JP7253447B2 - Component mounting device and its mounting head - Google Patents

Description

The present invention relates to a component mounting apparatus and its mounting head, and more particularly to a component mounting apparatus and its mounting head having a plurality of nozzles arranged side by side for picking up a component and mounting it on a board.

2. Description of the Related Art Conventionally, there has been known a component mounting apparatus provided with a plurality of nozzles arranged side by side for picking up components and mounting them on a substrate (see, for example, Patent Document 1).

The aforementioned Patent Document 1 discloses a surface mounter (component mounting apparatus) that includes a plurality of suction nozzles (nozzles) that are arranged side by side to suck and mount components on a substrate. This surface mounter has a mounting shaft device on which a plurality of suction nozzles are arranged.

The mounting shaft device of Patent Document 1 includes a spline shaft and a nozzle holding member. The spline shaft is configured to be capable of both rotational motion about the axis of the spline shaft and linear motion along the axis. The nozzle holding member is attached to the tip of the spline shaft. The nozzle holding member holds one of the plurality of nozzles.

The mounting shaft device of Patent Document 1 has a shaft-side facing surface and a holding-side facing surface that face each other in the direction in which the axis of the spline shaft extends. The shaft-side facing surface is provided on the spline shaft. The holding-side facing surface is provided on the nozzle holding member.

In the mounting shaft device of Patent Document 1, when the spline shaft is moved to the upper end in the direction in which the axis extends, the shaft-side facing surface and the holding-side facing surface come close to each other.

WO2017/081775

Here, although not specified in Patent Document 1, each of the shaft-side facing surface and the holding-side facing surface has a spline shaft in a state where the spline shaft is moved to the upper end in the direction in which the axis extends. It is considered that the lubricant is applied in order to reduce the resistance generated on the contact surface between the shaft-side facing surface and the holding-side facing surface when rotating around the axis.

However, the spline shaft is urged upward by the urging member, and the lubricant applied to each of the shaft-side facing surface and the holding-side facing surface is sandwiched between the shaft-side facing surface and the holding-side facing surface. Compressed. Due to this, the lubricant escapes to the outside of the portion between the shaft-side facing surface and the holding-side facing surface. Therefore, when the spline shaft is rotated around the axis in this state, a lubricating film having a sufficient thickness is not formed between the shaft-side facing surface and the holding-side facing surface. There is an inconvenience that the spline shaft rotates while a large resistance is generated between the spline shaft and the surface in proportion to the force due to the biasing. For this reason, in the conventional component mounting apparatus having the configuration described above, when the spline shaft (nozzle shaft) is rotated in a state in which the shaft-side facing surface and the holding-side facing surface are brought close to each other, the shaft-side facing surface and the holding-side facing surface is desired to be sufficiently reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a component mounting apparatus and its mounting head capable of sufficiently reducing the resistance between the shaft-side facing surface and the holding-side facing surface. is to provide

In order to achieve the above object, the inventors of the present application conducted intensive studies. It was found that the resistance between the opposing surfaces can be sufficiently reduced. That is, a component mounting apparatus according to a first aspect of the present invention comprises a mounting head including a plurality of nozzles arranged side by side for picking up a component and mounting it on a substrate, and the mounting head is located at the center of each of the plurality of nozzles. a nozzle shaft having a moving portion that rotates in the circumferential direction around the axis and moves up and down; a shaft-side facing surface perpendicular to the direction in which the central axis extends; a nozzle holding member having a holding-side facing surface facing the shaft-side facing surface in the direction in which the axis extends, and arranged intermittently along the circumferential direction on at least one of the holding-side facing surface and the shaft-side facing surface. A plurality of recesses are formed to hold the lubricant by recessing in the direction in which the central axis extends.

In the component mounting apparatus according to the first aspect of the present invention, as described above, at least one of the holding-side facing surface and the shaft-side facing surface is intermittently arranged along the circumferential direction and has depressions extending in the direction of the central axis. , forming a plurality of recesses that retain lubricant. As a result, even if the lubricant escapes to the outside between the shaft-side facing surface and the holding-side facing surface because it is sandwiched and compressed between the shaft-side facing surface and the holding-side facing surface, the lubricant does not flow around the nozzle shaft. When rotating in the direction, the lubricant held in the plurality of recesses enters the region other than the recesses, and the levitation force causes the distance between the shaft-side facing surface and the holding-side facing surface to widen. It was found that the escaped lubricant can be returned to the inside by relaxing the As a result, when the nozzle shaft is rotated with the shaft-side facing surface and the holding-side facing surface brought close to each other, a sufficiently thick lubricating film is formed between the shaft-side facing surface and the holding-side facing surface. Therefore, the resistance between the shaft-side facing surface and the holding-side facing surface can be sufficiently reduced. Here, the levitation force is defined as, when the lubricant enters from the concave portion to the area other than the concave portion, the lubricant that has entered is compressed into a high-pressure lubricant, and the edge of the concave portion is deformed into a tapered shape by the high-pressure lubricant. It is believed that this is the result of more lubricant entering areas other than the recesses (wedge effect). In addition, it is considered that the levitation force acts to separate the shaft-side facing surface and the holding-side facing surface. Further, by forming a sufficiently thick lubricating film between the shaft-side facing surface and the holding-side facing surface, contact between the shaft-side facing surface and the holding-side facing surface can be suppressed. The amount of dust generated by contact between the side facing surface and the holding side facing surface can be reduced. Further, by forming a sufficiently thick lubricating film between the shaft-side facing surface and the holding-side facing surface, it is possible to reduce the wear of each of the shaft-side facing surface and the holding-side facing surface. It is possible to suppress an increase in the surface roughness of the shaft-side facing surface and the holding-side facing surface. As a result, when the nozzle shaft is rotated while the shaft-side facing surface and the holding-side facing surface are brought close to each other, the vibration of the nozzle shaft can be suppressed. It is possible to suppress deterioration in mounting quality due to dropping.

In the component mounting apparatus according to the first aspect of the present invention, preferably, the recess is configured such that when the holding-side facing surface of the nozzle holding member rotates together with the moving part relative to the shaft-side facing surface , the holding-side facing surface and the shaft-side facing surface so that the holding-side facing surface is relatively floated and separated from the shaft-side facing surface by the levitation force generated by the entry of the lubricant held in the recess. is configured to With such a configuration, even if the nozzle escapes to the outside between the shaft-side facing surface and the holding-side facing surface, the nozzle shaft is prevented from moving in the circumferential direction by being sandwiched between the shaft-side facing surface and the holding-side facing surface. A sufficient distance can be ensured between the shaft-side facing surface and the holding-side facing surface by relatively floating and separating the shaft-side facing surface and the holding-side facing surface by the levitation force generated during rotation. can. As a result, the lubricant that has escaped to the outside between the shaft-side facing surface and the holding-side facing surface can be returned to the inside. When rotated, a sufficiently thick lubricating film is formed between the shaft-side facing surface and the holding-side facing surface, so that the resistance between the shaft-side facing surface and the holding-side facing surface is sufficiently reduced. be able to.

In this case, preferably, the mounting head further includes a housing to which the nozzle shaft is attached, and a biasing member that biases the moving portion of the nozzle shaft in an upward direction to position the moving portion of the nozzle shaft at the upper end position, The nozzle shaft is fixed to the housing and further has a fixed portion provided with a shaft-side facing surface, and a moving portion disposed on the fixed portion so as to rotate in the circumferential direction and move up and down in the direction in which the central axis extends. In the state in which the moving portion of the nozzle shaft is positioned at the upper end position by the biasing member, the holding-side opposing surface of the nozzle holding member rotates together with the moving portion relative to the shaft-side opposing surface provided on the fixed portion. In this case, the holding-side facing surface is lifted and separated from the shaft-side facing surface provided on the fixed portion. With this configuration, by utilizing the relative movement of the moving portion in the circumferential direction and the direction in which the central axis extends with respect to the fixed portion fixed to the housing, the concave portion causes the holding side facing surface to move toward the shaft side facing surface. Therefore, the holding-side facing surface can be floated from the shaft-side facing surface with a simple structure. In addition, since a sufficiently thick lubricating film is formed between the shaft-side facing surface and the holding-side facing surface, the resistance between the shaft-side facing surface and the holding-side facing surface can be sufficiently reduced. In other words, even if the nozzle shaft is rotated at the upper end position, a large resistance proportional to the force urging the nozzle shaft does not occur between the shaft-side facing surface and the holding-side facing surface. Therefore, the biasing force of the biasing member can be increased. As a result, the movement of the moving part in the direction in which the center axis extends can be made faster, so that the mounting work time can be shortened.

