JP2003281999A - Coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating apparatus which coats a conductive material for facilitating uniform close contacting of a sponge body to a funnel inner surface of a cathode-ray tube. <P>SOLUTION: A pair of pistons 36a, 36b of cylinders 34a, 34b presses pressing sections 27a, 27b of a holding base 23. The holding base 23 rocks tangentially to a roll 29, and slides in the longitudinal direction of a sliding groove 32 of a guide block 31. The sponge body 21 impregnated with the conductive material is pressed on and slidably follows the funnel inner surface. Non-uniformity of pressure on the funnel inner surface by the sponge 21 is decreased by controlling the pressing of the pistons 36a, 36b of the cylinders 34a, 34b. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for coating a coating material by pressing a coating member against a surface to be coated such as an inner surface of a funnel forming a cathode ray tube.

[0002]

2. Description of the Related Art Generally, a high voltage is applied to an anode terminal provided on a funnel forming a cathode ray tube,
It is necessary to apply a high voltage of -30 KV to the aluminum layer on the phosphor screen. Conventionally, anode terminal, funnel conductive film,
Since a high voltage is applied in the order of the aluminum layer on the phosphor screen forming the panel and the panel, a conductive material as a coating material is applied to this funnel to form an aluminum layer, and a high voltage is applied to this aluminum layer. Is being applied.

As a coating apparatus of this type, a structure described in, for example, Japanese Patent Laid-Open No. 7-153375 is known. The coating device described in Japanese Patent Application Laid-Open No. 7-153375 presses the coating member against the inner surface of the funnel by the elastic force of an elastic member such as a compression spring, and adheres the conductive material to the coating member to impregnate the conductive material. Apply to the inner surface of the funnel.

Further, in this coating apparatus, the central portion of the holding base as a holding portion for holding the coating member is rotatably supported by the central portion of the equalizing base as a guide portion. A pair of compression springs are interposed between both ends of the holding base and the equalize base. The equalizing base is slidably suspended by a driven base as a driven portion via a sliding mechanism as a moving unit having a pair of long guide shafts.

Further, one compression spring is inserted between the center of the equalizing base and the driven base. Then, a pair of compression springs interposed between both ends of the holding base and the equalizing base by pressing the coating member against the inner surface of the uneven funnel formed with different curvatures that form the cathode ray tube, The inner surface conductive film is uniformly applied to the inner surface of the funnel by the elastic force of the compression spring interposed between the central portion of the equalize base and the driven base.

[0006]

However, in the coating device described in Japanese Patent Laid-Open No. 7-153375 described above, the holding base is swung by the elastic force of the pair of compression springs with respect to the equalizing base. When the drive base is tilted with respect to the horizontal, the pressure balance between the pair of compression springs is lost, and the reproducibility of the application boundary on the inner surface of the funnel is deteriorated.

Further, in consideration of the application posture of the driven base, the elastic force of the pair of compression springs between the holding base and the equalizing base is strengthened so that the pair of compression springs are generated when the driven base is tilted. The collapse of the pressure balance can be eliminated, but by strengthening the elastic force of the pair of compression springs, the pressure of pressing the application member by the pair of compression springs against the inner surface of the funnel also increases.

For this reason, the coating member cannot be along the inner surface of the funnel, so that it is not easy to apply the conductive material by bringing the coating member into contact with the inner surface of the funnel with a uniform force. In addition to the disappearance, there is a problem that the coating material wears quickly due to the pressure load on the inner surface of the funnel by the coating member.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coating apparatus in which the coating member can more easily make uniform contact with the surface to be coated.

[0010]

According to the present invention, there is provided a coating member to which a coating material is attached, a rotating body, a holding portion for holding the coating member, and the holding portion in the circumferential direction and the diameter of the rotating body. It is provided with a moving means for moving along the direction, and a drive control means for pressing the holding portion and moving it by the moving means to press the coating member against the surface to be coated.

