JPH01307562A - Device for switching over cam movement - Google Patents

Abstract

PURPOSE:To properly use cams and select strokes by providing first and second cams side by side on a common cam shaft, providing a cam movement output portion on a first cam follower and providing an actuator for pushing the opponent cam follower as necessary on the first cam follower. CONSTITUTION:First and second cams 62, 63 are provided side by side on a common cam shaft 61 and cam followers 65, 66 are brought into contact with same respectively. A link linking member 71 for transmitting movement is installed on the first cam follower 65 to lift up/down a supporting member 37 by the rotation of the first cam 62. An actuator 93 is installed on the first cam follower 65 and, by lowering the rod 94 thereof, the second cam follower 66 is pushed down, to carry out the movement of the linking member 71 being interlocked with the second cam 63. Hence, the supporting member 37 is lifted up/down by the rotation of the second cam 63 while also changing the stroke.

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) Conventional technology 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, Japanese Patent Application Laid-open No. 57-89535 and 6
A device as described in Japanese Patent No. 2-85490 has 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. There is no need to do this, and it is not a desirable action. On the other hand, in the latter case, the width of the cyst lobe is adjusted by changing the fulcrum position of the lever using the 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 is not possible to 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.

B) Means for Solving the Problems In the present invention, the first and second cams are arranged side by side on a common cam carrier, and the first and second cam followers are brought into contact with each of them. The first cam follower is provided with a cam motion output.

One or both of the first and @2 cam followers is provided with an actuator that pushes the other cam follower as necessary.

(e) Operation 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 apparatus, and this will be explained below.

In FIGS. 11 to 14, [111 is a mounting unit 7, σ2 is a mounting unit] (111 is a rotary index table type support device that forms the main body). It is fixed to the lower end of the rotating shaft ++S supported perpendicularly to the portion U.

The rotating shaft (151 is supported on the device frame t131 and rotated intermittently in one direction by the t-index drive device αe, thereby causing the support device 0z to rotate intermittently in the horizontal plane.The rotating shaft (151 is hollow) The central cavity has a vacuum suction path (lη) that connects to a vacuum source (not shown). Obstructed by body (1).

(21) is the work station shown in Fig. 14 (to) ~ σ
) is a vacuum suction device that rotates around the Vacuum suction device (
A total of ten 2Ds are arranged at equal intervals around the outer circumference of the support device 0. Each vacuum suction device D is supported so as to be movable up and down on a bearing block fixed to a support device f121. In Fig. 11, two vertical rods lined up in a direction perpendicular to the plane of the paper slideably pass through the bearing block 2z, and there are connecting plates C at the upper and lower ends, respectively.
241 (251 is fixed. The lower connecting plate G supports the vacuum suction device (21). The vacuum suction device (21+
is a turret rotating around a horizontal axis.
A total of four suction nozzles are protruded at intervals.

The four suction nozzles are of different types. The vacuum suction device ff121+ is connected to the vacuum switching pulp installed on the bearing block 1221 by a vacuum hose (not shown), to the vacuum switching pulp (281 is also connected to a vacuum hose (not shown), and to the connection fitting 081). .

The space between the connecting plates is in the shape of rLJ, and on both sides of the vertically rising part, there is a roller uD facing the rotation center of the support part dt121, and a roller ■ facing the opposite direction. are installed respectively. Laura C
111(2) are both rotatable around the horizontal axis. Field is a device frame (1311'!: A fixed annular cam member, and the roller Ca1l engages with the cam surface on its outer periphery. In other words, the connecting plate C4), the connecting footing of the rod, and the vacuum suction device (211 The structure containing (to) is
The roller 3D suspends the cam member from the field, and as the support device (12+) rotates, it moves up and down following the undulations of the cam surface. In order to give the vacuum suction device a particularly large lifting stroke, the descending passage (to) of roller 6D is provided branching off from the cam surface (b).At this point, the support of roller COD is lost, but in its place , the roller field engages with the support member (2),
(instead of the rollers 311) plays the role of suspending the structure.

The support member Gffl is fixed to the lower end of the vertical rod,
A lifting device 139i is configured. The rod head is supported by a bearing fixed to the equipment frame (131). The roller (11), which has finished descending and has risen, then moves onto the cam surface (to) again as the supporting device (121 starts moving), and the other roller ω is The combination of the descending passage (to) and the elevating device (39;)
Provided at work station (2) 00 [F] (first
(See Figure 4). In addition, the roller C11l or the mouth should be placed on the cam surface (towards).
Or, in order to ensure contact with the support member (9), the rod 1
A tension coil spring is stretched between the four bracket members protruding horizontally from the top of 231 and the stay fixed to the support device u3, and the force of this spring moves the structure downward. Pull. The tension coil spring lock passes through a hole that passes vertically through the support device [121].

