JP3959287B2 - Electronic component mounting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic component mounting apparatus for mounting an electronic component on a circuit board, and more particularly to an electronic component mounting apparatus having a structure in which a nozzle unit is rotated and moved along a cam groove using a cylindrical cam.
[0002]
[Prior art]
A conventional electronic component mounting apparatus will be described with reference to FIGS. In FIG. 7, the index unit 15, the cylindrical cam 4, the plate cams 10a and 10b, the levers 11a and 11b operated by the plate cams 10a and 10b, and the levers 11a and 11b are connected to the support base 14 with the plate cams. Springs 12a and 12b that are urged to be pressed against 10a and 10b are attached, and the index unit 15 causes the rotary table 13 to rotate intermittently. At the periphery of the rotary table 13, vertical guides 2 that slide the plurality of nozzle units 1 up and down are fixed at equal intervals in the circumferential direction of the rotary table 113. Each of the plurality of nozzle units 1 has cam followers 5 and 6, and the cam followers 5 and 6 move in a cam groove 3 provided over the entire circumference of the cylindrical cam 4. The structure described with reference to FIG. 7 is the same as the structure shown in FIG. 1 of Japanese Patent Publication No. 7-58837.
[0003]
Operations of the cylindrical cam 4 and the cam followers 5 and 6 will be described. As shown in FIG. 8, the outer dimension W of the cam follower portions 5 and 6 is equal to or less than the groove width W1 of the cam groove 3 so that the cam followers 5 and 6 can smoothly rotate and move in the cam groove 3. A gap 3b may be generated between the cam followers 5 and 6 and the cam groove surface 3a of the cam groove 3. Therefore, when the cam followers 5 and 6 move in the cam groove 3, the cam followers 5 and 6 collide with the cam groove surface 3 a of the cam groove 3, and vibration due to this collision is transmitted to the nozzle unit 1. As a result, the component adsorbed on the nozzle unit 1 may be displaced or the component may be dropped, resulting in a deviation in the mounting position of the electronic component on the board or a missing item. Will occur.
[0004]
As a solution to such a problem, there is a method disclosed in Japanese Patent Laid-Open No. 9-36592. This method will be described below with reference to FIGS.
The electronic component mounting apparatus disclosed in Japanese Patent Application Laid-Open No. 9-36592 is attached to a first roller 25 that is provided in a nozzle unit 21 and travels in a cam groove 23, and is attached to the nozzle unit 21 so as to be finely movable in the vertical direction. A second roller 26 that travels in the cam groove 23 and a spring 28 that urges the first roller 25 and the second roller 26 to press the both side surfaces 23a and 23b of the cam groove 23, respectively. In the electronic component mounting apparatus disclosed in Japanese Patent Application Laid-Open No. 9-36592, the cam follower 25 and the cam follower 26 are pressed against the cam groove 23 by the spring 28, respectively, so that the cam follower 25, the cam follower 26, and the cam groove 23 The gap between the side surfaces 23a and 23b is eliminated to prevent the collision between the two.
[0005]
[Problems to be solved by the invention]
On the other hand, in recent years, with the further increase in operation speed of the electronic component mounting apparatus, even with the electronic component mounting apparatus disclosed in Japanese Patent Laid-Open No. 9-36592, the moving speed and moving acceleration of the rotary table 23 and the nozzle unit 21 are increased. The spring force 28 required to press the cam followers 25, 26 against the side surfaces 23a, 23b of the cam groove 23 has increased. As a result, with the solution disclosed in the above-mentioned Japanese Patent Laid-Open No. 9-36592, the design and assembly of the mechanism part has become very difficult and practically impossible.
[0006]
Also, in the usage situation of the electronic component mounting apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-36592, the size of the electronic components to be held is larger than the current one, and the mounting density on the board is lower than the present one. Therefore, even if a vibration occurs and the electronic component held is displaced, it often falls within the allowable range. On the other hand, today, electronic components are further miniaturized, and the mounting density is also very high. Therefore, the allowable range for the component deviation is much stricter than that of the prior art, and on the other hand, the mounting apparatus is required to operate at higher speed as described above. Such a background also exists in carrying out the present invention.
The present invention has been made to solve such a problem, and in a component mounting apparatus having a cam follower and a cam groove, high-quality component mounting is achieved without causing electronic component mounting position shifts or missing parts even at high speed operation. It is an object of the present invention to provide an electronic component mounting apparatus capable of performing the above-mentioned.
[0007]
[Means for Solving the Problems]
An electronic component mounting apparatus according to a first aspect of the present invention includes a rotating body and a component holding mounting portion, and the rotating body is cylindrical and rotated in a circumferential direction thereof, and the rotating body has a peripheral edge of the rotating body. The component holding mounting portion is provided so as to be movable up and down along an axial direction, and has a cylindrical cam formed with a cam groove. The component holding mounting portion engages with the cam groove to rotate the rotating body. Accordingly, the electronic component mounting apparatus has a cam follower portion that moves along the cam groove and moves the component holding and mounting portion up and down, and holds the electronic component and mounts it on the board in accordance with the lifting and lowering accompanying the rotation of the rotating body. Because
The cam follower part
A first roller that travels in the cam groove while contacting the first surface forming the cam groove;
A second roller that travels in the cam groove while contacting a second surface of the cam groove facing the first surface;
The second roller is supported at the second support position, and is pivotally attached to the component holding mounting portion at a second rotation center that is eccentric with respect to the second support position. A second rotation support member that arranges the rotation center of the first roller and the second support position on the same straight line in the ascending / descending direction when positioned perpendicular to the ascending / descending direction of the mounting portion ;
The second roller is disposed on the opposite side of the second rotation center with the second support position in between, and the second rotation support member is rotated about the second rotation center. And an urging member that presses against the second surface.
[0008]
The urging member can also be constituted by a spring.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An electronic component mounting apparatus according to an embodiment of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same component in each figure.
The electronic component mounting apparatus 100 includes a rotating body and a component holding mounting portion, and the rotating body is cylindrical and rotated in the circumferential direction thereof, and the periphery of the rotating body extends along the axial direction of the rotating body. The component holding / mounting portion is provided so as to be movable up and down, and has a cylindrical cam formed with a cam groove. The component holding / mounting portion engages with the cam groove and moves into the cam groove along with the rotation of the rotating body. It has a cam follower portion that moves along and moves up and down the component holding and mounting portion, and holds the electronic component and mounts it on the board in accordance with the lifting and lowering as the rotating body rotates.
[0010]
Specifically, as shown in FIG. 5, the electronic component mounting apparatus 100 includes a component transfer device 120, a component supply device 130, a substrate positioning device 140, a substrate transfer device 150, and a control device 180. .
In the present embodiment, the component supply device 130 is a so-called cassette type device that supplies electronic components 171 stored in a component storage section provided on a tape by conveying the tape, and supplies taping components. The substrate transport device 150 is a device that transports the circuit board 172 on which the electronic component 171 is mounted, and includes a transport drive source 151. The board positioning device 140 includes a drive source 141, holds the circuit board 172 carried into the electronic component mounting apparatus 100 by the board transport device 150, and moves the circuit board 172 in the X and Y directions. . As will be described below, the component transfer device 120 has a structure incapable of moving in the X and Y directions, so the substrate positioning device 140 moves the component transfer position to the component placement position on the held circuit board 172. The circuit board 172 is moved and positioned in the X and Y directions so that the electronic component 171 is mounted on the mounting device 120.