When the holding part is pressed by the drive control means, the holding part is moved by the moving means along the circumferential direction and the radial direction of the rotating body to press the coating member against the surface to be coated. By controlling the pressing of the holding portion by the means, it is possible to suppress the non-uniform distribution of pressure on the surface to be coated by the coating member, and thus it becomes easy for the coating member to uniformly contact the surface to be coated.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a coating apparatus of the present invention will be described below with reference to FIGS.

1 to 3, reference numeral 1 denotes a coating apparatus main body, and the coating apparatus main body 1 has an uneven funnel 2 which constitutes a cathode ray tube as shown in FIG. 3, and the funnel 2 is different. A conductive material 4 as a coating material is applied to the inner side surface 3 as a surface to be coated which is formed with a curvature, and the funnel conductive film 5 is applied to the inner side surface 3 of the funnel 2.
To form.

The funnel 2 is formed in a cylindrical shape with a different curvature toward the seal surface 7 side facing the flare portion 6 on which an electron gun (not shown) is mounted.
Further, an anode button 9 as an anode terminal is provided on the peripheral surface on the short side 8 of the funnel 2. The outer peripheral edge of the seal surface 7 of the funnel 2 becomes the non-application surface 11 on which the conductive material 4 is not applied.

The outer peripheral surface of the funnel 2 on the flare portion 6 side of the non-coated surface 11 and on the seal surface 7 side of the reference line 12 of the funnel 2 has a relatively small unevenness and a small curvature. It becomes the coated surface 13. The first coated surface 13 is formed from the short side 8 of the funnel 2.
It is provided along the circumferential direction over the long side 14 facing the short side 8 and the application of the conductive material 4 is relatively easy. Further, the outer peripheral surface of the funnel 2 closer to the flare portion 6 than the first coated surface 13 is a second coated surface 15 having relatively large irregularities and a large curvature. This second coated surface 15
Is provided along the circumferential direction across the reference line 12 from the short side 8 to the long side 14, and it is relatively difficult to apply the conductive material 4.

On the other hand, in the coating apparatus main body 1, the conductive material 4 is coated to form the funnel conductive film 5 on the inner surface 3 of the funnel 2.
The sponge body 21 is provided as a coating member for forming a film. As shown in FIGS. 1 and 2, the sponge body 21 is formed in an elongated cylindrical shape and is impregnated with a predetermined amount of the conductive material 4 attached thereto. Further, on the outer peripheral surface of the sponge body 21, one end edge of a substantially rectangular flat plate-like connecting piece 22 for supporting and connecting the sponge body 21 is attached.
The connecting piece 22 is arranged with its surface direction oriented in the radial direction of the sponge body 21, and is connected to an intermediate portion of the sponge body 21 in the axial direction.

The other end edge of the connecting piece 22 is provided at the tip of a holding base 23 as a holding portion for holding the sponge body 21 swingably and slidably via the connecting piece 22. It is fitted and sandwiched in the mounting recess 24, and is detachably tightened and fixed by a bolt and nut (not shown). Both side edges on the base end side of the holding base 23 project over both side areas in the axial direction of the sponge body 21. Further, a pair of pressing piece portions 26a, 26b protruding along the axial direction of the sponge body 21 and the surface direction of the connecting piece 22 are integrally provided on both side edges on the base end side of the holding base 23. . Flat pressing surfaces 27a, 27b projecting in a cylindrical shape are provided on the upper end sides, which are the base end sides of the pair of pressing pieces 26a, 26b, respectively.

Further, in the central portion along the surface direction of the connecting piece 22 on the base end side of the holding base 23, there is an elongated columnar shape having an axial direction along the front-back direction orthogonal to the surface direction of the connecting piece 22. The shaft 28 is attached. This shaft
28 is provided at a position where the central axis is orthogonal to the contact surface of the sponge body 21 with the inner side surface 3 of the funnel 2. That is, the shaft 28 is attached to the center of the sponge body 21 in the axial direction.

