JP2004006972A - Mounting head of electronic part mounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting head of an electronic part mounting device, which is capable of extending a lifetime of suction nozzles without causing a problem in a switching operation of the suction nozzles. <P>SOLUTION: The mounting head of the electronic part mounting device, which allows any one of a plurality of suction nozzles 14 to be protruded from a bottom end surface of a nozzle holder 41 at a protrusion position, comprises: cam followers 56 attached above each suction nozzle 14 that is installed to a nozzle holder 41 in a freely appearing manner; compression springs that biases the suction nozzles 14 into a protrusion direction; and a ring-shaped end surface cam 48 where a cam surface, on which a plurality of the cam followers 56 contact in a sliding manner, is formed on a top end surface, and which has a concave protrusion cam surface 49a that allows the suction nozzle 14 to be protruded by the compression spring 57, and where contact in a sliding manner between the cam surface other than the protrusion cam surface and the cam follower 56 makes the suction nozzle 14 plunge resisting the compression spring 57. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a mounting head of an electronic component mounting device for mounting a sucked electronic component on a substrate or the like.

Conventionally, a mounting head of an electronic component mounting apparatus of this type has a nozzle holder rotatably mounted with a plurality of suction nozzles and a nozzle holder rotatably supported via a pair of upper and lower bearings. A holder support member attached to the bracket. A claw support member is provided upright on the upper portion of the nozzle holder, and a plurality of hook claws are vertically rotatably provided on the claw support member so as to correspond to the plurality of suction nozzles. An engagement groove is formed on the upper end surface of the claw support member, and the output end of the rotation drive mechanism on the apparatus main body side is engaged with the engagement groove. That is, the output end of the rotation drive mechanism is engaged with the engagement groove to rotate the nozzle holder, so that any one of the suction nozzles to be used faces the protruding position.

On the other hand, on the upper part of each suction nozzle, a claw receiving member that engages with the above-mentioned hook claw is fixed. In this case, each suction nozzle is immersed in the nozzle holder by lowering the entire mounting head and abutting the nozzle head on the nozzle abutment. This is performed by rotating the latching pawl by the latch release mechanism to release the latch with the pawl receiving member. That is, by rotating the nozzle holder so that one suction nozzle to be used faces the protruding position, all the suction nozzles are temporarily immersed by the nozzle contact table, and only the one suction nozzle to be used next is protruded. Thus, the suction nozzle is switched (replaced).
JP-A-5-226888

However, in the above-described mounting head, all the suction nozzles are brought into contact with the nozzle abutment with the operation of protruding one suction nozzle to be used. For this reason, there is a problem that the tip of the suction nozzle is worn or deformed due to repetition of the abutting operation, and the life of the suction nozzle is shortened.

An object of the present invention is to provide a mounting head of an electronic component mounting apparatus which can prolong the life of a suction nozzle without hindering a switching operation of the suction nozzle.

Therefore, a first aspect of the present invention provides a nozzle holder in which a plurality of suction nozzles are arranged in a circumferential direction, and a nozzle holder in which each of the suction nozzles is mounted so as to be able to protrude and retract, and a holder support member which supports the nozzle holder rotatably around its axis. And rotation driving means for rotating the nozzle holder forward and backward about its axis. The rotation driving means rotates the nozzle holder so that any one of the suction nozzles to be used faces the protruding position, and protrudes the suction nozzle. In a mounting head of an electronic component mounting device that protrudes from a lower end surface of the nozzle holder at a position, a cam follower mounted on an upper part of each suction nozzle, a compression spring for urging the suction nozzle in a protruding direction, and a plurality of the cam followers are provided. A cam surface which is slidably contacted is formed on an upper end surface and has a concave cam surface which makes the suction nozzle protrude by a compression spring. And a ring-shaped end face cam by the sliding contact with the outer cam surface and the cam follower is retracted the suction nozzle against the compression spring, characterized by comprising.

According to the mounting head of the electronic component mounting apparatus of the first invention, the cam action and compression by sliding contact between the cam follower and the protruding cam surface of the end cam whose cam surface is formed on the upper end surface and cam surfaces other than the protruding cam surface. The suction nozzle is made to protrude and retract by the bias of the spring, and in particular, the suction nozzle is retracted against the compression spring by sliding contact between the cam follower and a cam surface other than the protruding cam surface of the end cam. It is not necessary to raise the suction nozzle relatively, so that the suction nozzle that is not used can be immersed securely, and only the suction nozzle that is used can be protruded to the protruding position. No deformation or deformation. Therefore, the life of the suction nozzle can be extended without hindering the switching operation of the suction nozzle, and the reliability of component suction can be improved.

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 board B in parallel with each other with the apparatus main body 2 interposed therebetween. Is arranged. The apparatus main body 2 is provided with 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 of (12) mounting heads 13 mounted on an outer peripheral portion of the rotary table 12. 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 suction nozzles 14 mounted on each mounting head 13 face the supply system 3 and the mounting system 4 as appropriate, suck the electronic component A supplied from the supply system 3, and then rotate to the mounting system 4. This is mounted on the substrate B transported and introduced into the mounting system 4.

