JPS63173400A - Electronic parts mounter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an apparatus for mounting small leadless electronic components, such as chip-type capacitors and chip-type resistors, on a circuit board.

(b) Conventional technology The work of mounting leadless small electronic components (hereinafter simply referred to as "components") involves picking up the component from the component supply device using vacuum suction means, transporting it onto the board, and applying adhesive applied to the board. This involves repeatedly pressing the component against the adhesive or solder paste.

An example of a device for performing such work is disclosed in Japanese Patent Application Laid-Open No. 55-24494.
This can be seen in Japanese Patent Application Laid-open No. 60-182795.

Now, in the equipment that performs the above work, the lifting and lowering system of the vacuum suction means is normally performed by a cam, and the cam curve is devised so that when the vacuum suction means is pressed against the components in the parts supply device, or when the parts are pressed against the board. When pressing the parts, avoid applying excessive shock to the parts. However, as the use of chips in electronic components progresses, the types of chip components increase and the thickness and dimensions become more diverse, making it extremely difficult to keep the impact or pressure applied by vacuum suction means to any component within an allowable range. Ta.

As a measure to solve this problem,
In No. 0, we proposed a device in which the vacuum suction means is driven by a linear motor, and by controlling the linear motor, the speed when the vacuum suction means hits a component or when the suctioned component is pressed against a substrate is maintained at an appropriate speed. There is. By adopting such a device, various problems such as cracking of parts due to excessive impact or mounting errors due to jumping of the vacuum suction means will be solved.
-2449 and Japanese Patent Application Laid-Open No. 60-182795, in which a large number of vacuum suction means are arranged around the periphery of a rotary index table, rotation = 3 - by installing a large number of linear motors. This is difficult to realize because the mass of the system increases significantly and the cost of the equipment also increases significantly.

(C) Problems to be Solved by the Invention The present invention provides a plurality of vacuum suction means arranged around the periphery of a support means that rotates intermittently in a fixed direction, and places the vacuum suction means on a component supply device or In a device that sucks and mounts components by allowing it to fall each time it comes onto a board, the impact applied to the components by the vacuum suction means can be maintained below a certain level regardless of the thickness of the component. It is something.

(d) Means for solving the problem - In the device described in (e), the vacuum suction means is raised and lowered by a reciprocating body operated by a cam. The reciprocating body has a part corresponding to the parts supply device, a part corresponding to the board, and
Place it where you need it. A seesaw lever pivotally supported on a support base connects the reciprocating body and the cam. A plurality of cam follower rollers are attached to the seesaw lever so as to be lined up in the longitudinal direction. The support base slides along the arrangement direction of the seesaw lever by the position control means.

(E) Function When mounting thin parts, slide the support base and bring the cam follower roller close to the fulcrum of the seesaw lever into contact with the cam. Then, the amplitude of the other end of the cam increases, and the reciprocating body moves with a large operating stroke, allowing the vacuum suction means to reach the component sufficiently. For thick parts, slide the support stand in the opposite direction and bring the cam follower roller far from the fulcrum of the seesaw lever into contact with the cam so that the reciprocating body moves with a small stroke that matches the thickness of the part. . As a result, in the case of any part, the deceleration section in the cam curve can be fully utilized to press the vacuum suction means against the part or the part against the board, and since the part is thick, the deceleration is sufficient. This prevents the vacuum suction means or the substrate from coming into contact with the component before the vacuum suction is performed.

(f) In the embodiment diagram, (1) is a support means that performs intermittent rotation in a fixed direction. The support means (1) consists of an upper rotating body (2>) and a lower rotating body (3), both of which have a circular planar shape and are fixed to a vertical index shaft (4).The index shaft (4) It stands up from the indexing device (not shown), and its upper end is supported by the bearing part (6) of the stationary deck (5) which was inserted onto the support means (1).The inside of the indexing shaft (4) is connected to a vacuum source (not shown). It has a continuous sliding intake passage (7).The support means rotates by 45 degrees on the sidewalk, and as shown in Figure 6, there are eight work stations (I) around it.
・(■) is arranged, and in accordance with this, eight wooden Arnos (8〉) are made to protrude radially from the lower rotating body (3).