Further, a roller body 29, which is an annular rotating body for expanding the diameter of the shaft 28, is inserted and hung between the tip end and the base end which are both ends of the shaft 28 so as to be sandwiched therebetween. It is installed. These roller bodies 29 are provided with sliding groove portions 32 provided in a pair of rectangular flat plate-shaped guide blocks 31 which are guide portions as moving means.
Is slidably and rotatably engaged with. The sliding groove portions 32 of the pair of guide blocks 31 allow the holding base 23 to rotate, that is, swing, along the circumferential direction with the central axis of the roller body 29 as a reference. In addition, these sliding groove portions 32 form the holding base 23 along the radial direction of the roller body 29 by, for example, 15 m.
Sliding is possible within a sliding range of m or less.

Further, these sliding groove portions 32 are sponge bodies.
The sponge body 21 is formed in a long hole shape having a longitudinal direction along the radial direction of the sponge body 21, which is a direction perpendicular to the axial direction of the sponge body 21. Further, the sliding groove portions 32 have a width dimension substantially equal to the outer diameter dimension of the roller body 29 and a longitudinal dimension larger than the outer diameter dimension of the roller body 29. For this reason,
These sliding groove portions 32 swing the holding base 23 about the central axis of the roller body 29 as a rotation center, and
The holding base 23 is moved along the longitudinal direction of the sliding groove portion 32 along the radial direction of 29.

The pair of guide blocks 31 are arranged in parallel with each other so that the plane direction is along the plane direction of the connecting piece 22. The upper end surface, which is the base end surface of each of the pair of guide blocks 31, is a lower end surface that is one main surface of a rectangular flat plate-shaped driven base 33 as a driven portion that supports the holding base 23 in a suspended manner. They are connected in an upright state. Further, the upper end surfaces of the pair of guide blocks 31 are respectively formed by the sponge body of the driven base 33.
Each of them is connected to an intermediate portion in the width direction along the axial direction of 21.

On the lower end surface of the driven base 33, which is the both side regions of the pair of guide blocks 31, there is a pressing means as a drive control means for pressing with a constant pressure, that is, a pair of cylinders 34a, 34b. Each is installed. The pair of cylinders 34a and 34b make the contact pressure of the sponge body 21 on the inner surface 3 of the funnel 2 constant. Further, the pair of cylinders 34a, 34b,
The holding base 23 is arranged at a position opposite to the center axis of the roller body 29. Further, the mounting height of the pair of cylinders 34a, 34b allows the swing angle of the sponge body 21 with respect to the driven base 33 to be set, and also the holding base.
By pressing 23, the sponge body 21 can be maintained at a constant pressure at any swing angle.

Further, each of the pair of cylinders 34a, 34b is orthogonal to the axial direction of the sponge body 21 and has a cylinder main body 35 having an axial direction along the surface direction of the connecting piece 22.
It has a and 35b. These cylinder bodies 35a, 35b, while penetrating both sides in the width direction of the driven base 33,
It is attached to both sides of the roller body 29. Further, at the lower end which is the tip of these cylinder bodies 35a, 35b, elongated substantially cylindrical pistons 36a, 36b having an axial direction that coincides with the axial directions of these cylinder bodies 35a, 35b are attached such that they can move forward and backward. There is. These pistons 36a and 36b move back and forth substantially in proportion to the pressure supplied into the respective cylinder bodies 35a and 35b.

Each of the pistons 36a and 36b has a holding base 2
They are concentrically attached to the pressing surface portions 27a and 27b of 3, and press the both sides of the holding base 23. Also,
Each of these pistons 36a, 36b has a pressing surface portion 27a,
The sponge body 21 is pushed into the funnel 2 by contacting and pressing 27b.
Press on the inner surface 3 of. That is, these pistons 36
The a and 36b are configured such that only one of the pistons 36a and 36b is advanced toward the cylinder main bodies 35a and 35b, and the one pressing surface portion 27 of the holding base 23 facing the pistons 36a and 36b.
By pressing a and 27b, the holding base 23 is rotated, that is, rocked about the central axis of the roller body 29. Also, these pistons 36a and 36b are
By retracting 6a and 36b from the pressing pieces 26a and 26b of the holding base 23, the holding base 23 is slid into the sliding groove portion.
It is slidable along the longitudinal direction of 32.