[0011]
The component transfer device 120 includes a rotation table 113 that is an example that performs the function of the rotating body, and a component holding and mounting unit 101, and the electronic component 171 supplied from the component supply device 130 is connected to the component holding and mounting unit The electronic component 171 is mounted on the component mounting position of the circuit board 172 held by the board positioning device 140. The rotary table 113 is attached to the output shaft of the index unit 115 that drives the intermittent rotary motion. A plurality of elevating guides 102 extending along the axial direction 173 of the rotating table 113 are provided at equal intervals in the circumferential direction of the rotating table 113 at the peripheral edge 113 a of the rotating table 113. The component holding / mounting portion 101 is attached. Therefore, each component holding / mounting portion 101 can be moved up and down in the axial direction 173 along the lifting guide 102. As described above, in the present embodiment, a plurality of component holding and mounting portions 101 are provided, but at least one unit may be provided.
[0012]
One end of the support table 114 of the component transfer device 120 is brought into contact with the index unit 115 for intermittently rotating the rotary table 113 in the circumferential direction, the cylindrical cam 104, the plate cam 110, and the plate cam 110. A lever 111 that is operated by the plate cam 110 and a spring 112 that urges the lever 111 to press the plate cam 110 are attached. The plate cam 110 rotates in the direction of the arrow, and the lever 111 swings accordingly. The other end of the lever 111 is engaged with the slider 119. The slider 119 can be moved up and down along a notch provided in a vertical direction as shown in FIG. 6 in a part of the cylindrical cam 104 described below, and corresponds to the component supply device 130. The component holding / mounting portion 101 is lowered so as to hold the electronic component 171 when the component holding position is positioned, and the electronic component 171 is mounted on the substrate 172 when the component holding / mounting portion 101 is positioned corresponding to the circuit board 172. Thus, the component holding / mounting portion 101 is lowered. As described above, the mechanical parts related to the cylindrical cam 104 and the slider 119 are fixed to the support base 114 and thus are not rotated in the circumferential direction.
[0013]
A cam groove 103 is formed on the entire circumference of the cylindrical cam 104, and the notch 104a is formed. As shown in the figure, the cam groove 103 is formed to be inclined with respect to the axial direction 173 and is located at the upper part of the cylindrical cam 103 corresponding to the component supply device 130 and at the lower part corresponding to the circuit board 172. To position. Each of the component holding and mounting portions 101 has a cam follower portion 160 that engages with the cam groove 103 and will be described in detail below. The cam follower portion 160 is engaged with the cam groove 103 and the cylindrical cam 104 having the cam groove 103 is fixed, so that the cam follower portion 160 moves along the cam groove 103 along with the rotation of the rotary table 113. The component holding mounting part 101 moves up and down according to the movement. Then, as described above, the electronic component 171 is held by the component holding and mounting unit 101 corresponding to the component supply device 130 by the lifting and lowering operation of the slider 119 due to the rotation of the plate cam 110 and corresponds to the circuit board 172. Thus, the electronic component 171 is mounted on the substrate 172.
[0014]
The cam follower 160 will be described in detail with reference to FIGS.
The cam follower section 160 includes a first roller 105, a second roller 106, a second rotation support member 107, and an urging member 108, and preferably includes a first roller support member 116. The first roller 105 is rotatably supported by the first roller support member 116, and the first roller support member 116 is attached to the component holding / mounting portion 101. Therefore, the first roller 105 attached to the component holding / mounting portion 101 via the first roller support member 116 moves in the cam groove 103 while being in contact with the first surface 103 a forming the cam groove 103. As described above, the cam follower unit 160 is attached to the component holding / mounting unit 101, and the first roller 105 cams the second roller 106 by the weight of the component holding / mounting unit 101 and the biasing member 108 as described later. The first surface 103a is in contact with the urging force when the groove 103 is pressed.
