JP2004105922A - Material coating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a material coating device which can rapidly rotate a nozzle without rotating a syringe in the circumferential direction while avoiding mutual interference of members. <P>SOLUTION: The material coating device is provided with a coating means 14 for coating the surface to be coated S of a work W with a material, and a transfer means 16 which transfers the coating means along a predetermined transfer track. The coating means is provided with the syringe 12 and the nozzle 13 connected to the bottom-end of the syringe. A discharge opening 24 of the nozzle 13 is formed in a noncircular shape. A motor M is arranged adjacent to the nozzle 13. The nozzle 13 can be rotated with a belt 34 connected with the motor M. The nozzle 13 moves with the position being adjusted so that the forward end along the transfer track of the discharge opening 24 is larger in width than the rear end. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a material application device, and more particularly, to a material application device capable of rotating a nozzle at a high speed in a circumferential direction when a coating direction is changed using a nozzle having a non-circular discharge port.
[0002]
[Prior art]
Examples of a material application device that applies a resin material onto an application surface of a work include, for example, an application device in which an outer peripheral portion of a main body case of a hard disk is used as an application surface and a sealant is applied on a locus substantially along the outer periphery of the main body case. It has been known. The material application apparatus includes a syringe provided with a nozzle capable of discharging a sealant, and moving means such as a robot for moving the syringe along a predetermined trajectory that has been taught in advance. The nozzle has a discharge opening having a circular opening shape at its tip, and moves along the trajectory while discharging the sealant from the discharge outlet. A bead having a kamaboko cross section is formed. A cover is overlaid on the main body case having such a bead formed thereon, and the cover and the main body case are integrated by screwing from the outside of the cover in a scattered manner. At this time, the bead is pressed from above by the cover, and the bead is interposed between the case main body and the cover with compressive deformation.
[0003]
However, in such a material application apparatus, since a bead having a substantially semi-cylindrical cross-sectional shape is formed, the amount of deformation at the upper end side of the bead is small, and between the beads when the cover is attached to the case body. However, there is a disadvantage that the sealing property is easily deteriorated. In particular, in the portion of the cover that is farther from the screw portion, the pressing force on the bead becomes relatively weaker than in the vicinity of the screw portion of the cover. On the other hand, if the screwing force on the cover is increased to increase the pressing force on the bead at the portion of the cover away from the screwed portion, excessive pressing force is applied to the bead near the screwed portion, and This causes another inconvenience that the bead is easily cut.
[0004]
Therefore, the present applicant has provided a non-circular discharge port at the nozzle tip so as to form a bead having a cross section of an acute triangle, for example, as a cross section of a bead that can be effectively deformed even with a weak pressing force. (Japanese Patent Application No. 2002-15633).
[0005]
[Problems to be solved by the invention]
By the way, in the case of material application using a nozzle having a non-circular discharge port, for example, when the movement trajectory changes in a curved line, the front and rear ends of the discharge port in the movement direction along the movement trajectory It becomes necessary to rotate the nozzle in the circumferential direction such that the relative position with respect to the side is kept constant and the cross-sectional shape of the bead is continuously connected. In this regard, the proposed device employs a configuration in which the nozzle is integrally rotated by rotating the syringe with a motor. However, according to such integral rotation with the syringe, accessory parts connected to the syringe, such as a tube for material replenishment, also rotate at the same time, causing interference with other members and increasing workability. There is the inconvenience of getting worse. In addition, when the movement trajectory changes two-dimensionally in a very short length region, the syringe cannot follow the change unless the rotation speed of the syringe is increased, and the load on the motor becomes extremely large. is there. Such inconvenience becomes remarkable when the capacity of the syringe is large, which causes an inconvenience that the size of the syringe is restricted and the degree of freedom in design is narrowed. Furthermore, in the configuration in which the syringe is rotated, the distance between the drive source and the nozzle outlet is inevitably separated, so that the outlet may be displaced from the rotation center axis when rotating the nozzle in the circumferential direction. This also causes the inability to accurately apply the material along a predetermined movement locus.
