JPH0693558B2 - Electronic component mounting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for mounting a surface mount electronic component represented by a chip type capacitor or a chip type resistor on a circuit board.

(B) Conventional technology When mounting surface-mounted electronic components (hereinafter simply referred to as "components"), the component is picked up from the component supply device by vacuum suction means, carried onto the substrate, and the adhesive applied to the substrate. Or, the operation of pressing the parts against the solder paste is repeated. An example of an apparatus for performing such work is disclosed in Japanese Patent Laid-Open No. 55-
It can be found in Japanese Patent No. 24494 and Japanese Patent Laid-Open No. 60-182795.

Now, in the apparatus for performing the above-mentioned work, the vacuum suction means is normally moved up and down by a cam. By devising the cam curve, the vacuum suction means is pressed against the component in the component supply means, or the component is mounted on the board. Make sure that the parts are not subjected to excessive impact when pressing. However, the number of types of chip components has increased as electronic components have been made into chips, and the thickness dimensions are also diverse, making it extremely difficult to keep the impact or pressure applied by the vacuum suction means within the allowable range for any component. It was As a measure to solve this problem, in Japanese Patent Laid-Open No. 60-66500, the vacuum suction means is driven by a linear motor, and when the vacuum suction means hits a component by the control of the linear motor, or when the suctioned component is a substrate. We propose a device that keeps the speed at a proper speed when pressed against. By adopting such a device, various problems such as cracking of parts due to excessive shock or occurrence of mounting error due to jumping of the vacuum suction means are considered to be solved.
The application to the type in which a large number of vacuum suction means are arranged at the periphery of the rotary index table, as described in Japanese Patent Publication No. 60-182795 and Japanese Patent Publication No. 60-182795, causes the mass of the rotary system to be significantly reduced by the large number of linear motors installed. It is difficult to realize because it will increase significantly and the cost of the device will increase significantly.

(C) Problem to be Solved by the Invention In the present invention, a plurality of vacuum suction means are arranged on the periphery of a support means that performs intermittent rotation in a fixed direction, and the vacuum suction means is
When a component is sucked and mounted by dropping it every time it reaches the component feeder or the substrate, the impact applied by the vacuum suction means to the component is below a certain level regardless of the thickness of the component. It is what you try to maintain.

(D) Means for Solving the Problems In the above apparatus, the vacuum suction means is lifted and lowered by the lift means that is vertically moved by a constant stroke by a cam. The elevating means is arranged outside the supporting means at a position corresponding to the substrate, and is connected to the vacuum suction means that has reached above the substrate. Further, means for changing the height level of the top dead center and the bottom dead center of the elevating means are provided. The same lifting means is also arranged at the location corresponding to the component supply device.

(E) Action The vacuum suction means that has reached the upper side of the board is lowered by a certain stroke by the elevating means, and the component is mounted on the board.
The height levels of the top dead center and the bottom dead center of the elevating means are shifted downward for thin parts and upward for thick parts. As a result, in the case of any of the parts, the deceleration section in the cam curve can be sufficiently used to press the part against the board, and the part is thick, so that the board and the part are not decelerated before deceleration is sufficiently performed. It is possible to avoid the situation where contact starts. Also for the lifting means arranged at the location corresponding to the component supply device, the height levels of the top dead center and the bottom dead center are adjusted, and the deceleration section in the cam curve is effective to press the vacuum suction means against the components.

(F) Embodiment In the drawings, reference numeral 1 is a supporting means for intermittently rotating in a fixed direction. The supporting means 1 is composed of an upper rotating body 2 and a lower rotating body 3, each of which has a circular planar shape and is fixed to a vertical index shaft 4. The index shaft 4 rises from an index device (not shown), and its upper end is supported by the bearing portion 6 of the immovable deck 5 mounted on the support means 1. Index shaft 4
The inside of is an intake path 7 that communicates with a vacuum source (not shown). The support means 1 is a device that rotates in steps of 45 °.
As shown in FIG. 4, eight work stations I, II ... VIII are arranged around the periphery, and eight arms 8 are radially projected from the lower rotary body 3 in accordance with this. Arm 8
Is supported by a slider 9 mounted vertically on the peripheral surface of the lower rotating body 3 and is movable in the vertical direction. The slider 9 is pulled up by a spring 10 stretched between the slider 9 and the upper rotary body 2 until it hits a stopper bolt 11 (FIG. 9) screwed into the upper rotary body 2. Slider 9 rolls outward 12
, And the elevating means pushes the roller 12 at a predetermined work station to lower the slider 9. The elevating means and its operating mechanism will be described later.

