.

The control section 18 shown in FIG. 5 includes a start switch 70 and first to ninth blocks 1-9. In addition, a one-way/reciprocating selection switch (not shown) is provided to operate the lifter device 46 after performing a one-way reciprocating operation, or to select whether to activate the lifter device 246 after performing a reciprocating operation. With the one-way/reciprocating selection switch, if one-way operation is selected, the one-way signal S is sent to the control section 18, and if reciprocating operation is selected, the two-way signal S is sent to the control section 18. sent to.

Before the start of operation, as shown in FIG. 2, the protrusion 27 of the movable member 26 of the reciprocating device 24 is engaged with the first limit switch 36, and therefore the first limit switch 36 is outputting the limit signal LSI. .

First, the case where one-way operation is selected in the one-way/reciprocating switch will be explained.

When the start switch 70 is pressed, a start signal is sent to the first block 1, and since the first block 1 has the first limit signal LSI (as described above, the first limit signal LSI is output before the start of operation). ), outputs a reciprocating plus signal A+, which causes the spray gun 19 to move to the right in FIG.

When the spray gun 19 moves to the right and the protrusion 27 provided on the movable member 26 of the reciprocating device 24 engages the second limit switch 38, the process moves to the second block 2, where the reciprocating plus signal A0 and the spray gun are activated. A signal B+ is issued, whereby the spray gun 19 continues to move to the right and starts its operation to paint the object 20 to be coated.

Further, the air counter 76 (FIG. 4) is reset by the spray gun activation signal B+.

The spray gun 19 moves further to the right, and the protrusion 27 moves to the third position.
When the limit switch 40 is engaged, the third block 3 is entered and outputs the reciprocating plus signal A0 and the spray gun deactivation signal B-, which causes the spray gun 19 to continue moving to the right, but its operation is stopped.

The spray gun 19 moves further to the right, and the protrusion 27 moves to the fourth position.
When limit switch 42 is engaged and LS4 is provided, one-way operation is selected as described above in the one-way/reciprocating selection switch (not shown), so there is no signal LS7 from seventh limit switch 68. Under this condition, that is, under the condition that the object to be coated 20 is not at the uppermost position, the process moves to the seventh block 7, where the reciprocating operation is stopped and the lifter raising signal C+ is issued. As a result, the object 20 to be coated rises.

As the object to be coated 20 rises, the sixth limit switch 66 engages with the dock 47, and the limit signal LS6 is activated.
is issued, and then when the limit signal LS6 is cut off, the count of the air counter 76 increases by one, and when this count becomes equal to the set value, that is, when a predetermined number of docks 47 are When limit switch 36 is engaged, cycle signal C1 is generated. When the cycle signal C1 is output, since the limit signal S4 is output, the process moves to the fourth block 4 and the reciprocating minus signal A-
is released, and the spray gun 19 starts moving to the left in FIG.

When the spray gun 19 moves to the left and the protrusion 27 engages the third limit switch 40, the process moves to the fifth block 5, where a reciprocating minus signal A- and a spray gun activation signal B+ are output. As a result, the spray gun 19 continues to move to the left and the spray gun 19 starts operating. Further, the air counter 76 (FIG. 4) is reset by the spray gun activation signal B+.

The spray gun 19 moves further to the left, and the protrusion 27 moves to the second position.
When the limit switch 38 is engaged, the process moves to the sixth block 6, where a reciprocating minus signal A- and a spray gun deactivation signal B- are output. With this, spray gun 1
9 continues to move to the left, and the spray gun 19 stops operating.

The spray gun 19 moves further to the left, and the protrusion 27 moves to the first position.
When the limit switch 36 is engaged, under the condition that there is no signal LS7 from the seventh limit switch 68, that is, under the condition that the workpiece 20 is not in the uppermost position, the process moves to the seventh block 7, and the reciprocating operation is started. When the lifter is stopped, a lifter up signal C0 is issued. by this,
Similarly to the above case, the object to be coated 20 rises.

When the object 20 to be coated rises, the sixth limit switch 66 engages one of the predetermined number of docks 47 and the cycle signal C1 is output. At this time, the limit signal LSI from the first limit switch 36 is activated. Since the reciprocating signal A+ is output, the process moves to the first block 1, where the reciprocating plus signal A+ is output, and the spray gun 19 starts moving to the right in FIG.

In this way, the operation of moving to the right, rising by a predetermined interval, moving to the left, rising by a predetermined interval, moving to the right, and rising by a predetermined interval is repeated. 19 is activated, and the object 20 to be coated is coated.

When the lifter device 46 is actuated by the glue lift signal C+ from the seventh block 7 and the workpiece 20 reaches the uppermost position, the seventh limit switch 68 engages with the upper protrusion 74 and outputs the limit signal LS7. In response to this limit signal LS7, the spray gun 19 moves to the right or left, as in the case described above, and reaches the third block 3 or the sixth block 6. At this time, the limit signal LS7 is being output, so when the limit signal LS4 or LS1 is output from the fourth limit switch 42 or the first limit switch 36, the process moves to the eighth block 8, where the lifter lowering signal C- is output and the lifter device 46, the object to be coated 20 is lowered.

The object to be coated 22 descends and reaches the lowest position, and the fifth
When the limit switch 64 engages with the lower protrusion 72, a limit signal S5 is issued, and the process moves to the ninth block 9 to enter the start preparation state.