Here, the swing of the holding base 23 as the pistons 36a, 36b move forward and backward is attached to the front side in the front-rear direction which is the width direction of each pressing piece portion 26a, 26b of the holding base 23. The swing angle, which is the rotation angle, is regulated by stoppers 37a and 37b having L-shaped cross sections as swing angle regulation means. The stoppers 37a, 37b adjust the mounting positions of the stoppers 37a, 37b to set the swing range, which is the operating range of the holding base 23, to ± 15 ° or less, for example. Further, on the upper side surface on the rear side in the longitudinal direction, which is the longitudinal direction of the driven base 33, the arm of the robot as a position changing means for changing and moving the position of the coating apparatus main body 1 via the driven base 33. It is connected to the part 38.

Further, hose bodies 41a and 41b, through which oil for hydraulic control flows, are connected to the base ends of the pair of cylinders 34a and 34b in the axial direction. Each of these hose bodies 41a, 41b is
It is connected to a solenoid valve 42 that shuts off the flow of oil in 1b.

Here, in the pair of cylinders 34a, 34b, the piston 36a of one cylinder 34a is pushed by the one pressing surface portion 27a of the holding base 23, and the pressure in the cylinder body 35a of this one cylinder 34a is changed. When it becomes higher, pressure is applied to the cylinder body 35b of the other cylinder 34b so as to equalize this pressure, and the piston 36b of the other cylinder 34b is
Protrudes and presses the other pressing surface portion 27b of the holding base 23, so that the pair of cylinders 34a, 34b evenly contact both sides of the sponge body 21 in the axial direction with the inner side surface 3 of the funnel 2. 21 uniformly extends along the inner surface 3 of the funnel 2.

Further, the solenoid valve 42 is connected to pressure control devices 43a and 43b as pressure control means for controlling the pressure applied to the pistons 36a and 36b of the cylinders 34a and 34b, for example, by increasing and decreasing the pressure such as hydraulic pressure and locking the pressure. Has been done. Therefore,
Each of these pressure control devices 43a and 43b controls the contact pressure of the sponge body 21 with the inner surface 3 of the funnel 2.

Each of these pressure control devices 43a, 43b is connected to a control panel 44 as a control means for controlling the pressure control by these pressure control devices 43a, 43b and the opening / closing of the solenoid valve 42. This control panel 44 includes pressure control devices 43a,
From the control of 43b, the driven base 3 by the robot arm 38
The arithmetic unit 45 is provided as an arithmetic unit that stores the position, the movement angle, the locus of movement, and the like of the coating apparatus main body 1 via 3 and operates based on this memory. Then, the control panel 44 is configured so that the sponge body 21 of the coating apparatus main body 1 is based on the position, the movement angle, and the locus of movement of the coating apparatus main body 1.
The contact pressure of the sponge body 21 on the inner side surface 3 of the funnel 2 is controlled by controlling the position and angle of the, and the strength of the pressing pressure.

Further, a point command is input to the control panel 44 according to a predetermined coating locus, and the supply pressure arbitrarily set by the pressure control devices 43a and 43b is applied to the solenoid valve 4.
The cylinders 34a, 34b are appropriately advanced and retracted based on a control program which is switched by 2 to control the cylinders 34a, 34b so as to optimally follow the inner surface 3 of the funnel 2 and slide.

Next, a coating method by the coating apparatus according to the above embodiment will be described.

First, the funnel 2 installed at a predetermined position.
The arm 38 of the robot moves toward the first coated surface 13, which is the inner surface 3 of the robot, based on a predetermined coating trajectory.

At the same time, by the point command based on the application locus of the arm 38 of the robot calculated by the calculation device 45, the control panel 44 is arbitrarily operated by each pressure control device 43a, 43b based on the control program inputted in advance. Solenoid valve 4
The pair of cylinders 34a, 34b is controlled by switching the switch with 2.

At this time, the other cylinder 34b is advanced from the one cylinder 34a, and the one pressing surface portion 27b of the holding base 23 is pressed by the other cylinder 34b, so that the holding base 23 becomes one cylinder. Swing toward the 34a side.

