JPH06254457A - Coating applying apparatus - Google Patents

Abstract

PURPOSE:To dispense with masking work, uniformize the coating film, and simplify the structure by controlling a transferring means which can be moved freely and a work supported in a way it can rotate freely to be at the same speed and at the same time positioning the painting position of the transferring means and the position to be coated of the work, and then pressing the work to the transferring means. CONSTITUTION:While a work being held on a holding stand 15 and before a servo motor 4 for a transferring roller 3 is rotated, a servo motor 16 of the holding stand 15 is rotated by a controller 26 to compensate the delay to the servo motor 4. Then the phases of the transferring rubber of the transferring roller 3 and the position to be transferred of a work are made to conform with each other by controlling the rotation of the servo motor 4. Next, based on the signal of a pulse generator 4b of a servo motor 4, the rotation of the servo motor 16 is controlled to make the rotating speed of the work and the moving speed of the transferring roller 3 conform with each other and the work is pressed to the transferring roller 3 by a sending apparatus s2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating film coating apparatus, and more particularly to a coating film coating apparatus for forming a coating film having a uniform thickness on an outer peripheral surface of a work at a predetermined position.

[0002]

2. Description of the Related Art Conventionally, for example, a piston P shown in FIG. 14 slides up and down in a piston cylinder of an engine. Therefore, for the purpose of reducing the sliding friction between the piston P and the piston cylinder, JP-A-3-3493 is used.
Techniques such as those disclosed in Japanese Patent Laid-Open No. 60 and Japanese Patent Laid-Open No. 61-166962 have been proposed.

In the former technique, a skirt portion (area indicated by a chain double-dashed line in FIG. 15) PS of the piston P is provided with a streak, and lubricating oil is supplied to the skirt portion PS to cause sliding friction. I tried to reduce it.

In the latter technique, a plating layer is provided on the sliding contact surface formed on the metal base material, and a large number of recesses are formed on the plating layer. A porous sprayed layer having a lubricating oil retaining function is provided in this recess. This sprayed layer absorbs lubricating oil to reduce sliding friction.

However, since the lubricating oil is not sufficiently supplied to the scratches and the sprayed layer immediately after the engine is started or in the high engine speed range, the above-mentioned technique causes the sliding oil to be removed immediately after the engine is started or in the high engine speed range. It becomes difficult to reduce dynamic friction.

As a countermeasure against this, it has been proposed to form a self-lubricating coating film on the skirt portion PS of the piston P.

[0007]

The self-lubricating coating film formed on the skirt portion PS is formed by spray coating. Further, in order to keep the thickness of the coating film uniform, spray coating is performed while rotating the piston P.

However, the piston P has a piston pin hole 51 for connecting a piston rod (not shown). The tolerance of this piston pin hole 51 is very small, and the paint by spray painting is used for the piston pin hole 5
If it adheres to 1, the pin may not be inserted. Therefore, it is necessary to perform masking in order to prevent the paint from adhering to parts other than the skirt portion PS of the piston P. However, there is a problem in that masking work must be performed for each piston P in order to form a coating film, and this masking work is very troublesome.

Further, since the spray coating is overspray, there is a problem that the coating material attached to the masked unnecessary portion is wasted. Further, spray coating uses a relatively large amount of solvent in order to make the paint easily fly off. Therefore, there is a problem that a coating booth provided with a fire extinguishing facility equipped with a water storage tank for storing water is required and the entire facility becomes large.

The present invention has been made to solve the above problems, and its purpose is to eliminate the need for masking work, to form a uniform coating film on a predetermined portion of a work, and to apply a paint to the unnecessary portion. It is an object of the present invention to provide a coating film coating device which can prevent adhesion and can simplify the equipment of a coating booth.

[0011]

In order to solve the above problems, the present invention provides a coating film coating apparatus for coating a predetermined outer peripheral surface of a workpiece with a coating film to form a coating film having a uniform thickness, A transfer means rotatably or movably provided, a paint supply means for applying a paint for forming a coating film having a uniform thickness on the outer peripheral surface of the work with respect to the transfer means, and holding the work, Work rotation holding means for rotating, speed control means for matching the moving speed of the transfer means to which the paint is attached and the peripheral speed of the work held on the work holding means, and the position of the paint attached to the transfer means The position of the paint adhered to the transfer means by aligning the moving speed of the transfer means and the peripheral speed of the work with an alignment control means for performing alignment with a predetermined position of the work to form the coating film. And the above The gist of the present invention is to provide a coating film formation control means for pressing the work held by the work rotation holding means against the transfer means after the work is aligned with a predetermined position to form a film. .

[0012]

The coating material supplying means deposits the coating material on the predetermined outer peripheral surface of the work to the transfer means so as to form a coating film having a uniform thickness. Further, the work holding means rotates the work. The speed control means matches the moving speed of the transfer means to which the paint is attached and the peripheral speed of the work held by the work holding means. Then, the alignment control unit aligns the position of the paint attached to the transfer unit with the predetermined position of the work for forming the coating film. The position of the paint adhered to the transfer means is aligned with the predetermined position of the work to form a coating film by the speed control means and the alignment control means, and the moving speed of the paint adhered to the transfer means and the circumference of the work. When the speed and the speed match, the coating film formation control means causes the transfer means to press the work.

Therefore, the coating material adhered to the transfer means is transferred to a predetermined position on the work to form a uniform coating film.