The arm 8 supports the turret 20 at its tip. The turret 20 has a cylindrical shape and is fitted to the tip of the arm 8 from the outside.
It is rotatable about the axis of the arm 8, i.e. about the horizontal axis. A driven gear 21 is fixedly mounted on the outer end surface of the turret 20. Four types of suction nozzles 22, 23, 24, 25 having different thicknesses radially project from the peripheral surface of the turret 20 at 90 ° intervals. Turret 20 for each suction nozzle
It can be retracted in the direction of the center and is pushed out to the projecting position by the spring 28. The center of the arm 8 is an intake passage 27. The suction passage 27 communicates with the suction nozzles 22, 23, 24, 25 only through the suction nozzles 27, 23, 24, 25 directly below the communication holes 28. Reference numeral 29 is a screw plug that closes the end of the intake passage 27 and also serves as a retainer for the turret 20. The arm 8 thus configured and its attached elements are collectively referred to as vacuum suction means 30.

The upper rotating body 2 supports the valve 40. The valves 40 are provided in the same number as the arms 8 and are connected to the intake passage 27 by the hoses 41. The valve 40 is connected to the intake passage 7 by a hose 42 and controls the suction of the intake passage 27 from ON to OFF. The opening / closing operation of the valve 40 is performed by a lever type actuator 43 having a roller at its tip. Ie actuator 43
When is pressed down, the valve is open; otherwise, the valve is closed. The actuator 43 is controlled by a pusher that is moved up and down by an air cylinder 44 in the work station 1.
In the work stations V and VI, the pressing element 47 is moved up and down by the air cylinder 46, and in the work stations II, III, and IV, the pressing plate 48 fixed to the bearing portion 6 is used. The pressure plate 48 is the air cylinder 4
It also serves as a support member for 4, 46 and forms a plane that is substantially continuous with the pressing plate 48 when the pressing elements 45, 47 are lowered. Since each valve 40 is arranged at the delay position with respect to the arm 8 to which it belongs, the pressers 45 and 47 are also displaced from the work station to which they belong.

At the work station I, a component supply device 50 is arranged. The component supply device 50 feeds the component supply carrier tape 51 one pitch at a time and supplies the components 52 one by one to the vacuum suction means 30. The carrier tape 51 is formed by embossing a plastic sheet to form recesses for accommodating the components 52 one by one and covering the recesses with a plastic cover film 53. The cover film 53 is peeled off just before the component suction position. The component supply device 50 has such a carrier tape 51.
Are arranged in a direction perpendicular to the surface (FIG. 1), and by moving the whole in a direction perpendicular to the paper surface, the carrier tape 51 containing the necessary parts can be selected.

An XY table 61 on which a substrate 60 is placed is placed in the work station V (Fig. 9). A parts collection box 62 is arranged in the work station VI. In addition, the work station VI is provided with a component attitude determination device 63. The attitude determination device 63 is composed of a photo sensor, and is placed at a height at which a light beam crosses directly below a component that is normally sucked.

The suction nozzle selection device 70 shown in FIGS. 5 and 7 is arranged in the work station VII or VIII. The device 70 has an elevator 71 supported by the immovable deck 5 as a main component. Elevator 71 is a slider that slides vertically
It is attached to 72, and can be moved up and down by a lever 73 that transmits the movement of a cam (not shown). Elevator 71
A selector gear 74 is horizontally rotatably supported in the lower part of the so as to face the center of rotation of the supporting means 1. The selector gear 74 is connected to the electric motor 75 supported by the elevator 71 via the bevel gears 76 and 77. When the elevator 71 descends, the selector gear 74 meshes with the driven gear 21 of the turret 20 and transmits the rotation of the electric motor 75 to the driven gear 21. 78 is a stopper that determines the lower limit of the descent of the elevator 71.