The supply system 3 has a number of tape cassettes 21 corresponding to the types of electronic components A mounted on the substrate B. The tape cassettes 21 are provided on a supply table 23 slidably guided by a pair of guide rails 22, 22. , Mounted side by side and detachably. A ball screw 24 is screwed into the supply table 23 in the sliding direction, and 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, so that the mounting head 13 A desired tape cassette 21 is selectively brought to the suction position. 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. The electronic components A are unwound from the tape reel 26. The suction nozzle 14 sucks the carrier tape C from time to time.

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, a carry-in conveyance path 32 and a carry-out conveyance path 33 disposed before and after the XY table 31, and a carry-in conveyance path 32. The upper substrate B is constituted by an XY table 31 and a substrate transfer device 34 for simultaneously transferring the substrate B on the XY table 31 to an unloading conveyance path 33. The substrate B sent to the downstream end of the carry-in transport path 32 is transferred onto the XY table 31 by the substrate transfer device 34, and at the same time, the substrate B on the XY table 31 on which the mounting of the electronic component A is completed is The transfer device 34 transfers the sheet to the unloading conveyance path 33. The board B introduced on the XY table 31 is appropriately moved by the XY table 31, and corresponding to the electronic components A sent one after another by the respective mounting heads 13, the component mounting part faces the mounting position. The electronic component A is received from each suction nozzle 14.

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 (interlocks) with the intermittent cycle of the rotary table 12. Then, 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. Twelve mounting heads 13 are attached to the outer peripheral portion of the turntable 12 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 has a 12 intermittent cycle for one rotation in accordance with the number of the mounting heads 13, and the mounting heads 13 revolving by the intermittent rotation move to 12 stop positions. Stop each. The twelve stop positions include a suction position at which the electronic component A is sucked and a mounting position at which the electronic component A is mounted, a position at which imaging and position correction of the sucked electronic component A are performed, and nozzle switching (replacement) at the mounting head 13. And the like.

As shown in FIG. 3, each mounting head 13 rotates a nozzle holder 41 in which a plurality of (about five) suction nozzles 14 arranged at equal intervals in the circumferential direction are respectively mounted so as to be able to come and go, and a nozzle holder 41. A holder support member 42, which is freely supported and attached to the bracket 17 on the apparatus main body 2 side, and 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 (rotation driving means: stepping motor) 45 is provided, in which the nozzle holder 41 is on the rotor side and the holder support member 42 is on the stator side. , 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.

上 In addition, an upper bearing 46 and a lower bearing 47 are vertically provided between the nozzle holder 41 and the holder support member 42. The upper bearing 46 includes an upper inner bearing (forward rotation clutch) 46a located on the nozzle holder 41 side and an upper outer bearing (reverse rotation clutch) 46b located on the holder support member 42 side. Between the upper bearing 46a and the outer bearing 46b, a lower portion of an end cam 48 for allowing the suction nozzle 14 to protrude and retract is provided. The upper inner bearing 46a and the upper outer bearing 46b are special roller bearings, and a large number of rollers are disposed in a tapered shape as a whole with a twist angle. For this reason, when rotating in the direction of the torsion angle, it does not bite into the member that supports it and does not rotate, but allows rotation only when rotated in the direction opposite to the torsion angle. That is, the upper inner bearing 46a and the upper outer bearing 46b constitute a so-called one-way clutch.

In this case, the upper inner bearing 46a interposed between the nozzle holder 41 and the end face cam 48 allows only the forward rotation of the nozzle holder 41 clockwise as viewed from below, and the holder support member 42 and the end face cam. The upper outer bearing 46b interposed between the upper and lower nozzles 48 allows only the reverse rotation of the nozzle holder 41 which is counterclockwise viewed from below. Therefore, when the nozzle holder 41 rotates forward by the motor (motor structure) 45, only the nozzle holder 41 rotates (forward rotation) while the end face cam 48 is held by the holder support member 42, and conversely. When the nozzle holder 41 rotates in the reverse direction, the end face cam 48 and the nozzle holder 41 rotate (reversely rotate) integrally.

お よ び As shown in FIGS. 3 and 4, the end face cam 48 is formed in a ring shape, and a cam face 49 is formed on the upper end face. A projecting cam surface 49a is formed on a part of the cam surface 49 so as to lower the suction nozzle 14 to project. A lower portion of the end cam 48 is supported so as to be sandwiched between the upper inner bearing 46a and the upper outer bearing 46b, and is formed in a slightly tapered shape so as to appropriately contact the upper bearings 46a. I have.

On the other hand, each of the suction nozzles 14 is configured to be vertically movable (freely protruding and retracting) with its upper part being guided by a guide hole 51 formed in the passage member 43 and its lower part being guided by a roller guide 52 provided in the nozzle holder 41. I have. A suction hole 53 is formed in the lower part of the suction nozzle 14 at the axis thereof. The upper end of the suction hole 53 communicates with a vacuum chamber 54 of the nozzle holder 41 connected to the vacuum passage 44 of the passage member 43. I have. A support block 55 is screwed to the middle upper portion of the suction nozzle 14, and a roller follower 56 that is in contact with the end cam 48 is rotatably supported by the support block 55.

