JP3921339B2 - Electronic component mounting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a plurality of mounting heads arranged on the periphery of a rotary table that rotates intermittently by driving an index unit moves up and down with respect to the rotary table by rotation of a cam at a component mounting position, and takes out the electronic component. The present invention relates to an electronic component mounting apparatus that mounts the electronic component on a printed circuit board with the mounting head moved by the rotation of the electronic component.
[0002]
[Prior art]
Such a conventional technique is generally a technique in which a cam follower provided on a lever for raising and lowering the mounting head is pressed against the cam by a spring as disclosed in Japanese Patent Application Laid-Open No. 8-195590.
[0003]
[Problems to be solved by the invention]
However, when a cylinder is used in place of this spring in order to avoid a change with time of the biasing force of the spring and to switch the pressure contact surface of the cam follower with respect to the cam, high-pressure air enters one side of the cylinder. In this state, the air is compressed and expanded. For this reason, if this operation is performed continuously at high speed, a thermal load is applied to the cylinder, and the life is shortened.
[0004]
Therefore, the present invention forms a passage that connects the high-pressure side and the low-pressure side of the cylinder so that air always flows through the passage, thereby avoiding an increase in pressure during compression and reducing a thermal load due to a temperature rise. The purpose of this is to extend the life of the cylinder.
[0005]
[Means for Solving the Problems]
For this reason, according to the first aspect of the present invention, a plurality of mounting heads arranged on the periphery of the rotary table that rotates intermittently by driving the index unit moves up and down with respect to the rotary table by rotating the cam at the component suction position . In an electronic component mounting apparatus that mounts the electronic component on a printed circuit board by the mounting head that has been taken out and moved by rotation of the table, the electronic component mounting device is provided between the cam and the mounting head to raise and lower the mounting head. A lever and a cylinder for press-contacting the cam follower provided on the lever to the cam are formed, and a passage that connects the high pressure side and the low pressure side is formed in the cylinder so that air always flows through the passage. It is characterized by that.
[0007]
The second invention is characterized in that an air tank is provided between the cylinder and the air supply source.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a Y table that moves in the Y direction by driving the Y-axis motor 2, and reference numeral 3 denotes an XY result by moving in the X direction on the Y table 1 by driving the X-axis motor 4. An XY table that moves in a direction, and a printed circuit board 6 on which a chip-like electronic component 5 is mounted is fixed and placed on a fixing means (not shown).
[0009]
Reference numeral 7 denotes a supply stand, on which a number of component supply devices 8 for supplying the electronic components 5 are arranged. Reference numeral 9 denotes a supply table driving motor. When the ball screw 10 is rotated, the supply table 7 is guided to the linear guide 12 through a nut (not shown) fitted to the ball screw 10 and fixed to the supply table 7. Move in the X direction. Reference numeral 13 denotes a rotary table that rotates intermittently. As will be described later, mounting heads 15 having a plurality of suction nozzles 14 are arranged at equal intervals in accordance with the intermittent pitch.
[0010]
The stop position of the mounting head 15 where the suction nozzle 14 picks up and picks up the component 5 from the component supply device 8 (the position indicated by the black circle in the upper part in FIG. 1) is the suction station I. When 15 is lowered, the suction nozzle 14 sucks the component 5.
[0011]
II is a recognition station in which the mounting head 15 that sucks the component 5 stops due to the intermittent rotation of the rotary table 13, and the component recognition device 16 recognizes the positional deviation of the component 5 with respect to the suction nozzle 14.
[0012]
Reference numeral III denotes a mounting station (a position indicated by a black circle in the lower part of FIG. 1) where the mounting head 15 stops in order to mount the component 5 held by the suction nozzle 14 on the printed circuit board 6. The component 5 is mounted on the printed circuit board 6 that has been stopped at a predetermined position by the movement of the XY table 3 due to the lowering of the rotary table 13.
[0013]
Next, in FIG. 2, the component supply device 8 engages the swing lever 27 with a lift lever 26 that lifts and lowers the electronic component 5 enclosed in a tape (not shown) wound around a tape reel 28 by a mechanism (not shown). The feed suction nozzle 14 is supplied to the take-out position of the feed suction nozzle 14 pitch by pitch.