Further, by holding or retracting each of the cylinders 34a and 34b at the same time, the holding base 23
Slide along the longitudinal direction of the sliding groove portion 32 of the guide block 31.

Then, the first coated surface 13 of the funnel 2
The sponge body 21 of the coating apparatus main body 1 is made to follow and slide in an optimum state over the entire area of the above, and the funnel conductive film 5 is formed on the first coated surface 13.

Similarly, the second coated surface 15 of the funnel 2
The sponge body 21 of the coating apparatus main body 1 is made to follow and slide in the optimum state over the entire area, and the funnel conductive film 5 is formed on the second coated surface 15.

As described above, according to the above-described embodiment, the pair of cylinders 34a, 34a provided on both sides of the driven base 33,
By changing the advancing / retreating distance of the pistons 36a, 36b of the 34b, the pair of pressing surface portions 27a, 27b provided on both sides of the holding base 23 by the pistons 36a, 36b of the pair of cylinders 34a, 34b are pressed. As a result, the holding base 23 swings along the circumferential direction with the central axis of the roller body 29 as a reference, and slides along the longitudinal direction of the sliding groove portion 32 of the guide block 31 while holding the holding base 23. The sponge body 21 at the tip of is pressed against the inner surface 3 of the funnel 2, and the conductive material 4 can be applied to the inner surface 3 of the funnel 2.

Therefore, based on the control program of the control panel 44 to which the point command is input according to the predetermined coating locus, the supply pressure arbitrarily set by each pressure control device 43a, 43b is switched by the solenoid valve 42 and a pair of By appropriately moving the pistons 36a, 36b of the cylinders 34a, 34b forward and backward to control the pressing of the pair of cylinders 34a, 34b against the pressing surfaces 27a, 27b of the holding base 23 by the pistons 36a, 36b. The sponge body 21 can be slid on the side surface 3 in an optimal state.

Therefore, since the non-uniform distribution of the pressure on the inner surface 3 of the funnel 2 by the sponge body 21 can be suppressed, the uniform contact of the sponge body 21 on the inner surface 3 of the funnel 2 can be facilitated. Therefore, the conductive material 4 can be applied while the sponge body 21 is evenly adhered to the inner surface 3 of the funnel 2.

The pressing surface portions 27a on both sides of the holding base 23,
27b is pressed by pistons 36a and 36b of a pair of cylinders 34a and 34b, and the holding base 23 is rotated and slid with respect to the central axis of the roller body 29. The sponge body 21 can be slid by following the inner surface 3 of the funnel 2 while suppressing the uneven distribution of pressure to the funnel 3. Therefore, the control for swinging and sliding the sponge body 21 is simplified and facilitated, so that the pressure adjustment on the inner side surface 3 of the funnel 2 by the sponge body 21 can be reliably and easily performed with simpler control. .

Further, since the pair of cylinders 34a and 34b are controlled by the plurality of pressure control devices 43a and 43b and the solenoid valve 42, the first coated surface 13 and the inner surface 3 of the funnel 2 which are different curvature surfaces and It is possible to control the swing of the sponge body 21 that is slid by following the second coated surface 15.
Therefore, the driven base 33 due to the movement of the robot arm 38
By reproducing the contact angle of the sponge body 21 regardless of the application posture of the first sponge body 21 on the inner surface 3 of the funnel 2.
Since it is possible to surely perform coating formation such as coating of the coating surface boundary between the coating surface 13 and the non-coating surface 11, stable coating quality can be obtained even under restricted conditions.

Further, in applying the conductive material 4 to the first coated surface 13 and the second coated surface 15 which are not subject to the conditions for coating formation, the pair of pressure control devices 43a and 43b are switched. The first coated surface formed with different curvatures by
The funnel 2 formed by the sponge body 21 can be slid optimally along the surface 13 and the second coated surface 15 as well.
It is possible to apply the conductive material 4 with reduced wear due to contact with the inner surface 3 of the.

