JP2591642Y2 - Cam drive mechanism clutch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for selectively locking a cam lever for driving a driven body by engaging and swinging with a cam by rotating the cam. The present invention relates to a clutch device of a cam drive mechanism having a locking lever that locks the cam lever by swinging about a fixed support shaft.

[0002]

2. Description of the Related Art A clutch device of a cam drive mechanism is disclosed in Japanese Patent Application Laid-Open No. Hei 4-167599. A cam lever which engages with a cam via a cam follower swings by rotation of the cam. When the head does not take out the electronic component, the suction head attached to the head is moved up and down to take out the electronic component. When the head does not take out the electronic component, one end of the contact lever that swings by driving (demagnetizing) the clutch solenoid. The swinging movement of the cam lever is restricted by moving below the cam lever and supporting the cam lever, thereby preventing the suction head from being lowered.

However, when the contact lever is swung by the drive of the clutch solenoid to bring the cam lever into a supportable state, the cam lever is supported by the largest outer diameter portion of the cam (ie, the suction head). Is the highest point)
Then, the solenoid is driven and the contact lever swings, so that the driving force of the solenoid is not so large. Therefore, a gap is opened between one end of the lever and the cam lever, and the lever enters under the cam lever in a state where there is no resistance. Then, when the cam rotates, the diameter of the cam decreases, and the cam lever descends, but the contact lever contacts the cam lever and supports it so that the suction head does not descend. At this time, the cam head is attached to the cam lever from the cam surface The cam follower separates, but the rotation of the cam causes the cam surface of the large diameter portion of the cam to collide with the cam follower. If this collision is repeated every time the cam rotates, the cam and the cam follower may be damaged. .

As a clutch device for locking the cam lever, an air cylinder may be used to push the cam lever above the maximum diameter portion of the cam by a rod of the cylinder, but a large force is required. There are drawbacks.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to switch the clutch of a cam drive mechanism so that a collision between a cam and a portion engaged with the cam does not occur.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is to selectively lock a cam lever that drives a driven body by engaging with the cam and swinging by rotating the cam.
In a clutch device of a cam drive mechanism having a locking lever that locks the cam lever by swinging a fixed support shaft around a fulcrum by driving of the driving means, the locking lever is supported by the cam by the cam lever. The cam lever is formed such that the contact surface of the cam lever with which the locking lever comes into contact with the cam lever is inclined with respect to the traveling direction of the locking lever so as to raise the cam lever.

[0007]

When the driving means is driven in order to restrict the swing of the cam lever, the locking lever swings and comes into contact with the contact surface of the cam lever, and as the locking lever advances, the driving force of the driving means becomes larger. Works on the inclined contact surface to lift and support the cam lever.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 2 and 3, (1) is a Y table that moves in the Y direction by rotation of a Y-axis motor (2), and (3) is a Y table (Y) that is rotated by an X-axis motor (4). 1) An XY table that moves in the X and Y directions as a result of moving in the X direction, and is a printed circuit board (6) on which chip-shaped electronic components (5) (hereinafter, referred to as chip components or components) are mounted. Are fixed and mounted on fixing means (not shown).

[0009] (7) is a supply stand, chip components (5)
A large number of component supply devices (8) for supplying the components are provided. (9) is a supply stand drive motor, which is a ball screw (1).
By rotating (0), the supply table (7) is guided by the linear guide (12) via the nut (11) fitted with the ball screw (10) and fixed to the supply table (7). Move in X direction. (13) is a rotary table which rotates intermittently. At the outer edge of the table (13), mounting heads (15) having six suction nozzles (14) are arranged at regular intervals according to the intermittent pitch. I have.

The stop position of the mounting head (15) where the suction nozzle (14) sucks and picks up the component (5) from the supply device (8) (the position indicated by the black circle in FIG. 2) is the suction station (I). The suction nozzle (1) is moved down by the mounting head (15) at the suction station (I).
4) sucks the part (5). (II) is a case where the mounting head (15) sucking the component (5) is rotated by the rotary table (1).
3) A recognition station that stops due to intermittent rotation. The component recognition device (16) recognizes the positional deviation of the component (5) with respect to the suction nozzle (14).

(III) is a mounting station (the black circle at the bottom in FIG. 2) where the mounting head (15) stops 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) stopped at a predetermined position by the movement of the XY table (3) due to the lowering of the mounting head (15).

