JP2003298290A - Electronic component mounter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong the lifetime of a mounting head by decreasing the r.p.m. thereof. <P>SOLUTION: While a hook 72 is hooked up to a movable side hook groove 41a corresponding to a nozzle 14 used previous time, an end face cam 46 is turned along with a nozzle holder 41 by means of a motor 45 such that a coupling member 70 comes to a home position before reaching a station of '8'. When a press rod 81A is advanced by means of a push rod 82A at that station, the hook 72 is hooked up to a fixed side hook groove 42a. A nozzle 14 being used next is then moved to the home position by turning only the nozzle holder 41 such that the nozzle 14 comes to a position shown by a black circle before reaching a station of '10'. When a press rod 81B is advanced by means of a push rod 82B at the station of '10', the hook 72 is hooked up to the movable side hook groove 41a and lowering state of the nozzle 14 is sustained. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an electronic component mounting apparatus for mounting a sucked electronic component on a printed circuit board. 2. Description of the Related Art Conventionally, as a mounting head of this kind of electronic component mounting apparatus, a mounting head described in JP-A-2000-101293 has been known. As shown in FIG. 7, the structure of the mounting head 13 having the plurality of suction nozzles 14 is as follows.
The mounting head 1 at station “10” (stop position)
The position of the suction nozzle 14 to be used at the origin position 3 (indicated by a black circle) and the position of the suction nozzle 14 to be used at the suction station “12” (indicated by a black circle)
Is shifted by 90 degrees, for example, so that the mounting head 13
After the origin position is determined, the mounting head 13 needs to be rotated by 90 degrees before the suction station due to the intermittent rotation of the rotary table 12. [0003] Accordingly, the life of the mounting head is shortened due to unnecessary heat generation of the mounting head and an increase in the number of bearing rotations due to an increase in the number of times the mounting head is rotated. Accordingly, an object of the present invention is to extend the life of the mounting head by reducing the number of rotations of the mounting head as much as possible. In order to solve the above-mentioned problems, the present invention provides a plurality of suction nozzles arranged at equal intervals in a circumferential direction of a plurality of mounting heads arranged at predetermined intervals on a rotating table which rotates intermittently. A holder supporting the nozzle holder so as to be rotatable around its axis, rotation driving means for rotating the nozzle holder around its axis, and a cam follower attached to the upper part of each of the suction nozzles. A ring-shaped end face cam having a plurality of cam followers slidably in contact with each other and projecting the suction nozzle, a ring-shaped end face cam, provided on the end face cam, the end face cam and the nozzle holder, and the end face cam and the holder A connecting member for selectively connecting the supporting member, and an electronic component mounting apparatus including switching means for performing a switching operation of the connecting member;
The end face cam and the holder support member are selectively connected by the connecting member at a predetermined stop position of the rotary table after mounting the electronic component, and the origin position of the mounting head during the subsequent intermittent rotation of the rotary table. Rotating the nozzle holder around its axis by the rotation driving means so that the position of the suction nozzle to be used next and the position of the suction nozzle to be used at the suction stop position are the same position,
The electronic component mounting device, wherein the end face cam and the nozzle holder are selectively connected by the connecting member at a predetermined stop position of the rotary table thereafter. Hereinafter, an electronic component mounting apparatus equipped with a mounting head according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of the electronic component mounting apparatus, and FIG. 2 is a plan view thereof. As shown in FIGS. 1 and 2, the electronic component mounting apparatus 1 includes a supply system 3 for supplying an electronic component A and a mounting system 4 for mounting the electronic component A on a printed circuit board B in parallel with each other with the apparatus main body 2 interposed therebetween. And are arranged. The apparatus main body 2 includes an index unit 11 serving as a main body of a drive system, a rotary table 12 connected to the index unit 11, and a plurality (twelve) of mounting heads 13 mounted on an outer peripheral portion of the rotary table 12. Is provided,