Further, according to the calculation by the calculation device 45 of the control panel 44, depending on the shape of the sponge body 21, the mounting error, or the deterioration state of the contact surface of the sponge body 21, the sponge body 21 can be operated outside the coating operation range. Since the coating set pressure can be changed as appropriate, accurate and stable coating can be performed by the sponge body 21.

Further, since the cylinder bodies 35a, 35b of the pair of cylinders 34a, 34b are connected to each other by the hose bodies 41a, 41b, when the sponge body 21 is brought into contact with the inner side surface 3 of the funnel 2, When the contact pressures at both ends in the axial direction of the body 21 are not equal, one pressing surface portion 27a of the holding base 23 located on the side where the contact pressure is large presses the piston 36a of the one cylinder 34a. Then, in order to equalize this pressure, the piston 36b of the other cylinder 34b is
Pushes the other pressing surface portion 27b of the holding base 23.

Therefore, the funnel 2 is formed on both sides of the sponge body 21 in the axial direction by the pair of cylinders 34a, 34b.
The sponge body 21 can be reliably and evenly contacted with the inner surface 3 of the funnel 2 with a simpler structure.
The inner surface 3 of the can be evenly aligned.

In the above-mentioned one embodiment, the holding base
Although the sponge body 21 is fixed to the sponge body 23, even if a drive unit that drives the sponge body 21 with respect to the holding base 23 is provided in the coating apparatus main body 1, the same effect as that of the above-described embodiment can be obtained. it can.

Further, even if the surface to be coated having a different curvature other than the inner surface 3 of the funnel 2, for example, the outer surface of the funnel 2 is used, the sponge body 21 is optimally used by correspondingly using the coating apparatus main body 1. It can be made to follow and slide in a state.

[0049]

According to the present invention, by controlling the pressing of the holding portion by the drive control means, it is possible to suppress the non-uniform distribution of the pressure on the surface to be coated by the coating member, and to the surface to be coated by the coating member. It is easy to make uniform contact.

[Brief description of drawings]

FIG. 1 is a configuration front view showing an embodiment of a coating apparatus of the present invention.

FIG. 2 is a configuration perspective view showing an appearance of a gravure roll of the coating apparatus.

FIG. 3 is a configuration side view showing a funnel having a surface to be coated which is coated by the coating apparatus.

[Explanation of symbols]

2 funnel 3 Inner surface of funnel 2 as coated surface 4 Conductive material as coating material 21 Sponge body as coating material 23 Holding base as holding part 29 Roller body as a rotating body 31 Guide block which is a guide part as a moving means 32 Sliding groove 33 Driven base as driven part 34a, 34b Cylinder as drive control means 43a, 43b Pressure control device as pressure control means

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Claims (8)

[Claims] 1. A coating member to which a coating material is attached, a holding member for holding the coating member, and a moving unit for moving the holding member along the circumferential direction and the radial direction of the rotating member. And a drive control unit that presses the holding unit and moves it by the moving unit to press the coating member against the surface to be coated. 2. A rotating body attached to a holding portion, wherein the moving means swings the holding portion along a circumferential direction with a central axis of the rotating body as a reference, and a radial direction of the rotating body. The coating device according to claim 1, wherein the holding portion is slid along the surface. 3. The coating according to claim 2, wherein the moving means is a guide portion having a long groove-like sliding groove portion for holding the rotating body so as to be rotatable and movable in the radial direction. apparatus. 4. The coating apparatus according to claim 3, further comprising a driven part, to which the drive control means and the guide part are attached, and which supports the holding part in a suspended manner. 5. The holding section is provided over both side areas of the coating member, and the drive control means presses both side areas of the holding section to press the coating member against the object to be coated. The coating apparatus according to any one of 1 to 4. 6. The coating apparatus according to claim 1, wherein the drive control means is provided on both sides of the rotating body. 7. The coating apparatus according to claim 1, wherein the drive control means includes pressure control means for controlling the contact pressure of the coating member with the surface to be coated. 8. The surface to be coated is an inner surface formed with different curvatures of a funnel forming a cathode ray tube, and the coating material is a conductive material. Coating equipment.