In the component mounting apparatus configured to float and separate the holding-side facing surface relative to the shaft-side facing surface by the levitation force, it is preferable that a gap between the holding-side facing surface and the shaft-side facing surface is A lubricating film containing a lubricant is formed in a region other than the recess by separating the shaft-side facing surface and the holding-side facing surface. With this configuration, by separating the shaft-side facing surface and the holding-side facing surface, the lubricant escaped to the outside between the shaft-side facing surface and the holding-side facing surface is filled to form a lubricating film. Therefore, the resistance generated when the nozzle shaft rotates can be reduced. As a result, it is possible to reduce the heat generation of the drive source for rotating the nozzle shaft, and to reduce the size of the mounting head compared to the case where a ball bearing is provided to reduce the resistance, and the same drive. It is possible to increase the number of nozzle shafts rotatable by the source and to speed up the rotation of the nozzle shafts by the same drive source.

In this case, preferably, the mounting head includes a nozzle pressing member for selectively moving up and down desired nozzles among a plurality of nozzles held by the nozzle holding member via the nozzle shaft, and a nozzle pressing member for moving the desired nozzles in the circumferential direction. and a rotating mechanism for rotating other nozzles than the desired nozzle in the circumferential direction along with the rotation of the desired nozzle, wherein the lubricating film is formed on the holding side of the nozzle holding member holding the other nozzles. It is formed between the facing surface and the shaft-side facing surface of the nozzle shaft to which another nozzle is attached. With this configuration, it is possible to reduce the resistance generated when the nozzle shaft rotates in nozzles other than the desired nozzle, so that the load on the rotation mechanism can be reduced.

In the component mounting apparatus according to the first aspect, preferably, the concave portion formed in at least one of the holding-side facing surface and the shaft-side facing surface is line-symmetrical with respect to the center line extending along the direction in which the center axis extends. have a shape. With this configuration, the same levitation force can be generated in any direction of rotation of the nozzle shaft, so that the resistance between the shaft-side facing surface and the holding-side facing surface can be stably and sufficiently reduced. can do.

In the component mounting apparatus according to the first aspect, preferably, the concave portion is formed in a hemispherical shape and has a plurality of hemispherical portions circumferentially arranged at intervals in the circumferential direction, and the plurality of hemispherical portions are also radially arranged at intervals in a radial direction orthogonal to the direction in which the central axis extends when viewed from the direction in which the central axis extends. With this configuration, the plurality of hemispherical portions are circumferentially and radially distributed over the entire surface, so that uneven lifting force can be suppressed.

In this case, preferably, the diameter of each of the plurality of hemispherical portions is formed so as to increase radially outward. With this configuration, the lubricant in the hemispherical portion tends to enter the area other than the hemispherical portion in a larger amount at the outer end of the nozzle shaft where the rotation speed is relatively high, and a larger amount of lubricant is required in the area. Since the amount of lubricant retained can be increased as much as can be distributed to

In the component mounting apparatus according to the first aspect, preferably, a plurality of recesses are arranged at intervals in the circumferential direction, the plurality of recesses have a plurality of grooves arranged at intervals in the circumferential direction, The plurality of grooves are radially arranged by each extending in a radial direction orthogonal to the direction in which the central axis extends when viewed from the direction in which the central axis extends. With this configuration, the plurality of grooves are formed at intervals in the circumferential direction and also extend in the radial direction. be able to.

In this case, preferably, the width of each of the plurality of grooves in the circumferential direction increases toward the outer side in the radial direction. With this configuration, more lubricant in the grooves is likely to enter areas other than the grooves at the outer end of the nozzle shaft where the rotational speed is relatively high, and the areas requiring a larger amount of lubricant are retained. Since the amount of lubricant can be increased, the lubricant held in the plurality of grooves can be spread over the entire region other than the grooves between the holding-side facing surface and the shaft-side facing surface.

In the component mounting apparatus according to the first aspect, preferably, at least one of the holding-side facing surface and the shaft-side facing surface has a plurality of recesses extending along the circumferential direction and connecting the plurality of recesses to each other, and the direction in which the central axis extends. A connection groove is formed that is recessed toward the center axis, and the depth of the recess is greater than the depth of the connection groove in the direction in which the central axis extends. With this configuration, the connecting groove can function as a path for the lubricant between the recesses, so that the lubricant can be easily distributed to the plurality of recesses by the connecting groove. As a result, the lubricant held in the plurality of recesses can be made substantially uniform, so that the lubricant can be spread substantially uniformly over the regions other than the recesses between the holding-side facing surface and the shaft-side facing surface. be able to.

A mounting head according to a second aspect of the present invention comprises a plurality of nozzles arranged side by side for picking up a component and mounting it on a substrate, and the plurality of nozzles rotating in the circumferential direction around the central axis and moving up and down. and a shaft-side facing surface perpendicular to the direction in which the central axis extends; and a nozzle shaft attached to the moving portion to hold each of the plurality of nozzles, facing the shaft-side facing surface in the direction in which the central axis extends. and a nozzle holding member having a holding-side facing surface, at least one of the holding-side facing surface and the shaft-side facing surface being intermittently arranged along the circumferential direction and recessed in the direction in which the central axis extends to receive the lubricant. A plurality of holding recesses are formed.

In the mounting head according to the second aspect of the present invention, as described above, at least one of the holding-side facing surface and the shaft-side facing surface is intermittently arranged along the circumferential direction and recessed in the direction in which the central axis extends, A plurality of recesses are formed to hold the lubricant. As a result, the lubricant applied to at least one of the shaft-side facing surface and the holding-side facing surface is applied to each of the shaft-side facing surface and the holding-side facing surface by being sandwiched between the shaft-side facing surface and the holding-side facing surface. Even if the lubricant escapes to the outside, when the nozzle shaft rotates in the circumferential direction, the lubricant held in the plurality of recesses enters the region other than the recesses, and the levitation force generated causes the lubricant to move between the shaft-side facing surface and the holding-side facing surface. We have learned that the escaped lubricant can be returned to the inside because the space between the surfaces is widened. As a result, when the nozzle shaft is rotated with the shaft-side facing surface and the holding-side facing surface brought close to each other, a sufficiently thick lubricating film is formed between the shaft-side facing surface and the holding-side facing surface. Therefore, it is possible to obtain a mounting head capable of sufficiently reducing the resistance between the shaft-side facing surface and the holding-side facing surface.

According to the present invention, as described above, the resistance between the shaft-side facing surface and the holding-side facing surface can be sufficiently reduced.