The arm (8) can be supported by a slider (9) attached perpendicularly to the circumferential 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 it and the upper rotating body (2) until it hits the stopper bolt (11) (Fig. 11) screwed into the upper rotating body (2). . The slider (9) has a roller <12> protruding outward, and at a predetermined work station, the reciprocating body pushes the roller and lowers the slider (9). The reciprocating body and its operating mechanism will be described later.

The arm (8) supports a turret (20) at its tip.

The turret (20) has a cylindrical shape, fits into the tip of the arm (8) from the outside, and rotates around the axis of the arm (8).
That is, it is rotatable around a horizontal axis.

A driven gear (21) is attached to the outward end face of the turret (20).
) will be fixed. From the circumference of the turret (20), four types of suction nozzles (22) (23) (24) (
25) protrude radially at 90° intervals. Each suction nozzle can be retracted toward the center of the turret (20), and is pushed to a protruding position by a spring (26).The center of the arm (8) is an intake path (27). This intake passage (27) is connected to the suction nozzle (22) (23
) (24) and (25), only the one directly below communicates through the communication hole (28). (29) is the intake path (27
) at the end of the dormitory, which also serves as a stopper for removing the turret (20). Arm configured like this (8)
and its attached elements are collectively referred to as the vacuum suction means (30).

The upper rotating body (2) supports the valve (40). The same number of valves (40) as arms (8) are provided, and they are connected to the intake path <27> via a hose (41). Valve (40)
is connected to the intake path (7) by a hose (42),
This is to control the suction of the intake passage (27) from ON to FF. The opening/closing operation of the lubricant (40) is performed by a lever-type actuator (43) having a roller at its tip.

That is, when the actuator (43) is pushed down, the valve is open, and when not, the valve is closed. The actuator (43) is controlled by a presser (4) that is moved up and down by an air cylinder (44) at the work station (I).
5), at the work stations (V) and (V[), the presser <<
47), the working stations (I) (I[
In [)(VI), this is done by a pressing plate 48) fixed to the bearing part (6). The suppression plate (48) also serves as a support member for the air cylinders (44) and (46), and also serves as a support member for the air cylinders (44) and (46).
5) (47) forms a plane that is substantially continuous with the pressing body (48) when lowered. Each valve (40
) is arranged in a lagging position with respect to the arm (8) to which it belongs, so that the suppression plates (45, 47) are also in a position offset from the work station to which it belongs.

A parts supply device <50) is arranged at the work station (I). The component supply device (50) feeds the component supply carrier tape <51> one pitch at a time, and supplies the component (52) one by one to the vacuum suction means (30). The carrier tape (51) is a plastic chip sheet embossed to form a recess for storing one component (52), 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 parts supply device (50) has a large number of such carrier tapes (51) lined up in a direction perpendicular to the plane of the paper (Fig. 1), and by moving the entire carrier tape in the direction perpendicular to the plane of the paper, the carrier tape containing the necessary parts can be removed. (51) can be selected.

The work station (V) is an XY machine with a board (60) placed on it.
Place the table (61) (FIG. 11). A parts collection box (62) is placed at the work station (VI). The work station (Vl) is equipped with a component orientation determination device <63
). The attitude determination device (63) is composed of a fort sensor, and is placed in a position where the light beam passes directly under the correctly sucked parts.

A suction nozzle selection device (70) shown in FIG. 7.9 is arranged at the work station (■) or (■).

The main component of this device (70) is an elevator (71) supported by a fixed stick (5).The elevator (71) is equipped with four vertically sliding sliders (72), not shown. The movement of the cam is transmitted and vertical movement is given by Relais/< - (73). A selector gear (74) is horizontally supported at the bottom of the elevator (71) in such a way that it faces the center of rotation of the support means (1). The selector gear (74) is connected to the electric motor (75), which is fully supported by the elevator (71), via bevel gears (76) and (77), and when the elevator (71) descends, the driven gear (21) of the turret (20) ), and the driven gear (
21) to transmit the rotation of the electric motor (75). (78) is a stopper that determines the lower limit of descent of the elevator (71).

A lock bin (80) is attached to the upper surface of the arm (8). The lock pin (80) is held by a holter (81) fixed to the arm (8) so that it can slide parallel to the axis of the arm (8), and the spring (82) is held toward the turret (20).
is pressed. The end face of the turret (20) has four grooves (83) for receiving the tip of the lock bottle (80), one groove each behind the suction nozzles (22), (23), (24), and (25). form A U-shaped lever holder (84) is fixed to the rear end of the lock pin (80).
) receives one end of a bell crank type lever (85) supported by the fixed deck (5). The other end of the lever (85) is connected to the connecting rod (86) to the elevator (71).
are connected.

