JPH0738515B2 - Electronic component mounting device - Google Patents

Description

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

(B) Conventional technology For the mounting work of leadless small electronic components (hereinafter simply referred to as "components"), the components are picked up from the component supply device by vacuum suction means, transported to the substrate, and applied to the substrate for adhesion. It is the repetition of the operation of pressing parts onto the agent or solder paste. Examples of devices for performing such work can be found in JP-A-55-24494 and JP-A-60-182795.

In the device for performing the above 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 device, or the component is mounted on the board. When pressing, the parts are not subject to excessive shock. 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 the suctioned component is pressed against the substrate. It proposes a device that keeps the speed at a proper speed. It is thought that the adoption of such a device will solve various problems such as cracking of parts due to excessive impact or occurrence of mounting error due to jumping of the vacuum suction means. The application to the type in which a large number of vacuum suction means are arranged at the periphery of the rotary index table, which is described in the Japanese Laid-Open Patent Publication No. 60-182795, greatly increases the mass of the rotary system due to the large installation of linear motors, It is difficult to realize because the cost of the equipment is large.

(C) Problems to be Solved by the Invention In the present invention, a plurality of vacuum suction means are arranged on the periphery of the support means that performs intermittent rotation in a fixed direction, and the vacuum suction means is provided on the component supply device, or When a component is sucked and mounted every time it comes down on the board, it tries to maintain the shock applied to the component by the vacuum suction means below a certain level regardless of the thickness of the component. It is a thing.

(D) Means for Solving Problems In the above apparatus, the vacuum suction means is lifted and lowered by a reciprocating body operated by a cam. The reciprocating body is arranged at a position corresponding to the component supply device, a position corresponding to the board, and a necessary position. It is a seesaw lever pivotally supported by a support that connects the reciprocating body and the cam. The support base is
The position control means slides along the arrangement direction of the seesaw lever. A cam follower roller is interposed between the seesaw lever and the cam. The cam follower roller is supported by one end of the seesaw lever so as to be movable only in the length direction of the lever, and is also movable by the immovable guide member outside the lever only in the direction perpendicular to the sliding direction of the support base. It is supported.

(E) Action When mounting thin parts, move the support base closer to the cam. Then, the position of the fulcrum of the seesaw lever is close to the cam and far from the reciprocating body, and the operation stroke of the reciprocating body becomes large so that the vacuum suction means can reach the parts sufficiently. For hot parts, move the support in the opposite direction, and move the reciprocating body with a small motion stroke according to the thickness of the parts. As a result, in the case of any of the components, the deceleration section in the cam curve can be sufficiently effective to press the vacuum suction means against the component or press the component against the board, and the deceleration is sufficient due to the heat of the component. It is possible to avoid a situation in which the contact between the vacuum suction means or the substrate and the component starts before it is performed.

