JPH0695600B2 - Rotation direction correction device for suction electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the correction of the rotation direction of a suction electronic component for correcting the orientation of the rotation direction of the electronic component suctioned by the suction pin in the electronic component automatic mounting machine. Regarding the device.

(Summary of the Invention) The present invention relates to a rotation direction correction device for a suction electronic component for correcting the posture in the rotation direction of the electronic component sucked by a suction pin in an electronic component mounting machine. The rotation correction table is brought into contact with the bottom surface, and the friction between the electronic component and the rotation correction table is used to rotate the electronic component to execute the posture correction, thereby simplifying the mechanical portion related to the rotation correction. Is.

(Problems to be Solved by Conventional Techniques and Inventions) Conventionally, when an electronic component is suction-held by a suction pin and mounted on a printed circuit board, the posture of the sucked electronic component is taken into an image processing apparatus and used as a reference. The bonding posture to the substrate is corrected based on the result of comparison with the posture data, but it is generally performed by rotating the entire mechanism around the suction pin or the mounting head itself having the suction pin.

The structure of the rotating device is one in which a rotating mechanism is applied to the mounting head from the outside at one of the stop positions during conveyance as in JP-A-62-30399, or a rotating mechanism is incorporated in the mounting head itself. Etc.

A pulse motor or a servomotor is generally used as the rotary drive source. When it is incorporated into a mounting head, its weight and complexity are problems, and it is almost impossible to increase the number of suction pins (for the purpose of increasing the variety of mounting electronic parts).
When a rotary drive source is provided externally, it can be configured even if the number of suction pins is large, but it is still complicated and heavy because it requires a rotatable structure for each suction pin and a gear device for coupling rotation. Things are unavoidable to some extent.

In view of the above points, the present invention brings a rotation correction table into contact with the suction electronic component at the lower end of the suction pin, and uses the friction between the electronic component and the rotation correction table to execute the posture correction in the rotation direction of the electronic component. By doing so, it is an object of the present invention to provide a rotation direction correction device for a suction electronic component in which the mechanism of a suction portion having suction pins is simplified and the mechanism is not complicated even when the number of suction pins is large.

(Means for Solving the Problems) In order to achieve the above object, the present invention is directed to a suction portion having a suction pin that is biased downward, and a suction pin that is vertically movable so as to face a lower end of the suction pin. A rotation correction table having a rotation center axis coinciding with the center axis of the electronic component, the rotation correction table at the time of rising is brought into contact with the bottom surface of the electronic component sucked by the suction pin, and the electronic component and The suction pin is lifted via the electronic component, and the electronic component is rotated by the rotation amount of the rotation correction table due to the friction between the rotation correction table and the bottom surface of the electronic component.

(Operation) In the device for correcting the rotation direction of the suction electronic component of the present invention,
The electronic component is rotated by the amount of rotation of the rotation correction table by friction between the rotation correction table and the bottom surface of the electronic component, and the rotary drive source and the rotation are provided on the suction portion side (mounting head side) having the suction pin. It is not necessary to provide a gear device or the like for coupling, and the mechanism can be simplified. Further, even if the number of suction pins increases, the mechanism does not become complicated.

(Embodiment) Hereinafter, an embodiment of a rotation direction correcting device for a suction electronic component according to the present invention will be described with reference to the drawings.

In FIGS. 1 to 6, reference numeral 1 denotes a suction portion provided on the mounting head side, and the suction portion 1 has a suction pin 2. Further, 3 is a rotation correction unit, which is a rotation correction table 4
have.

First, referring to FIG. 2, an explanation will be given of the suction part 1 and a structure for mounting the suction part 1 to the mounting head. Suction part 1 with suction pin 2
Is a cylindrical holding member 21 that holds and integrates the suction pin 2 and is fitted inside the flanged cylindrical fitting portion 20 for replacement in a vertically movable and rotatable manner. This is a structure in which a brake member (22), which is freely contactable with a holding member (21), and an illumination reflection disk (23) for electronic component imaging are fixed to each other. An engagement groove 24 is formed on the outer periphery of the replacement fitting portion 20. In addition,
A recess 27 is formed on the outer periphery of the holding member 21, and the holding member 21
13A, 27, 13B, 13 between the outer circumference and the inner surface of the replacement fitting part 20
Constitutes a suction path that continues.