The work stations (I) and (V) have reciprocating bodies (90).
put When placing the centering or orientation device for the suction part at the work station (II) or (II[), the reciprocating body (90) will also be placed here. The reciprocating body (90) is the bearing part (9) of the fixed deck (5).
1) with a rod-shaped member fully supported by the sliding key (92)
The rotation is stopped and only the up and down movements are possible. At the lower end of the reciprocating body (90) is a slider (9).
12) is fixed, and a roller bracket (94) is fixed to the upper end. Bearing part (91
) and the pressing head (93), the reciprocating body (90) is pushed downward by a spring (95). (
96) is a camshaft, and (97) is a cam that rotates together with the camshaft (96) to provide movement to the reciprocating body (90).

A seesaw lever (100) connects the cam (97) and the reciprocating body <90>.The seesaw lever (100) is attached to a support base (101) with 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 of the deck in parallel with the arrangement direction of the seesaw lever (100). , supports a support stand (101) so as to be slidable in the horizontal direction. (10!,) is an electric motor supported on the fixed deck (5) by a bracket <106), and its output shaft (107) is connected to a feed screw (108) that screws into the support base (101). ing.

The seesaw lever (100) has a plurality of cam follower rollers (110) mounted on one side of the shaft (102) at regular intervals along the longitudinal direction.
10) is brought into contact with the lower surface of the cam (97). In the illustrated embodiment, a total of five cam follower rollers (110) are installed on one side of the seesaw lever (100).
2 pieces on the opposite side, arranged alternately on the camshaft (9
6) has a cam of the same shape (as seen in Figure 3).
97> are fixed in the same phase in correspondence with each row of cam follower rollers (110). The opposite end of the seesaw lever (100) lifts a roller (111) protruding from the roller bracket (94) of the reciprocating body (90).

The above device operates as follows. FIG. 11 shows the behavior of the vacuum suction means (30) at the work stations (I 2 ) (■) (V 2 ) (VI 2 ). Work station (I
), the vacuum suction means (30) arrives at the suction nozzle (2
2) Stop with the button facing down. At the time of arrival, the presser (45) is in the raised position, and the vacuum suction means (30) is not generating any suction force. Here, the elevating body (90) descends and pushes down the slider 9>, pressing the suction nozzle (22) against the component (52). This air cylinder (44)
-13 = The presser (45) is allowed to fall, the pulp (40) is opened, and the suction nozzle (22) suctions the part (52). The vacuum suction means (30) that has suctioned the part (52) is moved to the elevating body (9).
0), and by the intermittent rotation of the support (1), from the working station (I) to (I[), CI[)
While the pulp (40) is being transported from (III) to (■) to (IV), the actuator (43) of the pulp (40) continues to be pressed by the pressing plate (48), and the part (52) is attracted. is never interrupted. At the work station (IV), a posture determining device (63) inspects the posture of the component (52). If the suction is completed in a normal posture as shown in Figure 11,
Since the component (52) does not block the light beam of the photosensor, it can be concluded that there is no problem. Work station (I
The vacuum suction means (30) leaving V) arrive at the work station (V). At the time of arrival, the presser (47) is in the lowered position, and the vacuum suction means (30) continues to suction the part (52). The vacuum suction means (30) descends and the substrate (
When the component (52) is pressed against the adhesive applied to the pulp (60), the presser (47) rises to open the pulp (40) and release the suction. Note that if the component (52) is attracted in an abnormal position, the vacuum suction means (30) does not descend at the work station ° (V), and the presser (47) remains lowered until the work station (IV)
move to. Then, by raising the presser (47), the vacuum suction means (30) moves to the parts collection box (62).
) and move the part (52) to the work station (■).

The suction nozzle selection device (70) provided at the work station (■) to ■) 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. It's stuck inside. Lock Bin (80)
is engaged with the groove (83) as shown in Fig. 8, and firmly fixes the turret <20). Here, when it becomes necessary to change the suction nozzle (22>) to another one, the elevator (71) descends as shown in Fig. 9.
The selector gear (74) is engaged with the driven gear (21). As the elevator (71) descends, the lever (85) also rotates, causing the lock pin (80) to slide against the spring (82). This causes the lock pin (80) to slide into the groove (83).
), and the turret (20) becomes rotatable.