1 is a plan view showing an outline of a component mounting apparatus according to first and second embodiments; FIG. 1 is a perspective view showing a mounting head of a component mounting apparatus according to first and second embodiments; FIG. It is a front view showing a mounting head of the component mounting apparatus according to the first embodiment. 4 is a front view showing the nozzle shaft and nozzle holding member of the mounting head according to the first embodiment; FIG. 4 is an enlarged cross-sectional view showing a state in which the nozzle shaft is arranged at the lower end position in the mounting head according to the first embodiment; FIG. 4 is an enlarged cross-sectional view showing a state in which the nozzle shaft of the mounting head according to the first embodiment is arranged at the upper end position; FIG. 4 is an enlarged cross-sectional view showing a state in which the nozzle shaft of the mounting head according to the first embodiment is arranged at the upper end position and the nozzle shaft is rotated; FIG. 4 is a perspective view showing a nozzle holding member of the mounting head according to the first embodiment; FIG. 4 is a plan view showing a nozzle holding member of the mounting head according to the first embodiment; FIG. FIG. 4 is a cross-sectional view showing the shaft-side facing surface and the holding-side facing surface of the mounting head according to the first embodiment when the nozzle shaft is arranged at the upper end position; FIG. 4 is a cross-sectional view showing the shaft-side facing surface and the holding-side facing surface of the mounting head according to the first embodiment, with the nozzle shaft arranged at the upper end position and the nozzle shaft rotated. 11. It is an enlarged view of the K part of FIG. FIG. 11 is a perspective view showing a holding member of the mounting head according to the first modified example of the first embodiment; FIG. 11 is a perspective view showing a nozzle holding member of a mounting head according to a second modified example of the first embodiment; FIG. 8 is an enlarged cross-sectional view showing a state in which the nozzle shaft of the mounting head according to the second embodiment is arranged at the lower end position; FIG. 10 is an enlarged cross-sectional view showing a state in which the nozzle shaft of the mounting head according to the second embodiment is arranged at the upper end position and the nozzle shaft is rotated. FIG. 11 is a perspective view showing a fixing portion having a concave portion of the mounting head according to the second embodiment; FIG. 11 is a perspective view showing a fixing portion having a concave portion of a mounting head according to a modified example of the second embodiment; FIGS. 19A to 19D are plan views showing the holding-side facing surface with 1, 2, 4, and 8 recesses in the mounting head according to the third modification of the first embodiment, respectively. is. FIGS. 20(A) and 20(B) each show a holding-side facing surface in which the size of the concave portion in the radial direction increases toward the outside in the mounting head according to the fourth modification of the first embodiment. is a plan view. FIG. 21A is a plan view showing the holding side facing surface of the mounting head of the fifth modification according to the first embodiment. FIG. 21B is a cross-sectional view along the R2 direction of the holding-side facing surface of the mounting head of the fifth modification according to the first embodiment. FIGS. 22A to 22D are plan views showing the holding-side opposing surface of the mounting head according to the sixth modification of the first embodiment, with the number of recesses being 1, 2, 4, and 8, respectively. is. FIGS. 23A to 23D respectively show 1, 2, 4, and 8 sets of recesses arranged in the radial direction in the mounting head according to the seventh modification of the first embodiment. FIG. 10 is a plan view showing the holding-side facing surface. 24(A) and 24(B) respectively show, in the mounting head according to the eighth modification of the first embodiment, the size of the concave portion in the radial direction increases toward the outside, and there are five concave portions in the radial direction. FIG. 4 is a plan view showing a shaft-side facing surface in which four and eight groups of recesses are arranged in the circumferential direction;

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

[First embodiment]
The configuration of a component mounting apparatus 100 according to the first embodiment will be described with reference to FIGS. 1 to 12. FIG.

As shown in FIG. 1, the component mounting apparatus 100 is configured to mount electronic components E such as ICs, transistors, capacitors and resistors on a substrate B such as a printed circuit board. Note that the electronic component E is an example of the "component" in the scope of claims.

Here, in the component mounting apparatus 100, the direction in which the board B is transported is defined as the X1 direction, the direction opposite to the direction in which the board B is transported is defined as the X2 direction, and the combined direction of the X1 direction and the X2 direction is defined as the X direction. . Also, of the horizontal directions, the direction orthogonal to the X direction is the Y direction, one of the Y directions is the Y1 direction, and the other Y direction is the Y2 direction. The vertical direction perpendicular to the X and Y directions is defined as the Z direction (vertical direction), one of the Z directions is defined as the Z1 direction (upward), and the other Z direction is defined as the Z2 direction (downward). Note that the Z direction is an example of "the direction in which the central axis extends" in the scope of claims.

The component mounting apparatus 100 includes a base 1, a feeder placement section 2, a board transfer section 3, a support section 4, a rail section 5, a mounting head 6, a component recognition camera 7, a board recognition camera 8, and a control unit 9 .

(base)
The base 1 is a base on which components are arranged in the component mounting apparatus 100 . A board transfer section 3, a rail section 5, and a component recognition camera 7 are provided on the base 1 as constituent elements. Further, a control unit 9 is provided inside the base 1 . Further, the base 1 is provided with feeder placement portions 2 on which a plurality of tape feeders 21 can be placed on both sides in the Y direction (the Y1 direction side and the Y2 direction side).

(tape feeder)
The tape feeder 21 is a device that supplies electronic components E to be mounted on the substrate B. As shown in FIG. The tape feeder 21 holds a reel (not shown) wound with a tape holding a plurality of electronic components E at predetermined intervals. Further, the tape feeder 21 is configured to rotate the reel and feed the tape in accordance with the component holding operation for taking out the electronic component E by the mounting head 6 . The tape feeder 21 is configured to feed the electronic component E from the leading end on the working position side by feeding the tape.

(substrate transfer unit)
The board transfer unit 3 is configured to load the board B from outside the component mounting apparatus 100 and transfer the board B in the transfer direction (X1 direction). The substrate transfer section 3 includes a pair of conveyor sections 31 and a drive motor (not shown) for rotating the pair of conveyor sections 31 . Each of the pair of conveyor units 31 has a pulley (not shown) and a loop-shaped conveying belt that is looped around the pulley. The control unit 9 is configured to control the transport speed of the substrate B placed on the pair of conveyor units 31 by controlling the drive motor.

(support part)
The support portion 4 is configured to support the mounting head 6 so as to be movable in the X direction. Specifically, the support portion 4 includes a ball screw shaft 41 extending in the X direction and an X-axis motor 42 that rotates the ball screw shaft 41 . The mounting head 6 is provided with a ball nut (not shown) that engages with the ball screw shaft 41 of the support portion 4 . When the ball screw shaft 41 is rotated by the X-axis motor 42 , the mounting head 6 is configured to be movable in the X direction together with the ball nut that engages with the ball screw shaft 41 .

(Rail part)
The pair of rail portions 5 are configured to support the support portion 4 so as to be movable in the Y direction. Specifically, the rail portion 5 includes a ball screw shaft 51 extending in the Y direction, a Y-axis motor 52 that rotates the ball screw shaft 51 , and a pair of guide rails 53 . The support portion 4 is provided with a ball nut (not shown) that engages with the ball screw shaft 51 of the rail portion 5 . A pair of guide rails 53 extends in the Y direction. When the ball screw shaft 51 is rotated by the Y-axis motor 52 , the support portion 4 is configured to be movable in the Y direction along the pair of guide rails 53 together with the ball nut engaged with the ball screw shaft 51 . there is

With such a configuration, the mounting head 6 is configured to be movable on the base 1 in the horizontal plane (in the X direction and the Y direction).

(mounting head)
The mounting head 6, as shown in FIG. 2, is a component mounting unit and is configured to mount an electronic component E on a substrate B fixed at a working position. Specifically, the mounting head 6 includes a plurality of nozzles 6a, a nozzle pressing member 6b, a first biasing member 6c, a circumferential moving mechanism 6d, an elevating mechanism 6e, a rotating mechanism 6f, and a revolving mechanism 6g. , a housing 6h, a second biasing member 6i, a nozzle shaft 6j, and a nozzle holding member 6k. The second biasing member 6i is an example of a "biasing member" in the scope of claims. Also, the rotation mechanism 6f is an example of a "rotation mechanism" in the scope of claims.

The plurality of nozzles 6a are arranged in a circle and configured to pick up the electronic component E and mount it on the substrate B. As shown in FIG. Each of the plurality of nozzles 6a has a tapered shape. Each of the plurality of nozzles 6a is connected to a pressure generator (not shown), and configured to hold (adsorb) the electronic component E by negative pressure generated by the pressure generator. Here, when holding (sucking) the electronic component E, a desired nozzle 6a out of the plurality of nozzles 6a is arranged at the suction position by arranging the nozzle shaft 5j at the lower end position Dw (see FIG. 4). be. Further, each of the plurality of nozzles 6a is configured so that the electronic component E can be mounted on the substrate B by switching the negative pressure generated by the pressure generator to positive pressure. After mounting the electronic component E, the desired nozzle 6a is placed in the raised position by placing the nozzle shaft 5j in the upper end position Up (see FIG. 3) by means of the second biasing member 6i.

Twelve nozzles 6a are arranged at equal angular intervals (approximately 30 degree intervals) around the rotation axis C1. Each of the plurality of nozzles 6a is held by a nozzle holding member 6k.