A lock pin 80 is attached to the upper surface of the arm 8. The lock pin 80 is held by a holder 81 fixed to the arm 8 so as to be slidable parallel to the axis of the arm 8 and is pushed by a spring 82 toward the turret 20. The end face of the turret 20 is provided with a groove 83 for receiving the tip of the lock pin 80, and the suction nozzles 22, 2
Behind 3, 24, and 25, one each, total of four. A U-shaped lever receiver 84 is fixed to the rear end of the lock pin 80. The lever receiver 84 receives one end of a bell crank type lever 85 supported by the immovable deck 5. The other end of the lever 85 is connected to the elevator 71 by a connecting rod 86.

Elevating means 90 is placed at work stations I and V. When placing a suction centering or orientation device on work station II or III, use the lifting means 90 also here.
Will be put. The elevating means 9 is a rod-shaped member supported by the bearing portion 91 of the immovable deck 5, and its rotation is stopped by the slide key 92 so that it can be moved only up and down. Lifting means
A pressing head 93 facing the roller 12 of the slider 9 is fixed to the lower end of 90, and a gear 95 is screwed to the male screw portion 94 of the upper end. The elevating means 90 is pushed downward by the spring 96 inserted between the bearing portion 91 and the pressing head 93. 97 is the cam shaft,
Reference numeral 98 is a cam that rotates together with the cam shaft 97 to give movement to the elevating means 90. 99 is a seesaw lever supported by a mounting plate 100 standing on the immovable deck 5, and rollers 10 at both ends
1, 102 are in contact with the lower surfaces of the cam 98 and the gear 95, respectively.

110 is a dead center position moving means, and the gear 95 also forms a part thereof.
This is a support base 111 fixed to the upper surface of the immovable deck 5.
An elongated gear 112 that is vertically supported by the support base 111, and is engaged with the gear 95 so that the gear 95 can move up and down relatively.
It is constituted by an electric motor 114 which is supported by and is connected to the gear 112 via a timing belt 113.

The above device operates as follows. FIG. 9 shows the behavior of the vacuum suction means 30 in the work stations I, IV, V and VI. The vacuum suction means 30 arrived at the work station I,
Stop with the suction nozzle 22 facing downward. At the time of arrival, the pusher 45 is in the raised position, and the vacuum suction means 30 does not generate suction force. Here, the elevating means 90 descends and pushes down the slider 9, and the suction nozzle 22 is pressed against the component 52. At this time, the air cylinder 44 lowers the pusher 45, the valve 40 is opened, and the suction nozzle 22 sucks the component 52. The vacuum suction means 30 that has sucked the component 52 rises as the lifting means 30 rises, and by intermittent rotation of the support 1, it is carried from work stations I to II, from II to III, and from III to IV. The actuator 43 of the valve 40 is continuously pressed by the pressing plate 48 during movement, and the suction of the component 52 is not interrupted.
At the work station IV, the attitude determination device 63 inspects the attitude of the component 52. If it is adsorbed in a normal posture as shown in FIG. 9, the component 52 does not block the light beam of the photosensor, so it is determined that there is no problem. The vacuum suction means 30 leaving the work station IV arrives at the work station V. Upon arrival, the pusher 47 is in the lowered position, and the vacuum suction means 30 continues to suck the component 52. The vacuum suction means 30 descends, and when the component 52 is pressed against the adhesive applied to the substrate 60, the pressing element 47 rises, and the valve 40 is opened to release the suction. When the component 52 is sucked in an abnormal posture, the vacuum suction means 30 does not move down in the work station V, and the pusher 47 moves down to the work station VI while also moving down. Then, when the pressing element 47 rises here, the vacuum suction means 30 moves the parts to the parts collection box 62.
It drops 52 and moves to work station VII.

The suction nozzle selection device 70 provided in the work stations VII to VIII performs the following operations. That is, when the vacuum suction means 30 arrives at the station, the selector gear 74 is above the driven gear 21 as shown in FIG.
The tip of the has entered the lever receiver 84. Lock pin
80 is engaged with the groove 83 as shown in FIG. 6, and firmly fixes the turret 20. Here, when it is necessary to change the suction nozzle to be used from 22 to another one, the elevator 71 descends as shown in FIG. 7, and the selector gear 74 is engaged with the driven gear 21. The lever 85 is also rotated by lowering the elevator 71, and the lock pin 80 is slid against the spring 82. As a result, the lock pin 80 comes out of the groove 83, and the turret 20 becomes rotatable. In this state, the electric motor 75 is driven to rotate the turret 20 by the required angle. When the elevator 71 is lifted after the angle of the turret 20 is changed, the turret 20 is locked after the lever 8 is restored to the old position and the lock pin 80 is again engaged with the groove 83.

