JP2002158494A - Electronic part mounter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount a part at high speed by elevating a mount head at a small acceleration of assigned long timing for normal operation and at a large acceleration of assigned short timing when interfering with adjacent electronic parts. SOLUTION: A cylinder 48 is operated to lead in its rod 83 so that a cam follower 43 may be press-fitted to the inner side surface 46 of a groove 45 to mount a part at a small timing of elevation acceleration of a mount head 15, and in this state, a lever 41 is energized so as to swing on a fulcrum of a supporting shaft 49 in the counterclockwise direction. A swing plate 73 is swung on a fulcrum of a supporting shaft 75 by operating a cylinder 76 and pulling in a rod 77, so that an eccentric shaft 70 is slightly rotated and a camshaft 63 is lowered. Therefore, the upper plane position of a roller rest 37 at the upper-limit position is the same as that of a cylindrical rib cam 35, and a cam follower can be smoothly transferred onto the roller rest 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary table which is intermittently rotated by driving an index unit. The present invention relates to an electronic component mounting apparatus that takes out an electronic component and mounts the electronic component on a printed circuit board using the mounting head that has been moved by rotation of the table.

[0002]

2. Description of the Related Art Conventionally, the timing of the cam is disclosed in Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Application Publication No. 195590, there is one type of electronic component which is mounted at a high speed, mounted at a low speed, taller or lower, and affected by adjacent electronic components. Had control.

That is, control is performed so that all electronic components can be handled by one cam, and it is necessary to uniformly move the mounting head up and down at a large acceleration, that is, at a timing with a short assignment, so that high-speed component mounting is required. Conversion was limited.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, when the mounting head is moved up and down in a normal case, a small acceleration, that is, a large acceleration when the interference with adjacent electronic components occurs at a long timing, that is, a large acceleration is performed. It is an object of the present invention to be able to operate at a short timing and to speed up component mounting.

[0005]

Means for Solving the Problems For this reason, the first invention provides
A plurality of mounting heads arranged on the periphery of the rotary table that intermittently rotate by driving the index unit move up and down with respect to the rotary table by rotating the cam at the component mounting position to take out electronic components, and move by rotating the table. In the electronic component mounting apparatus for mounting the electronic component on a printed circuit board by the mounting head, a groove is formed in the cam, and a cam follower provided on a lever for raising and lowering the mounting head is formed in a groove of the cam. It is characterized in that the ascending and descending acceleration is changed between the case of contacting the inner surface and the case of contacting the outer surface.

According to a second aspect of the present invention, a mechanism for raising and lowering a cam shaft of the cam is provided.

A third aspect of the present invention is characterized in that the camshaft is provided with an eccentric shaft which is eccentric to the camshaft, and the camshaft is moved up and down by rotating the eccentric shaft.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a Y table which moves in the Y direction by driving a Y-axis motor 2, and 3 denotes an XY table which moves in the X direction on the Y table 1 by driving an X-axis motor 4. Is an XY table that moves in the direction, and a printed circuit board 6 on which a chip-shaped electronic component 5 is mounted.
Are fixed and mounted on fixing means (not shown).

Reference numeral 7 denotes a supply table on which a number of component supply devices 8 for supplying the electronic components 5 are provided. Reference numeral 9 denotes a supply table drive motor, which rotates the ball screw 10 so that the supply table 7 is connected to the linear guide 12 via a nut (not shown) fitted with the ball screw 10 and fixed to the supply table 7.
To move in the X direction. Reference numeral 13 denotes a rotary table which rotates intermittently. At the outer edge of the table 13, mounting heads 15 having a plurality of suction nozzles 14 are arranged at equal intervals in accordance with an intermittent pitch, as described later.

The stop position of the mounting head 15 where the suction nozzle 14 sucks and picks up the component 5 from the component supply device 8 (FIG. 1)
A suction station I is located at a position in the middle and above with a black circle), and the suction nozzle 14 sucks the component 5 when the mounting head 15 is lowered at the suction station I.

Reference numeral II denotes a recognition station in which the mounting head 15 sucking the component 5 stops due to the intermittent rotation of the rotary table 13. The component recognition device 16 recognizes a positional shift of the component 5 with respect to the suction nozzle 14.

Reference numeral III denotes a mounting station at which the mounting head 15 stops to mount the component 5 sucked and held by the suction nozzle 14 on the printed circuit board 6 (a position indicated by a black circle in FIG. 1). The component 5 is mounted on the printed board 6 stopped at a predetermined position by the movement of the XY table 3 due to the lowering of the head 15 with respect to the rotary table 13.