At the work stations (1) to σ], the vacuum suction device I211 performs the work as follows. At the work station, the vacuum suction device 21+ is attached to the parts supply tape 6.
A chip-shaped electronic component (11) is sucked up from D. A transmission type optical sensor (to) is arranged at the work station (2) to check whether the vacuum suction device U is picking up the chip-shaped electronic component (11). A component position adjustment device ω is arranged at the work station 00.

The component position adjustment device 0 is a rotary plate (b) that supports between the claws that clamp the chip-shaped electronic component (1).
Centering and angle determination of the chip-shaped component 11+ with respect to the vacuum suction device Qll are performed. A transmission type optical sensor similar to that of the work station [F]) is arranged at the work station ω. The optical sensor (2) is provided for the purpose of checking (n) when the chip-shaped electronic component il+ is attracted in a posture other than the normal posture, that is, in a standing position. Work station D has a circuit board (2
) is placed on an XY table 157).

Here, the vacuum suction device 11 presses chip-shaped electronic components (11) onto the adhesive-coated portions of the circuit board (21).A parts collection box is placed at the work station.The optical sensor ω detects the parts. If the posture is determined to be abnormal, the vacuum plate mounting*tan carries the chip-shaped electronic component (1) to work station 0 without descending from work station 0, and transfers the chip-shaped electronic component 111 to the parts collection box.
drop. The work station α) is equipped with a vacuum suction device I2.
A nozzle switching device for changing the turret angle of 11 is installed. Further, although not shown, a vacuum switching pulp @ operating device is placed at the work station ■[F]■, and switching between adsorption and non-adsorption is performed according to the work sequence.

As mentioned above, work station 00 has component position adjustment.
The device Ω is arranged, but the type of gap between the claws is different for each station, and the chip-shaped electronic components are placed in one part position depending on the type of l. Suppose that Q is selected. However, which part position regulation fi! T! Also in t63, the claw ■ has a stepped shape, 29, Figures 12 and 16.
As shown in the figure, the step part is used differently depending on the size of the chip-shaped component (11).In other words, the amount of descent of the vacuum suction device 111211 is changed depending on the size of the chip-shaped component (11). The need arises.
In the work station (2) [F] as well, it is desirable to change the amount of descent of the vacuum suction device Qυ depending on the thickness of the chip-shaped electronic component +11. Furthermore, depending on the type of the chip-shaped component 11), that is, the fragility of the component, it may be necessary to change the movement mode of the vacuum suction device +211. Therefore, the drive mechanism of the lifting device $ is constructed as shown in FIGS. 1 to 10. This will be explained below.

: 6υ is a horizontally supported camshaft, on which the first and second cams (-) are fixed at regular intervals. The second cam 1631 is intended to provide a very small descending distance.

164+ is a cam follower shaft arranged parallel to the cam shaft 6D, and lever-shaped first and second cam followers 6Q@
are supported so that they can swing independently of each other.

The first cam 7 follower contacts the first cam iz via the roller I6, and the second cam follower contacts the second cam 1 via the roller I19. (3).The first cam follower 1r4 is equipped with a link connecting member ryt+ as a motion output part.The link connecting member ryt+ adjusts its mounting position in the longitudinal direction of the first cam follower 6f9. One end of a turnbuckle type link qz is connected to the link connecting member row.The other end between the links is connected to a rod.

The rod is pulled downward by the tension coil spring σ3), which generates a force in the first cam follower that presses the roller against the cam. The second cam follower (G) uses gravity alone to bring the roller shaft into contact with the cam (H), but a spring force may also be applied to this. At the tip of the second cam follower (A), there is a contact bolt ( 2) protrudes downward.The hitting cupole 1141 hits the beam (stopper pole attached to the electric) rlQ that forms part of the device frame (13+), and the first cam follower, (
Limit rotation of the lake. Second cam follower: Also in 6Q,
A stopper bolt (hitting pole corresponding to 7□□□) 17η is provided on the beam 1. The contact bolt (7η is an extension plate 79 fixed to the second cam follower side) protrudes from the tip. δl) is: JI, 1 cam follower 1 (to)
This is a cancel shaft supported parallel to the cam shaft 6υ so as to face the tip of the cam shaft. Between the cancel shafts, there is a cancel claw that is combined with the first cam follower (6 to 5 revolvers) +741! Fix the drink. In addition to this, fix this lever to the lever dt-cancel shaft, and connect this lever to the solenoid diagram) rod (linked to 851 v6)
Connect with. When the solenoid 1841 is de-energized, the lever is pulled downward by a tension coil spring, thereby placing the cancel shaft (81) in a position where the cancel claws (8 claws) engage with the bolt (741).