The rotary table 12 is intermittently rotated by the index unit 11 at an intermittent pitch corresponding to the number of the mounting heads 13. When the rotary table 12 rotates intermittently, the selected suction nozzle 14 mounted on each mounting head 13 faces the supply system 3 and the mounting system 4 as appropriate, and after sucking the electronic component A supplied from the supply system 3, It is rotated and transported to the mounting system 4 and mounted on the substrate B introduced into the mounting system 4. The supply system 3 has a number of tape cassettes (component supply units) 21 corresponding to the type of the electronic component A mounted on the substrate B. The tape cassette 21 is slidable on a pair of guide rails 22, 22. Guide 23
, And are detachably mounted side by side. Supply stand 2
3, a ball screw 24 is screwed in the sliding direction. The supply table 23 is moved forward and backward by a forward / reverse rotation of a feed motor 25 connected to one end of the ball screw 24, and the suction position of the mounting head 13 is adjusted. , A desired tape cassette 21 is selectively exposed. In each tape cassette 21, a carrier tape C loaded with electronic components A at a predetermined pitch is mounted in a state of being unwound on a tape reel 26, and the electronic component A is unwound from the tape reel 26. At any time, it is sucked out of the carrier tape C by the suction nozzle 14 and taken out. The mounting system 4 includes an XY table 31 for moving the mounted substrate B in the X-axis direction and the Y-axis direction,
The transfer path 32 and the transfer path 33 disposed before and after the Y table 31 and the substrate B on the transfer path 32 are transferred to the XY table 31, and the substrate B on the XY table 31 is transferred to the transfer path 33 at the same time. And a substrate transfer device 34. The apparatus main body 2 has an index unit 11 serving as a main component of a drive system on a support base 15. The index unit 11 rotates the rotary table 12 intermittently and synchronizes with the intermittent cycle of the rotary table 12. (Interlock), and various devices of the device main body 2 are operated. The rotary table 12 is fixed to a vertical shaft 16 hanging from the index unit 11, and rotates intermittently clockwise in a plan view. On the outer periphery of the turntable 12,
Twelve mounting heads 13 are mounted via a bracket 17 at equal intervals in the circumferential direction so as to be vertically movable. In this case, the intermittent rotation of the rotary table 12 is caused by the mounting head 1
In accordance with the number 3, each rotation has a 12 intermittent cycle for one rotation, and each mounting head 13 revolves by this intermittent rotation.
Stops at 12 stop positions (stations). The electronic components A are located at the twelve stop positions.
In addition to the suction position for mounting and the mounting position for mounting, a position for performing imaging and position correction of the sucked electronic component A, a position for performing nozzle switching (replacement) in the mounting head 13, and the like are included. As shown in FIG. 3, each mounting head 13 has a nozzle holder 41 in which five suction nozzles 14 arranged at equal intervals in the circumferential direction are respectively mounted so as to be able to protrude and retract, and the nozzle holder 41 is rotatably supported. And a holder support member 42 attached to the bracket 17 of the apparatus main body 2 side;
A passage member 43 attached to the upper surface of the nozzle holder 41 and having a vacuum passage 44 formed in the axis thereof. Between the nozzle holder 41 and the holder support member 42, a motor in which the nozzle holder 41 is on the rotor side and the holder support member 42 is on the stator side (rotation driving means: stepping motor)
45, and by driving the motor 45,
The nozzle holder 41 rotates with respect to the holder support member 42. That is, the plurality of suction nozzles 14 revolve around the axis of the nozzle holder 41. Above the holder support member 42, there is provided an end cam 46 for making the suction nozzle 14 protrude and retract. An upper bearing 47 is provided between the end cam 46 and the nozzle holder 41.