[0014]
The mounting head 15 will be described below with reference to FIGS. The mounting head 15 is attached to a head upper and lower table 29 attached to the guide rail 17, and a nut body 30 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.
[0015]
A mounting plate 31 is attached to the upper portion of the head upper and lower table 29, and a pair of cam followers 32 and 33 are attached to the mounting plate 31. The pair of cam followers 32 and 33 sandwich a cylindrical rib cam 35 that is suspended and fixed below the frame 34 when the cam follower 33 is biased upward by a spring (not shown). When the cam followers 32 and 33 sandwich the cylindrical rib cam 35, the vertical position is restricted, and the head 15 is moved by intermittent rotation of the rotary table 13.
[0016]
Further, a motor (not shown) is incorporated in the head 15 and rotates the suction nozzle 14 around the vertical axis. A plurality of nozzles 14 are provided in a position eccentric to the rotation center axis in the head 15 so as to be able to enter and leave the head 15.
[0017]
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 movable up and down. Therefore, the head 15 moves up and down while the intermittent rotation is stopped at the station, and the electronic component 5 is sucked and mounted, but the lifting mechanism is the same mechanism.
[0018]
The roller rest 37 is attached to a vertical rail 38, and the vertical rail 38 is guided by a slide unit 39 fixed to the frame 34 to move up and down. The vertical rail 38 is moved to a lever 41 via a roller 40. It is supported.
[0019]
The cam follower 43 is fitted into a groove 45 formed in the cam 44, and the cam follower 43 is in pressure contact with an inner side surface 46 or an outer side surface 47 forming the groove 45. As a result, the vertical rail 38, that is, the mounting head 15 (the suction nozzle 14) moves up and down.
[0020]
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 side surface 46 or the outer side surface 47 of the groove 45 to change the cam timing. In this case, normally, the acceleration of the mounting head 15 is small, that is, the allocation is long (the head starts to descend quickly and the time required to move up and down is long). 4 and 5, the cylinder 48 is operated so as to retract the rod 83 as shown in FIGS. 4 and 5, and the lever 41 connected to the rod 83 is counterclockwise with the support shaft 49 as a fulcrum. To oscillate to
On the other hand, when the electronic component already mounted on the printed circuit board interferes with the mounting, the component mounting operation is performed at the cam timing when the acceleration is large, that is, the allocation is short (the head starts to descend 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, the cylinder 41 is operated so as to project the rod 83 as shown in FIGS. It is urged to swing in the direction.
[0021]
As described above, the cylinder 48 is switched so as to perform the component mounting operation at a timing when the acceleration of the lifting / lowering of the mounting head 15 is small or large. The structure of this cylinder 48 is shown in FIGS. The details will be described below.
[0022]
First, 80 is an air tank that communicates with an air supply source to increase the air volume and suppress the pressure rise. The tank 80 communicates with the cylinder body 82 via a communication passage 81. When the cylinder body 82 is provided with a switching valve (not shown) and is operated so as to protrude the rod 83 of the cylinder 48 so as to perform the component mounting operation at a cam timing with a large acceleration, as shown in FIG. Air from an air supply source (not shown) is guided to the cylinder body 82 via the air tank 80 and the communication path 81, and the air introduced from the opening 84 by the switching valve (not shown) passes through the path 85 to the rod 83. The rod 83 is guided to the sliding path 86 and is guided to the space 89 through which the enlarged diameter portion 83A of the rod 83 slides through the passage 87, and the rod 83 is moved to the left. The high-pressure air passing through the passage 85 and the sliding passage 86 is guided to the 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 the passage 90. The air is guided to the space 89A through the passage 91, and is guided out of the cylinder body 82 through the passage 92 and the opening 93.