[0015]
The second roller 106 is a roller that forms the cam groove 103 and contacts the second surface 103b facing the first surface 103a, and rotates at a second support position O1 in the second rotation support member 107. Supported as possible. As shown in FIGS. 1 and 3, the second rotation support member 107 is a rectangular member, and is rotatably attached to the component holding mounting portion 101 at the second rotation center O2. Specifically, the second rotation center O2 is located in the vicinity of the one end 107a of the second rotation support member 107, and is eccentric from the second support position O1 of the second roller 106. The second rotation support member 107 is rotatably attached to the component holding / mounting portion 101 by a support shaft 118 provided at the second rotation center O2. Note that a key 109 is provided on the support shaft 118 so that the second rotation support member 107 does not idle with respect to the support shaft 118. With such a configuration, the second support member 107 for rotation and the second roller 106 attached to the component holding / mounting portion 101 can rotate about the second rotation center O2. The amount of eccentricity, which is the amount of displacement between the second support position O1 and the second rotation center O2, is “b”. In the present embodiment, the amount of eccentricity b is 0.75 mm as an example. Further, as shown in FIG. 3, when the second rotation support member 107 is attached to the component holding mounting portion 101 with the eccentric amount b, and the second rotation support member 107 is positioned in the horizontal state, The rotation center of the roller 106, that is, the second support position O 1 and the rotation center of the first roller 105 exist on the same straight line 117.
[0016]
Further, in the vicinity of the other end 107b of the second rotation support member 107, the second rotation support member 107 is rotated about the second rotation center O2 so that the second roller 106 is moved to the second rotation center O2. One end of the urging member 108 that presses against the surface 103b is in contact. The other end of the urging member 108 is in contact with the first roller support member 116. Therefore, the urging member 108 is attached in a compressed state between the first roller support member 116 and the second rotation support member 107, and the second rotation center O2 is formed by the elastic force as described above. The second rotating support member 107 is rotated as a center to press the second roller 106 against the second surface 103b. In the present embodiment, the urging member 108 uses a spring which is a kind of spring, but is not limited to a spring, and means for pressing the second surface 103b of the second roller 106. If it is.
[0017]
The principle that the second roller 106 is pressed against the second surface 103b by the rotation of the second rotation support member 107 by the biasing member 108 will be described with reference to FIGS.
The amount of eccentricity is b, the distance from the force point of the urging member 108 to the second rotation support member 107 to the second rotation center O2 is a, the spring force of the urging member 108 is F, and the spring force F is the second. The force with which the roller 106 is pressed against the second surface 103b is Fc. These relationships can be expressed by the following equations.
[0018]
[Expression 1]
F = b × Fc / a (1)
[0019]
Compared with the conventional method, in the conventional method, as shown in FIG. 10, a spring 28 is installed between the first roller 25 and the second roller 26, and the first force is directly applied by this spring force. The roller 25 and the second roller 26 are pressed against the cam groove 23. Therefore, the relationship between the spring force F and the force Fc that presses the cam followers 25 and 26 against the cam groove 23 can be expressed by the following equation.
[0020]
[Expression 2]
F = Fc (2)
[0021]
As is clear from the above equations (1) and (2), in the case of this embodiment, the spring force F is b / a times that of the conventional method and a> b, and is smaller than that of the conventional method. It is possible to use a force spring.
[0022]
Next, FIG. 4 shows a state where the width of the cam groove 103 is increased from W by ΔW. Due to the spring force F of the urging member 108, as shown in FIG. 4, the second rotation support member 107 rotates about the second rotation center O2 so as to incline by Δθ from the original state, and the second roller The second support position O1 106 moves upward by ΔW compared to the case of FIG. Therefore, the distance between the outer peripheral surfaces of the second roller 106 and the first roller 105 is W + ΔW. Thus, following the change in the width of the cam groove 103, the first roller 105 and the second roller 106 can always be brought into contact with and pressed against the first surface 103a and the second surface 103b of the cam groove 103. . At this time, the relationship between ΔW and Δθ can be expressed by the following equation.