[0006]
[Object of the invention]
The present invention has been devised in view of such inconvenience, and its purpose is to prevent interference between members by rotating the nozzle as a minimum part without rotating the syringe in the circumferential direction. It is an object of the present invention to provide a material application device capable of coping with high-speed rotation while avoiding it.
[0007]
Another object of the present invention is to provide a material application apparatus capable of expanding the degree of freedom in design without restricting the capacity or size of a syringe.
[0008]
Still another object of the present invention is to provide a material capable of applying a material with high accuracy along a set locus without causing a positional shift of a rotation center axis even when a nozzle is rotated in a circumferential direction. An object of the present invention is to provide a coating device.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an application unit for applying a material to an application surface of a work disposed on a base, and a relative movement of the application unit along a predetermined movement locus on the application surface. In a material coating apparatus having a moving means capable of coating the material in a bead shape by causing
The coating means includes a syringe and a nozzle connected to the syringe and having a non-circular discharge port.
The nozzle is provided so as to be rotatable in the circumferential direction without rotating the syringe in the circumferential direction. With such a configuration, when the movement trajectory is set in a two-dimensional direction, that is, when the movement trajectory is set in a closed loop or a direction along a curve, the nozzle is rotated in the circumferential direction, so that A bead having a stable cross-sectional shape can be formed while keeping the positional relationship of the discharge port with respect to the application surface constant. In addition, since the syringe does not rotate in the circumferential direction, it is also free from restrictions on the capacity of the syringe.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, a motor having an output shaft positioned substantially parallel to the nozzle is disposed, and the nozzle is rotatably provided in the circumferential direction by disposing a power transmission member between the output shaft and the nozzle. The configuration is adopted. Examples of the power transmission member include a belt that interconnects the output shaft and the nozzle, and a gear mechanism. With such a configuration, the member to be rotated in the circumferential direction is a relatively lightweight and sufficient nozzle, so that even if a small motor is adopted, the expected performance can be sufficiently exhibited, and Therefore, it is possible to keep the rotation center axis of the nozzle constant by approaching the distance between the drive source and the discharge port, and thus to precisely discharge the material discharged from the discharge port along a predetermined locus. It becomes possible to apply. Further, since the moment of inertia associated with the rotation of the nozzle can be reduced, the load on the motor can be reduced from this point as well.
[0011]
Further, the discharge port of the nozzle according to the present invention has an opening in which a first end located at a front end side along the movement locus has a wider width in a direction crossing the movement locus than a second end located at a rear end side. It is good to constitute by what has a shape. As the shape of the discharge port, an opening shape is used in which a first end located at a front end side along the movement trajectory has a wider width in a direction crossing the movement trajectory than a second end located at a rear end side. In particular, it is preferable to provide an opening in the shape of an acute triangle having a base portion and a pair of side portions forming two equal sides longer than the base portion. At this time, while the bottom side is the first end, the intersection of the side sides is moved as the second end, so that the first end having a large width in the direction crossing the movement trajectory is formed. The corresponding bead portion is grounded on the surface to be coated before the bead portion corresponding to the second end portion, so that a bead having a cross-sectional shape in which the upper end is narrower than the lower end can be reliably formed.
[0012]
Further, it is preferable that the material is given an appropriate viscosity and thixotropy in order to maintain the above-mentioned coating shape. For example, when forming a bead in which the width of the first end is about 1 mm to 1.5 mm, the viscosity may be set to 10,000 cP to 400,000 cP and the thixotropic ratio may be set to 4 to 10. In this case, if the viscosity is less than 10,000 cP, the shape at the time of application cannot be maintained, and if the viscosity exceeds 400,000 cP, application becomes difficult or stringing of the applied material occurs, and horn-like projections are easily formed. When the thixotropy ratio is less than 4, the shape cannot be maintained, and when the thixotropy ratio exceeds 10, stringiness of the applied material occurs and horn-like projections are easily formed. In addition, when the application bead is formed in a one-stroke shape (such as a ring shape), it is also preferable to adjust the properties of the material so that the material adapts to the overlapped portion in order to overlap the application start point and the application end point. .
[0013]
In addition, in order to maintain the above-mentioned application shape, in addition to the viscosity and the thixo ratio, for example, the properties of the material such as specific gravity and the properties of the material (in the case of a resin that reacts by moisture or heat, the temperature and humidity during application) The material may be adjusted after considering the thickness and length of the bead to be formed.