The mounting head (15) is attached to a lower part of a head elevating shaft (18) which penetrates the rotary table (13) at two positions inside and outside so as to be able to move up and down. It is fixed to a U-shaped roller mount (19). Roller mounting body (19)
On the upper part of the upper cam follower (20) protruding inside
And the lower cam follower (21) is pivotably supported.

FIG. 3 shows a support 23 which supports the rotary table 13 so as to be rotatable in the horizontal direction below. A cylindrical cam (2) is provided around the support 23.
4) is formed. The cylindrical cam (24) is sandwiched between the upper cam follower (20) and the lower cam follower (21) by a spring (not shown), and the head (15) is supported by the cam (24) while the rotary table (1) is held.
It moves by the rotation of 3).

In the suction station (I) and the mounting station (III), the cam (24) is notched, and in the suction station (I), the rotary table (13) is intermittent. A cam follower (27) engaged with the cam (26) is attached by a cam (26) fixed and rotated by a cam shaft (25) rotated by an index motor (not shown) driven through a rotary index unit. The cam follower (20) arranged in a cutout portion of the above-mentioned cylindrical cam (24) by swinging the cam lever (28) according to the outer circumference having a different diameter depending on the position of the cam (26). The lower end is attached to the upper part of a vertical moving body (29) on which the (21) is supported, and the upper end is a rod (30) rotatably attached to the cam lever (28). There is up and down the mounting head (1
5) can be moved up and down for picking up parts. The outer side of the two-dot chain line concentric circle drawn around the cam shaft (25) in FIG. 1 is the locus of the largest diameter portion of the cam (26), the inner side is the locus of the smallest diameter portion, and the cam lever (28). ) Rocks during this time. In the raised position, the vertical moving body (29) moves from the cylindrical cam (24) to the cam follower (20) as shown in FIG.
(21) is at a height position where it can be transferred. Rod (30)
Is attached to one end of a tension spring (31), and the other end of the spring (31) is attached to a support base (2
3), and urges the rod (30) downward, so that the weight of the vertical moving body (29) is also applied, and the cam lever (28) is moved around the support shaft (32) in FIG. The cam follower (27) is urged to rotate counterclockwise.
Are always in contact with the cam (26). A cam drive mechanism is formed by the cam (26), the cam lever (28), and the like.

Next, the clutch mechanism of the cam drive mechanism will be described. 1 and FIGS. 3 to 5, (3)
4) is a suction type solenoid which pulls the rod (35) by excitation. When the solenoid (34) is in a demagnetized state, an engagement lever (36) rotatable around a support shaft (38) attached to a rod of the solenoid (34) is actuated by a tension spring (37) as shown in FIG. The rod (35) protrudes, and the lever (36) is moved by the cam lever (2).
The position is not restricted to the swing of 8). A cam follower (39) for engaging and supporting the cam lever (28) is rotatably provided at one end of the lever (36). When the solenoid (34) is excited, its rod is retracted, and the lever (36) swings counterclockwise in FIG. 3 so that the lever (28) can be brought into contact with the contact surface (40) formed on the lever (28). I have. The corresponding contact surface (40) is the cam (26)
When the cam follower (27) is in contact with the largest diameter portion of the rod (35) by the excitation of the solenoid (34).
Is retracted, the engagement lever (36) swings counterclockwise, and the cam follower (39) is brought into contact with the corresponding contact surface (4).
4), a large force can be generated in the direction of pushing up the cam lever (28) in the direction of pushing up the cam lever (28) when the abutment as shown in FIG. The inclination is formed so as to decrease as it goes to the right in the substantially horizontal direction in FIG. 1, which is the direction in which the force acts on the surface (40).

Reference numeral (44) denotes an up-down moving body provided at a position where the cylindrical cam (24) is cut out in the mounting station (III) so as to be able to move up and down. Similarly, the cam follower (46) and the cam lever (4) are supported by the cam (45) while supporting the mounting head (15).
7) and move up and down via the rod (48). Cam (4
6) and the cam lever (48) form a cam drive mechanism similar to the cam (26) and the cam lever (28). The cam (45) also rotates by the rotation of the index motor. Also, the solenoid (49) and the engagement lever (50), which pull the rod by excitation, form a clutch mechanism similar to that of the suction station (I).

(53) is a part of the chip component (5) which is built in the mounting head (15) and is rotated around the substantially center of the head (15) by rotating the suction nozzle (14). Angular positioning and suction nozzle (1
4) a driving power supply cord for transmitting a current from a driving circuit (not shown) for driving a pulse motor for selecting a nozzle by changing a position with respect to the mounting head (15); It is connected. (5
A vacuum tube 5) communicates with a vacuum source (not shown) for sucking the chip component (5) from the suction nozzle (14).