[0023]
[Equation 3]
Sin Δθ = ΔW / b
[0024]
According to the electronic component mounting apparatus 100 configured as described above, in the component mounting apparatus having the cam follower and the cam groove, the first roller 105 and the biasing member 108 that generates a smaller force than conventional ones are used. The second roller 106 can be pressed against the cam groove 103. Specifically, as described above, in order to prevent the vibration in the electronic component mounting apparatus 100 that operates at a higher speed than the conventional one, the pressing force in the cam follower is specifically required to be about 200N. In order to generate the 200 N force in the conventional cam follower mechanism shown in FIG. 10, the spring 28 needs to generate the 200 N force. On the other hand, the spring force of the spring 28 in the conventional cam follower described with reference to FIG. 10 is 50 to 60 N, and the space where the spring is provided is in a state close to the limit. Therefore, it is impossible to accommodate a large spring that generates a force of 200 N with respect to the mechanism portion of the conventional cam follower, and it is difficult to assemble because of the strong spring force even if possible. On the other hand, by using the mechanism of the present embodiment, when the value of the eccentricity b is 0.75 mm and the distance a shown in FIG. It is possible to cope with the urging member 108 having 15 spring force.
Therefore, even if the pressing force to the cam groove of the cam follower is increased as compared with the conventional case, the size of the urging member is not increased as compared with the conventional case, and the mechanism of the cam follower is not compatible. Design and assembly are not difficult. Therefore, the conventional problem that vibration or the like occurs due to insufficient pressing force on the cam groove of the cam follower during high-speed operation of the component mounting apparatus does not occur in the component mounting apparatus 100 of the present embodiment. Accordingly, even during high-speed operation, mounting positions of electronic components and missing parts do not occur, and high-quality component mounting is possible. In addition, it is possible to cope with recent miniaturization of electronic parts and high-density mounting.
[0025]
In addition, since the first roller 105 and the second roller 106 do not collide with the first surface 103 a and the second surface 103 b of the cam groove 103, it is possible to achieve an effect that the life of the cam follower portion 160 is extended.
Furthermore, since the urging force of the urging member can be reduced as described above, it is possible to improve the assembly of the cam follower portion 160.
[0026]
Further, the structure of the cam follower portion 160 is not limited to the structure of the present embodiment described above. In short, if the rotation center O2 of the second rotation support member 107 and the support center O1 of the second roller 106 are eccentric, the force point of the biasing member 108 is provided on the opposite side of the rotation center O2. Good.
[0027]
In this embodiment, as described above, the second roller 106 is pressed using the second rotation support member 107. However, the present invention is not limited to this configuration, and the first roller 105 is pressed using the rotation support member like the second rotation support member 107, and the second roller 106 is counteracted by the biasing member 108. It is also possible to press with force.
[0028]
In the component mounting apparatus 100 having the above configuration, the following mounting operation is performed. The mounting operation is executed by controlling the operations of the component transfer device 120, the component supply device 130, the substrate positioning device 140, and the substrate transport device 150 by the control device 180 provided in the component mounting apparatus 100. . The operation flow in the mounting operation is the same as the mounting operation flow executed in the conventional component mounting apparatus having the cam follower and the cam groove.
That is, the circuit board 172 is carried into the component mounting apparatus 100 by the board conveying device 150, the circuit board 172 is held by the board positioning device 140, and further, the mounting position by the component holding and mounting unit 101, Positioning is performed by the board positioning device 140 so that the component placement position on the circuit board 172 matches. On the other hand, in the component transfer device 120, the component holding / mounting unit 101 holds the electronic component 171 from the component supply device 130 by, for example, suction, and holds the electronic component 171 by rotating the index unit 115. The mounting unit 101 is moved to the mounting position. At this time, in the component holding and mounting portion 101, the cam follower portion 160 engaged with the cam groove 103 moves along the cam groove 103. However, as described above, vibration or the like is generated even at high speed operation. It does not occur. Therefore, the electronic component 171 held by the component holding / mounting unit 101 is not displaced or dropped.
[0029]
The component holding / mounting unit 101 mounts the electronic component 171 held at the mounting position on the component mounting position of the circuit board 172. After mounting, the component holding / mounting unit 101 rotates and moves again to the arrangement position of the component supply device 130 by the rotation operation of the index unit 115.