[0014]

【Example】

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 6, the paint coating device 1
A transfer roller 3 that constitutes a cylindrical transfer unit and is made of a metal is provided substantially in the center of the upper surface of the base 2. The transfer roller 3 is connected to a first servomotor 4 arranged inside the base 2. Then, the transfer roller 3 is rotated (counterclockwise in this embodiment) by the rotation of the first servomotor 4.

As shown in FIGS. 1 and 8, on the outer peripheral surface 3a of the transfer roller 3, silicon rubber transfer rubbers 5 constituting transfer means are arranged at predetermined equal intervals (in this embodiment, six transfer rubbers 5). ) Is attached to. The size and shape of the transfer rubber 5 are formed according to the size and shape of the area of the coating film TM formed on the skirt portion PS of the piston P described in the related art.

As shown in FIGS. 1 and 6, a stainless steel mesh roller 6 is provided on the upper surface of the base 2, and the mesh roller 6 is a second servo provided inside the base 2. It is connected to the motor 7. Then, the mesh roller 6 is rotated (clockwise in this embodiment) by the rotation of the second servo motor 4. An elongated hole 2a is formed on the upper surface of the base 2 so as to extend toward the center of rotation of the transfer roller 3, and the mesh roller 6 is connected to a second servomotor 7 through the elongated hole 2a. .

The mesh roller 6 and the second servo motor 7 are transferred to the transfer roller 3 by a slider mechanism (not shown).
Is arranged so as to be slidable toward the center of rotation.
The feed shaft J1 of the feed device S1 is connected to the rotary shaft 6a of the mesh roller 6 via an absorber A1.
The feed shaft J1 slides the mesh roller 6 and the second servomotor 7 by driving the feed device S1. And the feeding device S1 is shown in FIG.
As shown by the two-dot chain line, the outer peripheral surface of the mesh roller 6 is pressed against the transfer rubber 5.

The outer peripheral surface of the mesh roller 6 is formed so that concave portions 6b, such as a quadrangular pyramid shape shown in FIG. 5, are arranged vertically and horizontally. Further, as shown in FIGS. 1 and 2, a squeegee 8 is disposed so as to be in sliding contact with the outer peripheral surface of the mesh roller 6. A paint device 9 for collecting and supplying the paint T is provided on the upper surface of the base 2. A connection pipe 10 for supplying the paint T is led out from the paint device 9. In addition, the tip of the connecting pipe 10 is provided with a supply pipe 11 that is close to and parallel to the outer peripheral surface of the mesh roller 6.
Is provided. A plurality of supply holes 12 are formed on the outer peripheral surface of the supply pipe 11 facing the outer peripheral surface of the mesh roller 6.

The connecting pipe 10 is connected to a paint supply pump 13 provided in the paint device 9. Therefore, the paint T is supplied to the outer peripheral surface of the mesh roller 6 through the connection pipe 10, the supply pipe 11, and the supply hole 12 by the operation of the paint supply pump 13. The rotation of the second servomotor 7 causes the paint T to adhere to the entire outer peripheral surface of the mesh roller 6 from the supply hole 12. The paint T attached to the outer peripheral surface of the mesh roller 6 is poured into the recess 6b of the mesh roller 6 by the squeegee 8, and the other paint T is scraped off by the squeegee 8. The paint T scraped off is collected by a collecting pipe 14 connected to the paint device 9.

The mesh roller 6, the squeegee 8, the paint device 9, the connection 10 and the supply pipe 11 constitute a paint supply means. On the upper surface of the base 2, a circular holding base 15 is provided as a work rotation holding means, and the holding base 15 is connected to a third servomotor 16 provided in the base 2. The rotation of the third servomotor 16 causes the holding table 15 to rotate clockwise. In addition, a long hole (not shown) facing the center of rotation of the transfer roller 3 is transparently provided on the upper surface of the base 2, and the holding table 15 is connected to the third servomotor 16 through the long hole.

As shown in FIGS. 3 and 4, the holding table 15
The lower surface of the first dog 17 is provided. A piston position sensor 18 that detects the inside of the first dog 17 is provided on the lower surface of the holding table 15. The piston position sensor 18 is arranged on a center line O connecting the center points of the holding table 15 and the transfer roller 3, respectively.

A piston P is arranged on the upper surface of the holding table 15 so as to be removable and rotatable integrally with the holding table 15. Further, as shown in FIG. 4, there are two skirt portions PS of the piston P, and in the present embodiment, the one skirt portion PS is held so that the circumferential center thereof coincides with the circumferential center of the first dog 17. It can be attached to the table 15.

The holding table 15 and the third servomotor 1
A slider mechanism 6 (not shown) is slidably arranged toward the center of rotation of the transfer roller 3. The rotary shaft 15a of the holding table 15 has a feeding device S similar to the above.
Two feed shafts J2 are connected via an absorber A2. Then, the feed shaft J is driven by driving the feed device S2.
2 slides the holding table 15 and the third servomotor 16. The feeding device S2 is shown in FIG.
As shown by the two-dot chain line, the piston P is pressed against the transfer rubber 5.

As shown in FIGS. 3 and 4, a second dog 21 is provided on the lower surface of the transfer roller 3. A transfer roller position sensor 22 for detecting the inside of the second dog 21 is provided on the lower surface of the transfer roller 3. The transfer roller position sensor 22 is arranged on the center line O.
The piston position sensor 18 and the transfer roller position sensor 22 are arranged so as to face each other.