As shown in FIG. 3, the nozzle pressing member 6b is configured to selectively vertically move a desired nozzle 6a out of a plurality of nozzles 6a held by the nozzle holding member 6k via a nozzle shaft 6j. .

Specifically, the nozzle pressing member 6b is configured to be rotatable around the rotation axis C1. The nozzle pressing member 6b is connected to the circumferential movement mechanism 6d. The nozzle pressing member 6b is rotatable around the rotation axis C1 by the driving force of the circumferential movement mechanism 6d. Further, the nozzle pressing member 6b is configured to be movable in the direction (Z direction) in which the rotation axis C1 extends. Specifically, the nozzle pressing member 6b is connected to an elevating mechanism 6e. The nozzle pressing member 6b is movable in the direction in which the rotation axis C1 extends by the driving force of the lifting mechanism 6e.

The first biasing member 6c is configured to bias the nozzle pressing member 6b in the Z1 direction (upward). Specifically, the first biasing member 6c is formed of a coil spring. The first biasing member 6c biases the nozzle pressing member 6b in the Z1 direction (upward) to position it at the upper end position in the Z direction of the nozzle pressing member 6b.

In this manner, the nozzle pressing member 6b is moved by the circumferential movement mechanism 6d to the position of the desired nozzle 6a out of the plurality of nozzles 6a, and is lowered by the lifting mechanism 6e to move the desired nozzle out of the plurality of nozzles 6a. of the nozzle 6a is selectively lowered. After being lowered by the lifting mechanism 6e, the nozzle pressing member 6b is moved to the upper end position Up by the first biasing member 6c, thereby selectively raising the desired nozzles 6a.

The circumferential movement mechanism 6d is configured to move the nozzle pressing member 6b along the R1 direction, which is the direction of rotation about the rotation axis C1. Specifically, the circumferential movement mechanism 6 d has a rotating motor 60 , a rotating driving gear 61 , a rotating driven gear 62 and a rotating shaft 63 . Each of the driving gear 61 for rotation, the driven gear 62 for rotation, and the rotating shaft 63 rotates around a central axis extending in the Z direction. The driving gear 61 for rotation and the driven gear 62 for rotation are mechanically meshed and connected. The rotating shaft 63 is fixed to the driven gear 62 for rotation. The rotation shaft 63 rotates around the rotation axis C1 as the rotation drive gear 61 and the rotation driven gear 62 rotate as the rotation motor 60 is driven.

The lifting mechanism 6e is configured to move the nozzle pressing member 6b in the Z direction. Specifically, the elevating mechanism 6 e includes an elevating motor 64 , an elevating ball screw 65 , and an elevating section 66 . The lifting ball screw 65 rotates around the center axis extending in the Z direction by the driving force from the lifting motor 64 . The lifting section 66 is provided so as to press the nozzle pressing member 6b from the Z1 direction side. The lifting section 66 is configured to move in the Z direction without rotating integrally with the lifting ball screw 65 . As the elevation motor 64 is driven, the elevation ball screw 65 rotates and the elevation section 66 moves in the Z direction.

The rotation mechanism 6f is configured to rotate the desired nozzle 6a in the R2 direction around the central axis C2, and to rotate other nozzles in the R2 direction along with the rotation of the desired nozzle 6a. As a result, the posture of the electronic component E sucked by the desired nozzle 6a is corrected.

The rotation mechanism 6f includes a rotation motor 160, a rotation drive gear 161, a first rotation driven gear 162, a rotation shaft 163, a second rotation driven gear 164, and a third rotation driven gear 165. have.

Each of the rotation driving gear 161, the first rotation driven gear 162, the second rotation driven gear 164, the rotation shaft 163, and the third rotation driven gear 165 rotates around a central axis extending in the Z direction. Each of the first rotation driven gear 162 and the second rotation driven gear 164 is attached to the rotation shaft 163 . The third rotation driven gear 165 is attached to the nozzle shaft 6j. The rotation drive gear 161 and the first rotation driven gear 162 are mechanically meshed. The rotation shaft 163 connects the first rotation driven gear 162 and the second rotation driven gear 164 . The second rotation driven gear 164 and the third rotation driven gear 165 are mechanically meshed.

In the nozzle shaft 6j, as the rotation motor 160 is driven, the rotation drive gear 161, the first rotation driven gear 162, the second rotation driven gear 164, the rotation shaft 163, and the third rotation driven gear 165 are rotated. By rotating, it rotates in the R2 direction around the center axis C2. In this way, all of the multiple nozzle shafts 6j rotate synchronously. Also, all of the plurality of nozzles 6a rotate synchronously.

The revolving mechanism 6g is configured to rotate the plurality of nozzles 6a in the R1 direction around the rotation axis C1. The revolution mechanism 6g has a motor 166 for revolution and a shaft 167 for revolution.

The revolution shaft 167 rotates around a rotation axis C1 extending in the Z direction. The revolution shaft 167 connects the revolution motor 166 and the housing 6h. As the revolution motor 166 is driven, the revolution shaft 167 rotates, so that the housing 6h rotates in the R1 direction around the rotation axis C1. As a result, the plurality of nozzles 6a revolves around the rotation axis C1 in the direction R1 as the revolving motor 166 is driven and the revolving shaft 167 rotates.

The housing 6h is configured such that the rotation shaft 163 and the plurality of nozzle shafts 6j can be attached. Specifically, the housing 6h is formed with a plurality of through holes (not shown) for mounting the rotation shaft 163 and the plurality of nozzle shafts 6j.

The second biasing member 6i is configured to bias the nozzle shaft 6j in the Z1 direction (upward direction). Specifically, the second biasing member 6i is formed of a coil spring.

<Nozzle shaft>
As shown in FIG. 4, the nozzle shaft 6j is configured to rotate in the R2 direction around the center axis C2 of each of the plurality of nozzles 6a and to move up and down. That is, the nozzle shaft 6j has a fixed portion 68 and a moving portion 69. As shown in FIG. The fixed portion 68 is formed in a cylindrical shape extending in the Z direction. The fixed portion 68 is fixed to a through hole of the housing 6h. The moving part 69 is formed in a cylindrical shape extending in the Z direction. The length of the moving portion 69 is greater than the length of the fixed portion 68 in the Z direction. The moving portion 69 is arranged inside the fixed portion 68 so as to be movable in the R2 direction and the extending direction of the center axis C2. Specifically, the moving part 69 is movably supported by the fixing part 68 via a plurality of balls (not shown) inside the fixing part 68 . That is, the nozzle shaft 6j has a double cylinder shape in which the moving portion 69 is arranged inside the fixed portion 68. As shown in FIG. Here, the nozzle shaft 6j is configured to be positioned at the upper end position Up by the second biasing member 6i.

The nozzle shaft 6j also has a shaft-side facing surface 68a that faces a holding-side facing surface 168a, which will be described later, in the Z direction. The shaft-side facing surface 68 a is provided on the fixed portion 68 . The shaft-side facing surface 68a is perpendicular to the extending direction of the center axis C2. That is, the shaft-side facing surface 68a is a surface extending perpendicular to the extending direction of the central axis C2.

Further, the shaft-side facing surface 68a is a restricting surface that restricts movement of the nozzle shaft 6j in the Z1 direction. That is, when the nozzle shaft 6j rises in the Z1 direction, the holding-side facing surface 168a of the nozzle holding member 6k and the shaft-side facing surface 68a of the fixed portion 68 of the nozzle shaft 6j abut on each other at the upper end position Up. Movement of the shaft 6j in the Z1 direction is restricted. The end surface of the fixing portion 68 on the Z1 direction side is a restricting surface that restricts the movement of the nozzle shaft 6j in the Z2 direction. That is, when the nozzle shaft 6j descends in the Z2 direction, the nozzle pressing member 6b and the surface of the fixing portion 68 of the nozzle shaft 6j on the Z1 direction side come into contact with each other at the lower end position Dw. movement is restricted.