The elevating means 90 is given a constant elevating stroke by the cam 98, and the force of the spring 96 pushes down the vacuum suction means 30.
The height levels of the top dead center and the bottom dead center vary depending on the thickness of the part. When targeting a thin part 52 as shown in FIGS. 1 and 2, the lifting means 90 is sunk in the gear 95 (the lifting means 90
The distance between the upper end of the gear and the upper end of the gear 95 becomes smaller −l ₁ ),
The lifting means 90 is moved up and down at a low position. This allows the parts
Even though 52 is thin, the suction nozzle 22 reaches its upper surface, or in the work station V, the parts 52
Can be pressed against the substrate 60 with an appropriate pressure.
Next, when handling a thick part 52 'as shown in FIG. 3, the electric motor 114 is driven to rotate the gears 112 and 95, and the lifting means 90 is pulled up (the upper end of the lifting means 90 and the upper end of the gear 95). The distance between them becomes large −l ₂ ). The elevating means 90 will be moved up and down more than before, and the suction nozzle 22 will be
Even though 2'is thick, the deceleration curve of the cam 98 is utilized to approach the component 52 ', and the component 52' is pressed against the substrate 60. If, for example, a pulse motor is used as the electric motor 114, the movement of the vertical dead center of the elevating means 90 can be precisely numerically controlled. The gear 95 also moves up and down while engaging with the gear 112 according to the movement of the elevating means 90.
114 is kept in a rotation stopped state. The dead center position moving means 110 does not necessarily have to be attached to all the elevating means 90. The work station can be omitted if a structure that can reduce the impact given to the component by devising the support base as illustrated in JP-A-61-135197 can be omitted.

(G) Effect of the Invention According to the present invention, by changing the positions of the top dead center and the bottom dead center when the vacuum suction means moves up and down, according to the thickness of the component,
It is possible to keep the impact given to the parts below a certain level. Further, the dead center position moving device may be arranged only at a necessary work station, which does not significantly increase the cost.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a vertical sectional view, and FIGS. 2 and 3 are vertical sectional views in a work station different from FIG. 1 in different operating states, FIG. Is a top view of the support means, FIG. 5 is a side view of the suction nozzle selection device, FIG. 6 is a top view of the vacuum suction means related to FIG. 5, and FIG. 7 is a suction nozzle selection device similar to FIG. Sectional views showing different operating states, FIG. 8 is a top view of the vacuum suction means related to FIG. 7, and FIG. 9 is an operation explanatory view showing the behavior of the vacuum suction means in each work station in parallel. . 52, 52 '... Components, 60 ... Substrate, 50 ... Component supply device, 1 ... Supporting means, 30 ... Vacuum suction means, 90 ... Lifting means, 98 ... Cam,
110 ... Dead center position moving means (means for changing the height level of the top dead center and the bottom dead center of the elevating means)

Claims (2)

[Claims] 1. A support means for intermittently rotating in a fixed direction above a substrate on which a component is to be mounted and a component supply device, and each of which is supported by a peripheral edge of the support means so as to be vertically slidable with respect to the support means. , And a plurality of vacuum suction means which are always kept at a height away from the substrate or the component supply device and a vacuum suction means which is outside the supporting means and reaches the upper side of the substrate, and lowers it. And a means for mounting and lowering the component on the substrate, a cam for vertically moving the lifting means by a constant stroke, and a means for changing the height level of the top dead center and the bottom dead center of the lifting means. An electronic component mounting device characterized by: 2. A support means for intermittently rotating in a fixed direction above a substrate on which a component is to be mounted and a component supply device, and each of which is supported by a peripheral edge of the support means so as to be vertically slidable with respect to the support means. , And a plurality of vacuum suction means which are always kept at a height apart from the substrate or the component supply device, and which are connected to the vacuum suction means which is outside the support means and reaches above the component supply device. An elevating means for lowering the vacuum suction means to adsorb the component to the vacuum suction means, a cam for vertically moving the elevating means by a constant stroke, and a means for changing the height level of the top dead center and the bottom dead center of the elevating means. An electronic component mounting apparatus comprising: