JP2992390B2 - Electronic component mounting head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mounting head provided in an electronic component automatic mounting apparatus for holding and mounting an electronic component on a printed circuit board. The present invention relates to an electronic component mounting head that returns a mounting spindle to a raised position and holds the mounted spindle at the raised position.

[0002]

2. Description of the Related Art In an electronic component automatic mounting apparatus, an electronic component is held from an electronic component automatic supply device such as a tape feeder or a multi-stage tray feeder for supplying the electronic component and is moved onto a printed circuit board. An electronic component mounting head to be mounted is provided. In such a mounting head, a mounting spindle having a chuck for holding an electronic component at a tip is configured to rise by rotation of a cam lever at a peak of a cam, and to be lowered by a biasing force of a spring at a valley of the cam. There is something.

In such a mounting spindle, if the power is turned off due to some trouble during the operation, the driving shaft of the motor for driving the cam stops,
Depending on the position of the cam, in order to stop at the position where the mounting spindle is kept lowered, when restarting, such a mounting head is lifted and manually moved to return to the original position.

However, when the mounting head is moved in this manual, if the mounting head is not noticed that the mounting spindle is lowered, or the mounting head is moved overlooking,
Small and precise components such as chucks attached to the tip of the mounting spindle may interfere with mounted electronic components, electronic component automatic supply devices, or other components. As a result, an accident such as breakage or deformation of a small and precise component such as a chuck may be caused.

The present invention has been made in view of such circumstances, and when the power is turned off, the mounting spindle is returned to the raised position and held at that position to prevent the above-described accident and to prevent the chuck from being damaged. It is an object of the present invention to provide an electronic component mounting head capable of protecting small and precise components such as the above.

[0006]

In order to achieve this object, an electronic component mounting head according to the present invention is provided in an electronic component automatic mounting apparatus, and is used for holding an electronic component and mounting it on a printed board. In the component mounting head, a mounting spindle that is attached to the mounting head body so as to be able to move up and down, holds the electronic component and mounts the electronic component on a printed circuit board, one end of which engages with the mounting spindle, and the other end of which is connected to the cam via a cam follower A first cam lever that rotates and raises and lowers the mounting spindle by rotating the mounting spindle; a spring that urges the first cam lever in a direction that lowers the mounting spindle; The first cam lever is rotated by the biasing force of the spring to lower the mounting spindle at the valley of the cam which rotates the first cam lever to raise the mounting spindle. A mounting spindle raising / lowering cam for controlling the drive so as to cause the power to be turned off, a switching means for switching a circuit when the power is turned off, and operating by switching the switching means, moving the first cam lever away from the cam in a direction to raise the mounting spindle. And a first actuator for rotating the first actuator and an auxiliary power source for driving the first actuator.

[0007]

According to the present invention constructed as described above, the power supply O
When the switching means for switching the circuit at the time of FF is activated, the first actuator driven by the auxiliary power source rotates the cam lever against the urging force of the spring, and raises the mounting spindle to hold it at the raised position. Therefore, even when the mounting head is manually moved to return to the home position when restarting, the mounting spindle is in the raised position, and small and precise parts such as the chuck at the tip of the mounting spindle are already mounted. It does not interfere with the electronic components, the electronic component automatic supply device, or other components, and does not cause an accident such as breakage or deformation of such small and precise components.

Further, according to the present invention, the OF of the power supply is
When the switching means is operated at the time of F, the second actuator is operated, and the first regulating pin prevents the rotation of the cam lever, thereby reliably preventing the mounting spindle from lowering. Therefore, even if the power is turned off for a long time and the power of the auxiliary power source for driving the first actuator is reduced, the mounted spindle that has been once raised does not lower.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic component mounting head according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view of an electronic component mounting head according to an embodiment of the present invention. The left end view shows a state where a centering claw is closed, and the center and right end views show that a centering claw is open. Indicates a state in which FIG. 2 is a left side sectional view of the electronic component mounting head shown in FIG. 1, in a state where a mounting spindle is raised and a centering claw is opened. FIG. 3 is a left side sectional view of the electronic component mounting head shown in FIG. 1, in a state where the mounting spindle is lowered. FIG. 4 is a left side sectional view of the electronic component mounting head shown in FIG. 1 when the mounting spindle is raised when the power is turned off.