Such a suction unit 1 is a holder for the swingable mounting head 6 provided on the index table 5 that performs intermittent rotation operation.
It is provided so that it can be attached to and removed from 7A and 7B. That is, the holder 7A is arranged at the main holding position P ₁ which is eccentric with respect to the swing center axis X of the mounting head 6, and
The holder 7B is arranged at the sub-holding position P ₂ which is symmetric with respect to the eccentric distance. A locking lever 8 is pivotally attached to each of the holders 7A and 7B by a pin 9, and each locking lever 8 is biased by a ring spring 10 so as to project into the holder. Further, a push-down pin 11 biased downward by a compression spring 15 is arranged in the holder upper space. The holder 7A at the main holding position P ₁ is fixed to the lower end of the hollow lifting shaft 12 of the mounting head 6 and has a vacuum suction passage 13. That is, the holder 7A at the main holding position P ₁ has a lifting function and a vacuum suction function, and is for holding the suction portion 1 for actually sucking an electronic component. The holder 7B at the sub-holding position P ₂ is fixed to the mounting head 6 and has neither a lifting function nor a vacuum suction function, and is merely a replacement (with a different pin diameter) suction unit 1
For holding.

The attachment of the suction portion 1 to the holders 7A and 7B is performed by pushing up the suction portion 1 with respect to the recessed portion of the holder and engaging grooves on the outer periphery of the replacement fitting portion 20.
This is done by engaging 24 with the protrusion of the locking lever 8. The suction pin 2 of the suction portion 1 attached to the holder 7A is communicated with the vacuum suction passage 13 through the suction passage 13A in the holding member 21 and the suction passage 13B of the replacement fitting portion 20 so as to be vacuum-sucked. Has become. Further, in order to release the suction portion 1, the detaching rod 25 on the mounting head 6 side is lowered and the holding plate 26 is used to engage the locking lever 8.
This can be performed by disengaging the engagement groove 24 with the engagement groove 24.

On the other hand, the rotation correction section 3 is assembled to the unit frame 31 fixed on the base 30 of FIG. A ball slide bearing 32 is rotatably attached to the unit frame 31 by a ball bearing 33, and the shaft portion 4A of the rotation correction table 4 is movably supported by the ball slide bearing 32. The shaft portion 4A has a rotation transmission plate portion 34 and a lifting drive pot portion.
35A and 35B are integrated. A belt wheel (pulley) 35 is fixed to the lower portion of the ball slide bearing 32, and a rotation transmission pin 36 is fixed to the belt wheel 35. The rotation transmission pin 36 is fitted (or engaged) with the rotation transmission plate portion 34 to transmit the rotational force to the rotation transmission plate portion 34, but the vertical force is not transmitted to each other.

Further, on the unit frame 31, a pulse motor 40 (for example, a 1.8 degree division) serving as a rotation drive source and a speed reducer 41 are provided.
(Eg reduction ratio 1/10) is fixed, the rotation of the pulse motor 40 is transmitted to the input shaft of the speed reducer 41 by the transmission mechanism using the timing belt 42, and is fixed to the reduced speed output shaft of the speed reducer 41. A timing belt 44 is wound around the belt wheel 43 and the belt wheel 35.

Further, as shown in FIGS. 1, 3 and 5, the raising / lowering drive arm 45 and the raising / lowering drive lever 46 are pivotally supported by a pin 47 with respect to the unit frame 31, and the raising / lowering drive lever 46 is
The roller 48 at the tip of the is engaged between the elevation drive pots 35A and 35B. A compression spring 47 for urging the tip of the lever 46 in a downward direction is arranged on the rear end side of the lever 46, and an air cylinder 48 is fixed on the arm 45. When operating the air cylinder 48, attach the stopper bolt 49 to the rear end of the lever 46.
It is pushed down until it comes into contact with the arm 45 and serves as a cushion when the rotation correction table 4 is raised via the lever 46 by the downward driving force F applied to the end portion of the arm 45.

The upper surface of the rotation correction table 4 is composed of a rubber plate 51 having a hardness of about 90 and having carbon mixed therein so as to have conductivity. This is to increase the coefficient of friction of the upper surface of the table with the rubber plate 51, and to impart conductivity to prevent electrostatic breakdown due to static electricity being applied to the leads of the electronic component. In addition, the electronic component 50
The central axis of the suction pin 2 at the specific stop position that has sucked is coincident with the central axis of rotation of the rotation correction table 4.

In the configuration of the above embodiment, the rotation correction table 4 of the rotation correction unit 3 is normally in the most lowered state (the air cylinder 48 is in the non-operating state) as shown in FIG. The suction portion 1 is in the state shown in FIG. 2, and the bottom surface of the cylindrical holding member 21 integrated with the suction pin 2 is pressed against the brake member 22 by the pressing pin 11 urged downward. As a result, the suction pin 2 that has sucked the electronic component (for example, surface mounting electronic component) 50 does not normally rotate.