Next, the electrical construction of the coating material application device 1 will be described. As shown in FIG. 6, the first servomotor 4 is connected via a servo amplifier 25 to a controller 26 as a speed control means, a positioning control means and a coating film formation control means. Then, the tacho generator 4a provided in the first servo motor 4 outputs a rotation speed signal of the first servo motor 4 to the controller 26. The controller 26 feedback-controls the first servomotor 4 via the servo amplifier 25 so that the rotation speed becomes a predetermined rotation speed based on the rotation speed signal. Further, the pulse generator 4b provided in the first servo motor 4 outputs a position pulse signal based on the rotation speed of the first servo motor 4 to the controller 26.

As shown in FIG. 6, the second servo motor 7 is connected to the controller 26 via a servo amplifier 34. The tacho generator 7a provided in the second servo motor 7 outputs a rotation speed signal of the second servo motor 7 to the controller 26. The controller 26 controls the second servomotor 7 via the servo amplifier 34 so that the rotation speed becomes a predetermined rotation speed based on the rotation speed signal. The second servo motor 7 is provided with a pulse generator 7b.
b outputs a position pulse signal based on the rotation speed of the second servomotor 7 to the controller 26.

As shown in FIGS. 6 and 7, the third servomotor 16 is connected to a controller 26 via a servo amplifier 27. Then, the third servo motor 1
The tachogenerator 28 provided in 6 outputs a rotation speed signal of the third servomotor 16 to the servo amplifier 27. The servo amplifier 27 adjusts the rotation speed to a predetermined rotation speed based on the rotation speed signal.
The servo motor 16 is controlled by foot back control.

A pulse generator 29 is provided in the third servo motor 16, and the pulse generator 2
Reference numeral 9 denotes a position pulse signal based on the rotation amount of the third servo motor 16 and a frequency divider 33 of the controller 26, which will be described later.
It is designed to output to.

As shown in FIG. 6, the piston position sensor 18 and the transfer roller position sensor 22 are the controller 2
6 is connected to the controller 26 based on the detection signals of the piston position sensor 18 and the transfer roller position sensor 22.
Is adapted to detect the first dog 17 and the second dog 21. Then, as shown in FIG. 4, the piston P
In the stopped state, the controller 26 stops the third servomotor 16 so that the first dog 17 faces the piston position sensor 18 based on the detection result of the piston position sensor 18.

Similarly, when the transfer roller 3 is stopped, the controller 26 controls the first servomotor 4 so that the second dog 21 faces the transfer roller position sensor 22 based on the detection result of the transfer roller position sensor 22. It is designed to stop. In this embodiment, this state is set as the home position.

As shown in FIG. 7, the controller 26
Correction circuit 30, deviation counter 31, D / A converter 3
2, a frequency divider 33 and a loop gain circuit 36 are provided.

A correction pulse signal from the correction circuit 30 is input to the deviation counter 31, and a position pulse signal from the pulse generator 4b in the first servomotor 4 is input. Has become. Further, the position pulse signal from the frequency divider 33 is input to the deviation counter 31.

Further, the deviation counter 31 is based on the position pulse signal from the pulse generator 4b in the first servomotor 4 and the pulse signal of the correction pulse signal from the correction circuit 30, and the D / A converter 32 and the loop gain circuit 36.
And the third servomotor 16 via the servo amplifier 27.
Drive control.

That is, the position pulse signal output from the pulse generator 4b by the rotation of the first servomotor 4 is output to the deviation counter 31. The deviation counter 31 counts the number of the position pulse signals, and outputs the position pulse signals sequentially to the D / A converter 32. The D / A conversion base 32 converts the differential output pulse signal into an analog signal and outputs it to the loop gain circuit 36 as a differential output signal.

The loop gain circuit 36 adjusts the level of the differential output signal by multiplying the gain coefficient by the differential output signal which is an analog signal from the D / A converter 32. The differential output signal whose level has been adjusted is output to the servo amplifier 27.

Then, the servo amplifier 27 subtracts the analog signal from the tacho generator 28 from the gain-adjusted analog signal from the D / A converter 32 and outputs the subtracted analog signal to the third servo motor 16. It is like this. As a result, the rotation of the third servo motor 16 is controlled.

For the purpose of forming a uniform coating film TM by bringing the skirt portion PS of the piston P and the transfer rubber 5 of the transfer roller 3 as close to the plane as possible, the diameter of the transfer roller 3 is equal to that of the piston P. It is larger than the diameter. Therefore, it is necessary to reduce the rotation speed of the piston P with respect to the rotation speed of the transfer roller 3. Therefore, the frequency divider 33
Divides the position pulse signal from the pulse generator 29, and matches the divided position pulse signal with the position pulse signal from the pulse generator 4b in the first servomotor 4.

The rotation of the first servo motor 4 causes the third servo motor 16 to rotate based on the position pulse signal output from the pulse generator 4b. Then, the position pulse signal is output from the pulse generator 29 to the frequency divider 33, and the frequency-divided frequency-divided pulse signal is output to the deviation counter 31. And
The deviation counter 31 counts the position pulse signal frequency-divided by the frequency divider 33, and subtracts this count number from the added and counted count number.