Next, in FIG. 2, the component supply device 8 moves the electronic component 5 encapsulated in a tape (not shown) wound on a tape reel 28 to a swing lever 27 by means of a mechanism not shown. By engaging and oscillating, the feed suction nozzle 14 is supplied to the take-out position of the suction nozzle 14 one pitch at a time.

Hereinafter, the mounting head 1 will be described with reference to FIGS.
5 will be described. The mounting head 15 is the guide rail 1
The nut body 30, which is attached to the head upper and lower table 29 attached to the guide rail 7 and slidably attached to the guide rail 17, is attached to the rotary table 13. Therefore, the head 15 can move up and down with respect to the rotary table 13.

A mounting plate 31 is mounted on the upper part of the head vertical table 29, and a pair of cam followers 32 and 33 are mounted on the mounting plate 31. The pair of cam followers 32 and 33 are moved upward by a spring (not shown) so that the frame
4, a cylindrical rib cam 3 suspended and fixed below
Insert 5 The vertical position is regulated by the cam followers 32 and 33 sandwiching the cylindrical rib cam 35, and the head 15 moves by intermittent rotation of the rotary table 13.

A motor (not shown) is incorporated in the head 15, and rotates the suction nozzle 14 around a vertical axis. A plurality of nozzles 14 are provided at positions eccentric with respect to the rotation center axis in the head 15 so as to be able to enter and exit the head 15.

In FIG. 2, the cylindrical rib cam 35 is notched at the positions of the suction station I and the mounting station II, and a roller rest 37 is provided in the notch so as to be able to move up and down. Accordingly, the head 15 moves up and down while the intermittent rotation is stopped at the station, and the suction and mounting of the electronic component 5 are performed. The elevating mechanism is a similar mechanism.

The roller rest 37 is attached to a vertical rail 38, and the vertical rail 38 is moved up and down by being guided by a slide unit 39 fixed to the frame 34. It is supported by a lever 41.

The cam follower 43 fits into a groove 45 formed in the cam 44, and the inner side surface 4 that forms the groove 45.
6 or the outer surface 47 is pressed against the cam follower 43, and the rotation of the cam 44 causes the lever 41 to swing,
As a result, the vertical rail 38, that is, the mounting head 15 (the suction nozzle 14) moves up and down.

That is, the cam 44 for moving the mounting head 15 up and down is a grooved cam, and the cam follower 43 is pressed against the inner surface 46 or the outer surface 47 of the groove 45 to change the cam timing. . in this case,
Normally, the cam follower 43 is mounted on the inner surface 46 of the groove 45 so that the component mounting operation is performed at a timing such that the acceleration of the elevation of the mounting head 15 is small, that is, the allocation is long (the head starts to descend quickly and the time required for the elevation is long). As shown in FIGS. 4 and 5, the cylinder 48 is operated to retract the rod 83 so that the lever 41 connected to the rod 83 is swung counterclockwise about the support shaft 49 as a fulcrum. In the case of interfering with the electronic components already mounted on the printed circuit board at the time of mounting, the acceleration is large, that is, the assignment is short (the head starts to move down slowly and the time required to move up and down is short). In order to press the cam follower 43 against the outer surface 47 of the groove 45 so as to perform the component mounting operation, the cylinder 48 is bent as shown in FIGS. In which biases so as to swing in the clockwise direction the lever 41 in the state of being operated to shove the rod 83 as a fulcrum shaft 49.

As described above, the cylinder 48 is mounted so that the component mounting operation is performed at either a small timing or a large timing when the acceleration of the mounting head 15 is raised or lowered.
The structure of the cylinder 48 will be described in detail below with reference to FIGS.

First, reference numeral 80 denotes an air tank which communicates with an air supply source to increase the volume of air and suppress a rise in pressure. The tank 80 communicates with a cylinder body 82 via a communication passage 81. The cylinder body 82 is provided with a switching valve (not shown). The rod 83 of the cylinder 48 performs a component mounting operation at a cam timing with a large acceleration.
9, the air from the air supply source (not shown) is guided to the cylinder body 82 through the air tank 80 and the communication passage 81, as shown in FIG. As a result, the air introduced from the opening 84 is guided to the sliding path 86 of the rod 83 via the passage 85 and the enlarged diameter portion 8 of the rod 83 via the passage 87.
The rod 83 is guided to a space 89 in which the rod 3A slides, and the rod 83 is moved to the left. The passage 85 and the sliding path 86
Is guided to a passage 88 formed in the rod 83, and the high-pressure air via the passage 87 and the space 89 is guided to the passage 88 via the passage 90, and then to the space 89A via the passage 91. Then, it is guided to the outside of the cylinder body 82 through the passage 92 and the opening 93.