Now, when the electronic component 50 that needs the posture correction in the rotation direction is sucked by the suction pin 2 by the intermittent rotation of the index table 5 and comes directly above the rotation correction table 4, the air cylinder 48 operates and the lifting drive lever. The tip of 46 is lifted as shown in FIG. 1, and the arm 45 and the lever 46 are rotated substantially as a unit by the driving force F of the end of the elevation drive arm 45, and the shaft portion 4A of the rotation correction table 4 is rotated. Lift up.
As a result, as shown in FIG. 6, the electronic component 50 and the suction pin 2 are slightly lifted on the rotation correction table 4, and the bottom surface of the holding member 21 integrated with the suction pin 2 is lifted from the brake member 22. . At this time, the center of the upper surface of the holding member 21 is pushed by the push-down pin 11 having a sharp tip, but the friction between the holding member 21 and the pin 11 and the inner peripheral surface of the replacement fitting portion 20 is small, The suction pin 2 is in a state where it can easily rotate. In this state, the rotation correction table 4 is rotated by the rotation correction amount previously obtained by image processing or the like, and the friction between the electronic component 50 and the upper surface of the rotation correction table is used to rotate the electronic component 50 by the rotation correction amount. , Perform posture correction in the rotation direction.

In the above embodiment, the suction unit 1 is detachable from the mounting head 6 and replaceable, but it can be applied to a structure in which a large number of suction pins having different diameters are arranged on the mounting head.

Although not shown, friction can be enhanced by providing a single hole or a plurality of nozzles formed of a rubber tube or the like for adsorbing the lower surface of the electronic component 50 on the upper surface of the rotation correction table to adsorb the same. .

Further, if it is allowed that the tip of the suction pin is easily worn and the surface of the electronic component is easily scratched, the structure can be simplified by rotating only the component without rotating the suction pin.

(Effects of the Invention) As described above, according to the rotation direction correction device of the suction electronic component of the present invention, the rotation correction table is brought into contact with the bottom surface of the suction electronic component, and the friction between the electronic component and the rotation correction table is used. Since the electronic component is rotated to perform the posture correction, it is possible to simplify the mechanical portion related to the rotation correction on the suction portion side having the suction pin. Further, since the rotation correction table can be shared by each suction pin, there is an advantage that the mechanism does not become complicated even when the number of mounting heads or the number of suction pins is large. In addition, the mounting head having a mechanism for selecting the suction pin and the mechanism for detaching and replacing the suction portion having the suction pin can be configured without any burden. further,
Basically, the surface mounting type electronic parts are mounted on the printed circuit board and the mounting part is at the bottom, so that the rotation correction table is brought into contact therewith for rotation. It can be said that it can be applied to the surface mounting parts. Further, since the electronic component is mounted on the substrate, it is safely formed against vertical stress, and therefore, the sucked electronic component is not damaged.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a rotation direction correction device for an adsorption electronic component according to the present invention, FIG. 2 is a front sectional view showing an adsorption portion and a mechanism portion for holding the adsorption portion, and FIG. 3 is a rotation correction portion. FIG. 4 is a sectional view of the same side, FIG. 4 is a front sectional view showing a lowered state of the rotation correction table, and FIG. 6 is a front sectional view showing a raised state of the rotation correction table. 1 ... adsorption part, 2 ... adsorption pin, 3 ... rotation correction part, 4
...... Rotation correction table, 5 …… Index table,
6 ... Mounting head, 7A, 7B ... Holder, 8 ... Locking lever, 11 ... Pushing down pin, 12 ... Hollow shaft, 20 ...
Replacement fitting part, 21 ... Holding member, 22 ... Brake member,
24 …… engaging groove, 30 …… base, 31 …… unit frame,
40 …… Pulse motor, 41 …… Reducer, 42,44 …… Timing belt, 45 …… Up / down drive arm, 46 …… Up / down drive lever, 48 …… Air cylinder.

Claims (2)

[Claims] 1. A suction correction part having a suction pin biased downward, and a rotation correction table having a rotation center axis facing the lower end of the suction pin and being movable up and down and coinciding with the center axis of the suction pin. The rotation correction table at the time of ascending is brought into contact with the bottom surface of the electronic component sucked by the suction pin, and the suction pin is lifted through the electronic component and the electronic component by the rotation correction table, and the rotation correction is performed. A rotation direction correction device for a suction electronic component, wherein the electronic component is rotated by a rotation amount of the rotation correction table due to friction between a table and a bottom surface of the electronic component. 2. The suction part includes a holding member integrated with a suction pin, and a brake member that can be brought into contact with the holding member, and the holding member is urged in a direction of being pressed against the brake member. The rotation direction correction device for the suction electronic component according to claim 1, wherein the holding member and the brake member are separated from each other when the electronic component and the suction pin are lifted by the rotation correction table.