The deviation counter 31 stores the addition number of the position pulse signals output from the pulse generator 4b by the rotation of the first servomotor 4 and the subtraction number of the divided position pulse signals of the pulse generator 29. If they match, that is, if the count number of the deviation counter 31 is always constant, the controller 26 determines that the peripheral speeds of the transfer roller 3 and the piston P match.

The correction circuit 30 includes the first servomotor 4
The following delay of the third servomotor 16 with respect to the start of rotation is compensated. That is, the deviation counter 3
The third servo motor 16 is rotated by the position pulse signal output from 1 to the servo amplifier 27 via the D / A converter 32 and the loop gain circuit 36. The third servomotor 16 rotates, the pulse generator 29 outputs the position pulse signal to the frequency divider 33, and the frequency-divided position pulse signal is output to the deviation counter 31.

Therefore, for example, the frequency-divided position pulse signal corresponding to the first position pulse signal is not immediately output from the frequency divider 33, and a slight delay occurs.
Therefore, even if the first servo motor 4 starts rotating,
The third servomotor 16 cannot follow immediately. Therefore, the transfer rubber 5 of the transfer roller 3 and the piston P
The first servomotor 4 and the third servomotor 16 rotate in a state where they are not aligned with the skirt PS.

Therefore, the follow-up delay of the third servomotor 16 with respect to the first servomotor 4 is obtained in advance by experiments or the like, and the third delay with respect to the obtained first servomotor 4 is obtained.
A correction pulse signal based on the following delay of the servo motor 16 is set in the correction circuit 30. Then, before attempting to rotate the first servomotor 4, the correction circuit 30
Outputs a correction pulse signal to the deviation counter 31.

That is, the correction pulse signal is output from the correction circuit 30 to the deviation counter 31 before the first servomotor 4 starts rotating. The deviation counter 31 outputs the correction pulse signal to the D / A conversion base 32, and the D / A conversion base 3
2 converts this correction pulse signal into an analog signal and outputs it to the loop gain circuit 36. The loop gain circuit 36 multiplies the gain coefficient by the differential output signal which is an analog signal from the D / A conversion base 32 and is adjusted. The output signal is output to the servo amplifier 27.

At this time, since the third servo motor 16 is stopped, the output signal from the tacho generator 28 becomes 0, and the analog signal output from the loop gain circuit 36 via the D / A converter 32 is output. Signal to servo amplifier 2
It outputs to 7. Therefore, the third servomotor 16 is adapted to rotate by an analog signal based on the correction pulse signal. The correction pulse signal is counted by the deviation counter 31 so as to be sequentially added. However, the correction pulse signal is cleared to 0 before delay compensation is performed and the first servomotor 4 starts to rotate.

Therefore, before the transfer roller 3 rotates from the home position shown in FIG. 4, the piston P and the holding table 15 are rotated by the following delay, so that the piston P of the transfer roller 3 with respect to the transfer rubber 5 is rotated. Skirt PS
The phases can be matched, that is, can be aligned.

As in the above case, the frequency of the pulse signal of the second servo motor 7 is made the same as that of the position pulse signal of the first servo motor 4 by a frequency divider (not shown), and the controller 26 is operated based on these pulse signals. Is a mesh roller 6
And the transfer roller 3 have the same peripheral speed.

The feeding devices S1 and S2 are connected to a controller 26, and the driving of the feeding devices S1 and S2 is controlled by the controller 26. The controller 26 controls the peripheral speed of the first servomotor 4 and
When it is determined that the peripheral speed of the second servo motor 7 matches, the controller 26 drives and controls the feeding device S1 to slide the second servo motor 7 and the mesh roller 6 by the feeding shaft J1. Then, as shown in FIG.
The controller 26 stops the feeding device S1 while pressing the outer peripheral surface of the mesh roller 6 against the transfer rubber 5 of the transfer roller 3.

At this time, the paint T poured into the concave portions 6b of the mesh roller 6 is, as shown in FIGS.
It is attached to the transfer rubber 5. The paint T attached to the transfer rubber 5 has a hemispherical shape due to the surface tension. Further, in the present embodiment, the transfer rubber 5 containing the six paints T poured into the concave portions 6b of the mesh roller 6 is used.
The controller 26 drives and controls the feeding device S1 so that the outer peripheral surface of the mesh roller 6 is separated from the transfer rubber 5 when the transfer is completed.

Further, when the peripheral speed and phase of the first servo motor 4 and the peripheral speed and phase of the third servo motor 16 match, the controller 26 drives and controls the feeding device S2 to control the third servo. The motor 16 and the holding table 15 are slid. Then, as shown in FIGS. 8 and 11, the controller 26 stops the feeding device S2 while the skirt portion PS of the piston P is pressed against the transfer rubber 5. At this time, the coating material T attached to the transfer rubber 5 is attached to the skirt portion PS of the piston P, and the coating film TM having a uniform thickness of the coating material T is formed on the skirt portion PS.

After the coating film TM having a uniform thickness is formed on the skirt portion PS, the controller 26 drives and controls the feeding device S2 to separate the piston P from the transfer rubber 5. .