In the case where the rod 83 of the cylinder 48 is operated to be retracted so as to perform the component mounting operation at a normal cam timing with a small acceleration, as shown in FIG. 8, an air supply source (not shown) Is guided to the cylinder main body 82 via the air tank 80 and the communication passage 81, and is guided to the space 89A via the opening 93 and the passage 92 by a switching valve (not shown), and hits the enlarged diameter portion 83A of the rod 83 to cause the rod 83 to move. Retract, passage 91
The fluid flows through the passage 88 and is guided to the sliding path 86, is guided to the outside of the cylinder body 82 through the opening 84 via the passage 85, and is guided to the space 89 via the passage 90 and is connected to the passage 87.
Through the opening 84 to the outside of the cylinder body 82.

As described above, the passage 88 communicating between the high pressure side, ie, the rod side, and the low pressure side, ie, the non-rod side of the cylinder 48 is formed so that air always flows.
The pressure increase during compression is avoided and the thermal load due to the temperature increase is reduced, thereby extending the life of the cylinder 48. Further, the cylinder 48 itself can be cooled by the flow of the air.

In FIG. 2, reference numeral 56 denotes an index unit. The rotation of the output shaft of a motor (not shown) is reduced by a speed reducer 59 and input to the unit 56. The output shaft of the unit 56 is intermittently set at a predetermined speed. The rotation of the rotary table 13 is determined and the intermittent rotation of the rotary table 13 connected to the output shaft is driven. An index input shaft (not shown) which is an output shaft of the speed reducer 59 is connected to an index unit 56.
The cam shaft 63 to which the cam 44 is fixed is provided through the housing 62 of the index unit 56.
3 is rotatably supported by the housing 62, and as close as possible to a straight line connecting the suction station I and the mounting station III at a position avoiding the structure that drives the intermittent rotation inside the unit 56; It is provided as low as possible.

A timing belt is stretched between the cam shaft pulley fixed to the cam shaft 63 and the input shaft pulley fixed to the index input shaft, and the rotation of the input shaft is transmitted to the cam shaft 63. It has been made. Therefore, the cam shaft 63 rotates in synchronization with the intermittent rotation of the rotary table 13 via the index unit 56 by the rotation of a motor (not shown), and either the inner surface 46 or the outer surface 47 of the groove 45 formed in the cam 44. The cam follower 43, which rolls in contact with the shaft, moves up and down, and the lever 41 provided with the cam follower 43 swings around the support shaft 49 and is supported by the lever 41 via the roller 40. The vertical rail 38 urged upward is moved up and down, and the mounting head 15 at the suction station I and the mounting station III is raised and lowered.

As described above, the cam follower 43 is pressed into contact with either the inner side surface 46 or the outer side surface 47 of the groove 45 formed in the cam 44, so that the component mounting operation is performed at a different timing, that is, at a different timing. However, by this switching, the play of the cam follower 43, the lever 41
Due to the deflection, the gap between the groove 45 of the cam 44 and the cam follower 43, a change in the upper limit position of the roller rest 37 and a change in the lower limit position when mounting components occur. Then, due to the difference between these positions, the cam follower 3 is caused by a step.
2 cannot move smoothly on the roller rest 37, and the electronic components 5 sucked by the suction nozzles 14 drop due to vibrations, and the electronic components 5 are displaced even if they do not fall down. A situation arises in which it cannot be mounted in a proper position.

Therefore, it is necessary to correct the change by a correction mechanism. The correction mechanism will be described below with reference to FIGS.

That is, an eccentric shaft 70 eccentric to the cam shaft 63 is fixed to the cam shaft 63, and two cylindrical projections 72 provided on a mounting plate 71 provided on the eccentric shaft 70. One of them is fitted into an engagement hole 74 formed in the rocking plate 73. Then, as shown in FIG. 10, the cylinder 76 is actuated by using
When the eccentric shaft 70 is slightly rotated by projecting and swinging the cam 7, the cam shaft 63 is raised. Therefore, as described above, when the cam follower 43 is pressed against the outer surface 47 of the groove 45 so as to perform the component mounting operation at a cam timing with a large acceleration when interfering with the electronic component already mounted on the printed board at the time of mounting. As shown in FIG. 6, the upper surface position of the roller rest 37 at the upper limit position can be the same as the upper surface position of the cylindrical rib cam 35.

Further, as shown in FIG.
When the cylinder 76 is reversely operated with the support shaft 75 as a fulcrum and the rod 77 is retracted and swung, the eccentric shaft 70 is slightly reversely rotated to lower the cam shaft 63. Therefore, as described above, even when the cam follower 43 is pressed against the inner side surface 46 of the groove 45 so as to perform the component mounting operation at a cam timing with a small acceleration at the time of normal electronic component mounting, as shown in FIG. 3
7 can be the same as the upper surface position of the cylindrical rib cam 35.