<Nozzle holding member>
As shown in FIG. 5, the nozzle holding member 6k is attached to the tip of the nozzle shaft 6j and configured to hold each of the plurality of nozzles 6a. Specifically, a press-fit recess 169a into which the Z1-direction end of the nozzle shaft 6j is press-fitted is formed in the Z1-direction side portion of the nozzle holding member 6k. A threaded hole 169b into which the nozzle 6a is screwed is formed in a portion of the nozzle holding member 6k on the Z2 direction side.

The nozzle holding member 6k also has a holding-side facing surface 168a that faces the shaft-side facing surface 68a in the Z direction. The holding-side facing surface 168a is provided at the boundary between the press-fit recess 169a and the screw hole 169b in the Z direction. The holding side facing surface 168a is orthogonal to the extending direction of the center axis C2. That is, the holding-side facing surface 168a is a surface extending perpendicular to the extending direction of the center axis C2.

<Recess>
As shown in FIGS. 5 and 6, when the nozzle shaft 6j is positioned at the upper end position Up, the holding side facing surface 168a contacts and slides (sliding). Lubricant G is applied to prevent movement. Here, the shaft-side facing surface 68a and the holding-side facing surface 168a move in the Z2 direction as the nozzle shaft 6j is pressed by the nozzle pressing member 6b, and the nozzle shaft 6j is positioned at the lower end position Dw (see FIG. 4). do not touch each other. Here, the lubricant G is applied to the holding side facing surface 168a in such an amount that the shaft side facing surface 68a and the holding side facing surface 168a are separated by a wedge effect.

The shaft-side facing surface 68a and the holding-side facing surface 168a come close to each other when the nozzle shaft 6j is moved from the lower end position Dw by the biasing force of the second biasing member 6i and the nozzle shaft 6j is positioned at the upper end position Up. ing. At this time, the lubricant G adhering to the adjacent region , which is the region where the shaft-side facing surface 68a contacts the holding-side facing surface 168a, is retained on the shaft-side facing surface 68a by the biasing force of the second biasing member 6i. By being sandwiched and compressed with the side facing surface 168a, it escapes in the direction perpendicular to the center axis C2. Then, the escaped lubricant G is accumulated in the vicinity area D of the inner portion and the outer portion between the shaft-side facing surface 68a and the holding-side facing surface 168a. The lubricant G may be a semi-solid (gel-like) lubricant G such as grease, or may be a liquid lubricant G.

As shown in FIG. 7, when the nozzle shaft 6j is positioned at the upper end position Up and the nozzle shaft 6j is rotated by the rotation mechanism 6f, the shaft-side facing surface 68a and the holding-side facing surface 168a of the first embodiment are in the vicinity area. It is configured to return the lubricant G accumulated in D to the adjacent area . That is, the shaft-side facing surface 68a and the holding-side facing surface 168a are sandwiched between the shaft-side facing surface 68a and the holding-side facing surface 168a with the nozzle shaft 6j positioned at the upper end position Up, and the lubricating film M becomes thin. The rotation of the nozzle shaft 6j is used to form a lubricating film M having a larger surface roughness than each of the shaft-side facing surface 68a and the holding-side facing surface 168a.

Specifically, as shown in FIGS. 8 and 9, on the holding-side facing surface 168a, a plurality (six) of lubricant G are intermittently arranged along the R2 direction and recessed in the Z2 direction to hold the lubricant G. is formed. Specifically, each of the plurality of concave portions 10 is configured by a groove portion 11 . That is, a plurality (six) of grooves 11 are formed in the holding side facing surface 168a. The plurality of grooves 11 are arranged at intervals in the R2 direction. Each of the plurality of grooves 11 is linearly provided along a direction perpendicular to the direction in which the central axis C2 extends. Each of the plurality of grooves 11 is radially arranged by extending in a radial direction orthogonal to the extending direction of the central axis C2 when viewed from the extending direction of the central axis C2. Here, each of the plurality of grooves 11 penetrates the radial end of the holding side facing surface 168a. The plurality of grooves 11 are arranged at approximately equal angular intervals in the R2 direction. In this manner, in the R2-direction cross section of the holding-side facing surface 168a, each of the plurality of grooves 11 and planes are periodically formed.

Further, as shown in FIG. 10, each of the plurality of grooves 11 has a generally arcuate shape recessed toward the Z2 direction in a cross section along the R2 direction. Specifically, the plurality of grooves 11 shown in FIG. 10 are shown by developing a cross section along line V2 with line V1 in FIG. 9 as a reference. Note that some of the plurality of grooves 11 shown in FIG. 10 are omitted. Here, the portions on both sides in the R2 direction of the inner peripheral surface of each of the plurality of recesses 10 are holding side facing surfaces 168a. The recessed portion 10 formed in the holding-side facing surface 168a has a shape symmetrical with respect to the center line C3 extending along the direction in which the center axis C2 extends.

As shown in FIG. 11, the recess 10 is held between the holding-side facing surface 168a and the shaft-side facing surface 68a when the nozzle shaft 6j rotates relative to the nozzle holding member 6k. The holding-side facing surface 168a is relatively lifted and separated from the shaft-side facing surface 68a by the floating force generated by the entry of the lubricating agent G. Specifically, when the nozzle shaft 6j is rotated relative to the nozzle holding member 6k in a state in which the nozzle shaft 6j is positioned at the upper end position Up by the second biasing member 6i, the recess 10 is formed on the holding side. The opposing surface 168a is configured to be relatively floated and spaced apart from the shaft-side opposing surface 68a provided on the fixing portion 68 .

That is, when the nozzle shaft 6j rotates with respect to the nozzle holding member 6k, the lubricant G accumulated in the vicinity area D of the inner portion and the outer portion moves toward the shaft side facing surface 68a due to the biasing force of the second biasing member 6i. and the holding-side facing surface 168a, the compressed state is alleviated by expanding the gap between the holding-side facing surface 168a and the shaft-side facing surface 68a. Therefore, it is drawn into the proximity area . Here, the levitation force is a force generated when the nozzle shaft 6j is positioned at the upper end position Up and the nozzle holding member 6k rotates together with the moving portion 69. FIG.

That is, as shown in FIG. 12, when the nozzle holding member 6k rotates in the direction R21 of the directions R2, the lubricant G held in the recess 10 is It is considered that the lubricant G becomes a high pressure due to a sudden change in flow velocity when entering the region A other than the recess 10 between the holding side facing surface 168a and the shaft side facing surface 68a. Since the lubricant moves in the direction opposite to R21 relative to the holding-side facing surface, the edge portion of the concave portion 10 in the direction opposite to the direction of R21 is elastically deformed into a tapered shape by the high-pressure lubricant G. It is thought that it will happen. Further, the inventors have found that the tapered shape makes it easier for the lubricant G to enter the region A other than the recessed portion 10 between the holding-side facing surface 168a and the shaft-side facing surface 68a. As a result, levitation force is generated by the lubricant G entering at a speed opposite to the direction of R21. In the above example, the nozzle holding member 6k rotates in the direction R21 of the circumferential direction R, but the nozzle holding member 6k rotates in the direction opposite to the direction R21 in the circumferential direction R. Similar levitation force also occurs when

In this way, in the area A between the holding side facing surface 168a and the shaft side facing surface 68a other than the recess 10, the holding side facing surface 168a is raised and separated from the shaft side facing surface 68a. As a result, a lubricating film M containing the lubricant G is formed. In other words, the lubricating film M is the lubrication accumulated in the vicinity area D of the inner portion and the outer portion that is drawn into the adjacent area when the gap between the holding side facing surface 168a and the shaft side facing surface 68a is widened by the levitation force. It is formed by agent G.

Here, since all of the plurality of nozzle shafts 6j are rotated synchronously by the rotation mechanism 6f, the lubricating film M is formed when the moving portion 69 of the desired nozzle shaft 6j and the nozzle holding member 6k are rotated by the rotation mechanism 6f. , are also formed between the fixed portion 68 of the nozzle shaft 6j other than the desired nozzle shaft 6j and the nozzle holding member 6k. That is, the lubricating film M is formed between the holding side facing surface 168a of the nozzle holding member 6k holding the other nozzle 6a and the shaft side facing surface 68a of the nozzle shaft 6j to which the other nozzle 6a is attached. ing.