Next, the operation of the coating film coating apparatus 1 configured as described above will be described. First, the piston P is attached and fixed to the holding table 15 so as to be in the home position state shown in FIG. In this state, the correction circuit 30 of the controller 26 outputs the correction pulse signal to the deviation counter 31 before the first servomotor 4 rotates. The deviation counter 31 outputs the correction pulse signal from the correction circuit 30 to D
And outputs to the / A converter 32. The D / A converter 32 converts the correction pulse signal into an analog signal and outputs this analog signal to the loop gain circuit 36. Loop gain circuit 3
Reference numeral 6 multiplies the gain coefficient by the differential output signal which is an analog signal from the D / A converter 32, and outputs the product to the adjusted servo amplifier 27. Then, since the third servo motor 16 is still stopped, the output signal output from the tacho generator 28 to the servo amplifier 27 is zero. Therefore, the analog signal output from the loop gain circuit 36 via the D / A converter 32 is output to the servo amplifier 27.

Therefore, the third servomotor 16 starts to rotate before the first servomotor 4 and compensates for the delay with respect to the first servomotor 4. When the delay compensation is completed, the controller 26 clears the correction pulse signal to 0 because the deviation counter 31 counts the addition. After compensating for the tracking delay of the third servomotor 16, the controller 26 controls the rotation of the first servomotor 4 via the servo amplifier 25.

As a result, since the transfer rubber 5 of the transfer roller 3 and the skirt portion PS of the piston P can be in phase with each other, that is, alignment can be performed, the piston P is pressed against the transfer rubber 5 of the transfer roller 3. At this time, the transfer rubber 5 can be pressed against the skirt portion PS of the piston P.

On the other hand, when the controller 26 controls the rotation of the first servomotor 4, the position pulse signal from the pulse generator 4b provided in the first servomotor 4 is output to the deviation counter 31. The deviation counter 31 sequentially outputs the position pulse signal to the servo amplifier 27 via the D / A converter 32, and counts the position pulse signal so as to be added. Therefore, the third servomotor 16 starts rotating as the first servomotor 4 rotates.

At this time, there is a follow-up delay of the third servomotor 16 with respect to the rotation of the first servomotor 4, but since the delay compensation is performed by that amount, the transfer rubber 5 of the transfer roller 3 and the piston are delayed. The phase of P and the skirt portion PS match, that is, the alignment is surely performed.

When the third servo motor 16 rotates, the tacho generator 28 outputs it to the servo amplifier 27. Then, the servo amplifier 27 subtracts the analog signal from the tacho generator 28 from the analog signal from the loop gain circuit 36 via the D / A converter 32 and outputs the subtracted analog signal. The servo amplifier 27 rotationally controls the third servo amplifier 16 on the basis of the subtraction result to obtain the target speed.

On the other hand, the rotation of the third servomotor 16 causes the pulse generator 29 to output a position pulse signal to the frequency divider 33. The frequency divider 33 frequency-divides the position pulse signal from the pulse generator 4b to the frequency divider 33 and outputs it to the deviation counter 31. The deviation counter 31 subtracts the number of divided position pulse signals of the pulse generator 29 from the number of the position pulse signals output from the pulse generator 4b.

At this time, if the third servomotor 16 has just started to rotate, the divided position pulse signal output from the frequency divider 33 with respect to the number of position pulse signals output from the pulse generator 4b. Is smaller in number.
Therefore, the number of position pulse signals counted by the deviation counter 31 tends to increase.

When the rotation of the third servo motor 16 becomes stable, the number of position pulse signals output from the pulse generator 4b and the frequency-divided position pulse signals output from the frequency divider 33 are eventually detected. The number becomes equal and the number of position pulse signals counted by the deviation counter 31 becomes constant.

When the number of position pulse signals counted by the deviation counter 31 becomes constant, the controller 2
6 determines that the peripheral speeds of the first servo motor 4 and the third servo motor 16 match.

Further, similarly to the above, the controller 26 controls the rotation of the second servo motor 7 via the servo amplifier 34 so that the peripheral speed of the transfer roller 3 and the peripheral speed of the mesh roller 6 are matched. When the paint device 9 is driven, the paint supply pump 13 causes the paint T to adhere to the outer peripheral surface of the mesh roller 6 via the connection pipe 10, the supply pipe 11 and the supply hole 12. Further, the squeegee 8 allows the concave portion 6 of the mesh roller 6 to be
Paint T is poured into b and other paint T
It is scraped off and collected by the collecting pipe 14.

After confirming that the peripheral speed of the mesh roller 6 and the peripheral speed of the transfer roller 3 coincide with each other, the controller 26 drives and controls the feeding device S1 to move the feeding shaft S1 to the second position.
The servo motor 7 and the mesh roller 6 are slid. Then, as shown by the chain double-dashed line in FIG. 8, the outer peripheral surface of the mesh roller 6 is pressed against the transfer rubber 5 of the transfer roller 3. At this time, as shown in FIG. 9, the paint T poured into the recess 6b is attached to the transfer rubber 5. And
The controller 26 drives and controls the feeding device S1 when the paint T is attached to all of the transfer rubber 5 by the mesh roller 6, and separates the outer peripheral surface of the mesh roller 6 from the transfer rubber 5 by the feed shaft J1.

After confirming that the peripheral speed and phase of the piston P and the peripheral speed and phase of the transfer roller 3 match, the controller 26 drives and controls the feeding device S2 to move the piston by the feeding shaft J2. P is pressed against the transfer rubber 5 of the transfer roller 3. Then, the skirt portion P of the piston P
S is pressed against the transfer rubber 5. Therefore, the coating material T attached to the transfer rubber 5 is transferred to the skirt portion PS of the piston P, and the coating film TM having a uniform thickness is formed on the skirt portion PS. After that, the controller 26 drives and controls the feeding device S2 to separate the skirt portion PS of the piston P from the transfer rubber 5 of the transfer roller 3 by the feed shaft J2.