A compression spring 57 is provided above the suction nozzle 14 between the passage member 43 and the support block 55 so as to be wound therearound. The suction nozzle 14 is urged in the protruding direction by the compression spring 57, and the roller follower 56 is securely rolled into contact with the end face cam 48. When the roller follower 56 is in rolling contact with the protruding cam surface 49a of the end face cam 48, the suction nozzle 14 is in a protruding state by the spring force of the compression spring 57, and is in rolling contact with a portion other than the protruding cam surface 49a. In the state where the suction nozzle 14 is in the suction state, the suction nozzle 14 is in a state of being immersed against the compression spring 57.

On the other hand, as shown in FIG. 3, the mounting head 13 has a cam encoder (cam position detecting means) 61 for detecting the rotation angle of the end cam 48, specifically, the rotation position of the protruding cam surface 49a of the end cam 48. Is provided. The cam encoder 61 is connected to a CPU (control means) 62, and the motor 45 is connected to the CPU 62 via a motor driver (control means) 63. Originally, the projecting cam surface 49a is located at a projecting position that is an absolute position of the mounting head 13, but may be at a position shifted from the projecting position due to rotation correction (correction in the θ direction) of the sucked electronic component A. is there. Therefore, the cam encoder 61 detects the deviation angle of the protruding cam surface 49a from the protruding position, drives the motor 45 via a motor driver (reverse rotation), and corrects this deviation.

Similarly, the mounting head 13 is provided with a nozzle encoder (nozzle position detecting means) 64 for detecting the rotation angle of each suction nozzle 14, specifically, which rotation position each suction nozzle 14 is at. I have. The nozzle encoder 64 is also connected to the CPU 62. 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 nozzle holder 41 is rotated (forward rotation) by a predetermined number of steps.

Here, the protruding operation of one arbitrary suction nozzle 14 (replacement operation of the suction nozzle 14) will be described step by step. First, the nozzle holder 41 is reversed by the motor 45. When the nozzle holder 41 is rotated in the reverse direction, the end face cam 48 is also integrally rotated in the reverse direction. At this time, the motor 45 is rotated by the number of steps based on the detection result of the cam encoder 61 so that the protruding cam surface 49a of the end cam 48 comes to the protruding position. As a result, first, the projecting cam surface 49a of the end face cam 48 moves to the projecting position.

Next, the motor 45 is rotated forward for a predetermined number of steps based on the detection result of the nozzle encoder 64. Thereby, the suction nozzle 14 used by the normal rotation of the nozzle holder 41 moves to the position of the protruding cam surface 49a, that is, the protruding 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.

As described above, according to the present embodiment, by rotating the nozzle holder 41 forward and backward, the end face cam 48 and the nozzle holder 41 can be selectively rotated, and the cam action of the end face cam 48 and the roller follower 56 can be achieved. Accordingly, a desired suction nozzle 14 can be protruded to a desired protruding position. That is, the suction nozzle 14 used at an appropriate position can be accurately projected by a single rotary drive source. In this case, since the cam function is used, there is no need to relatively push up the tip of the suction nozzle 14, and the push-up operation does not shorten the life of the suction nozzle 14, unlike the related art.

The cam follower is not limited to the rolling contact type roller follower of the embodiment, but may be a normal sliding contact type cam follower.

FIG. 1 is a side view of an electronic component mounting apparatus equipped with a mounting head according to an embodiment of the present invention. FIG. 1 is a plan view of an electronic component mounting device on which a mounting head according to an embodiment is mounted. It is a cutting | disconnection side view of the mounting head of embodiment. FIG. 3 is a perspective view around an end face cam of the mounting head according to the embodiment.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2 Mounting main body 13 Mounting head 14 Suction nozzle 41 Nozzle holder 42 Holder support member 45 Motor 46 Upper bearing 46a Upper inner bearing 46b Upper outer bearing 48 End surface cam 49 Cam surface 49a Projecting cam surface 56 Roller follower 61 For cam Encoder 62 CPU
64 nozzle encoder

Claims (1)

A nozzle holder in which a plurality of suction nozzles are arranged in the circumferential direction, and each of the suction nozzles is mounted so as to be able to protrude and retract,
A holder support member that rotatably supports the nozzle holder around its axis,
Rotation driving means for rotating the nozzle holder forward and backward about its axis,
An electronic component mounting unit that rotates the nozzle holder so that any one of the suction nozzles to be used faces the protruding position by the rotation driving unit and causes the suction nozzle to protrude from the lower end surface of the nozzle holder at the protruding position; In the mounting head of the device,
A cam follower attached to the top of each suction nozzle,
A compression spring for urging the suction nozzle in a protruding direction;
A cam surface with which the plurality of cam followers are in sliding contact is formed on an upper end surface, and has a concave protruding cam surface for protruding the suction nozzle by the compression spring. The cam surface other than the protruding cam surface slides with the cam follower. A mounting head for an electronic component mounting device, comprising: a ring-shaped end surface cam for causing the suction nozzle to be immersed against the compression spring by contact.

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