[0023]
Further, when operating to retract the rod 83 of the cylinder 48 so as to perform the component mounting operation at a cam timing with a small normal acceleration, as shown in FIG. 8, air from an air supply source (not shown) is used. 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 through the opening 93 and the passage 92 by a switching valve (not shown) so as to hit the diameter-expanded portion 83A of the rod 83 and pull the rod 83, It flows through the passage 91 and the passage 88 and is guided to the sliding path 86 and is guided to the outside of the cylinder body 82 through the opening 85 through the passage 85, and is guided to the space 89 through the path 90 and through the passage 87. It is guided out of the cylinder body 82 through the opening 84.
[0024]
As described above, a passage 88 that connects the high-pressure side of the cylinder 48, that is, the rod side and the low-pressure side, that is, the non-rod side is formed, and air is always allowed to flow to avoid an increase in pressure during compression. The lifetime of the cylinder 48 is extended by reducing the thermal load due to temperature rise. Further, the cylinder 48 itself can be cooled by this air flow.
[0025]
Next, in FIG. 2, 56 is an index unit, and the rotation of the output shaft of a motor (not shown) is decelerated by the speed reducer 59 and input to the unit 56, and the output shaft of the unit 56 intermittently determines a predetermined angle. It rotates and drives the intermittent rotation of the rotary table 13 connected to the output shaft. An index input shaft (not shown) that is an output shaft of the speed reducer 59 is provided through the housing 62 of the index unit 56, and the cam shaft to which the cam 44 is fixed is mounted on the housing 62 of the index unit 56. The cam shaft 63 is rotatably supported by the housing 62, and the suction station I and the mounting station I are installed at a position avoiding the structure that drives the intermittent rotation inside the unit 56. It is as close as possible to the straight line connecting the section III and as low as possible.
[0026]
A timing belt is stretched between the camshaft pulley fixed to the camshaft 63 and the input shaft pulley fixed to the index input shaft so that the rotation of the input shaft is transmitted to the camshaft 63. 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 due to 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 that rolls in contact with the roller moves up and down, 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 and is lowered by a spring (not shown). The vertical rail 38 that is biased to the vertical position 38 is moved up and down, and the mounting head 15 is moved up and down at the suction station I and the mounting station III.
[0027]
As described above, the cam follower 43 is brought into pressure contact with either the inner surface 46 or the outer surface 47 of the groove 45 formed in the cam 44, so that the component mounting operation is performed at different timings of acceleration, that is, allocation. As a result of this switching, a change in the upper limit position of the roller rest 37 and a change in the lower limit position during component mounting occur due to backlash of the cam follower 43, deflection of the lever 41, a gap between the groove 45 of the cam 44 and the cam follower 43, and the like. Then, due to the difference in position, the cam follower 32 cannot be smoothly transferred onto the roller rest 37 due to a step, and the vibration causes the electronic component 5 sucked by the suction nozzle 14 to fall or not fall. In this case, the positional deviation occurs, and the printed board 6 cannot be mounted at an accurate position.
[0028]
Accordingly, it is necessary to correct the change by a correction mechanism, and the correction mechanism will be described below with reference to FIGS.
[0029]
That is, an eccentric shaft 70 that is eccentric from the cam shaft 63 is fixed to the cam shaft 63, and one of two columnar protrusions 72 provided on a mounting plate 71 provided on the eccentric shaft 70. The pieces are fitted into engagement holes 74 provided in the swing plate 73. Then, as shown in FIG. 10, when the eccentric shaft 70 is slightly rotated by operating the cylinder 76 with the support shaft 75 as a fulcrum to project the rod 77 and swinging, the cam 73 The shaft 63 rises. Therefore, as described above, when the cam follower 43 is pressed against the outer surface 47 of the groove 45 so that the component mounting operation is performed at a cam timing with a large acceleration when the electronic component already mounted on the printed circuit board interferes with the mounting. 6, the upper surface position at the upper limit position of the roller rest 37 can be made the same as the upper surface position of the cylindrical rib cam 35.