By this procedure, the coating film TM having a uniform thickness is reliably formed on the skirt portion PS of the piston P.
Further, when the controller 26 finishes the work for forming the coating film, the controller 26 determines the first dog 17 and the piston position sensor 1 based on the detection result of the piston position sensor 18.
The third servomotor 16 is stopped and controlled so that the third servomotor 16 and 8 are opposed to each other. Similarly, based on the detection result of the transfer roller position sensor 22, the controller 26 stops and controls the first servomotor 4 so that the second dog 21 and the transfer roller position sensor 22 face each other.

When continuing the work of forming the coating film TM on the skirt portion PS of the new piston P, the controller 26 controls the rotation of the second servomotor 7 and the coating device 9 meshes the coating material T. Roller 6
Supply to the outer peripheral surface of. Therefore, it is possible to prevent the paint T attached to the outer peripheral surface of the mesh roller 6 from being dried.

Therefore, the controller 26 controls the transfer roller 3
When the paint T is attached to the transfer rubber 5 by the mesh roller 6 in order to drive and control the second servomotor 7 so as to match the peripheral speed of the mesh roller 6 with the peripheral speed of the mesh roller 6,
The paint T can be surely attached to the piston P without the paint T being scratched.

Further, in the home position state, the correction circuit 30 of the controller 26 causes the piston P to rotate ahead of the tracking delay before the transfer roller 3 starts to rotate, so that the transfer rubber 5 of the transfer roller 3 moves to the piston P. The skirt portion PS can be surely brought into contact with the skirt portion PS. As a result, when the piston P is pressed against the transfer rubber 5, the paint T can be transferred to the skirt portion PS of the piston P to form the coating film TM.

Further, in order to make the contact between the transfer rubber 5 and the skirt portion PS of the piston P as flat as possible to form a coating film TM having a uniform thickness, the diameter of the transfer roller 3 becomes larger than the diameter of the piston P. . Therefore, the rotation speed of the piston P is higher than the rotation speed of the transfer roller 3. Therefore, the number of position pulse signals output from the pulse generator 29 of the third servomotor 16 is larger than the number of position pulse signals output from the pulse generator 4b of the first servomotor 4. The position pulse signal from the pulse generator 29 is frequency-divided by the frequency divider 33, and the number of pulse signals from the pulse generator 29 and the position pulse signal from the pulse generator 4b of the first servomotor 4 are divided. Match.

As a result, when the transfer rubber 5 is pressed against the skirt portion PS of the piston P, the peripheral speeds are the same, so that the transfer rubber 5 is prevented from slipping on the skirt portion PS and a uniform thickness is obtained. A coating film TM can be formed.

Further, since the coating material T can be formed by transferring the coating material T only to the required portion of the skirt portion PS of the piston P, unlike the conventional case, the coating material T can be applied to the unnecessary portion.
Can be prevented from adhering. As a result, the amount of paint used can be reduced and the yield can be improved. Further, it is not necessary to perform masking work on the piston P, and workability can be improved.

Further, unlike spray coating, it is not necessary to make the paint T easy to fly, and conversely, to prevent the paint T from dripping when it is transferred to the skirt PS of the piston P, it is necessary to give it some viscosity. . As a result, the viscosity of the coating material T is increased as compared with spray coating, so that the amount of solvent used can be reduced.

Further, since the amount of solvent used can be reduced and overspray unlike spray painting does not occur,
The painting space can be simplified and the fire extinguishing equipment for the painting booth can be simplified.

[Second Embodiment] Next, a second embodiment of the present invention will be described. Since the mechanical constitutions of the coating film coating apparatus 1 of the first embodiment are all the same and only the electric constitution of the control system is different, the same members and apparatuses are designated by the same reference numerals. Detailed description thereof will be omitted.

That is, the second embodiment is different from the first embodiment in that the differentiating circuit 35 is used in place of the correction circuit 30 of the first embodiment, as shown in FIG.
The position pulse signal output from the pulse generator 4b by the rotation of the first servomotor 4 is input to the differentiating circuit 35. And the differentiating circuit 3
The reference numeral 5 outputs an analog signal obtained by differentiating the position pulse signal output from the pulse generator 4b to the servo amplifier 27. That is, the pulse generator 4
Since the position pulse signal output from b serves as a position command for the servo motor 4, if this position pulse signal is differentiated, an analog signal serving as a speed command is output to the servo amplifier 27.

The position pulse signal output from the pulse generator 4b and the position pulse signal from the frequency-divided pulse generator 29 output from the frequency divider 33 are input to the deviation counter 31. . Then, the deviation counter 31 obtains the difference (phase difference) between the position pulse signal from the pulse generator 4b and the position pulse signal output from the frequency divider 33, and the difference output pulse signal obtained by this difference is D / It is adapted to output to the A converter 32. The D / A converter 32 converts the differential output pulse signal into an analog signal and outputs it as a differential output signal to the loop gain circuit 36.

The loop gain circuit 36 adjusts the level of the differential output signal by multiplying the gain coefficient by the differential output signal which is an analog signal from the D / A converter 32. The differential output signal whose level has been adjusted is output to the servo amplifier 27.