In the electronic component mounting head 1 according to the present embodiment, the protruding portion 1 protruding forward from the mounting head body 1a.
In FIG. 0, three head driving units 4 each having a nozzle 2 as a vacuum chuck for adsorbing an electronic component and mounting the electronic component on a printed circuit board 17 and a centering claw 3 for correcting the attitude of the electronic component are provided. . Since these three head drive units 4 have the same configuration, only one head drive unit 4 at the left end will be described.

As shown in FIG. 1, a cylindrical first sleeve 1 is provided on a protrusion 10 projecting from the mounting head 1 to the front side.
A cylindrical second sleeve 12 is provided below the sleeve 11 so as to be rotatable integrally therewith.
Under the second sleeve 12, the head drive unit 4
Is provided. These first and second sleeves 1
A mounting spindle 15 is supported inside the insides 1 and 12 via bushes 13 and 14 so as to be able to move up and down. At the lower end of the mounting spindle 15, a nozzle 2 for sucking the electronic component W is fixed via an intake path (not shown) formed through the center of the mounting spindle 15. A vacuum hose 19 is connected to an upper end of the mounting spindle 15 via a connector 18 and is connected to a vacuum source (not shown).

As shown in FIG. 2, a concave member 16 is provided at the upper end of the mounting spindle 15, and this concave member 16 is provided.
In addition, the first cam lever 20 formed in a substantially "F" shape
Is engaged with a roller 21 provided at one end. An intermediate portion of the first cam lever 20 is rotatably supported by a shaft 22, and a cam follower 23 is provided at the other end of the first cam lever 20. One end of a spring 24 is locked to a further end of the cam follower 23 on the other end side of the cam lever 20, and the other end of the spring 24 is locked to a stop member 25 provided on the mounting head main body 1a. As a result, the other end of the first cam lever 20 is constantly urged in the direction in which the mounting spindle 15 descends, and the cam follower 23 of the first cam lever 20 contacts the mounting spindle elevating cam 30 which is rotated by a motor (not shown). In contact.

This lifting mechanism operates as follows. When the mounting spindle 15 is lowered, the mounting spindle elevating cam 30 is rotated, and when the valley 30b of the cam comes to the position of the cam follower 23, the first cam lever 20 is rotated clockwise by the tension urging force of the spring 24. To rotate. As a result, the roller 21 at the tip of the first cam lever 24 descends, and the concave member 16 engaged with the roller 21 is pushed down to lower the mounting spindle 15 and the nozzle 2.

When the mounting spindle 15 is lifted, the mounting spindle elevating cam 30 rotates to rotate the cam peak 30a.
Presses the cam follower 23, and the first cam lever 20 rotates counterclockwise against the urging force of the spring 24. Thereby, the roller 21 at the tip of the cam lever 24
Rises, the concave member 16 engaging with it is lifted, and the mounting spindle 15 and the nozzle 2 rise.

FIG. 2 shows a state before the nozzle 2 sucks the electronic component, and the centering claw 3 is in an open state. FIG. 3 shows a state in which the nozzle 2 is lowered to suck the electronic component, and also at this time, the centering claw 3 is in an open state.

In this embodiment, as shown in FIG. 4, a safe mechanism for returning the mounting spindle 15 to the raised position and holding it when the power is turned off is provided. As the safe mechanism, a projection 26 extending outward from the center is formed on the first cam lever 20, a roller 27 is provided, and the projection is formed by a pressing shaft 43 provided at the tip of a piston rod 42. 26 to the first cam lever 20
The first air cylinder 41 is provided as a first actuator for rotating the counterclockwise direction (that is, the ascending direction of the mounting spindle 15).

