JPH0573941B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a device that provides movement to mechanical elements using a cam, and can be used in various industrial machines.

(B) Prior Art When converting the rotation of a cam into linear motion, there are cases where it is desired to change the stroke of the linear motion. In order to meet this demand, JP-A-57-
Devices such as those described in Japanese Patent Nos. 89535 and 62-85490 have been proposed. By the way, when considering the mechanism of these devices, the former adopts a method of cutting off the long stroke movement in the middle to obtain short stroke movement, so the smooth movement that follows the cam curve is suddenly interrupted. This is not a desirable operation. On the other hand, in the latter case, the width of the stroke is adjusted by changing the fulcrum position of the lever using a stroke adjustment lever, so movement according to the cam curve is ensured regardless of the length of the stroke. However, even with this mechanism, it cannot meet the demand for changing the shape of the cam curve itself.

(c) Problems to be Solved by the Invention The present invention seeks to provide a cam movement switching device that allows selection of not only the stroke but also the cam curve.

(d) Means for Solving the Problems In the present invention, first and second cams are arranged side by side on a common camshaft, and the first and second cam followers are brought into contact with each cam. The first cam follower is provided with a cam movement output. One or both of the first and second cam followers is provided with an actuator that pushes the other cam follower as necessary.

(E) Function When the actuator does not push the mating cam follower, the first cam follower contacts the first cam, and movement by the first cam occurs in the cam movement output section. When the actuator pushes the mating cam follower, the first cam follower becomes supported by the second cam follower, and the cam movement output section is given movement by the second cam.

(F) Embodiment The figure shows an example in which the present invention is applied to a chip component mounting device, and this will be explained below. In FIGS. 11 to 14, 11 is a mounting unit, and 12 is a rotary index table type support device which forms the main body of the mounting unit 11. In FIGS.
The support device 12 supports the bearing portion 14 of the mounting frame 13.
The rotary shaft 15 is fixed to the lower end of a rotating shaft 15 that is vertically supported. The rotating shaft 15 is intermittently rotated in one direction by an index drive device 16 supported on the device frame 13, thereby causing the support device 12 to rotate intermittently in a horizontal plane. The rotating shaft 15 is hollow, and the cavity at its center serves as a vacuum suction path 17 connected to a vacuum source (not shown). The lower end opening of the vacuum suction path 17 is closed with a stopper 19 provided with a plurality of connecting fittings 18 for connecting vacuum hoses.

21 are work stations A to J shown in FIG.
This is a vacuum suction device that rotates around the A total of 10 vacuum suction devices 21 are arranged at equal intervals around the outer circumference of the support device 12. Each vacuum suction device 21 is supported by a bearing block 22 fixed to the support device 12 so as to be movable up and down. In FIG. 11, two vertical rods 23 arranged in a direction perpendicular to the paper surface slidably pass through the bearing block 22, and connecting plates 24 and 25 are fixed to the upper and lower ends, respectively. There is. A lower connecting plate 25 supports the vacuum suction device 21 . The vacuum suction device 21 has a total of four suction nozzles 27 projected at 90° intervals around a turret 26 that rotates around a horizontal axis. The four suction nozzles 27 are of different types. The vacuum suction device 21 is connected to a vacuum switching valve 28 installed on the bearing block 22 by a vacuum hose (not shown), and the vacuum switching valve 28 is also connected to the connecting fitting 18 by a vacuum hose (not shown).
connected to.

The connecting plate 24 has an "L" shape, and supports 12 are provided on both sides of the vertically rising part.
A roller 31 is mounted facing the center of rotation of the roller 31, and a roller 32 is mounted facing the opposite direction. Both rollers 31 and 32 are rotatable around a horizontal axis. 33 is an annular cam member fixed to the mounting frame 13, and the roller 31 engages with a cam surface 34 on the outer periphery of the annular cam member. That is, the structure 35 including the connecting plate 24, the rod 23, the connecting plate 25, and the vacuum suction device 21 is suspended from the cam member 33 by the roller 31, and as the support device 12 rotates, It moves up and down following the contour of the cam surface 34. In certain work stations, the lowering passage 36 of the roller 31 is provided branching off from the cam surface 34 in order to give the vacuum suction device an extra large lifting stroke during periods when the support device 12 is at rest. At this point, the roller 31 is no longer supported, but instead, the roller 32 engages with the support member 37 and plays the role of suspending the structure instead of the roller 31. Support member 3
7 is fixed to the lower end of a vertical rod 38 and constitutes a lifting device 39. Rod 38 is device frame 1
It is supported by a bearing part 40 fixed to 3. The rod 38 is given, at a predetermined timing, a downward to upward movement of a stroke length required by the work station by a drive mechanism to be described later.
The roller 31, which has finished descending and has risen, then moves again to the cam surface 3 as the support device 12 starts moving.
4, and the other roller 32 is removed from the support member 37. A combination of such a descending passage 36 and a lifting device 39 is provided at work stations A, C, D, and F (see FIG. 14).
In order to ensure that the roller 31 or 32 contacts the cam surface 34 or the support member 37, a tension coil spring is installed between the bracket member 41 that projects horizontally from the top of the rod 23 and the stay 42 that is fixed to the support device 12. 43 and pull the structure 35 downward with the force of this spring. The tension coil spring 43 passes through a hole 44 that passes vertically through the support device 12.