The above description of the operation describes the basic part of the mounting operation. For example, the component recognition operation before component mounting, or the nozzle selection operation in the case where there are a plurality of component holding nozzles in one component holding mounting unit 101 It is also possible to add additional operations that are conventionally performed, such as.
[0030]
【The invention's effect】
As described above in detail, according to the electronic component mounting apparatus of the first aspect of the present invention, in the component mounting apparatus having the cam follower and the cam groove, the second rotation support member and the biasing member are provided, and the second rotation support is provided. The member is an urging member that generates a smaller urging force than the conventional one because the second support position for supporting the second roller and the second rotation center attached to the component holding mounting portion are eccentric. However, the second roller can always be pressed against the cam groove. Therefore, even when the electronic component mounting apparatus is operated at a high speed, the first roller and the second roller do not collide with the side surface of the cam groove when the first roller and the second roller move in the cam groove, and the occurrence of vibration due to the collision can be prevented. Therefore, it is possible to prevent the electronic components held in the component holding / mounting part from shifting or dropping, and there is no displacement of the electronic components or missing parts, improving the mounting accuracy and high quality component mounting. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a cam follower unit included in a component holding / mounting unit provided in an electronic component mounting apparatus according to an embodiment of the present invention.
FIG. 2 is a side view of a component holding and mounting portion having a cam follower portion shown in FIG.
FIG. 3 is a diagram for explaining an operation principle of a cam follower portion shown in FIG. 1;
FIG. 4 is a diagram for explaining an operation principle of a cam follower unit shown in FIG. 1;
FIG. 5 is a diagram showing an electronic component mounting apparatus according to an embodiment of the present invention, which includes a component holding / mounting portion having the cam follower portion shown in FIG. 1;
6 is a diagram showing a relationship between a slider and a cylindrical cam shown in FIG.
FIG. 7 is a view showing a conventional electronic component mounting apparatus having a cam groove and a cam follower.
FIG. 8 is a diagram illustrating a relationship between a cam follower and a cam groove of a conventional electronic component mounting apparatus.
FIG. 9 is a side view of a nozzle portion provided in the conventional electronic component mounting apparatus shown in FIG.
10 is a diagram for explaining a force acting on a cam follower provided in the conventional electronic component mounting apparatus shown in FIG. 7; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Electronic component mounting apparatus, 101 ... Component holding mounting part, 103 ... Cam groove,
103a ... first surface, 103b ... second surface, 104 ... cylindrical cam,
105 ... 1st roller, 106 ... 2nd roller, 107 ... 2nd support member for rotation,
108 ... Biasing member, 113 ... Rotary table, 113a ... Rim,
160 ... cam follower part,
171: Electronic component, 172: Circuit board, 173: Axial direction.

Claims (1)

A rotating body (113) and a component holding / mounting portion (101) are provided, and the rotating body is cylindrical and rotated in the circumferential direction thereof. And a cylindrical cam (104) in which a cam groove (103) is formed. The component holding / mounting portion engages with the cam groove and rotates. A cam follower portion (160) that moves along the cam groove along with the rotation of the body to raise and lower the component holding and mounting portion, and holds and holds the electronic component (171) according to the raising and lowering accompanying the rotation of the rotating body. An electronic component mounting apparatus for mounting on a substrate (172),
The cam follower part
A first roller (105) that travels in the cam groove while contacting the first surface (103a) forming the cam groove;
A second roller (106) that travels in the cam groove while contacting the second surface (103b) of the cam groove facing the first surface;
The second roller is supported at the second support position (O1), and is pivotable to the component holding and mounting portion at a second rotation center (O2) that is eccentric with respect to the second support position. The second rotation purpose is arranged so that the rotation center of the first roller and the second support position are arranged on the same straight line in the ascending / descending direction when being mounted and orthogonal to the ascending / descending direction of the component holding / mounting portion . A support member (107);
The second roller is disposed on the opposite side of the second rotation center with the second support position in between, and the second rotation support member is rotated about the second rotation center. A biasing member (108) that presses against the second surface;
An electronic component mounting apparatus comprising:

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