Further, as shown in FIG. 4, the first cam lever 20 is provided with a projection 28 at the lower end on the front side of the shaft 22. The first regulating pin 50 for regulating the rotation is
1 is swingably supported. This first regulating pin 5
0 is formed in a substantially “F” shape as shown in FIG.
One end of the first regulating pin 50 is engaged with the lower end of an operating shaft 45 fixed to a piston rod 46 of a second air cylinder 44 as a second actuator, and the other end of the operating shaft 45 is It has an adjusting screw 52 that comes into contact with the first cam lever 20 and adjusts the amount of restriction. Therefore, when the operating shaft 45 is lowered together with the piston rod 46 of the second air cylinder 44, the operation shaft 45 shown in FIG.
As shown in (1), the first regulating pin 50 is swung clockwise, and the adjusting screw 52 comes into contact with the projection 27 to rotate the first cam lever 20 clockwise (that is, the lowering of the mounting spindle 15). (Rotation in the direction).

The first and second air cylinders 41,
As shown in FIG. 4, a pneumatic circuit having an electromagnetic valve 61 serving as a circuit switching means is connected to 44, and is connected to an accumulator 62 which is an auxiliary power source which is not directly related to power-off. This solenoid valve 61 turns on the power of the automatic mounting device.
Sometimes it is always ON, and the air cylinders 41, 44
A circuit is formed so as to retract the piston rods 42 and 46 of FIG. On the other hand, when the power is turned off, the power of the solenoid valve 61 is also turned off as shown in FIG. 4, so that the circuit is switched and the first power is supplied from the accumulator 62 which is the auxiliary power source.
And air is supplied to the second air cylinders 41 and 44,
Push shaft 43, working shaft 4 together with piston rods 42, 46
5 is lowered.

The safe mechanism configured as described above operates as follows. When the power is turned on, the air cylinders 41, 4
The fourth pistons 42 and 46 are retracted, the first cam lever 20 is rotated only by the action of the cam 30 and the spring 24, and the mounting spindle 15 is moved up and down to perform the normal mounting operation of the electronic components.

When the power is turned off due to some trouble, the solenoid valve 61 is turned off and the pneumatic circuit is switched even if the mounting spindle 15 is stopped in a lowered state as shown in FIG. The piston rods 42, 46 of the second air cylinders 41, 44 descend. Thus, the pressing shaft 43 of the first air cylinder 41 presses the protruding portion 26 of the first cam lever 20 downward via the roller 27, and the first cam lever 20 resists the urging force of the spring 24. Counterclockwise, and as a result, the mounting spindle 15 is raised. At the same time, the operating shaft 45 of the second air cylinder 44 is also lowered, and the first regulating pin 50 swings, so that the first cam lever 20 rotates clockwise as shown in FIG. Motion (ie, mounting spindle 1
5 is prevented from rotating (downward rotation), whereby the mounting spindle 15 is locked in the raised position.

As described above, the operation of the first air cylinder 41 returns the lowered mounting spindle 15 to the ascending position, so that when restarting, the mounting head 4 is manually moved to return to the home position. Also, the mounting spindle 15 is in the raised position, and small and precise components such as the nozzle 2 at the tip of the mounting spindle 15 do not interfere with the mounted electronic components or the electronic component automatic supply device or other components, An accident such as breakage or deformation of such a small and precise part does not occur.

Further, the lowering of the second air cylinder 44 causes the first regulating pin 50 to prevent the rotation of the cam lever 20 and the lowering of the mounting spindle 15 without fail. And accumulator 62
Even if the internal pressure decreases, the mounting spindle 1
5 does not fall.

Next, a driving mechanism of the centering claw will be described with reference to FIGS. Centering claw 3
Is formed in a substantially “L” shape, the center of which is swingably supported by a pivot 71, and the upper end thereof has an arc-shaped contact portion 7.
2 are formed. A torsion spring (not shown) is mounted on the pivot 71, whereby the centering claw 3 is constantly urged to open. A pressing member 73 that comes into contact with the contact portion 72 of the centering claw 3 is provided so as to be slidable in the vertical direction.
, A tubular member 74 that is slidable in the vertical direction is provided. A spring 76 is interposed between the flange 75 of the tubular member 74 and the upper surface of the pressing member 73.
The flange portion 75 of the cylindrical member 74 protrudes outward in a ring shape, and the lower end portion of a concave member 78 provided at the upper and lower ends of a rod 77 slidable up and down is engaged with the ring portion. I have. On the other hand, the pin 81 at one end of the second cam lever 80 is engaged with the concave member 78 provided at the upper end of the rod 77. The second cam lever 80 is formed in a substantially "F" shape, and the center thereof is swingably supported. The other end of the second cam lever 80 has a cam follower 82
A centering claw opening / closing cam 85 for allowing the cam follower 82 to swing the cam lever 80 is tensioned by a spring 83 at the other end of the cam 85.
It is provided so that it may be pressed.