In FIG. 3, reference numeral (56) denotes an elevating lever which moves up and down to swing the swing lever (57) of the component supply device (8). The tape (not shown) wound in the reel is fed, and the chip component (5) stored in the tape is supplied to the suction position of the nozzle (14). The lifting lever (56) is a component supply device (8) for supplying the component (5) to the mounting head (15) stopped at the suction station (I).
Is provided at a position where the swing lever (57) can be swung.

The lifting lever (56) is moved up and down by a cam driving mechanism similar to the cam driving mechanism formed by the cam (26) for moving the mounting head (15) up and down and the cam lever (28). When the component (5) is not taken out, that is, when the mounting head (15) is not lowered, the tape feed for supplying the component (5) is not performed. A clutch mechanism similar to the clutch mechanism formed by the lever (36) and the like is provided.

The operation of the above configuration will be described below. By pressing the start key of the automatic operation of the operation unit (not shown), the component (5) is placed on the printed circuit board mounted on the XY table (3) according to the data designating the components to be mounted in the mounting order (not shown). The automatic mounting operation is started. The intermittent rotation of the rotary table (13) causes the suction nozzle (14) of a type corresponding to the chip component (5) to be sucked to rotate to a predetermined position, and the selected mounting head (15) is moved to the cylindrical cam. (24) The adsorption station is reached while being squeezed. The upper cam follower (20) and the lower cam follower (21) transfer to the vertical moving body (29) from the cylindrical cam (24).

In parallel with this, the component supply device (8) for supplying the chip component (5) to be sucked is moved to the component removal position by the movement of the supply table (7) by the rotation of the supply table drive motor (9). Come moved. At this time, since it is known that the component (5) is to be suctioned by the suction station, the CPU (not shown) demagnetizes the solenoid (34), and the rod (35) is a spring as shown in FIG. The engagement lever (36) is protruded by the bias of (37) and retracts to a position where it does not engage with the cam lever (28).

Accordingly, the rotation of the cam (26) by the rotation of the cam shaft (25) by the rotation of the index motor (not shown) causes the cam follower (27) to follow the cam surface as shown in FIG.
To the position shown by the two-dot chain line, and the cam lever (28) swings to the position shown by the two-dot chain line to move the rod (3).
0) is lowered, and the mounting head (15) is lowered with the lowering of the vertical moving body (29) to take out the chip component (5) supplied to the component supply device (8) by vacuum suction, and further cam (26). The cam follower (27) moves to the left by the cam surface of the large diameter portion due to the rotation of, and the mounting head (15) rises to reach the position in FIG. At this time, the lifting lever (5
6), the cam drive mechanism moves the lever (57) up and down to supply the chip component (5) to the take-out position by the suction nozzle (14).

Next, the rotary table (13) performs the next intermittent rotation from the stopped state, and the mounting head (15) sucking the component (5) is supported by the cam followers (20) and (21) on the cylindrical cam (24). Then, the head is moved to the next stop position, and the next head (15) is moved to the suction station. The mounting head (15) has some cause (for example, damage or clogging of the suction nozzle (14) to be used).
When the CPU is known to be in a state in which the chip part (5) is not sucked by the CPU, the cam lever (28) is supported by the largest diameter portion of the cam (26). (State shown by a solid line in FIG. 1)
During this time, the solenoid (34) is excited.

That is, the rod (35) is retracted quickly and responsively against the urging force of the spring (37), and the engagement lever (36) swings counterclockwise around the support shaft (38). At the position shown in FIG. 4, it comes into contact with the contact surface (40) of the cam lever (28). When the lever (36) further swings, the cam follower (39) acts as a wedge and the driving force of the solenoid (34) because the contact surface (40) is inclined downward toward the right side in FIG. Is about 10 kg (or more) against the contact surface (40).
, And moves to the right while pushing up the cam lever (28) against the tensile force of the spring (30) and the weight of the vertical moving body (29) and the mounting head (15). Stop and lock in the state of 5. At this time, as shown in an enlarged manner in FIG. 6, the cam follower (27) is in a state separated from the maximum diameter portion of the cam (26). The cam lever (28) is supported by the driving force by excitation of the solenoid (34) and the support shaft (38). Therefore,
The position of the support shaft (38) must be determined so that the cam follower (39) engaged with the cam lever (28) by excitation of the solenoid (34) can support and lock the cam lever (28).