(F) Embodiment In the drawings, (1) is a support means for intermittent rotation in a fixed direction. The supporting means (1) comprises an upper rotating body (2) and a lower rotating body (3), both of which are circular in plan view and fixed to a vertical index shaft (4). The index shaft (4) rises from an index device (not shown) and is supported at its upper end by the bearing portion (6) of the immovable deck (5) mounted on the support means (1). The inside of the index shaft (4) is an intake passage (7) communicating with a vacuum source (not shown). The support means rotates in steps of 45 °, and as shown in FIG. 6, there are eight work stations (I) ... (VI
II) is arranged, and eight arms (8) are radially projected from the lower rotating body (3) in accordance with this. The arm (8) is supported by a slider (9) mounted vertically on the peripheral surface of the lower rotary 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. 11) screwed into the upper rotary body (2). The slider (9) projects the roller (12) outward, and the reciprocating body pushes the roller at a predetermined work station to lower the slider (9). The reciprocating body 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, is fitted onto the tip of the arm (8) from the outside, and is rotatable about the axis of the arm (8), that is, about the horizontal axis. Turret (20)
A driven gear (21) is fixed to the outer end surface of the. Four kinds of suction nozzles (22), (23), (24) and (25) having different thicknesses radially project from the peripheral surface of the turret (20) at 90 ° intervals. Each of the suction nozzles can be retracted toward the center of the turret (20) and is pushed out to the projecting position by the spring (26). The center of the arm (8) is
7). This suction path (27) is connected to the suction nozzle (2
2) (23) (24) (25) only those that came directly under
It communicates through the communication hole (28). (29) is the intake passage (27)
It is a screw plug that closes the end of the turret (20) and also acts as a stopper. 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 hose (41). The valve (40) is connected to the intake passage (7) by the hose (42) and controls the suction of the intake passage (27) to be turned on and off. Valve (4
Opening and closing operation of (0) is performed by a lever type actuator (43) having a roller at the tip. That is, when the actuator (43) is pushed down, the valve is opened, and when not, the valve is closed. The actuator (43) is controlled by a pusher (45) moved up and down by the air cylinder (44) in the work station (I) and a push up and down by the air cylinder (46) in the work stations (V) and (VI). The work is performed by the child (47) and the work stations (II), (III) and (VI) between them by the pressing plate (48) fixed to the bearing portion (6). The pressing plate (48) also serves as a support member for the air cylinders (44) (46), and the pressing elements (45) (47) form a plane that is substantially continuous with the pressing body (48) when it descends. There is. Since each valve (40) is arranged at the delay position with respect to the arm (8) to which it belongs, the pressing plates (45) (47) are also displaced from the work station to which they belong.

A component supply device (50) is arranged in the work station (I). The component supply device (50) feeds the component supply carrier tape (51) by one pitch, and supplies the components (52) one by one to the vacuum suction means (30). The carrier tape (51) is
Embossing a plastic sheet into 1 part (52)
A recess for accommodating one by one is made, and the recess is covered 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 a large number of such carrier tapes (51) arranged in a direction perpendicular to the paper surface (FIG. 1), and by moving the whole in a direction perpendicular to the paper surface, a carrier tape containing the necessary parts. (51) can be selected.

An XY table (61) on which a substrate (60) is placed is arranged at the work station (V) (Fig. 11). A parts collection box (62) is placed at the work station (VI). At the work station (VI), place the attitude determination device (63) for the parts. 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 adsorbed.

No. 7 at work station (VII) or (VIII)
The suction nozzle selection device (70) shown in FIG. 9 is arranged. This device (70) has an elevator (71) supported by the immovable deck (5) as a main component. The elevator (71)
Is attached to a slider (72) that slides in the vertical direction, and is moved up and down by a lever (73) that transmits the movement of a cam (not shown). A selector gear (74) is horizontally supported in the lower part of the elevator (71) so as to face the center of rotation of the support means (1). The selector gear (74) is connected to the electric motor (75) supported by the elevator (71) via the bevel gears (76) (77) and meshes with the driven gear (21) of the turret (20) when the elevator (71) descends. ,
The rotation of the electric motor (75) is transmitted 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 fixed to the arm (8) by the holder (8
It is held by 1) so that it can slide parallel to the axis of the arm (8) and is pushed toward the turret (20) by a spring (82). The lock pin (80) is attached to the end face of the turret (20).
The groove (83) that receives the tip of the suction nozzle (22) (2
3) A total of four sections will be formed behind each of (24) and (25). At the rear end of the lock pin (80), a U-shaped lever support (8
4) Fix. 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).

The reciprocating body (90) is placed on the work stations (I) and (V). When the centering or direction setting device of the suction component is arranged at the work station (II) or (III), the reciprocating body (90) is also placed here. The reciprocating body (90) 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. Reciprocating body (9
A pressing head (93) facing the roller (12) of the slider (9) is fixed to the lower end of 0), and a roller bracket (94) is fixed to the upper end. Bearing part (91) and pressing head (93)
The reciprocating body (90) is pushed downward by the spring (95) inserted between the two. Reference numeral (96) is a cam shaft, and reference numeral (97) is a cam which rotates together with the cam shaft (96) to give a motion to the reciprocating body (90). A seesaw lever (100) connects the cam (97) and the reciprocating body (90). Seesaw lever (100)
Is attached to a support (101) by a shaft (102).
(103) is a small deck fixed on the immovable deck (5), and a pair of rails (104) are arranged on the upper surface in parallel with the arrangement direction of the seesaw lever (100).
04) supports the support base (101) so that it can slide horizontally. (105) is an electric motor supported on the immovable deck (5) by a bracket (106), and its output shaft (10
The feed screw (108) screwed to the support base (101) is connected to 7).