At the work stations A to J, the vacuum suction device 21 performs the work as follows. At work station A, the vacuum suction device 21 sucks up the chip-shaped electronic component 1 from the component supply tape 51. Work station B has a vacuum suction device 21.
A transmission type optical sensor 52 is arranged to check whether or not the chip-shaped electronic component 21 is being attracted. A component position adjustment device 53 is arranged at work stations C and D. The component position adjustment device 53 has claws 56 supporting the chip-shaped electronic component 1 on a rotary disk 54, and the vacuum suction device 2
Centering and angle determination of the chip-shaped electronic component 1 with respect to the chip-shaped electronic component 1 are performed. A transmission type optical sensor 56 similar to that at work station B is arranged at work station E. The optical sensor 56 is provided for the purpose of checking when the chip-shaped electronic component 1 is attracted in a posture other than the normal posture, that is, in a standing position. Work station F
An XY table 57 on which the circuit board 2 is placed is arranged. Here, the vacuum suction device 21 presses the chip-shaped electronic component 1 onto the adhesive-applied portion of the circuit board 2. A parts collection box 58 is arranged at the work station H. If the optical sensor 56 determines that the component posture is abnormal, the vacuum suction device 21 carries the chip-shaped electronic component 1 to the work station H without descending from the work station F, and transfers the chip-shaped electronic component 1 to the component collection box 58. Part 1
drop. Work station I includes a nozzle switching device 59 that changes the turret angle of the vacuum suction device 21.
Place. Although not shown, the operating device for the vacuum switching valve 28 is connected to the work stations A, F, and H.
and switch between adsorption and non-adsorption according to the work sequence.

As mentioned above, the component position adjustment device 53 is arranged at the work stations C and D, and the types of the claws 55 are different for each station, so that one component position adjustment device can be used depending on the type of the chip-shaped electronic component 1. Assume that device 53 is selected. However, in both component position adjustment devices 53, the claws 55 are shaped like steps, and as shown in FIG. 12 and FIG. It's summery. That is, it is necessary to change the amount of descent of the vacuum suction device 21 depending on the size of the chip-shaped electronic component 1. It is also desired that the amount of descent of the vacuum suction device 21 at the work stations A and F be changed depending on the thickness of the chip-shaped electronic component 1. Furthermore, depending on the type of chip-shaped electronic component 1, that is, the fragility of the component, it may be necessary to change the movement mode of the vacuum suction device 21 itself. Therefore, the drive mechanism of the lifting device 39 is constructed as shown in FIGS. 1 to 10. This will be explained below.

Reference numeral 61 denotes a horizontally supported camshaft, to which first and second cams 62 and 63 are fixed at regular intervals. The first cam 62 is connected to the support member 37
The second cam 63 is for providing a large descending distance, and the second cam 63 is for providing a small descending distance. A cam follower shaft 64 is arranged parallel to the cam shaft 61, and supports lever-shaped first and second cam followers 65 and 66 so that they can swing independently from each other. The first cam follower 65 contacts the first cam 62 via a roller 67, and the second cam follower 66 contacts the second cam 63 via a roller 68. A link connecting member 71 is attached to the first cam follower 65 as a motion output section. The attachment position of the link connecting member 71 can be adjusted in the longitudinal direction of the first cam follower 65. Link connecting member 7
1 is connected to one end of a turnbuckle-type link 72. The other end of link 72 connects to rod 38. The rod 38 is pulled downward by the tension coil spring 73, which creates a force in the first cam follower 65 that forces the roller 67 against the cam 62. Although the second cam follower 66 brings the roller 68 into contact with the cam 63 only by gravity, a spring force may be applied to this. A stop bolt 74 is made to protrude downward from the tip of the first cam follower 65. The hit bolt 74 hits the stopper bolt 76 attached to the beam 75 that forms a part of the device frame 13, and the first cam follower 6
Limit the rotation of 5. The second cam follower 66 is also provided with a contact bolt 77 that corresponds to a stopper bolt 78 on the beam 75. Hit bolt 77
is the extension plate 7 fixed to the second cam follower 66.
It protrudes from the tip of 9. 81 is the cam shaft 6 facing the tip of the first cam follower 65.
1 is a cancell shaft supported in parallel with 1. The cancel shaft 81 has a cancel claw 8 that is engaged with the bolt 74 of the first cam follower 65.
Fix 2. In addition, a lever 83 is fixed to the cancel shaft 81 and connected to a rod 85 of a solenoid 84 by a link 86.
When the solenoid 84 is de-energized, the lever 83 is pulled downward by a tension coil spring 87, whereby the cancel shaft 81 places the cancel claw 82 in a position where it engages with the bolt 74.