However, a lower bearing 48 is disposed between the holder support member 42 and the nozzle holder 41, respectively. That is, the nozzle holder 41 is rotatably supported by the holder support member 42 on the fixed side, and the end face cam 46 is rotatably supported by the nozzle holder 41. Also,
The end surface cam 46 is formed in a ring shape as shown in FIG. 4, and a cam surface 49 is formed on the upper end surface. Cam surface 4
A protruding cam surface 49a for lowering and protruding any one of the suction nozzles 14 is formed in a part of the suction nozzle 9. On the other hand, the upper part of each suction nozzle 14 is guided by a nozzle guide hole 51 formed in the passage member 43, and the lower part is guided by a roller guide 52 provided in the nozzle holder 41, so that the suction nozzle 14 can move up and down (can move in and out). Is configured. A suction hole 53 is formed in the lower part of the suction nozzle 14 at the axis thereof, and the upper end of the suction hole 53 is connected to the vacuum chamber section 5 of the nozzle holder 41 connected to the vacuum passage 44 of the passage member 43.
It communicates with 4. Further, a support block 55 is screwed to the middle upper portion of the suction nozzle 14, and a roller follower 56 which is in contact with the end face cam 46 is rotatably supported by the support block 55. Further, the passage member 43 and the support block 5 are wound around the suction nozzle 14 so as to be wound therearound.
5, a compression spring 57 is interposed. The suction nozzle 14 is urged in the protruding direction by the compression spring 57, and the roller follower 56 comes into rolling contact with the end face cam 46. The roller follower 56 is connected to the end face cam 4.
6, the suction nozzle 14 is in a protruding state by the spring force of the compression spring 57, and in a state in which the suction nozzle 14 is in rolling contact with a portion other than the protruding cam surface 49a, the suction nozzle 14 , Into a immersion state against the compression spring 57. In the mounting head 13 thus configured, the end cam 46, the nozzle holder 41, and the end cam 46 are provided on the lower surface of the end cam 46, more specifically, on the lower surface of the protruding cam surface 49a. And holder support member 42
(See FIG. 4), and a switching mechanism 80 for switching the connecting member 70 is provided on the holder supporting member 42. FIG.
As shown in FIG. 7, the connecting member 70 includes a member main body 71, a hook 72 fixed to the lower surface of the member main body 71, and a member main body 71.
And a support pin 73 for rotatably supporting the lower surface of the end face cam 46. The member main body 71 is formed to be bent in a rectangular shape in plan view on the side of the nozzle holder 41 around the support pin 73, and a pair of abutting abutment at both outer ends thereof with the switching mechanism 80. Protrusions 74, 74 are formed. An engagement portion 75 that engages with a click mechanism 90 described later and is connected to the contact protrusion 74 is formed at one outer end. A hook 72 is fixed to the lower surface of the member main body 71 near the engaging portion 75. With the rotation of the member body 71,
One end of the hook 72 is connected to the fixed hook groove 42 a of the holder support member 42, and the other end is
One of the two movable side hook grooves 41a is selectively locked. The five movable hook grooves 41a are formed at predetermined intervals corresponding to the five suction nozzles 14. The click mechanism 90 is attached to the lower surface of the end cam 46 similarly to the connecting member 70, and a roller holder 91 rotatably supported on the lower surface of the end cam 46, and rotatably supported by the roller holder 91. Click roller 9
2 and a spring 93 for urging the click roller 92 toward the connecting member 70 via the roller holder 91. The click roller 92 is in contact with the engaging portion 75 of the connecting member 70 in a state where the click roller 92 is urged by the spring 93, and engages with the turning of the connecting member 70 in a click manner.
The state where the hook 72 is locked in the fixed hook groove 42a or the movable hook groove 41a is maintained. On the other hand, the switching mechanism 80 includes a pair of pressing rods 81, 81 for pressing the pair of abutting projections 74, 74 of the connecting member 70, respectively, and a device body 2 side for pressing the pair of pressing rods 81, 81, respectively. A pair of push rods 8
2, 82, and a pair of push rods 82,
82 is connected to a driving device (described later) 83 for selectively reciprocating these components. Each pressing rod 81 is supported by a guide hole 42b formed in the holder supporting member 42 so as to be able to advance and retreat, and is urged in a retreating direction by a coil spring 84 wound around the pressing rod 81. The switching mechanism (and its driving device) may be constituted by a solenoid or the like and mounted on the mounting head (holder support member). The upper push rod 82 shown in FIG.