The seesaw lever (100) holds a cam follower roller (110) on one side of the shaft (102), which is brought into contact with the lower surface of the cam (97), and the roller of the reciprocating body (90) on the opposite side. The roller (111) protruding from the bracket (94) is being lifted. A long groove (113) is formed on one side of the seesaw lever (100) so as to vertically penetrate therethrough, and the main body of the cam follower roller (110) has a long groove (11).
2) and its supporting shaft (114) projects from the long groove (113) to both sides of the seesaw lever (100). That is, the cam follower roller (110) is movable in the length direction of the seesaw lever (100) along the long grooves (112) (113). The bearing shaft (114) is covered with a bearing sleeve (115) for better sliding. The bearing sleeve (115) is formed of a self-lubricating bearing metal or tetrafluoroethylene. The portions of the support shaft (114) and the bearing sleeve (115) protruding from the seesaw lever (100) are fixed guide members (1
Held in 16). The immovable guide member (116) stands up on the small deck (103) so as to sandwich the seesaw lever (100), and has a long groove (117) perpendicular to the sliding direction of the support base (101), that is, in the vertical direction, A bearing sleeve (115) is engaged with the long groove (117) to support the cam follower roller (110) directly below the cam (97) so as to be movable only in the vertical direction.

The above device operates as follows. FIG. 11 shows the behavior of the vacuum suction means (30) in the work stations (I) (IV) (V) (VI). The vacuum suction means (30) arriving at the work station (I) is stopped 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 lifting / lowering body (90) descends to push down the slider (9), and the suction nozzle (22) is pressed against the component (52). 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) ascends as the lifting body (90) rises, and is intermittently rotated by the support body (1) from the work station (I) to (II) and from (II). Carried to (III) and from (III) to (IV). The actuator (43) of the moving valve (40) is continuously pressed by the pressing plate (48), and the part (52) is moving.
The adsorption of is not interrupted. Work station (IV)
Then, the attitude determination device (63) inspects the attitude of the component (52). If the component (52) does not block the light beam of the photosensor if it is adsorbed in a normal posture as shown in FIG. 11, it is determined that there is no problem. The vacuum suction means (30) leaving the work station (IV) arrives at the work station (V). At the time of arrival, the pusher (47) was in the descent position,
The vacuum suction means (30) continues to suck the component (52).
When the vacuum suction means (30) descends and the component (52) is pressed against the adhesive applied to the substrate (60), the pressing element (47).
Rises and opens the valve (40) to release the adsorption. When the component (52) is sucked in an abnormal posture, the vacuum suction means (30) does not descend at the work station (V), and the presser (47) also descends to the work station (IV). Moving. Then, when the pressing element (47) rises here, the vacuum suction means (30) drops the component (52) into the component recovery box (62) and moves it to the work station (VII).

The suction nozzle selection device (70) provided in the work stations (VII) to (VIII) performs the following operation. 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. 7, and the tip of the lever (85) is located on the lever receiving (84). It's getting inside. Lock pin (80) is number 8
As shown in the figure, it engages with the groove (83) and firmly fixes the turret (20). Here, when it is necessary to change the suction nozzle (22) to be used to another one,
As shown in the figure, the elevator (71) descends and engages the selector gear (74) with the driven gear (21). When the elevator (71) descends, the lever (85) also rotates, causing the lock pin (80) to slide 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 angle turret (20) as needed.
Elevator (71) after changing the angle of the turret (20)
When is raised, the lever (85) is restored to the old position and the lock pin (80) is again engaged with the groove (83) to lock the turret (20).