[0014]
Furthermore, it is preferable to adopt a configuration in which the relative movement speed of the surface to be coated and the nozzle is substantially matched with the discharge speed of the material from the front end discharge port. Thereby, a bead having a cross-sectional shape having a height larger than the width can be formed more reliably.
[0015]
The distance between the discharge port and the surface to be coated may be set to be about 1.5 to 3 times the height of the bead. If the separation distance is less than 1.5 times the height of the bead, the vertices of the bead such as a triangular cross section tend to be crushed, and if the separation distance exceeds 3 times the height of the bead, the bead unevenly undulates. Or a deviation from the application position may occur.
[0016]
The “section” used in the bead in the present specification means a longitudinal section in a direction substantially perpendicular to the extending direction of the bead, unless otherwise specified. The “width” and “height” used for the bead mean the dimension in the horizontal direction and the dimension in the vertical direction in the cross section of the bead shown in FIG.
[0017]
The “thixotropic ratio” means the ratio of the measured values when the viscosity of the material is measured while changing the rotation speed of the rotary viscometer, and specifically, the viscosity ratio obtained by the measurement according to JIS K7117. In other words, it means the ratio of the viscosity at 2 revolutions per minute to the viscosity at 20 revolutions per minute using a BH-type rotational viscometer (Rotor No. 7).
[0018]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a schematic perspective view of the material application apparatus according to the present embodiment, and FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a partial schematic perspective view of a workpiece to be coated with a material. In these drawings, a material coating apparatus 10 includes a base 11 and a syringe that can move along a movement locus set in advance with respect to a coating surface S of a workpiece W disposed on the base 11 via a table T. An application unit 14 including the nozzle 12 and the nozzle 13, a rotating mechanism 15 for rotating the nozzle 13 in the circumferential direction, and a moving unit 16 for moving the application unit 14 in three orthogonal axes are configured.
[0020]
As shown in FIG. 2, the syringe 12 is fixed to brackets 21 and 21 at two positions in the axial direction at an upper position of the holding body 20 which is vertically oriented. The syringe 12 is configured such that a resin material used as a sealant, an adhesive, or the like is filled and accommodated therein via a supply pipe 22. The material accommodated in the syringe 12 is a non-illustrated casing. It is possible to discharge from the discharge port 24 located at the lower end of the nozzle 13 by the pressing force of the pressure device. Here, as the material, an epoxy resin, a silicone resin, a urethane resin, an acrylic resin, a rubber, or a modified product thereof, the viscosity is set to 10,000 cP to 400,000 cP, and the thixo ratio is Those set to 4 to 10 are used.
[0021]
The nozzle 13 is provided so as to be rotatable in the circumferential direction through a connection pipe 25 provided at the upper end on the lower end side of the syringe 12. The nozzle 13 is rotatably supported at two upper and lower positions via an upper bearing plate 27 and a lower bearing plate 28 fixed to two lower portions of the holder 20. A motor M capable of normal and reverse rotation is supported at an upper surface position of the upper bearing plate 21, and an output shaft 30 of the motor M penetrates the upper bearing plate 27 in a vertical direction and is substantially parallel to the nozzle 13. It extends vertically downward. While a pulley 32 is fixed to the output shaft 30, a large-diameter pulley 33 is also fixed to the outer peripheral side of the nozzle 13, and a belt 34 as a power transmission member is stretched between these pulleys 32, 33. . Therefore, when the motor M is driven, the nozzle 13 can rotate in the circumferential direction without rotating the syringe 12 in the circumferential direction. Here, the rotation mechanism 15 of the nozzle 13 is configured by the motor M, the pulleys 32 and 33, and the belt 34.