Next, a case where reciprocating operation is selected in the one-way/reciprocating switch will be explained.

When the start switch 70 is pressed, the first block 1, the second block 2 and the third block 3 are activated in the same way as in the one-way operation.
Then, the spray gun 19 moves to the right and paints.

In the state of the third block 3, when the signal LS4 from the fourth limit switch 42 is issued, that is, when the spray gun 19 moves to the far right, the process moves to the fourth block 4 since the reciprocating signal is being issued.

Next, the process moves to the fifth block 5 and the sixth block 6 in order.

In the state of the sixth block 6, when the limit signal LSI is issued, that is, the spray gun 19 moves to the leftmost position, under the condition that the limit signal LS7 is not issued, that is, when the object 20 is moved to the uppermost position. Under the condition that the object 20 is not in the position, the process moves to the seventh block 7, a lifter raising signal C+ is issued, and the object 20 to be coated is raised.

The object to be coated 22 is raised, and the sixth limit switch 6 is activated.
6 engages a predetermined number of dogs 47 or the seventh limit switch 68, the process returns to the first block 1 and reciprocating operation is performed again.

In the state of the sixth block 6, the limit signal LSI is output, that is, the spray gun 19 moves to the leftmost position, and the limit signal LS7 is output, that is, the object to be coated 20
When the lifter is at the uppermost position, the process moves to the eighth block 8 and a lifter lowering signal C- is issued, so that the object 20 to be coated is lowered.

Next, when the object 22 to be coated descends and reaches the lowest position, a limit signal LS5 is output from the fifth limit switch 64, and the process moves to block 9, where the start preparation state is entered.

Lifter equipment 24 is used for both one-way and reciprocating operation.
6 is preferably selected such that the surface of the object 20 to be coated is coated with at least no gaps.

As described above, while the lift device 46 is performing the lowering operation, the spray gun 19 does not operate and painting is not performed.

(Modified Embodiment) The embodiment described above is merely an example, and its operating mode can be modified in various ways.

For example, in the embodiment described above, the lifter device 46 lifts the object to be coated intermittently, but it can also be configured to continuously lift the object to be coated.

Moreover, the arrangement position of the spray gun 19 and the arrangement position of the object to be coated can also be reversed.

That is, in the embodiment as described above, the spray gun 19 is moved left and right by the reciprocating device 24,
The object to be coated 20 was moved vertically by a lift device 46. Conversely, the object to be coated can be moved left and right by the reciprocating device 24, and the spray gun 19 can be moved up and down by the lift device 46. In this case, according to the present invention, the spray gun is operated while the spray gun 19 is lowered, that is, during the rising process in which the object 20 to be coated is raised intermittently or continuously with respect to the spray gun 19. Become.

Effects of the Invention In the automatic painting method of the present invention, for example, an object to be coated is installed on a support of a moving device, and a nozzle of a spray gun installed on a movable member of a reciprocating device is arranged so as to oppose the object to be coated. This allows the object to be coated to be coated automatically.

Since the automatic painting method of the present invention can be operated and controlled entirely by pneumatic pressure and hydraulic pressure, it is highly safe with respect to highly flammable paints.

The automatic painting method of the present invention can use various elements of pneumatic and hydraulic circuits, so it uses a device that is smaller and more portable than automatic painting devices manufactured using conventional explosion-proof electrical equipment. can do.

According to the automatic painting method of the present invention, since the spray gun is operated only during the raising process in which the object to be coated is raised relative to the spray gun, the painted surface may be smeared by floating dust. The gender is small, therefore,
A good finished surface can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a simplified block diagram of an apparatus for implementing a method according to a preferred embodiment of the invention. 2 is a schematic diagram of the spray gun section of the apparatus of FIG. 1; FIG. 3 is a circuit diagram of the lid section of the apparatus of FIG. 1; FIG. FIG. 4 is a circuit diagram of the counter section of the device of FIG. 1; 5 is a circuit diagram of the control section of the apparatus of FIG. 1; FIG. 15...Spray gun section 16...Lifter section 17...Counter section 18...Control section 19...Spray gun 20...Workpiece 24...Reciprocating device 26...・Movable member 46...Lift device Fig. 1 Fig. 2

Claims (1)

[Claims] 1. A spray gun that operates using air pressure; a moving device that moves the object to be coated or the spray gun in a vertical direction; In an automatic coating method for painting an object to be coated using a coating device comprising a reciprocating device operated by the moving device, the spray gun, and a control section that is combined with the moving device, the spray gun, and the reciprocating device and controls the operation of these devices, During a rising step in which the moving device raises the object to be coated relative to the spray gun, the spray gun is operated, and the moving device lowers the object to be coated relative to the spray gun. An automatic painting method characterized in that the spray gun is not operated during the lowering step. 2. The automatic coating method according to claim 1, wherein the moving device continuously raises the object to be coated during the lifting step. 3. The automatic coating method according to claim 1, wherein during the raising step, the moving device sequentially repeats a rising state in which the object to be coated is raised by a predetermined interval and a stopped state in which it is stopped for a predetermined time. 4. During one stop state of the moving device, the reciprocating device moves the object to be coated in only one direction, and the spray gun is activated during this movement. automatic painting method. 5. A patent in which, during one stop state of the moving device, the reciprocating device moves the object to be coated in one direction and in the opposite direction, and the spray gun is activated between these movements. An automatic painting method according to claim 3.