(Component recognition camera)
The component recognition camera 7 is a camera for capturing an image of the electronic component E held (adsorbed) by the nozzle 6a prior to mounting the electronic component E on the substrate B, as shown in FIG. The component recognition camera 7 is fixed on the base 1 and configured to capture an image of the electronic component E held (adsorbed) by the nozzle 6a from below the electronic component E (Z2 direction).

(PCB recognition camera)
The board recognition camera 8 is attached to the mounting head 6, and prior to mounting the electronic component E on the board B, the FI mark (Fiducial Mark: not shown) put on the upper surface of the board B is used. It is a camera for capturing a mark. The FI mark is a mark for confirming the position of the substrate B. FIG.

(control part)
The control unit 9 is a control circuit that includes a CPU (Central Processing Unit), a storage unit, and the like, and controls the operation of the component mounting apparatus 100 . The control section 9 is electrically connected to the tape feeder 21 , the board transfer section 3 , the mounting head 6 , the component recognition camera 7 , the board recognition camera 8 , the X-axis motor 42 and the Y-axis motor 52 .

A mounting program based on the mounting process of the electronic component E to be mounted on the board B is stored in the storage unit.

(Effect of the first embodiment)
The following effects can be obtained in the first embodiment.

In the first embodiment, as described above, the holding-side facing surface 168a is intermittently arranged along the direction R2 and recessed in the direction in which the central axis C2 extends to form a plurality of recesses 10 for holding the lubricant G. do. As a result, the lubricant G escapes to the vicinity region D between the shaft-side facing surface 68a and the holding-side facing surface 168a by being sandwiched and compressed between the shaft-side facing surface 68a and the holding-side facing surface 168a. However, when the nozzle shaft 6j rotates in the R2 direction, the lubricant G held in the plurality of recesses 10 enters the area A other than the recesses 10, and the levitation force generated causes the shaft-side facing surface 68a to be held. Since the gap with the side facing surface 168a is widened, the lubricant G that has escaped due to the relaxation of the compressed state is returned to the adjacent region formed between the shaft side facing surface 68a and the holding side facing surface 168a. can be done. As a result, when the nozzle shaft 6j is rotated while the shaft-side facing surface 68a and the holding-side facing surface 168a are brought close to each other, a sufficient thickness is formed between the shaft-side facing surface 68a and the holding-side facing surface 168a. By forming the lubricating film M, the resistance between the shaft-side facing surface 68a and the holding-side facing surface 168a can be sufficiently reduced. In addition, since the lubricant film M having a sufficient thickness is formed between the shaft-side facing surface 68a and the holding-side facing surface 168a, contact between the shaft-side facing surface 68a and the holding-side facing surface 168a can be suppressed. Therefore, the amount of dust generated by contact between the shaft-side facing surface 68a and the holding-side facing surface 168a can be reduced. In addition, since the lubricant film M having a sufficient thickness is formed between the shaft-side facing surface 68a and the holding-side facing surface 168a, wear of each of the shaft-side facing surface 68a and the holding-side facing surface 168a is reduced. Therefore, it is possible to suppress an increase in the surface roughness of the shaft-side facing surface 68a and the holding-side facing surface 168a. As a result, when the nozzle shaft 6j is rotated while the shaft-side facing surface 68a and the holding-side facing surface 168a are brought close to each other, it is possible to suppress the vibration of the nozzle shaft 6j. It is possible to suppress deterioration in mounting quality due to components dropping from the nozzle 6a.

Further, in the first embodiment, as described above, when the nozzle shaft 6j rotates the concave portion 10 relative to the nozzle holding member 6k, the floating force causes the holding side facing surface 168a to become the shaft side facing surface. It is constructed so as to be relatively floated and separated from 68a. As a result, even if the lubricant G is sandwiched between the shaft-side facing surface 68a and the holding-side facing surface 168a and escapes to the vicinity region D between the shaft-side facing surface 68a and the holding-side facing surface 168a, the nozzle is The lifting force generated when the shaft 6j rotates in the R2 direction relatively floats the shaft-side facing surface 68a and the holding-side facing surface 168a, thereby separating the shaft-side facing surface 68a and the holding-side facing surface 168a. 168a can be sufficiently secured. As a result, the lubricant G that has escaped to the neighboring region D between the shaft-side facing surface 68a and the holding-side facing surface 168a can be returned to the neighboring region . When the nozzle shaft 6j is rotated with It is possible to sufficiently reduce the resistance with the holding side facing surface 168a.

Further, in the first embodiment, as described above, the concave portion 10 is moved relative to the nozzle shaft 6j with respect to the nozzle holding member 6k in a state in which the nozzle shaft 6j is positioned at the upper end position Up by the second biasing member 6i. The holding-side facing surface 168a is lifted from the shaft-side facing surface 68a provided on the fixed portion 68 and separated from the shaft-side facing surface 68a when the shaft rotates. As a result, by utilizing the movement of the moving portion 69 relative to the fixed portion 68 fixed to the housing 6h in the R2 direction and the direction in which the center axis C2 extends, the recess 10 moves the holding side facing surface 168a to the shaft side facing surface. Since it can be floated and separated from 68a, the holding side facing surface 168a can be floated with respect to the shaft side facing surface 68a with a simple structure. Further, since the lubricant film M having a sufficient thickness is formed between the shaft-side facing surface 68a and the holding-side facing surface 168a, the resistance between the shaft-side facing surface 68a and the holding-side facing surface 168a is sufficiently reduced. can be reduced to That is, even if the nozzle shaft 6j is rotated in the state of being positioned at the upper end position Up, a large resistance proportional to the force urging the nozzle shaft 6j is generated between the shaft-side facing surface 68a and the holding-side facing surface 168a. does not occur. Therefore, the biasing force of the second biasing member 6i can be increased. As a result, the movement of the moving part 69 in the direction in which the central axis C2 extends can be made faster, so that the mounting work time can be shortened.

In addition, in the first embodiment, as described above, in the area A other than the recess 10 between the holding side facing surface 168a and the shaft side facing surface 68a, the holding side facing surface 68a is provided relatively to the shaft side facing surface 68a. A lubricating film M containing the lubricant G is formed by floating the surfaces 168a and separating them. As a result, the holding-side facing surface 168a is lifted and separated from the shaft-side facing surface 68a, so that the lubrication that has escaped to the neighboring region D between the shaft-side facing surface 68a and the holding-side facing surface 168a. By filling the agent G and forming the lubricating film M, it is possible to reduce the resistance generated when the nozzle shaft 6j rotates. As a result, it is possible to reduce the heat generated by the drive source for rotating the nozzle shaft 6j, and to reduce the size of the mounting head 6 compared to the case where a ball bearing is provided to reduce the resistance. It is possible to increase the number of nozzle shafts 6j rotatable by the same drive source and speed up the rotation of the nozzle shafts 6j by the same drive source.

Further, in the first embodiment, as described above, the lubricating film M is applied to the holding side facing surface 168a of the nozzle holding member 6k holding the other nozzle 6a and the nozzle shaft 6j to which the other nozzle 6a is mounted. It is formed between the shaft-side facing surface 68a. As a result, the resistance generated when the nozzle shaft 6j rotates in nozzles 6a other than the desired nozzle 6a can be reduced, so the load on the rotation mechanism 6f can be reduced.

Further, in the first embodiment, as described above, the recess 10 formed in the holding side facing surface 168a is formed in a shape symmetrical with respect to the center line C3 extending along the direction in which the center axis C2 extends. As a result, the same levitation force can be generated in any direction of rotation of the nozzle shaft 6j, so that the resistance between the shaft-side facing surface 68a and the holding-side facing surface 168a can be stably and sufficiently reduced. be able to.

Further, in the first embodiment, as described above, when the plurality of grooves 11 are viewed from the direction in which the central axis C2 extends, each of the plurality of grooves 11 extends in the radial direction orthogonal to the direction in which the central axis C2 extends. arranged radially by As a result, the plurality of grooves 11 are formed at intervals in the R2 direction and also extend in the radial direction, so that the grooves 11 are arranged over the entire surface, so that unevenness in the levitation force can be suppressed. .