[0022]
As shown in FIG. 4, in the nozzle 13, the discharge port 24 includes a base 36 and a pair of equilateral sides having an apex P at an intersection extending diagonally upward from both ends of the base 36 and intersecting with each other. It is provided in the shape of an opening provided with side portions 37 and 37. The side length of the side portion 37 is formed longer than the side length of the bottom side portion 36, so that the discharge port 24 is formed as an acute isosceles triangular opening. Due to such a shape of the discharge port 24, a bead B formed of the material discharged from the discharge port 24 has a cross section of an acute isosceles triangle substantially corresponding to the shape of the discharge port 24, as shown in FIG. It is possible to obtain a relatively slim section having a shape, in other words, a height H larger than the width BW. In the present embodiment, although not particularly limited, the width of the bottom 36 of the discharge port 24 is set to about 1.3 mm, while the shortest distance between the bottom 36 and the vertex P, that is, the discharge port 24 is set to about 1.6 mm. The bead B formed by using the nozzle 13 having such a size and setting the temperature at the time of application to about 25 ° C. has a width BW of about 1.3 mm and a height H of about 1.4 mm. I have.
[0023]
As shown in FIG. 1, the moving means 15 includes a support 41 provided along a rail 40 on the base 11 so as to be movable in the X-axis direction (left-right direction) in the figure, and an upper part of the support 41. A slider 44 movably supported in a Y-axis direction (a direction perpendicular to the paper surface) in FIG. 1 along a rail 42 arranged in a cantilever posture, and a coating means 14 provided on the slider 44 so as to be movable in a vertical direction. And the holding body 20 that holds the The support 41, the slider 44, and the holder 20 in this embodiment are controlled in a predetermined manner via a drive mechanism (not shown) such as a motor, a feed screw shaft, or a cylinder, and a control device that controls the drive mechanism as a whole. Note that the moving unit 15 is not limited to the above-described configuration, and any other means can be used as long as the syringe 12 and the nozzle 13 connected thereto can be relatively moved with respect to the application surface S of the work W. A structure can also be adopted. Further, in the present embodiment, the syringe 12 and the nozzle 13 are movable in three orthogonal axes, but the work W may be provided so as to be movable in three orthogonal axes.
[0024]
The nozzle 13 moves on a predetermined trajectory in a state where the distance between the discharge port 24 and the surface S to be coated is substantially constant, and the distance at this time is the height of the obtained bead B. H, that is, about 1.5 to 3 times the shortest distance between the top P and the bottom 36 of the discharge port 24. Further, the moving speed of the nozzle 13 along the moving locus is set to a speed substantially coincident with the discharge speed of the material from the discharge port 24, and is set to 50 mm / s or less in the present embodiment.
[0025]
When the nozzle moves along the movement locus, the base 36 is positioned on the front end side in the traveling direction on the movement locus, while the vertex P is positioned on the rear end side, and the base 36 is moved along the movement locus. , The nozzle 13 is controlled to rotate so as to cross in a direction substantially orthogonal to the plane. For this reason, the base 36 constitutes a first end located on the front end side in the traveling direction on the trajectory, while the vertex P constitutes a second end located on the rear end side in the traveling direction of the trajectory. The base 36 whose width in the direction crossing the trajectory is wider than the vertex P moves along the trajectory before the vertex P.
[0026]
Although not shown, in the present embodiment, a mechanism for finely adjusting the position of the discharge port 24 is disposed near the coating means 14. In such a case, the origin position can be adjusted, and even if an error occurs, a correction operation can be easily performed.
[0027]
Next, a material application operation in the material application apparatus 10 will be described.
[0028]
In a state where the work W is positioned on the table T at a predetermined position, the nozzle 13 is caused to perform a teaching operation, and the movement trajectory is taken as data into a control device (not shown). Then, when a switch (not shown) is turned on, as shown in FIG. 6, the nozzle 13, that is, the discharge port 24 moves toward the start point S1, and when the discharge port 24 is located at the start point S1, the discharge port 24 The discharge of the material is started, and the material moves along the predetermined movement trajectory from the start point S1 based on the teaching data while continuing the discharge. At this time, even in the case where the movement trajectory is curved, as in the areas indicated by A, B, and C in FIG. 6, the discharge port 24 is such that the bottom 36 always precedes the vertex P, and The rotation of the nozzle 13 is controlled so as to cross the movement locus. In the material applied on the application surface S of the work W in this manner, a bead B having a substantially triangular cross section corresponding to the discharge port 24 is formed. Here, the portion of the bead B corresponding to the bottom 36 is grounded on the coating surface S, and the portion of the bead B corresponding to the vertex P is located on the upper end side.