[0030]
Also, as shown in FIG. 11, when the eccentric shaft 70 is slightly rotated in the reverse direction by reversing the cylinder 76 with the support shaft 75 as a fulcrum, and pulling and swinging the rod 77 as shown in FIG. The cam shaft 63 descends. Therefore, as described above, even when the cam follower 43 is pressed against the inner surface 46 of the groove 45 so that the component mounting operation is performed at a cam timing with a small acceleration when mounting a normal electronic component, as shown in FIG. The upper surface position at the upper limit position 37 can be made the same as the upper surface position of the cylindrical rib cam 35.
[0031]
The operation will be described below with the above configuration. First, when an operation unit (not shown) is operated, automatic operation of the electronic component automatic mounting apparatus is started. That is, the rotary table 13 is intermittently rotated through 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 and 33 are guided by the cylindrical rib cam 35 and move to the roller rest 37 and stop.
[0032]
Next, while the head 15 is moved to the suction station I, the component supply device 8 of the electronic component 5 to be moved and supplied according to the mounting data stored in the storage unit (not shown) is sucked. The station is stopped at the suction position of the suction nozzle 14 of the 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.
[0033]
That is, when the head 15 is stopped, the cam (not shown) is rotated by the rotation of the index input shaft, the elevating lever 26 is raised and lowered to swing the swing lever 27, and the tape (not shown) is sent to supply the component 5 to the take-out position. On the other hand, the lever 41 is swung by the rotation of the cam 44, and the vertical rail 38 is supported via the roller 40. The vertical rail 38 is guided by the slide unit 39 and descends. Accordingly, the mounting head 15 is lowered, the suction nozzle 14 sucks out the electronic component 5 by vacuum suction, and the head 15 is raised by further rotation of the cam 44.
[0034]
Next, when the index input shaft further rotates, the rotary table 13 starts moving from the stopped state, and the suction nozzle 14 moves to the next station while holding the electronic component 5. During this time, the cam followers 32 and 33 are transferred from the roller rest 37 to the cylindrical rib cam 35.
[0035]
Next, the other head 15 moves in the same manner to the suction station I, and suction of the component 5 is performed in the same manner. Next, when the mounting head 15 holding the electronic component 5 is moved to the recognition station II due to the intermittent rotation of the rotary table 13, the electronic component 5 sucked by the suction nozzle 14 is recognized by the component recognition device 16. .
[0036]
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 motor in the mounting head 15 moves so that the component 5 faces in the direction indicated by the mounting data (not shown). The suction nozzle 14 is driven to rotate.
[0037]
During this time, the rotary table 13 rotates intermittently to reach the mounting station III, and the electronic component 5 whose angular positioning has been completed is mounted on the printed circuit board 6 positioned by the movement of the XY table 3. The positioning is performed with correction of the recognition result added so as to be mounted at the position indicated by the mounting data. The mounting head 15 is lifted and lowered by the rotation of 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.
[0038]
That is, normally, the cylinder 48 is pulled into the rod 83 as shown in FIG. 4 so that the cam follower 43 is pressed against the inner surface 46 of the groove 45 so that the component mounting operation is performed at a cam timing at which the acceleration of the mounting head 15 is small. In this state, the lever 41 connected to the rod 83 is biased so as to swing counterclockwise about the support shaft 49 as a fulcrum.
[0039]
As shown in FIG. 8, the state of the cylinder 48 at this time is that air from an air supply source (not shown) is guided to the cylinder body 82 via the air tank 80 and the communication path 81, and is opened by a switching valve (not shown). 93 and the passage 92 are guided to the space 89 </ b> A so as to contact the diameter-expanded portion 83 </ b> A of the rod 83, and the rod 83 is drawn. Then, the gas is guided out of the cylinder main body 82, guided into the space 89 through the passage 90, and guided out of the cylinder main body 82 through the opening 84 through the passage 87.
[0040]
Further, as shown in FIG. 11, the eccentric shaft 70 is slightly rotated by operating the cylinder 76 with the support shaft 75 as a fulcrum and pulling the rod 77 to swing, so that the cam shaft As shown in FIG. 4, 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 put on the roller rest 37. As shown in FIG. 5, when the cam 44 further rotates, the lever 41 swings, and the vertical rail 38 is guided and lowered by the slide unit 39, so that the mounting head 15 is lowered. The electronic component 5 sucked by the suction nozzle 14 is mounted on the printed board 6.