When the upper pressing rod 81 moves forward by B, one (upper) contact projection 74 is pressed, the connecting member 70 rotates counterclockwise in the drawing, and the hook 72 is locked in the movable hook groove 41a. Conversely, when the lower push rod 81A advances the lower push rod 81A, the other (lower) contact projection 74 is pushed, and the connecting member 70 rotates clockwise in the figure to fix the hook 72. It is locked in the side hook groove 42a. When the hook 72 of the connecting member 70 is locked in the fixed hook groove 42a, only the nozzle holder 41 rotates forward and reverse with the end face cam 46 held by the holder supporting member 42, and conversely. Hook 72 is movable hook groove 41
a, the end cam 46 and the nozzle holder 41 integrally rotate forward and backward. On the other hand, as shown in FIG.
The rotation angle of the end cam 46, specifically, the end cam 4
A cam encoder (cam position detecting means) 61 for detecting the rotational position of the 6 projecting cam surface 49a is provided. The cam encoder 61 is connected to a CPU (control means) 62, and the CPU 62 has a motor driver (control means) 63.
Via the motor 45 and the driving device 83
Is connected. Originally, the protruding cam surface 49a is at the protruding position that is the home position of the mounting head 13, but by the rotation correction (correction in the θ direction) of the sucked electronic component A,
It may be at a position shifted from the projecting position. For this reason,
The cam encoder 61 detects the angle of deviation of the protruding cam surface 49a from the protruding position, and drives the motor 45 via the motor driver 63 to correct this deviation. Similarly, the rotation angle of each suction nozzle 14, specifically, each suction nozzle 1 is attached to the mounting head 13.
A nozzle encoder (nozzle position detecting means) 64 for detecting which rotational position of the nozzle 4 is located is provided. The nozzle encoder 64 is also connected to the CPU 62. In order to rotate the desired suction nozzle 14 to a desired position, the motor 45 is driven based on the detection result of the nozzle encoder 64 and the predetermined number of steps and the nozzle holder 41 are performed.
Is rotated (forward / reverse rotation). In FIG. 5A, the pair of push rods 82A and 82B are shown side by side for the sake of convenience. However, the pair of push rods 82A and 82B are actually provided at different stop positions. . That is, the push rod 82B is provided at the station “8” in FIG. 6, and the push rod 82A is provided at the station “10”. Here, the protruding operation of one arbitrary suction nozzle 14 (replacement operation of the suction nozzle 14) will be described step by step with reference to FIG. First, the hook 72 of the connecting member 70
Is locked in the movable hook groove 41a,
At the suction station labeled "12", the suction nozzle 14 descends from the tape cassette 21 to suck and take out the electronic component A, and the rotary table 12 is rotated intermittently by the index unit 11 to recognize the "3" recognition station. The electronic component A is held by the suction nozzle 14 by the component recognition camera, and the position of the electronic component A is recognized, and the XY table 31 is moved in the mounting station "6" in consideration of the amount of displacement based on the position recognition result to correct the XY direction. And motor 4
5, the electronic component A is mounted on the printed circuit board B at a position where θ correction has been made by rotating only the nozzle holder 41 (by rotating the suction nozzle 14 to be used). The rotation of only the nozzle holder 41 is performed during the movement up to the “6” mounting station. The hook 72 of the connecting member 70 is connected to one of the movable side hook grooves (the suction nozzle 14 used last time).