The operation of the above configuration will be described below. First, when an operation unit (not shown) is operated, the automatic operation of the electronic component automatic mounting apparatus is started. That is, the rotary table 13 intermittently rotates via the index unit 56 by the rotation of a motor (not shown), and one of the mounting heads 15 reaches the suction station I and stops. During the movement of the mounting head 15, the cam followers 32, 33 move while being guided by the cylindrical rib cam 35, move on the roller rest 37, and stop.

Next, while the head 15 is moving to the suction station I, the supply table 7 is moved according to the mounting data stored in the storage unit (not shown) to supply the electronic components 5 to be supplied. 8 stops at the suction position of the suction nozzle 14 of the suction station I, and the electronic component 5 is sucked and taken out by the lowering of the nozzle 14 due to the lowering of the head 15.

That is, when the head 15 stops, the cam (not shown) rotates by the rotation of the index input shaft, and the elevating lever 26 moves up and down to swing the swinging lever 27 and feeds a tape (not shown) to take out the part 5. The vertical rail 38 is supported via a roller 40, and the vertical rail 38 is guided by a slide unit 39 to descend. Therefore, the mounting head 15 is lowered and the suction nozzle 14
Removes the electronic component 5 by vacuum suction, and further removes the cam 44.
The head 15 is raised by the rotation of.

Next, when the index input shaft is further rotated, the rotary table 13 starts moving from the stopped state, and moves to the next station with the suction nozzle 14 holding the electronic component 5. During this time, the cam follower 32,
33 moves from the roller rest 37 to the cylindrical rib cam 35.

Next, the other head 15 moves to the suction station I in the same manner, and the component 5 is suctioned in the same manner. Next, the mounting head 15 holding the electronic component 5 is recognized by the intermittent rotation of the rotary table 13.
When the electronic component 5 is moved to the option II, the electronic component 5 sucked by the suction nozzle 14 is recognized by the component recognition device 16.

When the positional deviation of the component 5 with respect to the rotation center of the nozzle 14 is recognized, correction is performed based on the recognition result, and the component 5 is set in the mounting head 15 so as to face the direction indicated by the mounting data (not shown). Is driven to rotate the suction nozzle 14.

During this time, the rotary table 13 intermittently rotates to reach the mounting station III, and the electronic component 5 for which the angular positioning has been completed is mounted on the printed board 6 positioned by the movement of the XY table 3. The positioning is performed by correcting the recognition result so as to be mounted at the position indicated by the mounting data. The mounting head 15 is raised and lowered by rotating the cam shaft 63 in the same manner as the lifting and lowering at the suction station I. The operation will be described in detail below.

That is, in order to perform the component mounting operation at a cam timing in which the elevation of the mounting head 15 is normally low, the cylinder 48 is connected to the rod 48 as shown in FIG. 83
The lever 41 connected to the rod 83 is urged so as to swing counterclockwise about the support shaft 49 with the operation of pulling in.

At this time, as shown in FIG. 8, the state of the cylinder 48 is such that air from an air supply source (not shown) is guided to a cylinder main body 82 through an air tank 80 and a communication passage 81, and a switching (not shown) The valve is guided to the space 89A through the opening 93 and the passage 92 by the valve, and hits the enlarged diameter portion 83A of the rod 83 so that the rod 83 is retracted.
The fluid flows through the passage 88 and is guided to the sliding path 86, is guided to the outside of the cylinder body 82 through the opening 84 via the passage 85, and is guided to the space 89 via the passage 90 and is connected to the passage 87.
Through the opening 84 to the outside of the cylinder body 82.

As shown in FIG. 11, the eccentric shaft 70 is slightly rotated by operating the cylinder 76 with the oscillating plate 73 using the support shaft 75 as a fulcrum and pulling the rod 77 to oscillate. Since the cam shaft 63 is lowered, the upper surface position of the roller rest 37 at the upper limit position is the same as the upper surface position of the cylindrical rib cam 35 as shown in FIG.
As the cam 44 further rotates, the lever 41 swings as shown in FIG. 5, and the vertical rail 38 is guided by the slide unit 39 to descend. 15 moves down and suction nozzle 1
The electronic component 5 sucked by the component 4 is mounted on a printed circuit board 6.