[0041]
Further, in the case of interference with an electronic component already mounted on the printed circuit board, 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, as shown in FIG. In this way, the cylinder 48 is operated so as to protrude the rod 83, and the lever 41 is urged to swing clockwise with the support shaft 49 as a fulcrum.
[0042]
The state of the cylinder 48 at this time is as shown in FIG. 9, in which 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, and is opened by a switching valve (not shown). The air introduced from 84 is guided to the sliding path 86 of the rod 83 through the passage 85 and is guided to the space 89 in which the enlarged diameter portion 83A of the rod 83 is slid through the passage 87. Move towards. The high-pressure air passing through the passage 85 and the sliding passage 86 is guided to the 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 the passage 90. The air is guided to the space 89A through the passage 91, and is guided out of the cylinder body 82 through the passage 92 and the opening 93.
[0043]
In this way, since the high-pressure air is always guided to the passage 88 formed in the rod 83, an increase in pressure during compression can be avoided, the thermal load due to the temperature increase can be reduced, and the life of the cylinder 48 can be extended. The cylinder 48 itself can be cooled by this air flow.
[0044]
Further, as shown in FIG. 10, the eccentric shaft 70 is slightly rotated by operating the cylinder 76 with the support shaft 75 as a fulcrum so that the rod 77 protrudes and swings, so that the cam shaft 63 is raised, the upper surface position of the roller rest 37 at the upper limit position is made the same as the upper surface position of the cylindrical rib cam 35, and the cam follower 32 is smoothly transferred onto the roller rest 37, and the cam 44 further rotates. As a result, the lever 41 swings and the vertical rail 38 is guided and lowered by the slide unit 39, so that the mounting head 15 descends and the electronic component 5 adsorbed by the adsorption nozzle 14 is placed on the printed circuit board 6. It is mounted without interfering with the already mounted electronic components.
[0045]
Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various alternatives described above without departing from the spirit of the present invention. It includes modifications or variations.
[0046]
【The invention's effect】
As described above, according to the present invention, a passage that connects the high-pressure side and the low-pressure side of the cylinder is formed, and air is always flowed to avoid an increase in pressure during compression and to reduce a thermal load due to a temperature increase. Thus, the life of the cylinder can be extended. The cylinder itself can also be cooled by this air flow. Furthermore, since the air tank is provided between the cylinder and the air supply source, the pressure increase can be suppressed by increasing the air volume.
[Brief description of the drawings]
FIG. 1 is a plan view of an electronic component mounting apparatus.
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 raising and lowering the mounting head (in a raised state).
FIG. 5 is a side view showing a mechanism for raising and lowering the mounting head (lowered state).
FIG. 6 is a side view showing a mechanism for raising and lowering the mounting head (upward state).
FIG. 7 is a side view showing a mechanism for raising and lowering the mounting head (lowered state).
FIG. 8 is a partial cross-sectional view showing a state in which a cylinder rod is retracted.
FIG. 9 is a partial cross-sectional view showing a state where a rod of a cylinder protrudes.
FIG. 10 is a rear view of the correction mechanism.
FIG. 11 is 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 48 Cylinder 63 Cam shaft 70 Eccentric shaft 76 Cylinder 83 Rod 88 Passage

Claims (2)

A plurality of mounting heads arranged on the periphery of the rotary table that rotates intermittently by driving the index unit moves up and down with respect to the rotary table by rotating the cam at the component suction position , and moves by rotating the table. In the electronic component mounting apparatus for mounting the electronic component on the printed circuit board using the mounting head, a lever provided between the cam and the mounting head for moving the mounting head up and down is provided on the lever. And a cylinder for press-contacting the cam follower to the cam, and a passage communicating the high pressure side and the low pressure side is formed in the cylinder so that air always flows through the passage. Mounting device.   The electronic component mounting apparatus according to claim 1, wherein an air tank is provided between the cylinder and an air supply source.

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