And the motor 45 so that the connecting member 70 comes to the home position (the position of the switching mechanism 80) before reaching the station "8" in this state. As a result, the end face cam 46 is rotated together with the nozzle holder 41. Of course, the cam encoder 61
Is rotated to the smaller one of the forward and reverse rotation angles based on the detection result. When the connecting member 70 moves to the home position in this way, the protruding cam surface 49a of the end face cam 46 moves to the suction position, and the home position becomes the protruding position at which the suction nozzle 14 protrudes. Next, at station "8", when the switching mechanism 80, specifically, the push rod 81A advances the push rod 81A, the contact projection 74a is pushed, and the connecting member 70 is rotated clockwise in the figure. As a result, the hook 72 is locked in the fixed hook groove 42a. Then, the suction nozzle 14 to be used next is
By rotating only the nozzle holder 41 by the motor 45 so as to reach the position indicated by the black circle before reaching the station "10", the suction nozzle 14 to be used next is moved to the home position. When the suction nozzle 14 to be used moves to the position of the protruding cam surface 49a, the suction nozzle 14 descends due to the cam action of the protruding cam surface 49a, and the tip end protrudes from the lower end surface of the nozzle holder 41. At the station "10", when the pushing rod 81B is advanced by the push rod 82B, the connecting member 70 is rotated counterclockwise in the figure to switch the hook 72 of the connecting member 70 again, and the movable hook groove is moved. Then, the suction nozzle 14 to be used next is maintained in the lowered state. Therefore, without rotating the motor 45 in this state, when the rotary table 12 is rotated intermittently by the index unit 11 and reaches the suction station "12", the suction nozzle 14 to be used is used.
Is a position indicated by a black circle which is a suction position. Although the embodiments of the present invention have been described above, various alternatives, modifications or variations are possible for those skilled in the art based on the above description, and the present invention is not limited to the above various embodiments without departing from the spirit thereof. It is intended to cover alternatives, modifications or variations. As described above, according to the present invention, the life of the mounting head can be extended by minimizing the rotation speed of the mounting head.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of an electronic component mounting device. FIG. 2 is a plan view of the electronic component mounting apparatus. FIG. 3 is a cut side view of the mounting head. FIG. 4 is a perspective view around an end cam of the mounting head. FIG. 5 is a structural diagram around a connecting member of the mounting head. FIG. 6 is a schematic plan view showing an intermittent stop position on the rotary table. FIG. 7 is a schematic plan view showing an intermittent stop position in a conventional rotary table. [Description of Signs] 1 Electronic component mounting device 2 Mounting main body 13 Mounting head 14 Suction nozzle 41 Nozzle holder 42 Holder support member 45 Motor 46 End cam 49a Projecting cam surface 56 Roller follower 61 Encoder for cam 62 CPU 64 Encoder for nozzle 70 Connection Member 80 Switching mechanism 83 Driving device

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Katsunao Usui             2-5-5 Keihanhondori, Moriguchi-shi, Osaka 3             Yo Electric Co., Ltd. F term (reference) 5E313 CC03 CD06 EE01 EE02 EE24                       EE25

Claims (1)

Claims 1. A nozzle holder in which a plurality of suction nozzles are arranged at equal intervals in a circumferential direction of a plurality of mounting heads arranged at predetermined intervals on a rotating table that rotates intermittently. A holder support member that rotatably supports the nozzle holder around its axis, a rotation driving unit that rotates the nozzle holder around its axis, a cam follower attached to the upper part of each suction nozzle, and a plurality of cam followers. A ring-shaped end face cam having a protruding cam surface that slides out and protrudes the suction nozzle, and is provided on the end face cam, and selectively connects the end face cam and the nozzle holder, and the end face cam and the holder support member. In an electronic component mounting apparatus comprising: a connecting member to be connected; and switching means for performing a switching operation of the connecting member, the rotary table after mounting the electronic component. At the predetermined stop position, the end face cam and the holder support member are selectively connected by the connection member, and during the intermittent rotation of the rotary table thereafter, the suction nozzle of the next use at the origin position of the mounting head is set. The nozzle holder is rotated around its axis by the rotation driving means so that the position and the position of the suction nozzle to be used at the suction stop position are the same position, and then the connection is performed at a predetermined stop position of the rotary table. An electronic component mounting device, wherein the end face cam and the nozzle holder are selectively connected by a member.