As the cam (97) rotates and the seesaw lever (100) tilts downward to the right in FIG. 1, the reciprocating body (90) pushes down the vacuum suction means (30) by the force of the spring (95). The seesaw lever (100) swings around the shaft (102) as a fulcrum, and the fulcrum position varies depending on the thickness of the parts. When targeting a thin part (52) as shown in FIGS. 1 and 4, the support base (101) is brought close to the cam (97) to support the roller (111) of the seesaw lever (100). So that the amplitude of is large. For this reason, the operation stroke of the reciprocating body (90) becomes large, and although the component (52) is thin, the vacuum suction means (30) reaches the upper surface thereof, or the component (52) is disposed at the work station (V). It becomes possible to press 52) on the substrate (60) with appropriate pressure. Next, when handling a thick part (52 ') as shown in FIG. 5, the electric motor (105) is driven to move the support base (101) to the reciprocating body (90) by the feed screw (108). Attract to. Then, the ratio of the distance between the power point, the fulcrum, and the point of action changes,
The operation stroke of the reciprocating body (90) becomes smaller, the vacuum suction means (30) approaches the component (52 ') by utilizing the deceleration curve of the cam (97), and the component (52') is placed on the substrate (60). Will be pressed against. The cam follower roller (110)
Does not accompany the movement of the seesaw lever (100) and only moves up and down at a fixed position. If, for example, a pulse motor is used as the electric motor (105), the operation stroke of the reciprocating body (90) can be precisely numerically controlled. If the seesaw lever (100) and the electric motor (105) are attached to all work stations that require adjustment of the operation stroke of the reciprocating body (90), the seesaw levers (100) may interfere with each other. This can be solved by shifting the layout vertically.

(G) Effect of the Invention According to the present invention, it is possible to continuously expand and contract the up-and-down stroke given to the vacuum suction means by the cam according to the thickness of the component, and maintain the impact given to the component at a certain level or less. is there. In addition, stroke adjustment is only required to change the position of the seesaw lever, and control is easy. Further, since the cam and the cam follower roller are always in a fixed alignment relationship, it is possible to faithfully transmit the delicate movement due to the cam curve to the reciprocating body by changing only the amplitude. Moreover, this device need only be installed at the work station where it is needed, and does not significantly increase costs.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a vertical sectional view, FIGS. 2 and 3 are partial sectional top views and partial sectional side views of a seesaw lever portion, and FIGS. FIG. 6 is a top view of the support means, FIG. 7 is a side view of the suction nozzle selecting device, and FIG. 8 is related to FIG. FIG. 9 is a top view of the vacuum suction means, FIG. 9 is a side view of the suction nozzle selection device as in FIG.
FIG. 11 is a top view of the vacuum suction means related to FIG. 9, and FIG. 11 is an operation explanatory view showing the behavior of the vacuum suction means in each work station in parallel. (52) (52 ') …… Parts, (60) …… Board, (50) ……
Parts supply device, (1) …… Supporting means, (30) …… Vacuum suction means, (90) …… Reciprocating body, (97) …… Cam, (10
0) …… Seesaw lever, (101) …… Support base, (105)
...... Motor (position control means), (110) …… Cam follower roller, (116) …… Fixed guide member.

Claims (1)

[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 normally keeps a height away from the substrate or the component supply device, and at least a part corresponding to the component supply device and a part corresponding to the substrate, Vacuum suction means,
A plurality of reciprocating bodies that move downward toward the target each time they reach the target; a cam that gives movement to the reciprocating body; and a seesaw lever arranged to connect the cam and the reciprocating body. A support base that pivotally supports the seesaw lever and is slidable in the arrangement direction of the lever, a position control means for the support base, and one end of the seesaw lever that moves only in the length direction of the lever. An electronic device provided with a cam follower roller that is supported as much as possible, and is supported by an immovable guide member outside the lever so as to be movable only in a direction perpendicular to the sliding direction of the support base, and that contacts the cam in this state. Parts mounting device.