Here, in the component mounting apparatus 100 of the first embodiment, as in the first modification shown in FIG. 13 and the second modification shown in FIG. further includes

As in the first modification shown in FIG. 13, the holding-side facing surface 168a is provided with a plurality of recesses 210 intermittently arranged along the R2 direction and recessed in the Z2 direction to hold the lubricant G. there is Specifically, each of the plurality of recesses 210 may have a plurality of hemispherical portions 212 that are formed in a hemispherical shape and are circumferentially arranged in the circumferential direction R at intervals.

Further, like the second modification shown in FIG. 14, the concave portion 310 is formed in a hemispherical shape and has a plurality of hemispherical portions 312 circumferentially arranged at intervals in the R2 direction. In addition, the plurality of hemispherical portions 312 may be radially arranged at intervals in the R2 direction when viewed from the direction in which the central axis C2 extends. That is, it is preferable that the plurality of hemispherical portions 312 be arranged at approximately equal angular intervals in the R2 direction.

[Second embodiment]
Next, a component mounting apparatus 400 of a second embodiment will be described with reference to FIGS. 1, 2 and 15-17. Specifically, the component mounting apparatus 400 of the second embodiment differs from the component mounting apparatus 100 of the first embodiment in which a plurality of recesses 10 are formed in the holding-side facing surface 168a of the nozzle holding member 6k. A plurality of recesses 410 are formed in the shaft-side facing surface 468a of the nozzle shaft 6j. In addition, in 2nd Embodiment, the same code|symbol is attached|subjected regarding the structure similar to the said 1st Embodiment, and description is abbreviate|omitted.

A component mounting apparatus 400 of the second embodiment includes a base 1, a feeder placement section 2, a board transfer section 3, a support section 4, a rail section 5, a mounting head 406, a component recognition camera 7, a board A recognition camera 8 and a control unit 9 are provided.

<Multiple recesses>
As shown in FIGS. 15 and 16, the shaft-side facing surface 468a and the holding-side facing surface 168a of the second embodiment are arranged such that the nozzle shaft 6j is positioned at the upper end position Up and the shaft-side facing surface 468a and the holding-side facing surface 168a are separated from each other. By utilizing the rotation of the nozzle shaft 6j, the lubricating film M thinned by being sandwiched between and is formed into a lubricating film M larger in surface roughness than each of the shaft-side facing surface 468a and the holding-side facing surface 168a. It is configured.

Specifically, as shown in FIG. 17, the shaft-side facing surface 468a has a plurality of (12) recesses 410 intermittently arranged along the R2 direction and recessed in the Z1 direction to hold the lubricant G. is formed. Specifically, each of the plurality of recesses 410 is configured by a hemispherical portion 412 . The hemispherical portion 412 is formed in a hemispherical shape. The plurality of hemispherical portions 412 may have a plurality of hemispherical portions 412 circumferentially arranged at intervals in the circumferential direction R2. Other configurations of the second embodiment are the same as those of the first embodiment.

(Effect of Second Embodiment)
Effects of the second embodiment will be described.

In the second embodiment, as described above, the shaft-side facing surface 468a is provided with a plurality of recesses 410 intermittently arranged along the R2 direction and recessed in the direction in which the central axis C2 extends to retain the lubricant G. do. As a result, when the nozzle shaft 6j is rotated with the shaft-side facing surface 468a and the holding-side facing surface 168a close to each other, a sufficient thickness is formed between the shaft-side facing surface 468a and the holding-side facing surface 168a. By forming the lubricating film M, the resistance between the shaft-side facing surface 468a and the holding-side facing surface 168a can be sufficiently reduced.

Further, in the second embodiment, as described above, the plurality of hemispherical portions 412 are radially arranged at intervals in the radial direction perpendicular to the direction in which the central axis C2 extends when viewed from the direction in which the central axis C2 extends. may As a result, since the plurality of hemispherical portions 412 are formed circumferentially and radially in a dispersed manner, uneven lifting force can be suppressed. Other effects of the second embodiment are the same as those of the first embodiment.

Here, the component mounting apparatus 400 of the second embodiment further includes a mounting head 506 having a plurality of concave portions 510 that are not hemispherical like the modification shown in FIG.

As in the modification shown in FIG. 18 , a plurality of grooves 511 are formed as a plurality of recesses 510 in the shaft-side facing surface 568a and spaced apart in the R2 direction. The plurality of grooves 511 may be radially arranged by extending in a radial direction perpendicular to the direction in which the central axis C2 extends when viewed from the direction in which the central axis C2 extends. That is, it is preferable that the plurality of grooves 511 be arranged at approximately equal angular intervals in the R2 direction.

[Modification]
It should be noted that the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of the claims.

For example, in the above-described first embodiment, an example in which a plurality of recesses 10 for holding the lubricant G are formed in the holding-side facing surface 168a is shown, and in the above-described second embodiment, the shaft-side facing surface 68a is provided with the lubricant G Although an example of forming a plurality of recesses 10 for holding is shown, the present invention is not limited to this. In the present invention, it is sufficient that at least one of the shaft-side facing surface and the holding-side facing surface is formed with a plurality of recesses for holding the lubricant, and both the shaft-side facing surface and the holding-side facing surface hold the lubricant. A plurality of recesses may be formed.

Further, in the above-described first and second embodiments, an example in which the lubricant G is applied to the holding side facing surface 168a was shown, but the present invention is not limited to this. In the present invention, a lubricant may be applied to the shaft-side facing surface.

Further, in the first and second embodiments described above, the recess 10 has a shape symmetrical with respect to the center line C3 extending along the direction in which the center axis C2 extends. It is not limited to this. In the present invention, the recess may have a shape other than a shape that is line-symmetrical with respect to the center line extending along the direction in which the center axis extends.

In the first embodiment, each of the plurality of recesses 10 has an arc shape recessed toward the Z2 direction in the cross section along the R2 direction (circumferential direction). It is not limited to this. For example, each of the plurality of recesses may have a substantially rectangular shape or the like in a cross section along the circumferential direction.

In the first embodiment, the holding-side facing surface 168a is provided with grooves 11, which are a plurality of (six) recesses 10 intermittently arranged along the R2 direction and recessed in the Z2 direction to hold the lubricant G. Although the formed example is shown, the present invention is not limited to this. In the present invention, the number of grooves may be 1 to 5 or 7 or more. For example, in the third modification shown in FIGS. 19A to 19D, one, two, four and eight grooves 611 are formed in the holding side facing surface 168a.

Further, in the first embodiment, an example in which each of the plurality of grooves 11 penetrates the radial end of the holding-side facing surface 168a is shown, but the present invention is not limited to this. According to the present invention, in the third modification shown in FIGS. 19A to 19D, each of the plurality of grooves 611 is formed in the holding side facing surface 168a without penetrating the radial end thereof. good too.

Further, in the first embodiment, each of the plurality of recesses 10 is provided linearly along the direction orthogonal to the direction in which the central axis C2 extends, but the present invention is not limited to this. . In the present invention, as in a fourth modification shown in FIG. 20, the circumferential width of each of the plurality of grooves 711 of the holding-side facing surface 168a may be formed to increase radially outward. . As a result, a larger amount of the lubricant G in the groove 711 enters the area other than the groove 711 at the outer end of the nozzle shaft 6j where the rotation speed is relatively high, and the area where a larger amount of the lubricant G is required is retained. Since the amount of the lubricant G to be applied can be increased, the lubricant G held in the plurality of grooves 711 is spread over the entire region A other than the grooves 711 between the holding-side facing surface 168a and the shaft-side facing surface 68a. You can pass it around for sure.

Further, in the first embodiment, each of the plurality of grooves 11 is radially arranged by extending in a radial direction perpendicular to the direction in which the central axis C2 extends when viewed from the direction in which the central axis C2 extends. However, the present invention is not limited to this. In the present invention, as in a fifth modification shown in FIGS. 21A and 21B, the holding side facing surface 168a has a plurality of concave portions 810 extending along the R2 direction and connected to each other. A connection groove 813 may be formed that is recessed in the direction in which the central axis C2 extends. It is preferable that the depth D1 of the recess 810 is greater than the depth D2 of the connection groove 813 in the direction in which the center axis C2 extends. As a result, the connection grooves 813 can function as paths for the lubricant G between the recesses 810 , so that the connection grooves 813 can facilitate the distribution of the lubricant G to the plurality of recesses 810 . As a result, the lubricant G held in the plurality of recesses 810 can be made substantially uniform, so that the region A other than the recesses 10 between the holding side facing surface 168a and the shaft side facing surface 68a is substantially uniformly lubricated. It is possible to facilitate spreading of the agent G.