In the case of interference with an electronic component already mounted on the printed circuit board at the time of mounting, the cam follower 4 performs a component mounting operation at a cam timing with a large acceleration.
As shown in FIG. 6, the lever 41 is swung clockwise about the support shaft 49 with the cylinder 48 being operated so as to protrude the rod 83 so as to press the 3 against the outer surface 47 of the groove 45. Energize to be.

At this time, as shown in FIG. 9, the state of the cylinder 48 is such that air from an air supply source (not shown) is guided to the cylinder body 82 through the air tank 80 and the communication passage 81, The air introduced from the opening 84 by the valve is guided to the sliding path 86 of the rod 83 via the passage 85 and is guided to the space 89 for sliding the enlarged diameter portion 83A of the rod 83 via the passage 87. 83 is moved to the left. The high-pressure air passing through the passage 85 and the sliding passage 86 is guided to a passage 88 formed in the rod 83, and the high-pressure air passing through the passage 87 and the space 89 is guided to the passage 88 through a passage 90. , Through the passage 91 to the space 89A,
And through the opening 93 to the outside of the cylinder body 82.

Thus, the high-pressure air is always supplied to the rod 83.
Since the pressure is increased by the passage 88 formed during compression, pressure rise during compression can be avoided, thermal load due to temperature rise can be reduced, and the life of the cylinder 48 can be prolonged. Can also be cooled.

As shown in FIG. 10, the eccentric shaft 70 is slightly rotated by operating the cylinder 76 using the oscillating plate 73 with the fulcrum 75 as a fulcrum and protruding the rod 77 to oscillate. Raise the cam shaft 63,
The upper surface position of the roller rest 37 at the upper limit position is the same as the upper surface position of the cylindrical rib cam 35, and the cam follower 32 is smoothly moved onto the roller rest 37. Swings, the vertical rail 38 is guided by the slide unit 39 and descends, so that the mounting head 15 is lowered and the electronic component 5 sucked by the suction nozzle 14 is mounted on the printed circuit board 6. Installed without interference with parts.

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-described various embodiments without departing from the spirit thereof. It is intended to cover alternatives, modifications or variations.

[0046]

As described above, according to the first aspect of the present invention, when the mounting head is moved up and down in a normal manner, a small acceleration is used. That is, the operation can be performed with a short timing of the allocation, and the mounting speed of the components can be further increased.

According to the second and third aspects of the present invention, the cam follower can smoothly move on the roller rest at the time of mounting the component, and the electronic component sucked by the suction nozzle may drop due to vibration, Displacement is reduced, and it can be mounted on a printed board at an accurate position.

[Brief description of the drawings]

FIG. 1 is a plan view of an electronic component mounting device.

FIG. 2 is a side view of the electronic component mounting apparatus.

FIG. 3 is a side view showing the mounting head.

FIG. 4 is a side view showing a mechanism for elevating and lowering the mounting head (elevated state).

FIG. 5 is a side view showing a mechanism for moving the mounting head up and down (down state).

FIG. 6 is a side view showing a mechanism for moving the mounting head up and down (ascending state).

FIG. 7 is a side view showing a mechanism for moving the mounting head up and down (down state).

FIG. 8 is a partial cross-sectional view illustrating a state where a rod of a cylinder is retracted.

FIG. 9 is a partial cross-sectional view showing a state where a rod of a cylinder is protruding.

FIG. 10 shows a rear view of the correction mechanism.

FIG. 11 shows a rear view of the correction mechanism.

FIG. 12 is a partial cross-sectional view of a correction mechanism.

[Explanation of symbols]

 14 suction nozzle 15 mounting head 41 lever 43 cam follower 44 cam 45 groove 46 inner surface 47 outer surface 63 cam shaft 70 eccentric shaft 76 cylinder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Kurata 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yoshinori Kano 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 F-term in Sanyo Electric Co., Ltd. (reference) 5E313 CC03 CD06 EE01 EE34

Claims (3)

[Claims] A plurality of mounting heads arranged on a peripheral edge of a rotary table intermittently rotated by driving of an index unit move up and down with respect to the rotary table by rotation of a cam at a component mounting position to take out electronic components; In an electronic component mounting apparatus for mounting the electronic component on a printed circuit board by the mounting head moved by rotation of a table, a cam follower provided on a lever for raising and lowering the mounting head by forming a groove in the cam. An electronic component mounting device, wherein the ascending and descending acceleration is changed between when the cam contacts the inner surface and the outer surface of the groove of the cam. 2. The electronic component mounting apparatus according to claim 1, further comprising a mechanism for raising and lowering a cam shaft of the cam. 3. The camshaft is provided with an eccentric shaft eccentric to the camshaft, and the camshaft is moved up and down by rotating the eccentric shaft.
An electronic component mounting device according to claim 1.