Then, the controller 26 uses the differentiating circuit 35.
And the gain-adjusted analog signal from the D / A converter 32 are output to the servo amplifier 27. Further, the servo amplifier 27 is adapted to subtract the analog signal from the tacho generator 28. The added / subtracted analog signal controls the third servomotor 16.

With this configuration, the third servomotor 16 can be operated without causing a delay in following the third servomotor 16 with respect to the first servomotor 1 or undershoot or overshoot. It is possible to perform control so that the peripheral speeds of the first servomotor 4 are the same and there is no phase shift.

Further, the deviation counter 31 obtains the difference between the position pulse signal output from the pulse generator 4b and the position pulse signal output from the frequency divider 33. When the difference becomes 0, the controller 26 determines The peripheral speeds of the first servo motor 4 and the third servo motor 16 match,
Moreover, it is determined that there is no phase shift.

Then, the controller 26 causes the peripheral speeds of the first servomotor 4 and the third servomotor 16 to match,
When it is determined that there is no phase shift, the controller 26 controls the feeding device S1 to bring the mesh roller 6 into contact with the transfer rubber 5 and deposit the paint T, as in the first embodiment. After that, the controller 26 controls the feeding device S2 to bring the piston P into contact with the transfer rubber 5 of the transfer roller 3.

When the transfer rubber 5 comes into contact with the skirt PS of the piston P, the paint T applied to the transfer rubber 5
Is transferred to the skirt portion PS of the piston P, and a coating film TM having a uniform thickness is formed on the skirt portion PS.

When the first servomotor 4 rotates and the transfer roller 3 rotates, the pulse generator 4b outputs a position pulse signal to the controller 26. Then, this position pulse signal is output to the differentiating circuit 35 and the deviation counter 31. The differentiating circuit 35 outputs to the servo amplifier 27 an analog signal which is a speed command obtained by differentiating the position pulse signal. At this time, the third servo motor 16
Is stopped, the analog signal output from the loop gain circuit 36 and the tacho generator 28 to the servo amplifier 27 becomes zero. Therefore, the analog signal output from the differentiating circuit 35 is output to the servo amplifier 27, and the third servo motor 16 rotates. Therefore, the third servomotor 16 immediately follows the rotation of the first servomotor 4 and rotates.

When the third servo motor 16 rotates, the output signal from the tacho generator 28 is output to the servo amplifier 27. Further, the position pulse signal from the pulse generator 29 is passed through the frequency divider 33 to the deviation counter 3
It is output to 1. The deviation counter 31 obtains a difference (phase difference) between the position pulse signal output from the pulse generator 4b and the position pulse signal output from the pulse generator 29, and outputs the difference pulse signal to the D / A converter 32.

The D / A converter 32 converts the differential pulse signal into an analog signal and outputs it to the loop gain circuit 36 as a differential output signal. The loop gain circuit 36 multiplies the gain coefficient by the differential output signal and outputs the multiplied differential output signal to the servo amplifier 27.

The servo amplifier 27 controls the third servomotor 16 based on the analog signal output from the controller 26. That is, the servo amplifier 27 connects the third servomotor 16 to the first servomotor 4. Control is performed so that the peripheral speeds are matched and the phase shift is eliminated. And
The servo amplifier 27 speed-controls the third servo motor 16 so that the speed does not overshoot or undershoot.

That is, even if the peripheral speed of the third servo motor 16 matches that of the first servo motor 4, the relative position (phase) between the first servo motor 4 and the third servo motor 16 matches. If not, a differential pulse signal commensurate with the lead or lag is obtained. Therefore, the deviation counter 31
Outputs this differential pulse signal to the D / A converter 32.
This differential pulse signal is output to the D / A converter 32, converted into an analog signal, and output to the loop gain circuit 36 as a differential output signal. Then, the loop gain circuit 3
6 multiplies the gain coefficient and this difference output signal and outputs the result to the servo amplifier 27, whereby the relative position (phase)
The deviation is corrected.

The controller 26 outputs an analog signal obtained by adding the analog signal from the differentiating circuit 35 and the differential output signal from the loop gain circuit 36 to the servo amplifier 27. Then, the servo amplifier 27 is further equipped with a tacho generator 2.
The output signal from 8 is subtracted and output. Therefore, the first servomotor 4 and the third servomotor 16 are aligned by the differential output signal output from the loop gain circuit 36.

Then, in the state where the alignment between the first servo motor 4 and the third servo motor 16 is completed, the difference pulse signal obtained by the deviation counter 31 becomes zero. Therefore, the differential pulse signal is not output to the D / A converter 32. Therefore, the controller 26
Determines that the peripheral speeds of the first servomotor 4 and the third servomotor 16 match and that there is no phase shift.

Then, the controller 26 causes the first
Similar to the embodiment, the feeding device S1 is controlled to bring the mesh roller 6 into contact with the transfer rubber 5 to deposit the paint T thereon. After that, the controller 26 controls the feeding device S2 to bring the piston P into contact with the transfer rubber 5 of the transfer roller 3.

When the transfer rubber 5 comes into contact with the skirt PS of the piston P, the paint T applied to the transfer rubber 5
Is transferred to the skirt portion PS of the piston P, and a coating film TM having a uniform thickness is formed on the skirt portion PS.