Thus, even if the cam shaft (25) is rotated and the cam (26) is rotated, the cam (26) is kept in the cam follower (2).
There is no collision in 7). Next, the mounting head (15)
When the cam (26) reaches the maximum diameter portion again without lowering, the solenoid (34) is demagnetized and the engagement lever (36) swings in the retracting direction.
7) abuts the cam (26), and the rotary table (1)
The cam follower (20) (2)
1) is transferred from the vertical moving body (29) to the cylindrical cam (24), and the mounting head (15) moves to the next stop position.
When the mounting head (15) does not move down, the lifting lever (56) is not moved down by the operation of the clutch mechanism.

Next, the first mounting head (15) that has picked up the chip part (5) recognizes the displacement of the chip part (5) with respect to the suction nozzle (14) by the recognition device (16) at the recognition station. Is carried out, and angular positioning is performed by rotation of a motor built in the head (15). When the mounting station (III) is reached, the XY table (3) moves to a designated position and the mounting head is moved. (15)
The mounting of the chip component (5) on the printed circuit board (6) is performed by the downward movement. Also in this case, the solenoid (4
9) is a state where the cam lever (47) is demagnetized and the cam (4)
By swinging via the cam follower (46) by the rotation of 5), the vertical moving body (44) descends and the mounting head (15) descends.

Next, when the mounting head (15) from which the chip component (5) has not been sucked reaches the mounting station, the solenoid (49) is operated in the same manner as in the suction station.
Are excited and are supported by the engagement lever (50) so that the cam lever (47) does not come into contact with the cam (45). In the mounting station, even if the mounting head (15) sucks the chip component (5) in the suction station, a component presence / absence detecting device or a recognizing device (1) (not shown) thereafter.
Even if it is detected by 6) that the suction nozzle (14) does not suck the chip component (5), or if the suction nozzle (14) sucks the chip component (5) in a posture where it cannot be mounted, the solenoid prevents the mounting head (15) from descending. The excitation of (49) is performed.

One intermittent rotation of the rotary table (13), that is, from when one mounting head (15) stops at the suction station to when the next mounting head (15) stops at that station. The time can be very short, on the order of 0.15 seconds or faster, and the solenoid (34) (4
9) works well for this speed. In this embodiment, the solenoid (34) is excited to pull the rod (35) and swing the lever (36) by the driving force. However, when the solenoid is excited and the rod is projected, the solenoid (34) is used. The cam lever may be supported by swinging the lever corresponding to the lever (36). In both solenoid types, the lever corresponding to the lever (36) is swung by the force of the spring when demagnetized. In this case, the cam lever may be supported. Further, as a driving means for driving the engagement lever (36) as a locking lever, an air cylinder or the like may be used without using the solenoid (34).

[0029]

As described above, according to the present invention, since the locking lever lifts and supports the cam lever, it is possible to support the cam lever at a distance from the maximum diameter portion of the cam.
Since the collision between the cam and the cam lever can be prevented, the life of the cam drive system can be extended.

[Brief description of the drawings]

FIG. 1 is a side view showing a clutch mechanism of a cam drive mechanism of the present invention.

FIG. 2 is a plan view of an electronic component automatic mounting apparatus to which the present invention is applied.

FIG. 3 is a side view of the electronic component automatic mounting apparatus to which the present invention is applied.

FIG. 4 is a side view showing the clutch mechanism of the cam drive mechanism of the present invention.

FIG. 5 is a side view showing the clutch mechanism of the cam drive mechanism of the present invention.

FIG. 6 is an enlarged side view showing a state where a gap is formed between a cam and a cam follower.

[Explanation of symbols]

 (26) Cam (28) Cam lever (29) Vertically moving body (driven body) (34) Solenoid (36) Engaging lever (locking lever) (40) Contact surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A fixed support shaft is supported by a driving means to drive a driven member by selectively engaging a cam lever which is driven by being engaged with the cam and pivoted by the rotation of the cam. In a clutch device of a cam drive mechanism having a locking lever that rocks and locks the cam lever, when the locking lever abuts on the cam lever while being supported by the cam, the locking lever of the cam lever is A clutch device for a cam drive mechanism, wherein a contact surface to be contacted is inclined with respect to a traveling direction of a locking lever so as to raise the cam lever.