0υ is an actuator mounting bracket fixed to the first cam follower (-), which has a shelf (A) projecting above the second cam follower ((-), and the actuator (T) is attached to this shelf. The actuator (actuator is from a pneumatic cylinder), and its rod (b) extends toward the abutment Bordeaux attached to the upper surface of the tip on the second cam follower side.

In the state shown in Figs. 6 and 4, the actuator does not allow the rod to reach the contact bolt (to), and the first cam follower (to) rotates independently of the second cam follower (to). However, in the illustrated state, the cancel claw (2) stops the rotation of the first cam follower 1, and no matter how much the first cam 162+ rotates, the support member ((7)
The height of remains unchanged. That is, the upper surface of the support member εm maintains a distance Hl from the device frame αJ.

Vacuum suction device 1 at work station ■00 [F]
Do this when you do not want to lower the 211. When the solenoid diagram is energized and the cancel claw 8z is removed from the hit port H741 as shown in Figure 5, the first cam follower (to) will rotate according to the first cam ■, and the support member (support member) will rotate. ) starts moving up and down. Lower end of lifting stroke,
The upper surface of the support member (support) is at a distance of 4H from the device frame (13).
2*Reru. This is the distance when the positioning part below the claw (to) is used in the component positioning device (FIG. 13). Note that the second cam follower side continues to swing according to the second cam regardless of the movement of the first cam follower.

Next, when the actuator is operated to move the rod forward, the rod reaches the second cam follower, and the first cam follower and the second cam follower move forward. Become a supported shape.

As shown in FIGS. 7 and 8, 'fj1 and the second cam.
When the first cam (6) is raised to the highest level, the support member G (71 is close to the distance Hl from the device frame (131).If the solenoid (874J is de-energized), the cancel claw (Sibold cy that 8no won)
, and the distance H1 remains the same. When the cancel claw・,8 is removed, the first cam follower VGl19 on the @2 cam follower (to) is connected to the second cam (63
Move according to 1. The second cam gate does not lower the support member (support) as much as the first cam 621, and as shown in FIG. It does not move away from the device frame α3. At this time, the first cam force has been removed from the roller ((B). The distance is shown in Figure 12).

Note that in this embodiment, the actuator is placed on the first cam follower ((to)) and the actuator is placed on the second cam follower.
However, the second cam follower 161
The purpose can be achieved by moving the actuator to the cam follower 19 and pushing up the first cam follower side, or by disposing actuators that push the other cam followers on 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, and to select the stroke and cam curve. It can give you good exercise.

[Brief explanation of the drawing]

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. 6 is a specific setting. Figure 4 is a cross-sectional view showing the operating situation at a specific time in the lower part of the outside, Figure 4 is a cross-sectional view of another part in the same operating situation as Figure 5, and Figure 5 is a cross-sectional view showing the same operating situation as Figure 5. Cross-sectional views showing operating conditions at different times; Figure 6 is a cross-sectional view of other parts under the same operational status as Figure 5; Figure @7 is drawn under different setting conditions from Figures 6 to 6. Figure 8 is a front view of other parts under the same operating condition as Figure 7. Figure @9 is the operating status at a different time under the same setting conditions as Figure 7. Fig. 10 is a sectional view of another part in the same operating condition as Fig. 9.
FIG. 1 is a partial sectional view of a chip component mounting device whose operation is controlled by a cam movement switching device, FIGS. 12 and 15 are schematic side views illustrating the positioning operation of a chip-shaped electronic component, and FIG. FIG. 3 is an exploded view illustrating the operation of the chip component mounting device at each work station.・611...Cam shaft, +62...First cam, ・
631...Second cam, (60...First cam follower, Side...Second cam follower, 'ff1l...
・Link connecting member (movement output part), -...actuator. Person: Sanyo Denshin Co., Ltd. Representative Patent Attorney Futsugu Nishino (1 other person) Figure 1 Figure 9 Figure n Figure ρ

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; (c) a cam movement output portion provided on the first cam follower; (d) a cam movement output portion provided on one or both of the first or second cam followers, the second cam follower being in contact with the second cam follower;
cam follower is supported by the second cam follower, and the second cam follower is supported by the second cam follower.
an actuator that provides movement to the first cam follower based on movement of the cam follower;