[0029]
Therefore, according to such an embodiment, the material is discharged in the same direction as the flow direction of the material in the nozzle 13, and the shape of the discharge port 24 of the nozzle 13 is substantially an acute triangle, so that a weak pressing force is applied. However, it is possible to reliably form the bead B capable of securing a large amount of deformation. Further, since the configuration is such that only the nozzle 13 is rotated without rotating the syringe 12 in the circumferential direction, high-speed rotation can be realized, and the material application efficiency can be improved.
[0030]
As described above, the best configuration and method for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this.
[0031]
That is, although the present invention has been particularly shown and described mainly with respect to a specific embodiment, without departing from the scope of the technical idea and the purpose of the present invention, the shape, position, or A person skilled in the art can make various changes as necessary regarding the arrangement and the like. For example, in the above embodiment, the nozzle 13 is rotated by using the motor M as a drive source. However, when the movement locus of application is a gentle curve that does not suddenly change in the two-dimensional direction, the nozzle A projecting piece may be provided around the axis, a rod of a cylinder may be connected to the projecting piece, and the nozzle may be rotated by moving the rod forward and backward.
[0032]
Further, the shape of the discharge port 24 may be a shape having various contours as long as the discharge port 24 is provided in a non-circular shape capable of forming a bead B having a cross section having a height H larger than the width BW. Can be. For example, a discharge port having a trapezoidal outer shape is applied, and a bead B having a trapezoidal cross-sectional shape can be formed, or a discharge port having a ball-shaped outer shape is applied, and the cross-sectional shape is reduced. One that can form a bead B having a shape can be exemplified.
[0033]
【The invention's effect】
As described above, according to the present invention, since the nozzle is configured to rotate, the capacity or size of the syringe does not matter, and the nozzle can be rotated at high speed. Further, since high-speed rotation is enabled, the coating speed can be increased, and the coating efficiency can be improved. In addition, even when the nozzle is rotated, the position of the rotation center axis can be kept constant, and the material discharged from the discharge port can be applied along the predetermined locus without displacement. It becomes possible. In addition, since the moment of inertia associated with the rotation of the nozzle can be reduced, the size of the motor can be reduced, which is advantageous in terms of cost, and the area of the application means can be reduced in weight.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a material application apparatus according to an embodiment.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a schematic perspective view showing a state where a material is applied to a work.
FIG. 4 is a schematic perspective view of the nozzle viewed from a discharge port side.
FIG. 5 is a sectional view showing a shape of a bead.
FIG. 6 is a plan view showing a discharge port position of a nozzle when applying a material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Material application apparatus 11 Base 12 Syringe 13 Nozzle 14 Coating means 16 Moving means 24 Discharge port 30 Output shaft 34 Belt 36 Bottom side 37 Side M Motor P Vertex (intersection)
W Work S Coated surface

Claims (5)

A coating means for applying a material to a coating surface of a workpiece disposed on a base, and the material being applied in a bead shape by relatively moving the coating means along a predetermined movement locus on the coating surface. And a moving means for moving the material.
The coating means includes a syringe and a nozzle connected to the syringe and having a non-circular discharge port.
The material coating device, wherein the nozzle is provided so as to be rotatable in a circumferential direction without rotating the syringe in a circumferential direction. A motor having an output shaft positioned substantially parallel to the nozzle is arranged, and the power transmission member is arranged between the output shaft and the nozzle so that the nozzle is rotatably provided in the circumferential direction. The material application device according to claim 1, wherein The discharge port of the nozzle has an opening shape in which a first end located at a front end side along the movement trajectory has a width in a direction crossing the movement trajectory wider than a second end located at a rear end side. The material application device according to claim 1, wherein The material coating apparatus according to claim 3, wherein the discharge port of the nozzle is provided in a shape of an acute triangle having a base portion and a pair of side portions forming two equal sides longer than the base portion. . 5. The material application apparatus according to claim 4, wherein the nozzle moves the intersection of the side edge as the second end while the bottom edge is the first end.

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