Also, in the first modification of the first embodiment, an example in which a plurality of (twelve) hemispherical portions 212 are formed as the concave portion 210 was shown, but the present invention is not limited to this. In the present invention, the number of hemispherical portions may be 1 to 11 or 13 or more. For example, in a sixth modification shown in FIGS. 22A to 22D, one, two, four and eight hemispherical portions 912 are formed on the holding side facing surface 168a.

In addition, in the second modification of the first embodiment, as the concave portion 310, a group of four hemispherical portions 213 arranged in a direction perpendicular to the central axis C2 is formed in the R2 direction. However, the present invention is not limited to this. In the present invention, 1 to 7 or 9 or more sets of 2, 3, or 5 or more hemispherical portions arranged in the direction orthogonal to the central axis may be formed as the recesses in the circumferential direction. For example, in the seventh modification shown in FIGS. 23A to 23D, 1, 2, 4, or 8 sets of five hemispherical portions 1012 are arranged in the holding side facing surface 168a in the circumferential direction. It is

In addition, in the seventh modification, the hemispherical portions 1012 having approximately the same size are arranged side by side in the direction perpendicular to the central axis C2, but the present invention is not limited to this. For example, as in an eighth modification shown in FIGS. 24A and 24B, the diameter of each of the plurality of hemispherical portions 1112 is formed so as to increase radially outward. good too. As a result, a larger amount of the lubricant G in the hemispherical portion 1112 tends to enter the region A other than the hemispherical portion 1112 at the outer end portion of the nozzle shaft 6j where the rotation speed is relatively high, and a larger amount of the lubricant G is required. Since the amount of the lubricant G retained in the region A can be increased as the area A becomes It can be ensured that the entire area A other than the hemispherical portion 1112 is covered. Note that the configurations shown in FIGS. 19 to 24 may be applied when a recess is provided in the shaft-side facing surface.

In addition, although the mounting head 6 (406) of the first and second embodiments is a mounting head having a plurality of nozzles 6a arranged in a circumferential manner, the present invention is not limited to this. do not have. In the present invention, the mounting head may be a mounting head having a plurality of nozzles horizontally arranged in a line at predetermined intervals.

6, 406 mounting head 6a nozzle 6b nozzle pressing member 6f rotation mechanism (rotation mechanism)
6h housing 6i second biasing member (biasing member)
6j Nozzle shaft 6k Nozzle holding member 10, 210, 310, 410, 510, 810 Recess 11, 511, 611, 711 Groove 68 Fixing part 68a, 468a Shaft side facing surface 69 Moving part 100, 400 Component mounting device 168a Holding side facing Surfaces 212, 312, 412, 912, 1012, 1112 Hemispherical portion 813 Connection groove A Region (other than recessed portion) B Board C2 Central axis E Electronic component (component)
G Lubricant M Lubricating film R2 (Circumferential) direction

Claims (12)

Equipped with a mounting head that includes a plurality of nozzles that are arranged side by side to pick up components and mount them on the board,
The mounting head is
a nozzle shaft having a moving portion that rotates and ascends and descends in a circumferential direction around the central axis of each of the plurality of nozzles; and a shaft-side facing surface perpendicular to the direction in which the central axis extends;
a nozzle holding member attached to the moving part to hold each of the plurality of nozzles and having a holding-side facing surface facing the shaft-side facing surface in the direction in which the central axis extends;
At least one of the holding-side facing surface and the shaft-side facing surface is provided with a plurality of recesses that are intermittently arranged along the circumferential direction and recessed in the direction in which the central axis extends to hold a lubricant. There is a component mounter. The recess is formed between the holding-side facing surface and the shaft-side facing surface when the holding-side facing surface of the nozzle holding member rotates together with the moving portion relative to the shaft-side facing surface. and the holding-side facing surface is relatively lifted and separated from the shaft-side facing surface by a lifting force generated by the entry of the lubricant held in the recess. , The component mounting apparatus according to claim 1. The mounting head is
a housing to which the nozzle shaft is attached;
a biasing member that biases the moving portion of the nozzle shaft in an upward direction to position the moving portion of the nozzle shaft at an upper end position;
The nozzle shaft is
a fixed portion fixed to the housing and provided with the shaft-side facing surface;
and the moving part arranged on the fixed part so as to rotate in the circumferential direction and move up and down in the direction in which the central axis extends,
In a state in which the moving portion of the nozzle shaft is positioned at the upper end position by the biasing member, the concave portion moves the nozzle together with the moving portion relatively to the shaft-side facing surface provided on the fixed portion. 3. The holding member is configured such that when the holding side facing surface of the holding member rotates, the holding side facing surface is lifted and separated from the shaft side facing surface provided on the fixed portion. The component mounting device described in . A lubricating film containing the lubricant is formed in a region other than the recess between the holding-side facing surface and the shaft-side facing surface by separating the shaft-side facing surface and the holding-side facing surface. 4. The component mounting apparatus according to claim 2 or 3, wherein The mounting head is
a nozzle pressing member for selectively moving up and down a desired nozzle among the plurality of nozzles held by the nozzle holding member via the nozzle shaft;
a rotation mechanism that rotates the desired nozzle in the circumferential direction and rotates nozzles other than the desired nozzle in the circumferential direction along with the rotation of the desired nozzle;
The lubricating film is formed between the holding-side facing surface of the nozzle holding member holding the other nozzle and the shaft-side facing surface of the nozzle shaft to which the other nozzle is attached. 5. The component mounting apparatus according to claim 4. 2. The concave portion formed in at least one of the holding-side facing surface and the shaft-side facing surface has a shape symmetrical with respect to a center line extending along the direction in which the center axis extends. 6. The component mounting apparatus according to any one of 1 to 5. The recess is formed in a hemispherical shape and has a plurality of hemispherical portions circumferentially arranged at intervals in the circumferential direction,
7. Any one of claims 1 to 6, wherein the plurality of hemispherical portions are also radially arranged at intervals in a radial direction orthogonal to the direction in which the central axis extends when viewed from the direction in which the central axis extends. The component mounting device according to the item. 8. The component mounting apparatus according to claim 7, wherein the diameter of each of said plurality of hemispherical portions is formed so as to increase toward the outer side in said radial direction. A plurality of the recesses are arranged at intervals in the circumferential direction,
The plurality of recesses have a plurality of grooves spaced apart in the circumferential direction,
Claims 1 to 6, wherein the plurality of grooves are radially arranged by extending in a radial direction perpendicular to the direction in which the central axis extends when viewed from the direction in which the central axis extends. The component mounting apparatus according to any one of Claims 1 to 3. 10. The component mounting apparatus according to claim 9, wherein the circumferential width of each of said plurality of grooves increases toward the outer side in said radial direction. At least one of the holding-side facing surface and the shaft-side facing surface has
forming a connection groove extending along the circumferential direction to connect the plurality of recesses to each other and recessed in the direction in which the central axis extends;
11. The component mounting apparatus according to any one of claims 1 to 10, wherein the depth of said recess is greater than the depth of said connection groove in the direction in which said central axis extends. a plurality of nozzles arranged side by side for picking up components and mounting them on the substrate;
a nozzle shaft having a moving portion that rotates and ascends and descends in a circumferential direction around the central axis of each of the plurality of nozzles; and a shaft-side facing surface perpendicular to the direction in which the central axis extends;
a nozzle holding member attached to the moving part to hold each of the plurality of nozzles and having a holding-side facing surface facing the shaft-side facing surface in the direction in which the central axis extends;
At least one of the holding-side facing surface and the shaft-side facing surface is provided with a plurality of recesses that are intermittently arranged along the circumferential direction and recessed in the direction in which the central axis extends to hold a lubricant. There is a mounting head.

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