In this state, the electric motor (75) is driven to rotate the angle tatot (20) as much as necessary. When the elevator (71) is raised after changing the angle of the turret (20),
The lever (85) is restored to its old position and the lock bin (80)
engages with the groove (83) again to lock the turret (20).

As the cam (97) rotates and the seesaw lever (100) tilts downward to the right in FIG.
) pushes down the vacuum suction means (30) with the force of the spring (95). The seesaw lever (100) swings around the shaft (102>), but the position of the fulcrum changes depending on the thickness of the part.
), move the support stand (101) to the cam (97
), bring the cam follower roller (110) close to the shaft (102> into contact with the cam (97), and then press the lever (1
00) that supports the roller (111) is made to have a large amplitude. For this reason, the operating stroke of the reciprocating body (90) becomes large, and even though the part (52) is thin, the vacuum suction means (30) cannot reach the upper surface of the part (52), or the work station (V) does not allow the part (52) to reach its upper surface. 52
) can be pressed onto the substrate (60) with appropriate pressure. Next, thick parts (52') as shown in Fig.
When handling the support stand (101), the reciprocating body (90
) to bring the cam follower roller (110) farther from the shaft (102) into contact with the cam (97).

Then, the ratio of the distance between the force point, the fulcrum point, and the point of action changes, the operating stroke of the reciprocating body (90) becomes smaller, and the vacuum suction means (30) takes advantage of the deceleration curve of the cam (97) to move the part (52'). , and also place the component (52') on the board <
60〉. In this way, by selecting which cam follower roller (110) is brought into contact with the cam (97), the operating stroke of the reciprocating body (90) can be changed in stages. Note that if the seesaw lever (100) and electric motor (105) are attached to all work stations that require adjustment of the operating stroke of the reciprocating body (90), the seesaw lever (
100) may occur, but this can be resolved by shifting the arrangement up and down.

(G) Effects of the Invention According to the present invention, it is possible to expand and contract the lifting stroke given to the vacuum suction means by the cam in stages according to the thickness of the part, and to maintain the impact given to the part below a certain level. be. In addition, the stroke can be adjusted simply by changing the position of the seesaw lever, making it easy to control. Moreover, this device only needs to be placed at the work station where it is needed, without causing a significant increase in cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a vertical sectional view, Figs. 2 and 3 are top and side views of a portion of the seesaw lever, and Figs. 4 and 5 are different from Fig. 1. 6 is a top view of the support means, FIG. 7 is a side view of the suction nozzle selection device, and FIG. 8 is a top view of the vacuum suction means related to FIG. 7. Figure 9 is a side view of the suction nozzle selection device similar to Figure 7, but in a different operating state, Figure 10 is a top view of the vacuum suction means related to Figure 9, and Figure 11 is a view of each work station. FIG. 3 is an operation explanatory diagram showing in parallel the behavior of the vacuum adsorption means in FIG. (52) (52')... Parts, (60>... Board,
(50)...Component supply device, (1)...Support means,
(30)...Vacuum suction means, (90)...Reciprocating body, (97)...Cam, (100)...Seesaw lever, (101)...Support stand, (105)... ...Electric motor (position control means), (110)...Cam follower roller.

Claims (1)

[Scope of Claims] 1) A support means that rotates intermittently in a fixed direction above a board on which components are to be mounted and a component supply device, and a peripheral edge of this support means so that each member can slide vertically relative to the support means. a plurality of vacuum suction means supported by the substrate and always maintained at a height apart from the substrate or the component supply device, and provided at least at a location corresponding to the component supply device and a location corresponding to the substrate. , a plurality of reciprocating bodies that lower each of the vacuum suction means toward the target each time the vacuum adsorption means reaches the target; a cam that moves the reciprocating bodies; and a connection between the cams and the reciprocating bodies. a seesaw lever disposed in such a manner that the seesaw lever is arranged in a manner that An electronic component mounting apparatus comprising: a support base; and position control means for positioning the support base such that any one of the cam follower rollers comes into contact with the cam.