As a result, when the first servomotor 4 is rotated, the position pulse signal output from the pulse generator 4b is converted into an analog signal by the differentiating circuit 35 and output to the servo amplifier 27. The third servomotor 16 can immediately follow the rotation of the servomotor 4. Therefore, unlike the first embodiment, it is not necessary to compensate for the following delay of the third servomotor 16 with respect to the rotation of the first servomotor 4, and the phase between the transfer roller 3 and the piston P, that is, the position Matching can be done.

In the first embodiment, the piston P is rotated before the start of the rotation of the transfer roller 3 to compensate for the follow-up delay, and the skirt portion PS is aligned so as to come into contact with the transfer rubber 5. However, it is also possible to rotate the transfer roller 3 for alignment.

Further, as shown in FIG. 12, the controller 2
6 indicates the first dog 17 and the second dog 2 based on the detection results of the piston position sensor 18 and the transfer roller position sensor 22.
The phase correction amount ΔA is calculated based on the difference between the detection signals of 1. Based on this phase correction amount ΔA, rotation control of the first or third servomotors 4, 16 is performed to perform phase correction,
It is also possible to align the transfer rubber 5 and the skirt portion PS of the piston P.

In the first and second embodiments, the coating film coating device 1 for forming the coating film TM having a uniform thickness on the skirt portion PS at the predetermined position of the piston P is embodied. It is also possible to use it as a coating film coating device 1 for forming a coating film TM having a uniform thickness at a predetermined position on the outer peripheral surface of a work having a columnar or cylindrical shape.

Although the transfer roller 3 is used in each of the above embodiments, a flat transfer plate is used in place of the transfer roller 3 and the coating material may be adhered to a predetermined position of the transfer plate. Good. That is, the transfer plate and the piston P are aligned in advance. In this state, the piston P is pressed against the transfer plate, and the piston P is rotated and the transfer plate is moved horizontally while synchronizing the horizontal moving speed of the transfer plate and the rotational speed of the piston P. Let Then, the coating film TM can be formed on the skirt portion PS of the piston P.

[0097]

As described above in detail, according to the present invention, the moving speeds of the work and the paint are matched, and the position of the paint attached to the transfer means and the predetermined position of the work on which the coating film is to be formed are set. By combining them, a uniform coating film can be formed only on a predetermined position of the work. As a result, it is possible to prevent the paint from adhering to unnecessary parts of the work, so that it is possible to eliminate the need for masking work, improve the yield of paint, and simplify the equipment of the coating booth. There is an excellent effect that can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a coating film coating apparatus according to the present invention.

FIG. 2 is a conceptual diagram showing the configurations of a coating device and a mesh roller.

FIG. 3 is a partial side view showing that the first and second dogs are provided on the lower surfaces of the holding table and the transfer roller, and the piston position sensor and the transfer roller position sensor detect the first and second dogs.

FIG. 4 is a partial plan view showing a home position state of a holding table and a transfer roller.

5A and 5B are a front view and a side sectional view showing a shape of a recess provided on an outer peripheral surface of a mesh roller.

FIG. 6 is a block diagram showing an electrical configuration of the coating film coating apparatus according to the first embodiment.

FIG. 7 is an electrical block diagram showing an electrical configuration of a controller.

FIG. 8 is a partial plan view showing that the piston and the mesh roller are pressed by the transfer rubber of the transfer roller.

FIG. 9 is a front view showing a state in which paint is attached to the transfer rubber by a mesh roller.

FIG. 10 is a partial cross-sectional view showing a state before the skirt portion of the piston is pressed by the transfer rubber.

FIG. 11 is a partial cross-sectional view showing a state in which the skirt portion of the piston is pressed against the transfer rubber and a coating film is formed on the skirt portion by the paint.

FIG. 12 is a characteristic diagram showing another example in which the skirt portion of the piston and the pressing rubber of the transfer roller are aligned with each other.

FIG. 13 is a block diagram showing an electrical configuration of a coating film coating apparatus according to a second embodiment.

FIG. 14 is a perspective view of a piston.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coating film coating device, 3 ... Transfer roller which comprises transfer means, 5 ... Transfer rubber which comprises transfer means, 6 ... Mesh roller which comprises paint supply means, 8 ... Squeegee which constitutes paint supply means, 9 ... A paint device that constitutes paint supply means,
DESCRIPTION OF SYMBOLS 10 ... Connection pipe which comprises a paint supply means, 15 ... A holding stand as a work rotation holding means, 26 ... A controller as a speed control means, a positioning control means and a coating film formation control means, P ... A piston as a work, PS … Skirt, T… Paint, TM… Coating

Claims (1)

[Claims] 1. A coating means for applying a coating material to a predetermined outer peripheral surface of a work to form a coating film having a uniform thickness, the transfer means being rotatably or movably provided, and the transfer means. To the outer peripheral surface of the work, a paint supply means for applying a paint to form a coating film having a uniform thickness, a work rotation holding means for holding and rotating the work, and a transfer means to which the paint is attached. Speed control means for matching the moving speed of the work and the peripheral speed of the work held by the work holding means, the position of the paint adhered to the transfer means, and the predetermined position of the work for forming the coating film. Alignment control means for performing alignment, matching the moving speed of the transfer means and the peripheral speed of the work,
A coating film for pressing the work held by the work rotation holding means against the transfer means after aligning the position of the paint adhered to the transfer means with a predetermined position of the work for forming the coating film. A coating film coating apparatus comprising: a formation control unit.