The driving mechanism of the centering claw thus configured operates as follows. As shown in FIG. 7, when the centering claw 3 is closed,
When the cam valley 85 b comes to the position of the cam follower 82, the second cam lever 80 rotates counterclockwise by the urging force of the spring 83. As a result, the rod 77 lowers the cylindrical member 74 engaged with the concave member 78 at the lower end at the flange 75. As a result, the spring 76 is compressed to urge the pressing member 73, and this urging force is applied to the pivot 7.
When the urging force is larger than the urging force of a not-shown torsion spring provided in 1, the contacting portion of the centering claw 3 is pushed down by the pressing member 73, and the centering claw 3 rotates in the closing direction.

Further, in this embodiment, the centering claw 3 is opened (that is, the pin 8 of the second cam lever 80 is opened).
A mechanism that can be locked in a state where the first part is raised) is provided.

As the mechanism, the second cam lever 80
Also has a protruding portion 89 like the first cam lever 20,
When the power is turned off, the lowering of the piston rod 42 and the pressing shaft 43 of the same first air cylinder 41 causes the second cam lever 80 to rotate clockwise, pulling up the rod 77, and forcing the centering claw 3 to move. It is configured to be opened. Further, the second regulating pin 90
Are swingably supported by a pivot 91, as shown in FIG.
The second regulating pin 90 is formed substantially symmetrically with the first regulating pin 50, and one end is engaged with the operating shaft 46 of the second air cylinder 44, similarly to the first regulating pin 50, The other end has an adjustment screw 92 that contacts a projection 86 provided at the lower end of the second cam lever 80 and adjusts the amount of restriction of the second cam lever 80. Therefore, when the operating shaft 45 of the second air cylinder 44 is lowered, as shown in FIG. 5, the second regulating pin 90 swings counterclockwise, and the adjusting screw 92 comes into contact with the projection 86. Thus, the second cam lever 80 is inserted at a position that prevents the counterclockwise rotation of the second cam lever 80 (that is, the rotation in the direction in which the centering claw 3 closes).

During normal operation, that is, when the power is on, as shown in FIG. 6, the first and second actuators 41 and 44 are in the raised position, and the second regulating pin 90 is Although the cam lever 80 is at a position where the rotation of the cam lever 80 is permitted, when the power is turned off, the electromagnetic valve 61 is switched as shown in FIG. 4 and the piston rod 42 and the pressing shaft 43 of the first air cylinder 41 are lowered. Then, the second cam lever 80 rotates clockwise, the rod 77 is pulled up, and the centering claw 3 is forcibly opened.
At the same time, the operating shaft 45 of the second actuator 44 descends, whereby the second regulating pin 90 swings counterclockwise at the same time as the first regulating pin 50, and the second cam lever 80 Rotation in the counterclockwise direction (that is, rotation in the direction in which the centering claw 3 closes) is prevented, and the centering claw 3 is locked in an open state.

As described above, in the present invention, when the power is turned off, the mounting spindle 15 is securely locked at the raised position and the centering claw 3 is securely locked in the open state. And the nozzle 2) and the centering claw 3 can be locked together in the initial position. Since each of the three head driving units 4 is provided with these locking mechanisms, only one of the three head driving units 4 is selected to operate the mounting spindle 15 and the centering claw 3. While the mounting spindle 15 and the centering claw 3 of the other two head driving units 4 are not operated.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified. For example,
Although the cam levers 20 and 80 are rotated to the initial position and the driving source locked by the restriction pins 50 and 90 is described as pneumatic,
Even if this is hydraulically used, or a backup power supply is used as an auxiliary drive source using an electromagnet or the like as an actuator, the same can be achieved.