91 is an actuator mounting bracket fixed to the first cam follower 65;
It has a shelf part 92 that overhangs above the shelf part 9.
An actuator 93 is attached to 2. The actuator 93 is comprised of a pneumatic cylinder, and its rod 94 extends toward a contact bolt 95 attached to the upper surface of the tip of the second cam follower 66.

In the state shown in FIGS. 3 and 4, the actuator 93 does not allow the rod 94 to reach the bolt 95, and the first cam follower 65 rotates independently of the second cam follower 66. Of course, in the illustrated state, the cancel claw 82 stops the rotation of the first cam follower 65, and the height of the support member 37 does not change no matter how much the first cam 62 rotates. That is, the upper surface of the support member 37 maintains a distance of H ₁ from the device frame 13. This is done when the vacuum suction device 21 is not lowered at work stations A, C, D, and F. When the solenoid 84 is energized and the cancel claw 82 is removed from the abutment bolt 74 as shown in FIG. Start. At the lower end of the lifting stroke, the upper surface of the support member 37 is separated from the device frame 13 by a distance H ² . This is the distance when the lower positioning portion of the claw 55 is used in the component position adjustment device 53 (FIG. 13). Note that the second cam follower 66 is different from the first cam follower 6.
5 continues to swing according to the second cam 63.

Next, operate the actuator 93 to remove the rod 9.
4, the rod 94 reaches the bolt 95 of the second cam follower 66, and the first cam follower 65 becomes supported by the second cam follower 66. As shown in Figures 7 and 8,
When the first and second cams 62 and 63 have lifted the first and second cam followers 65 and 66 to the highest level, the first cam 62 has lifted the first and second cam followers 65 and 66 to the highest level.
5 and the height at which the second cam 63 should contact the first cam follower 65 are both equal,
The support member 37 approaches the device frame 13 at a distance of H ¹ . If the solenoid 84 is de-energized,
The cancel claw 82 engages with the contact bolt 74,
The distance H ¹ remains the same. Cancel claw 8
2 is removed, the first cam follower 65 riding on the second cam follower 66 moves according to the second cam 63. The second cam 63 does not lower the support member 37 as much as the first cam 62, and as shown in FIG.
The support member 37 is separated from the device frame 13 by a distance H ³ which is less than H ² . At this time, the first cam 6
2 has separated from the roller 67. ^H3 is
This is the distance when the positioning section above the claw 55 is used in the component position adjustment device 53 (FIG. 12).

In this embodiment, the actuator 93 is arranged on the first cam follower 65 to push down the second cam follower 66, but it is also possible to move the actuator 93 to the second cam follower 66 and push up the first cam follower 65. The purpose can also be achieved by placing an actuator that pushes the other cam follower on either or both cam followers.

(G) Effects of the Invention According to the present invention, it is possible to selectively use the first and second cams attached to a single camshaft, select the stroke and cam curve, and provide various motions to the mechanical elements. can give.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a partially cutaway perspective view showing the main components of the cam movement switching device, Fig. 2 is a top view thereof, and Fig. 3 is a specific setting. Figure 4 is a cross-sectional view of another part under the same operating conditions as Figure 3, and Figure 5 is a cross-sectional view showing the operating status at a specific point in time under the same conditions as Figure 3. A sectional view showing the operating situation, FIG. 6 is in the same operating situation as FIG. 5,
7 is a cross-sectional view showing the operating situation at a specific time under setting conditions different from those in Figs. 3 to 6, and Fig. 8 is in the same operating situation as Fig. 7. 9 is a sectional view showing operating conditions at different times under the same setting conditions as in FIG. 7; FIG. 10 is a sectional view at another location under the same operating conditions as in FIG. 9; FIG. 11 is a partial cross-sectional view of a chip component mounting device whose operation is controlled by a cam movement switching device, and FIGS. 12 and 13.
FIG. 14 is a schematic side view for explaining the positioning operation of chip-shaped electronic components, and FIG. 14 is a developed view for explaining the operation of the chip component mounting device at each work station. 61...Camshaft, 62...First cam, 63...Second cam
cam, 65...first cam follower, 66...second cam follower
cam follower, 71... link connecting member (movement output part), 93... actuator.

Claims (1)

[Claims] 1. A cam movement switching device having the following configuration. (a) first and second cams arranged in parallel on a common camshaft; (b) a first cam follower in contact with the first cam; A second cam follower that comes into contact (c) A cam movement output section provided on the first cam follower (d) A cam movement output section provided on one or both of the first or second cam follower, and which is provided on one or both of the first and second cam followers and moves the first cam follower by pushing the other cam follower. An actuator that causes a second cam follower to support the actuator, and provides a movement based on the movement of the second cam follower to the first cam follower.