The term “mounting” does not only mean mounting a surface mount type electronic component, but also includes mounting a lead wire of an electronic component into an insertion hole of a printed circuit board. Of course.

[0032]

As described above, according to the present invention, when the circuit is switched by the switching means when the power is turned off,
The first actuator can rotate the cam lever against the urging force of the spring to raise the mounting spindle and hold the mounting spindle at the raised position. Therefore, when restarting, even if the mounting head is moved manually to return to the home position, the mounting spindle is in the raised position, and small and precise parts such as the nozzle at the tip of the mounting spindle are already mounted. It does not interfere with the electronic component, the electronic component supply device, or other components, and does not cause an accident such as breakage or deformation of such a small and precise component.

Further, according to the present invention, the OF of the power supply is
When the circuit is switched by the switching means at F, the second
Actuates the first restricting pin to prevent the rotation of the cam lever, thereby reliably preventing the mounting spindle from lowering. Therefore, even if the power is turned off for a long time and the power of the auxiliary drive source is reduced, the mounted spindle that has been once raised will not be lowered.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an electronic component mounting head according to an embodiment of the present invention.

FIG. 2 is a left side sectional view of the electronic component mounting head shown in FIG. 1, in a state where a mounting spindle is raised.

FIG. 3 is a left side sectional view of the electronic component mounting head shown in FIG. 1, in a state where a mounting spindle is lowered.

FIG. 4 is a left side sectional view of the electronic component mounting head shown in FIG. 1 when the mounting spindle is raised when the power is turned off.

5 is a cross-sectional view taken along the line VV of FIG. 4 and shows a state in which the first and second restriction pins are switched to a blocking position on the leftmost mounting spindle. .

FIG. 6 is a right side sectional view of the electronic component mounting head shown in FIG. 1, in a state where a centering claw is opened;

FIG. 7 is a right side sectional view of the electronic component mounting head shown in FIG. 1, in a state where a centering claw is closed;

[Explanation of symbols]

 Reference Signs List 1 electronic component mounting head 1a mounting head main body 2 nozzle 3 centering claw 15 mounting spindle 20 first cam lever 23 cam follower 24 spring 30 mounting spindle elevating cam 41 first air cylinder 43 pressing shaft 44 second air cylinder 45 Operating shaft 50 First restricting pin 80 Second cam lever 82 Cam follower 85 Centering claw opening / closing cam 90 Second restricting pin

Claims (3)

(57) [Claims] 1. An electronic component mounting head provided in an electronic component automatic mounting device for holding an electronic component and mounting the electronic component on a printed circuit board. A mounting spindle mounted on a printed circuit board; a first cam lever having one end engaged with the mounting spindle and the other end abutting on a cam via a cam follower, and rotating to raise and lower the mounting spindle; A spring for urging the first cam lever in a direction for lowering the mounting spindle; and a cam valley for rotating the first cam lever by rotating the first cam lever against the urging force of the spring at a peak of the cam. A mounting spindle lifting / lowering cam for controlling the drive so as to lower the mounting spindle by rotating the first cam lever by the urging force of the spring; Switching means for switching a path, a first actuator which is operated by switching of the switching means, rotates the first cam lever away from the cam in a direction for raising the mounting spindle, and drives the first actuator. An electronic component mounting head, comprising: an auxiliary power source; 2. A first restricting pin, which is operated by switching of the switching means and prevents the first cam lever from rotating in a direction for lowering the mounting spindle, rotates the first cam lever. 2. The electronic component mounting head according to claim 1, further comprising a second actuator inserted into a blocking position. 3. A second cam lever which rotates together with the first cam lever by the operation of the first actuator and rotates in a direction to open a centering claw, and the second cam lever by an operation of the second actuator. The electronic component according to claim 2, further comprising a second regulating pin that rotates together with the first regulating pin and prevents the second cam lever from rotating in a direction in which the centering claw closes. Mounting head.